WO2006013630A1 - 基地局、移動通信端末装置およびプライマリセル選択方法 - Google Patents
基地局、移動通信端末装置およびプライマリセル選択方法 Download PDFInfo
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- WO2006013630A1 WO2006013630A1 PCT/JP2004/011254 JP2004011254W WO2006013630A1 WO 2006013630 A1 WO2006013630 A1 WO 2006013630A1 JP 2004011254 W JP2004011254 W JP 2004011254W WO 2006013630 A1 WO2006013630 A1 WO 2006013630A1
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- base station
- radio link
- state information
- terminal
- scheduling
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Definitions
- Base station mobile communication terminal apparatus and primary cell selection method
- the present invention relates to a base station and a mobile communication terminal apparatus that perform communication using a W-CDMA (Wideband Code Division Multiple Access) system, and in particular, to select a primary cell that performs scheduling to a terminal. Regarding the method.
- W-CDMA Wideband Code Division Multiple Access
- Patent Document 1 For a method for detecting link imbalance, Patent Document 1, for a system that selects a primary cell based on the communication quality of the uplink transmission path, Patent Document 2, a primary cell based on the communication quality of the downlink transmission path is selected.
- the system to be selected is disclosed in Non-Patent Document 1.
- Patent Document 1 Japanese Translation of Special Publication 2002-527963
- Patent Document 1 discloses a method and apparatus for detecting link imbalance. Has been. However, Patent Document 1 discloses a method used in a system called IS-95. Specifically, a terminal called a maximum access probe connects to a base station. This is a method to determine the occurrence of link imbalance in a protocol based on the number of attempts.
- Patent Document 2 Japanese Translation of Special Publication 2003-510862
- Patent Document 2 discloses that a base station control device selects a predetermined base station in order to perform downlink packet communication. This base station controller selects a predetermined base station based on the communication quality of the uplink transmission line such as SIR (Signal to Interference Ratio) measured by the base station and transmitted to the base station controller. is there.
- the base station control device disclosed in Patent Document 2 does not consider the communication quality of the downlink transmission path when selecting a base station.
- the base station control device disclosed in Patent Document 2 selects a predetermined base station based on the SIR transmitted from the base station. The base station controls the SIR from the base station to the base station control device. Since transmission time is significant, there is a problem that an appropriate base station cannot be selected in an environment where the communication quality of the uplink transmission line fluctuates drastically.
- Non-Patent Document 1 3GPP RANI Document R1-—040492
- Non-Patent Document 1 suggests a terminal that determines a primary cell for scheduling. Specifically, it is mentioned that the terminal selects the primary cell based on the path loss and the uplink load amount.
- the terminal selects the primary cell based on the quality of the downlink transmission path.
- the quality of the uplink transmission path to the base station is not good.
- the main object of the present invention is to provide a base station and a mobile communication terminal apparatus that improve the throughput of the entire system by selecting a primary cell particularly considering link imbalance. Also, when link imbalance occurs, switching between cell selection and HARQ method selection ensures the communication quality of the uplink transmission path, and ACK / Downstream power required for NACK transmission can be reduced, and throughput can be improved.
- the present invention has been made to solve the above problems, and in order to select a primary cell that avoids link imbalance and to ensure quality in accordance with the number of links and their link quality. Increase throughput by selecting an appropriate hybrid ARQ method. Furthermore, it aims at providing the mobile communication system using the terminal which implement
- the base station performs scheduling for allocating radio resources to the mobile station in response to a radio resource allocation request transmitted from the mobile station and transmitted via the uplink radio link, and performs this scheduling.
- the base station notifies the mobile station via the downlink radio link.
- the base station receives the transmitted signal from the mobile station and estimates the uplink radio link state, and the mobile station performs measurement.
- a downlink radio link status information receiving unit that receives status information indicating the status of the downlink radio link received, and the downlink radio link status information receiving unit receives status information, and the uplink radio link status estimation unit estimates Scheduling to allow scheduling to the mobile station when the uplink radio link status satisfies the preset scheduling permission condition. And a ring permission determination unit.
- the mobile communication terminal apparatus When performing data transmission, the mobile communication terminal apparatus according to the present invention notifies a scheduling request signal for requesting radio resource allocation to a base station via an uplink transmission path, and transmits the downlink transmission path.
- a signal transmitted from at least one base station is received and the state of the downlink radio link is A downlink radio link state estimating unit for estimating the state, an uplink radio link state information receiving unit for receiving state information indicating an uplink radio link state measured in at least one base station, and an uplink radio link state information receiving unit
- a cell selection unit that selects a base station that has received state information and that satisfies a predetermined condition of a downlink radio link state; and It is provided with a transmission unit for transmitting the scheduling request signal to the-option base stations.
- a primary cell selection method includes an uplink radio link state estimation step of receiving a signal transmitted from a mobile station and estimating an uplink radio link state from the mobile station to the base station; A downlink radio link status information transmission step for receiving a signal transmitted from the base station and transmitting status information indicating the status of the downlink radio link from the base station to the mobile station to the mobile station power base station; Determine whether the downlink radio link status information transmitted in the link status information transmission step and the uplink radio link status estimated in the uplink radio link status estimation step satisfy a predetermined scheduling permission condition.
- a scheduling permission determining step for permitting scheduling to allocate radio resources to the mobile station, and this schedule Scheduling is performed for the mobile station that is permitted to be scheduled in the ringing permission determination step, the scheduling result notification step for notifying the mobile station of the scheduling result, and the mobile station that has received the scheduling result determines the base station as the primary cell, And a data transmission step of transmitting data to the base station.
- a primary cell selection method includes a downlink radio link state estimation step of receiving a signal transmitted from a base station and estimating a downlink radio link state from the base station to the mobile station; Mobile station power An uplink radio link status information transmission step for receiving a transmitted signal and transmitting status information indicating the status of the uplink radio link from the mobile station to the base station to the mobile station.
- Cell selection step for selecting a base station that satisfies the conditions set in advance by the uplink radio link status information transmitted by the link status information transmission step and the downlink radio link status estimated by the downlink radio link status estimation step
- the base station performs scheduling for allocating radio resources to the mobile station in response to a radio resource allocation request transmitted from the mobile station and transmitted via the uplink radio link, and performs this scheduling.
- the base station notifies the mobile station via the downlink radio link.
- the base station receives the signal transmitted by the mobile station and estimates the uplink radio link status.
- An uplink radio link state estimation unit to be determined, a downlink radio link state information reception unit to receive state information indicating the state of the downlink radio link measured in the mobile station, and the downlink radio link state information reception unit to receive the state information.
- a scheduling permission determining unit that permits scheduling to the mobile station when the uplink radio link state received by the uplink wireless link state estimating unit satisfies a preset scheduling permission condition. Therefore, considering the occurrence of link imbalance, the mobile station to be scheduled can be selected appropriately.
- the mobile communication terminal apparatus When performing data transmission, the mobile communication terminal apparatus according to the present invention notifies a scheduling request signal for requesting radio resource allocation to a base station via an uplink transmission path, and transmits the downlink transmission path.
- a signal transmitted from at least one base station is received and the state of the downlink radio link is
- a downlink radio link state estimating unit for estimating the state
- an uplink radio link state information receiving unit for receiving state information indicating an uplink radio link state measured in at least one base station
- an uplink radio link state information receiving unit A cell selection unit that selects a base station that has received state information and that satisfies a predetermined condition of a downlink radio link state; and Since there is provided a transmitter which transmits the scheduling request signal to the-option base stations can select the proper primary cell in consideration of the occurrence of a link imbalance.
- a primary cell selection method includes an uplink radio link state estimation step of receiving a signal transmitted from a mobile station and estimating an uplink radio link state from the mobile station to the base station; A downlink radio link status information transmission step for receiving a signal transmitted from the base station and transmitting status information indicating the status of the downlink radio link from the base station to the mobile station to the mobile station power base station; Determine whether the downlink radio link status information transmitted in the link status information transmission step and the uplink radio link status estimated in the uplink radio link status estimation step satisfy a predetermined scheduling permission condition.
- the primary cell can be appropriately selected in consideration of the occurrence of link imbalance.
- a primary cell selection method includes a downlink radio link state estimation step of receiving a signal transmitted from a base station and estimating a downlink radio link state from the base station to the mobile station; Mobile station power An uplink radio link status information transmission step for receiving a transmitted signal and transmitting status information indicating the status of the uplink radio link from the mobile station to the base station to the mobile station.
- Cell selection step for selecting a base station that satisfies the conditions set in advance by the uplink radio link status information transmitted by the link status information transmission step and the downlink radio link status estimated by the downlink radio link status estimation step
- a transmission step for transmitting a scheduling request signal to the base station selected by this cell selection step, and a mobile station that has received the scheduling result.
- the station is determined as the primary cell and the data transmission step of transmitting data to the base station is executed, so that it is possible to appropriately select the mobile station to be scheduled in consideration of the occurrence of link imbalance. it can.
- FIG. 1 is an explanatory diagram showing a configuration of a communication system.
- FIG. 2 is an explanatory diagram of a channel connecting a terminal and a base station.
- FIG. 3 is a block diagram showing a configuration of a base station according to the first exemplary embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing a situation where a terminal and one primary cell are wirelessly connected.
- FIG. 5 is an explanatory diagram showing a situation where a terminal and one or more primary cells are wirelessly connected.
- FIG. 6 is a block diagram showing a configuration of a mobile communication terminal apparatus that communicates with the base station shown in FIG.
- FIG. 7 is an explanatory diagram showing a situation of a communication system in which link imbalance has occurred.
- FIG. 8 is a flowchart for explaining a primary cell selection process in consideration of vertical quality, which is executed by the base station according to Embodiment 1 of the present invention.
- FIG. 9 is a flowchart for explaining a modified example of the primary cell selection process in consideration of the upper and lower quality, executed by the base station according to Embodiment 1 of the present invention.
- FIG. 11 is a diagram showing a format of a signal for notifying a base station of a selected penalty coefficient.
- FIG. 12 is an explanatory diagram showing a comparative example when a primary cell is selected without using a selection penalty coefficient and when a primary cell is selected using a selection penalty coefficient. 13) A flowchart illustrating the primary cell selection process for adjusting the threshold on the base station side according to the communication quality of the downlink transmission path.
- FIG. 14 is a diagram showing a format of a signal for notifying a base station of a threshold value.
- FIG. 15 is a block diagram showing a configuration of a terminal according to Embodiment 2 of the present invention.
- FIG. 16 is a block diagram showing a configuration of a base station that communicates with the mobile communication terminal apparatus shown in FIG.
- ⁇ 17 A flowchart showing a primary cell selection process by the mobile communication terminal apparatus according to the second embodiment of the present invention.
- FIG. 18 is a flowchart for explaining a modification of the primary cell selection process in consideration of vertical quality, which is executed by the mobile communication terminal apparatus according to Embodiment 2 of the present invention.
- FIG. 19 is a flowchart illustrating selection penalty coefficient determination processing by the base station.
- This is a diagram showing the format of a signal for transmitting a selection penalty coefficient and a threshold up / down command to the terminal.
- ⁇ 21] is a flowchart for explaining a modification of the primary cell selection process in consideration of vertical quality, which is executed by the mobile communication terminal apparatus according to Embodiment 2 of the present invention.
- FIG. 22 is an explanatory diagram for explaining the characteristics of Chase Combining and IR.
- FIG. 23 is an explanatory diagram illustrating a state in which a terminal communicates with a plurality of base stations and is performing macro selection / combination.
- FIG. 24 is a block diagram showing a configuration of a mobile communication terminal apparatus according to Embodiment 3 of the present invention.
- FIG. 26 is an explanatory diagram showing a format of a signal transmitted by the terminal to notify the HARQ scheme.
- FIG. 27 is an explanatory diagram showing a case where the terminal is in the SHO state in which it communicates with a plurality of base stations and the communication quality of each link is poor.
- FIG. 28 is a flowchart explaining a process in which the terminal switches the HARQ method to macro selection / synthesis power to IR.
- FIG. 29 is an explanatory diagram showing a format of a signal for notifying the base station that the terminal mode uses the IR mode.
- FIG. 30 is a flowchart showing processing of a base station that selects a primary cell based on communication quality of an uplink transmission path.
- FIG. 31 is an explanatory diagram showing the format of a signal for notifying the base station of the communication quality of the downlink transmission path.
- FIG. 1 is an explanatory diagram showing a configuration of a packet communication system.
- the terminal 100 is a device used by the user.
- Terminal 100 is one or more of a plurality of base stations 101a, 101b, 101c. Communicate with numbers and wirelessly.
- the base stations 101a, 101b, 101c are connected to the network side (public line network or the like) via the base station controller 102.
- SHO soft handover
- terminal 100 can perform a process called soft handover (hereinafter referred to as SHO) in which radio links are held with a plurality of base stations.
- SHO soft handover
- terminal 100 is called UE (User Equipment)
- base station 101 is called Node-B
- base station controller 102 Radio Network Controller
- scheduling may be performed for a terminal with a specific base station.
- the base station in charge of scheduling may be called the primary cell or the serving cell.
- the term cell is also used as an alias for a base station.
- FIG. 2 is an explanatory diagram showing a channel configuration of the packet communication system.
- the channel configuration in the wireless section between terminal 100 and base station 101 in the W-CDMA system will be described.
- the channel name is a temporary name and may be changed in the future.
- multiple control channels can be combined into a single channel as an actual channel usage.
- the downlink channel from the base station to the terminal will be described with reference to FIG.
- CPICH Common Pilot Channel
- P-CCPCH Primary-Common Control Physical Channel
- S-CCPCH Secondary-Common Control Physical Channel
- DL-E-DPCCH is used for transmission of control information for notifying the allocation position by the scheduler for transmission of control information, as used for uplink bucket communication.
- Downlink Enhancement-Dedicated Physical Control Channel 205
- ACK / NACK Ack / Nack Channel
- FIG. 2 will be used to explain the uplink channel for the base station and the terminal power.
- UL—E—DPCCH () that transmits control information to notify the base station scheduler of the terminal status, such as the presence or absence of transmission data of the terminal
- the E-TFCI 206 notifies the transport format of the E-DCH 207 transmitted from the terminal 100 to the base station 101.
- Base station 101 performs demodulation based on the transport format of E-DCH 207 transmitted from terminal 100 via E-TFCI 206. Note that this E TFCI 206 may be combined with the UL-E-DPCCH 204, which may be an independent channel. It may also be shared with the conventional DPCCH channel.
- DPCH Dedicated Physical Channel
- the DPCH 203 may be handled as a physical channel divided into a DPDCH (Dedicated Physical Data channel) that transmits bits related to data and a DPCCH (Dedicated Physical Control channel) that transmits bits related to control.
- DPDCH Dedicated Physical Data channel
- DPCCH Dedicated Physical Control channel
- FIG. 3 is a block diagram showing the configuration of the base station according to Embodiment 1 of the present invention.
- a modulation unit 400 multiplexes and spreads the signals of each channel and modulates them to a desired carrier wave.
- the power amplification unit 401 amplifies the signal output from the modulation unit 400 to a desired transmission power.
- the signal amplified by the power amplifying unit 401 is transmitted to the mobile communication terminal device (hereinafter referred to as a terminal) via the antenna 402.
- the antenna 402 receives radio waves transmitted from the terminal.
- the received signal received by the antenna 402 is amplified to a level necessary for demodulation processing in the low noise amplification unit 403.
- Demodulation section 404 performs despreading processing on the signal transmitted from the terminal and received by the base station, using the same code as that used for spreading processing on the terminal side, and separates the original channel signal.
- the base station shown in FIG. 3 includes a control unit 405 and a protocol processing unit 406. Further, the base station shown in FIG. 3 controls DPCH receiving unit 407, interference amount measuring unit 408, SIR calculating unit 409, TPC command generating unit in order to individually control the transmission power of each terminal existing in the cell it is in charge of. 410 and DPCH transmission section 411 are provided. DPCH receiving section 407, interference amount measuring section 408, and SIR calculating section 409 are uplink radio link state estimating sections that receive signals transmitted from mobile stations and estimate uplink radio link conditions. The A control unit 405 controls data transfer and timing. The protocol processing unit 406 performs communication processing between the base station controller and the base station and also processes communication protocols.
- DPCH receiving section 407 extracts DP CCH data separated by the demodulation processing of demodulation section 404 and outputs the data to interference amount measurement section 408.
- the interference amount measuring unit 408 removes the received intensity from the low noise amplifying unit 403 and the known code signal from the demodulating unit 404, measures the interference amount, and sends the measurement result to the interference amount notifying unit 419 and the SIR calculating unit 409. Output to.
- Interference amount notification section 419 notifies the base station control apparatus of the interference amount measured by interference amount measurement section 408 via protocol processing section 400.
- SIR calculation section 409 calculates a signal-to-interference ratio (SIR) from the interference amount measured by interference amount measurement section 408.
- the SIR calculation unit 409 outputs the calculated SIR to the TPC command generation unit 410.
- the TPC command generation unit 410 compares the target SIR value for which the base station controller power is also specified with the current SIR value calculated by the SIR calculation unit 409. If the current SIR value is lower than the target SIR value, TPC command generation section 410 generates a TPC (Transmission Power Control) command that instructs the terminal to increase the transmission power.
- TPC Transmission Power Control
- TPC command generation section 410 If the current SIR value is higher than the S target SIR value, TPC command generation section 410 generates a TPC command that instructs the terminal to reduce the transmission power.
- DPCH transmission section 411 inserts the TPC command generated by TPC command generation section 410 into DPCCH and outputs it to modulation section 400 for transmission to the terminal.
- the base station shown in FIG. 3 includes an E-DPCCH receiving unit 412, a scheduling request information receiving unit 413, an uplink scheduler 414, and a scheduling information signaling unit 415.
- an E-DPCCH receiving unit 412 decodes the scheduling request information included in the E-DPCCH demodulated and separated by the demodulating unit 404 in order to obtain scheduling request information in which the terminal power is also transmitted.
- the decoded scheduling request information is extracted by the scheduling request information receiving unit 413 and input to the uplink scheduler 414.
- the uplink scheduler 414 performs scheduling when the terminal request is transmitted as scheduling request information.
- Scheduling refers to the timing of transmission from the base station to each terminal in response to a scheduling request notified from the terminal.
- This is a radio resource control process for allocating radio resources.
- the base station controls the radio resources so that the increase in transmission power from each terminal is within the transmission power margin so that the throughput of the entire cell becomes the highest when each terminal reflects the scheduling result.
- the terminal transmits a scheduling request including information such as the amount of transmission packet data to the base station.
- the base station allocates (schedules) radio resources based on the quality of the transmission path, the transmission power margin of the terminal, and the like, and notifies the scheduling result to the terminal through a downlink channel.
- the terminal transmits the packet data on the data transmission channel to the base station according to the scheduling result in which the base station power is also transmitted.
- the base station transmits the result information (ACKZNACK) of the reception determination result of the bucket data transmitted from the terminal to the terminal.
- ACKZNACK result information
- the terminal may be the scheduler of any base station that has good communication quality on the transmission path. Communication can be continued using.
- the terminal can also instruct a scheduling request to any one of the base stations according to the communication quality of the transmission path. For a terminal, there are multiple base stations that may perform scheduling, but the base station that schedules the terminal at a certain point in time is regarded as a primary cell.
- the uplink scheduler 414 provided in the base station shown in FIG.
- the scheduling information signaling unit 415 transmits the scheduling result to each terminal that has transmitted the scheduling request to the base station.
- £ -Ding? 1 receiver 416 receives the transport format, HARQ information, and the like.
- the HARQ reception processing unit 417 receives E-DCH including transmission packet data transmitted by the terminal according to the scheduling result transmitted from the base station.
- the response signal transmission unit 418 notifies the terminal of an ACK signal when the HARQ reception processing unit 417 is able to receive the transmission bucket data transmitted from the terminal without any problem, and a N ACK signal when it cannot be received. Output to the modulation unit 400.
- the uplink scheduler 414 performs a retransmission process for causing the terminal to transmit packet data again.
- the interference amount notification unit 419 notifies the base station control device of the interference amount measured by the base station.
- the base station according to Embodiment 1 of the present invention shown in FIG. 3 has a load amount notification unit 420, as a configuration necessary for the base station itself to determine whether it is a primary cell of a certain terminal.
- a schedule permission determining unit 421, a CPICH level receiving unit 422, a primary cell selection instruction receiving unit 423, and a threshold receiving unit 424 are provided.
- the schedule permission determination unit 421 determines whether or not it is in charge of the base station power scheduling using a scheduling permission condition such as a preset threshold value.
- CPICH level information receiving section 422 is a lower radio link state information receiving section that receives the CPICH reception level measured at the mobile station as state information indicating the state of the downlink radio link.
- Primary cell selection instruction receiving section 423 receives the instruction of the primary cell transmitted from the terminal.
- the load amount notification unit 420 obtains the operation status of the uplink scheduler 414 and notifies the base station control device of the load status via the protocol processing unit 406.
- the primary cell selection instruction receiving unit 423 can consider two primary cell selection methods.
- the terminal instructs the base station whether the cell is a primary cell.
- the schedule permission determining unit 421 permits scheduling to the terminal and operates the scheduler 414.
- Terminal 100 is Instructing base station 101 to be the primary cell and causing the base station to schedule can eliminate the signaling between the base station and the base station controller, and reduce the processing time by not interposing the base station controller.
- a candidate cell that can become a primary cell of a certain terminal is notified to the base station controller via the base station, and the primary cell is selected. This has the advantage that the primary cell signaling can be done together. Note that there are cases where the base station determines not only the primary cell but also the terminal. In this case, the instruction for the terminal power is the primary cell candidate, and the base power finally determines the primary cell.
- FIG. 6 is a block diagram showing a configuration of a mobile communication terminal apparatus that communicates with the base station shown in FIG.
- modulation section 300 multiplexes the signals of each channel, performs spreading processing using a predetermined spreading code, and further modulates it to a desired carrier wave.
- the power amplification unit 301 amplifies the signal output from the modulation unit 300 to a desired power.
- the signal amplified by the power amplifier 301 is transmitted to the base station via the antenna 302.
- the antenna 302 receives radio waves transmitted from the base station.
- the reception signal received by the antenna 302 is amplified to a level necessary for demodulation processing in the low noise amplification unit 303.
- Demodulation section 304 separates the received signal amplified by low noise amplification section 303 into the signal of the original channel even after despreading.
- the mobile communication terminal apparatus shown in FIG. 6 includes a control unit 305, a protocol processing unit 306, a DPCH transmission unit 307, a DPCH reception unit 308, and a CPI CH reception unit 309.
- the CPICH receiving unit 309 is a downlink radio link state estimating unit that estimates the downlink radio link state.
- the control unit 305 controls data transfer and timing.
- a protocol processing unit 306 processes a communication protocol.
- the DPC H transmission unit 307 and the DPCH reception unit 308 transmit and receive protocol signals.
- CPICH receiving section 309 receives the common pilot channel and passes the received common pilot channel level to protocol processing section 306.
- the protocol processing unit 306 notifies the base station control device of a candidate for a cell to be soft-noded over the dedicated channel based on the reception level of the common pilot channel transmitted to the CPICH receiving unit 309.
- the mobile communication terminal shown in FIG. With 310 the mobile communication terminal shown in FIG. With 310.
- the TPC command receiving unit 310 takes out the DPCCH including the control information from the DPCH receiving unit 308, and also obtains the TPC command. Then, according to the instruction of the TPC command, the transmission power amplification process performed by the power amplification section 301 is controlled.
- the TPC command instructs the base station power terminal to increase or decrease the transmission power of the terminal.
- the mobile communication terminal apparatus shown in FIG. 6 includes a transmission buffer 311, a scheduling request information creation unit 312, an E-DPC CH transmission unit 313, and scheduling reception. Unit 314, transmission permission control unit 315, E-DCH transmission unit 316, response signal reception unit 317, retransmission control unit 318, and CPICH reception level information transmission unit 320.
- User data is input from the control unit 305 to the transmission buffer 311.
- the scheduling request information creation unit 312 creates scheduling request information based on the user data input to the transmission buffer 311.
- the E-DPCCH transmission unit 313 encodes the scheduling request information created by the scheduling request information creation unit 312 into a transmittable form and outputs the encoded information to the modulation unit 300.
- modulation section 300 modulates the input data of various transmission physical channels (DPDCH, DPCCH, E-DPCCH) using a known technique, and outputs the modulated baseband signal to power amplification section 301.
- the power amplifying unit 301 converts the input transmission baseband signal into a radio frequency signal and transmits it to the base station via the antenna 302.
- the base station that receives the scheduling request information having the terminal capability performs scheduling.
- the mobile communication terminal apparatus shown in FIG. 6 has a scheduling reception unit 314, a transmission permission control unit 315, and an E-DCH transmission unit 316.
- the scheduling receiving unit 314 receives an instruction from the scheduler on the base station side, that is, a scheduling result.
- the transmission permission control unit 315 outputs transmission data from the transmission buffer 311 according to the scheduling result transmitted from the base station side received by the scheduling reception unit 314.
- the E-DCH transmission unit 316 encodes the transmission data output from the transmission buffer 311 into a form in which E-DCH can be transmitted, and outputs the encoded data to the modulation unit 300.
- the base station normally receives the transmission data transmitted from the terminal, it transmits an ACK signal to the terminal.
- the transmission data transmitted from the terminal When it cannot be received, a NACK signal is transmitted to the terminal.
- the terminal Based on the ACKZNACK signal transmitted from the base station, the terminal recognizes that the data transmitted from the terminal is reliably transmitted to the base station. When the terminal receives an ACK signal from the base station, the terminal selects new packet data to be transmitted next. When the terminal receives the NACK signal from the base station, the terminal follows the HARQ (hybrid ARQ) mode. Retransmission of transmitted data. Data retransmission processing according to the HARQ mode will be described later and will not be described in this embodiment. As a configuration for performing new data transmission or data retransmission according to the ACKZNACK signal transmitted from the base station, the mobile communication terminal apparatus shown in FIG.
- the ACK ZNACK signal transmitted from the base station is demodulated by the low noise amplifying unit 303 and the demodulating unit 304 and input to the response signal receiving unit 317.
- Response signal receiving section 317 recognizes the ACKZNACK signal included in the demodulated received signal and outputs the signal to retransmission control section 318.
- the retransmission control unit 318 selects the next new packet data when the signal transmitted from the base station is an ACK signal, and performs retransmission processing according to the HARQ mode when the signal is NACK.
- Hybrid ARQ Automatic Repeat reQuest
- FEC FEC
- This technology improves quality by combining with (Forward Error Correction), and has the advantage that error correction functions effectively by retransmission even for transmission paths with varying quality.
- further quality improvement can be obtained by combining the initial transmission reception result and the retransmission reception result upon retransmission.
- the base station can receive the signal transmitted from the terminal without any problem, but the terminal receives the response signal (ACK) transmitted from the base station. Cannot receive.
- ACK response signal
- Base station-powered terminals that are unable to receive ACK signals will reach the base station! Since retransmission processing is performed by judging that the system is too short, the throughput of the entire system deteriorates.
- the terminal retransmits data based on the NACK signal from the base station or communicates with excessive transmission power. Overall throughput is degraded.
- the primary cell When a primary cell is selected in a situation where link imbalance occurs, the following A problem occurs.
- the quality of the uplink transmission path is not good although the quality of the downlink transmission path between the base station and the terminal of the primary cell is good.
- the base station since the base station cannot receive the signal transmitted from the terminal, it determines that it is a reception error and transmits a NACK signal to the terminal.
- the terminal that received the NACK signal such as the base station, will retransmit the previously transmitted packet data up to a predetermined limit (time).
- a cell having good communication quality on the downlink transmission path but poor communication quality on the uplink transmission path is not suitable as a primary cell.
- the base station 101 when the primary cell is selected based on the communication quality of the uplink transmission path, as shown in FIG. 7, the base station 101 has good communication quality of the uplink transmission path and poor communication quality of the downlink transmission path. b is selected as the primary cell of terminal 100. In such a case, since the base station 101b can receive the signal transmitted from the terminal 100 without any problem, the base station 101b transmits an ACK signal to the terminal 100 as a response signal. However, since the communication quality of the downlink transmission path is poor, terminal 100 cannot properly receive the ACK signal from base station 101b, and determines that the previously transmitted data is not received by the base station. Then, the terminal 100 retransmits data to the base station 101b up to a predetermined limit number (time).
- the base station 101b having good communication quality on the uplink transmission channel but poor communication quality on the downlink transmission channel is not suitable as a primary cell. Rather, although the communication quality of the uplink transmission path is inferior to that of the base station 101b, the base station 101a having good downlink transmission path quality should be selected as the primary cell of the terminal 100.
- the quality of both the uplink and downlink transmission channels must be good, and a cell without link imbalance must be selected as the primary cell. desirable. For this purpose, cell selection that considers both uplink quality and downlink quality is necessary.
- FIG. 8 is a flowchart for explaining a primary cell selection process in consideration of vertical quality, which is executed by the base station according to Embodiment 1 of the present invention.
- the base station estimates the state of the uplink transmission path, for example, communication quality, by measuring SIR. Also, the base station receives the CPICH reception information notified from the terminal as status information, and determines the communication quality of the downlink transmission path based on this CPICH reception level. In this way, the base station selects the primary cell. System can select an appropriate primary cell according to the change in communication quality of the uplink transmission path. In addition, since the primary cell is selected based on the communication quality of the uplink transmission path and the downlink transmission path, it is possible to prevent the link imbalance from being selected as the primary cell, and the throughput of the entire system. Can be improved.
- the terminal receives a CPICH (Common-Pilot Channel) used by the base station to inform the terminal of the timing reference.
- the terminal receives not only the CPICH transmitted from the base station of the cell in the service area but also the plurality of base station powers CPICH of adjacent cells.
- the terminal compares the received levels of the received CPICH signals of multiple base stations, and can receive the ACKZNACK response signal without any problem. Identify the ground station.
- step ST702 the terminal notifies the received CPICH level as status information to the base station with good reception quality determined based on the received CPICH level.
- the terminal does not notify the received CPIC H level to the base station with a poor CPICH reception level.
- the base station can recognize the communication quality of the downlink transmission path.
- the terminal does not notify the CPICH reception level to a base station with a poor CPICH reception level! /, So the base station side of the downlink transmission path to the terminal that has notified the CPICH reception level Quality can be considered good.
- Step ST703 the terminal transmits DPCCH from DPCH transmission section 307.
- FIG. 31 is a diagram illustrating a format of a signal for notifying communication quality information of a downlink transmission path from the terminal to the base station.
- the signal format shown in FIG. 31 (a) includes an ACK / NACK unit 700 and a CQI (Channel Quality Indicator) unit 701. CQI for downlink packet communication does not need to distinguish cells.
- the uplink packet format shown in FIG. 31 (b) includes a base station identifier 702 in place of the ACKZNACK unit 700.
- the number of bits of the base station identifier 702 increases depending on the number of links, it may be possible to reduce the number of bits by allocating only the higher-quality ones of the SHO links.
- step ST704 the base station control apparatus determines the SI notified in the past from each base station! The R value is compared to determine a threshold used for primary cell selection, and the threshold is notified to each base station in step ST705. Note that the base station control apparatus may notify each base station of the Targe SIR value instead of the threshold value. If the base station has a better uplink transmission channel quality than the threshold notified from the base station controller, the terminal has a radio link only with the base station itself (one-to-one type). Select the primary cell. If the terminal is in the SHO state (one-to-many type), the scheduler is operated to allocate radio resources to the terminal.
- step ST706 DPCH receiving section 407 of the base station obtains the pilot strength from the DPCCH signal to which the terminal power is also transmitted.
- base station interference amount measuring section 408 measures interference.
- the SIR calculation section 409 of the base station calculates the SIR in step ST708. Based on the SIR calculated in this way, the base station can recognize the communication quality of the uplink transmission path.
- the base station scheduling permission determination unit 421 receives the CPICH reception level, which is state information notified from the terminal, and the SIR calculated in step ST708 is a predetermined scheduling permission condition, here a threshold value. It is judged whether it is over.
- the base station can determine that the communication quality of the downlink transmission path from the base station to the terminal is good if it also receives the CPICH signal and the terminal power if the SIR exceeds a predetermined threshold. It can be estimated that the communication quality of the uplink transmission path to the base station is good. In this way, the base station selects a primary cell based on the communication quality of the uplink transmission path and the downlink transmission path.
- step ST709 the base station determines that the communication quality is good for both the uplink transmission path and the downlink transmission path, permits scheduling, and performs scheduling as the primary cell of the terminal in step ST710. Process. Then, the scheduling result is notified to the terminal.
- the base station has a problem with the communication quality of the uplink transmission path, although the quality of the downlink transmission path to the terminal that has notified the CPICH reception level is good. Judge that link imbalance has occurred. In this case, the base station does not perform scheduling processing for the terminal. In other words, the base station itself determines that it is not suitable as the primary cell for the terminal.
- step ST712 the terminal performs scheduling notified from the base station. Based on the result, E-DCH transmission section 316 transmits E-DCH.
- the base station according to Embodiment 1 of the present invention described above recognizes that the communication quality of the downlink transmission path from the base station to the terminal is good when the CPICH reception level is notified from the terminal. To do.
- the base station determines whether the quality of the uplink transmission path from the terminal to the base station is good by comparing the pilot strength of the transmitted DPCCH signal and the SIR obtained from the interference with the threshold. If both the quality of the downlink transmission path and the quality of the uplink transmission path are good, a scheduling process for allocating radio resources to the terminal is performed.
- the base station itself determines whether link imbalance has occurred in the uplink and downlink transmission paths with the terminal, and determines whether it is appropriate as the primary cell of the terminal, so it is not necessary between the base station and the mobile station. Communication can be suppressed, and throughput can be improved.
- the base station controller determines whether the base station is suitable as the primary cell of the predetermined mobile station, for example, the process of notifying the base station controller of the communication quality of the uplink transmission path becomes unnecessary. Therefore, the time required for the primary cell selection process can be shortened, and it is possible to respond quickly to changes in the communication quality of the uplink transmission path. More specifically, AMC (Adaptive Modulation and Coding) can be appropriately executed according to the current transmission path quality by being able to respond quickly to changes in the transmission path, thereby reducing transmission errors. In addition, an effect of improving throughput can be expected.
- AMC Adaptive Modulation and Coding
- the base station described above has determined that the communication quality of the downlink transmission path is good based on the notification of the CPICH reception level measured by the terminal as the state information. If the quality of the uplink transmission path is estimated to be good based on the SIR, scheduling processing for that terminal was performed. However, the terminal does not simply notify the CPICH reception level as status information. The coefficient (selection penalty) for “thinning” the communication quality of the uplink transmission channel according to the CPICH reception level is notified to the base station as status information. A method is also conceivable. Thus, using FIG. 9, the processing of the base station that performs primary cell selection based on the “selection penalty” in which the terminal power is also notified will be described.
- the selection penalty is a penalty coefficient that is set to a CPICH reception level that is worse than the reference CPICH reception level. Conversely, a factor is set to a CPICH reception level that is better than the reference CPICH reception level. May be. In any case, relative to the reference CPICH reception level A coefficient is set for each, and any of them can be adopted. Note that sending a penalty is an example. Instead of sending a penalty value, the current quality is sent as status information (quality indicator), and the receiving side is configured to obtain a penalty based on it. However, the same effect can be obtained.
- FIG. 9 is a flowchart for explaining a modification of the primary cell selection process in consideration of vertical quality, which is executed by the base station according to Embodiment 1 of the present invention.
- step ST700, step ST701, and step ST703 shown in FIG. 8 are executed before executing step ST1100 in FIG.
- the base station has executed Step ST706 to Step ST708 shown in FIG. 8 before executing Step ST1101.
- the base station measures the communication quality of the uplink transmission path, determines the SIR obtained as the uplink radio link state estimation result, and the selection penalty notified from the terminal as the communication quality of the downlink transmission path.
- a primary cell is determined.
- the selection penalty means that the communication quality of the downlink transmission path is bad! If the communication quality of the downlink transmission path is not good so that the cell is not selected, the communication quality of the uplink transmission path is reduced. This is a kind of parameter for “thinning out” based on the communication quality of the transmission line and for virtually considering the quality as actually worse than the communication quality of the uplink transmission line.
- the terminal Based on the CPICH level measured by CPICH reception section 309, the terminal calculates a selection penalty value in primary cell selection section 319 in step ST1100 of FIG. Then, the selection penalty value calculated by primary cell selection section 319 is notified to the base station via E-DPCCH transmission section 313.
- the base station corrects the communication quality (SIR) of the uplink transmission path calculated by the SIR calculation section 409 using the selection penalty notified from the terminal.
- SIR communication quality
- step ST1102 the base station thresholds the uplink transmission channel quality (referred to as deemed uplink channel quality) corrected by the selection penalty notified from the terminal. Determine whether the value is exceeded. If the deemed uplink channel quality is equal to or higher than the threshold value, step
- step ST1103 scheduling processing is performed. Then, in step ST1104, the scheduling result is notified to the terminal.
- the "selection penalty" in the above description is a correction coefficient or a correction threshold reflecting the quality of the channel in the reverse direction when the primary cell is selected.
- FIG. 10 is a flowchart for explaining the selection penalty determination process.
- the selection penalty determination process shown in FIG. 10 is executed by the terminal in step ST1100 of FIG.
- step ST1500 terminal 100 receives CPICHs from a plurality of base stations and measures the reception level of each CPICH.
- terminal 100 identifies a cell with the best CPICH reception level based on the measured reception levels of a plurality of CPICHs, and sets the CPICH reception level of this cell to “1” (100%). Then, in step ST1502, terminal 100 identifies a cell having a reception level sufficient to receive ACK / NACK but having the least CPICH reception level among a plurality of measured CPICH reception levels. The CPICH reception level from is set to “0” (0%). Through the above processing, terminal 100 has recognized the cell with the highest CPICH reception level and the cell with the lowest CPICH reception level among the cells that can receive ACK / NACK.
- terminal 100 sets a coefficient between 0% and 100% for the CPICH reception level of each cell based on the CPICH reception level set to “1” and the CPICH reception level set to “0”. .
- the terminal 100 notifies the penalty coefficient set as described above to each base station 101 that has measured the CPICH reception level.
- FIG. 11 is a diagram showing the format of a signal for notifying the base station of the selected penalty coefficient set by performing the processing as shown in FIG.
- the signal shown in FIG. 11 includes a base station identifier 600 and a coefficient 601.
- Base station identifier 600 is an identifier for identifying a base station that is a notification destination of a selected penalty coefficient.
- the base station identifier 600 can be omitted from the signals shown in FIG.
- Selection penalty factor 601 is the actual communication product Send a rate that is lower than quality and considered value.
- the coefficient value may be indicated by a true value or a logarithmic value.
- FIG. 12 is an explanatory diagram showing a comparative example when a primary cell is selected without using a selection penalty coefficient in a certain base station and when a primary cell is selected using a selection penalty coefficient.
- the communication quality of the uplink transmission line is better for terminal 1 than that of terminal 2
- the communication quality of the downlink transmission line is better for terminal 2 than for terminal 1.
- terminal 1 notifies the base station of a selection penalty coefficient of 50% and terminal 2 based on the communication quality of the downlink transmission path.
- FIG. 12 (a) illustrates a case where a primary cell is selected using communication quality A and B (both uplink SIR values) of uplink transmission paths of terminal 1 and terminal 2 measured by a certain base station.
- FIG. 12 (b) shows the uplink transmission quality of terminal 1 and terminal 2 measured by a base station using the selected penalty coefficients (coefficients 50% and 100%) notified from terminals 1 and 2.
- the case where the primary cell is selected using “deemed uplink quality” C and D corrected by the bow I will be explained.
- the base station may be the primary sensor of any terminal! /, .
- FIG. 12 (b) uses the assumed uplink quality C and D obtained by correcting the communication qualities A and B of the uplink transmission paths of terminal 1 and terminal 2 respectively measured by a certain base station by the selected penalty coefficient.
- the base station described above determines the uplink transmission channel quality by correcting the uplink transmission channel quality using the selection penalty coefficient reflecting the downlink transmission channel quality, and selects the primary cell. Therefore, it is possible to prevent a decrease in throughput due to downlink ACK / NACK errors.
- the terminal notifies the base station of a selection penalty corresponding to the communication quality of the downlink transmission path, and the base station corrects the communication quality of the uplink transmission path according to this selection penalty. By doing so, even if the communication quality of the uplink transmission line is good, the communication product of the downlink transmission line I tried not to schedule poor quality devices. However, the terminal does not notify the base station of the selection penalty corresponding to the communication quality of the downlink transmission path, and the base station adjusts the threshold used for primary cell selection, that is, the scheduling permission condition, according to the communication quality of the downlink transmission path. You may make it do. Therefore, a primary cell selection process for adjusting the threshold on the base station side according to the communication quality of the downlink transmission path will be described using FIG.
- the base station control apparatus sets a threshold used for the primary cell selection process based on, for example, path loss information, and notifies each base station.
- the terminal measures the downlink CPICH reception level. If the downlink CPICH reception level is low! (That is, the probability of an ACK / NACK error is high!),
- the terminal sets the threshold used for primary cell selection via the E-DPCCH transmission unit 313. The control command to be raised is notified to the base station as status information. Terminal power
- the terminal determines whether the base station performing scheduling has a certain power by monitoring whether the scheduling information receiving unit 314 is notified of the scheduling result from the base station.
- the base station As a method of determining the presence / absence of a base station that performs scheduling, a method of determining by notification from a scheduler and a method of determining by the terminal itself are conceivable.
- the base station In the method of judging based on the notification from the scheduler, the base station notifies the terminal as scheduling information as scheduling information when the SIR level exceeds the threshold. On the other hand, if the SIR level does not exceed the threshold, the terminal is notified that it is not subject to scheduling.
- the terminal In the terminal's own determination method, the terminal considers a base station that receives scheduling information within a certain period as a scheduling target, and if scheduling information does not arrive within a certain period, the base station is excluded from scheduling. It is considered to be.
- step ST1204 the terminal notifies the base station of a command for lowering the threshold used for primary cell selection via the E-DPCCH transmission unit 313 as state information. .
- a method of notifying the base station of the threshold control command a method of transmitting the threshold value as a value and a method of transmitting a control command instructing to raise or lower the threshold value can be considered.
- FIG. 14 is a diagram showing a format of a signal for notifying the base station of the threshold value.
- Fig. 14 (a) shows the signal format used when notifying the base station of the threshold value
- Fig. 14 (a) shows the signal format used when notifying the base station of the threshold value
- FIG. 14 (b) shows the signal format used when notifying the base station of a command specifying the increase or decrease of the threshold. is there.
- a base station identifier 800 when transmitting a threshold value to a base station, a base station identifier 800, a threshold value 801, and CRC802 for detecting an error are added.
- the base station identifier 800 can be omitted if the channel receives only a specific base station. It is not mandatory to include CRC802 in the signal format.
- the threshold value changes greatly, so it is necessary not to change the threshold value when an error occurs.
- the advantage of notifying the threshold directly to the base station is that the threshold can be changed quickly on the base station side.
- signaling to communicate increases.
- UL-E-DP CCH204 is used to transmit control information to the base station.
- the signal format shown in FIG. 14 (b) includes a base station identifier 800 and a threshold up / down command 804.
- the threshold up / down command 804 is used to increase the threshold and specify Z-lowering, so only one bit of information is required. However, multiple bits can be used, and the presence of multiple bits can increase the step width. It is also possible to prevent errors by expressing a command redundantly over multiple bits.
- the power to use UL-E-DPC CH204 to transmit control information to the base station DPCCH is a small number of signaling bits. It is also possible to use the feedback bit (FBI) present in
- FIG. 15 is a block diagram showing the configuration of the terminal according to Embodiment 2 of the present invention.
- a primary cell selection unit 319 receives uplink radio link status information and selects a base station that satisfies a scheduling permission condition in which the downlink radio link communication quality is set in advance.
- the DPCH receiving unit 308 is an uplink radio link state information receiving unit that receives state information indicating the state of the uplink radio link measured at the base station, for example, an SIR value.
- FIG. 15 the same reference numerals as those in FIG. FIG. 16 is a block diagram showing the configuration of a base station that communicates with the mobile communication terminal apparatus shown in FIG.
- the base station shown in FIG. 16 has a configuration necessary for primary cell selection from the base station shown in FIG. 3, which includes a load amount notification unit 420, a schedule permission determination unit 421, a CPICH level information reception unit 422, and a primary cell selection instruction reception. Unit 423 and threshold receiving unit 424 are excluded.
- the other reference numerals shown in FIG. 16 are the same as or equivalent to the reference numerals shown in FIG.
- FIG. 17 is a flowchart showing primary cell selection processing of the mobile communication terminal apparatus according to Embodiment 2 of the present invention.
- the base station measures the communication quality of the uplink transmission path from the terminal to the base station, and notifies the terminal of the measured communication quality of the uplink transmission path as status information.
- the SIR value of the uplink dedicated channel is used as the communication quality of this uplink transmission path.
- the terminal receives CPICH from the base station by CPICH receiving section 309. By measuring the CPICH reception level, the terminal can recognize the communication quality of the downlink transmission path.
- Step ST802 the terminal selects a primary cell based on the communication quality of the uplink transmission channel notified from the base station and the communication quality of the downlink transmission channel measured by receiving CPICH. Specifically, a search is made for a cell having good communication quality on the uplink transmission line and a sufficiently good CPICH reception level to receive a response signal. The terminal notifies the base station of a cell having good communication quality for both the uplink transmission path and the downlink transmission path determined in this way. For example, UL-E-DPCCH204 is used for notification of cells with good communication quality on both the uplink and downlink transmission paths.
- the uplink scheduler 414 of the base station performs a scheduling process of allocating radio resources to the terminal.
- the base station signals scheduling information to the terminal. For example, DL-E-DPCCH205 is used for notification of the scheduling information.
- the terminal that has received the scheduling information transmits E-DCH via E-DCH transmission section 316.
- the mobile communication terminal apparatus confirms that the communication quality of the uplink transmission path is good when the communication quality of the uplink transmission path is notified from the base station. Recognize that the communication quality of the downlink transmission line is good by measuring the CPICH reception level. Then, since the uplink transmission path communication quality is good and the downlink transmission path communication quality has a strength required for receiving the ACKZNACK response signal, a scheduling request is made, and link imbalance occurs in the uplink and downlink transmission paths. It is possible to prevent the problem of using a base station as a primary cell. Therefore, since the signal transmission between the base station and the mobile station is performed smoothly, so-called throughput can be improved. In addition, since the terminal itself selects the primary cell based on the quality of the downlink transmission path from the base station, the latest communication quality of the downlink transmission path is reflected.
- the terminal described above determines whether the communication quality of the uplink transmission path is good or not based on the communication quality of the uplink transmission path notified of the base station power.
- the state information notified from the base station to the terminal may employ a selection penalty coefficient that reflects the communication quality of the uplink transmission line rather than the communication quality of the uplink transmission line itself. Accordingly, the processing of the terminal that performs primary cell selection based on the “selection penalty” notified from the base station will be described with reference to FIG.
- the selection penalty here is to correct the communication quality of the downlink transmission path according to the communication quality of the uplink transmission path so that a cell with poor communication quality of the uplink transmission path is not selected as the primary cell.
- FIG. 18 shows the vertical quality performed by the mobile communication terminal apparatus according to Embodiment 2 of the present invention.
- 10 is a flowchart for explaining a modification of the primary cell selection process in consideration of the above.
- the base station uses the scheduling information signaling unit 415 to improve the quality! Signal the penalty coefficient to the terminal. This can be DL-E-DPC CH or other channels. Since the penalty coefficient notified of the base station power reflects the communication quality of the uplink transmission line, the terminal can recognize the communication quality of the uplink transmission line from this penalty coefficient.
- Step ST1301 the terminal receives the CPICH transmitted from the base station. The terminal can recognize the communication quality of the downlink transmission path from the received CPICH reception level.
- step 1302 the terminal applies a penalty coefficient to the CPICH reception level indicating the communication quality of the downlink transmission channel, estimates the communication quality of the downlink transmission channel to be worse than the actual communication quality, and then performs primary estimation. Select a cell. Then, the terminal notifies the base station of the primary cell selected as described above in step ST1303 using! / And E-DPCCH.
- FIG. 19 is a flowchart for explaining selection penalty coefficient determination processing by the base station.
- the base station uses the SIR calculation section 409 to obtain the current SIR value. The larger the SIR value, the better the quality.
- SIR calculating section 409 obtains the difference between the current SIR value and TargetSIR. TargetSIR value means the SIR level necessary to ensure the desired quality.
- SIR calculation section 409 determines whether the measured SIR level satisfies the communication quality specified by TargetSIR (the current SIR is a value equal to or higher than TargetSIR).
- Step ST1603 [Confirm!] Until SIR calculation 409409, determine a coefficient proportional to the difference between the current SIR value and TargetSIR. The larger the difference between the current SIR value and Target SI R, the worse the communication quality of the uplink transmission path. In other words, the selection penalty coefficient value increases.
- the scheduling information signaling section 415 uses the selected penalty coefficient determined by the above processing as the state information, as the terminal information. Send to.
- FIG. 20 is a diagram showing a format of a signal for transmitting a selection penalty coefficient and a threshold up / down command to the terminal.
- Fig. 20 (a) shows the signal format for notifying the terminal of the selection penalty coefficient on the common channel
- Fig. 20 (b) shows the signal format for notifying the terminal of the threshold up / down command on the common channel
- Fig. 20 (c) shows the selection.
- Fig. 20 (d) shows the signal format for reporting the threshold up / down command to the terminal on the dedicated channel.
- Figs. 20 (a) shows the signal format for notifying the terminal of the selection penalty coefficient on the common channel
- Fig. 20 (b) shows the signal format for notifying the terminal of the threshold up / down command on the common channel
- Fig. 20 (c) shows the selection.
- Fig. 20 (d) shows the signal format for reporting
- the terminal identifier 900 in the signal format. Note that a new dedicated identifier may be defined as the terminal identifier 900.
- RNTI Radio Network Temporary Identity
- d-RNTI Drift RNC / BSS RNTI
- c-RNTI Cell RNTI
- UTRAN Universal Terrestrial Radio Access Network
- GERAN GSM EDGE Radio Access Network
- DSCH Downlink Shared Channel
- DSCH-RNTI Downlink Shared Channel
- HS-DSCH High Speed Downlink Shared Channel
- 6 types of existing terminal identifiers can be used.
- CRC bit 902 when notifying the selection penalty coefficient, it is desirable to attach CRC bit 902 so that an error can be detected.
- a signal format shown in FIG. 20 (b) for notifying a threshold up / down command using a common channel will be described.
- at least one bit of information is sufficient. Therefore, a threshold up / down command 904 is added to the terminal identifier 900.
- redundancy can be increased and reception errors can be reduced.
- the signal format for notifying the selected penalty coefficient using the dedicated channel shown in Fig. 20 (c) will be described.
- the terminal identifier is not required, and the selection penalty coefficient (value) 901 may be included in the signal format.
- the terminal identifier is not necessary, and the threshold up / down command 904 may be included.
- the terminal will UL ED the selected primary cell Notify the base station via the PCCH204 channel.
- this channel is used as an individual channel, it is only necessary to transmit 1-bit information that is selected / not selected as a bramatic cell.
- the base station identifier Cell Identifier is attached for transmission. Actually, it is easy to make an error with 1 bit only!
- the base station When the base station recognizes that it has been selected as the primary cell by notification from the terminal, it performs scheduling and assigns radio resources to the terminal in step ST1304, and notifies the terminal of scheduling information in step ST1305.
- the terminal transmits packet data using the E-D CH based on the scheduling information notified from the base station.
- the terminal described above recognizes the communication quality of the uplink transmission path from the selection penalty notified of the base station power, recognizes the communication quality of the downlink transmission path from the CPICH reception level, and sets the CPICH reception level to the selection penalty. Based on this, it is possible to select the primary cell in consideration of the occurrence of link imbalance by estimating that the communication quality is worse than the actual one. A similar function can also be realized by estimating that the communication quality is better than the actual CPICH reception level at the terminal by using offset (Cell Individual Offset) instead of penalty.
- offset Cell Individual Offset
- the terminal described above estimates the communication quality of the downlink transmission path worse than the actual one using the selection penalty coefficient reflecting the communication quality of the uplink transmission path notified from the base station, and selects the primary cell. It was. However, instead of measuring the communication quality of the uplink transmission line at the base station and signaling the corresponding penalty coefficient to the terminal, the terminal itself decides the uplink transmission line based on the TPC command transmitted by each base station. The communication quality may be estimated and the primary cell may be selected. As an advantage of this method, it is not necessary to add signaling for notifying the uplink quality, and since the terminal can select a cell, the hardware of the base station can be simplified.
- the TPC command is placed on a dedicated channel and exists separately for the base station (Node-B) and the terminal, and does not require a terminal identifier.
- the TPC command is a command that reflects the difference between the current SIR value and TargetSIR value. In other words, by diverting the TPC command, implicit signaling (a type of signal that infers similar information indirectly without direct signaling transmission). Ring) can be realized.
- FIG. 21 is a flowchart for explaining a modification of the primary cell selection process in consideration of vertical quality, which is executed by the mobile communication terminal apparatus according to Embodiment 2 of the present invention.
- the base station sets the TPC for controlling the transmission power of the mobile station according to the uplink communication quality and notifies the mobile station.
- the mobile station can use this TPC as a kind of status information that reflects the communication quality of the uplink transmission path.
- Step ST1400 the base station transmits a TPC command to the terminal.
- the terminal performs averaging or reliability check at TPC command receiving section 310, eliminates the influence of TPC reception error, and recognizes the TPC command for which the base station power is also notified.
- Step ST1402 the terminal estimates the communication quality of the uplink transmission path based on the transmission power control instruction instructing to increase or decrease the transmission power of the terminal included in the TPC command. For example, if the transmission power control instruction of the TPC command indicates "transmission power increase", the communication quality of the uplink transmission path is not good, but conversely if "transmission power reduction” is instructed, uplink transmission It can be estimated that the communication quality of the road is good.
- the first method to avoid TPC command errors is to exclude TPCs with low reliability.
- reliability the signal-to-interference ratio (SIR) is obtained from the CPICH reception level or the individual pilots in the D PCCH. If the SIR value is low, the TPC command from the base station is regarded as untrustworthy and is excluded.
- SIR signal-to-interference ratio
- a second method to avoid TPC command errors is to perform averaging (processing on the mobile station side).
- Averaging can be regarded as a kind of filter, and TPC errors can be removed by performing such filtering.
- Averaging can prevent the effects of errors, but if the average time is long, there is a problem in that there is a time delay before results are obtained.
- a method of varying the average time according to the reliability can be considered. In other words, when reliability is high, shorten the averaging time. If the reliability is high, the averaging time is increased.
- step ST1400 the TPC command received by the mobile station from the base station is the power offset by the base station instructed to add the base station controller power E—DCH. Is increased.
- the power offset P03 of the DPCCH pilot in addition to P02 is also increased to prevent being excluded by the reliability check. Can do.
- the third method increases the TPC transmission power itself and can be expected to be effective.
- this base station with increased power is applied only to base stations with good upstream quality (base stations that issue instructions to reduce power at the TPC).
- the information necessary for the terminal is a base station with good communication quality of the uplink transmission path, and the TPC of the base station with low reliability is excluded in combination with the first method, so that the communication quality of the uplink transmission path is poor. Since there is no possibility that the base station mistakes if the communication quality of the uplink transmission line is good, the power of the base station having poor communication quality of the uplink transmission line does not need to be increased. Therefore, the transmission power of the base station can be saved.
- TFCI hard spirit mode is a W-CDMA system.
- the base station power also exists only in the downlink direction to the terminal.
- the TFCI bits are divided into front and rear, and these divided TFCI bits are transmitted as two types of TFCI.
- the same signal can be placed on TFCI in addition to TPC, and the effect of errors can be reduced compared to the case of TPC alone.
- the third method is also used, in order to improve the quality of TFCI itself, it is desirable to increase the power offset POl of TFCI! /.
- Step 1403 of Fig. 21 the terminal receives the CPICH transmitted from the base station. By measuring the reception level of the CPICH received here, the terminal can recognize the communication quality of the downlink transmission path.
- step 1404 the terminal has a good communication quality of the uplink transmission path for which the TPC command power is also estimated, and the communication quality of the downlink transmission path for which the CPICH reception level power is also recognized. Search and select this as the primary cell.
- step ST1405—step ST1408 are the same as those already described, and thus the description thereof is omitted.
- the terminal determines the primary cell in consideration of the communication quality of the uplink transmission path and the communication quality of the downlink transmission path, and the packet data is transmitted according to the scheduling information from the base station determined as the primary cell.
- the terminal that performs transmission has been described.
- the terminal described below is suitable for ensuring the optimal transmission quality of the uplink transmission line regardless of the occurrence of link imbalance in which the communication quality of the uplink transmission line and the communication quality of the downlink transmission line are imbalanced.
- Hybrid Automatic Repeat reQuest is selected to improve throughput.
- HARQ is ARQ and FEC (Forward It is a technology that improves the communication quality of the uplink transmission line by combining with Error Correction), and there is an advantage in that error correction functions effectively by retransmission even for a transmission line whose communication quality changes. In particular, further quality improvement can be obtained by combining the initial transmission reception result and the retransmission reception result upon retransmission.
- An example of the HARQ method is “Chase Combining IV”. Chase Combining transmits the same data sequence for initial transmission and retransmission, but improves the gain by combining the initial transmission data sequence and the retransmission data sequence during retransmission. Even if there is an error in the initial transmission data, it is partially accurate, and it is more accurate by combining the initial transmission data and the retransmission data. Based on the idea that data can be sent to
- IR Intelligent Redundancy
- IR is to increase redundancy, and to transmit redundancy bits in retransmission to increase redundancy by combining with initial transmission, and to improve quality by using an error correction function. If there are a lot of errors, resending is more redundant and the correction capability is improved. Therefore, there are aspects where using IR is more effective than using Chase Combining. However, when using IR, it is necessary to synchronize the HARQ state between cells. When cells are far away, it is difficult to contact the schedulers and know the current HARQ status.
- a certain base station 101a cannot receive a transmission signal from the terminal 100 and does not receive a NACK. Then, another base station 101b may receive a transmission signal from the terminal 100 and return an ACK. In such a case, the scheduler of the base station 101a has the ability to wait for retransmission from the terminal 100. The base station 101b waits for transmission of the next packet data from the terminal 100.
- the base station controller 102 In order to synchronize the base station 101a with 10 lb, the base station controller 102 must intervene, so time is required for signal exchange via the base station controller 102 and processing in the base station controller 102. Will result in a decrease in overall system throughput. The title arises.
- FIG. 22 is an explanatory diagram for explaining the characteristics of Chase Combining and IR.
- the vertical axis represents transmission efficiency and the horizontal axis represents transmission line quality.
- the vertical axis shows that the transmission efficiency improves as the distance from the origin increases, and the horizontal axis shows that the error rate increases as the distance from the origin increases, that is, the transmission line quality deteriorates.
- IR adds a larger number of information bits to the initial transmission than Case Combining, enabling high-speed transmission.
- resending is necessary (Section B)
- Chase Combining is more efficient.
- FIG. 23 is an explanatory diagram illustrating a state in which the terminal is in the SHO state in which the terminal communicates with a plurality of base stations and is performing macro selection / combination.
- the base station control apparatus 102 selects the base station 101b.
- FIG. 24 is a block diagram showing the configuration of the mobile communication terminal apparatus according to Embodiment 3 of the present invention.
- the mobile communication terminal apparatus described below needs to have a function for instructing retransmission by switching the HA RQ mode based on the selection result of the primary cell. Therefore, a HARQ switching unit 321 is provided.
- HARQ switching section 321 instructs retransmission control section 318 to switch the HARQ scheme according to the result of primary cell selection section 319.
- the same reference numerals as those in FIG. 15 denote the same or corresponding parts, and the description thereof is omitted.
- FIG. 25 is an explanatory diagram showing the situation of case 1.
- FIG. FIG. 25 shows that the terminal 100 is in the SHO state in which the terminal 100 communicates with the base station 101a via the link 1, the base station 101b with the link 2, and the base station 101c with the link 3.
- link 1 and link 2 have good uplink transmission channel communication quality, but the downlink transmission channel communication quality is poor, and link 3 has good uplink and downlink transmission channel communication quality. Show. In Fig.
- link 1 and link 2 have an imbalance between the communication quality of the upstream transmission path and the communication quality of the downstream transmission path. There is no balance.
- the terminal 100 adopts IR instead of the macro selection combining as the HARQ method, and communicates only with the base station 101c via the link 3 having the best communication quality S.
- IR is the transmission efficiency when the transmission line quality is good enough to send data almost certainly at the first transmission. This is because the HARQ state synchronization between cells, which is a high IR and a weak point of IR, is not a problem if the number of communicating base stations is limited to one. If it is possible to communicate with the target base station reliably by using IR, it will not be a problem that macro selection synthesis cannot be used.
- terminal 100 recognizes the communication quality of the uplink transmission path and the communication quality of the downlink transmission path with a plurality of base stations in order to select the primary cell. Therefore, when performing the process of step ST802, terminal 100 can recognize a base station with a good communication quality that protrudes from the plurality of cells, and selects this base station as a primary cell. In step ST803, the base station is notified that it has been selected as the primary cell and that the IR is used as the HARQ scheme. Then, the HARQ switching unit 321 shown in FIG. 24 is set to communicate using IR. When the base station power scheduling information selected as the primary cell is received, in step ST806, terminal 100 transmits packet data using IR.
- FIG. 26 shows the format of a signal transmitted by the terminal to notify the base station selected as the primary cell and the HARQ scheme used for data transmission.
- NDI New Data Indicator 600 is an identifier for making the base station recognize whether the transmission data is the initial transmission power or retransmission.
- the Chase / IR identifier 601 is an identifier for allowing the base station to recognize the HA RQ mode used for data transmission.
- Base station number 602 is an identifier for recognizing which base station communicates when IR is selected as the HARQ mode.
- Redundancy version 603 identifies information bits / parity bits in IR. In Case 1, it is assumed that the number of retransmissions is small, so the number of bits in the redundancy version can be reduced. For example, if the number of transmissions is 2 times, there should be 1 bit to distinguish the first and second times.
- the terminal uses the IR to transmit data to the base station for a base station whose communication quality on the transmission line is good enough to transmit data almost certainly by the initial transmission. By transmitting data, information bits can be transmitted efficiently. In particular, it has a remarkable effect when communicating at a high rate on the upstream transmission path.
- the HARQ scheme selection process executed by the terminal when the communication quality of the transmission path with each cell among the plurality of cells is not good in Case 2 will be described.
- FIG. 27 is an explanatory diagram showing the situation of Case 2.
- FIG. 27 is an explanatory diagram showing the situation of Case 2.
- FIG. 27 shows that the terminal 100 is in the SHO state in which the terminal 100 communicates with the base station 101a via the link 1, the base station 101b via the link 2, and the base station 101c via the link 3.
- link 1 and link 3 have poor upstream communication quality, but the downstream transmission quality is good, and link 2 has good upstream communication quality. Indicates poor communication quality.
- Figure 27 shows that link 1 and link 3 have a link imbalance between the upstream transmission path and the downstream transmission path. The case where communication quality is bad is shown. Thus, Chase Combining that lacks redundancy is inappropriate when the communication quality of link 1 and link 3 is poor overall. In addition, when the communication quality of all links is poor, macro selection / combination is not effective.
- the terminal transmits data using Chase Combining and receives a NACK
- the terminal estimates that the communication quality of the downlink transmission line is poor and the communication quality of the downlink transmission line is good. it can.
- Chase Combining power that lacks redundancy may be successfully transmitted to the base station by switching the HARQ system to IR.
- the terminal or the base station controller determines that the macro selection / combination is not effective and switches to IR. Based on response signals transmitted from a plurality of base stations, the terminal can determine whether the macro selection / combination is functioning. For example, when a NACK is received from a base station, it can be determined that the base station has received an error but has an error correction capability and an error has occurred. In addition, the fact that NACK was received indicates that the communication quality of the downlink transmission path is good. On the other hand, if the response signal with the power of the base station cannot be received, the cause is that the communication quality of the uplink transmission path is extremely poor, and the transmission signal from the terminal arrives at the base station.
- FIG. 28 is a flowchart for explaining a process in which the terminal switches the HARQ scheme to the macro selection / combining power IR.
- the terminal shown in FIG. 15 receives a response signal (ACKZNACK) notified from a plurality of receivable base stations using response signal receiving section 317.
- the terminal determines whether macro selection combining is functioning in primary cell selection section 319.
- Primary cell selection section 319 determines that macro selection combining is not functioning when there is no base station that has notified ACK as a response signal, for example, and executes the process of step ST1002. If there is a base station that has notified ACK as a response signal, the macro selection / combination is functioning. Therefore, it is not necessary to switch the HARQ system to IR, and the process is terminated.
- step ST1002 which is executed when there is no base station that has notified ACK as a response signal, primary cell selection section 319 of the terminal uses one of the base stations that have notified NACK as a response signal as a primary cell. select.
- the base station reporting NACK has poor communication quality on the uplink transmission path, it has communication quality that some signal can reach the base station, and the communication quality of the downlink transmission path can receive at least NACK. It can be estimated to be good to some extent. Therefore, in step ST1003, the terminal decides to use IR as the HARQ method in order to increase the redundancy of the transmission signal and succeed in uplink communication, and notifies the base station. Then, the terminal transmits E-DCH to the base station using IR.
- the redundancy version indicates what kind of norit is included when the initial transmission and retransmission are different or when the retransmission includes different parity (version).
- FIG. 29 shows a signal format in which the base station also notifies the base station that it uses the IR mode in the case 2 situation.
- redundancy version 603 is assumed to generate many retransmissions in case 2, and therefore, the redundancy version has a large number of norities. Note that the same reference numerals as those in FIG. Since one or an equivalent part is shown, explanation is omitted. For example, 2 bits are needed to consider up to 4 transmissions, and 3 bits are needed to consider up to 8 transmissions.
- the base station control device makes a decision to switch to IR after grasping the effect of macro selection combining! /
- the base station control device is notified from each base station.
- the reception results (CRC results of each cell force) are compared, and it is determined whether the macro selection / combination functions. If it is determined that the macro selection / combination is not functioning, the base station that transmitted the NACK is selected from the plurality of base stations, and it is determined to use the IR as the HARQ scheme. Then, the terminal is notified of the base station selected as the primary cell and the HARQ scheme to be used (in this case IR).
- the base station controller decides to switch to IR based on the CRC result of each base station, it instructs the terminal to use IR by RRC signaling.
- Case 2 of Embodiment 3 is characterized in that error correction is performed by increasing the redundancy by IR when the quality is not good.
- Chase Combining is effective when redundancy is insufficient.
- the base station and the terminal consider the communication quality of the uplink transmission path and the communication quality of the downlink transmission path, respectively, in order to prevent a decrease in throughput due to link imbalance.
- the primary cell was selected.
- the communication quality of the uplink transmission path is good.
- a base station that selects a primary cell according to the communication quality of the uplink transmission path will be described.
- the base station that can measure the quality of the uplink signal selects the cell, so that it can follow changes in the high-speed uplink transmission path.
- FIG. 30 is a flowchart showing the processing of the base station that selects the primary cell based on the communication quality of the uplink transmission path.
- the base station controller compares the past SIR values notified from each base station, and sets a threshold value as a reference for selecting a primary cell. decide. In this case, scheduling should be performed from at least one base station.
- the base station control apparatus notifies each base station of the threshold for primary cell selection.
- the base station that has received the notified threshold value stores the threshold value in the threshold value reception unit 421. If the communication quality of the uplink transmission path from the terminal to the base station is better than this threshold, primary cell selection processing (one-to-one type) and scheduling (one-to-many type) are performed.
- step ST102 the terminal transmits D PCCH to the base station using DPCH transmission section 307.
- the base station that has received the DPCCH transmitted from the terminal also measures the pilot strength of the received DPCCH power in step ST103.
- step ST104 the base station measures interference by interference amount measuring section 419, and calculates SIR by SIR calculating section 409 in step ST105.
- This SIR is used as a parameter indicating the communication quality of the uplink transmission path from the terminal to the base station.
- step ST106 the base station uses the schedule permission determining unit 421 to determine whether the communication quality of the uplink transmission path exceeds a predetermined level based on the SIR and the threshold value.
- step ST106 for example, when the communication quality of the uplink transmission path indicated by SIR exceeds the threshold value, the base station performs scheduling in step ST107, and notifies the scheduling information to the terminal in step 108.
- step ST109 the terminal that has received the scheduling information of the base station power transmits E-DCH to the base station via the E-DCH transmission unit based on the scheduling result.
- the shortcoming of this method is that the condition of the transmission line changes every moment, so the number of base stations to be finally scheduled is not strong. Therefore, signaling that raises and lowers the threshold is prepared and the terminal power is also instructed. The signaling may be notified directly to the base station, or may be notified to the base station control device by signaling called RRC.
- the terminal changes the threshold value in primary cell selection section 319 if necessary.
- the changed threshold value may be notified directly to the base station from the E-DPCCH transmission unit 307, or may be notified from the DPCH transmission unit 305 to the base station controller as RRC signaling.
- RRC signaling does not work as a threshold signaling method, it takes time because it is notified to the base station via the base station controller. Therefore, in order to change the threshold to the base station at a higher speed, it is instructed to raise or lower the threshold by physical layer sidedling. Things are desirable.
- the terminal can reduce the number of cells to be unnecessarily scheduled by increasing the threshold, and can increase the number of cells to be scheduled by decreasing the threshold.
- the present invention can be used for a mobile phone terminal and a base station that support uplink packet communication.
Abstract
Description
Claims
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EP04771281A EP1775977A4 (en) | 2004-08-05 | 2004-08-05 | BASE STATION, MOBILE COMMUNICATION TERMINAL APPARATUS, AND PRIMARY CELL SELECTION METHOD |
CNA200480043754XA CN1998258A (zh) | 2004-08-05 | 2004-08-05 | 基站和移动通信终端装置以及主小区选择方法 |
PCT/JP2004/011254 WO2006013630A1 (ja) | 2004-08-05 | 2004-08-05 | 基地局、移動通信端末装置およびプライマリセル選択方法 |
JP2006531065A JP4527119B2 (ja) | 2004-08-05 | 2004-08-05 | 基地局、移動通信端末装置およびプライマリセル選択方法 |
US12/976,749 US20110090859A1 (en) | 2004-08-05 | 2010-12-22 | Base station, mobile communication terminal equipment, and primary cell determination method |
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JP2010171915A (ja) * | 2008-12-25 | 2010-08-05 | Kyocera Corp | 無線基地局、無線リソース割り当て方法および無線通信システム |
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CN102006627B (zh) * | 2010-11-01 | 2013-04-17 | 中国电信股份有限公司 | Wlan切换方法和系统 |
Also Published As
Publication number | Publication date |
---|---|
EP1775977A1 (en) | 2007-04-18 |
US20090016278A1 (en) | 2009-01-15 |
CN1998258A (zh) | 2007-07-11 |
JPWO2006013630A1 (ja) | 2008-05-01 |
US20110090859A1 (en) | 2011-04-21 |
JP4527119B2 (ja) | 2010-08-18 |
EP1775977A4 (en) | 2011-04-06 |
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