CN103702368B - A kind of SGSN systems of selection and equipment - Google Patents

A kind of SGSN systems of selection and equipment Download PDF

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CN103702368B
CN103702368B CN201310741910.0A CN201310741910A CN103702368B CN 103702368 B CN103702368 B CN 103702368B CN 201310741910 A CN201310741910 A CN 201310741910A CN 103702368 B CN103702368 B CN 103702368B
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sgsn
terminal
mme
lte
rnc
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CN103702368A (en
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段江海
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The embodiment of the invention discloses a kind of SGSN systems of selection and equipment, are related to wireless communication field, and for solving in prior art under SGSN MME fusion POOL group-network constructions, the big problem of interoffice signaling expense.In the embodiment of the present invention, when terminal is accessed, RNC obtains the LTE tenabilities of terminal, and is defined as the mode that the terminal selects SGSN；If RNC determines that adopting load balancing mode selects SGSN for terminal, then LTE tenabilities according to terminal, SGSN is selected for terminal from SGSN resource pools, SGSN resource pools include the SGSN for the supporting SGSN mobile management entity MME fusion functions and SGSN for not supporting SGSN MME fusion functions, merge under POOL group-network constructions in SGSN MME in solving prior art, the big problem of interoffice signaling expense.

Description

SGSN selection method and equipment
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for SGSN selection.
Background
Starting from release R5, 3GPP introduced Iu-Flex functionality. The Iu-Flex function allows one RNC (radio network Controller) to physically connect multiple SGSNs (Serving GPRS supporting nodes), and the areas covered by these SGSN nodes belong to the same POOL area. From the RAN (Radio Access Network) perspective, the POOL Area includes all RA (Routing Area) areas of the RNC served by a set of SGSN nodes. Multiple SGSNs are operating in parallel in the POOL area and share traffic in the POOL area. The POOL area enhances the adaptability of Iu Interface (Interface between CN and RNC), and a typical networking architecture is shown in fig. 1.
NRI (Network Resource identity) is used to uniquely Identify one SGSN node in the POOL area. The NRI is included in the P-TMSI (Packet temporal Mobile subscriber Identity), has flexible length allocation, varies from 0bits to 10bits, and is determined by network planning.
SGSN POOL networking has the following advantages:
(1) load sharing among SGSN nodes is realized in the POOL area, and the network reliability is improved;
(2) by sharing network resources, the utilization rate of equipment is improved, and investment is saved;
(3) the mobility management load is effectively reduced, and the network quality is improved. As a user moves within the POOL area, the SGSN node that he serves does not change. Therefore, after adopting the SGSN POOL networking, the switching between offices (between SGSNs) is greatly reduced and the signaling load is greatly reduced.
When a UE (User Equipment, terminal) accesses a 3G packet domain network, an RNC needs to select an SGSN serving the UE from SGSN POOL. Generally, the RNC selects the serving SGSN for the UE using a load balancing approach or an NRI planning approach.
Under the load balancing mode, the RNC selects an SGSN with normal state and accessible signaling point from the SGSN POOL according to the load balancing algorithm as the SGSNThe serving SGSN of the user. Considering that the capacities of the SGSNs connected to the RNC may be different, the RNC configures a weight for each connected SGSN. When the RNC allocates the UE, the quantity of the UE allocated to each SGSN can be allocated according to the weight proportion relation. Specifically, assume that the number of connected SGSNs of the RNC is N, and the weight of each SGSN is M1：M2……：MN. Let M = M1+M2+……+MNThen, when the number of consecutively accessed users reaches M, the users are allocated to each SGSN, and the number of users allocated by each SGSN satisfies the configured proportional relationship. If some SGSN signaling point is not reachable or in a forbidden state, the proportional relation is satisfied for the number of users distributed by each normal SGSN.
In an EPC (Evolved Packet Core) architecture, 3GPP introduces an S1-Flex function. The S1-Flex function allows an e-NB (Evolved Node B, i.e., base station) to be physically connected to multiple MMEs (Mobile Management entities), and the areas covered by the MME nodes belong to the same POOL Area, which is a collection of complete TA (tracking Area) areas. A typical networking architecture is shown in fig. 2.
When the UE accesses an LTE (Long Term Evolution) network, the e-NB selects an MME serving the UE from MME POOL in a load balancing mode. MME POOL networking has the same advantages as SGSN POOL networking. In addition, because the serving MME does not need to be replaced when the UE moves in the MME POOL, the inter-office (inter-MME) switching is greatly reduced and the signaling load is greatly reduced after the MME POOL networking is adopted in the whole network.
In the process of building an LTE network, an operator generally faces the problem of convergence between an existing 3G network and a newly-built LTE network. The problem relates to a plurality of aspects such as terminal, access network, core network, operation and support system, etc. In terms of core network, the current mainstream solution is to use a fusion device networking, which includes an SGSN-MME fusion device, an SAE GW (System Architecture Evolution GateWay) -GGSN (GateWay gprs support Node ) fusion device, an HLR (Home location register) -HSS (Home Subscriber Server) fusion device, and the like. The fusion path can be realized by the newly-built EPC equipment supporting the 3G network function at the same time, or by the EPC function supported by the 3G equipment of the current network after software upgrading. For the SGSN-MME fusion device, it is necessary to support both MME POOL and SGSN POOL functions. Fig. 3 shows a typical networking architecture of an SGSN-MME converged POOL. The number of SGSNs and MME-SGSNs in fig. 3 is not limited.
As shown in FIG. 3, the SGSN POOL is supported by the SGSN1、SGSN2、SGSN3、SGSN4、SGSN5、SGSN6The MME POOL is composed of MME1、MME2、MME3And (4) forming. MME1、MME2、MME3For converged devices, while supporting SGSN functionality, i.e. MME1And SGSN4、MME2And SGSN5、MME3And SGSN6Physically the same equipment. Because continuous coverage is generally not achieved in the initial stage of the LTE network construction, and a process is needed for the development of LTE users, the coverage of the LTE network is only a part of the coverage of the 3G network. In this scenario, the terminal accessing the 3G network may be a 3G terminal, and may also be a 3G/LTE multimode terminal; terminals accessing an LTE network are typically 3G/LTE multimode terminals.
In the prior art, if a load balancing manner is adopted to select an SGSN for an access user, an RNC allocates the access user to each SGSN in an SGSN POOL according to a load balancing algorithm. As a 3G subscriber moves within the SGSN POOL area, its serving SGSN will not change if no 3G network to LTE network reselection has occurred. If reselection from the 3G network to the LTE network occurs, the e-NB selects an MME for the user from the MME POOL as the serving MME, and the case is only for the terminal with LTE network access capability (3G/LTE multimode terminal). The RNC may select a non-converged device as the SGSN serving the 3G/LTE multimode terminal, and if the multimode terminal moves and reselects to the LTE network subsequently, the e-NB selects a serving MME for the terminal, and the reselection process needs to be completed through signaling interaction between the MME and the SGSN serving originally, so that the signaling processing load is increased.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for selecting SGSN (service GPRS supporting node), which are used for solving the problem of high inter-office signaling overhead under the condition of SGSN-MME (service GPRS supporting node) -fused POOL (POOL) networking architecture in the prior art.
An SGSN selection method, comprising:
when a terminal is accessed, a Radio Network Controller (RNC) obtains the Long Term Evolution (LTE) support capability of the terminal and determines a mode of selecting an SGSN for the terminal; and if the RNC determines that the load balancing mode is adopted to select the SGSN for the terminal, selecting the SGSN for the terminal from an SGSN resource pool according to the LTE supporting capacity of the terminal, wherein the SGSN resource pool comprises the SGSN supporting the SGSN-MME fusion function and the SGSN not supporting the SGSN-MME fusion function.
According to the scheme, the RNC can identify the LTE support capability of the terminal, can identify whether the SGSN is the SGSN supporting the SGSN-MME fusion function, and can select the SGSN supporting the SGSN-MME fusion function or the SGSN not supporting the SGSN-MME fusion function for the terminal from the SGSN resource pool, so that the problem that the RNC distributes the terminal with the LTE support capability to the SGSN not supporting the SGSN-MME fusion function in the prior art is avoided, and the interoffice signaling load of the SGSN when the terminal moves from a 3G network coverage area to an LTE network coverage area is reduced.
Preferably, if the terminal does not have the LTE support capability, selecting an SGSN for the terminal in the SGSNs which do not support the SGSN-MME fusion function in the SGSN resource pool by adopting a load balancing mode; and if the terminal has LTE support capability, selecting the SGSN for the terminal in the SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool preferentially by adopting a load balancing mode.
According to the scheme, the RNC can preferentially select the SGSN supporting the SGSN-MME fusion function for the terminal with the LTE support capability so as to reduce the probability that the SGSN is changed after the terminal with the LTE support capability moves from the 3G network to the LTE network, and the RNC can preferentially select the SGSN not supporting the SGSN-MME fusion function for the terminal without the LTE support capability so as to reserve SGSN resources supporting more SGSN-MME fusion functions for the terminal with the LTE support capability.
Preferably, if the terminal does not have the LTE support capability, the operation is performed according to a first formula, where the first formula is: n is a radical of1=n1mod(K*L1+L2) (ii) a If 1 is less than or equal to N1≤K*L1If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool; wherein n is1The value of a first counter is used for counting the continuously accessed terminals without LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2The weight of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool is added; mod denotes the remainder operation.
According to the scheme, the RNC preferentially selects the SGSN supporting the SGSN-MME fusion function for the terminal with the LTE supporting capability, and after the SGSN supporting the SGSN-MME fusion function in the SGSN resource pool is balanced, the RNC can select the SGSN which does not support the SGSN-MME fusion function in the SGSN resource pool for the terminal, so that the load balance in the SGSN resource pool is ensured.
Preferably, if the terminal has LTE support capability, the operation is performed according to a second formula, where the second formula is: n is a radical of2=n2mod(K*L2+L1) (ii) a If 1 is less than or equal to N2≤K*L2Then the RNC selects from the resource poolThe SGSN supporting the SGSN-MME fusion function, otherwise, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool; wherein n is2The value of a second counter is used for counting the continuously accessed terminals with the LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2The weight of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool is added; mod denotes the remainder operation.
According to the scheme, the RNC preferentially selects the SGSN which does not support the SGSN-MME fusion function for the terminal which does not have the LTE support capability. In each round of SGSN selection, only after SGSN loads which do not support the SGSN-MME fusion function in the SGSN resource pool are balanced, the RNC selects the SGSN which supports the SGSN-MME fusion function in the SGSN resource pool for the terminal, and in the aspect of SGSN resource pool capacity, the times of selecting the SGSN which does not support the SGSN-MME fusion function are integral multiples of the times of selecting the SGSN which supports the SGSN-MME fusion function.
Preferably, if the terminal accesses the network by using international mobile identity IMEI as the user identifier, the RNC determines to select the SGSN for the terminal in a load balancing manner; or, if the terminal accesses the network by using the international mobile subscriber identity IMSI as the subscriber identity, the RNC determines to select the SGSN for the terminal in a load balancing manner.
According to the scheme, as long as the RNC determines that the SGSN is selected for the terminal in a load balancing mode, the SGSN which does not support the SGSN-MME fusion function can be preferentially selected for the terminal without the LTE support capability, and the SGSN which supports the SGSN-MME fusion function can be preferentially selected for the terminal with the LTE support capability.
An RNC, comprising:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the Long Term Evolution (LTE) support capability of a terminal when the terminal is accessed;
a determining unit, configured to determine, when a terminal accesses, a manner of selecting a serving gprs support node SGSN for the terminal;
and the selecting unit is used for selecting the SGSN for the terminal from an SGSN resource pool according to the LTE supporting capacity of the terminal obtained by the obtaining unit under the condition that the determining unit determines to adopt a load balancing mode to select the SGSN for the terminal, wherein the SGSN resource pool comprises the SGSN supporting the SGSN-MME fusion function and the SGSN not supporting the SGSN-MME fusion function.
According to the scheme, the RNC can identify the LTE support capability of the terminal, can identify whether the SGSN is the SGSN supporting the SGSN-MME fusion function, and can select the SGSN supporting the SGSN-MME fusion function or the SGSN not supporting the SGSN-MME fusion function for the terminal from the SGSN resource pool, so that the problem that the RNC distributes the terminal with the LTE support capability to the SGSN not supporting the SGSN-MME fusion function in the prior art is avoided, and the interoffice signaling load of the SGSN when the terminal moves from a 3G network coverage area to an LTE network coverage area is reduced.
Preferably, the selecting unit is specifically configured to, if the terminal does not have an LTE support capability, preferentially select an SGSN for the terminal in an SGSN that does not support an SGSN-MME fusion function in the SGSN resource pool by using a load balancing manner; and if the terminal has LTE support capability, selecting the SGSN for the terminal in the SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool preferentially by adopting a load balancing mode.
According to the scheme, the RNC can preferentially select the SGSN supporting the SGSN-MME fusion function for the terminal with the LTE support capability so as to reduce the probability that the SGSN is changed after the terminal with the LTE support capability moves from the 3G network to the LTE network, and the RNC can preferentially select the SGSN not supporting the SGSN-MME fusion function for the terminal without the LTE support capability so as to reserve SGSN resources supporting more SGSN-MME fusion functions for the terminal with the LTE support capability.
Preferably, the selection isThe unit is specifically configured to, if the terminal does not have the LTE support capability, perform an operation according to a first formula, where the first formula is: n is a radical of1=n1mod(K*L1+L2) (ii) a If 1 is less than or equal to N1≤K*L1If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool; wherein n is1The value of a first counter is used for counting the continuously accessed terminals without LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2Mod represents the remainder operation for the sum of the weights of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool.
According to the scheme, the RNC preferentially selects the SGSN supporting the SGSN-MME fusion function for the terminal with the LTE supporting capability. In each round of SGSN selection, only after the SGSN load supporting the SGSN-MME fusion function in the SGSN resource pool is balanced, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the SGSN resource pool for the terminal, and in the aspect of the SGSN resource pool capacity, the times of selecting the SGSN supporting the SGSN-MME fusion function are integral multiples of the times of selecting the SGSN which does not support the SGSN-MME fusion function.
Preferably, the selecting unit is specifically configured to, if the terminal has LTE support capability, perform an operation according to a second formula, where the second formula is: n is a radical of2=n2mod(K*L2+L1) (ii) a If 1 is less than or equal to N2≤K*L2If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool; wherein n is2The value of a second counter is used for counting the continuously accessed terminals with the LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2In SGSN resource poolThe sum of the weights of all SGSNs supporting the SGSN-MME fusion function; mod denotes the remainder operation.
According to the scheme, the RNC preferentially selects the SGSN which does not support the SGSN-MME fusion function for the terminal which does not have the LTE support capability, and after the load of the SGSN which does not support the SGSN-MME fusion function in the SGSN resource pool is balanced, the RNC can select the SGSN which supports the SGSN-MME fusion function in the SGSN resource pool for the terminal, so that the load balance in the SGSN resource pool is ensured.
Preferably, the determining unit is specifically configured to determine that the SGSN is selected for the terminal in a load balancing manner if the terminal accesses the network using the international mobile identity IMEI as the user identity; or, if the terminal accesses the network by using the international mobile subscriber identity IMSI as the subscriber identity, determining to select the SGSN for the terminal in a load balancing manner.
According to the scheme, as long as the RNC determines that the SGSN is selected for the terminal in a load balancing mode, the SGSN which does not support the SGSN-MME fusion function can be preferentially selected for the terminal without the LTE support capability, and the SGSN which supports the SGSN-MME fusion function can be preferentially selected for the terminal with the LTE support capability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a diagram illustrating a prior art SGSN POOL networking architecture;
FIG. 2 is a schematic diagram of an MME POOL networking architecture in the prior art;
FIG. 3 is a diagram of a prior art SGSN-MME converged POOL networking architecture;
fig. 4 is a flowchart illustrating SGSN selection according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating selecting an SGSN for a terminal without LTE support capability according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating selecting an SGSN for a terminal with LTE support capability according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an RNC according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an SGSN selection method which is suitable for a networking scene of SGSN-MME fusion POOL. Compared with the prior art, the embodiment of the invention has the advantages that in the adjacent SGSN information configured by the RNC, the adjacent SGSN information also has information on whether each adjacent SGSN supports the SGSN-MME fusion function or not besides the information of the number of the adjacent SGSNs, the office direction identification, the point code, the NRI planning, the weight and the like of each adjacent SGSN.
In the embodiment of the invention, when a terminal is accessed, an RNC obtains the LTE support capability of the terminal and determines the mode of selecting the SGSN by the terminal, if the RNC determines to select the SGSN for the terminal in a load balancing mode, the SGSN supporting the SGSN-MME fusion function or the SGSN not supporting the SGSN-MME fusion function in an SGSN resource pool is selected for the terminal according to the LTE support capability of the terminal, and the RNC can flexibly select the SGSN serving the terminal, thereby reducing the waste of signaling between SGSN offices caused by the terminal moving to an LTE network and reducing the signaling processing load of the SGSN.
The following describes embodiments of the present invention with reference to the drawings.
Based on the architecture shown in fig. 3, fig. 4 shows a flowchart of selecting an SGSN according to an embodiment of the present invention. In the terminal access process, the process of selecting the SGSN for the terminal by the RNC may include:
step 41: the RNC determines the manner in which to select the SGSN for the terminal. This embodiment is described by taking an example that the RNC decides to select the SGSN for the terminal in a load balancing manner.
In a specific implementation, when the terminal is accessed, the method for the RNC to select the SGSN for the terminal may include: load balancing, NRI planning, etc. Specifically, step 41 may be implemented by:
(1) if the user accesses the network by using an International Mobile Equipment Identity (IMEI) as a user identifier, the RNC decides to select an SGSN for the corresponding terminal by using a load balancing method.
(2) If the user accesses the network by using the IMSI (International Mobile Subscriber Identity) as the user identifier and the user is the calling party, the RNC decides to select the SGSN for the corresponding terminal by using a load balancing method.
(3) If the user accesses the Network by using the IMSI as a user identifier and the user is called, the RNC determines to determine the SGSN serving the corresponding terminal according to a correspondence between the IMSI and a Global CN-ID (Global Core Network Identity) recorded by the RNC when the SGSN pages the UE.
(4) If the user accesses the network by taking the P-TMSI as the user identification, the RNC decides to adopt an NRI planning mode to select the SGSN for the corresponding terminal.
Step 42: and under the condition that the RNC determines to adopt a load balancing mode to select the SGSN for the terminal, the RNC acquires the LTE support capability of the terminal.
In specific implementation, if the RNC determines to select the SGSN for the terminal in a load balancing manner, the RNC obtains the LTE support capability of the terminal.
The RNC acquires the LTE support capability of the terminal through a terminal multi-mode/multi-RAT capability message element (UE multi-mode/multi-RAT capability IE) in the terminal radio access capability (UE radio access capability) in a radio resource control CONNECTION setup complete (RRC CONNECTION SETUPCOMPLETE) message responded by the terminal. Specifically, the value of a Support evolved universal terrestrial radio access frequency division duplex (Support of E-UTRAFDD) in the IE indicates whether the terminal supports FDD LTE capability, and the value of a Support evolved universal terrestrial radio access time division duplex (Support of E-UTRA TDD) indicates whether the terminal supports TDD LTE capability.
The terminal with the LTE support capability at least comprises a 3G/LTE multimode terminal, and the terminal without the LTE support capability at least comprises a 3G terminal or a 2G/3G terminal.
Step 43: if the terminal does not have the LTE support capability, the RNC preferentially selects the SGSN for the terminal from the SGSNs which do not support the SGSN-MME fusion function in the SGSN resource pool.
Step 44: if the terminal has LTE support capability, the RNC preferentially selects the SGSN for the terminal from the SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool.
It can be seen from the above embodiments that, if the RNC determines to select the SGSN for the terminal in a load balancing manner, the RNC preferentially selects an SGSN that does not support the SGSN-MME fusion function for a terminal without LTE support capability from the SGSN resource pool according to the LTE support capability of the continuously accessed terminal, and reserves more SGSN resources that support the SGSN-MME fusion function for a terminal with LTE support capability; the RNC preferentially selects the SGSN supporting the SGSN-MME fusion function for the terminal with the LTE supporting capability from the SGSN resource pool, reduces the probability of changing the SGSN after the terminal with the LTE supporting capability moves from the 3G network to the LTE network, and reduces the signaling load between offices.
As a preferred embodiment, the implementation process of step 43 may specifically include:
based on the flow chart shown in fig. 4, fig. 5 is a schematic flow chart of a preferred embodiment for implementing step 43.
The RNC can be provided with a first counter and a second counter, wherein the first counter is used for counting the continuously accessed terminals without the LTE support capability, and the second counter is used for counting the continuously accessed terminals with the LTE support capability. When a terminal without LTE support capability is accessed, the process of selecting an SGSN for the terminal by the RNC is shown in fig. 5, and the flow may include:
step 51: the RNC determines that the current accessed terminal is a terminal without LTE support capability, and reads the count value n of the first counter1；
Step 52: the RNC calculates according to the following formula:
N1=n1mod(K*L1+L2)
wherein K is a selective scaling factor, K is an integer greater than or equal to 1, and O is&M (Operation and maintenance) configuration; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2The weight of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool is added; mod denotes the remainder operation.
Step 53: if 1 is less than or equal to N1≤K*L1Then go to step 54, otherwise go to step 55.
Step 54: and the RNC selects SGSN which does not support the SGSN-MME fusion function in the resource pool.
Step 55: and the RNC selects the SGSN supporting the SGSN-MME fusion function in the resource pool.
It can be seen that, when K is equal to 1, the method is equivalent to the prior art, and when K is an integer greater than 1, the method can implement that, for a terminal that does not support LTE capability, an SGSN that does not support SGSN-MME fusion function is preferentially selected, so as to reserve more SGSN resources that support SGSN-MME fusion function for a terminal that has LTE support capability.
As another preferred embodiment, the implementation process of step 44 may be as shown in fig. 6, and may specifically include:
step 61: the RNC determines that the current accessed terminal is the terminal with the LTE support capability, and reads the count value n of the second counter2；
Step 62: the RNC calculates according to the following formula:
N2=n2mod(K*L2+L1)；
wherein K is a selective scaling factor, K is an integer greater than or equal to 1, and O is&Configuring M; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2The weight of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool is added; mod denotes the remainder operation.
And step 63: if 1 is less than or equal to N2≤K*L2Then go to step 64, otherwise go to step 65.
Step 64: and the RNC selects the SGSN supporting the SGSN-MME fusion function in the resource pool.
Step 65: and the RNC selects SGSN which does not support the SGSN-MME fusion function in the resource pool.
It can be seen that, when K is equal to 1, the method is equivalent to the prior art, and when K is an integer greater than 1, the method can be implemented such that the terminal supporting LTE capability preferentially selects an SGSN supporting the SGSN-MME fusion function, so as to reduce the probability that the terminal having LTE support capability changes the SGSN after moving from the 3G network to the LTE network, and reduce the signaling load between offices.
If the RNC determines that the NRI planning mode is adopted to select the SGSN for the terminal, the RNC obtains a corresponding network resource identification code NRI from the P-TMSI of the UE and selects the SGSN for service for the UE according to the planned corresponding relation between the NRI and the SGSN. And the planned corresponding relation between the NRI and the SGSN is configured to the RNC through O & M. If the NRI obtained by the RNC does not have the corresponding SGSN, or the corresponding SGSN signaling point is not reachable, or the corresponding SGSN is in a forbidden state, the RNC selects an SGSN with a normal state and a reachable signaling point from the SGSNPOOL by using a load balancing mode.
The following describes a specific implementation process of steps 42 to 44 by taking a specific networking architecture as an example.
The SGSN POOL of the networking architecture comprises 6 SGSNs which are divided into two groups of SGSN POOL parts1And SGSN POOLpart2Wherein SGSN POOL part1By SGSN1、SGSN2、SGSN3Composition, SGSN1、SGSN2、SGSN3SGSN POOL part, SGSN Equipment not supporting SGSN-MME fusion function2By MME1/SGSN4、MME2/SGSN5、MME3/SGSN6Composition, MME1/SGSN4、MME2/SGSN5、MME3/SGSN6SGSN equipment for supporting the SGSN-MME fusion function. The weight of each SGSN is M1：M2：……M6，L1=M1+M2+M3，L2=M4+M5+M6。O&M configures SGSN POOL part for RNC1And SGSN POOL part2Is selected as the scaling factor K (K is an integer greater than or equal to 1).
If the RNC determines that the load balancing mode is adopted to select the SGSN for the terminal and the terminal does not have the LTE support capability (such as a 3G terminal or a 2G/3G terminal), the RNC preferentially selects the SGSN in the SGSN POOL part1Wherein SGSN is selected for the terminal to be in SGSNPOOL part2More resources are reserved for the terminal with the LTE supporting capability. If the RNC determines that the load balancing mode is adopted to select the SGSN for the terminal, the RNC determines that the terminal has LTE support energyForce (e.g. 3G terminal or 2G/3G terminal, etc.), RNC prefers to be in SGSNPOOL part2To reduce the probability of changing the SGSN after the terminal moves from the 3G network to the LTE network.
Specifically, the RNC may select the SGSN for the terminal according to the manners shown in fig. 4 to fig. 6, and may achieve the following effects:
when the terminal without LTE support capability is accessed, the RNC can judge the number of the terminals without LTE support capability which are connected and accessed, if the number does not exceed K L1And then RNC according to SGSN POOL part1The weight of each SGSN in the system is selected from SGSNPOOL part1Wherein the SGSN is selected to be assigned to the terminal. Thus, when the number of continuously accessed terminals without LTE support capability reaches L1These terminals will then be assigned to SGSN POOL part1Wherein each SGSN is assigned to the SGSN1、SGSN2、SGSN3Number of terminals on is M1、M2、M3。
With the increasing number of the accessed terminals, when the number of the continuously accessed terminals without the LTE support capability reaches K L1When (K is a selection scale factor, K ≧ 1 and K is an integer), these terminals are continuously assigned to the SGSN POOLpart1Wherein each SGSN is assigned to the SGSN1、SGSN2、SGSN3The number of terminals is K M1、K*M2、K*M3。
When the number of the terminals without the LTE support capability of continuous access exceeds K L1These terminals will then be assigned to SGSN POOL part2At each SGSN.
When the number of the terminals without the LTE support capability which are continuously accessed reaches K L1+L2And is allocated to MME at this time1/SGSN4、MME2/SGSN5、MME3/SGSN6Has reached M respectively4、M5、M6The RNC will terminate theseEnd assignment to SGSN POOL part1At each SGSN.
When the number of the terminals without the LTE supporting capability of the continuous access exceeds 2K L1+L2These terminals will then be assigned to SGSN POOL part2At each SGSN.
With the increase of the number of the terminals without the LTE support capability which are continuously accessed, the RNC selects the SGSN for each accessed terminal according to the above mode I.
When the terminal with LTE supporting capability is accessed, the RNC judges the number of the terminals with LTE supporting capability which are connected and accessed, if the number does not exceed K × L2And then RNC according to SGSN POOL part2The weight of each SGSN in the system is from SGSN POOLpart2Wherein the SGSN is selected to be assigned to the terminal. Thus, when the number of the terminals with the LTE support capability of continuous access reaches L2These terminals are assigned to SGSNPOOL part2Wherein the MME is allocated to1/SGSN4、MME2/SGSN5、MME3/SGSN6Number of terminals on is M4、M5、M6。
With the increasing number of the accessed terminals, when the number of the terminals with LTE supporting capability which are continuously accessed reaches K L2These terminals will continue to be assigned to SGSN POOL part (K is the selection scale factor, K ≧ 1 and K is an integer)2Wherein the MME is allocated to1/SGSN4、MME2/SGSN5、MME3/SGSN6The number of terminals is K M4、K*M5、K*M6。
When the number of the terminals with the LTE supporting capability of continuous access exceeds K L2These terminals will then be assigned to SGSN POOL part1At each SGSN.
When the number of the terminals with the LTE supporting capability of continuous access reaches K L2+L1When the temperature of the water is higher than the set temperature,and is now assigned to the SGSN1、SGSN2、SGSN3Has reached M respectively1、M2、M3The RNC will assign these terminals to SGSNPOOL part2At each SGSN.
When the number of the terminals with the LTE supporting capability of continuous access exceeds 2K L2+L1These terminals will then be assigned to SGSN POOL part1At each SGSN.
It can be seen from the above description that, in the embodiment of the present invention, under the SGSN-MME converged POOL networking architecture, an RNC may preferentially select a device supporting an SGSN-MME convergence function for a terminal supporting LTE capability to serve the terminal, which can greatly reduce the probability of changing a serving SGSN after the terminal moves from a 3G network to an LTE network, thereby reducing a large amount of signaling overhead between SGSN offices.
Based on the same technical concept, the embodiment of the invention also provides the RNC.
Fig. 7 is a schematic structural diagram of an RNC according to an embodiment of the present invention. As shown in fig. 7, the RNC may include:
an obtaining unit 71, configured to obtain a long term evolution LTE support capability of a terminal when the terminal accesses;
a determining unit 72, configured to determine, when a terminal accesses, a manner of selecting a serving gprs support node SGSN for the terminal;
a selecting unit 73, configured to select an SGSN for the terminal from an SGSN resource pool according to the LTE support capability of the terminal obtained by the obtaining unit when the determining unit determines that the SGSN is selected for the terminal in a load balancing manner, where the SGSN resource pool includes an SGSN supporting an SGSN-mobility management entity MME fusion function and an SGSN not supporting the SGSN-MME fusion function.
Preferably, the selecting unit 73 is specifically configured to, if the terminal does not have the LTE support capability, preferentially select an SGSN for the terminal in SGSNs that do not support the SGSN-MME fusion function in the SGSN resource pool by using a load balancing manner; and if the terminal has LTE support capability, selecting the SGSN for the terminal in the SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool preferentially by adopting a load balancing mode.
Preferably, the selecting unit 73 is specifically configured to, if the terminal does not have the LTE support capability, perform an operation according to a first formula, where the first formula is: n is a radical of1=n1mod(K*L1+L2) (ii) a If 1 is less than or equal to N1≤K*L1If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool; wherein n is1The value of a first counter is used for counting the continuously accessed terminals without LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2Mod () represents the remainder operation for the sum of the weights of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool.
Preferably, the selecting unit 73 is specifically configured to, if the terminal has LTE support capability, perform an operation according to a second formula, where the second formula is: n is a radical of2=n2mod(K*L2+L1) (ii) a If 1 is less than or equal to N2≤K*L2If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool; wherein n is2The value of a second counter is used for counting the continuously accessed terminals with the LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2The weight of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool is added; mod denotes the remainder operation.
Preferably, the determining unit 72 is specifically configured to determine that the SGSN is selected for the terminal in a load balancing manner if the terminal accesses the network by using the international mobile identity IMEI as the user identifier; or, if the terminal accesses the network by using the international mobile subscriber identity IMSI as the subscriber identity, determining to select the SGSN for the terminal in a load balancing manner.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (4)

1. A method for serving general packet radio service technology support node, SGSN, selection, comprising:
when a terminal is accessed, a Radio Network Controller (RNC) obtains the Long Term Evolution (LTE) support capability of the terminal and determines a mode of selecting an SGSN for the terminal;
if the RNC determines that the load balancing mode is adopted to select the SGSN for the terminal, selecting the SGSN for the terminal from an SGSN resource pool through a first process when the terminal does not have the LTE support capability according to the LTE support capability of the terminal, and selecting the SGSN for the terminal from the SGSN resource pool through a second process when the terminal has the LTE support capability, wherein the SGSN resource pool comprises the SGSN supporting the SGSN-MME fusion function and the SGSN not supporting the SGSN-MME fusion function; wherein,
the first process specifically comprises the following steps:
when the terminal does not have the LTE support capability, operation is carried out according to a first formula, wherein the first formula is as follows: n is a radical of1＝n1mod(K*L1+L2)；
If 1 is less than or equal to N1≤K*L1If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool;
wherein n is1The value of a first counter is used for counting the continuously accessed terminals without LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1Sum of weights, L, for all SGSNs in the SGSN resource pool that do not support the SGSN-MME fusion function2The weight of all SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool is added; mod represents the remainder operation;
the second process specifically comprises the following steps:
when the terminal has LTE support capability, operation is performed according to a second formula, wherein the second formula is as follows: n is a radical of2＝n2mod(K*L2+L1)；
If 1 is less than or equal to N2≤K*L2If not, the RNC selects the SGSN which does not support the SGSN-MME fusion function in the resource pool;
wherein n is2And the value of a second counter, wherein the second counter is used for counting the continuously accessed terminals with the LTE support capability.
2. The method of claim 1, wherein the RNC determining to employ a load balancing approach specifically comprises:
if the terminal accesses a network by taking international mobile identity IMEI as a user identifier, the RNC determines to select SGSN for the terminal in a load balancing mode;
or, if the terminal accesses the network by using the international mobile subscriber identity IMSI as the subscriber identity, the RNC determines to select the SGSN for the terminal in a load balancing manner.
3. A radio network controller, RNC, comprising:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the Long Term Evolution (LTE) support capability of a terminal when the terminal is accessed;
a determining unit, configured to determine, when a terminal accesses, a manner of selecting a serving gprs support node SGSN for the terminal;
a selecting unit, configured to, when the determining unit determines that the SGSN is selected for the terminal in a load balancing manner, select, according to the LTE support capability of the terminal obtained by the obtaining unit, an SGSN from a SGSN resource pool through a first execution procedure when the terminal does not have the LTE support capability, and select an SGSN from the SGSN resource pool through a second execution procedure when the terminal has the LTE support capability, where the SGSN resource pool includes an SGSN supporting an SGSN-mobility management entity MME fusion function and an SGSN not supporting the SGSN-MME fusion function; wherein,
the first process specifically comprises the following steps:
when the terminal does not have the LTE support capability, operation is carried out according to a first formula, wherein the first formula is as follows: n is a radical of1＝n1mod(K*L1+L2)；
If 1 is less than or equal to N1≤K*L1Selecting SGSN which does not support the SGSN-MME fusion function in the resource pool, otherwise, selecting SGSN which supports the SGSN-MME fusion function in the resource pool;
wherein n is1The value of a first counter is used for counting the continuously accessed terminals without LTE support capability; k is a selection scale factor, and K is an integer greater than or equal to 1; l is1For all non-supporting SGSN-MM in SGSN resource poolSum of weights, L, of SGSN of E-fusion function2Mod represents the remainder operation for the sum of the weights of all the SGSNs supporting the SGSN-MME fusion function in the SGSN resource pool;
the second process specifically comprises the following steps:
when the terminal has LTE support capability, operation is performed according to a second formula, wherein the second formula is as follows: n is a radical of2＝n2mod(K*L2+L1)；
If 1 is less than or equal to N2≤K*L2If not, selecting the SGSN which does not support the SGSN-MME fusion function in the resource pool;
wherein n is2And the value of a second counter, wherein the second counter is used for counting the continuously accessed terminals with the LTE support capability.
4. The RNC of claim 3, wherein the determination unit is specifically configured to,
if the terminal accesses a network by taking international mobile identity IMEI as a user identifier, determining to select SGSN for the terminal in a load balancing mode;
or, if the terminal accesses the network by using the international mobile subscriber identity IMSI as the subscriber identity, determining to select the SGSN for the terminal in a load balancing manner.
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