WO2011113207A1

WO2011113207A1 - Method and device for service switch

Info

Publication number: WO2011113207A1
Application number: PCT/CN2010/071152
Authority: WO
Inventors: 钱荣福; 孔令山; 林凌峰; 吕平宝; 韦宇; 汪云华; 马红
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2010-03-19
Filing date: 2010-03-19
Publication date: 2011-09-22
Also published as: CN102656921A

Abstract

To solve the problems in the current Long Term Evolution (LTE) standard that the backhaul link bandwidth and the switch function of a serving gateway are occupied and conversation time delay is too long, etc. because a core network needs to switch conversation services between two parities when the conversation services between two parities managed by the same base station are processed, the present invention provides a method and device for service switch. The core network obtains the information of base stations which a calling party and a called party respectively belong to, and judges whether the calling party and the called party are managed by the same base station. If the calling party and the called party are managed by the same base station, a local switch indication is sent to the same base station. Then the same base station receives the local switch indication from the core network, establishes the local switch of communication services between the calling party and the called party at the base station, and directly sends the communication services sent from the calling party and/or the called party to the opposite party. Thus, there is no need to exchange the communication services with the serving gateway through backhaul links and perform the switch by the serving gateway; therefore, the backhaul link bandwidth and the switch resources of the serving gateway are reduced, and switch time delay is shortened.

Description

Method and device for service exchange

The present invention relates to wireless communications, and more particularly to switching techniques in wireless communications. Background technique

In the current LTE standard, after the service is established, the service data needs to be exchanged through a Serving Gateway (SGW). That is, for both terminals of the communication, the communication services of the calling party and the called party must be served. Gateway. Even in the case where the calling party and the called party belong to the same base station, the local call between them needs to be exchanged by the service gateway for the service data of the local call from the base station. As shown in Figure 1, two backhaul links B1 and B2 between the base station and the serving gateway corresponding to the calling party UE 1 and the called party UE 2 need to be established in the network. The communication service path between the calling party and the called party is: calling party UE 1-base station eNB-serving gateway SGW-base station eNB-called party UE 2.

It can be seen that the existing LTE standard needs to occupy the bandwidth of the backhaul link when processing the local call. And because of the introduction of the backhaul link, the call delay between the calling party and the called party is large. In densely populated areas and in some rural and remote areas, many calls are local calls: Some studies have shown that up to 30% of all calls handled by a Base Station Controller (BSC) are local calls; In the fee analysis, this ratio even reached 60%. Based on the existing LTE standard, the service data of these calls needs to have a base station interact with the serving gateway through the backhaul link, and the service gateway exchanges. It can be seen that the above shortcomings of the existing LTE standard for handling local calls cause a considerable burden on the operator's backhaul link and the service gateway in practical applications, and the user experience of the JU multi-user is also due to the long delay of the call. Not ideal enough. SUMMARY OF THE INVENTION The switch of the service gateway can, and the call delay is too long. According to the first aspect of the present invention, a base station for assisting a base station is provided in a core network based on the LTE standard. And a method for exchanging communication services between a party and a called party, where the method includes the following steps: acquiring information about a base station to which the calling party and the called party belong; according to the calling party and the Determining whether the calling party and the called party are both controlled by the same base station; and when the calling party and the called party are both by the same base station The local exchange indication is sent to the same base station, where the indication is used to indicate that the same base station locally establishes a local exchange of communication services between the calling party and the called party at the base station.

According to a second aspect of the present invention, a method for exchanging communication services between a calling party and a called party that are under the jurisdiction of the base station is provided in a base station based on the LTE standard, and the method includes the following steps. Receiving a local exchange indication from the core network, the indication is used to indicate that the base station establishes a local exchange of the communication service between the calling party and the called party at the base station; and, establishing the primary at the local base station The local exchange of the communication service between the calling party and the called party sends the communication service sent by the calling party and/or the called party directly to the other party.

According to a third aspect of the present invention, a device for assisting a base station to exchange communication services between a calling party and a called party in a terminal management unit of a core network based on the LTE standard is provided, wherein An obtaining unit, configured to acquire information about a base station to which the calling party and the called party belong, and a determining unit, configured to determine, according to information about a base station to which the calling party and the called party belong, Whether the calling party and the called party are both under the jurisdiction of the same base station; and the first transmitter is configured to: when both the calling party and the called party are under the jurisdiction of the same base station, The same base station sends a local exchange indication, where the indication is used to indicate that the same base station locally establishes a local exchange of communication services between the calling party and the called party at the base station.

According to a fourth aspect of the present invention, a device for exchanging communication services between a calling party and a called party that are under the jurisdiction of the base station is provided in a base station based on the LTE standard, and includes: a second receiver, configured to receive a local exchange indication from a terminal management unit of the core network, where the indication is used to indicate that the base station establishes a local exchange of the communication service between the calling party and the called party at the local base station; And performing local exchange of the communication service between the calling party and the called party at the base station, and directly transmitting the communication service sent by the calling party and/or the called party to the other party. In this way, the base station can exchange communication services between the calling party and the called party under the jurisdiction of the base station at the base station, and does not need to exchange the communication service to the service gateway through the backhaul link and exchange by the service gateway, thereby saving bandwidth. And the exchange resources of the service gateway, and shorten the exchange delay.

Preferably, a first radio access bearer between the calling party and the core network, and a second radio access bearer between the core network and the called party are also created in a wireless network. . In this case, when a handover occurs in one of the calling party and the called party, the serving gateway can still communicate with the other party through the radio access bearer with the other party, and the base station eNB can also The radio access bearer communicates with the other party and the service gateway, which has less impact on the communication already in progress. DRAWINGS

The above and other features, objects, and advantages of the present invention will become more apparent from the detailed description of the accompanying drawings.

1 is a schematic diagram of an existing LTE standard for exchanging service data exchange paths in a local call;

2 is a signaling flow for establishing a local exchange at a calling party according to an embodiment of the present invention;

3 is a signaling flow for establishing a local exchange at a called party in accordance with an embodiment of the present invention;

4 is a schematic diagram of an exchange path for processing service data in a local call according to an embodiment of the present invention.

In the figures, the same or similar reference numerals denote the same or similar components. detailed description

Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 4. As shown in FIG. 4, the user equipment UE1 and the user equipment UE2 are governed by the base station eNB. The user equipment UE1 initiates a call to the user equipment UE2, which establishes a local exchange of the user equipment UE1 and UE2 at the base station eNB according to an embodiment of the invention. Prior to this, the user equipment UE1 or UE2 can already be running the service, and no service can be run. As shown in FIG. 2, first, the user equipment UE1 accesses the base station eNB through a random access procedure. Then, the user equipment UE1 and the base station eNB exchange RRCConnectionRequest

(RRC Connection Request RRCConnectionSetup and RRCConnectionSetup). Then, in step S10, the second transmitter of the base station eNB will use the INITIAL UE MESSAGE for accessing the user equipment UE1. The (initial UE message) signaling is sent to a Mobility Management Entity (MME) in the core network, which is mainly responsible for control plane signaling interaction. The first receiver of the mobility management entity receives the INITIAL in step S20. UE MESSAGE (initial UE message) signaling. The signaling interactions during these call setup procedures are well known to those of ordinary skill in the art and will not be described again.

In step S10, the second transmitter of the base station eNB is at INITIAL UE MESSAGE

(Initial UE message) The identifier of the own base station eNB to which the user equipment UE1 belongs is sent to the mobility management entity. In step S20, the first receiver of the mobility management entity receives the identity of the base station eNB to which the user equipment UE1 belongs, which is transmitted by the base station eNB. The mobility management entity saves the identity of the base station eNB to which the user equipment UE1 belongs.

After that, NAS information is transmitted in the network.

Then, the mobility management entity transmits an INITIAL CONTEXT SETUP REQUEST signaling for indicating context information such as call QoS to the base station eNB. The base station eNB interacts with the user equipment UE1 with RRCConnectionReconfiguration (RRC Connection Reset) signaling and RRCConnectionReconfigurationComplete (RRC ^^ ^ ^ 4 4 command. After that, NAS information transmission is performed in the network. Subsequently, the base station eNB will INITIAL CONTEXT SETUP RESPONSE (initial context) The establishment response is signaled back to the mobility management entity.

Next, the mobility management entity will establish an E-RAB SETUP REQUEST for the E-UTRAN Radio Access Bearer (E-RAB) between the user equipment UE1 and the serving gateway SGW. The request) signaling is sent to the base station eNB. The base station eNB interacts with the user equipment UE1 RRCConnectionReconfiguration (RRC Connection Reconfiguration) signaling and

Replacement page (Article 26) RRCConnectionReconfigurationComplete (RRC Connection Reconfiguration Complete J Signaling. Thereafter, the base station eNB creates the E-RAB and will indicate whether the E-RAB is successfully created. The radio access bearer creates a response E-RAB SETUP RESPONSE (E-RAB Setup Response) The signaling is sent back to the mobility management entity. Thereafter, the NAS information transmission is performed in the network. At this time, the E-RAB between the user equipment UE1 and the serving gateway SGW has been established. The E-RAB is hereinafter referred to as the calling E- RAB, as in Figure 4, the E-RAB includes a backhaul link B1.

The signaling interactions in the above call establishment process are well known to those of ordinary skill in the art and will not be described here.

Coming to Figure 3, the mobility management entity interacts with the user equipment UE 1 for NAS information. The UID of the user equipment UE2 is queried at the Home Subscriber Server (HSS) based on the mobile phone number of the called party user equipment UE2.

Then, the mobility management entity sends a paging message to each base station, including the base station eNB, under its jurisdiction to find the user equipment UE2 of the corresponding UID. After receiving the paging message sent by the mobility management entity for the user equipment UE2, the base station eNB broadcasts a paging message within the jurisdiction of the base station, and the paging message is received by the user equipment UE2.

Thereafter, the user equipment UE2 accesses the base station eNB through a random access procedure. Then, the user equipment UE2 and the base station eNB exchange RRCCotent ctionRequest (RRC Connection Request λ RRCConnectionSetup (RRC Connection Setup) and RRCConnectionSetup (RRC Connection Setup Complete) At. Then, in step S12, the second transmitter of the base station eNB uses The INITIAL UE MESSAGE signaling to the access user equipment UE2 is sent to the mobility management entity. In step S22, the first receiver of the mobility management entity receives the INITIAL UE MESSAGE (initial UE message) signaling. The signaling interactions during these call setup procedures are well known to those of ordinary skill in the art and will not be described again.

In step S12, the first transmitter of the base station eNB sends the identity of the base station eNB to which the user equipment UE2 belongs in the INITIAL UE MESSAGE message to the mobility management entity. In step S22, the first receiver of the mobility management entity receives the identity of the base station eNB to which the user equipment UE2 belongs, which is transmitted by the base station eNB.

5

Replacement page (Article 26) Then, the judging unit of the mobility management entity judges whether the calling party user equipment UE 1 and the called party user equipment UE2 are both under the jurisdiction of the same base station. For example, it determines whether the identity of the base station eNB to which the user equipment UE2 belongs is the same as the identity of the base station eNB to which the previously stored user equipment UE1 belongs. In this embodiment, the mobility management entity determines that both the calling party user equipment UE1 and the called party user equipment UE2 are under the jurisdiction of the same base station eNB.

After that, NAS information is transmitted in the network.

Then, the mobility management entity transmits an INITIAL CONTEXT SETUP REQUEST signaling for indicating context information such as call QoS to the base station eNB. The base station eNB interacts with the user equipment UE2 with RRCConnectionReconfiguration (RRC Connection Reconfiguration) signaling and RRCConnectionReconfigurationComplete (RRC ^^^^J signaling. Thereafter, NAS information transmission is performed in the network. Subsequently, the base station eNB will INITIAL CONTEXT SETUP RESPONSE (initial context establishment) The response) signaling is sent back to the mobility management entity.

Next, in step S26, the mobility management entity will use an E-RAB SETUP REQUEST (E-RAB SETUP REQUEST) for establishing an Enhanced Radio Access Bearer (E-RAB) between the user equipment UE2 and the serving gateway SGW. - RAB setup request) Signaling is sent to the base station eNB. In step S14, the base station eNB receives the E-RAB SETUP REQUEST signaling. The base station eNB interacts with the user equipment UE2 with RRCConnectionReconfiguration signaling and RR CConnectionReconfigurationComple (the RRC connection reconfiguration complete X command. Thereafter, in step S16, the base station eNB creates the E-RAB and will use A radio access bearer creation response E-RAB SETUP RESPONSE signaling indicating whether the E-RAB is successfully created is sent back to the mobility management entity, and the mobility management entity receives the E-RAB SETUP RESPONSE in step S28 ( E-RAB establishes response) signaling. Thereafter, NAS information transmission is performed in the network. At this time, the E-RAB between the user equipment UE2 and the serving gateway SGW has been established. Hereinafter, the E-RAB is referred to as called E-RAB, as shown in Figure 4, the E-RAB includes a backhaul link B2. The signaling interactions during these call setup procedures are well known to those of ordinary skill in the art and will not be described again.

6

Replacement page (Article 26) Specifically, in step S26, the mobility management entity stores a local exchange indication in the E-RAB SETUP REQUEST signaling to the base station eNB to indicate that the base station eNB establishes the calling party locally at the base station. Local exchange of communication traffic between UE1 and called party UE2. To facilitate the base station eNB to determine the calling party and the communication service, in one embodiment, the local exchange indication includes the identity of the calling party UE1 and the identity of the calling E-RAB. Table 1 below shows the E-RAB SETUP REQUEST signaling, and the IE (bold representation) used as the local exchange indication defined in this embodiment included therein.

Table 1

When the mobility management entity instructs the base station eNB to perform local exchange, the E-RAB SETUP REQUEST signaling includes a local exchange indication IE and a local exchange E-RAB information IE: in the local exchange indication IE, mandatory Including the identity of the calling party UE1 (calling eNB UE S1AP ID), optionally including the identity of the base station eNB (caller global

Replacement page (Article 23) eNB ID); In the Local Exchange E-RAB Information IE, the identity of the calling E-RAB (Caller E-RAB ID) is necessarily included. The base station eNB determines to locally exchange the calls of the calling party UE1 and the called party UE2.

Then, the base station eNB establishes local exchange of communication services of the calling party UE1 and the called party UE2 at the own base station. As shown in the lower part of FIG. 2 and FIG. 3, after receiving the communication service sent by the UE1 and/or the UE2 to the other party, the base station eNB can directly send the communication service to the other party, thereby avoiding the interaction of the communication service through the backhaul link. The serving gateway SGW is exchanged by the serving gateway SGW, which saves the bandwidth of the backhaul link and the switch capability of the serving gateway SGW, and shortens the switching delay. It can be understood that the communication service of the calling party UE1 and the called party UE2 in the base station eNB can be performed in each protocol layer of the protocol stack, which is not described here.

The E-RAB SETUP RESPONSE (E-RAB Establishment Response) signaling sent by the base station eNB in step S16, including the IE (in bold) indicating whether the local exchange is successfully established, as defined in this embodiment, is as shown in Table 2 below. Show.

Table 2

In the case that the base station eNB does not support local switching, it does not establish a local exchange, and does not include in the E-RAB SETUP RESPONSE signaling it transmits.

8 Rule 2δ) The identity is; when the base station eNB supports the local exchange, but for some reasons, for example, the local switch can be insufficient and the local exchange is not established, the identifier value is false; when the base station eNB supports the local exchange and successfully establishes the local exchange, The identity value is true.

In this embodiment, the existing E-RAB SETUP REQUEST signaling and E-RAB SETUP RESPONSE signaling are utilized, and a new local exchange is added therein. Several IEs. It will be appreciated that this embodiment is preferred and not required. Information exchange related to local exchange can be performed between the mobility management entity and the base station through other signaling.

In the above process, in the case where the local exchange is established, the mobility management entity retains all the user plane information allocated to the relevant E-RABs of the user equipments UE1 and UE2. From the perspective of the core network, that is, from the perspective of the mobility management entity and the serving gateway, the radio access bearers between the user equipment UE1 and UE2 and the serving gateway respectively still exist. The base station eNB also retains the user plane information of the SGW in the UE context of the user equipments UE1 and UE2. This means that the base station eNB and the serving gateway can still exchange service data by returning links B1 and B2. When the calling party UE1 and the called party UE2 switch, the service gateway can still pass the other party. The inter-radio access bearer interacts with the other party to exchange communication between the calling party and the called party, and the base station eNB is also capable of interacting between the calling party and the called party based on the radio access bearer and the other party and the serving gateway. Communication business. It will be appreciated that this embodiment is preferred and not required. The radio access bearer may not be established between the calling party or the called party and the core network. While the invention has been illustrated and described with reference to the particular embodiments

Other variations to the disclosed embodiments can be understood and effected by those skilled in the <RTIgt; In the claims, the <RTIgt; "comprising"</RTI> does not exclude other elements and steps, and the word "a" does not exclude the plural. In the practical application of the invention, a part may perform the functions of the plurality of technical features recited in the claims. Any reference signs in the claims should not be construed as limiting the scope.

Replacement page (Rules 2S)

Claims

Claim

A method for exchanging communication services between a calling party and a called party in a core network based on the LTE standard, wherein the method includes the following steps:

Obtaining information of a base station to which the calling party and the called party each belong;

Determining, according to the information of the base station to which the calling party and the called party belong, whether the calling party and the called party are both under the jurisdiction of the same base station;

Transmitting a local exchange indication to the same base station when the calling party and the called party are both managed by the same base station, the indication is used to indicate that the same base station locally establishes the primary at the base station Local exchange of communication services between the calling party and the called party.

The method according to claim 1, wherein the acquiring step receives user equipment messages respectively sent by the base station to which the calling party and the called party belong, and each message respectively includes the main message The identifier of the base station to which the called party and the called party belong; after receiving the user equipment message sent by the base station to which the calling party belongs, the method further includes the following steps:

a method of creating a first radio access bearer between the calling party and the core network; after receiving the user equipment message sent by the base station to which the called party belongs, the method further includes the following steps:

b. Creating a second radio access bearer between the core network and the called party.

3. The method according to claim 2, further comprising the steps of: - interacting with the calling party to identify the called party and the calling party based on the first radio access bearer Communication between the party and the called party; and/or

- based on the second radio access bearer, interacting with the called party with the identity of the calling party and the communication service between the calling party and the called party.

The method according to claim 2, wherein the step b sends a radio access bearer creation request for creating the second radio access bearer to the same base station, where the request includes The local exchange indication includes the identifier of the calling party and an identifier of the first radio access bearer.

5. The method according to claim 4, wherein the method further comprises the steps of:

And receiving, from the same base station, a radio access bearer creation response indicating whether the second radio access bearer is successfully created, and the response includes status information indicating whether the local exchange is successfully established.

A method for exchanging communication services between a calling party and a called party that are under the jurisdiction of the base station in a base station based on the LTE standard, where the method includes the following steps:

Receiving a local exchange indication from the core network, the indication is used to indicate that the base station establishes a local exchange of the communication service between the calling party and the called party at the base station;

- Establishing a local exchange of the communication service between the calling party and the called party at the base station, and directly transmitting the communication service sent by the calling party and/or the called party to the other party.

7. The method according to claim 6, wherein the method further comprises the steps of:

Transmitting, to the core network, user equipment messages of the calling party and the called party, respectively, each message containing an identifier of the base station;

After the user equipment message of the calling party is sent to the core network, the method further includes the following steps:

The first radio access bearer between the calling party and the core network is created. After the user equipment message of the called party is sent to the core network, the method further includes the following steps:

Ii. Create a second radio access bearer between the core network and the called party.

8. The method according to claim 7, wherein the method further comprises the steps of:

- interacting with the calling party and the core network to identify the identity of the called party and the communication service between the calling party and the called party based on the first radio access bearer; and / Or

- interacting with the called party and the core network to identify the identity of the calling party and the communication service between the calling party and the called party based on the second radio access bearer.

9. The method according to claim 7, wherein the step ii is invasive Before the second radio access bearer is received, receiving a radio access bearer creation request for creating the second radio access bearer from the core network, where the request includes the local exchange indication, the indication The identifier of the calling party and the identifier of the first radio access bearer are included in the identifier;

The establishing step establishes the local exchange according to the identity of the calling party and the identity of the first radio access bearer.

10. The method according to claim 9, wherein the method further comprises the following steps:

Transmitting, to the core network, a radio access bearer creation response indicating whether the second radio access bearer is successfully created, the response including status information indicating whether the local exchange is successfully established.

A device for exchanging communication services between a calling party and a called party in a terminal management unit of a core network based on the LTE standard, wherein:

An obtaining unit, configured to acquire information about a base station to which the calling party and the called party belong;

a judging unit, configured to determine, according to information of the base station to which the calling party and the called party belong, whether the calling party and the called party are both under the jurisdiction of the same base station;

a first transmitter, configured to send a local exchange indication to the same base station when both the calling party and the called party are under the jurisdiction of the same base station, the indication being used to indicate that the same base station is The base station locally establishes a local exchange of communication services between the calling party and the called party.

The device according to claim 11, wherein the acquiring unit comprises a first receiver, configured to receive a user equipment message separately sent by a base station to which the calling party and the called party belong, Each message includes an identifier of a base station to which the calling party and the called party respectively belong;

The device also includes:

- a first processing unit, for:

After receiving the user equipment message sent by the base station to which the calling party belongs, creating a first radio access bearer between the calling party and the core network; and After receiving the user equipment message sent by the base station to which the called party belongs, the second wireless access between the core network and the called party is created.

A device for exchanging communication services between a calling party and a called party that are under the control of the base station in a base station based on the LTE standard, including:

a second receiver, configured to receive a local exchange indication from a terminal management unit of the core network, the indication being used to indicate that the base station establishes a local exchange of the communication service between the calling party and the called party at the base station;

a communication unit, configured to establish a local exchange of the communication service between the calling party and the called party at the base station, and directly send the communication service sent by the calling party and/or the called party to the other party .

The device according to claim 13, further comprising:

a second transmitter, configured to send, to the core network, user equipment messages of the calling party and the called party before the second receiver receives the local switching indication, where each message includes a message The identity of the base station;

- a second processing unit, for:

After transmitting the user equipment message of the calling party to the terminal management unit, creating a first radio access bearer between the calling party and the core network; and

After the user equipment message of the called party is sent to the core network, a second radio access bearer between the core network and the called party is created.