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WO2006106561A1 - Procede de commande de transfert, appareil de commande de station de base et station mobile - Google Patents

Procede de commande de transfert, appareil de commande de station de base et station mobile Download PDF

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Publication number
WO2006106561A1
WO2006106561A1 PCT/JP2005/005821 JP2005005821W WO2006106561A1 WO 2006106561 A1 WO2006106561 A1 WO 2006106561A1 JP 2005005821 W JP2005005821 W JP 2005005821W WO 2006106561 A1 WO2006106561 A1 WO 2006106561A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
active set
dch
mobile station
communication
Prior art date
Application number
PCT/JP2005/005821
Other languages
English (en)
Japanese (ja)
Inventor
Koutarou Sugisawa
Hideji Wakabayashi
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2005/005821 priority Critical patent/WO2006106561A1/fr
Priority to KR1020077009824A priority patent/KR100864893B1/ko
Priority to KR1020087018824A priority patent/KR100921511B1/ko
Priority to EP10172839.2A priority patent/EP2252108A3/fr
Priority to US11/666,301 priority patent/US8050222B2/en
Priority to PCT/JP2006/301353 priority patent/WO2006103823A1/fr
Priority to EP10172838A priority patent/EP2254372A1/fr
Priority to EP10172835.0A priority patent/EP2252106B1/fr
Priority to JP2007510326A priority patent/JPWO2006103823A1/ja
Priority to KR1020097004696A priority patent/KR101103213B1/ko
Priority to EP10172834.3A priority patent/EP2252105B1/fr
Priority to KR1020077010102A priority patent/KR20070053823A/ko
Priority to AU2006229008A priority patent/AU2006229008C1/en
Priority to CN200680001161.6A priority patent/CN101053276B/zh
Priority to EP06712519A priority patent/EP1802161B1/fr
Publication of WO2006106561A1 publication Critical patent/WO2006106561A1/fr
Priority to JP2007021518A priority patent/JP2007151167A/ja
Priority to JP2007272869A priority patent/JP4840326B2/ja
Priority to HK08101904.5A priority patent/HK1111550A1/xx
Priority to AU2009201166A priority patent/AU2009201166B2/en
Priority to JP2010254645A priority patent/JP2011035943A/ja
Priority to JP2011141817A priority patent/JP2011188534A/ja
Priority to US13/172,309 priority patent/US8355375B2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • the present invention provides W_CDMA (Wideband-Code Division Multiple
  • the present invention relates to a handover control method in a communication system using Access (broadband code division multiple access).
  • FIG. 15 is an explanatory diagram for explaining the configuration of a mobile communication system using the W-CDMA scheme.
  • a mobile station 1500 (UE: User Equipment) is a device used by a user, such as a mobile phone or a mobile information terminal.
  • Mobile station 1500 communicates with base station 150 1 (Node B) using radio.
  • Base station 1501 transmits / receives user data and control signals to / from mobile station 1500 located within a predetermined area (cell), and controls transmission power and transmission timing of mobile station 1500.
  • An “uplink” radio link that transmits data from mobile station 1500 to base station 1501 is an “uplink”, and a “downlink” radio link that transmits data from base station 1501 to mobile station 1500. This is called “downlink”.
  • a base station controller 1502 relays data between the base station 1501 and the core network, and also performs line connection control, handover control, and the like of the radio line.
  • the base station 1501 and the base station controller 1502 constitute a radio access network (RAN), and in a communication system defined by the 3GPP (3rd Generation Partnership Project) standard, the RAN is a UTRAN (Universal Terrestrial RAN).
  • FIG. 16 is an explanatory diagram illustrating channels for performing wireless communication between mobile station 1500 and base station 1501.
  • DCH1600 Dedicated CHannel
  • DCH1600 is a channel for transmitting data, and is set in both the upstream and downstream directions.
  • DCH1600 is a channel specified in 3GPP standard R9 9 (Release 1999).
  • HS—DSCH 1601 High Speed Downlink Shared CHannel
  • HSDPA High Speed Downlink Packet Access
  • HS—DSCH1601 is defined in 3GPP standard Rel5 (Release 5).
  • E-DCH1 602 (Enhanced Dedicated CHannel) is a channel set in the uplink direction for large-capacity data transmission.
  • E—DCH1602 is defined in Rel6 (Release 6) of the 3GPP standard.
  • the current mobile communication system is operated in accordance with the specifications specified in R99 of the 3GPP standard, and the specifications specified in Re and Rel6 are expected to be introduced in the future.
  • a mobile station simultaneously performs communication by connecting multiple cells and radio links to perform communication, thereby combining signals from multiple base stations and improving the reception quality around the cell. Improved, uninterrupted communication can be realized.
  • Multiple base stations that communicate with a mobile station at the same time are called members of the mobile station's “active set”.
  • an active set is information about a plurality of base stations with which a certain mobile station is communicating.
  • the mobile station can synthesize signals received from multiple base stations and improve communication quality.
  • the base station control device can improve communication quality by combining signals transmitted via a plurality of base stations.
  • the base station controller Since the base station controller synthesizes received data transmitted via a plurality of base stations, it can determine whether a transmission signal from a certain mobile station is properly transmitted. Therefore, retransmission control for determining whether to retransmit data to the mobile station is performed by the base station controller. When retransmission is necessary, the base station controller notifies the mobile station of a retransmission instruction signal with the same SN (Sequence Number) via a plurality of base stations.
  • SN Sequence Number
  • Patent Document 1 Japanese Translation of Special Publication 2003-525533
  • Non-Patent Document 1 discloses handover between base stations of different versions. According to Non-Patent Document 1, if the mobile station power EUL transmitted using EUL (Enhanced Up Link) to a Rel6-compatible base station cannot be used, and moves to a cell of a Re-compatible base station, E — It is disclosed that DCH transmission is stopped and switched to DCH.
  • EUL Enhanced Up Link
  • Non-Patent Document 1 R1— 040962 "Proposal on RR / SI time multiplexing with
  • the mobile station has to transmit a large amount of data using DCH instead of E-DCH, so the amount of interference in the cell increases and throughput decreases. This causes a problem on the system side.
  • the use of E-DCH which allows high-speed transmission, must be stopped and the DCH must be used, which causes a problem that it takes time to send the same amount of data.
  • the system and mobile station when transmitting large amounts of data, it is preferable for the system and mobile station to use E-DCH instead of DCH. Therefore, base stations that can use E-DCH and base stations that cannot use E-DCH It is preferable to remove the base stations compatible with Rel5 and R99 from the active set.
  • the format determined by Rel6 for example, slot format
  • the power determined by Re or R99 and as a result of the change, the Re or R99 compatible base station is transmitted from the mobile station compatible with Rel6.
  • a problem that the slot format cannot be recognized may also occur.
  • the slot format of uplink DPCCH Dedicated Physical Control Channel
  • TPC Transmission Power Command
  • TFCI Transport Format Combination Indicator
  • the uplink DPCCH slot format is 4 bits for the no-bit bit, 3 bits for the new control bit newly established in Rel6, 1 bit for the TPC bit, and 2 bits for the TFCI bit.
  • One slot consists of 10 bits.
  • the R99-compatible base station misrecognizes the slot format transmitted from the Rel6-compatible mobile station as the R99 pilot bit, the first 2 bits of the 4-bit pilot bit and the new restriction control bit, The last 1 bit of the new control bit and the TPC2 bit may be mistakenly identified as the R99 TPC bit.
  • a predetermined mobile station transmits a dedicated physical channel.
  • a base station selection process that selects a predetermined base station from an active set that records information related to the base station that is communicating, and a high-speed packet data channel that can transmit a large amount of high-speed packet data in the upstream direction
  • a channel setting determination process for determining whether the first base station can be set or a second base station that cannot set a high-speed packet data channel, and in this channel setting determination process, the communication with the second base station is stopped.
  • the active set determination process for deleting the second base station from the active set and the active set Based on Tsu preparative determining active set determined by the processing, it is intended to include the channel setting process that instructs to release the dedicated physical switch Yaneru the mobile station and the second base station.
  • the base station control device has a base station power selected from an active set in which a base station communicating with a predetermined mobile station via a dedicated physical channel is recorded. Determine whether it is the first base station that can set up a high-speed packet data channel that can transmit data, or a second base station that cannot set up a high-speed packet data channel, and stop communication with the second base station. If communication with the first base station can be maintained and the communication quality evaluation process is performed, and communication with the first base station can be maintained, the second base station is deleted from the active set. The base station and the base station and the active set controller to release the dedicated physical channel with the second base station based on the active set updated by the active set controller. And a radio resource management unit that instructs the mobile station.
  • the mobile station according to the present invention communicates with a predetermined mobile station via a dedicated physical channel, and the base station selected from the active set in which the base station is recorded has a large capacity and high speed in the uplink direction. Determined whether the first base station that can set up a high-speed packet data channel that can transmit packet data or the second base station that cannot set up a high-speed packet data channel, and stopped communication with the second base station If communication with the dedicated physical channel with the first base station can be maintained in the state, communication quality evaluation processing is performed, and if communication with the first base station can be maintained, the second base station is set to the active set.
  • An active set controller to be removed from, Based on the active set updated by the active set control unit, a transmission unit that transmits a notification signal to the base station control device to release the dedicated physical channel with the second base station, and an instruction from the base station control device On the basis of this, a protocol processor for releasing a dedicated physical channel with the second base station is provided.
  • a handover control method includes a base station that selects a predetermined base station from an active set in which information on a base station with which a predetermined mobile station is communicating via a dedicated physical channel is recorded. Selection processing and channel setting determination processing to determine whether the first base station can set a high-speed packet data channel capable of transmitting a large amount of high-speed packet data in the upstream direction or the second base station that cannot set a high-speed packet data channel In this channel setting determination process, whether communication with the dedicated physical channel with the first base station can be maintained while communication with the second base station is stopped, or between the first base station and the mobile station.
  • the communication quality evaluation process for evaluating the communication quality and the communication quality between the first base station and the mobile station are good while communication with the second base station is stopped, Based on the active set determination process for deleting the second base station from the set and the active set determined by the active set determination process, the individual physical channel between the second base station and the mobile station is released.
  • soft handover with base stations that cannot use E-DCH is restricted, and E-DCH is used preferentially. it can.
  • the base station control apparatus has a base station power selected from an active set in which a base station communicating with a predetermined mobile station via a dedicated physical channel is recorded. Determine whether it is the first base station that can set up a high-speed packet data channel that can transmit data, or a second base station that cannot set up a high-speed packet data channel, and stop communication with the second base station. If communication with the first base station can be maintained and the communication quality evaluation process is performed, and communication with the first base station can be maintained, the second base station is deleted from the active set. The base station and the base station and the active set controller to release the dedicated physical channel with the second base station based on the active set updated by the active set controller. Radio that instructs mobile stations Since a resource management unit is provided, in a mobile communication system where base stations of different versions coexist, soft handover with base stations that cannot use E-DCH is restricted, and E-DCH can be used preferentially. .
  • the mobile station according to the present invention communicates with a predetermined mobile station via a dedicated physical channel, and the base station selected from the active set in which the base station is recorded has a large capacity and high speed in the uplink direction. Determined whether the first base station that can set up a high-speed packet data channel that can transmit packet data or the second base station that cannot set up a high-speed packet data channel, and stopped communication with the second base station If communication with the dedicated physical channel with the first base station can be maintained in the state, communication quality evaluation processing is performed, and if communication with the first base station can be maintained, the second base station is set to the active set.
  • E-DCH can be preferentially used by limiting soft handover with base stations that cannot use E-DCH.
  • FIG. 1 is a block diagram of a base station control device constituting a communication system according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a base station corresponding to Rel6.
  • FIG. 3 is a flowchart illustrating soft handover control processing in the communication system according to Embodiment 1 of the present invention.
  • FIG. 4 is a conceptual diagram showing a process for setting E-DCH during soft handover between base stations of different versions.
  • FIG. 5 is a flowchart showing details of active set determination processing.
  • FIG. 6 is a flowchart illustrating details of an active set update process.
  • FIG. 7 is a flowchart showing details of a communication quality evaluation process.
  • FIG. 8 is a flowchart showing details of communication quality evaluation processing.
  • FIG. 9 is a block diagram of a mobile station that constitutes a communication system according to Embodiment 2 of the present invention.
  • FIG. 10 is a flowchart illustrating soft handover control processing in the communication system according to Embodiment 2 of the present invention.
  • FIG. 11 is an explanatory diagram for explaining base station version information notified from a base station control device to a mobile station.
  • FIG. 12 is a flowchart for explaining active set determination processing executed by a mobile station.
  • FIG. 13 is a flowchart explaining a soft handover one control process in the mobile communication system according to the third embodiment of the present invention.
  • FIG. 14 is a flowchart explaining a soft handover one control process in the mobile communication system according to the fourth embodiment of the present invention.
  • FIG. 15 is an explanatory diagram for explaining a configuration of a mobile communication system using a W-CDMA system.
  • FIG. 16 is an explanatory diagram for explaining a channel for performing wireless communication between a mobile station and a base station.
  • control unit 201 protocol processing unit, 202 DPCH transmission unit,
  • control unit 901 protocol processing unit, 902 DPCH addition / deletion unit, 903 DPCH transmission section, 904 E— DCH addition Z deletion section,
  • Base station version information determination unit 918 Base station version information determination unit, 919 DPCH reception unit, 920 detection unit
  • FIG. 1 is a block diagram showing a configuration of a base station control apparatus constituting the communication system according to Embodiment 1 of the present invention.
  • the control unit 100 controls hardware and functions of each base station.
  • the transmission control unit 101 is a unit that takes charge of retransmission control and guarantees link reliability.
  • the radio resource management unit 102 manages radio resources such as power, code, and frequency band related to CDMA.
  • the active set quality information management unit 103 stores the quality information of the radio link of each active set.
  • the base station version information management unit 104 stores version information of the base stations being served thereby.
  • the active set information management unit 105 stores the current active set state.
  • the event receiving unit 106 receives a notification (event event) for requesting addition or deletion of a certain base station from the active set.
  • the active set control unit 107 controls addition or deletion of the base station to the active set.
  • Base station version information determination section 108 determines the version of the base station based on the base station version information stored in base station version information management section 104.
  • a base station version information management unit 104 and a base station version information determination unit 108 are newly provided, and the other parts are existing parts.
  • FIG. 2 is a block diagram showing a configuration of a base station corresponding to Rel6.
  • the control unit 200 sets the channel.
  • the protocol processing unit 201 performs protocol processing such as channel setting and release.
  • DPCH transmission section 202 is a dedicated physical channel (DPCH: Dedicated Performs processing to transmit (Physical Channel).
  • a common pilot channel (CPICH: Common Pilot Channel) transmission unit 203 transmits a common pilot signal.
  • Modulation section 204 modulates the signals output from DPCH transmission section 202 and CPICH transmission section 203.
  • the power amplification unit 205 amplifies the output signal from the modulation unit 204 to a predetermined transmission power.
  • the signal amplified to the transmission power by the power amplification unit 205 is transmitted from the antenna 206.
  • the low noise amplifying unit 207 amplifies the reception signal received by the antenna 206.
  • Demodulation section 208 demodulates the received signal amplified by low noise amplification section 207 and separates and outputs each channel such as DPCH, E_DCH, E-DPC CH (Enhanced-Dedicated Physical Control CHannel).
  • the DPCH receiving unit 209 processes the DPCH signal output from the demodulating unit 208 and obtains data transmitted on the DPCH.
  • the E-DCH receiving unit 210 processes the E-DCH signal output from the demodulating unit 208, and obtains large-capacity high-speed packet data transmitted by the E-DCH.
  • the E-DPCCH reception unit 211 processes the E-DPCCH signal output from the demodulation unit 208.
  • Uplink quality measuring section 212 measures uplink DPCCH communication quality.
  • the scheduling information processing unit 213 processes scheduling information.
  • the scheduling information storage unit 214 manages scheduling information. Scheduling information is information necessary for the base station to perform scheduling processing for allocating radio resources to terminals, and includes the transmission power margin of the mobile station and the amount of data transmitted by the mobile station.
  • FIG. 3 is a flowchart for explaining soft handover control processing in the communication system according to Embodiment 1 of the present invention.
  • Fig. 4 is a conceptual diagram showing the process of setting E-DCH during soft handover between base stations of different versions.
  • Fig. 4 (a) shows a soft handover state in which mobile station 400 communicates with Rel6-compatible base station 401 via DCH 403, and with R 99-compatible base station 402 via DCH 404. It is shown that.
  • FIG. 4 (b) shows a state in which the DCH 404 with the base station 402 is disconnected when the mobile station 400 starts large-capacity data communication with the base station 401 using the E-DCH 405.
  • FIG. The mobile station 400 shown in FIG. 4 is assumed to support Rel6.
  • Base station controller core network
  • the active set of the mobile station eg mobile station 400 in FIG. 4
  • base stations that do not support E-DCH base stations 402 corresponding to specifications other than Rel6
  • An active set determination process for determining whether to remove the set is performed (step ST301).
  • This active set determination processing includes processing for evaluating communication quality when DCH is disconnected from a base station that does not support E-DCH.
  • the base station removed from the active set is deleted from the active set and recorded in, for example, the active set deletion list.
  • Base stations recorded in the active set deletion list cannot use E-DCH, and even if DCH is disconnected, the mobile station does not cause communication quality degradation.
  • the base station controller releases the DCH with mobile station 400 to the base stations (for example, R99 compatible base station 402) registered in the active set deletion list. This is indicated using the NBAP (Node BA lication Part) protocol.
  • the mobile station 400 is instructed to release the DCH with the base station 402 using the RRC (Radio Resource Control) protocol (step ST302).
  • RRC Radio Resource Control
  • mobile station 400 and base station 402 each release DCH (steps ST303 and ST304).
  • the base station controller sets the E-DCH with the mobile station 400 for the base station recorded in the active set (for example, the Rel6-compatible base station 401 that can use the E-DCH).
  • the mobile station 400 is instructed to set up E-DCH with the base station 401 using the RRC protocol (step ST305).
  • processing for setting E-DCH between the mobile station 400 and the base station 402 is executed (steps ST306 and 307).
  • FIG. 5 is a flowchart explaining the active set determination processing executed by the base station control device.
  • FIG. 5 is a flowchart showing details of the active set determination process in step ST301 shown in FIG.
  • the base station controller is transferred from the core network.
  • active set information management section 105 refers to the active set of the mobile station that sets E-DCH (step ST500).
  • step ST501 a plurality of base stations with which mobile stations communicate via DPCH are recorded.
  • Active set control section 107 selects one of a plurality of base stations recorded in the active set (step ST501), and performs a process of determining whether the selected base station can use E-DCH (step ST502). ).
  • Whether or not the selected base station can use E-DCH is determined by the base station version information management unit 104 and the base station version information determination unit 108 based on the base station version information. For example, if the selected base station supports Rel6, E-DCH can be used. In this case, step ST503 is executed, and it is determined whether there are any unchecked base stations. On the other hand, if the selected base station supports Re or R99, E-DCH cannot be used. In this case, the process of step ST504 is executed.
  • Step ST504 is performed to determine whether the quality of the radio link with the corresponding base station can be maintained.
  • step ST504 If the E—DCH incompatible base station is deleted from the active set and the DCH communication quality cannot be maintained (No in step ST504), the E—DCH incompatible base station is not deleted from the active set. E—Maintain DCH with base station not supporting DCH (step ST505). On the other hand, if the communication quality of DCH can be maintained even if the E—DCH incompatible base station is removed from the active set (Yes in step ST504), the E—DCH incompatible base station is deleted from the active set (step ST506). ). After step ST505 or step ST506 is executed, have all the base stations stored in the active set been checked?
  • step ST503 If it is determined (step ST503) and an unchecked base station remains (NO in step ST503), the processing after step ST501 is repeated. If there are no unchecked base stations remaining (Yes in step ST503), the mobile station determines whether E-DCH is unavailable (step ST507). When the mobile station cannot use E-DCH, it means that all base stations recorded in the active set do not support E-DCH, or if a base station that does not support E-DCH is removed from the active set. There are reasons such as inability to maintain DCH communication quality.
  • step ST507 Since the E—DCH bearer setting is instructed by the core network capability, if the E—DCH ⁇ IJ is not possible (Yes in step ST507), the core network is notified that the E—DCH cannot be set. If E-DCH can be used (No in step ST507), the processing after step ST302 in FIG. 3 is executed.
  • FIG. 6 is a flowchart for explaining the details of the active set update process.
  • event receiving section 106 receives an event transmitted from a mobile station (step ST600).
  • Active set control section 107 determines whether the event transmitted from the mobile station is a request (event 1A) to add a certain base station to the active set (step ST601). If it is event 1A (Yes in step ST601), active set control section 107 adds the base station specified in event 1A to the active set (step ST602).
  • the active set control unit 107 requests that the base station be deleted from the active set. (Event 1B) is determined (step ST603). If it is event 1B (Yes in step ST603), active set control section 107 deletes the base station specified in event 1B from the active set (step ST604).
  • the active set control unit 107 determines that the base station in the active set is a predetermined base station. It is determined whether it is a request to request replacement (event 1C) (step ST605). If it is event 1C (Yes in step ST605), In step ST606, the active set control unit 107 performs processing for confirming the communication quality of the base station specified in event 1C.
  • the base station controller determines whether the communication quality of the base station specified in event 1C is better than a predetermined base station with a lower communication quality among the base stations registered in the active set. To do. If the base station specified in event 1C has better communication quality than the base station recorded in the active set (Yes in step ST606), the base station specified in event 1C is added to the active set, and event 1C A replacement process is performed to delete from the active set any base station whose communication quality is lower than that of the base station specified in (ST ST07 07). Then, the base station controller updates the active set based on the processing result of the above step (step ST608).
  • the base station controller ends the process without performing the active set update process. If the communication quality of the base station specified in event 1C is worse than the communication quality of any base station registered in the active set (No in step ST606), communication with the base station specified in event 1C is possible. Since there is no need to replace the base station in the active set with good quality, the base station controller ends the process without updating the active set.
  • step ST504 of FIG. 5 a communication quality evaluation process is performed to determine whether or not the DCH communication quality can be maintained with the base set not supporting E-DCH removed from the active set.
  • FIG. 7 is a flowchart showing a first method of the communication quality evaluation process executed in step ST504 of FIG. The first method of this communication quality evaluation process is performed by the mobile station and notifies the base station controller of the result. In Fig. 7, the mobile station calculates the remaining available transmission power value (transmission power margin) by subtracting the maximum transmission power value allocated by the base station from the transmission power value used for the current transmission. (Step ST700). Then, by using the usable power value obtained in step ST700, it is determined whether the condition for maintaining the quality of the radio link is satisfied (step ST701). Details of step ST701 will be described later.
  • step ST701 If the condition is satisfied (Yes in step ST701), it is determined that the communication quality can be maintained even if the DCH with the base station that does not support E-DCH is released, and the process ends. . If the condition is not satisfied (No in step ST701), it is determined that the communication quality cannot be maintained if the DCH with the base station that does not support E-DCH is released. Then, the base station controller is notified that the base station cannot be deleted from the active set. A signal notifying the evaluation result can be transmitted in the physical layer. It is also possible to multiplex and transmit on control channels such as DPCCH and E-DPCCH.
  • the "state" defined for the uplink data channel (DCH) data transmission format (TFC: Transport Format Combination) is referred to. It is possible. For example, user data transmitted on a physical channel such as DPDCH is transmitted from an upper layer such as a MAC (Media Access Control) layer to a physical layer via a transport channel. Such physical channels are multiplexed with a number of transport channel forces S.
  • the power of the upper protocol layer is communicated. The power to transmit the data multiplexing method and the data size (communication speed) per unit time on DPCCH and notify the receiver TFC Is notification information including “data multiplexing method” and “data size”.
  • TFCI TFC Index
  • State transitions (Support, Excess Power, Block) are defined for each TFC, and the “state” is selected according to the transmission power margin of the mobile station.
  • Excess-Power is a state in which power shortage is detected for a certain period of time
  • Unavailable (Block) is a state in which transmission is restricted due to power shortage
  • “Support” indicates a state where a power shortage has occurred, particularly, a state. These three states are transitioned when the transmitted data reaches the maximum transmission power (Pmax). If the maximum transmission power is reached, for example, from “Support” to “Power over (Pmax).
  • the maximum transmission rate can be lowered by transitioning from “Excess-Power” or “Excess-Power” to “Block”.
  • step ST700 and step ST701 detects “Support”, it evaluates that the remaining transmission power of the mobile station has a margin (Yes in step ST701) and “Excess (Excess)”. -Power) "or” Unavailable (Block) "is detected, it is evaluated that the remaining transmission power of the mobile station is insufficient (No in step ST701).
  • the mobile station determines whether the DCH with the Rel6-compatible base station can be maintained even if the DCH with the Rel5- or R99-compatible base station is released. Referring to the status, evaluate whether the communication quality of DCH with the Rel6-compatible base station can be secured, and notify the base station controller.
  • the base station controller updates the active set according to the evaluation result transmitted from the mobile station.
  • FIG. 8 is a flowchart showing a second method of the communication quality evaluation process executed in step ST504 of FIG.
  • the base station evaluates the uplink communication quality and notifies the base station controller, and the base station controller removes the base station not compatible with Rel6 from the active set. In this state, it is judged whether the communication quality of DCH can be maintained.
  • steps ST800 to ST803 are processes executed by the base station
  • steps ST804 to ST806 are processes executed by the base station controller.
  • the base station receives the uplink control channel (DPCCH) transmitted from the mobile station (step ST800).
  • DPCCH uplink control channel
  • the base station determines whether the communication quality of each received uplink control channel satisfies the condition, that is, whether the communication quality exceeds a predetermined level (step ST801). For example, the base station uses SIR (Signal to Interference ratio) as a threshold as a criterion for judging communication quality. This threshold is temporarily called the target SIR.
  • the base station obtains a received SIR from the received uplink control channel, and compares the received SIR with the target SIR to determine whether the quality of the upper control channel satisfies a predetermined level.
  • SIR Signal to Interference ratio
  • step ST804 executed by the base station controller is executed.
  • step ST802 determines whether there is room for improving the communication quality of the uplink control channel.
  • TPC Transmitter Power Control
  • the base station transmits a TPC command to the mobile station in order to control the transmission power of the mobile station.
  • the TPC command that instructs the receiving SIR to reach the target SIR
  • a TPC command (hereinafter referred to as the DOWN command) that indicates “D 0 WN” is transmitted.
  • the mobile station receives and decodes the TPC transmitted from the base station, and changes the transmission power by ldB according to the command.
  • the mobile station increases the transmission power as long as the transmission power does not exceed the maximum transmission power (Pmax).
  • Pmax maximum transmission power
  • the mobile station transmits at the maximum transmission power and the communication quality of the received signal received at the base station is not good, the mobile station cannot expect improvement in communication quality by increasing the transmission power.
  • step ST802 if the base station does not continuously transmit the UP command to the mobile station or transmits the DOWN command, the base station can improve the communication quality from the mobile station. Judge (Yes in step ST802). On the other hand, if the communication quality from the mobile station is not good despite the base station sending an UP command to the mobile station, the base station estimates that the communication quality from the mobile station cannot be improved. (No in step ST802). In this case, the base station transmits an event (or notification signal) to the base station control apparatus to notify that the uplink communication quality from the mobile station cannot be improved (step ST803). The base station controller determines whether an event indicating that communication quality cannot be improved has been transmitted from all of the base stations communicating with the predetermined mobile station (step ST804).
  • step ST804 If all base stations included in the active set of the predetermined mobile station are transmitting events (Yes in step ST804), the mobile station is disconnected by disconnecting the radio link with any of the base stations. May not be able to communicate. Therefore, in order to add E-DCH, it is determined that communication quality cannot be secured if DCH with a base station that does not support E-DCH is disconnected (step ST805), and step 505 in FIG. Execute the process. On the other hand, if an event has not been notified from all the base stations included in the active set of the mobile station (No in step ST804), the base station that has not notified the event is compatible with release 6. (Step 806).
  • Step ST806 Figure 5 Step ST506 shown is executed.
  • the base station that notified the event is release 6 (No in step ST806), the communication quality with the release 6 compatible base station is not good, so it is difficult to set E-DCH in the first place. — The core network is notified that DCH is unavailable (step 507).
  • the communication system according to the present invention removes Rel5 and R99 base stations that do not support E-DCH from the active set when the mobile station performs E-DCH transmission.
  • E— DCH transmission is preferentially executed.
  • E-DCH transmission is performed, by removing the Re and R99 base stations that do not support E-DCH from the active set, they can be used in communication systems with mixed versions of base stations. There is an effect that the active channel is not restricted.
  • the communication system according to the present invention reduces the amount of interference in the cell because E-DCH assigned to the mobile station by scheduling is used when transmitting a large amount of data. This has the effect of improving the overall system throughput.
  • the mobile station can transmit a large amount of data using E-DCH over DCH, there is an effect that data transmission can be completed in a short time.
  • the base station control device includes the Re
  • the process of determining whether the DCH communication quality with the base station corresponding to E-DCH can be maintained in a state where the DCH with the base station not supporting E-DCH is removed. Is performed based on the transmission power margin of the mobile station.
  • the above determination may be made using “path loss”. Specifically, focusing on the point that the quality is matched to the radio link with the least path loss during soft handover, the path loss (L1) of the radio link removed from the active set and the path loss of the other radio link are the smallest. , With path loss (L2) If the difference is negative (LI_L2 ⁇ 0), the remaining transmittable power equal to or greater than the difference is used as the threshold value.
  • the base station controller performs an active set determination process for determining whether it is possible to remove the R e and R99 base stations that do not support E-DCH from the active set.
  • the mobile station may execute the process of determining whether a base station that does not support E-DCH may be removed from the active set.
  • FIG. 9 is a block diagram of mobile stations constituting the communication system according to Embodiment 2 of the present invention.
  • FIG. 10 is a flowchart illustrating soft handover control processing in the communication system according to Embodiment 2 of the present invention.
  • the control unit 900 sets a channel.
  • the protocol processing unit 901 performs protocol processing such as channel setting and release.
  • DPCH (Dedicated Physical Channel) addition / deletion section 902 controls setting, addition and deletion of DPCH.
  • DPCH is a physical channel to which DCH, which is a transport channel, is mapped.
  • DPCH transmission section 9 03 performs processing for transmitting DPCH such as channel coding.
  • the E-DCH addition Z deletion unit 904 controls the setting, addition, and deletion of the E-DCH in the same manner as the DPCH addition Z deletion unit 902.
  • the E-DCH transmission unit 905 performs processing for transmitting the E-DCH, similar to the DPCH transmission unit 903.
  • the modulation unit 906 modulates signals such as DCH and E-DCH.
  • the power amplification unit 907 amplifies the desired power.
  • the antenna 908 transmits and receives signals.
  • the low noise amplification unit 909 amplifies a weak signal received by the antenna 908.
  • Demodulation section 910 demodulates DPCH, CPICH (Common Pilot Channel) and the like.
  • CPICH receiver 911 receives the common pilot signal.
  • Broadcast information receiving section 912 receives a scrambling code necessary for identifying a base station and version information corresponding to each scrambling code.
  • the path loss measurement unit 913 obtains a propagation loss (path loss) from the CPICH reception level.
  • Base station version information tube The management unit 914 stores version information of each base station.
  • the active set information management unit 915 stores which base station is in the active set based on the CPICH information.
  • Active set control section 916 controls active set determination processing based on active set information and base station version information.
  • the event generation unit 917 creates an active set control event and transmits it to the protocol processing unit.
  • Base station version information determination section 918 determines the version of the base station based on the information stored in base station version management section 914.
  • Receiving section 919 performs processing on the received DPCH.
  • the detection unit 920 detects the received uplink transmission power.
  • a base station version information management unit 914 and a base station version information determination unit 918 are newly provided in the terminal according to the present invention.
  • the base station control apparatus notifies the mobile station of the specifications supported by the base station included in the active set (step ST1000).
  • a scrambling code is used as identification information for identifying the base station.
  • the base station control device informs the mobile station that an instruction to set E-DCH has been generated from the core network. Notify (step ST1002).
  • the mobile station that is instructed to set E-DCH reads the active set managed by the mobile station itself. Then, among the base stations recorded in the active set, a base station that does not support E-DCH (base station compatible with Rel5 or R99) is identified, and active set determination processing is performed to determine whether to remove from the active set. Perform (step ST1003).
  • This active set determination process includes a process for evaluating communication quality when DCH is disconnected from a base station that does not support E-DCH.
  • the mobile station transmits a notification signal to the base station controller (step ST1004).
  • This notification signal includes information notifying that the E_DCH is not used when it is determined that the base station from which the active set power is deleted or E-DCH cannot be used.
  • the base station controller determines whether the mobile station does not use E-DCH based on the notification signal transmitted from the mobile station (step ST1005). If the mobile station does not use E—DCH (Yes in step ST1005), E Stop using the _DCH bearer and notify the core network that E—DCH cannot be set (step ST1012).
  • the base station controller releases the DCH to the base station designated by the mobile station so as to be deleted from the active set. Instruct (step ST1007). Also, the mobile station is instructed to release the DCH with the base station using the RRC (Radio Resource Control) protocol (step ST1006). In response to an instruction from the base station controller, the mobile station and the base station each release the DCH (steps ST1007 and 1008). Then, the base station controller instructs the base station recorded in the active set using the NBAP protocol to set E-DCH with the mobile station. At the same time, the mobile station is instructed to set up E-DCH with the base station using the RRC protocol (step ST1009).
  • RRC Radio Resource Control
  • FIG. 11 shows the base station that the base station controller notifies the mobile station. It is explanatory drawing explaining station version information.
  • the base station version information shown in FIG. 11 includes a scrambling code, which is information for identifying a plurality of base stations existing around the cell where the mobile station is located, and standards corresponding to these base stations. The version is associated. Since one scrambling code is always assigned to each base station, it is suitable for identifying the base station.
  • a method in which the base station controller notifies the mobile station of version information of the base station will be described.
  • a common channel or a dedicated channel can be considered as a channel used by the base station controller.
  • BCH Broadcast Channel
  • DCH Downlink Control Channel
  • FIG. 12 is a flowchart for explaining active set determination processing executed by the mobile station.
  • FIG. 12 is a flowchart showing details of the active set determination process in step ST1003 shown in FIG.
  • the mobile station When receiving the E-DCH setting request notification from the base station controller, the mobile station refers to the base station version information (step ST1200) and selects one base station that does not support E-DCH (step ST1201). Then, when the selected E-DCH incompatible base station is deleted from the active set, the mobile station determines whether or not DCH communication quality with the E-DCH compatible base station can be secured (step ST1202).
  • the processing in step 1202 is the same as that performed based on the transmission power margin of the mobile station described in the first embodiment, and a description thereof will be omitted.
  • step ST1202 If the E—DCH incompatible base station is deleted from the active set and the DCH communication quality with the E—DCH compatible base station cannot be maintained (No in step ST1202), the E—DCH incompatible base station is set to the active set. The DCH with the base station not supporting E—DCH is maintained (step ST1203). On the other hand, if the communication quality of DCH with the E-DCH compatible base station can be maintained even if the E-DCH non-compliant base station is removed from the active set (Yes in step ST1202), the E-DCH non-compliant base station Is deleted from the active set (step ST1204).
  • step ST1203 to step ST1204 it is determined whether all base stations stored in the active set have been checked (step ST1205). If there are unchecked base stations remaining (No in step ST1205). ), The process after step ST1201 is repeated. If there are no unchecked base stations remaining (Yes in step ST1205), the mobile station ends the active set determination process and executes the notification signal transmission process in step ST1004 in FIG. In step ST1004, if the E—DCH incompatible base station is deleted from the active set and the DCH communication quality with the E—DCH compatible base station cannot be maintained (No in step ST1202), the mobile station Transmits to the base station control device as a notification signal that E-DCH is not used.
  • the mobile station has been deleted from the active set.
  • the base station is sent as a notification signal to the base station controller.
  • the mobile station performs E-DCH transmission.
  • Rel5 and R99 base stations that do not support E-DCH are removed from the active set, and E-DCH transmission is preferentially executed.
  • E-DCH transmission is preferentially executed.
  • the communication system according to the present invention reduces the amount of interference in a cell because E-DCH assigned to a mobile station by scheduling is used when transmitting a large amount of data. This has the effect of improving the overall system throughput.
  • the mobile station can transmit a large amount of data using E-DCH over DCH, there is an effect that data transmission can be completed in a short time.
  • the communication for example, DCH
  • the communication for example, DCH
  • Active set decision processing is performed in consideration of whether it can be maintained (or the ability to ensure quality), preventing E- DCH from being set between E-DCH compatible base stations and mobile stations with poor communication quality it can. Therefore, it is possible to prevent the problem that communication is interrupted during E-DCH transmission.
  • the mobile station performs the active set determination process, so that the number of signaling to the base station controller can be reduced.
  • the mobile station since the mobile station bears the function of the base station controller, it is possible to reduce the overload of the base station controller and prevent problems such as congestion.
  • Embodiment 1 when a mobile station communicates with a plurality of base stations using DCH, the base station controller determines the active set when the core network is instructed to set E-DCH. We were processing. In some cases, the base station controller performs the active set determination process when the mobile station in communication using E-DCH moves to a cell of a base station that does not support Rel6. . In the following, the active set determination process of the base station controller executed when a mobile station in communication using E-DCH moves to a cell of a base station that does not support Rel6 will be described.
  • FIG. 13 is a flowchart illustrating soft handover control processing in the mobile communication system according to Embodiment 3 of the present invention.
  • step ST1300 when a mobile station that is transmitting data with a Rel6-compatible base station using E-DCH moves to a cell managed by another base station, the reception level reaches the standard.
  • the mobile station transmits an event to the base station controller so as to add the base station of the destination cell to the active set (step ST1301).
  • the base station controller determines whether the base station notified to be added to the active set supports E-DCH, that is, supports Rel6 (step ST1302). If the base station notified from the mobile station can use E-DCH, for example, if it supports Rel6 (Yes in step ST1302), the active set should be added to add the base station to the active set. Change and instruct the terminal and the base station to set the DCH (step ST1303).
  • the base station and mobile station instructed to set the DCH by the base station controller each set the DCH (steps ST1304 and 1305).
  • the base station control device It is determined that the notified base station cannot be added to the active set. Then, the reason why it cannot be added to the active set is transmitted to the base station and mobile station (step ST1306). In this way, the reason why the base station and the mobile station are notified of the reason why they cannot be added to the active set is to prevent the terminal from excessively reducing the criteria for determining the necessity of handover.
  • the mobile station power transmitting E-DCH enters a cell under the jurisdiction of a base station that cannot use E-DCH.
  • the base station of the destination cell is not added to the active set.
  • the mobile station communicates with multiple base stations using DCH.
  • the base station controller performs the active set determination process.
  • the mobile station itself performs the active set determination process when the mobile station in communication moves to a base station cell that does not support Rel6 using E-DCH.
  • the active set determination process executed when a mobile station in communication using E-DCH moves to a cell of a base station that does not support Rel6 will be described.
  • FIG. 14 is a flowchart illustrating soft handover control processing in the mobile communication system according to Embodiment 4 of the present invention.
  • the mobile station transmits data to the Rel6-compatible base station using the ED CH (step ST1400), and the base station controller transmits the base station version information shown in FIG. 8 to the mobile station.
  • Notify step 1401.
  • Mobile station power transmitting E—DCH When moving to a cell under the control of another base station, the base station of the target cell can determine whether it can use E-DCH by referring to the base station version information ( Step ST1402).
  • step ST1402 If the base station of the target cell supports Re or R99 (Yes in step ST1402), the mobile station sends a notification requesting to add the base station of the target cell to the active set to the base station controller. The process ends without doing so. On the other hand, if the base station of the destination cell supports Rel6 (No in step 1402), the mobile station sends a notification requesting that the base station of the destination cell be added to the active set to the base station controller. Send (step ST1403).
  • the base station controller receives the notification from the mobile station, the base station controller adds the designated base station to the active set and instructs the base station and the mobile station to set DCH (step ST1404).
  • the mobile station and the base station each set a DCH (steps ST1405 and 1406).
  • the scrambling code for identifying the base station is associated with the version of the standard corresponding to the base station, and is notified from the base station controller to the mobile station via BCH or DCH.
  • the mobile station refers to the base station version information using the scrambling codes of the destination cell and the base station of the neighboring cell, and determines whether the destination cell and the neighboring cell are compatible with E-DCH. To do.
  • E Mobile station power transmitting DCH
  • E Do not add the base station of the target cell to the active set when a base station that cannot use DCH enters the cell.
  • the mobile station since the mobile station performs the active set determination process, the number of signaling to the base station control device can be reduced. Further, since the mobile station bears the function of the base station controller, it is possible to reduce the overload of the base station controller and prevent problems such as congestion.
  • the present invention can be applied to a terminal and a base station control device that perform soft handover and selective combination of received signals in a communication system in which base stations of different versions coexist.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système selon lequel il existe des stations de base correspondant à des versions différentes de normes, telles que les normes R99, Rel5 et Rel6, système pouvant ne comporter qu'un nombre limité de canaux disponibles. L'invention porte également sur un procédé de commande de transfert où il est déterminé si une station de base quelconque sélectionnée parmi des appareils actifs est une station pour laquelle un gestionnaire E-DCH peut être établi. On détermine ensuite si la qualité de communication de la liaison sans fil avec une station de base quelconque, pour laquelle le gestionnaire E-DCH peut être établi, peut être maintenue alors que les liaisons sans fil avec les autres stations de base, pour lesquelles le gestionnaire E-DCH ne peut pas être établi, sont ouvertes. Si la qualité de communication peut être maintenue, le gestionnaire E-DCH est utilisé pour établir une communication avec la station de base compatible avec le gestionnaire E-DCH, alors que les liaisons sans fil avec les autres stations de base, pour lesquelles le gestionnaire E-DCH ne peut pas être établi, sont ouvertes.
PCT/JP2005/005821 2005-03-28 2005-03-29 Procede de commande de transfert, appareil de commande de station de base et station mobile WO2006106561A1 (fr)

Priority Applications (22)

Application Number Priority Date Filing Date Title
PCT/JP2005/005821 WO2006106561A1 (fr) 2005-03-29 2005-03-29 Procede de commande de transfert, appareil de commande de station de base et station mobile
AU2006229008A AU2006229008C1 (en) 2005-03-28 2006-01-27 Mobile communications system, handover controlling method, radio network controller and mobile terminal
KR1020077010102A KR20070053823A (ko) 2005-03-28 2006-01-27 이동체 통신 시스템, 핸드 오버 제어 방법, 기지국제어장치 및 이동 단말
EP10172839.2A EP2252108A3 (fr) 2005-03-28 2006-01-27 SystÀ¨me de communication mobile, procédé de contrôle de transfert, contrôleur de station de base et terminal mobile
US11/666,301 US8050222B2 (en) 2005-03-28 2006-01-27 Mobile communications system, handover controlling method, radio network controller, and mobile terminal
PCT/JP2006/301353 WO2006103823A1 (fr) 2005-03-28 2006-01-27 Systeme de communication d’objet mobile, procede de commande de transfert intercellulaire, appareil de commande de stations de base et terminal mobile
EP10172838A EP2254372A1 (fr) 2005-03-28 2006-01-27 Système de communication mobile, procédé de contrôle de transfert, contrôleur de réseau radio et terminal mobile
EP10172835.0A EP2252106B1 (fr) 2005-03-28 2006-01-27 Système de communication mobile, procédé de contrôle de transfert, contrôleur de réseau radio et terminal mobile
JP2007510326A JPWO2006103823A1 (ja) 2005-03-28 2006-01-27 移動体通信システム、ハンドオーバー制御方法、基地局制御装置及び移動端末
KR1020097004696A KR101103213B1 (ko) 2005-03-28 2006-01-27 통신 장치
CN200680001161.6A CN101053276B (zh) 2005-03-28 2006-01-27 移动体通信系统、移交控制方法、基站控制装置及移动终端
KR1020077009824A KR100864893B1 (ko) 2005-03-28 2006-01-27 액티브 셋트 제어방법
KR1020087018824A KR100921511B1 (ko) 2005-03-28 2006-01-27 이동체 통신 시스템, 핸드 오버 제어 방법, 기지국제어장치 및 이동 단말
EP10172834.3A EP2252105B1 (fr) 2005-03-28 2006-01-27 Système de communication mobile, procédé de contrôle de transfert, contrôleur de réseau radio et terminal mobile
EP06712519A EP1802161B1 (fr) 2005-03-28 2006-01-27 Systeme de communication d`objet mobile, procede de commande de transfert intercellulaire, appareil de commande de stations de base et terminal mobile
JP2007021518A JP2007151167A (ja) 2005-03-28 2007-01-31 移動体通信システム、ハンドオーバー制御方法、基地局制御装置及び移動端末
JP2007272869A JP4840326B2 (ja) 2005-03-28 2007-10-19 移動端末
HK08101904.5A HK1111550A1 (en) 2005-03-28 2008-02-21 Mobile object communication system, handover control method, base station control apparatus and mobile terminal
AU2009201166A AU2009201166B2 (en) 2005-03-28 2009-03-24 Mobile communications system, handover controlling method, radio network controller and mobile terminal
JP2010254645A JP2011035943A (ja) 2005-03-28 2010-11-15 アクティブセット制御方法
JP2011141817A JP2011188534A (ja) 2005-03-28 2011-06-27 アクティブセット制御方法
US13/172,309 US8355375B2 (en) 2005-03-28 2011-06-29 Mobile communications system, handover controlling method, radio network controller, and mobile terminal

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JP2009253397A (ja) * 2008-04-02 2009-10-29 Nec Corp 移動体通信システム、通信装置及びそれらに用いる仕様書のバージョン情報通知方法
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GB2493724B (en) * 2011-08-15 2015-01-07 Broadcom Corp Wireless communications cell reselection
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