CN102170626B - MME (mobility management entity)/UPE (user plane entity) reselection method and system of UE (user equipment) - Google Patents
MME (mobility management entity)/UPE (user plane entity) reselection method and system of UE (user equipment) Download PDFInfo
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Abstract
The invention discloses an MME (mobility management entity)/UPE (user plane entity) reselection method and system of UE (user equipment) which are applied to an evolved network. The system comprises an eNodeB (evolved NodeB) and an MME/UPE connected with the eNodeB, wherein the eNodeB is used for receiving a tracking area update request message initiated by the UE, selecting one MME/UPE meeting the highest quality of service from the MME/UPEs connected with the eNodeB to serve as the target MME/UPE after reselection, and sending an access request to the target MME/UPE; and the target MME/UPE is used for interacting with a service MME/UPE of the UE before reselection to obtain the mobility management context of the UE, and executing a position update register process of the UE to become the service MME/UPE of the UE after reselection. By adopting the method and system disclosed by the invention, the problem of communication quality drop or communication interrupt caused by excessively heavy load of the original service MME/UPE can be effectively avoided.
Description
Technical field
The present invention relates to evolvement network, relate in particular to a kind of subscriber equipment (User Equipment in the evolvement network, UE) Mobility Management Entity (Mobility Management Entity, MME)/user entity (User Plane Entity, UPE) reselecting method.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS) is to adopt the 3-G (Generation Three mobile communication system) of WCDMA air interface technologies, usually also the UMTS system is called the WCDMA communication system.The UMTS system has adopted and the similar structure of second generation mobile communication system, comprises Radio Access Network (Radio Access Network, RAN) and core network (Core Network, CN).Wherein Radio Access Network is for the treatment of all and wireless relevant function, and CN processes that all voice calls are connected with data in the UMTS system, and the exchange of realization and external network and routing function.CN is from being divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).UTRAN, CN and subscriber equipment (User Equipment, UE) have consisted of whole UMTS system together.Its system configuration as shown in Figure 1.
UTRAN is land radio access web, and it comprises one or several RNS (Radio Network Subsystem, RNS).A RNS is comprised of a radio network controller (Radio Network Controller, RNC) and one or more base station (NodeB).Interface between RNC and the CN is the Iu interface, and NodeB is connected Iub interface with RNC and connects.Inner at UTRAN, by the Iur interface inter-link, the Iur interface can connect or connect by transmission network by the direct physical between the RNC between the radio network controller.RNC is used for distributing and is attached thereto with control or the Radio Resource of relevant NodeB.NodeB then finishes the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously.The structure of UTRAN as shown in Figure 2.
The core network architecture in 3G PS territory as shown in Figure 3, the network element that mainly comprises: Serving GPRS Support Node (Serving GPRS Support Node, SGSN) and Gateway GPRS Support Node (Gateway GPRS Support Node, GGSN).
Wherein, SGSN is a basic composition network element of PS network.Its main effect is exactly the IP grouping of transmitting I/O for the UE of this SGSN coverage, and its status is similar to the VMSC (Visited Mobile Switching Center) in the CS territory.In addition, also integrated (the Visitor Location Register of Visited Location Registor in the CS network that is similar among the SGSN, VLR) function, when adhering to (Attached) state when the user is in, stored among the SGSN with grouping relevant user profile and positional information, similar with VLR, the most of user profile among the SGSN is obtained from attaching position register (Home Location Register, HLR) in position updating process.
GGSN also is a Network Element Function entity of introducing in order to provide the PS business function in the UMTS network, and route and the encapsulation of packet between PS net and external data network is provided.
At present in 3GPP, each manufacturer's active research Long Term Evolution (Long Term Evolution, LTE) network, the purpose of LTE provides a kind of network that can reduce time delay, raising user data rate, improved system capacity and low-cost covering, only use the PS territory professional, bearer network all is the IP carrying.
A kind of typical two-layer node evolution network framework comprises as shown in Figure 4:
LTE RAN: be the wireless access network of evolvement network, have evolution network base station (Evolved NodeB, eNodeB) entity, preserve subscriber equipment (User Equipment, UE) Radio Access Network (Radio Access Network, RAN) context (context) in logically is referred to as it Long Term Evolution radio access network entity (LTE-RAN Entity).
MME/UPE: be logic entity, the function of MME is to preserve mobile management (Mobility Management, the MM) context of UE, sign such as the user, mobility status, tracking area (Tracking Area, TA) information etc., and the user authenticated; The function of UPE is the entity of the UE termination downlink data of idle (idle) state, triggers simultaneously paging, preserves the context of UE, such as the IP address of UE and routing iinformation etc.
User's face anchor point (User Plane Anchor): be associated with UPE, keep the anchor point of user's face constant in during user's session.
Home subscriber servers (Home Subscriber Server, HSS): the HLR of evolution is associated storage and renewal user's log-on message with MME.
In evolvement network, MME/UPE and LTE-RAN Entity have many-to-many relationship, i.e. S1-flex.S1 is the interface of evolvement network RAN and evolution block core (Evolved Packet Core).As shown in Figure 5.
In evolvement network, MME and UPE not necessarily are positioned at same physical node, and also not limiting is core net (CN) node.For example: might be in EnodeB by UPE, MME is in CN as the chain of command node.
MME and UPE be a node not necessarily, may separate.Different MME and UPE can be configured in the pond, and entirely are connected by one of the service available eNodeB existence of IP network and all, namely are a multi-multipoint relation between logic configured MME/UPE and the service available eNodeB.After UE resided in a residential quarter, eNodeB can select according to principles such as load balancing the MME/UPE of a service.When moving between the eNodeB of UE in the MME/UPE pond at the MME/UPE place of selected service under idle (Idle) state, always can select the MME/UPE in stationary point as providing the MME/UPE of service for it.When occurrence positions more during new technological process, just by the relevant residing tracking area of UE (Tracking Area, the TA) information of eNodeB notification service MME/UPE, the flow process of MME/UPE gravity treatment does not occur.After Fig. 6 has showed that UE moves to different eNodeB, when professional arrival arranged, Business Stream will arrive by former serving MME/UPE the situation of UE.
Because in the prior art, when moving between the eNodeB of UE in same MME/UPE pond, always select the MME/UPE in stationary point as serving MME/UPE; But to be in load too heavy as serving MME/UPE, or serving MME/UPE is overweight to the link load of UE, or route is not when being the situation such as optimization, may not cause communication quality to descend or interrupts if do not change serving MME/UPE, and user communication business is produced larger impact.
Summary of the invention
The invention provides MME/UPE reselecting method and the system of a kind of UE, in order to solve in the prior art when moving between the eNodeB of UE in same MME/UPE pond, change owing to not carrying out serving MME/UPE, cause communication quality to descend or the problem of communication disruption.
An aspect of of the present present invention provides a kind of Mobility Management Entity MME/ user entity UPE gravity treatment system of user equipment (UE), be applied to evolvement network, comprise: base station eNodeB and the MME/UPE that is connected with described base station eNodeB, wherein, described base station eNodeB, after being used for receiving the tracing section updating request message that UE initiates, with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment; And to described target MME/UPE transmission access request; Described target MME/UPE for mutual with the serving MME/UPE of said UE before reselection, obtains the MM Context of described UE; Carry out the position registration updating flow process of described UE, become the serving MME/UPE of described UE after the gravity treatment.
Another aspect of the present invention also provides a kind of Mobility Management Entity MME/ user entity UPE reselecting method of user equipment (UE), be applied to evolvement network, comprise: base station eNodeB, after receiving the tracing section updating request message that UE initiates, with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment; And to described target MME/UPE transmission access request, so that UE and described target MME/UPE position registration updating flow process.
The present invention has following beneficial effect:
(1) because the gravity treatment of MME/UPE of the present invention is to be triggered by normal position update flow (periodically updating or UE leap TA border) by UE, on other flow process of existing network with use without any impact, only need eNodeB to carry out the comparison of each MME/UPE service quality by a tabulation of reading the backstage, determine whether to initiate again afterwards the reuse adoption process of MME/UPE.
(2) because eNodeB can determine the priority of each MME/UPE that is connected and upgrade tabulation by the backstage cycle, stronger real-time is arranged, on the not impact of performance of MME/UPE.
(3) regularly the parameters such as self load are sent on all coupled eNodeB by MME/UPE, eNodeB can determine the service quality rating of each MME/UPE, and implementation method is simple; ENodeB switches to serving MME/UPE of UE on the higher MME/UPE of service quality rating, effectively avoids causing owing to former serving MME/UPE load is overweight the problem of communication quality decline or communication disruption.
Description of drawings
Fig. 1 is UMTS system configuration schematic diagram;
Fig. 2 is the UTRAN schematic network structure;
Fig. 3 is PS territory schematic network structure;
A kind of evolution network structure schematic diagram of Fig. 4 for providing in the prior art;
Fig. 5 is that evolvement network is shared the S1-flex configuration schematic diagram;
Fig. 6 is service traffics routing mode schematic diagram in the prior art;
Fig. 7 is the service traffics routing mode schematic diagram after the present invention carries out serving MME/UPE gravity treatment;
Fig. 8 is that the present invention carries out one of MME/UPE gravity treatment signaling process;
Fig. 9 be the present invention carry out MME/UPE gravity treatment signaling process two.
Embodiment
The present invention proposes a kind of when UE initiates tracking area (TA) update request, the method for being carried out serving MME/UPE gravity treatment by eNodeB according to loading condition, route metric or the link condition etc. of coupled MME/UPE.Specifically comprise:
After eNodeB receives the tracing section updating request message that UE initiates, eNodeB with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment; And to target MME/UPE transmission access request; Target MME/UPE accesses judgement, determines whether to allow this eNodeB access; Serving MME/UPE of UE is mutual before target MME/UPE and the gravity treatment, obtains the MM Context of UE; Target MME/UPE carries out the position registration updating flow process of described UE, becomes the serving MME/UPE of UE after the gravity treatment.
As shown in Figure 7, carry out service traffics routing mode schematic diagram after serving MME/UPE gravity treatment for the present invention.Black solid line represents not pass through the service traffics route approach of eNodeB gravity treatment among Fig. 7, and black dotted line represents through the service traffics route approach after the eNodeB gravity treatment.That is: when not carrying out serving MME/UPE gravity treatment, serving MME/UPE of UE is MME/UPE1, carry out serving MME/UPE gravity treatment according to said method of the present invention after, serving MME/UPE of UE is MME/UPE3.
UE upgrades and to trigger eNodeB and carry out serving MME/UPE selection and flow chart chosen successfully as shown in Figure 8 owing to the position, comprises the steps:
Step 1, UE send the TA update request to eNodeB; Comprise grouping temporarily moved subscriber identification number (Packet-Temporary Mobile Subscriber Identify in the update request, P-TMSI), the parameters such as the tracking area identification (old TAI) of UE position before upgrading, old packet TMSI signature (old P-TMSI Signature) and updating type (Update Type), upgrade reason and can be and periodically update or UE finds to have entered a new tracking area.
After step 2, eNodeB receive the TA update request, from above-mentioned parameter, obtain the MME/UPE address for this UE service, and the target MME/UPE of the MME/UPE that the service quality optimum is satisfied in one of selection from all MME/UPE that are connected with self after as gravity treatment;
Select the concrete mode of the MME/UPE of service quality optimum to have a lot, for example:
Mode one: eNodeB obtains the current state information of all coupled MME/UPE immediately after receiving the TA update request, and according to state information, therefrom selects the target MME/UPE of MME/UPE after as gravity treatment that satisfies the service quality optimum;
Mode two: the service quality rating table of comparisons is set in eNodeB, the eNodeB cycle obtain all MME/UPE that are connected with self state information (such as: by MME/UPE with parameter timed sending such as self loads to all coupled eNodeB), and according to the state information of each MME/UPE that obtains, determine the service quality rating that MME/UPE can satisfy, the updating service quality grade table of comparisons;
ENodeB after receiving the TA update request, the inquiry service credit rating table of comparisons, the MME/UPE that service quality rating is the highest target MME/UPE after as gravity treatment;
Mode three: after determining service quality rating corresponding to each MME/UPE according to mode two, eNodeB with each MME/UPE according to from high to low or from low to high arranged sequentially of its service quality rating that can satisfy after, store into according to the order of sequence in the local priority orders tabulation;
ENodeB after receiving the TA update request, the target MME/UPE of the MME/UPE that selects to be arranged in the priority orders tabulation first or last after as gravity treatment;
Mode four: in eNodeB also can according in the routing table to the route metric information of each MME/UPE,, obtain eNodeB to the path metric value of all MME/UPE that are connected; ENodeB obtains the state information of each MME/UPE and in conjunction with the respective path metric, determine the service quality rating that each MME/UPE can satisfy, and MME/UPE and corresponding service quality rating information thereof are stored in the local service quality rating table of comparisons;
ENodeB inquires about the above-mentioned service quality rating table of comparisons after receiving the TA update request, the target MME/UPE of the MME/UPE that service quality rating is the highest after as gravity treatment;
Mode five: after determining service quality rating corresponding to each MME/UPE according to mode four, eNodeB with each MME/UPE according to from high to low or from low to high arranged sequentially of its service quality rating that can satisfy after, store into according to the order of sequence in the local priority orders tabulation;
ENodeB after receiving the TA update request, the target MME/UPE of the MME/UPE that selects to be arranged in the priority orders tabulation first or last after as gravity treatment.
In above-mentioned each mode, the state information of MME/UPE includes but not limited to: the UE quantity that is in state of activation that is connected with MME/UPE, the UE quantity that is in idle condition and/or cpu load condition information.
In this step 2, after eNodeB determines target MME/UPE, judge also whether serving MME/UPE of the front UE of this target MME/UPE and gravity treatment is same MME/UPE; If not same MME/UPE, continue step 3; If same MME/UPE does not then need to carry out serving MME/UPE gravity treatment, directly finish the gravity treatment flow process.
Step 3, eNodeB send access request message to the target MME/UPE that selects.
Step 4, target MME/UPE determine whether to accept access request (namely whether allowing this UE access) according to self up-to-date parameter such as load state; If do not allow, then carry out flow process shown in Figure 9 (treating aftermentioned); If accept access request, continue step 5.
The serving MME of step 5, target MME/UPE UE before the gravity treatment/UPE sends context (Context) transfer request, wherein comprise some necessary information, such as the address information of P-TMSI, oldTAI, TLLI (TLLI), old P-TMSI Signature and target MME/UPE.
Serving MME/UPE of UE returns MM Context response message before the step 6, gravity treatment, and the MM Context of UE is transferred to target MME/UPE.
Between step 7, UE and the target MME/UPE, and may carry out a safety certification process between the HSS in target MME/UPE and the network.
After step 8, authentication were passed through, target MME/UPE serving MME/UPE before the gravity treatment sent and receives MM context acknowledge message.
The Anchor of data pack protocol (Packet Data Protocol, PDP) the updating context request that step 9, target MME send this UE in the network; The address information, termination point of a tunnel sign (TEID), the negotiation (QoS Negotiated) of service quality, service network identification (serving network identity), Cell Global Identity (the Cell Global Identifier that comprise target MME/UPE in the PDP Context request message, CGI) or the parameters such as Service Area Identifier (Serving Area Identity, SAI) and radio access technology types (RAT type).
Step 10, Anchor upgrade the content of the PDP Context field (PDP context fields) of this UE, and return PDP Context and upgrade response message, in this response message, comprise TEID, forbid load compression (Prohibit Payload Compression) and APN restriction parameters such as (APN Restriction).
Step 11, target MME/UPE send location update message to HSS.
Step 12, HSS serving MME/UPE before the gravity treatment sends canceling position message, may comprise following parameter: international mobile subscriber identification code (International Mobile Subscriber Identity, IMSI) and cancellation type (Cancellation Type).
Serving MME/UPE sends the canceling position acknowledge message to HSS before step 13, the gravity treatment.
Step 14a, HSS send user's subscription data to target MME/UPE;
Step 14b, target MME/UPE confirm that UE is the new MM Context (MM context) of UE establishment after being positioned at new Route Area, and return insertion user data acknowledge message to HSS;
After step 14c, HSS receive confirmation, upgrade acknowledge message to target MME/UPE home position.
Step 15, target MME/UPE send the TA renewal to UE and accept message, comprise new P-TMSI, P-TMSI Signature, the parameters such as new TAI.
Step 16, UE return the TA renewal to target MME/UPE and finish message.
UE triggers eNodeB gravity treatment MME/UPE and selects failed flow chart as shown in Figure 9 owing to the position renewal, comprises the steps:
Step 1-3: identical with step 1-3 in the flow process shown in Figure 8, do not repeat;
Step 4, target MME/UPE determine whether to allow this UE access according to self up-to-date parameter such as load state; If court verdict continues step 5 for not allowing access;
Step 5, target MME/UPE send refusal access message to eNodeB;
The serving MME of step 6, eNodeB UE before the gravity treatment/UPE sends the TA update inquiry information;
Serving MME/UPE of UE sends the TA renewal to UE and accepts message before step 7, the gravity treatment, comprises P-TMSI, P-TMSI Signature, the parameters such as new TAI;
Step 8, UE serving MME/UPE of UE before the gravity treatment returns TA and upgrades and finish message.
In said method of the present invention, serving MME/UPE of UE is arranged in same resource pool before target MME/UPE and the gravity treatment.
In sum, because the gravity treatment of MME/UPE of the present invention is to be triggered by normal position update flow (periodically updating or UE leap TA border) by UE, on other flow process of existing network with use without any impact, only need eNodeB to carry out the comparison of each MME/UPE service quality by a tabulation of reading the backstage, determine whether to initiate again afterwards the reuse adoption process of MME/UPE.
Because eNodeB can determine the priority of each MME/UPE that is connected and upgrade tabulation by the backstage cycle, and stronger real-time is arranged, on the not impact of performance of MME/UPE.
The parameters such as the load of MME/UPE only need timed sending to all coupled eNodeB, and eNodeB just can determine the service quality rating of each MME/UPE, realize simple flexibly.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the Mobility Management Entity MME/ user entity UPE gravity treatment system of a user equipment (UE) is applied to evolvement network, it is characterized in that, comprising: base station eNodeB and the MME/UPE that is connected with described base station eNodeB, wherein,
Described base station eNodeB, be used for receiving the tracing section updating request message that UE initiates after, with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment; And to described target MME/UPE transmission access request;
Described target MME/UPE for mutual with the serving MME/UPE of said UE before reselection, obtains the MM Context of described UE; Carry out the position registration updating flow process of described UE, become the serving MME/UPE of described UE after the gravity treatment.
2. the system as claimed in claim 1 is characterized in that, the target MME/UPE that described base station eNodeB is used for after the MME/UPE that is connected with self selects a MME/UPE who satisfies the service quality optimum as gravity treatment specifically comprises:
Described eNodeB is used for obtaining the current state information of all coupled MME/UPE, and according to state information, therefrom selects the target MME/UPE of MME/UPE after as gravity treatment that satisfies the service quality optimum.
3. the system as claimed in claim 1, it is characterized in that, described base station eNodeB, also be used for the service quality rating table of comparisons is being set itself, cycle is obtained the state information of all MME/UPE that are connected with self, and determine the service quality rating that corresponding MME/UPE can satisfy according to described state information, upgrade the described service quality rating table of comparisons.
4. system as claimed in claim 3 is characterized in that, described base station eNodeB also is used for according to routing table information, and the path metric value list is set, and stores described eNodeB to the path metric value of all MME/UPE that are connected; According to state information and the respective path metric of each MME/UPE that obtains, determine the service quality rating that each MME/UPE can satisfy, upgrade the described service quality rating table of comparisons.
5. system as claimed in claim 4, it is characterized in that, described base station eNodeB, also be used for the priority orders tabulation also is being set itself, with described MME/UPE according to from high to low or from low to high arranged sequentially of its service quality rating that can satisfy after, store according to the order of sequence in the tabulation of described priority orders the target MME/UPE of the MME/UPE that selects to be arranged in the described priority orders tabulation first or last after as gravity treatment into.
6. such as the described system of the arbitrary claim of claim 2-5, it is characterized in that, the state information of described MME/UPE comprises:
The UE quantity that is in state of activation that is connected with described MME/UPE, the UE quantity that is in idle condition and/or CUP load state information.
7. such as the described system of the arbitrary claim of claim 1-5, it is characterized in that described base station eNodeB is used for also judging whether serving MME/UPE of described target MME/UPE and the front UE of gravity treatment is same MME/UPE; If not same MME/UPE, continue to carry out the described function that sends access request to described target MME/UPE; Otherwise, finish the MME/UPE reselection functionality.
8. such as the described system of the arbitrary claim of claim 1-5, it is characterized in that described target MME/UPE also is used for judgement and whether accepts access request; If accept, the serving MME of the continuation described target MME/UPE of execution and said UE before reselection/UPE interactive function; Otherwise, return access-reject message to described eNodeB;
After described eNodeB also was used for receiving access-reject message, the serving MME of UE/UPE sent the tracing section updating request message, carries out conventional tracing section updating function before the gravity treatment.
9. such as the described system of the arbitrary claim of claim 1-5, it is characterized in that,
Described target MME/UPE also for mutual with the anchor point Anchor of network, upgrades the data pack protocol PDP Context of described UE; Mutual with home subscriber servers HSS in the network, obtain the subscription data of described UE and upgrade positional information; Upgrade to described UE returning tracking district as the serving MME/UPE after the gravity treatment and to accept message, receive the tracing section updating that described UE returns and finish message.
10. such as the described system of the arbitrary claim of claim 1-5, it is characterized in that, the serving MME/UPE of described target MME/UPE and said UE before reselection is arranged in same resource pool.
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| CN2006100726466A Division CN101052209B (en) | 2006-04-07 | 2006-04-07 | User's face entity reselecting method for user's equipment mobility managing entity |
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| WO2014101046A1 (en) * | 2012-12-27 | 2014-07-03 | 华为技术有限公司 | Network device deployment method, base station, and network element management device |
| US10097962B2 (en) * | 2013-09-12 | 2018-10-09 | Huawei Technologies Co., Ltd. | System and method for virtual user-specific connectivity management |
| EP3141039B1 (en) | 2014-05-08 | 2020-07-22 | Interdigital Patent Holdings, Inc. | Method and mobility management entity, mme, for re-directing a ue to a dedicated core network node |
| KR102024332B1 (en) * | 2014-06-17 | 2019-09-23 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Mme reselection method and mme |
| WO2016000173A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Method for network management, mme and base station device |
| US9832719B2 (en) * | 2014-10-17 | 2017-11-28 | Qualcomm Incorporated | Selection of a serving node in a wireless communication system |
| KR102191334B1 (en) | 2015-12-31 | 2020-12-15 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Mobility management method, terminal, and base station |
| CN107666683B (en) | 2016-07-29 | 2019-08-30 | 电信科学技术研究院 | A kind of method, terminal and the base station of wireless system district management |
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| US11533594B2 (en) | 2017-12-15 | 2022-12-20 | Sony Corporation | Enhanced NEF function, MEC and 5G integration |
| CN112153647B (en) * | 2019-06-29 | 2022-04-22 | 华为技术有限公司 | Communication method and related equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1665340A (en) * | 2004-03-04 | 2005-09-07 | 株式会社Ntt都科摩 | Mobile communication network system and a mobility managing unit |
| CN1674711A (en) * | 2003-12-02 | 2005-09-28 | 三星电子株式会社 | Inter-technology handoff method in an IP-based wireless communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674711A (en) * | 2003-12-02 | 2005-09-28 | 三星电子株式会社 | Inter-technology handoff method in an IP-based wireless communication system |
| CN1665340A (en) * | 2004-03-04 | 2005-09-07 | 株式会社Ntt都科摩 | Mobile communication network system and a mobility managing unit |
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