CN101990221A - Method for transmitting cell switching information and base stations thereof - Google Patents
Method for transmitting cell switching information and base stations thereof Download PDFInfo
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- CN101990221A CN101990221A CN2009101648896A CN200910164889A CN101990221A CN 101990221 A CN101990221 A CN 101990221A CN 2009101648896 A CN2009101648896 A CN 2009101648896A CN 200910164889 A CN200910164889 A CN 200910164889A CN 101990221 A CN101990221 A CN 101990221A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
Abstract
The invention discloses a method for transmitting cell switching information and base stations thereof, and relates to a wireless cellular communication system. The method comprises the following steps: a first base station transmits a switching parameter modifying and negotiating request to an adjoining second base station, wherein the switching parameter modifying and negotiating request comprises preset switching parameter allocation from a first cell which is administered by the first base station to a second cell which is administered by a second base station; and the second base station receives the switching parameter modifying and negotiating request, and returns a switching parameter modifying and negotiating failing message to the first base station when the second base station refuses the switching parameter allocation from the first cell to the second cell in the switching parameter modifying and negotiating request, wherein the switching parameter modifying and negotiating failing message comprises current switching information from the second cell to the first cell. Due to the technical scheme, the invention optimizes the specific switching parameter allocation, and simplifies the whole negotiating process.
Description
Technical field
The present invention relates to radio honeycomb communication system, particularly a kind of method and base station of transmitting cell handover information.
Background technology
Long Term Evolution LTE (Long Term Evolution) network is formed the network flattening by evolved universal terrestrial radio access network E-UTRAN (Evolved UTRAN) base station eNB (Evolved NodeB) and evolution packet switching center EPC (Evolved Packet Core).Wherein E-UTRAN comprises the set of the eNB that is connected by the S1 interface with EPC, can connect by X2 interface between the eNB.S1, X2 interface are logic interfacing.An EPC can manage one or more eNB, and an eNB also can be controlled by a plurality of EPC, and an eNB can manage one or more sub-districts.
MANET (SON, Self Organizing Network) is a kind of technology of carrying out network configuration and optimization automatically.The characteristics of this technology are the self-configuring self-optimizings, the application of this technology in LTE makes that LTE base station (eNB) can be according to the automatic configuration network parameter of certain measurement, and carry out Automatic Optimal according to network change, thus keep the network performance optimum, save lot of manpower and material resources simultaneously.
For the self-optimization of switching parameter of LTE system, need according to switching relevant measurement, optimize the sub-district gravity treatment and switch relevant parameter according to certain algorithm, according to the operation conditions of network to improve the performance of network.The switching here is meant the switching of LTE internal system and the switching between system, and the switching between system refers to the switching that universal terrestrial access network UTRAN (Universal Terrestrial RadioAccessNetwork) or global system for mobile communications GSM (Global System For MobileCommunication) or code division multiple access insert CDMA (Code Division Multiple Access) system.Equally, also can be used for the load balancing of minizone for the self-optimizing of handoff parameter, optimization by sub-district gravity treatment and handoff parameter can solve the inhomogeneous of traffic load, and make to realizing switching that load balancing is carried out and redirected number of times minimum, compare sub-district gravity treatment and handoff parameter static or that do not have self-optimizing, can also improve the capacity of system.
At present, when revising the handoff parameter of this sub-district, need to consider the handoff parameter configuration of relevant adjacent area, the modification meeting of some handoff parameter is to the switching behavior generation very big influence of UE to the adjacent area, for example, cell individual offsets CIO (Cell Individual Offset), frequency shift (FS) (frequency specific offset) and sluggish Hysteresis parameter can trigger UE to the too early of specific abutting subdistrict or all of its neighbor sub-district and the switching in evening excessively.Under a lot of scenes, the handoff parameter of a sub-district is made amendment, and what its relevant adjacent area also will respond makes amendment.
If the modification of the handoff parameter of a sub-district is only considered the handoff parameter configuration of this sub-district and the handoff parameter configuration of the abutting subdistrict of not considering to be correlated with, so just may produce inappropriate handoff parameter, thereby can cause table tennis to switch.The table tennis of UE between Cell b and Cell a that is shown in Figure 1 switches, because the inappropriate handoff parameter between Cell b and Cell a, and the UE switching of can between sub-district Cell b and Cell a, rattling.The mechanism that existing handoff parameter is consulted is used for the modification process of handoff parameter, when Cell a revises Cell a to the handoff parameter of Cell b switching, source base station under the Cell a must be held consultation with base station under the adjacency Cellb, if the base station, opposite end is agreed, then return and consult to confirm, if base station, opposite end refusal is then taken back a handoff parameter and is revised reference value and a suitable cause value.Source base station receives that handoff parameter negotiation acknowledge message is then with new handoff parameter configuration take-effective; Receive handoff parameter negotiation refuse information, then do not use new handoff parameter.Again initiate negotiations process next time.
As seen from the above, existing mode does not propose the settling mode that two base stations all need to revise parameter, and the opposite end is only returned a handoff parameter to revise reference value also be not enough when consulting failure.
Summary of the invention
Technical problem to be solved by this invention is a kind of method and base station of transmitting cell handover information to be provided, thereby to realize the self-optimization function of network.
In order to address the above problem, the invention discloses a kind of method of transmitting cell handover information, comprising:
First base station sends handoff parameter to adjacent second base station and revises the request of negotiation, and described handoff parameter is revised the handoff parameter configuration of carrying second sub-district of first sub-district first base station that pre-sets administered administering to second base station in the request of negotiation;
Described second base station receives described handoff parameter and revises the request of negotiation, when described second base station is refused described handoff parameter and is revised first sub-district in the request of negotiation to the handoff parameter configuration of second sub-district, return handoff parameter to described first base station and revise the negotiation failed message, described handoff parameter is revised and is consulted to carry the handover information of current second sub-district to first sub-district in the failed message.
Further, in the said method, after described second base station receives described handoff parameter modification negotiation request, when described second base station is accepted described handoff parameter and revised first sub-district in the request of negotiation to the handoff parameter configuration of second sub-district, return handoff parameter to described first base station and revise negotiate response message.
Wherein, described handoff parameter is revised in the negotiate response message and is carried the handover information of current second sub-district to first sub-district, described current second sub-district to the handover information of first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
New second sub-district of revising is to the handoff parameter configuration of first sub-district;
New second sub-district of revising is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district.
When described first base station receives that described handoff parameter is revised negotiate response message, revise the handoff parameter configuration of first sub-district to local first sub-district of preserving of the handoff parameter config update of second sub-district to second sub-district in the request of negotiation according to described handoff parameter, and preserve described handoff parameter and revise in the negotiate response message current second sub-district to the handover information of first sub-district.
Described handoff parameter revise consult current second sub-district entrained in the failed message to the handover information of first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
The stand-by period that negotiation is initiated is again revised to the handoff parameter configuration and the handoff parameter of first sub-district in the second unmodified sub-district;
The second unmodified sub-district is revised to handoff parameter configuration, the revisable scope of handoff parameter and the handoff parameter of first sub-district and is consulted the stand-by period of initiation again.
Receive when described handoff parameter is revised the negotiation failed message described first base station, optimization demand and handoff parameter according to this base station revise to consult current second sub-district determines whether to initiate again handoff parameter and revises negotiations process to the handover information of first sub-district in the failed message.
Request is consulted in described handoff parameter modification, handoff parameter revises negotiate response message and handoff parameter modification negotiation failed message is X1 interface message or S1 interface message.
Perhaps, described first base station sends described handoff parameter modification by mobile management unit to second base station and consults request, and described second base station sends described handoff parameter by mobile management unit to first base station and revises negotiate response message or handoff parameter modification negotiation failed message.
The invention also discloses a kind of base station of transmitting cell handover information, comprise receiver module, sending module and processing module, wherein:
Described receiver module is used to receive the handoff parameter modification negotiation request that the base station, opposite end sends, and described handoff parameter modification is consulted to ask to send to described processing module;
Described processing module, be used to receive described handoff parameter and revise the request of negotiation, if the described handoff parameter of refusal is revised the handoff parameter configuration of second sub-district of the base station, opposite end is administered in the request of negotiation first sub-district administering to this base station, then will carry current described second sub-district and send to described sending module to the handoff parameter modification negotiation failed message of the handover information of described first sub-district;
Described sending module is used to receive described handoff parameter and revises the negotiation failed message, and described handoff parameter modification negotiation failed message is sent to base station, described opposite end.
Further, in the above-mentioned base station, described processing module is revised the handoff parameter configuration of first sub-district described in the request of negotiation to second sub-district if accept described handoff parameter, then handoff parameter is revised negotiate response message and is sent to described sending module;
Described sending module also is used to receive described handoff parameter and revises negotiate response message, and described handoff parameter modification negotiate response message is sent to the base station, opposite end.
Wherein, described processing module also is used for revising negotiate response message at described handoff parameter and carries the handover information of current described second sub-district to described first sub-district, current second sub-district to the handover information of first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
New second sub-district of revising is to the handoff parameter configuration of first sub-district;
New second sub-district of revising is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district.
Described processing module, described handoff parameter revise consult current described second sub-district of carrying in the failed message to the handover information of described first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
The stand-by period that negotiation is initiated is again revised to the handoff parameter configuration and the handoff parameter of first sub-district in the second unmodified sub-district;
The second unmodified sub-district is revised to handoff parameter configuration, the revisable scope of handoff parameter and the handoff parameter of first sub-district and is consulted the stand-by period of initiation again.
Described processing module, also be used to upgrade the handoff parameter of first sub-district of second sub-district administered this base station being administered to the base station, opposite end, and will carry described second sub-district and consult to ask to send to described sending module to the handoff parameter modification of the handoff parameter configuration of described first sub-district, and be used to receive handoff parameter that described sending module sends and revise and consult failed message and handoff parameter is revised negotiate response message, and preserve described handoff parameter and revise and consult in the failed message current described first sub-district to the handover information of described second sub-district;
Described sending module is used to receive described handoff parameter and revises the request of negotiation, and described handoff parameter modification negotiation request is sent to the base station, opposite end;
Described receiver module, be used to receive the handoff parameter modification of returning the base station, opposite end and consult failed message and handoff parameter modification negotiate response message, and described handoff parameter modification negotiation failed message and handoff parameter modification negotiate response message are sent to described processing module.
Adopt technical solution of the present invention, can concrete handoff parameter configuration be optimized, simplify the process of whole negotiation, reduce waste of network resources, improve the performance of network, thereby realize the self-optimization function of network.
Description of drawings
Fig. 1 is the schematic diagram that UE rattles between Cell b and Cell a and switches in the prior art;
Fig. 2 is the architecture of base station schematic diagram of transmission cell handover information in the present embodiment;
Fig. 3 is the flow chart of base station transmits cell handover information shown in Figure 2;
Fig. 4 revises for handoff parameter in the present embodiment and consults successfully and only to revise sub-district 1 flow chart that 2 handoff parameter disposes to the sub-district;
Fig. 5 for handoff parameter in the present embodiment revise consult success and revised sub-district 1 to the sub-district 2 handoff parameter configuration and sub-district 2 flow chart that 1 handoff parameter disposes to the sub-district;
Fig. 6 is that handoff parameter is revised the flow chart of consulting failure in the present embodiment;
Fig. 7 revises and consults successfully and only to revise sub-district 1 flow chart that 2 handoff parameter disposes to the sub-district for carrying out handoff parameter by the configuration message transfer in the present embodiment;
Fig. 8 in the present embodiment by the configuration message transfer carry out handoff parameter revise consult success and revised sub-district 1 to the sub-district 2 handoff parameter configuration and sub-district 2 flow chart that 1 handoff parameter disposes to the sub-district;
Fig. 9 revises the flow chart of consulting failure for carrying out handoff parameter by the configuration message transfer in the present embodiment.
Embodiment
Main design of the present invention is, when handoff parameter need be upgraded in this sub-district, carrying out handoff parameter with abutting subdistrict consults, and in negotiations process mutual both sides' cell handover information (as handoff parameter configuration and the revisable scope of handoff parameter), thereby optimized the process of consulting, obtained suitable handoff parameter configuration (handover parameter settings).
Particularly, consider that it is to realize by the interacting message between the base station that handoff parameter is revised the process of consulting, under the situation that has X2 interface between the base station, can come mutual by X2 interface message; Do not exist between the base station under the situation of X2 interface, then can come mutual by the S1 interface message.The message that handoff parameter is revised negotiations process can be the independent message of X2 interface, is respectively handoff parameter and revises negotiation request message, handoff parameter modification negotiate response message and handoff parameter modification negotiation failed message.At the S1 interface, the message that handoff parameter is revised negotiations process can be independent message also, is respectively handoff parameter and revises negotiation request message, handoff parameter modification negotiate response message and handoff parameter modification negotiation failed message.Also can transmit the content of these three message by base station configuration message transfer eNB CONFIGURATION TRANSFER and mobile management unit configuration message transfer MME CONFIGURATION TRANSFER.
Below in conjunction with drawings and the specific embodiments technical solution of the present invention is described in further detail.
A kind of base station of transmitting cell handover information as shown in Figure 2, comprises receiver module, sending module and processing module.Introduce the function of each module below.
Receiver module, be used to receive handoff parameter that the base station, opposite end sends and revise the request of negotiation, handoff parameter and revise and consult failed message and handoff parameter is revised negotiate response message, and the handoff parameter that is received is revised the request of negotiation, handoff parameter revise and consult failed message and handoff parameter and revise negotiate response message and send to processing module respectively;
Processing module, be used to receive handoff parameter and revise the request of negotiation, the handoff parameter configuration of the sub-district 2 that the sub-district 1 that the base station, opposite end was administered during if the refusal handoff parameter was revised and consulted to ask is administered to this base station, the handoff parameter that then will carry current area 2 handover information of 1 to the sub-district is revised and is consulted failed message and send to sending module, revise to consult sub-district 1 in the request 2 handoff parameter disposes to the sub-district if accept handoff parameter, then handoff parameter is revised negotiate response message and sent to sending module;
Processing module, also be used to upgrade sub-district 2 handoff parameter configuration of 1 to the sub-district, and the handoff parameter of the sub-district 2 that will carry modification handoff parameter configuration of 1 to the sub-district is revised the request of negotiation and is sent to sending module, and be used to receive that handoff parameter revise to be consulted failed message and handoff parameter is revised negotiate response message, and preserve handoff parameter and revise and consult in the failed message current area 1 to the handover information of sub-district 2.
Wherein, the processing module current area 2 of in handoff parameter revise to be consulted failed message, carrying to the sub-district 1 handover information be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
The stand-by period that negotiation is initiated is again revised to the handoff parameter configuration and the handoff parameter of first sub-district in the second unmodified sub-district;
The second unmodified sub-district is revised to handoff parameter configuration, the revisable scope of handoff parameter and the handoff parameter of first sub-district and is consulted the stand-by period of initiation again.
In other embodiments, processing module can also handoff parameter revise carry in the negotiate response message current area 2 to the sub-district 1 handover information, current area 2 to the sub-district 1 handover information be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
New second sub-district of revising is to the handoff parameter configuration of first sub-district;
New second sub-district of revising is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district.
Sending module, the handoff parameter that is used for the receiving processing module transmission is revised the negotiation failed message, handoff parameter is revised negotiate response message and handoff parameter modification negotiation request, and failed message, handoff parameter modification negotiate response message and handoff parameter modification is consulted in the handoff parameter modification that is received consulted to ask to send to respectively the base station, opposite end.
Process below in conjunction with the above-mentioned base station transmits cell handover information of case introduction.
For example, sub-district 1 and sub-district 2 are abutting subdistricts, and sub-district 1 belongs to base station 1, and sub-district 2 belongs to base station 2, and in the LTE system, base station 1 is initiated handoff parameter to base station 2 and revised negotiations process, as shown in Figure 3, may further comprise the steps:
Step 301: base station 1 sends handoff parameters to base station 2 and revises negotiation request message, carries new sub-district 1 handoff parameter configuration of 2 to the sub-district (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) in this message;
In this step, the modification negotiations process of sub-district 1 handoff parameter of 2 sub-districts of administering 2 that base station 1 is administered (being that handoff parameter modification negotiation request message is initiated in base station 1) to the base station, can be by certain algorithm triggers, such as carrying out handoff parameter modification that load balancing optimization or mobility optimization causes etc.
Step 302: base station 2 receives above-mentioned handoff parameter and revises negotiation request message, read wherein new sub-district 12 handoff parameter configuration to the sub-district, and judge whether to accept new sub-district 1 handoff parameter configuration of 2 to the sub-district, if, then enter step 303 (a), otherwise enter step 303 (b);
In this step, base station 2 judges whether to accept new sub-district 1 handoff parameter configuration of 2 to the sub-district according to prior art, wherein, the rule that prior art judges whether to accept new sub-district 1 handoff parameter configuration of 2 to the sub-district refers to, the handoff parameter configuration that sub-district 1 is arrived to the handoff parameter configuration and the sub-district 2 of sub-district 2 in sub-district 1, need certain surplus between the border of two switchings of Chan Shenging geographically, promptly to satisfy certain restricting relation between the two cover handoff parameters, this restricting relation can be OAM (OperationsAnd Maintenance) regulation, and perhaps both sides arrange.
Step 303 (a): base station 2 is returned handoff parameter to base station 1 and is revised negotiate response, consults successfully with expression, enters step 304 (a);
In this step, base station 2 the handoff parameter that returns revise can also carry in the negotiate response current area 2 to the sub-district 1 handover information (can be used as the base station and revise sub-district 1 reference that 2 handoff parameter disposes to the sub-district 1 next time), perhaps do not carry any sub-district 2 to the sub-district 1 handover information, wherein, current area 2 to the sub-district 1 handover information be following any:
(new sub-district 1 is being accepted in the handoff parameter configuration of sub-district 2 in base station 2 to the handoff parameter configuration of sub-district 1 in new sub-district 2, also may revise sub-district 21 handoff parameter configuration to the sub-district, 1 handoff parameter configuration is new sub-district 21 handoff parameter disposes to the sub-district to the sub-district in the sub-district 2 of being revised);
Step 303 (b): base station 2 is returned handoff parameter to base station 1 and revise to be consulted failed message, carry in this message current area 2 to the sub-district 1 handover information, enter step 304 (b);
In this step, base station 2 is revised at handoff parameter and is consulted the handover information of current area entrained in the failed message 2 to sub-district 1, it can be 1 the handoff parameter configuration of unmodified sub-district 2 to the sub-district, or unmodified sub-district 2 is to the handoff parameter configuration and the revisable scope of handoff parameter of sub-district 1, and the revisable scope of handoff parameter can be provided by OAM (Operations And Maintenance) configuration or other optimization scene.Also have among some embodiment, handoff parameter is revised and is consulted current area 2 entrained in the failed message 1 handover information can also comprise that handoff parameter is revised and consults the stand-by period of initiation again to the sub-district.
Step 304 (a): base station 1 receives handoff parameter and revises negotiate response message, 2 handoff parameter disposes to the sub-district to upgrade local sub-district 1 of being preserved, and use new sub-district 12 handoff parameter configuration (i.e. sub-district 1 of Geng Xining 2 handoff parameter disposes to the sub-district), process ends to the sub-district;
In this step, revise to carry sub-district 2 in the negotiate response message to the sub-district during 1 handoff parameter configuration when handoff parameter, sub-district 2 is also preserved in base station 1, and 1 handoff parameter disposes to the sub-district;
Step 304 (b): base station 1 receives handoff parameter and revises the negotiation failed message, can revise the handoff parameter configuration of sub-district 2 unmodified in the negotiation failed message to sub-district 1 according to the optimization demand and the handoff parameter of this base station, whether decision is initiated handoff parameter again and is revised negotiations process;
In other embodiments, in revise consulting failed message, also carries handoff parameter sub-district 2 to the sub-district during 1 the revisable scope of handoff parameter, base station 1 is revised according to optimization demand, the handoff parameter of this base station and is consulted handoff parameter configuration and this handoff parameter revisable scope of sub-district unmodified in the failed message 2 to sub-district 1, and whether decision is initiated handoff parameter again and revised negotiations process.Also have among some embodiment, when also carrying handoff parameter revising the stand-by period of consulting to initiate again in handoff parameter revise to be consulted failed message, base station 1 must could be initiated 2 the handoff parameter modification negotiations process to the sub-district of sub-district 1 next time after surpassing waiting time at least arriving.
In above-mentioned flow process, handoff parameter in the handoff parameter modification negotiations process is revised negotiation request message, handoff parameter revises negotiate response message and handoff parameter modification negotiation failed message can be the independent message of X2 interface, or S1 interface independent message, perhaps dispose the content that message transfer MMECONFIGURATION TRANSFER transmits these three message by base station configuration message transfer eNBCONFIGURATION TRANSFER and mobile management unit.
Below in conjunction with Fig. 4, introduce handoff parameter and revise and to consult successfully, and only revise sub-district 1 process that 2 handoff parameter disposes to the sub-district, may further comprise the steps:
Step 401: base station 1 is according to the optimization demand of switching robustness or the optimization demand of load balancing, the handoff parameter configuration (promptly needing to upgrade the handoff parameter configuration of 2 sub-districts of administering 2 to the base station, sub-district 1) of 2 sub-districts of administering 2 to the base station, sub-district 1 is revised in decision, base station 1 generates the new handoff parameter configuration of a cover, and promptly new sub-district 1 is to the handoff parameter configuration of sub-district 2;
Step 402: base station 1 is revised negotiation request message and is initiated handoff parameters and revise negotiations processes by send handoff parameters to base station 2, revises at handoff parameter and carries new sub-district 1 handoff parameter configuration of 2 to the sub-district (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) in the negotiation request message;
Step 403: receive when handoff parameter is revised negotiation request message base station 2,2 handoff parameter disposes to the sub-district can to accept new sub-district 1 that base station 1 request revises according to certain rule judgment, and sub-district 2 to the sub-district configuration of 1 handoff parameter need not revise, return handoff parameter then for base station 1 and revise negotiate response message, handoff parameter is revised and is carried unmodified sub-district 2 in the negotiate response message 1 handoff parameter disposes to the sub-district;
In other embodiments, base station 2 is revised at handoff parameter and can be carried unmodified sub-district 2 in the negotiate response message 1 handoff parameter disposes and the revisable scope of handoff parameter to the sub-district.
Step 404: handoff parameter modification negotiate response message is received in base station 1, upgrade of the handoff parameter configuration of the local sub-district of preserving 1 to sub-district 2, and use new sub-district 12 handoff parameter configuration (i.e. the sub-district 1 of Geng Xining handoff parameter configuration of 2), and preserve handoff parameter and revise the information that the handoff parameter that sub-district 2 in the negotiate response message arrives sub-district 1 disposes to the sub-district to the sub-district.
In other embodiments, base station 2 handoff parameter of returning for base station 1 is revised and also can not carried sub-district 2 information that 1 handoff parameter disposes to the sub-district in the negotiate response message.
Below in conjunction with Fig. 5 introduction, handoff parameter is revised and to be consulted successfully, and 2 handoff parameter disposes and sub-district 2 process that 1 handoff parameter disposes to the sub-district to the sub-district to have revised sub-district 1 simultaneously, may further comprise the steps:
Step 501: base station 1 is according to the optimization demand of switching robustness or the optimization demand of load balancing, and the handoff parameter configuration of sub-district 1 to the sub-district of administering 2, base station 2 revised in decision, and base station 1 generates the new handoff parameter configuration of a cover;
Step 502: base station 1 is revised negotiation request message and is initiated handoff parameters and revise negotiations processes by send handoff parameters to base station 2, revises at handoff parameter and carries new sub-district 1 handoff parameter configuration of 2 to the sub-district (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) in the negotiation request message;
Step 503: handoff parameter modification negotiation request message is received in base station 2, according to certain rule, judgement is being revised sub-district 2 under the situation of the handoff parameter configuration of sub-district 1,2 handoff parameter disposes to the sub-district can to accept new sub-district 1 that base station 1 request revises, then generate the new sub-district 2 of cover handoff parameter configuration of 1 (1 handoff parameter disposes to the sub-district in the sub-district 2 of promptly having revised) to the sub-district, and return handoff parameter for base station 1 and revise negotiate response message, revise at handoff parameter and to carry new sub-district 2 in the negotiate response message 1 handoff parameter disposes to the sub-district, simultaneously, the handoff parameter configuration of new sub-district 2 to sub-district 1 used in base station 2;
In other embodiments, base station 2 is revised at handoff parameter and can be carried new sub-district 2 in the negotiate response message 1 handoff parameter disposes and the revisable scope of handoff parameter to the sub-district.
Step 504: handoff parameter modification negotiate response message is received in base station 1,2 handoff parameter disposes to the sub-district to upgrade local sub-district 1 of being preserved, and use new sub-district 12 handoff parameter configuration, and preserve handoff parameter and revise the information of sub-district new in the negotiate response message 2 to the handoff parameter configuration of sub-district 1 to the sub-district.
In other embodiments, handoff parameter is revised and to be carried new sub-district 2 in the negotiate response message to the sub-district when 1 handoff parameter configuration and the revisable scope of handoff parameter, and information and the revisable scope of handoff parameter that the handoff parameter that arrives sub-district 1 in new sub-district 2 disposes preserved in base station 1.
Below in conjunction with Fig. 6 introduction, handoff parameter is revised and is consulted failure procedure, may further comprise the steps:
Step 601: base station 1 is according to the optimization demand of switching robustness or the optimization demand of load balancing, and the handoff parameter configuration of sub-district 1 to the sub-district of administering 2, base station 2 revised in decision, and base station 1 generates the new handoff parameter configuration of a cover;
Step 602: base station 1 is revised negotiation request message and is initiated handoff parameters and revise negotiations processes by send handoff parameters to base station 2, revises at handoff parameter and carries new sub-district 1 handoff parameter configuration of 2 to the sub-district (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) in the negotiation request message;
Step 603: handoff parameter modification negotiation request message is received in base station 2, according to certain rule, judgement can not be accepted new sub-district 12 handoff parameter configuration to the sub-district, return handoff parameter then for base station 1 and revise and consult failed message, and revise at handoff parameter and to consult to carry in the failed message unmodified sub-district 21 handoff parameter disposes to the sub-district;
Step 604: handoff parameter modification negotiation failed message is received in base station 1, optimization demand and handoff parameter according to this base station are revised the handoff parameter configuration of sub-district 2 unmodified in the negotiation failed message to sub-district 1, and whether decision is initiated handoff parameter again and revised negotiations process.
After above-mentioned negotiations process finished, base station 1 and base station 2 were all used unmodified sub-district 11 handoff parameter are disposed to the sub-district 2 handoff parameter configuration and sub-district 2 to the sub-district.
In other embodiments, base station 2 is revised at handoff parameter and is consulted in the failed message except carrying unmodified sub-district 2 to the handoff parameter configuration of sub-district 1, can also carry a sub-district 2 to the sub-district 1 the revisable scope of handoff parameter, the revisable scope of this handoff parameter can be provided by OAM configuration or other optimization scene, at this moment, handoff parameter configuration and this handoff parameter revisable scope of sub-district 2 unmodified in the negotiation failed message to sub-district 1 revised according to the optimization demand and the handoff parameter of this base station in base station 1, and whether decision is initiated handoff parameter again and revised negotiations process.
Also have among some embodiment, base station 2 is revised at handoff parameter and is consulted can also carry in the failed message stand-by period that handoff parameter modification negotiation is initiated again, at this moment, base station 1 must be after arriving or surpassing this stand-by period, could initiate 2 the handoff parameter modification negotiations process to the sub-district of sub-district 1 next time.
Below in conjunction with Fig. 7 introduction, carry out handoff parameter by the configuration message transfer and revise and to consult successfully, and only revise sub-district 1 process that 2 handoff parameter disposes to the sub-district, comprise the steps:
Step 701: base station 1 is according to the optimization demand of switching robustness or the optimization demand of load balancing, and the handoff parameter configuration of sub-district 1 to the sub-district of administering 2, base station 2 revised in decision, and base station 1 generates the new handoff parameter configuration of a cover;
Step 702: base station 1 sends base station configuration message transfer eNBCONFIGURATION TRANSFER to mobile management unit (MME), MME sends mobile management unit configuration message transfer MME CONFIGURATION TRANSFER to base station 2 again and initiates handoff parameter modification negotiations process, in base station configuration message transfer and mobile management unit configuration message transfer, contain handoff parameter and revise and consult request content, and carry new sub-district 1 handoff parameter configuration of 2 (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) to the sub-district;
Step 703: after base station 2 receives that by MME the handoff parameter of base station 1 is revised the request of negotiation, according to certain rule, judgement can be accepted new sub-district 1 that base station 1 request revises, and 2 handoff parameter disposes to the sub-district, and sub-district 2 to the sub-district configuration of 1 handoff parameter need not revise, return handoff parameter then for base station 1 and revise negotiate response, revise at handoff parameter and contain unmodified sub-district 2 in the negotiate response 1 handoff parameter disposes to the sub-district;
In this step, base station 2 sends the base station configuration message transfer to MME, and MME sends mobile management unit configuration message transfer to base station 1 then, contains handoff parameter and revise the negotiate response content in base station configuration message transfer and mobile management unit configuration message transfer.
Step 704: the handoff parameter modification negotiate response content that send by MME base station 2 is received in base station 1,2 handoff parameter disposes to the sub-district to upgrade local sub-district 1 of being preserved, use the handoff parameter configuration of new sub-district 1, and the information of the handoff parameter configuration of sub-district 1 is arrived in sub-district 2 in the preservation handoff parameter modification negotiate response content to sub-district 2.
In other embodiments, base station 2 is returned handoff parameter for base station 1 to revise and can not carry sub-district 2 information that 1 handoff parameter disposes to the sub-district in the negotiate response content.
Also have among some embodiment, base station 2 is revised at handoff parameter and can be carried unmodified sub-district 2 in the negotiate response message 1 handoff parameter disposes and the revisable scope of handoff parameter to the sub-district, at this moment, the handoff parameter configuration of new sub-district 1 to sub-district 2 used in base station 1, and preserves handoff parameter and revise in the negotiate response content sub-district 2 to the handoff parameter configuration and the revisable scope of handoff parameter of sub-district 1.
Below in conjunction with Fig. 8, introduce and to carry out handoff parameter by the configuration message transfer and revise and consults successfully, 2 handoff parameter disposes and sub-district 2 process that 1 handoff parameter disposes to the sub-district to the sub-district to have revised sub-district 1 simultaneously, may further comprise the steps:
Step 801: base station 1 is according to the optimization demand of switching robustness or the optimization demand of load balancing, and the handoff parameter configuration of sub-district 1 to the sub-district of administering 2, base station 2 revised in decision, and base station 1 generates the new handoff parameter configuration of a cover;
Step 802: base station 1 sends base station configuration message transfer eNBCONFIGURATION TRANSFER to mobile management unit MME, MME sends mobile management unit configuration message transfer MME CONFIGURATION TRANSFER to base station 2 again and initiates handoff parameter modification negotiations process, in base station configuration message transfer and mobile management unit configuration message transfer, contain to revise and consult request content, and carry new sub-district 1 handoff parameter configuration of 2 (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) to the sub-district at handoff parameter;
Step 803: after base station 2 receives that by MME the handoff parameter of base station 1 is revised the request of negotiation, according to certain rule, judgement is being revised sub-district 2 under the situation of the handoff parameter configuration of sub-district 1,2 handoff parameter disposes to the sub-district can to accept new sub-district 1 that base station 1 request revises, 1 handoff parameter disposes to the sub-district then to generate the new sub-district 2 of a cover, return handoff parameter for base station 1 and revise negotiate response, contain new sub-district 2 handoff parameter configuration of 1 to the sub-district in handoff parameter is revised negotiate response, base station 2 uses new sub-district 2 to dispose to the handoff parameter of sub-district 1;
In this step, base station 2 sends the base station configuration message transfer to MME, and MME sends mobile management unit configuration message transfer to base station 1 then, contains handoff parameter and revise the negotiate response content in base station configuration message transfer and mobile management unit configuration message transfer.
Step 804: the handoff parameter modification negotiate response that send by MME base station 2 is received in base station 1,2 handoff parameter disposes to the sub-district to upgrade local sub-district 1 of being preserved, use the handoff parameter configuration of new sub-district 1, and preserve handoff parameter and revise the information of sub-district new in the negotiate response 2 to the handoff parameter configuration of sub-district 1 to sub-district 2.
In other embodiments, base station 2 is revised at handoff parameter and can be carried new sub-district 2 in the negotiate response message 1 handoff parameter disposes and the revisable scope of handoff parameter to the sub-district, at this moment, base station 1 is preserved handoff parameter and is revised handoff parameter configuration and the handoff parameter revisable scope of sub-district new in the negotiate response content 2 to sub-district 1.
In other embodiments, base station 2 is returned handoff parameter for base station 1 to revise and can not carry sub-district 2 information that 1 handoff parameter disposes to the sub-district in the negotiate response content.
Following Fig. 9 introduces by the configuration message transfer and carries out the process that handoff parameter is revised the negotiation failure, comprises the steps:
Step 901: base station 1 is according to the optimization demand of switching robustness or the optimization demand of load balancing, and the handoff parameter configuration of sub-district 1 to the sub-district of administering 2, base station 2 revised in decision, and base station 1 generates the new handoff parameter configuration of a cover;
Step 902: base station 1 sends base station configuration message transfer eNBCONFIGURATION TRANSFER to mobile management unit MME, MME sends mobile management unit configuration message transfer MME CONFIGURATION TRANSFER to base station 2 again and initiates handoff parameter modification negotiations process, in base station configuration message transfer and mobile management unit configuration message transfer, contain to revise and consult request content, revise at handoff parameter and carry new sub-district 1 handoff parameter configuration of 2 (2 handoff parameter disposes to the sub-district in the sub-district 1 that promptly pre-sets) in the request of negotiation to the sub-district at handoff parameter;
Step 903: after base station 2 receives that by MME the handoff parameter of base station 1 is revised the request of negotiation, according to certain rule, judgement can not be accepted new sub-district 12 handoff parameter configuration to the sub-district, return handoff parameter then for base station 1 and revise and consult the failure content, and revise at handoff parameter and to consult to carry in the failure content unmodified sub-district 21 handoff parameter disposes to the sub-district;
In this step, base station 2 sends the base station configuration message transfer to MME, and MME sends mobile management unit configuration message transfer to base station 1 then, contains the handoff parameter modification and consult the failure content in base station configuration message transfer and mobile management unit configuration message transfer.
Step 904: the handoff parameter modification negotiation failure content that send by MME base station 2 is received in base station 1, optimization demand and handoff parameter according to this base station are revised the handoff parameter configuration of sub-district 2 unmodified in the negotiation failure content to sub-district 1, and whether decision initiates handoff parameter modification negotiations process again.
After above-mentioned negotiations process finished, base station 1 and base station 2 were all used unmodified sub-district 11 handoff parameter are disposed to the sub-district 2 handoff parameter configuration and sub-district 2 to the sub-district.
In other embodiments, base station 2 is revised at handoff parameter and is consulted in the failure content except carrying unmodified sub-district 2 to the handoff parameter configuration of sub-district 1, can also carry a sub-district 2 to the sub-district 1 the revisable scope of handoff parameter, the revisable scope of this handoff parameter can be provided by OAM configuration or other optimization scene, at this moment, handoff parameter configuration and this handoff parameter revisable scope of sub-district 2 unmodified in the negotiation failure content to sub-district 1 revised according to the optimization demand and the handoff parameter of this base station in base station 1, and whether decision initiates handoff parameter modification negotiations process again.
Also have among some embodiment, base station 2 can be revised at handoff parameter and be consulted to carry in the failure content stand-by period that handoff parameter modification negotiation is initiated again, at this moment, base station 1 must be after arriving or surpassing waiting time, could initiate 2 the handoff parameter modification negotiations process to the sub-district of sub-district 1 next time.
From the foregoing description as can be seen, revising reference value with the handoff parameter that handoff parameter in the prior art consults to return under the failure scenarios compares, technical solution of the present invention is in the handoff parameter negotiations process, can return the handoff parameter configuration of base station, opposite end to source base station, perhaps return the handoff parameter configuration and the revisable scope of base station, opposite end, as the reference of next negotiations process initiation.Like this, just concrete handoff parameter configuration is optimized, simplified the process of whole negotiation, reduced waste of network resources, improved the performance of network, thereby realized the self-optimization function of network.
Certainly; the present invention also can have numerous embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes or variation according to the present invention; in every case any modification of being done within the spirit and principles in the present invention, be equal to replacements, improvement, all should be included within the protection range of the appended claim of the present invention.
Claims (13)
1. a method of transmitting cell handover information is characterized in that, this method comprises:
First base station sends handoff parameter to adjacent second base station and revises the request of negotiation, and described handoff parameter is revised the handoff parameter configuration of carrying second sub-district of first sub-district first base station that pre-sets administered administering to second base station in the request of negotiation;
Described second base station receives described handoff parameter and revises the request of negotiation, when described second base station is refused described handoff parameter and is revised first sub-district in the request of negotiation to the handoff parameter configuration of second sub-district, return handoff parameter to described first base station and revise the negotiation failed message, described handoff parameter is revised and is consulted to carry the handover information of current second sub-district to first sub-district in the failed message.
2. the method for claim 1 is characterized in that,
After described second base station receives described handoff parameter modification negotiation request, when described second base station is accepted described handoff parameter and revised first sub-district in the request of negotiation to the handoff parameter configuration of second sub-district, return handoff parameter to described first base station and revise negotiate response message.
3. method as claimed in claim 2 is characterized in that,
Described handoff parameter is revised in the negotiate response message and is carried the handover information of current second sub-district to first sub-district, described current second sub-district to the handover information of first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
New second sub-district of revising is to the handoff parameter configuration of first sub-district;
New second sub-district of revising is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district.
4. method as claimed in claim 3 is characterized in that,
When described first base station receives that described handoff parameter is revised negotiate response message, revise the handoff parameter configuration of first sub-district to local first sub-district of preserving of the handoff parameter config update of second sub-district to second sub-district in the request of negotiation according to described handoff parameter, and preserve described handoff parameter and revise in the negotiate response message current second sub-district to the handover information of first sub-district.
5. as claim 1,2 or 3 described methods, it is characterized in that,
Described handoff parameter revise consult current second sub-district entrained in the failed message to the handover information of first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
The stand-by period that negotiation is initiated is again revised to the handoff parameter configuration and the handoff parameter of first sub-district in the second unmodified sub-district;
The second unmodified sub-district is revised to handoff parameter configuration, the revisable scope of handoff parameter and the handoff parameter of first sub-district and is consulted the stand-by period of initiation again.
6. method as claimed in claim 5 is characterized in that,
Receive when described handoff parameter is revised the negotiation failed message described first base station, optimization demand and handoff parameter according to this base station revise to consult current second sub-district determines whether to initiate again handoff parameter and revises negotiations process to the handover information of first sub-district in the failed message.
7. method as claimed in claim 5 is characterized in that,
Request is consulted in described handoff parameter modification, handoff parameter revises negotiate response message and handoff parameter modification negotiation failed message is X1 interface message or S 1 interface message.
8. method as claimed in claim 5 is characterized in that,
Described first base station sends described handoff parameter modification by mobile management unit to second base station and consults request, and described second base station sends described handoff parameter by mobile management unit to first base station and revises negotiate response message or handoff parameter modification negotiation failed message.
9. a base station of transmitting cell handover information is characterized in that, this base station comprises receiver module, sending module and processing module, wherein:
Described receiver module is used to receive the handoff parameter modification negotiation request that the base station, opposite end sends, and described handoff parameter modification is consulted to ask to send to described processing module;
Described processing module, be used to receive described handoff parameter and revise the request of negotiation, if the described handoff parameter of refusal is revised the handoff parameter configuration of second sub-district of the base station, opposite end is administered in the request of negotiation first sub-district administering to this base station, then will carry current described second sub-district and send to described sending module to the handoff parameter modification negotiation failed message of the handover information of described first sub-district;
Described sending module is used to receive described handoff parameter and revises the negotiation failed message, and described handoff parameter modification negotiation failed message is sent to base station, described opposite end.
10. base station as claimed in claim 9 is characterized in that,
Described processing module is revised the handoff parameter configuration of first sub-district described in the request of negotiation to second sub-district if accept described handoff parameter, then handoff parameter is revised negotiate response message and is sent to described sending module;
Described sending module also is used to receive described handoff parameter and revises negotiate response message, and described handoff parameter modification negotiate response message is sent to the base station, opposite end.
11. base station as claimed in claim 10 is characterized in that,
Described processing module also is used for revising negotiate response message at described handoff parameter and carries the handover information of current described second sub-district to described first sub-district, current second sub-district to the handover information of first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
New second sub-district of revising is to the handoff parameter configuration of first sub-district;
New second sub-district of revising is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district.
12. as claim 9,10 or 11 described base stations, it is characterized in that,
Described processing module, described handoff parameter revise consult current described second sub-district of carrying in the failed message to the handover information of described first sub-district be following any:
The second unmodified sub-district is to the handoff parameter configuration of first sub-district;
The second unmodified sub-district is to the handoff parameter configuration and the revisable scope of handoff parameter of first sub-district;
The stand-by period that negotiation is initiated is again revised to the handoff parameter configuration and the handoff parameter of first sub-district in the second unmodified sub-district;
The second unmodified sub-district is revised to handoff parameter configuration, the revisable scope of handoff parameter and the handoff parameter of first sub-district and is consulted the stand-by period of initiation again.
13. as claim 9,10 or 11 described base stations, it is characterized in that,
Described processing module, also be used to upgrade the handoff parameter of first sub-district of second sub-district administered this base station being administered to the base station, opposite end, and will carry described second sub-district and consult to ask to send to described sending module to the handoff parameter modification of the handoff parameter configuration of described first sub-district, and be used to receive handoff parameter that described sending module sends and revise and consult failed message and handoff parameter is revised negotiate response message, and preserve described handoff parameter and revise and consult in the failed message current described first sub-district to the handover information of described second sub-district;
Described sending module is used to receive described handoff parameter and revises the request of negotiation, and described handoff parameter modification negotiation request is sent to the base station, opposite end;
Described receiver module, be used to receive the handoff parameter modification of returning the base station, opposite end and consult failed message and handoff parameter modification negotiate response message, and described handoff parameter modification negotiation failed message and handoff parameter modification negotiate response message are sent to described processing module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101648896A CN101990221A (en) | 2009-08-07 | 2009-08-07 | Method for transmitting cell switching information and base stations thereof |
| PCT/CN2010/075734 WO2011015144A1 (en) | 2009-08-07 | 2010-08-05 | Method and evolved nodeb for transmitting cell handover information |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101648896A CN101990221A (en) | 2009-08-07 | 2009-08-07 | Method for transmitting cell switching information and base stations thereof |
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| CN2009101648896A Pending CN101990221A (en) | 2009-08-07 | 2009-08-07 | Method for transmitting cell switching information and base stations thereof |
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| CN (1) | CN101990221A (en) |
| WO (1) | WO2011015144A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102045780A (en) * | 2009-10-09 | 2011-05-04 | 中兴通讯股份有限公司 | Method and system for negotiating mobility parameter in LTE mobile communication system |
| CN102316485A (en) * | 2011-09-14 | 2012-01-11 | 大唐移动通信设备有限公司 | Method, system and equipment for modifying cell parameters |
| CN105517086A (en) * | 2014-09-26 | 2016-04-20 | 上海贝尔股份有限公司 | Switching method used for double-connection, user equipment, and base stations |
| CN108632909A (en) * | 2017-03-24 | 2018-10-09 | 电信科学技术研究院 | A kind of QoS treating method and apparatus |
| CN111656817A (en) * | 2018-03-30 | 2020-09-11 | 中兴通讯股份有限公司 | Assisting communication node changes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101415214B (en) * | 2007-10-15 | 2012-04-25 | 华为技术有限公司 | Method and apparatus for negotiating relay system switching |
| CN101635949A (en) * | 2008-07-25 | 2010-01-27 | 三星电子株式会社 | Switching method in wireless cellular network |
| CN101616436A (en) * | 2009-07-08 | 2009-12-30 | 西安电子科技大学 | Based on the user selection switching method under the moving load equilibrating mechanism |
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2009
- 2009-08-07 CN CN2009101648896A patent/CN101990221A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102045780A (en) * | 2009-10-09 | 2011-05-04 | 中兴通讯股份有限公司 | Method and system for negotiating mobility parameter in LTE mobile communication system |
| CN102316485A (en) * | 2011-09-14 | 2012-01-11 | 大唐移动通信设备有限公司 | Method, system and equipment for modifying cell parameters |
| CN102316485B (en) * | 2011-09-14 | 2014-06-18 | 大唐移动通信设备有限公司 | Method, system and equipment for modifying cell parameters |
| CN105517086A (en) * | 2014-09-26 | 2016-04-20 | 上海贝尔股份有限公司 | Switching method used for double-connection, user equipment, and base stations |
| CN105517086B (en) * | 2014-09-26 | 2019-01-29 | 上海诺基亚贝尔股份有限公司 | Switching method, user equipment and base station for dual link |
| CN108632909A (en) * | 2017-03-24 | 2018-10-09 | 电信科学技术研究院 | A kind of QoS treating method and apparatus |
| CN108632909B (en) * | 2017-03-24 | 2019-08-23 | 电信科学技术研究院 | A kind of QoS treating method and apparatus |
| US11190984B2 (en) | 2017-03-24 | 2021-11-30 | Datang Mobile Communications Equipment Co., Ltd. | Quality of service processing method and device |
| CN111656817A (en) * | 2018-03-30 | 2020-09-11 | 中兴通讯股份有限公司 | Assisting communication node changes |
| CN111656817B (en) * | 2018-03-30 | 2021-11-23 | 中兴通讯股份有限公司 | Assisting communication node changes |
| US11310704B2 (en) | 2018-03-30 | 2022-04-19 | Zte Corporation | Secondary communication node change |
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| WO2011015144A1 (en) | 2011-02-10 |
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