WO2011153870A1 - Système, procédé et station de base pour implémenter une transmission de commutation locale - Google Patents

Système, procédé et station de base pour implémenter une transmission de commutation locale Download PDF

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Publication number
WO2011153870A1
WO2011153870A1 PCT/CN2011/072874 CN2011072874W WO2011153870A1 WO 2011153870 A1 WO2011153870 A1 WO 2011153870A1 CN 2011072874 W CN2011072874 W CN 2011072874W WO 2011153870 A1 WO2011153870 A1 WO 2011153870A1
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Prior art keywords
bts
forwarding
destination
port number
address
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PCT/CN2011/072874
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English (en)
Chinese (zh)
Inventor
赵井军
钱鹏飞
徐卫
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中兴通讯股份有限公司
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Publication of WO2011153870A1 publication Critical patent/WO2011153870A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/085—Mobility data transfer involving hierarchical organized mobility servers, e.g. hierarchical mobile IP [HMIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to the field of telecommunications, and more particularly to systems, methods, and base stations for implementing local switched transmissions.
  • E1/T1 cables In traditional telecommunication networks, most of the transmission networks are E1/T1 cables. E1/T1 cables provide high transmission quality and ensure stable transmission delay and transmission jitter.
  • the commercial base station (Base Transceiver Station, BTS) also supports the El/Tl ABIS/IUB port directly connected to the Base Station Controller (BSC)/Radio Network Controller (RNC), or through El. /Tl cascading ways to connect to each other.
  • BSC Base Station Controller
  • RNC Radio Network Controller
  • the newly developed BTS is an all-IP architecture, which uses the IP OVER El/Tl.
  • multiple BTSs are exclusively used in time slots, that is, each cascaded BTS uses part of the time slot resources of the E1/T1 cable, as shown in Figure 1.
  • BTS A, BTS B, BTS C and BTS D are cascaded base stations, the first pair of El/Tl cables of base station A are directly connected to the BSC, and the base stations A, B, C and D respectively use the pair of E1/T1 Part of the time slot resources of the cable and BSC communication, there is no link communication between the base stations.
  • the BSC needs to forward the data of both parties to the core network (Core Network, CN) for exchange.
  • Core Network, CN Core Network
  • each BTS uses exclusive time slots and BSC communication. There is no link between BTSs, and data exchange between them cannot be completed. Local exchange function cannot be realized. How to implement the local switching function in this networking environment, you must change the existing transmission switching method.
  • the technical problem to be solved by the present invention is to provide a system and method for realizing local exchange transmission in an E1/T1 cascade base station environment, thereby saving transmission cost of the ABIS interface and the A interface, and reducing Less voice transmission delay.
  • the present invention provides a system for implementing local switched transmission, the system comprising: a base station controller (BSC) and a plurality of base stations (BTSs) supporting E1 or T1 access capabilities, the BSC and the The plurality of BTSs in the BSC belong to a local switching group, where: the BSC is set to: store link information in the local switching group; and after receiving the call service, determine the calling terminal and the called party of the calling service When the BTS to which the terminal belongs belongs to the same local exchange group, the BTS to which the calling terminal and the called terminal belong are notified to perform intra-group forwarding.
  • the BTS includes: a first module, which is configured to: When the source BTS or the destination BTS is received, the packet forwarding module is triggered after receiving the intra-group packet forwarding notification sent by the BSC;
  • a second module configured to: when the BTS is a BTS participating in a call service, triggering the message forwarding module after receiving a call service message; and a message forwarding module, configured to: according to pre-configured data
  • the forwarding relationship table completes forwarding of the packet related to the call service, and the data forwarding relationship table stores link information of the BTS to the upper node and to all the lower nodes.
  • the link information in the data forwarding relationship table includes: an upper node connected to the BTS and an IP address, a link identifier, and a link direction information of all the subordinate nodes;
  • the packet forwarding module includes: a matching unit, The setting is: matching the destination IP address of the packet to be forwarded with the IP address of the lower node in the data forwarding relationship table saved by the BTS, and if there is a match, triggering the downlink forwarding unit; if there is no match, The uplink forwarding unit is triggered; the downlink forwarding unit is configured to: complete the " ⁇ text forwarding" on the link indicated by the link identifier corresponding to the IP address; and the uplink forwarding unit, which is configured to: send the packet to The upper node in the data forwarding relationship table.
  • the BSC is further configured to: save carrier frequency information of all BTSs in the local switching group, and configure a unique local switching port number for each carrier frequency of each BTS in the local switching group, or in the source BTS During the intra-group forwarding process with the destination BTS, the local switching port number is configured for the source BTS and the destination BTS, respectively.
  • the text forwarding module further includes: constructing a message unit, which is configured to: change the destination IP address of the packet to be forwarded to the IP address of the destination BTS, and change the source user data packet protocol port number to the BTS.
  • the local exchange port number is changed to the destination switch port number of the destination BTS, and the constructed packet is sent to the matching unit.
  • the connection between the BSC and the multiple BTSs in the BSC belongs to a local exchange group: the BSC is connected to at least one intra-group BTS, and the BTS is connected by a daisy chain, and the upper BTS is directly connected.
  • the BSC is connected, and the other BTSs are connected in pairs; a point-to-point protocol link or a multi-link point-to-point protocol link is established between each two connected BTSs and between the uppermost BTSs and the BSCs.
  • the present invention further provides a base station, comprising: a first module, configured to: when the base station (BTS) is used as a source BTS or a destination BTS of a call service, receiving the BSC
  • the second module is configured to: when the BTS is a BTS participating in the call service, triggering the message forwarding module after receiving the call service message
  • the packet forwarding module is configured to: forward the packet related to the call service according to the pre-configured data forwarding relationship table, where the data forwarding relationship table stores the BTS to the superior node and to all the subordinates. Link information of the node.
  • the link information in the data forwarding relationship table includes: an IP address, a link identifier, and a link direction information of an upper node connected to the BTS and all the subordinate nodes
  • the packet forwarding module includes: a matching unit, configured to: match a destination IP address of the file to be forwarded with an IP address of a lower node in a data forwarding relationship table saved by the BTS, and if there is a match, trigger a downlink forwarding unit; if there is no match
  • the item is triggered by the uplink forwarding unit, and the downlink forwarding unit is configured to: complete the " ⁇ text forwarding" on the link indicated by the link identifier corresponding to the IP address; and the uplink forwarding unit, which is set to:
  • the packet forwarding module further includes: a message unit that is configured to be connected to the matching unit, where the configured message unit is set to: 4 to be forwarded Change the destination IP address of the message to the IP address of the destination BTS, change the source user packet protocol port number to
  • the present invention also provides a method for implementing local exchange transmission, the party The method includes: after receiving the call service, the base station controller (BSC) determines, according to the link information in the saved local exchange group, that if the source base station (BTS) and the destination BTS of the call service belong to the same local exchange group, notify the source BTS.
  • BSC base station controller
  • the source BTS and the destination BTS complete forwarding of the packet related to the call service according to the pre-configured data forwarding relationship table, or And the source BTS and the destination BTS cooperate with other related BTSs in the local switching group to complete forwarding of the packet related to the call service according to the pre-configured data forwarding relationship table, where the BTS is saved in the data forwarding relationship table.
  • the link information in the data forwarding relationship table includes: an upper node connected to the BTS and an IP address, a link identifier, and a chain of all the lower nodes.
  • the path direction information includes: the step of the BTS performing the forwarding of the packet related to the call service according to the pre-configured data forwarding relationship table includes: : The IP addresses of the lower nodes in the relationship table are matched. If there is a match, step (b) is performed. If there is no match, step (c) is performed;
  • the method further includes: the BSC retains carrier frequency information of all BTSs in the local switching group; the BSC pre-configures a unique local switching port number for each carrier frequency of each BTS in the local switching group, or The source BTS and the destination BTS configure a local exchange port number for the source BTS and the destination BTS, respectively, in the process of performing the "3 ⁇ 4" forwarding in the group.
  • the source BTS and the destination BTS perform packets related to the call service.
  • the process of configuring the local switching port number for the source BTS and the destination BTS respectively includes: the source BTS changes the destination IP address of the packet to be forwarded to the IP address of the destination BTS, and the source user data packet protocol The port number is changed to the local switch port number of the BTS, and the destination user data packet protocol port number is changed to the local switch port number of the destination BTS.
  • the purpose of the message to be forwarded is Change the IP address to the IP address of the source BTS, change the source user packet protocol port number to the local switch port number of the BTS, and change the destination user packet protocol port number to the source. Local exchange port number of the BTS.
  • the present invention provides a system, method and base station for implementing local switched transmission.
  • a daisy-chain connection is preferably used between base stations, and local exchange transmission is implemented in this manner.
  • the invention fully utilizes the characteristics of the IP OVER E1/T1 to realize a local switching system in the E1/T1 access mode, which greatly saves the transmission cost and improves the voice quality.
  • the solution is simple to implement, versatile, and provides flexible local switched transport.
  • FIG. 1 is a schematic diagram of a physical connection of an El concatenated base station
  • FIG. 2 is a schematic diagram of a system for implementing local exchange transmission according to the present invention
  • FIG. 3 is a schematic diagram of a base station according to the present invention
  • Figure 5 is a flow chart of packet forwarding according to the data forwarding relationship table of the present invention
  • Figure 6 is a format of a user plane packet used by the present invention
  • Figure 7 is a schematic diagram of exchange of user plane messages between base stations according to the present invention
  • FIG. 8 is a schematic diagram of an application example of a system for implementing local switched transmission according to the present invention.
  • the system for implementing local exchange transmission in the E1/T1 (referred to as E1 or T1) cascading environment of the present invention, as shown in FIG. 2, includes: a BSC and multiple BTSs, where the BSC is configured with a local switching group, The BSC and the plurality of BTSs under the BSC belong to a local switching group, and store link information of all BTSs in the local switching group and carrier frequency information of each BTS.
  • the BSC is configured to: after receiving the call service, when determining that the BTS to which the calling and called terminals of the call service belong belong to the same local exchange group, notify the BTS to which the calling and called terminals belong to perform the group forwarding; When the BTS to which the calling and called terminals of the calling service belong do not belong to the same local switching group, the user still exchanges the user plane packets through the core network and performs services according to the original process.
  • the BSC is further configured to: in advance, configure a unique local exchange port number for each carrier frequency of each BTS in the local switching group for identifying the carrier frequency.
  • the BSC configures a User Datagram Protocol (UDP) port number for each carrier frequency of each BTS in the local switching group, and an IP address of the BTS where the carrier frequency is located, and the BTS configures the UDP port according to the configuration. No., the IP address of the BTS where the carrier frequency is located, and the data forwarding relationship table to complete the forwarding of the user plane message; or the BSC in the process of forwarding the source BTS and the destination BTS in the group, respectively, the source BTS and the destination BTS Configure the local switch port number.
  • the identification carrier frequency may also use other methods, for example, may use other custom fields in the IP packet payload for identification, or use other transport layer and field identifiers in the application layer protocol. .
  • BTS hardware supports E1/T1 access capability, and supports E1/T1 time slot data extraction and processing functions; BTS can use daisy chain connection, the upper BTS is directly connected with BSC, other BTS are connected by two, a loop A two-way point-to-point protocol (PPP) link or a multi-link point-to-point protocol (ML) is established between each two connected BTSs and between the uppermost BTS and the BSC. -PPP) link.
  • PPP point-to-point protocol
  • ML multi-link point-to-point protocol
  • Each BTS in the local switching group is pre-configured with a data forwarding relationship table describing the link information of the BTS to the upper node and to all the lower nodes.
  • Each BTS stores the BSC IP address information, which can be based on the data.
  • the forwarding relationship table and the BSC establish respective control plane channels to complete forwarding of control plane data.
  • each BTS includes: a first module, a second module, and a packet forwarding module
  • the first module is configured to: when the BTS is used as the source BTS or the destination BTS of the call service, the packet forwarding module is triggered after receiving the intra-group packet forwarding notification sent by the BSC; the second module is set to: When the BTS is the BTS that participates in the call service, the packet forwarding module is triggered after receiving the call service packet; the packet forwarding module is configured to: complete the report related to the call service according to the pre-configured data forwarding relationship table. Forwarding, the data forwarding relationship table stores link information of the BTS to the upper node and to all the lower nodes.
  • the link information in the data forwarding relationship table includes: an upper node connected to the BTS and an IP address, a link identifier, and a link direction information of all the lower nodes.
  • the " ⁇ " forwarding module includes: a matching unit, a downlink forwarding unit, and an uplink forwarding unit, where the matching unit is configured to: the destination IP address of the packet to be forwarded and the lower node in the data forwarding relationship table saved by the BTS The IP address matches, if there is a match, the downlink forwarding unit is triggered; if there is no match, the uplink forwarding unit is triggered; the downlink forwarding unit is set to: on the link indicated by the link identifier corresponding to the IP address
  • the packet forwarding unit is configured to: send the packet to the upper node in the data forwarding relationship table.
  • the packet forwarding module further includes a message unit, when the BTS is used as the source BTS or the destination BTS, The configuration message unit is set to: change the destination IP address of the packet to be forwarded to the destination BTS IP address, change the source user data packet protocol port number to the local exchange port number of the BTS, and set the destination user data packet.
  • the protocol port number is changed to the local switch port number of the destination BTS, and the constructed packet is sent to the matching unit.
  • the BTS only performs the forwarding action and will not reconstruct the 4 texts.
  • the present invention also provides a method for implementing local exchange transmission, which is implemented by the above system for implementing local exchange transmission. As shown in FIG. 4, the method includes the following steps:
  • the BSC After receiving the call service, the BSC determines whether the call service meets the local exchange condition according to the link information in the saved local exchange group, that is, determines whether the source BTS and the destination BTS of the call service belong to the same local exchange group, and if not, Then, the process goes to step S20; if yes, the process goes to step S30; S20, the user plane message is exchanged through the core network, the service is performed according to the existing process, and the process ends.
  • the BSC notifies the calling party and the called party according to the carrier frequency information of the calling terminal.
  • the BTS performs intra-group packet forwarding, that is, the source BTS and the destination BTS.
  • the S4, the source BTS, and the destination BTS After receiving the notification of the packet forwarding in the group, the S4, the source BTS, and the destination BTS complete the packet forwarding related to the call service according to the pre-configured data forwarding relationship table, where the BTS is saved in the data forwarding relationship table. Link information to the superior node and to all subordinate nodes.
  • the source BTS and the destination BTS perform the re-establishment of the user plane packet according to the configuration, and complete the forwarding of the user plane packet according to the data forwarding relationship table and the corresponding carrier frequency local exchange port number.
  • the baseband board of the source BTS reconstructs the user plane data format, changes the source UDP port number and the destination UDP port number, and the interface board completes the change of the destination IP.
  • the source BTS changes the destination IP address of the forwarded text. For the destination BTS IP address, change the source UDP port number to the source carrier local switch port number, and change the destination UDP port number to the destination carrier local switch port number, and then send the user plane data directly to the peer BTS. Similarly, the destination BTS also reconstructs the forwarded message as above and sends it to the other party.
  • the link information in the data forwarding relationship table includes: an IP address, a link identifier, and a link direction information of the upper node connected to the BTS and all the lower nodes. Step S40 may specifically include the steps shown in FIG. 5:
  • step S401 The current node matches the destination IP address of the packet to be forwarded with the IP address of the lower node in the data forwarding relationship table saved by the BTS. If there is a match, step S403 is performed, if there is no match, Go to step S402;
  • S402 Send the packet to the upper node in the data forwarding relationship table, and the upper node receives the packet as the current node, and performs step S401;
  • S403 Perform packet forwarding on the link indicated by the link identifier corresponding to the IP address.
  • the BTS interface module of the present embodiment is combined with the baseband board.
  • the interface board is responsible for processing the BTS external interface, such as E1/T1 and Ethernet, and performs internal and external packet forwarding processing.
  • the baseband processing board is responsible for processing specific services. IP communication between the interface board and the baseband board.
  • the interface board processing core uses FREESCALE's MPC8360E, which uses the e500 core with high processing performance and QE (QUICC Engine) protocol processing technology.
  • the QE consists of two 32-bit reduced instruction sets (Reduced Instruction Set Computer). , RISC), complete the data processing of each input/output (I/O) interface.
  • the processing rule of the baseband processing board for the user plane message is: if the current service is a non-local exchange service, the destination of the data packet is a BSC; if it is a local exchange service, the destination is a base station where the target carrier frequency is located.
  • FIG. 7 is a schematic diagram of the exchange of user plane messages between the base station B and the base station D.
  • the BTS internally uses an internal IP address
  • the BTS externally uses an external IP address
  • the interface board completes the internal and external messages. Forwarding.
  • the baseband processing board that serves as the source BTS B changes the source UDP port number to the local exchange port number of the BTS after receiving the notification of the packet forwarding by the BSC.
  • the interface board replaces the destination IP address of the packet to be forwarded (that is, the internal IP address of the interface board) with the external IP address (that is, the IP address of the destination BTS).
  • the baseband processing of the destination BTS changes the source UDP port number to the local switching port number of the BTS, and changes the destination UDP port number to the local switching port number of the source BTS.
  • the board replaces the destination IP address of the packet to be forwarded (that is, the internal IP address of the interface board) with the external IP address (that is, the IP address of the source BTS), and then forwards the packet according to the data forwarding relationship.
  • BTS A, BTS C and BTS A and BTS D and BTS C establish a PPP/ML-PPP link between the two devices.
  • the control plane link between BTS B and BSC must be forwarded by its superior BTS A; the user plane data between BTS B and BTS D must be transferred by BTS A and BTS C hair.
  • each BTS must be configured with the data forwarding relationship of the E1/T1 port. Information that is forwarded through which link of the superior BTS.
  • Figure 2 shows the corresponding IP addresses at both ends of each PPP/ML-PPP link, and the label of each link owned by the BTS.
  • the IP addresses corresponding to the two ends of link 1 of BTS B are: 118.1. 2.1 and 118.1.2.2. According to the structure shown in FIG.
  • the data forwarding relationship table of the BTS A to be configured is as shown in Table 1, and the "link identification” field is the number of the link owned by the BTS, corresponding to a PPP/ML-PPP link;
  • the "IP of the connected node” field is the IP address of all connected BTS or BSC under the link;
  • the "link direction” field is the opposite direction of the link, and the "upstream” is the node to the upper node, "downstream,
  • the data forwarding relationship table of the BTS B to be configured is shown in Table 2.
  • the data forwarding relationship table of the BTS C to be configured is shown in Table 3.
  • the data forwarding relationship table of the BTS D to be configured is configured. As shown in Table 4.
  • Table 1 Table 1
  • Table 4 With the above configuration data, after each BTS is powered on, it can establish its own control plane channel with the BSC.
  • BTS D the link-building packet sent to the destination BSC (IP: 118.1.1.2) is sent through link 1; after receiving the BTS C, query table 3, it is learned that it needs to be forwarded through link 1; BTS After receiving A, look up Table 1 and know that it needs to be forwarded through link 1.
  • the BTS D message arrives at the BSC.
  • the packet sent back by the BSC (destination IP: 118.1.4.1) first arrives at BTS A, and BTS A queries Table 1 and learns that it needs to be forwarded through link 3. After receiving the BTS C, it queries Table 3 and knows that it needs to pass the link.
  • each BTS can establish a control plane channel with the BSC.
  • the BSC can configure the IP address of the source BTS and the destination BTS of the calling terminal, the source carrier frequency and the local switching port number of the destination carrier frequency (that is, the UDP port number) in a static configuration or a dynamic configuration manner.
  • the static configuration is the initial operation of the BTS.
  • the BSC configures a local switching port number for each carrier frequency of each BTS in the local switching group.
  • the BSC guarantees the uniqueness of the local switching port number of all carrier frequencies in a local switching group. In the case where the BTS configuration has not changed, the correspondence does not change.
  • the correspondence between the local carrier port number of the carrier frequency and the IP address of the base station where the carrier frequency is located needs to be configured.
  • the BSC When the dynamic configuration is performed, the BSC notifies the source BTS and the destination BTS of the BTS's IP address and UDP port number. BSC uses dynamic configuration mode to establish or delete user plane data conversion relationships in real time, which can save system resources such as UDP port number and memory.
  • the static configuration is taken as an example.
  • the BTS receives a configuration similar to that shown in Table 5.
  • the BTS combines the data forwarding relationship table to complete the forwarding of user plane data.
  • the data forwarding relationship table of each BTS is configured with the information of the IP address of the direct upper-layer base station and the IP address of all the base stations of the lower-level base station.
  • the "downstream” field matches, if there is a match, it is forwarded on the link corresponding to the "link identity"; if there is no match, the data is sent to the "uplink” link.
  • the topology structure shown in Figure 2 is set.
  • BTS B carrier frequencies 1 and BTS D carrier frequency 2 on the carrier frequency 2 for circuit switching domain (Circuit) Switched Domain, CS) business.
  • CS circuit switching domain
  • BTS B will receive the local exchange configuration information similar to that shown in Table 5 issued by the BSC:
  • BTS D searches for the destination IP address of 118.1.2.1 in the configuration corresponding to the "downstream" field of the data forwarding relationship table shown in Table 4. If there is no match, the "link identifier" corresponding to its "upstream” field is used. 1 corresponding link is sent.
  • the BTS C After receiving the packet, the BTS C searches for the entry with the destination IP address of 118 ⁇ 2.1 in the "downstream" field of the data forwarding relationship table shown in Table 3. If there is no match, the corresponding "upstream” field is used. The link corresponding to "link identifier" 1 is sent.
  • BTS A After receiving the packet, BTS A searches for the entry with the destination IP address of 118 ⁇ 2.1 in the "downstream" field of the data forwarding relationship table shown in Table 1, and the matching is successful, so it is sent on link 2. After receiving the packet, the BTS B finds that the destination IP is the base station, and sends the data to the corresponding carrier frequency according to the destination UDP port number.
  • the control plane channel between the BTS and the BSC is normally established, and the user plane channel from the BTS B carrier frequency 1 to the BTS D carrier frequency 2 is normally established, thereby realizing the local switching function in the E1/T1 networking environment.
  • the BSC can query which link the destination IP address is 118.1.8.1, and after receiving the message, the BSC sends the message to the BTS A'. Similarly, after receiving the message, BTS A searches for the entry IP address 118.1.8.1 in the "downstream" field of the data forwarding relationship table. If the match is successful, the message is sent to BTS B'.
  • the present invention fully utilizes the characteristics of the IP OVER E1/T1 to implement a local switching system in the E1/T1 access mode, which greatly saves transmission costs and improves voice quality.
  • the solution is simple, versatile, and provides flexible local exchange transport.

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Abstract

La présente invention concerne un procédé, un système et une station de base servant à implémenter une transmission de commutation locale. Le procédé consiste à : après la réception d'un service d'appel, si un contrôleur de station de base (BSC) détermine, selon des informations de lien stockées dans un groupe de commutation local, que la station de base (BTS) source et la station de base destination (BTS) dudit service d'appel appartiennent au même groupe de commutation local, alors le BSC avise la BTS source et la BTS destination d'effectuer un acheminement de messages dans le groupe ; après la réception de l'avis d'effectuer un acheminement de messages dans le groupe, lesdites BTS source et BTS destination implémentent, selon la table préconfigurée de relation d'acheminement de données, l'acheminement des messages relatifs au dit service d'appel, ou lesdites BTS source et BTS destination coopèrent avec d'autres BTS concernées dans le groupe de commutation local pour implémenter, selon la table préconfigurée de relation d'acheminement de données, l'acheminement des messages relatifs au dit service d'appel. La présente invention réduit fortement les coûts de transmission et améliore la qualité vocale.
PCT/CN2011/072874 2010-06-11 2011-04-15 Système, procédé et station de base pour implémenter une transmission de commutation locale WO2011153870A1 (fr)

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