WO2006056127A1 - Systeme de reseau d'acces radio et procede pour la realisation d'un transfert - Google Patents

Systeme de reseau d'acces radio et procede pour la realisation d'un transfert Download PDF

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Publication number
WO2006056127A1
WO2006056127A1 PCT/CN2005/001987 CN2005001987W WO2006056127A1 WO 2006056127 A1 WO2006056127 A1 WO 2006056127A1 CN 2005001987 W CN2005001987 W CN 2005001987W WO 2006056127 A1 WO2006056127 A1 WO 2006056127A1
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WO
WIPO (PCT)
Prior art keywords
protocol stack
access device
decision point
source
radio
Prior art date
Application number
PCT/CN2005/001987
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English (en)
French (fr)
Inventor
Bing Xu
Jiayi Zhang
Xingang Liang
Yongfeng Deng
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2006056127A1 publication Critical patent/WO2006056127A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface
    • H04W36/144Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443Reselecting a network or an air interface over a different radio air interface technology between licensed networks

Definitions

  • the present invention relates to the field of radio access network technologies in wireless communications, and in particular, to a radio access network system and a method for implementing the same. Background of the invention
  • FIG. 1 is a radio access network system in a wireless network in the prior art.
  • the radio access network is composed of one or several Radio Network Gateways (R Gs), one or several base stations Node B, and the RNG and the Node B are in a many-to-many connection relationship.
  • R Gs Radio Network Gateways
  • Node B base stations
  • Node B base stations
  • the RNG and the Node B are in a many-to-many connection relationship.
  • each figure of the present invention includes only one RNG and two Node Bs.
  • the RG 101 is connected to the core network (CN, Core Network) 100 through the Iu interface, the RNG 101 and the Node B 102 ⁇ Node B 103 are connected through the Iu interface, and the Node B 102 and the Node B 103 can communicate with the UE through the radio link.
  • the communication between the Node B 102 and the Node B 103 is connected through the Iur interface; and the User Equipment (UE) 104 can access the Node B.
  • UE User Equipment
  • the RNG 101 can only perform functions such as system broadcast, paging, and forwarding of RANAP/RNSAP messages, and cannot perform operations such as radio resource control and management related to the UE radio interface protocol stack; in contrast, the Node B 102, In addition to the wireless signal spreading, modulation, coding, baseband and RF signal conversion, the Node B 103 can also complete the radio resources related to the UE radio interface protocol stack. Control and management operations.
  • FIG. 2 is a flowchart of performing MDC when the user equipment is switched in the prior art. Includes the following steps:
  • Step 201 The UE periodically receives pilot signals of all cells that it can receive, and transmits a pilot measurement message including the pilot signal to the source cell base station.
  • the source cell base station uses the cell as a target cell, and sends a radio link setup request to the target cell base station, where the request includes a source.
  • the method for the source cell base station to learn whether the pilot signal reaches a certain strength is generally: a pilot signal strength threshold is preset in the source cell base station, and if the strength of the pilot signal exceeds the threshold, the source The cell base station considers that the pilot signal has reached a certain strength.
  • Step 202 The target cell base station that receives the radio link setup request newly allocates a radio channel to the UE according to the channel parameters such as the radio configuration included in the request. After the target cell base station allocates the wireless channel, the channel configuration of the wireless channel is fed back to the source cell base station, and the source cell base station sends an activation set update message to the UE according to the received channel configuration. After receiving the message, the UE saves the message.
  • the active set is updated, that is, the foregoing wireless channel allocated by the target cell to the UE is added to the active set, and the access target base station is a newly allocated wireless channel of the UE.
  • the target cell base station establishes a radio link with the UE. Thereafter, the target cell base station transmits the received UE radio signal to the source cell base station through an interface between itself and the source cell base station.
  • Step 203 The source cell base station performs MDC operation on the UE radio signal received by itself and the UE radio signal sent from the target cell base station, so that the radio signal strength of the UE is improved.
  • Steps 204-205 The source cell base station sends the UE radio signal that completes the MDC operation to the RG. The RG then sends the received completed UE radio signal to the CN.
  • the CN After receiving the above-mentioned UE wireless signal, the CN performs corresponding processing on the signal.
  • the signal is a service request, and the CN allocates corresponding radio resources according to the signal and performs subsequent corresponding operations.
  • FIG. 3 is a schematic diagram of performing MDC in a radio access network in the prior art.
  • the UE 304 accesses the target Node B 303, it maintains a wireless connection with the source Node B 302 and the target Node B 303, respectively.
  • the MDC operation is divided into the following steps:
  • Step a The target Node B 303 sends the received UE 304 radio signal to the source Node B 302 through its interface with the source Node B 302.
  • Step b The source Node B 302 performs an MDC operation on the UE 304 radio signal received by itself and the UE 304 radio signal sent from the target Node B 303, and sends the merged UE 304 radio signal to the RNG 301.
  • Step c The RNG 301 transmits the received UE 304 wireless signal that has been merged to the CN 300.
  • FIG. 4 is a schematic diagram of performing MDC in another wireless access network of the prior art.
  • the "X" between the source Node B 402 and the target Node B 403 indicates that the interface between the source Node B 402 and the target Node B 403 has failed, or the interface does not support the service currently being performed by the UE, such as The above interface cannot meet the bandwidth required for the ongoing service of the UE, so that the source Node B 402 and the target Node B 403 cannot directly communicate with each other.
  • the MDC operation is divided into the following steps:
  • Step a The target No, de B 403 wishes to transmit the received UE 404 radio signal to the source Node B 402 through its interface with the source Node B 402, but since the source Node B 402 and the target Node B 403 cannot each other Direct communication, so the source Node B 402 can only communicate with the target Node B 403 through the RNG 401, that is: the target Node B 403 sends the received UE 404 wireless signal to the RNG 401.
  • Step b The RNG 401 sends the received UE 404 radio signal to the source Node B 402.
  • Step c The source Node B 402 performs an MDC operation on the UE 404 wireless signal received by itself and the UE 404 wireless signal sent from the R G 401, and transmits the completed UE 404 wireless signal to the RNG 401.
  • Step d The RNG 401 transmits the received UE 404 wireless signal that has been merged to the CN 400.
  • the main object of the present invention is to provide a radio access network system, which simplifies the handover procedure in the radio access network, reduces the occupancy rate of the radio transmission resources, and reduces the data transmission delay in the radio access network.
  • Another object of the present invention is to provide a method for implementing handover in a radio access network system, which simplifies a handover procedure in a radio access network, reduces occupancy rate of radio transmission resources, and reduces data transmission delay in a radio access network. .
  • the invention discloses a wireless access network system, and the system comprises:
  • the source user terminal UE accessing device is configured to send a radio interface protocol stack upload request to the protocol stack migration decision point when the UE that maintains the wireless connection with itself, when receiving the radio interface protocol sent from the protocol stack migration decision point After the stack is moved up, the radio interface protocol stack that has been established for the UE is deleted, and the received UE radio signal is sent to the protocol stack migration decision point.
  • a target UE accessing device configured to establish a wireless connection with the UE, and send the received UE wireless signal to the protocol stack migration decision point;
  • the protocol stack migration decision point is connected to the source UE access device and the target UE access device, and is configured to establish an instance of the radio interface protocol stack for the UE after receiving the radio interface protocol stack uplink request, and from the source,
  • the UE radio signal of the target UE access device performs processing including macro diversity combining.
  • the source and target UE access devices are edge wireless stations ERS, and the protocol stack migration decision point is an internet protocol access gateway IAGW, and the IAGW is connected to the ERS through an internet protocol IP network.
  • the source and target UE access devices are base stations, and the protocol stack migration decision point is a wireless network gateway.
  • the invention also discloses a method for implementing handover by a wireless access network system, the method comprising the following steps:
  • a protocol stack migration decision point establishes a wireless interface protocol stack instance for the UE, and controls the source UE access device to delete an instance of the wireless interface protocol stack that was established for the UE when the UE normally communicates;
  • the target UE access device establishes a wireless connection with the UE, and establishes a transmission link with the protocol stack migration decision point, and the source UE access device establishes a transmission link between itself and the protocol stack migration decision point;
  • step a the process of establishing the wireless interface protocol stack instance by the protocol stack migration decision point is:
  • the source UE access device sends a radio interface protocol stack up request for the UE handover to the protocol stack migration decision point, and after the protocol stack migration decision point receives the radio interface protocol stack uplink request, the radio interface protocol stack instance for the UE is established. .
  • the method for the protocol stack migration decision point to control the source UE access device to delete the wireless interface protocol stack instance is:
  • the protocol stack migration decision point sends a radio interface protocol stack uplink response to the source UE access device, and after receiving the uplink response of the radio interface protocol stack, the source UE access device deletes the radio interface protocol stack that it has established for the UE. Example.
  • the method further includes:
  • the source UE access device determines whether the received pilot measurement message sent by the UE includes a pilot signal of the UE access device that reaches a preset strength threshold, and if so, And the UE access device corresponding to the pilot signal is used as the target UE access device, and the radio interface protocol stack uplink request is sent to the protocol stack migration decision point.
  • step a the target UE access device establishes a wireless connection with the UE, establishes a transmission link with the protocol stack migration decision point, and the source UE access device establishes itself to the protocol stack migration decision point.
  • the protocol stack migration decision point sends a transmission link setup request to the source and target UE access devices; and after the source UE access device receives the transmission link setup request, establishes a relationship with the protocol stack migration decision point. a transmission link; after receiving the transmission link setup request, the target UE access device allocates a radio channel to the UE, and establishes a transmission link with the protocol stack migration decision point;
  • the target UE access device After the target UE access device allocates a radio channel to the UE, it sends a transmission link setup response to the protocol stack migration decision point; after the protocol stack migration decision point receives the transmission link setup response, the source UE accesses the device. Sending an active set update command to the UE; after receiving the active set update command, the UE updates the activated set saved by itself and accesses the wireless channel allocated by the target UE access device for the UE.
  • the UE Before the step b, the UE further performs a softer handover softer handover within the signal coverage of the source UE access device and/or the target UE access device; in step b, the source and target UE access device
  • the method for transmitting the UE wireless signal by the protocol stack migration decision point is:
  • the source UE access device and/or the target UE access device perform a softer merge and softer combing on the UE wireless signal received by the UE, and then send the softener combing UE wireless signal to the protocol stack migration decision point.
  • the UE further performs soft handover within the signal coverage of the source UE access device and/or the target UE access device.
  • the source and target UE access devices access the protocol stack.
  • the method for transmitting the UE wireless signal by the migration decision point is: The source UE access device and/or the target UE access device directly transmit the UE wireless signal received by the UE to the protocol stack migration decision point.
  • step b the method further includes:
  • the UE receives the pilot signals of all UE access devices that it can receive, and sends the pilot signals to the protocol stack migration decision point; when the protocol stack migration decision point determines that the pilot signal strength of the UE access device from the UE is reduced to a certain value
  • the UE sends a link release request to the UE access device corresponding to the pilot signal. After receiving the link release request, the UE access device releases the radio resource allocated to the UE.
  • the UE After the UE access device releases the radio resource allocated to the UE, the UE only maintains a wireless connection with one UE access device, and the method further includes the following steps:
  • the protocol stack migration decision point After receiving the downlink response of the radio interface protocol stack, the protocol stack migration decision point deletes the radio interface protocol stack instance that it has established for the UE.
  • the UE access device is a base station, and the protocol stack migration decision point is a wireless network gateway; in step b, after the UE wireless signal processing is completed, the completed UE wireless signal is further sent to the core network.
  • the source UE access device is configured to delete the radio interface protocol stack instance established for the UE, and send the received UE radio signal to the protocol stack migration.
  • a decision point the target UE access device is configured to send the received UE radio signal to the protocol stack migration decision point
  • the protocol stack migration decision point is used to establish a radio interface protocol stack instance for the UE, and connect to the source and target UEs.
  • the UE wireless signal entering the device performs processing including MDC, and the switching process in the radio access network is compressed. Reduce the occupation rate of wireless transmission resources and reduce the data transmission delay in the wireless access network.
  • the method for implementing the handover by the radio access network system when the UE performs the handover, the source UE access device is deleted as the radio established by the UE by the signaling interaction between the source UE access device and the protocol stack migration decision point.
  • An interface protocol stack instance, the protocol stack migration decision point establishes a wireless interface protocol stack instance for the UE; and the target UE access device establishes a wireless connection with the UE; the source and target UE access devices send the received UE wireless signal to
  • the protocol stack migration decision point, the protocol stack migration decision point performs processing including the MDC on the received UE wireless signal, simplifies the handover process in the radio access network, reduces the occupancy rate of the wireless transmission resource, and reduces the radio access. Data transmission delay in the network. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a system diagram of a radio access network in a wireless network of the prior art
  • FIG. 3 is a schematic diagram of performing MDC in a radio access network in the prior art
  • FIG. 4 is a schematic diagram of performing MDC in another radio access network in the prior art
  • FIG. 5 is a preferred embodiment of the present invention.
  • FIG. 6 is a schematic diagram of performing MDC in a radio access network according to a preferred embodiment of the present invention
  • FIG. 7 is a radio access in another wireless network in the prior art. Network system diagram
  • FIG. 8 is a flowchart of performing an MDC when a user equipment is switched according to another preferred embodiment of the present invention.
  • FIG. 9 is a schematic diagram of the handover process of the present invention. Mode for carrying out the invention
  • the source UE access device is used to delete The radio interface protocol stack instance established by the UE, and the received UE radio signal is sent to the protocol stack migration decision point;
  • the target UE access device is configured to send the received UE radio signal to the protocol stack migration decision point;
  • the decision point is used to establish an instance of the radio interface protocol stack for the UE, and performs processing including the MDC on the UE radio signal from the source and target UE access devices.
  • the method for implementing the handover by the radio access network system when the UE performs the handover, the source UE access device is deleted as the radio established by the UE by the signaling interaction between the source UE access device and the protocol stack migration decision point.
  • An interface protocol stack instance, the protocol stack migration decision point establishes a wireless interface protocol stack instance for the UE; and the target UE access device establishes a wireless connection with the UE; the source and target UE access devices send the received UE wireless signal to
  • the protocol stack migration decision point is processed by the protocol stack migration decision point to the received UE wireless signal including MDC.
  • the RNG in the radio access network system of the present invention can perform operations such as control and management of radio resources in addition to functions such as system broadcast, paging, and forwarding of RANAP/RNSAP messages, so that the RNG can still be based on the UE switching. Corresponding requests for related MDC operations.
  • FIG. 5 is a flowchart of performing MDC when a user equipment is switched according to a preferred embodiment of the present invention, where the process includes the following steps:
  • Step 501 The UE periodically receives the pilot signals of all the cells that it can receive, and sends a pilot measurement message including the pilot signal strength to the source cell base station.
  • the source cell base station uses the cell as a target cell, and sends an MDC uplink request to the RNG.
  • the target cell and the source cell are two cells respectively covered by radio signals of different base stations.
  • the uplink request includes a radio interface protocol stack with respect to UE handover in a source cell base station Set information, such as: data transmission format, data transmission rate, whether to retransmit when the data transmission error, etc.; the above uplink request also includes channel parameters such as the wireless configuration of the wireless channel allocated by the source cell base station to the UE.
  • Step 502 After receiving the MDC upload request, the RNG creates a radio interface protocol stack instance for the UE according to the configuration information included in the request, to process the radio resource control and management in the subsequent handover process of the UE. Thereafter, the RNG sends an MDC uplink response to the source cell base station.
  • the RNG When receiving the MDC uplink request, the RNG also sends a transmission link setup request to the source and target cell base stations respectively, requesting the source cell base station to newly establish a transmission link to the RNG; and requesting the target cell base station to establish the UE via the target cell base station to the RNG. Transmission link.
  • Step 503 After receiving the MDC uplink response, the source cell base station deletes the radio interface protocol stack instance that it has established for the UE, so that the source cell base station does not process the radio resource control, management, and the like in the subsequent handover process of the UE.
  • the target cell base station After receiving the transmission link setup request, the target cell base station establishes a transmission link between itself and the RNG, and newly allocates a radio channel for the UE, and then returns a transmission link establishment response to the RNG; the RNG passes the response according to the response.
  • the source base station sends an activation set update command to the UE. After receiving the command, the UE accesses the target cell to the newly allocated radio channel of the UE, and updates the activated set saved by the UE, that is, the wireless device that allocates the target cell to the UE. The channel is added to the above active set.
  • the source cell base station After receiving the transmission link setup request, the source cell base station establishes a transmission link between itself and the RNG.
  • the reason for the source cell base station to establish a transmission link between itself and the RG is: Before the RNG establishes the radio interface protocol stack instance for the UE, the transmission link between the source cell base station and the RG for the UE is based on the Iu interface; After the RNG establishes the radio interface protocol stack instance for the UE, since the RG is to process the UE radio signal from the source cell base station, the Iu interface-based transmission link cannot be used again, which makes The source cell base station needs to establish a transmission link between itself and the RNG, and the transmission link is usually based on the Iub interface.
  • Step 504 After completing step 503, the target cell base station establishes a radio link with the UE, and also establishes a transmission link with the RNG.
  • the target cell base station sends the received UE radio signal to the RNG.
  • the source cell base station establishes a transmission link with the RNG while maintaining a wireless connection with the UE.
  • the source cell base station transmits the received UE radio signal to the R G.
  • Step 505 The R G performs an MDC operation on the received UE radio signal sent from the source and target cell base stations.
  • Step 506 The RNG sends the UE radio signal that completes the MDC operation to the CN.
  • the CN After receiving the above-mentioned UE wireless signal, the CN performs corresponding processing on the signal.
  • the signal is a service request, and the CN allocates corresponding radio resources according to the signal and performs subsequent corresponding operations.
  • the RNG 601 can perform operations such as control and management of radio resources.
  • the source Node B 602 performs the wireless signal expansion in addition to the target Node B 603.
  • it In addition to the conversion of frequency, modulation, coding, baseband signals and RF signals, it also performs operations such as control and management of radio resources.
  • the UE 604 accesses the target Node B 603, it is connected to the source Node B 602.
  • the target Node B 603 maintains a wireless connection, respectively.
  • the source Node B 602 since the source Node B 602 has deleted the radio interface protocol stack instance that it has established for the UE 604, the source Node B 602 does not process the radio resource control, management, and the like in the subsequent handover process of the UE 604.
  • the RNG 601 can process the radio resource control and management in the subsequent handover process of the UE 604 by creating a new radio interface protocol stack instance for the UE.
  • the MDC operation when the UE 604 is switched is divided into the following steps:
  • Step a The source Node B 602 and the target Node B 603 respectively send the radio signals of the UE 604 received by themselves to the R G 601.
  • Step b The RNG 601 performs an MDC operation on the received UE radio signal sent from the source Node B 602 and the target Node B 603, and sends the UE radio signal that completes the MDC operation to the CN 600.
  • the MDC operation in the UE handover process can be completed in only two steps.
  • the UE maintains a wireless connection with the source and target cell base stations, and the target cell base station may be one or more. .
  • FIG. 7 shows the existing A diagram of a wireless access network system in another wireless network.
  • the Internet Protocol (IP) network 730 is connected to an Edge Radio Station (ERS) 740, an ERS 750, and an ERS 760, respectively.
  • the IP network 730 is also associated with an IP Access Gateway (IAGW, IP Access GateWay). 710.
  • IAGW IP Access Gateway
  • IP Access GateWay IP Access Gateway
  • the ERS integrates the base station in the current 3G communication network with a Radio Network Controller (RNC), and can implement a universal wireless communication system radio access network (UTRAN, UMTS Territorial) that can be implemented by the base station and the RNC.
  • RNC Radio Network Controller
  • the Node is integrated with the Gateway General Packet Radio Service Node (GGSN) to implement the functions of the CN that can be implemented by the SGSN and the GGSN.
  • GGSN Gateway General Packet Radio Service Node
  • Each ERS can establish a connection relationship with any one or more IAGWs that are not fixed through the IP network 730.
  • radio interface protocol stack for the UE in the IAGW, that is, a radio interface protocol stack such as PDCP/BMC/RLC/MAC; and like the Node B, there is a UE for the ERS.
  • Wireless interface protocol stack This allows the IAGW to perform functions such as system broadcast, paging, and RANAP/RNSAP message forwarding, and cannot perform operations such as radio resource control and management related to the UE radio interface protocol stack; in contrast, ERS can complete wireless In addition to signal spread spectrum, modulation, coding, baseband signal and RF signal conversion, it can also perform operations such as radio resource control and management related to the UE radio interface protocol stack.
  • Step 801 The source ERS receives the measurement report of the UE, and sends a radio interface protocol stack context up request to the IAGW according to the report.
  • Step 802 The IAGW establishes a radio interface protocol stack instance for the UE according to the radio interface protocol stack context up request from the source ERS, and sends a radio interface protocol stack context up response to the source ERS; and simultaneously sends a handover request to the target ERS.
  • Step 803 The source ERS deletes the radio interface protocol stack instance established by itself as the UE according to the received radio interface protocol stack context shift response, and establishes a transmission link between itself and the IAGW; the target ERS establishes its own transmission chain to the IAGW. Road and between itself and the UE Wireless link. The reason why the source ERS creates its own transmission link to the IAGW is the same as the corresponding reason in step 503.
  • Step 804 The source and target ERS respectively send the UE wireless signal received by the ERS to the IAGWo.
  • the steps 801 to 805 in FIG. 8 are basically the same as the steps 501 to 505 in FIG. 5 respectively, except that the operating entity is changed from R G and CN in FIG. 5 to the ERS and IAGW in FIG. 8 .
  • the functions of the radio interface protocol stack context up request and the radio interface protocol stack context shift response in FIG. 8 are the same as those of the MDC up shift request and the MDC up shift response in FIG. 5, respectively.
  • the wireless interface protocol stack context shift request and the MDC upload request are both for the uplink of the radio interface protocol stack for the UE; the wireless interface protocol stack context shift response and the MDC uplink response are both for continuing Switching process.
  • the base station and the ERS are collectively referred to as a UE access device; the RNG and the IAGW are collectively referred to as a protocol stack migration decision point; and the MDC uplink request and the wireless interface protocol stack context up request are collectively referred to as The wireless interface protocol stack moves up the request; the MDC uplink response and the wireless interface protocol stack context up-shift response are collectively referred to as the wireless interface protocol stack uplink response.
  • the UE When the UE maintains a wireless connection with the source and target UE access devices, it periodically receives the pilot signals of all the UE access devices that it can receive, and migrates the decision point to the protocol stack through the source UE access device. A pilot measurement message containing the pilot signal described above is transmitted.
  • the protocol stack moves When the shift decision point determines that the pilot signal strength of a certain UE access device included in the pilot measurement message from the UE is reduced to a certain extent, the link release request is sent to the UE access device; the UE access device After receiving the link release request, the radio resources allocated for the UE are released.
  • the protocol stack migration decision point sends an activation set update message to the UE, and after receiving the message, the UE updates the activation set of the UE accordingly: deleting the UE access device that is no longer in wireless connection with the UE. logo.
  • the UE may eventually maintain a wireless connection with only one UE access device that can receive the strongest pilot signal, and at this time, only one UE is saved in the active set of the UE.
  • the wireless channel of the access device that is, the wireless link in which only one UE access device exists in the active set.
  • the radio interface protocol stack drop request is sent to the UE access device, and the radio interface protocol stack drop request includes the protocol.
  • the stack migration decision point is configured for the configuration information included in the radio interface protocol stack instance established by the UE, such as: data transmission format, data transmission rate, and whether the data transmission error is retransmitted or the like.
  • the UE access device After receiving the radio interface protocol stack drop request, the UE access device establishes an instance of the radio interface protocol stack for the UE according to the configuration information included in the request, so as to ensure that the subsequent communication operations of the UE can be processed normally. . At the same time, the UE access device sends a radio interface protocol stack down response to the protocol stack migration decision point. After receiving the downlink response of the radio interface protocol stack, the protocol stack migration decision point deletes the radio interface protocol stack instance that it has established for the UE.
  • the UE only keeps connected with the source UE access device through a wireless link.
  • the UE performs softer handover across sectors within the signal coverage of the source UE access device, the UE remains connected to the source UE access device through multiple wireless links.
  • the switching method is compared with the switching method shown in FIG. Some differences. The difference is: when the source UE access device establishes a transmission link with the protocol stack migration decision point; and the target UE access device establishes a radio link with the UE, and after establishing a transmission link with the protocol stack migration decision point
  • the source UE access device first receives the wireless signals sent from the UE through multiple wireless links connected to the UE, and performs softer combing on the wireless signals.
  • the target UE access device maintains the wireless with the UE through multiple wireless links. connection. Then, when the source UE access device establishes a transmission link with the protocol stack migration decision point; and the target UE access device establishes a radio link with the UE, and after establishing a transmission link with the protocol stack migration decision point, the target UE The access device also first receives the wireless signals sent from the UE through multiple wireless links connected to the UE, and then performs soft combing on the wireless signals.
  • the source and/or target UE access device may not perform soft combing on the received UE wireless signals of multiple radio links, but separately send the UE radio signals to the protocol stack migration decision point, by the protocol stack.
  • the migration decision point directly performs subsequent signal processing such as MDC operation on all the received UE wireless signals.
  • the specific signaling procedure is the same as that of the signaling process described in FIG. 5, and details are not described herein again.
  • Step 901 The source UE access device sends a radio interface protocol stack upload request corresponding to the UE to the protocol stack migration decision point.
  • Step 902 After receiving the uplink request of the radio interface protocol stack, the protocol stack migration decision point establishes an instance of the radio interface protocol stack for the UE, and sends a radio interface protocol stack uplink response to the source UE access device.
  • Step 903 After receiving the uplink response of the radio interface protocol stack, the source UE access device deletes the radio interface protocol stack instance that it has established for the UE.
  • the target UE access device establishes a radio connection with the UE, and establishes and protocols.
  • the transmission link between the stack migration decision points, the source UE accesses the transmission link between itself and the protocol stack migration decision point.

Description

一种无线接入网络系统及其实现切换的方法 技术领域
本发明涉及无线通信中的无线接入网络技术领域, 具体涉及一种无 线接入网络系统及其实现切换的方法。 发明背景
随着通信技术的发展, 无线接入网被不断演进, 其中一种演进方式 所得的无线接入网如图 1所示, 图 1为现有技术的一种无线网络中的无 线接入网系统图。其中,无线接入网由一个或几个无线网络网关(R G, Radio Network Gateway )、一个或几个基站 Node B组成, RNG与 Node B 为多对多的连接关系。为方便描述,本发明的各图中均只包含一个 RNG、 两个 Node B。
图 1中, R G 101与核心网 (CN, Core Network ) 100通过 Iu接口 相连, RNG 101与 Node B 102 ^ Node B 103通过 Iu接口相连, Node B 102、 Node B 103可以通过无线链路与 UE通信, Node B 102与 Node B 103之 间通过 Iur接口相连; 并且, 用户终端(UE, User Equipment ) 104可以 接入 Node B。
RNG 101 中 不存在针对 UE 的无线接口 协议栈 , 即 PDCP/BMC/RLC/MAC等无线接口协议栈, 而 Node B 102、 Node B 103 中则存有针对 ΌΈ的无线接口协议栈。这就使得 RNG 101只能完成系统 广播、 寻呼、 RANAP/RNSAP消息的转发等功能, 而不能进行与 UE无 线接口协议栈相关的无线资源控制及管理等操作; 相对而言, Node B 102、 Node B 103除了能完成无线信号扩频、 调制、 编码、 基带信号与 射频信号的转换之外, 还能完成与 UE无线接口协议栈相关的无线资源 控制及管理等操作。
当应用上述无线接入网时, UE切换过程中有关宏分集合并(MDC, Macro Diversity Combine ) 的流程如图 2所示, 图 2为现有技术用户设 备切换时进行 MDC的流程图, 该流程包括以下步骤:
步骤 201 : UE周期性地接收其所能收到的所有小区的导频信号, 并 向源小区基站发送包含上述导频信号的导频测量消息。 当上述导频测量 消息所包含的某个小区的导频信号达到一定强度时, 源小区基站则将所 述小区作为目标小区, 并向该目标小区基站发送无线链路建立请求, 该 请求包含源小区基站为 UE分配的无线信道的无线配置等信道参数。
上述源小区基站获知所述导频信号是否达到一定强度的方法通常 是: 源小区基站内预先设置有一个导频信号强度门限值, 如果上述导频 信号的强度超过了该门限值, 源小区基站则认为该导频信号达到了一定 强度。
步骤 202: 接收到无线链路建立请求的目标小区基站, 根据该请求 包含的无线配置等信道参数为 UE新分配一个无线信道。 目标小区基站 分配完上述无线信道后将该无线信道的信道配置反馈给源小区基站, 源 小区基站根据收到的信道配置向 UE发送激活集更新消息,UE收到该消 息后, 对自身保存的激活集进行更新, 即: 将目标小区为 UE分配的上 述无线信道加入所述激活集中, 并接入目标小区基站为 UE新分配的无 线信道。
这样, 目标小区基站就与 UE建立了无线链路。 之后, 目标小区基 站通过自身与源小区基站间的接口将接收到的 UE无线信号发送给源小 区基站。
步骤 203:源小区基站将自身接收到的 UE无线信号与发自目标小区 基站的 UE无线信号进行 MDC操作,以使 UE的无线信号强度得以提高。 步骤 204-205: 源小区基站将完成 MDC操作的 UE无线信号发送给 R G; R G再将接收到的完成合并的 UE无线信号发送给 CN。
CN收到上述 UE无线信号后, 对该信号进行相应处理。 如: 所述信 号是业务请求, CN则根据该信号分配相应的无线资源并进行后续的相 应操作。
如果将上迷有关 MDC操作融入无线接入网中则如图 3所示, 图 3 为现有技术的一种无线接入网中进行 MDC的原理图。 由图 3可见, 当 UE 304接入目标 Node B 303后, 就与源 Node B 302、 目标 Node B 303 分别保持无线连接。 这时, 有关 MDC操作分为以下步骤:
步骤 a: 目标 Node B 303通过自身与源 Node B 302间的接口将接收 到的 UE 304无线信号发送给源 Node B 302。
步骤 b: 源 Node B 302将自身接收到的 UE 304无线信号与发自目 标 Node B 303的 UE 304无线信号进行 MDC操作,并将完成合并的 UE 304无线信号发送给 RNG 301。
步骤 c: RNG 301将接收到的完成合并的 UE 304无线信号发送给 CN 300。
由图 3中的上述操作和图 2中的操作均可知, 应用现有技术进行切 换时, MDC操作必须由源 Node B 302进行, 这使得过多的系统链路传 输资源被占用,进而加重了源 Node B 302和 CN 300之间、源 Node B 302 和目标 Node B 303之间的传输链路负荷,并且由于这种链路在整个网络 中占的比例很大, 因此这种传输链路负荷的增加对于运营商来说意味着 巨大的投资。
另外, 源 Node B 302进行 MDC操作的方式, 过分依赖于源 Node B 302与目标 Node B 303之间的接口, 如果该接口出现故障, 或是不支持 UE 目前正在进行的业务, UE切换时的有关 MDC操作还会遇到如图 4 所示的问题, 图 4为现有技术的另一种无线接入网中进行 MDC的原理 图。
图 4中, 源 Node B 402与目标 Node B 403之间的 "X"表示源 Node B 402与目标 Node B 403之间的接口出现了故障, 或者这个接口不支持 UE目前正在进行的业务,如: 上述接口无法满足 UE正在进行的业务所 需要的带宽, 致使源 Node B 402与目标 Node B 403彼此之间无法直接 通信。
当 UE 404接入目标 Node B 403后, 就与源 Node B 402、 目标 Node B 403分别保持无线连接。 这时, 有关 MDC操作分为以下步骤:
步驟 a: 目标 No,de B 403希望通过自身与源 Node B 402间的接口将 接收到的 UE 404无线信号发送给源 Node B 402, 但由于源 Node B 402 与目标 Node B 403彼此之间无法直接通信, 所以源 Node B 402只能通 过 RNG 401与目标 Node B 403通信, 即: 目标 Node B 403将接收到的 UE 404无线信号发送给 RNG 401。
步骤 b: RNG 401将接收到的 UE 404无线信号发送给源 Node B 402。 步骤 c:源 Node B 402将自身接收到的 UE 404无线信号与发自 R G 401的 UE 404无线信号进行 MDC操作, 并将完成合并的 UE 404无线 信号发送给 RNG 401。
步驟 d: RNG 401将接收到的完成合并的 UE 404无线信号发送给 CN 400。
由上述操作可见, 当源 Node B 402与目标 Node B 403之间的接口 出现故障时, UE 404切换的 MDC操作过于复杂, 大量的传输资源被浪 费了, 导致传输链路投资成本过高; 过于复杂的 MDC操作还加重了源 Node B 402及 RNG 401的工作负荷,并导致无线接入网产生数据传输时 延。 发明内容
有鉴于此, 本发明的主要目的在于提供一种无线接入网络系统, 以 简化无线接入网中的切换流程, 降低无线传输资源的占用率, 减少无线 接入网中的数据传输时延。
本发明的另一目的在于提供一种无线接入网络系统实现切换的方 法, 以简化无线接入网中的切换流程, 降低无线传输资源的占用率, 减 少无线接入网中的数据传输时延。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明公开了一种无线接入网络系统, 该系统包括:
源用户终端 UE接入设备, 用于在与自身保持无线连接的 UE进行 切换时向协议栈迁移决策点发送无线接口协议栈上移请求, 当接收到发 自协议栈迁移决策点的无线接口协议栈上移响应后, 删除自身曾为 UE 建立的无线接口协议栈实例, 将接收到的 UE无线信号发送给协议栈迁 移决策点;
目标 UE接入设备, 用于同 UE建立无线连接, 并将接收到的 UE无 线信号发送给协议栈迁移决策点;
协议栈迁移决策点, 与源 UE接入设备和目标 UE接入设备相连, 用于在收到无线接口协议栈上移请求后, 建立针对 UE的无线接口协议 栈实例, 并对来自上述源、 目标 UE接入设备的所述 UE无线信号进行 包括宏分集合并在内的处理。
所述源、 目标 UE接入设备是边缘无线站 ERS, 所述协议栈迁移决 策点是网际协议接入网关 IAGW, IAGW通过网际协议 IP网络与 ERS 相连。
所述源、 目标 UE接入设备是基站, 所述协议栈迁移决策点是无线 网络网关。 本发明还公开了一种无线接入网络系统实现切换的方法, 该方法包 括以下步骤:
a. 协议栈迁移决策点建立针对 UE的无线接口协议栈实例, 并控制 源 UE接入设备删除 UE正常通信时曾为 UE建立的无线接口协议栈实 例;
目标 UE接入设备建立与 UE之间的无线连接, 并建立与协议栈迁 移决策点之间的传输链路, 源 UE接入设备建立自身到协议栈迁移决策 点之间的传输链路;
b. 源、 目标 UE接入设备分别将自身接收到的 UE无线信号发送给 所述协议栈迁移决策点; 协议栈迁移决策点对接收到的 UE无线信号进 行包括宏分集合并在内的处理。
步骤 a中, 所述协议栈迁移决策点建立所述无线接口协议栈实例的 过程为:
源 UE接入设备向协议栈迁移决策点发送针对 UE切换的无线接口 协议栈上移请求, 协议栈迁移决策点收到该无线接口协议栈上移请求 后, 建立针对 UE的无线接口协议栈实例。
步骤 a中, 所述协议栈迁移决策点控制源 UE接入设备删除所述无 线接口协议栈实例的方法为:
协议栈迁移决策点向源 UE接入设备发送无线接口协议栈上移响应, 源 UE接入设备收到该无线接口协议栈上移响应后, 删除自身曾为 UE 建立的所述无线接口协议栈实例。
步骤 a中, 源 UE接入设备发送所述无线接口协议栈上移请求之前, 该方法进一步包括:
源 UE接入设备判断接收到的 UE向其发送的导频测量消息中, 是 否包含有达到预先设定的强度门限值的 UE接入设备导频信号,如果是, 则将该导频信号对应的 UE接入设备作为目标 UE接入设备, 并向协议 栈迁移决策点发送所述无线接口协议栈上移请求。
步骤 a中, 所述目标 UE接入设备建立与 UE之间的无线连接, 并 建立与协议栈迁移决策点之间的传输链路, 以及源 UE接入设备建立自 身到协议栈迁移决策点之间的传输链路的方法包括:
al. 所述协议栈迁移决策点向源、 目标 UE接入设备发送传输链路 建立请求; 源 UE接入设备收到该传输链路建立请求后, 建立与所述协 议栈迁移决策点之间的传输链路; 目标 UE接入设备收到该传输链路建 立请求后, 为所述 UE分配无线信道, 并建立与所述协议栈迁移决策点 之间的传输链路;
a2. 目标 UE接入设备为 UE分配无线信道后, 向协议栈迁移决策 点发送传输链路建立响应; 协议栈迁移决策点收到该传输链路建立响应 后, 通过所述源 UE接入设备向 UE发送激活集更新命令; UE收到该激 活集更新命令后, 更新自身保存的激活集, 并接入目标 UE接入设备为 UE分配的所述无线信道。
步骤 b之前, 所述 UE进一步在源 UE接入设备和 /或目标 UE接入 设备的信号覆盖范围内进行更软切换 softer handover; 则步骤 b中, 所 述源、 目标 UE接入设备向所述协议栈迁移决策点发送 UE无线信号的 方法是:
源 UE接入设备和 /或目标 UE接入设备将自身接收到的 UE无线信 号进行更软合并 softer combing, 再将完成 softer combing的 UE无线信 号发送给协议栈迁移决策点。
步骤 b之前 , 所述 UE进一步在源 UE接入设备和 /或目标 UE接入 设备的信号覆盖范围内进行 softer handover; 则步骤 b中, 所述源、 目 标 UE接入设备向所述协议栈迁移决策点发送 UE无线信号的方法是: 源 UE接入设备和 /或目标 UE接入设备将自身接收到的 UE无线信 号直接发送给协议栈迁移决策点。
步骤 b中, 该方法进一步包括:
所述 UE接收其所能收到的所有 UE接入设备导频信号, 并发送给 协议栈迁移决策点; 当协议栈迁移决策点判断出来自 UE的 UE接入设 备导频信号强度降低到一定程度时, 向该导频信号所对应的 UE接入设 备发送链路释放请求; 该 UE接入设备收到该链路释放请求后, 释放为 所述 UE分配的无线资源。
所述 UE接入设备释放为所述 UE分配的无线资源后, UE只与一个 UE接入设备保持无线连接, 该方法进一步包括以下步骤:
所述协议栈迁移决策点向当前与 UE保持无线连接的 UE接入设备 发送无线接口协议栈下移请求, 该 UE接入设备收到该无线接口协议栈 下移请求后, 建立针对 UE的无线接口协议栈实例, 并向协议栈迁移决 策点返回无线接口协议栈下移响应;
协议栈迁移决策点收到无线接口协议栈下移响应后, 删除自身曾为 UE建立的无线接口协议栈实例。
所述 UE接入设备是基站,所述协议栈迁移决策点是无线网络网关; 则步骤 b中, 完成所述 UE无线信号处理后, 进一步将完成处理的 UE 无线信号发送给核心网。
与现有技术相比, 本发明所提供的无线接入网络系统中, 源 UE接 入设备用于删除为 UE建立的无线接口协议栈实例, 并将接收到的 UE 无线信号发送给协议栈迁移决策点; 目标 UE接入设备用于将接收到的 UE 无线信号发送给协议栈迁移决策点; 协议栈迁移决策点用于建立针 对 UE的无线接口协议栈实例, 并对来自源、 目标 UE接入设备的 UE 无线信号进行包括 MDC在内的处理,筒化了无线接入网中的切换流程, 降低无线传输资源的占用率, 减少无线接入网中的数据传输时延。
本发明所提供的无线接入网络系统实现切换的方法, 在 UE进行切 换时, 通过源 UE接入设备与协议栈迁移决策点的信令交互, 使源 UE 接入设备删除为 UE建立的无线接口协议栈实例, 协议栈迁移决策点建 立针对 UE的无线接口协议栈实例; 并且, 目标 UE接入设备建立与 UE 的无线连接; 源、 目标 UE接入设备将接收到的 UE无线信号发送给协 议栈迁移决策点, 由协议栈迁移决策点对收到的 UE无线信号进行包括 MDC 在内的处理, 简化了无线接入网中的切换流程, 降低无线传输资 源的占用率, 减少无线接入网中的数据传输时延。 附图简要说明
图 1为现有技术的一种无线网络中的无线接入网系统图;
图 2为现有技术用户设备切换时进行 MDC的流程图;
图 3为现有技术的一种无线接入网中进行 MDC的原理图; 图 4为现有技术的另一种无线接入网中进行 MDC的原理图; 图 5为本发明一较佳实施例的用户设备切换时进行 MDC的流程图; 图 6为本发明一较佳实施例的无线接入网中进行 MDC的原理图; 图 7为现有技术另一种无线网絡中的无线接入网系统图;
图 8为本发明另一较佳实施例的用户设备切换时进行 MDC的流程 图;
图 9为本发明的切换流程简图。 实施本发明的方式
下面结合附图及具体实施例对本发明详细说明。
本发明所提供的无线接入网络系统中, 源 UE接入设备用于删除为 UE建立的无线接口协议栈实例,并将接收到的 UE无线信号发送给协议 栈迁移决策点; 目标 UE接入设备用于将接收到的 UE无线信号发送给 协议栈迁移决策点; 协议栈迁移决策点用于建立针对 UE的无线接口协 议栈实例,并对来自源、目标 UE接入设备的 UE无线信号进行包括 MDC 在内的处理。
本发明所提供的无线接入网络系统实现切换的方法, 在 UE进行切 换时, 通过源 UE接入设备与协议栈迁移决策点的信令交互, 使源 UE 接入设备删除为 UE建立的无线接口协议栈实例, 协议栈迁移决策点建 立针对 UE的无线接口协议栈实例; 并且, 目标 UE接入设备建立与 UE 的无线连接; 源、 目标 UE接入设备将接收到的 UE无线信号发送给协 议栈迁移决策点, 由协议栈迁移决策点对收到的 UE无线信号进行包括 MDC在内的处理。
本发明无线接入网络系统中的 RNG, 除了能完成系统广播、 寻呼、 RANAP/RNSAP消息的转发等功能,还能进行无线资源的控制及管理等 操作,使得 RNG在 UE切换时仍能根据相应请求进行相关的 MDC操作。
参见图 5, 图 5为本发明一较佳实施例的用户设备切换时进行 MDC 的流程图, 该流程包括以下步骤:
步骤 501 : UE周期性接收其所能收到的所有小区的导频信号, 并向 源小区基站发送包含上述导频信号强度的导频测量消息。 当上述导频测 量消息所包含的某个小区的导频信号达到一定强度时, 源小区基站则将 所述小区作为目标小区, 并向 RNG发送 MDC上移请求。 当然, 上述目 标小区与源小区是分别被不同基站无线信号覆盖的两个小区。
上述源小区基站获知所述导频信号是否达到一定强度的方法与现有 技术的相应方法相同。
所述上移请求包含源小区基站中有关 UE切换的无线接口协议栈配 置信息, 如: 数据传输格式、 数据传输速率、 数据传输错误时是否重传 等; 上述上移请求中还包含源小区基站为 UE分配的无线信道的无线配 置等信道参数。
步驟 502: RNG收到该 MDC上移请求后, 根据请求中包含的所述 配置信息, 新建一个针对 UE的无线接口协议栈实例, 以处理 UE后续 切换过程中的无线资源控制、 管理等操作。 之后, RNG向源小区基站发 送 MDC上移响应。
RNG收到上述 MDC上移请求时, 还分别向源、 目标小区基站发送 传输链路建立请求, 请求源小区基站新建到 RNG的传输链路; 请求目 标小区基站建立 UE经目标小区基站到 RNG的传输链路。
步骤 503: 源小区基站接收到上述 MDC上移响应后,删除自身曾为 UE建立的无线接口协议栈实例,使得源小区基站不处理 UE后续切换过 程中的无线资源控制、 管理等操作。
目标小区基站接收到所述传输链路建立请求后, 建立自身与 RNG 之间的传输链路,并为 UE新分配一个无线信道,再向 RNG返回传输链 路建立响应; RNG根据该响应,通过源基站向 UE发送激活集更新命令, UE收到该命令后,接入目标小区为 UE新分配的无线信道,并对自身保 存的激活集进行更新, 即: 将目标小区为 UE分配的上述无线信道加入 上述激活集中。
源小区基站收到上述传输链路建立请求后, 新建自身与 RNG之间 的传输链路。 源小区基站新建自身与 R G之间传输链路的原因在于: 在 RNG建立针对 UE的所述无线接口协议栈实例之前, 源小区基站与 R G之间针对 UE的传输链路是基于 Iu接口的; 而当 RNG建立针对 UE的所述无线接口协议栈实例之后, 由于 R G要对来自源小区基站的 UE无线信号进行处理, 因此无法再使用基于 Iu接口的传输链路, 这使 得源小区基站需要新建自身与 RNG之间的传输链路, 并且该传输链路 通常是基于 Iub接口的。
步骤 504:完成步骤 503后,目标小区基站就与 UE建立了无线链路, 还与 RNG建立了传输链路。
之后 , 目标小区基站将接收到的 UE无线信号发送给 RNG。
同样, 源小区基站在与 UE保持无线连接的同时, 也与 RNG新建了 传输链路。
之后 , 源小区基站将接收到的 UE无线信号发送给 R G。
步骤 505: R G对接收到的发自源、 目标小区基站的 UE无线信号 进行 MDC操作。
步骤 506: RNG将完成 MDC操作的 UE无线信号发送给 CN。
CN收到上述 UE无线信号后, 对该信号进行相应处理。 如: 所述信 号是业务请求, CN则根据该信号分配相应的无线资源并进行后续的相 应操作。
如果将上述有关 MDC上移操作融入无线接入网中则如图 6所示, 图 6为本发明一较佳实施例的无线接入网中进行 MDC的原理图。其中, RNG 601与 CN 600通过 Iu接口相连, RNG 601与源 Node B 602、 目标 Node B 603通过 Iu接口相连, 源 Node B 602、 目标 Node B 603可以通 过无线链路与 UE 604通信, 源 Node B 602、 目标 Node B 603之间通过 Iur接口相连。
RNG 601除了能完成系统广播、 寻呼、 RANAP/RNSAP消息的转发 等功能外, 还能进行无线资源的控制及管理等操作; 相对而言, 源 Node B 602 目标 Node B 603除了完成无线信号扩频、 调制、 编码、 基带信 号与射频信号的转换之外, 还能完成无线资源的控制及管理等操作。
由图 6可见,当 UE 604接入目标 Node B 603后,就与源 Node B 602、 目标 Node B 603分别保持无线连接。 另外, 由于源 Node B 602已经删 除了自身曾为 UE 604建立的无线接口协议栈实例,所以,源 Node B 602 不处理 UE 604后续切换过程中的无线资源控制、 管理等操作。 而 RNG 601由于新建了针对 UE的无线接口协议栈实例, 则可以处理 UE 604后 续切换过程中的无线资源控制、 管理等操作。
这时, UE 604切换时的有关 MDC操作分为以下步骤:
步骤 a: 源 Node B 602及目标 Node B 603分别将自身接收到的 UE 604的无线信号发送给 R G 601。
步骤 b: RNG 601对接收到的发自源 Node B 602及目标 Node B 603 的 UE无线信号进行 MDC操作,并将完成 MDC操作的 UE无线信号发 送给 CN 600。
由图 6可见, 本发明的有关 UE切换时的 MDC操作只需要两步就 可以完成, 这时 UE与源、 目标小区基站均保持无线连接, 所述目标小 区基站可能是一个也可能是多个。
随着无线通信的发展, 人们正在对无线接入网进行更加深入、 合理 的演进, 其中一种正在被进行理论研究的演进方式所得的无线接入网如 图 7所示, 图 7为现有技术另一种无线网络中的无线接入网系统图。 其 中, 网际协议(IP, Internet Protocol )网络 730分别与边缘无线站(ERS, Edge Radio Station ) 740、 ERS 750、 ERS 760相连, IP网络 730还分别 与 IP接入网关(IAGW, IP Access GateWay ) 710、 IAGW 720相连; 并 且, UE 770可以接入 ERS。 所述 ERS对目前的 3G通信网络中的基站 与无线网络控制器( RNC , Radio Network Controller )进行了整合, 可 以实现基站与 RNC所能实现的通用无线通信系统无线接入网(UTRAN, UMTS Territorial Radio Access Network ) 的功能; 所述 IAGW对演进前 网络中的服务通用分組无线业务支持节点( SGSN, Serving GPRS Support Node ) 与网关通用分組无线业务支持节点 (GGSN, Gateway GPRS Support Node )进行了整合, 可以实现 SGSN与 GGSN所能实现的 CN 的功能; 并且, ERS与 IAGW之间不存在固定的归属等对应关系 , 每个 ERS可以通过 IP网络 730与不固定的任何一个或多个 IAGW建立连接 关系。
再有, 与 RNG相同的是, IAGW中也不存在针对 UE的无线接口协 议栈, 即 PDCP/BMC/RLC/MAC等无线接口协议栈; 而与 Node B相同 的是, ERS中存有针对 UE的无线接口协议栈。 这就使得 IAGW只能完 成系统广播、 寻呼、 RANAP/RNSAP消息的转发等功能, 而不能进行与 UE无线接口协议栈相关的无线资源控制及管理等操作;相对而言, ERS 除了能完成无线信号扩频、 调制、 编码、 基带信号与射频信号的转换之 外,还能完成与 UE无线接口协议栈相关的无线资源控制及管理等操作。
可见, 当 UE在图 7所示的网络结构中切换时, 需要执行与图 5相 似的流程。 如: UE 770在与 ERS 740正常通信时要向 ERS 750切换, 那么 ERS 740就作为 UE 770切换过程中的源 ERS, ERS 750则作为 UE 770切换过程中的目标 ERS。 具体的切换流程如图 8所示, 图 8所示流 程包括以下步骤:
步骤 801 : 源 ERS接收 UE的测量报告, 根据该报告向 IAGW发送 无线接口协议栈上下文上移请求。
步骤 802: IAGW根据来自源 ERS的无线接口协议栈上下文上移请 求建立针对 UE的无线接口协议栈实例, 并向源 ERS发送无线接口协议 栈上下文上移响应; 同时向目标 ERS发送切换请求。
步骤 803: 源 ERS根据收到的无线接口协议栈上下文上移响应删除 自身为 UE建立的无线接口协议栈实例, 并新建自身到 IAGW之间的传 输链路; 目标 ERS建立自身到 IAGW的传输链路以及自身与 UE之间的 无线链路。 源 ERS新建自身到 IAGW之间传输链路的原因, 与步骤 503 中的相应原因相同。
步驟 804: 源、 目标 ERS分别将自身接收的 UE无线信号发送给 IAGWo
步骤 805: IAGW对接收到的发自源、 目标 ERS的 UE无线信号进 行包括 MDC在内的后续处理。 所述后续处理中, 完成 MDC后可继续 进行的处理还有很多种, 如: IAGW接收到的 UE无线信号是会话建立 请求, IAGW则根据该请求中包含的参数以及自身的可分配带宽等工作 状态, 应用现有技术确定是否支持 UE的会话。
可见, 图 8中的步骤 801至步骤 805分别与图 5中的步骤 501至步 骤 505基本相同, 区别在于操作实体由图 5中的 R G、 CN变成了图 8 中的 ERS、 IAGW。 再有, 图 8中的无线接口协议栈上下文上移请求、 无线接口协议栈上下文上移响应所起的作用分别与图 5中的 MDC上移 请求、 MDC 上移响应所起的作用相同。 其中, 无线接口协议栈上下文 上移请求与 MDC上移请求都是为了完成针对 UE的无线接口协议栈的 上移; 无线接口协议栈上下文上移响应与 MDC上移响应则都是为了继 续后续的切换过程。
由上述的图 5、 图 8可见, 可以将基站与 ERS统称为 UE接入设备; 将 RNG与 IAGW统称为协议栈迁移决策点; 将 MDC上移请求与无线 接口协议栈上下文上移请求统称为无线接口协议栈上移请求; 将 MDC 上移响应与无线接口协议栈上下文上移响应统称为无线接口协议栈上 移响应。
UE与源、 目标 UE接入设备均保持无线连接时, 仍会周期性地接收 其所能收到的所有 UE接入设备的导频信号, 并通过源 UE接入设备向 协议栈迁移决策点发送包含上述导频信号的导频测量消息。 当协议栈迁 移决策点判断出来自 UE的导频测量消息所包含的某个 UE接入设备的 导频信号强度降低到一定程度时, 就向该 UE接入设备发送链路释放请 求; 该 UE接入设备收到该链路释放请求后, 就释放为 UE分配的无线 资源。 与此同时, 协议栈迁移决策点向 UE发送激活集更新消息, UE 收到该消息后, 对自身的激活集进行相应更新: 删除激活集中已不再与 UE保持无线连接的 UE接入设备的标识。
经过一次或多次上述的无线资源释放操作后, UE最终可能只与一个 其能接收到最强导频信号的 UE接入设备保持无线连接, 而此时 UE的 激活集中也只保存有一个 UE接入设备的无线信道, 即: 激活集中只存 在一个 UE接入设备的无线链路。
当协议栈迁移决策点发现 UE的激活集中只存在一个 ΌΈ接入设备 的无线链路时, 向该 UE接入设备发送无线接口协议栈下移请求, 该无 线接口协议栈下移请求中包含协议栈迁移决策点针对 UE建立的无线接 口协议栈实例所包含的配置信息, 如: 数据传输格式、 数据传输速率、 数据传输错误时是否重传等配置参数信息。
所述 UE接入设备收到上述无线接口协议栈下移请求后, 根据该请 求中包含的配置信息等参数建立针对 UE的无线接口协议栈实例, 以保 证能对 UE后续的通信操作进行正常处理。 同时, 该 UE接入设备向协 议栈迁移决策点发送无线接口协议栈下移响应。 协议栈迁移决策点收到 该无线接口协议栈下移响应后, 删除自身曾为 UE建立的无线接口协议 栈实例。
以上所述的切换过程中, UE只与源 UE接入设备通过一条无线链路 保持连接。然而, UE在源 UE接入设备的信号覆盖范围内进行跨扇区的 更软切换( softer handover )时, 则通过多条无线链路与源 UE接入设备 保持连接。 这时的切换方法相比较图 5所示的切换方法而言, 就会有一 些不同。 所述不同在于: 当源 UE接入设备与协议栈迁移决策点建立了 传输链路; 并且目标 UE接入设备与 UE建立了无线链路, 还与协议栈 迁移决策点建立了传输链路之后, 源 UE接入设备先通过与 UE相连的 多条无线链路接收发自 UE的无线信号, 再对这些无线信号进行更软合 并 ( softer combing )。
之后, 源 UE接入设备将龙成 softer combing的 UE无线信号发送给 协议栈迁移决策点; 并且, 目标 UE接入设备将接收到的 UE无线信号 发送给协议栈迁移决策点; 协议栈迁移决策点再对接收到的上述源 UE 接入设备完成 softer combing的 UE无线信号以及发自目标 UE接入设备 的 UE无线信号进行 MDC操作等处理。
当然,如果 UE在切换到目标 UE接入设备后, 又在目标 UE接入设 备的信号覆盖范围内进行跨扇区的 softer handover,使得目标 UE接入设 备通过多条无线链路与 UE保持无线连接。 那么, 当源 UE接入设备与 协议栈迁移决策点建立了传输链路; 并且目标 UE接入设备与 UE建立 了无线链路, 还与协议栈迁移决策点建立了传输链路之后, 目标 UE接 入设备也要先通过与 UE相连的多条无线链路接收发自 UE的无线信号, 再将这些无线信号进行 softer combing。
之后, 源 UE接入设备将完成 softer combing的 UE无线信号发送给 协议栈迁移决策点; 并且, 目标 UE接入设备将完成 softer combing的 UE 无线信号发送给协议栈迁移决策点; 协议栈迁移决策点再对接收到 的上述源、 目标 UE接入设备完成 softer combing的 UE无线信号进行 MDC操作等处理。
由以上所述可见,当 UE在切换时具有上述 softer handover的情况下, 源和 /或目标 UE接入设备可以先将各自接收到的 UE无线信号进行 softer combing, 再将完成 softer combing的 UE无线信号发送给协议栈迁移决 策点, 由协议栈迁移决策点进行后续的 MDC操作等处理, 其间具体的 信令流程与图 5所迷的信令流程原理相同, 在此不再赘述。
实际上, 源和 /或目标 UE接入设备也可以不对接收到的多条无线链 路的 UE无线信号进行 softer combing, 而是分别将该 UE无线信号发送 给协议栈迁移决策点, 由协议栈迁移决策点直接对其接收到的所有 UE 无线信号进行 MDC操作等后续信号处理, 其间具体的信令流程与图 5 所述的信令流程原理相同, 在此不再赘述。
结合上述的图 5、 图 8, 可以用图 9筒要描述 UE的切换流程, 图 9 所示流程包括以下步骤:
步骤 901 :源 UE接入设备向协议栈迁移决策点发送与 UE相对应的 无线接口协议栈上移请求。
步骤 902: 协议栈迁移决策点收到无线接口协议栈上移请求后 , 建 立针对 UE的无线接口协议栈实例 , 并向源 UE接入设备发送无线接口 协议栈上移响应。
步骤 903: 源 UE接入设备收到无线接口协议栈上移响应后,删除自 身曾为 UE建立的无线接口协议栈实例; 目标 UE接入设备建立与 UE 之间的无线连接, 还建立与协议栈迁移决策点之间的传输链路, 源 UE 接入^备建立自身到协议栈迁移决策点之间的传输链路。
步骤 904: 源、 目标 UE接入设备分别将自身接收到的 UE无线信号 发送给协议栈迁移决策点 , 由协议栈迁移决策点处理接收到的 UE无线 信号。 所述处理方法为进行 MDC操作等。
由以 所述可以看出, 本发明所提供的无线接入网络系统及其实现 切换的方法, 简化了无线接入网中的切换流程, 降低无线传输资源的占 用率, 减少无线接入网中的数据传输时延。 以上所述仅为本发明的过程 及方法实施例, 并不用以限制本发明, 凡在本发明的精神和原则之内所 做的任何修改、等同替换、 改进等, 均应包含在本发明的保护范围之内

Claims

权利要求书
1、 一种无线接入网络系统, 其特征在于, 该系统包括:
源用户终端 UE接入设备, 用于在与自身保持无线连接的 UE进行 切换时向协议栈迁移决策点发送无线接口协议栈上移请求, 当接收到发 自协议栈迁移决策点的无线接口协议栈上移响应后, 删除自身曾为 UE 建立的无线接口协议栈实例, 将接收到的 UE无线信号发送给协议栈迁 移决策点;
目标 UE接入设备, 用于同 UE建立无线连接, 并将接收到的 UE 无线信号发送给协议栈迁移决策点;
协议栈迁移决策点, 与源 UE接入设备和目标 UE接入设备相连, 用于在收到无线接口协议栈上移请求后, 建立针对 UE的无线接口协议 栈实例, 并对来自上述源、 目标 UE接入设备的所述 ΌΈ无线信号进行 包括宏分集合并在内的处理。
2、 如权利要求 1所述的系统, 其特征在于, 所述源、 目标 UE接入 设备是边缘无线站 ERS, 所述协议栈迁移决策点是网际协议接入网关 IAGW, IAGW通过网际协议 IP网络与 ERS相连。
3、 如权利要求 1所述的系统, 其特征在于, 所述源、 目标 UE接入 设备是基站, 所述协议栈迁移决策点是无线网络网关。
4、 一种无线接入网络系统实现切换的方法, 其特征在于, 该方法 包括以下步骤:
a. 协议栈迁移决策点建立针对 UE的无线接口协议栈实例, 并控制 源 UE接入设备删除 UE正常通信时曾为 UE建立的无线接口协议栈实 例;
目标 UE接入设备建立与 UE之间的无线连接, 并建立与协议栈迁 移决策点之间的传输链路, 源 UE接入设备建立自身到协议栈迁移决策 点之间的传输链路;
b. 源、 目标 UE接入设备分别将自身接收到的 UE无线信号发送给 所述协议栈迁移决策点; 协议栈迁移决策点对接收到的 UE无线信号进 行包括宏分集合并在内的处理。
5、 如权利要求 4所述的方法, 其特征在于, 步骤 a中, 所述协议栈 迁移决策点建立所述无线接口协议栈实例的过程为:
源 UE接入设备向协议栈迁移决策点发送针对 UE切换的无线接口 协议栈上移请求, 协议栈迁移决策点收到该无线接口协议栈上移请求 后, 建立针对 UE的无线接口协议栈实例。
6、 如权利要求 4所述的方法, 其特征在于, 步驟 a中, 所述协议栈 迁移决策点控制源 UE接入设备删除所述无线接口协议栈实例的方法 为:
协议栈迁移决策点向源 UE接入设备发送无线接口协议栈上移响 应, 源 UE接入设备收到该无线接口协议栈上移响应后, 删除自身曽为 UE建立的所述无线接口协议栈实例。
7、 如权利要求 4所述的方法, 其特征在于, 步骤 a中, 源 UE接入 设备发送所述无线接口协议栈上移请求之前, 该方法进一步包括:
源 UE接入设备判断接收到的 UE向其发送的导频测量消息中, 是 否包含有达到预先设定的强度门限值的 UE接入设备导频信号,如果是, 则将该导频信号对应的 UE接入设备作为目标 UE接入设备, 并向协议 栈迁移决策点发送所述无线接口协议栈上移请求。
8、 如权利要求 4所述的方法, 其特征在于, 步驟 a中, 所述目标 UE接入设备建立与 UE之间的无线连接,并建立与协议栈迁移决策点之 间的传输链路, 以及源 UE接入设备建立自身到协议栈迁移决策点之间 的传输链路的方法包括: al. 所述协议栈迁移决策点向源、 目标 UE接入设备发送传输链路 建立请求; 源 UE接入设备收到该传输链路建立请求后, 建立与所述协 议栈迁移决策点之间的传输链路; 目标 UE接入设备收到该传输链路建 立请求后, 为所述 UE分配无线信道, 并建立与所述协议栈迁移决策点 之间的传输链路;
a2. 目标 UE接入设备为 UE分配无线信道后, 向协议栈迁移决策 点发送传输链路建立响应; 协议栈迁移决策点收到该传输链路建立响应 后, 通过所述源 UE接入设备向 UE发送激活集更新命令; UE收到该激 活集更新命令后, 更新自身保存的激活集, 并接入目标 UE接入设备为 UE分配的所述无线信道。
9、 如权利要求 4所述的方法, 其特征在于, 步骤 b之前, 所述 UE 进一步在源 UE接入设备和 /或目标 UE接入设备的信号覆盖范围内进行 更软切换 softer handover; 则步骤 b中, 所述源、 目标 UE接入设备向所 述协议栈迁移决策点发送 UE无线信号的方法是:
源 UE接入设备和 /或目标 UE接入设备将自身接收到的 UE无线信 号进行更软合并 softer combing, 再将完成 softer combing的 UE无线信 号发送给协议栈迁移决策点。
10、 如权利要求 4 所述的方法, 其特征在于, 步骤 b之前, 所述 UE进一步在源 UE接入设备和 /或目标 UE接入设备的信号覆盖范围内 进行 softer handover; 则步骤 b中, 所述源、 目标 UE接入设备向所述协 议栈迁移决策点发送 UE无线信号的方法是:
源 UE接入设备和 /或目标 UE接入设备将自身接收到的 UE无线信 号直接发送给协议栈迁移决策点。
11、 如权利要求 4至 10任一项所述的方法, 其特征在于, 步骤 b 中, 该方法进一步包括: 所述 UE接收其所能收到的所有 UE接入设备导频信号, 并发送给 协议栈迁移决策点; 当协议栈迁移决策点判断出来自 UE的 UE接入设 备导频信号强度降低到一定程度时, 向该导频信号所对应的 UE接入设 备发送链路释放请求; 该 UE接入设备收到该链路释放请求后 , 释放为 所述 UE分配的无线资源。
12、 如权利要求 11所述的方法, 其特征在于, 所述 UE接入设备译 放为所述 UE分配的无线资源后, UE只与一个 UE接入设备保持无线连 接, 该方法进一步包括以下步骤:
所述协议栈迁移决策点向当前与 UE保持无线连接的 UE接入设备 发送无线接口协议栈下移请求, 该 UE接入设备收到该无线接口协议栈 下移请求后, 建立针对 UE的无线接口协议栈实例, 并向协议栈迁移决 策点返回无线接口协议栈下移响应;
协议栈迁移决策点收到无线接口协议栈下移响应后, 删除自身曾为 UE建立的无线接口协议栈实例。
13、 如权利要求 4至 10任一项所述的方法, 其特征在于, 所述 UE 接入设备是基站,所述协议栈迁移决策点是无线网络网关;则步據 b中, 完成所述 UE无线信号处理后, 进一步将完成处理的 UE无线信号发送 给核心网。
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