WO2006051578A1

WO2006051578A1 - Communication control method, wireless base station control apparatus, wireless base station and wireless terminal

Info

Publication number: WO2006051578A1
Application number: PCT/JP2004/016570
Authority: WO
Inventors: Masaya Akihara
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2004-11-09
Filing date: 2004-11-09
Publication date: 2006-05-18

Abstract

In a case where a wireless terminal enters the cells of a plurality of wireless base stations and these wireless base stations are placed into a situation that must control the upstream transmission rates of wireless sections for the wireless terminal (determine whether to change transmission rates), when the wireless terminal sends a request of changing the upstream transmission rates, there may occur a difference in determining whether to change the transmission rates between the wireless base stations. According to the present invention, a wireless base station control apparatus selects, as a rate control wireless base station, one of a plurality of wireless base stations by use of a predetermined procedure.

Description

Specification

Communication control method, radio base station control apparatus, radio base station, and radio terminal

The present invention relates to a communication control method, a radio base station control device, a radio base station, and a radio terminal for controlling an uplink transmission rate of terminal power in the field of mobile communication systems.

Background art

[0002] With respect to uplink transmission in a mobile communication system, that is, data transmission in a radio section directed from a wireless terminal (terminal) to a wireless base station (base station), 3GPP (3rd generatio n partnership Partnership Project) The wireless transmission rate control method that allows the station to control the transmission rate and perform high-speed uplink data transmission is standardized. This content is described in 3GPP TR (Technical Report) 25. 896 Version 6.0. 0 (Non-patent Document 1).

[0003] The high-speed dedicated channel allocated to each terminal used in this method is Enhanced—

This is called Dedicated CHannel, and hereinafter referred to as E-DCH.

[0004] For example, there are one radio terminal and two radio base stations P and Q. Between the terminal and the radio base station P, E-DCH described in 3GPP TR25. 896 is already set. Suppose it is a life.

[0005] When a wireless terminal moves and enters a handover region where cells of wireless base station P and wireless base station Q overlap, the wireless terminal transmits an E-DCH setting request to wireless base station Q, E-DCH is set between the radio base station Q and the radio terminal by a predetermined procedure.

[0006] When the wireless terminal determines that the transmission speed of data transmitted from itself has been increased! /, It requests both the wireless base station P and the wireless base station Q to increase the transmission rate (rate). The wireless base station P and wireless base station Q that have received the signal transmit a signal (Grant) indicating whether control is possible for the signal, and may or may not allow an increase in the transmission rate. Instruct. Here, for example, it is assumed that the radio base station P is not possible and the radio base station Q is acceptable. The wireless terminal determines the uplink transmission rate based on the received Grant signal. [0007] Non-Patent Document 1: 3GPP TR (Technical Report) 25. 896 V6. 0. 0 Disclosure of Invention

Problems to be solved by the invention

[0008] If the wireless terminal increases the uplink transmission rate based on the permission signal from the wireless base station Q, the amount of interference power at the wireless base station device P that transmitted the failure may increase. There is sex.

[0009] In addition, when the wireless terminal does not increase the transmission rate based on the impossible signal from the wireless base station P, it is not possible to efficiently transmit uplink data.

[0010] The present invention has been made to solve the above-described problems, and in particular, in the case of a handover in which a terminal sets E-DCH with a plurality of base stations, a plurality of By specifying the radio base station that is appropriate for performing the control when the radio base station controls the uplink transmission rate in the radio section with one radio terminal (determines whether the transmission rate can be changed). It aims at suppressing the amount of interference as a network.

Means for solving the problem

[0011] The present invention is a communication control method in a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station control device that controls the radio base station. A handover state detecting step for detecting that the wireless terminal is connected to a plurality of the wireless base stations, and any one of the plurality of wireless base stations connected to the wireless terminal. A rate control radio base station determination step for determining a rate control radio base station having the right to determine whether or not to accept a transmission rate change request.

The invention's effect

[0012] According to the present invention, it is possible to control the uplink transmission rate while suppressing the amount of interference, and it is possible to effectively use resources and efficiently transmit data as a system.

Brief Description of Drawings

FIG. 1 is a configuration diagram of a network in the present invention. FIG. 2 is a functional block diagram of a radio base station controller of the present invention.

FIG. 3 is a functional block diagram of a radio base station according to the present invention.

FIG. 4 is a functional block diagram of a wireless terminal according to the present invention.

FIG. 5 is a flowchart of E-DCH setting in Embodiment 1 of the present invention.

FIG. 6 is a flowchart of rate control in the first embodiment of the present invention.

FIG. 7 is a flowchart of rate control in the second embodiment of the present invention.

FIG. 8 is a flowchart of rate control resetting in the third embodiment of the present invention. Explanation of symbols

[0014] 1, 2 radio base station, 3 radio terminal, 4, 5 cell, 6 radio base station controller, 7 core network, 21 receiver, 22 transmitter, 23 measurement information manager, 24 E-D CH setting Management unit, 25 E-DCH rate control radio base station management unit, 31 Terminal signal reception unit, 32 Terminal signal transmission unit, 33 Rate control unit, 34 is E-DCH setting management unit, 35 Control station signal transmission unit, 36 Control station signal receiver, 37 Measurement controller, 41 Signal transmitter, 42 Signal receiver, 43 Measurement controller, 44 E-DCH controller, 45 Data transmission controller, 46 E-DCH rate controller.

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Embodiment 1.

The first embodiment will be described below with reference to FIGS.

FIG. 1 is a configuration diagram of a network in this embodiment, FIG. 2 is a functional block diagram related to this embodiment of the radio base station controller, and FIG. 3 is related to this embodiment of the radio base station. Functional block diagram, Fig. 4 is a functional block diagram related to this embodiment of the wireless terminal, Fig. 5 is a flowchart of E-DCH setting in this embodiment, and Fig. 6 is a rate control permission in this embodiment. It is a flowchart of.

In FIG. 1, 1 is a radio base station A, 2 is a radio base station B, 3 is a radio terminal, 4 and 5 are cell A indicating the radio wave coverage of radio base station Al and radio base station B2, respectively. , B, part of which overlaps. 6 is a radio base station controller (base station controller) that controls the radio base station Al and radio base station B2, and 7 is a core network that connects the radio base station controller 6 to other radio base station controllers. Indicates. Cell A4 and cell B5 above overlap This part is called a “node over area”.

[0018] The wireless base station Al, the wireless base station B2, and the wireless terminal 3 each perform wireless communication using a CDMA (Code Division Multiple Access) method. Absent. Radio base station Al, radio base station B2, and radio base station control device 6 perform wired communication.

[0019] Further, the high-speed dedicated channel allocated to each wireless terminal 3 used in this method is called Enhanced-Dedicated CHannel described in 3GPP rd generation Partnersnip Project) TR (Technical Report 25. 89 6). In this specification, it is called E-DCH.

[0020] In the radio base station controller 6 of Fig. 2, 21 is a receiving unit that receives a signal from the radio base station Al, the radio base station B2, or the radio terminal 3, 22 is a radio base station Al, and the radio base station B2 Alternatively, a transmitter that transmits a signal to the wireless terminal 3, 23 is a measurement information management unit that manages measurement information from the wireless base station Al, the wireless base station B2, or the wireless terminal 3, and 24 is a high-speed uplink E in the wireless section. — E— DCH setting management unit for setting and managing DCH; 25—Determining the radio base station (rate control radio base station) that performs uplink rate control in the radio section E— DCH rate control radio base station management unit (Rate control radio base station management means).

In the radio base station of FIG. 3, 31 is a terminal signal receiving unit that receives a signal from the radio terminal 3, 32 is a terminal signal transmitting unit (transmitting means) that transmits a signal to the radio terminal 3, and 33 is nothing. Rate control unit (rate control means) that performs rate control on E-DCH at line terminal 3, 34 is an E-DCH setting management unit, and 35 is a control station signal that transmits a signal to radio base station controller 6 , 36 is a control station signal receiving unit that receives a signal of radio base station control transmission power, and 37 is a measurement control unit (measurement control means) that measures a radio wave state.

In wireless terminal 3 of FIG. 4, 41 is a signal transmission unit (transmission means) that transmits a signal to the radio base station, 42 is a signal reception unit that receives a signal from the radio base station, and 43 is a radio wave receiver. Measurement control unit (measurement control means) that measures the situation, 44 is an E-DCH control unit that sets the E-DCH, 45 is a data transmission control unit that controls the transmission of data on the E—DCH, and 46 is an E— This is an E-DCH rate controller that controls the rate on the DCH.

Next, the operation will be described based on the flowcharts of FIGS. First, in FIG. 5, the wireless terminal 3 has already set E-DCH (S51) with the wireless base station A1 in the cell A4 of the wireless base station A1, and the wireless base station A1 is on the E-DCH. Assume that rate control is being implemented. The radio terminal 3 measures the radio wave state received from the radio base station A1 by the measurement control unit 43, and notifies the radio base station A1 of the measurement result (terminal reception state measurement result) from the signal transmission unit 41 (S52).

[0024] Further, in the radio base station A1, the terminal signal receiving unit 31 receives the reception status measurement result notification from the radio terminal 3, and the control station signal transmitting unit 35 sends the terminal reception status measurement result notification to the radio base station control device. Forward to 6. Further, the radio base station A1 also measures the radio wave state by the measurement control unit 37, and notifies the measurement result (base station reception state measurement result) from the control station signal transmission unit 35 to the radio base station control device 6 (S53). The order of the reception status measurement result notifications S52 and S53 is not limited to this and is arbitrary. The radio base station controller 6 receives the measurement results from the radio terminal 3 and the radio base station A1 at the reception unit 21, and accumulates and manages the measurement results in the measurement information management unit 23 (S54).

[0025] Next, when the wireless terminal 3 moves to the handover area of the wireless base station A1 and the wireless base station B2, the E-DCH is set from the E-DCH control unit 44 to the wireless base station B2 via the signal transmission unit 41. A request is transmitted (S55). In the radio base station B2, the E-DCH setting request signal from the radio terminal 3 is transferred to the radio base station controller 6 through the terminal signal receiver 31 and the control station signal transmitter 35. The radio base station controller 6 receives the E-DCH setting request from the radio terminal 3 at the receiving unit 21 and confirms whether or not the E-DCH setting can be set by the E-DCH setting management unit 24. The unit 22 is used to transmit an E-DCH setting instruction to the radio base station B2 (S56). Whether the E-DCH setting management unit 24 can set the E-DCH is determined, for example, from the remaining resources (transmission power, code number, etc.) of the target radio base station B2.

[0026] In the radio base station B2, the E-DCH setting instruction is received from the control station signal receiving unit 36, and E

The DCH setting unit 34 sets E-DCH with the wireless terminal 3 (S57).

[0027] The radio base station B2 that has completed the E-DCH setting with the radio terminal 3 notifies the radio base station control device 6 that the setup has been completed (S58). As a result, the radio base station controller 6 detects in the E—DCH setting management unit 24 that the radio terminal 3 is connected to the radio base stations Al and B2 and is in the SHO (Soft Handover: S59) Wireless base station B In 2, the radio wave condition is measured by the measurement control unit 37 in the same manner as the radio base station Al, and the measurement result is notified from the control station signal transmission unit 35 to the radio base station control device 6 (60). The radio base station controller 6 receives the measurement information from the radio base station B2 at the reception unit 21, and stores and manages the measurement results in the measurement information management unit 23 (61).

[0028] In the above operation, the radio wave state (measurement result) measured by the wireless terminal is the reception power value of the pilot signal common to the wireless terminals in the same cell or the transport channel. The block error rate is described in 3GPP as TS25.302V3.1, CH, CPI, ri Received Signal Code Power and Transport channel block error rate (BLER). The radio wave conditions (measurement results) measured by radio base stations Al and B2 are the total received power value, the ratio of the total transmission power to the maximum transmission power, the signal-to-interference ratio (interference wave ratio: SIR), the transformer The bit error rate of the port channel, etc. In the above 3GPP TS25.302V3.1.60, the Received Total

Wideband power ^ Transmitted Carrier Power ^ Signal to Interference Ratio and Transport channel BER (bit error rate).

[0029] Next, the radio base station controller 6 also receives the radio base station Al, the radio base station B2, and the radio terminal 3 and based on the measurement result information stored in the measurement information management unit 23, the E-DCH rate The control radio base station management unit 25 determines whether the radio base station (rate control radio base station) that performs rate control on the E-DCH is either the radio base station A1 or the radio base station B2 (S62).

[0030] At this time, which radio base station is to be determined as the rate control radio base station is selected, for example, by selecting a radio base station having a larger interference power value and a larger one (SIR is greater or smaller) and If the SIRs of the base stations are the same, for example, the bit error rate (corresponding to the transport channel BER) is small, and the radio base station with the smaller one is selected. Here, it is assumed that the radio base station B2 is selected as the rate control radio base station.

[0031] The radio base station controller 6 that has determined the E-DCH rate control radio base station in the E-DCH rate control radio base station management unit 25 is not selected as the E-DCH rate control radio base station. An instruction to stop E-DCH rate control is transmitted to the radio base station (radio base station A1 in this example) via the transmitter 23 (S63). Wireless base station Al The E-DCH rate control stop instruction is received by the rate control unit 33 via the signal receiving unit 36, and the E-DCH rate control process for the wireless terminal 3 is stopped (S64).

[0032] After that, in the wireless terminal 3, when the data transmission control unit 45 determines that the data to be transmitted needs to use a higher data rate from the transmission buffer amount (not shown) or the like, E — Request the DCH rate controller 46 to increase the rate of E—DCH by presenting a rate larger than the current rate. The E-DCH rate control unit 46 that has received the rate increase request transmits an E-DCH rate increase request via the signal transmission unit (S65).

[0033] In the radio base station A1 that has received the rate increase request by the terminal signal receiver 31, the rate controller 33 determines whether or not the E-DCH rate control in the radio terminal 3 is necessary. In this example, since the radio base station A1 has received the rate control stop instruction related to the radio terminal 3, it determines that the rate control is unnecessary and discards (ignores) the rate increase request (S66). Similarly, in the radio base station B 2, the terminal signal receiving unit 31 receives the rate increase request, and the rate control unit 33 determines whether or not rate control needs to be performed. In this example, since the radio base station B2 is a rate control radio base station for the radio terminal 3, control is necessary, and it is determined whether or not the remaining amount of resources, etc. can be increased, and the terminal signal transmission unit 32 is used. The control result is transmitted to the wireless terminal 3 (S67). In this example, the rate increasing rate NG may be OK.

[0034] In the case of OK, the power to notify the permitted rate from the wireless base station B2 to the wireless terminal 3 at the same time is, for example, the following (1) and (2) as a notification method of this rate.

(1) Notify the size of a predetermined data block and the transmission time of this data block. This is, for example, a transmission corresponding to the TBS (Transport Block Size) and TTI (Transmission Time Interval) described in 3GPP TS25.302. In 3GPP TS25.302, TBS and TTI are TF (Transport Format).

(2) The ratio X of the transmission power amount of the control channel and the transmission power amount of the data channel and the corresponding rate are defined in advance, and the above X is notified.

In wireless terminal 3, the result of rate increase control is received by E-DCH rate control unit 46 via signal receiving unit 42, and the control result is determined (S68). If the rate increase is OK, the result is notified to the data transmission control unit 45, the transmission data rate is increased, and the data transmission is transmitted via the signal transmission unit 41. If the rate increase control result is NG, the data transmission control unit 45 is notified to that effect. Know and transmit data without increasing the data rate.

[0036] As described above, the rate control radio base station has the right to determine whether or not to increase in response to a rate increase request from a radio terminal.

[0037] In the above description, S52 is a terminal reception state measurement result notification step in the present invention. Similarly, S53 and S60 are a base station reception state measurement result notification step, and S59 is a handover state detection step. S62 is a rate control radio base station determination step, S63 is a rate control stop instruction step, S64 is a rate control stop instruction reception step, S65 and S71 are rate change request transmission steps, S66 is a rate change request discard step, S69 Is a rate control radio base station information notification step, S70 is a rate control radio base station control information reception step, S74 and S75 are rate permission result determination steps, and S76 is a rate control start instruction step.

[0038] Further, the E-DCH setting management unit 24 is a handover state detecting means in the present invention.

[0039] Further, an E-DCH rate increase request transmitted from the wireless terminal device at S65, S71, etc. is an uplink transmission rate change request, and a response to whether the rate increase is transmitted from the wireless base station at S67, S72, S73, etc. Is an uplink transmission rate change instruction.

[0040] As described above, the E-DCH is set by the radio base station controller, and the most suitable radio base station is selected from all the radio base stations. — Since it is configured not to implement DCH rate control processing, it is possible to control the E—DCH data rate with reduced interference, enabling efficient use of resources and efficient data transmission as a system. .

[0041] In the above example, in rate control radio base station determination (S62), the base station with the larger interference power value is selected. If the interference power values are the same, the base station with the smaller bit error rate is selected. However, each measurement item measured by the wireless terminal and the wireless base station (for example, 3GPP, CPICH Received Signal Code Power, Transport channel block error rate, As a measurement item of a station, priority may be given to Received fotai Wideband power ^ Transmitted and arrier Power ^ bignal to Interference Ratio, Transport channel BER) as a reference for selection. [0042] That is, for example, in a system compliant with 3GPP, a radio base station having a larger CPICH Received Signal Code Power and a radio base station having a smaller Transport channel BER are selected for measurement items of the radio terminal. The radio base station with the larger Received Total Wideband power for the measurement items of the radio base station,

The measurement result of the highest priority measurement item is defined as the radio base station with the higher Transmitted Carrier Power, the radio base station with the larger Signal to Interference Ratio, and the radio base station with the smaller Transport channel BER. Based on the above, the base station is determined, and if the measurement result of the highest priority measurement item is equal, the base station is determined based on the measurement result of the next priority. The rate control radio base station may be determined based on the measurement item. By assigning priorities to many measurement items, rate-controlled radio base stations can be easily determined, and the system configuration can be made flexible by changing the prioritization method.

[0043] In addition, when the measurement item is fixed to any one and the measurement result is LV for two base stations, etc., the rate control radio base station up to that point continues as the rate control radio base station. Also good. In this case, if the measurement item is fixed to the measurement item at the wireless terminal, the reception state measurement result notifications S53 and S60 from the wireless base stations Al and B2 in FIG. 5 are deleted as the criterion for determining the rate control wireless base station. However, if the measurement item is fixed to the measurement item at the radio base station, the reception state measurement result notification S52 from the radio terminal may be deleted as a criterion for determining the rate control radio base station. In this case, since the rate control radio base station determination (S62) can be started before receiving all reception state measurement result notifications, the processing is speeded up and the configuration of the radio base station control device 6 is simplified.

[0044] The rate control radio base station may be determined by majority decision of the number of radio base stations selected by each measurement item, or may be determined by weighting each measurement item. In this case, the influence of measurement error can be minimized.

In the above example, the terminal reception state measurement result notification (S52) from the wireless terminal 3 and the base station reception state measurement result notification (S53) from the wireless base station A1 are sent before the SHO detection (S59). However, in this case, it may be after SHO detection (S59). The terminal reception state measurement result notification is transmitted to the radio base station controller 6 through both the radio base station Al and the radio base station B2.

In addition, in the above example, one rate-controlled radio base station can be determined in the same manner from three or more radio base stations, which are described using two radio base stations as an example.

In the above example, the request for changing the uplink transmission rate is a request for maintaining or decreasing the transmission rate, not just the request for increasing the power, which explains the case where the request for changing the transmission rate is a request for increasing the transmission rate.

In the above example, the transmission rate change instruction transmitted from the radio base station is transmitted in response to the transmission rate change request from the radio terminal. However, in the transmission rate change request from the radio terminal, Even if it does not correspond, the radio base station may voluntarily transmit, for example, when there is room in the resources of the radio base station.

[0049] Further, in the above description, an example in which E-DCH is set between a radio terminal and a radio base station has been described, but other channels may be used without being limited thereto.

[0050] Embodiment 2.

In Embodiment 1 above, an example has been described in which the radio base station control device selects a rate control radio base station and transmits an instruction to stop E-DCH rate control to the radio base station that has not been selected. In this embodiment, an example is shown in which a radio base station control device that has selected a rate control radio base station transmits rate control radio base station information to a radio terminal.

[0051] The configurations of the network, the radio base station control device, the radio base station, and the radio terminal in this embodiment are the same as those in Fig. 1 and Fig. 4 described in the first embodiment. Since the operation until the base station is determined is the same as that up to S62 in FIG. 5 and FIG. 6 described in Embodiment 1, the description thereof is omitted. FIG. 7 is a flowchart of the operation in this embodiment. The same numbers as those in FIG. 6 indicate the same operations.

In FIG. 7, radio base station control apparatus 6 determines a rate control radio base station that performs E-DCH rate control by the same procedure as in the first embodiment (S62).

Subsequently, the radio base station control device 6 uses the rate control radio base station information describing the rate control radio base station that performs E-DCH rate control as an E-DCH rate control radio base station as a result of the determination. Created by the management unit 25 and transmitted from the transmission unit 22 via the wireless base station A1 and wireless It transmits to the wireless terminal 3 through two routes via the base station B2 (S69). In wireless terminal 3, rate control wireless base station information is received by E-DCH rate control unit 46 via signal receiving unit 42, and the wireless base station that performs E-DCH rate control of its own terminal is not shown in the storage unit. Store (S 70). In this example, it is assumed that the radio base station control device 6 has created rate control radio base station information specifying the radio base station B2 as a radio base station that performs E-DCH rate control.

[0054] Next, in the wireless terminal 3, when the data transmission control unit 45 determines that the data to be transmitted needs to use a higher data rate from the transmission buffer amount (not shown), E-DCH Requests the rate controller 46 to increase the E-DCH rate. The E-DCH rate control unit 46 that has received the rate increase request transmits an E-DCH rate increase request via the signal transmission unit 41 (S71).

[0055] The radio base station Al that has received the rate increase request at the terminal signal receiving unit 31 determines whether or not the rate can be increased based on the resource remaining amount of its own station, and the control result is transmitted via the terminal signal transmitting unit 32 to the wireless terminal. Send to 3 (S72). In this example, rate increase OK is acceptable. Similarly, the radio base station 2 determines whether or not the rate can be increased, and transmits the control result to the radio terminal 3 (S73). In this example, rate increase OK is acceptable.

In wireless terminal 3, the result of rate increase control from wireless terminal A1 is received by E-DCH rate control unit 46 via signal receiving unit 42, and the control result is determined with reference to the rate control radio base station information. . In this example, since the radio base station A1 is not described in the rate control radio base station information as the E-DCH rate control radio base station, the control result notification from the radio base station A1 is discarded (S74). Next, the E-DCH rate control unit 46 determines the rate control result notification from the radio base station B2 with reference to the rate control radio base station information, and the radio base station 2 is designated as the E DCH rate control radio base station. Therefore, this control result notification is validated, and since the control result (OKZNG) is OK, the transmission data rate is changed (S75).

[0057] As described above, the E-DCH is set by the radio base station controller, and the optimum radio base station is selected from all the radio base stations and notified to the radio terminal. The radio terminal selects Because it was configured to ignore the limited rate control of radio base stations, it was possible to control the E-DCH data rate with reduced interference, enabling efficient use of resources and efficient data transmission as a system In addition, if the base station is a rate-controlled base station The processing of the radio base station that does not need to determine whether or not is reduced, and the configuration can be simplified.

Embodiment 3.

In Embodiments 1 and 2 above, the power shown when a new radio base station for setting E-DCH is added. In this embodiment, radio that performs E-DCH rate control due to changes in the radio environment, etc. An example of changing the base station is shown.

The configurations of the network, the radio base station control device, the radio base station, and the radio terminal in this embodiment are the same as those in FIG. 1 and FIG. 4 described in the first embodiment, respectively.

FIG. 8 is a flowchart of the operation in this embodiment. In the figure, the same reference numerals as those in FIGS. 5 and 6 are the same processes as those in the first and second embodiments, respectively. Indicates. In addition, the wireless terminal 3 has already set E-DCH between the wireless base station Al and the wireless base station B2, and the wireless base station B2 is a rate control wireless base station that performs E-DCH rate control. Suppose that it is specified.

[0061] As described with reference to Figs. 5 and 6 in the first embodiment, the radio terminal 3, the radio base station Al, and the radio base station B2 measure the radio wave conditions, and the radio base station controller 6 measures them. The result is notified (S52) (S53) (S60). However, in this case, the notification from the wireless terminal 3 in S52 is notified to the wireless base station control device 6 through (transferred by) both the wireless base station Al and the wireless base station B2. The radio base station controller 6 stores and manages the notification of the measurement result (S 61). Next, the radio base station control device 6 determines a rate control radio base station that performs E-DCH rate control in the same manner as in the first embodiment based on this measurement result notification (S62). Here, it is assumed that, as a result of the determination, it is determined that the radio base station A1 is more suitable as a rate control radio base station than the radio base station B2 designated as the rate control radio base station at this time. The radio base station controller 6 sends an E-DCH rate control stop instruction from the E-DCH rate control radio base station management unit 25 to the radio base station B2 via the transmission unit 22 (63), and the radio base station B2 The E-DCH rate control stop instruction is received by the rate control unit 33 via the control station signal receiving unit 36, the E-DCH rate control for the radio base station 3 is stopped (S64), and then the radio terminal 3 When the rate increase request is received from the network, this rate increase request is discarded (similar to FIG. 6, S65 and S66 in the first embodiment). However, in FIG. 6 described in the first embodiment, the E-DCH rate control stop instruction in S63 is sent to the radio base station A1. Although it is described that the radio base station Al stops the E-DCH rate control in S64, in FIG. 8 relating to the present embodiment, S63 and S64 respectively replace the radio base station A1 with the radio base station B2. It has become the operation.

Next, the radio base station controller 6 transmits an instruction to start E-DCH rate control from the E-DCH rate control radio base station management unit 25 to the radio base station A 1 via the transmission unit 22 (S 76). When the radio base station A1 receives the instruction to the rate control unit 33 via the control signal receiving unit 36, starts rate control processing for the radio terminal 3 (S77), and receives a rate increase request from the radio terminal 3, The rate control process for the request is started (similar to FIG. 6, S65 and S67 in the first embodiment).

[0063] In the determination of the rate control radio base station in S62, the radio base station A1 designated as the rate control radio base station at this time is more suitable as the rate control radio base station than the radio base station B2. If it is determined, the operation returns to S52, and the reception state measurement results from the wireless terminal 3, the wireless base station A1, and the wireless base station B2 are transmitted to the wireless base station controller 6 again (S52, S53, S60). The operation force after S61 is repeated.

[0064] As described above, when the rate control radio base station is changed, a rate control stop instruction is issued to the previous rate control radio base station, so that the rate control radio base station can be changed smoothly. The

[0065] In the above example, the timings of the reception status measurement result notifications S52, S53, and S60 are asynchronous, so the order may not be the same, and the radio base station controller 6 has three reception status measurements. As soon as the result notification is received, the E-DCH rate control radio base station determination of S62 is performed.

[0066] The radio base station controller 6 that synchronizes the timings of S52, S53, and S60 based on an instruction from the radio base station controller 6 can perform the E-DCH rate control radio base station of S62 at a constant cycle. Make a decision.

[0067] Also, as described in the first embodiment, in the rate control radio base station determination of S62, the measurement item is fixed to one of the deviations, and the measurement result is two base stations. In this case, it is possible to continue the rate control radio base station up to that point as a rate control radio base station, and in this case, the measurement item in the radio terminal is fixed as the measurement item. In this case, the reception status measurement result notifications S53 and S60 from the radio base stations Al and B2 in FIG. 8 are the measurement items that may be deleted as the determination criteria for determining the rate control radio base station. When fixed to the item, the reception status measurement result notification S52 from the radio terminal may be deleted as a criterion for determining the rate control radio base station. The notification is received, and rate control radio base station determination (S62) is performed periodically or irregularly as necessary. In this case, since the rate control radio base station determination (S62) can be started before receiving all reception state measurement result notifications, the processing is speeded up and the configuration of the radio base station control device 6 is simplified.

[0068] In the above example, the E-DCH rate control stop instruction for transmitting the E-DCH rate control stop instruction may be transmitted first.

[0069] Further, in the above example, the radio base station control device transmits a rate control stop instruction to the radio base station that is out of the rate control radio base station (S64), and sends it to the new rate control radio base station. In this example, the rate control start instruction is transmitted to the wireless terminal (S76). However, as described in Embodiment 2 with reference to FIG. The wireless base station information may be notified (FIG. 7, S69). In this case, the operation is the same as in FIG. 7, and it is not necessary for the radio base station to determine whether or not the radio base station is capable of rate control. The processing of the radio base station is reduced, and the configuration can be simplified.

Industrial applicability

The present invention can be applied to a communication system including a radio base station control device, a radio base station, and a radio terminal.

Claims

The scope of the claims

[1] A communication control method in a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station control device that controls the radio base station,

A handover state detection step of detecting that the wireless terminal is connected to a plurality of the wireless base stations;

A rate control radio base station that determines whether or not there is a difference between a plurality of radio base stations connected to the radio terminal as a rate control radio base station having the right to determine whether or not to accept an uplink transmission rate change request of the radio terminal power Station judgment step

A communication control method in a wireless communication system.

[2] A base station reception state measurement result notifying step in which a plurality of wireless base stations connected to the wireless terminal measure a reception state from the wireless terminal and notify the measurement result as a base station reception state measurement result When,

A terminal reception state measurement result notification step in which the wireless terminal measures reception states from a plurality of wireless base stations connected to the wireless terminal, and notifies the measurement results as terminal reception state measurement results;

Including at least one of

In the rate control radio base station determination step, a rate control radio base station is determined based on at least one of the notified base station reception state measurement result and terminal reception state measurement result.

The communication control method in the radio communication system according to claim 1.

[3] In the rate control radio base station determination step, an uplink transmission rate change request transmitted by the radio terminal is ignored for radio base stations other than the rate control radio base station determined in the step. The communication control method in the wireless communication system according to claim 1, further comprising a rate control stop instruction step for instructing.

[4] In the rate control radio base station determining step, a rate control radio base station information notifying step for notifying the radio terminal of the rate control radio base station determined in the step as rate control radio base station information; The radio terminal refers to the rate control radio base station information, and among the uplink transmission rate change instructions from the plurality of radio base stations in response to the uplink transmission rate change request transmitted by the radio terminal, the rate control radio base station Rate permission result judgment step that judges that only the upstream uplink transmission rate change instruction is valid

The communication control method in the radio | wireless communications system of Claim 1 characterized by the above-mentioned

[5] In the rate control radio base station determination step, an uplink transmission rate change instruction is transmitted to the rate control radio base station determined in response to the uplink transmission rate change request transmitted by the radio terminal. Rate control start instruction step

The communication control method in the radio | wireless communications system of Claim 1 or Claim 3 characterized by the above-mentioned.

[6] Communication control in a radio base station controller of a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station controller that controls the radio base station A method,

A communication control method in a radio base station control device.

[7] A base station reception state reception step of receiving a base station reception state measurement result transmitted by measuring a reception state from each of the wireless terminals by a plurality of wireless base stations connected to the wireless terminal;

A terminal reception state measurement result receiving step for receiving a terminal reception state measurement result transmitted by the wireless terminal measuring reception states from a plurality of wireless base stations connected to the wireless terminal; and

Including at least one of

In the rate control radio base station determination step, the received base station reception status is received. Rate control radio base station is determined based on at least one of the state measurement result and the terminal reception state measurement result

The communication control method in the radio base station control device according to claim 6.

[8] Instructing the radio base station other than the rate control radio base station determined in the rate control radio base station determination step to ignore the uplink transmission rate change request transmitted by the radio terminal Rate control stop instruction step

The communication control method in the radio base station control device according to claim 6, comprising:

[9] In the rate control radio base station determination step, the rate control radio base station information determined in the step is notified to the radio terminal as rate control radio base station information, and the radio terminal transmits the rate control radio base station information. With respect to the uplink transmission rate change request transmitted by the wireless terminal, it is determined that only the uplink transmission rate change instruction from the rate control radio base station is valid among the uplink transmission rate change instructions from the plurality of radio base stations. Do

Rate control radio base station information notification step that enables

[10] An uplink transmission rate change instruction is transmitted to the rate control radio base station determined in the rate control radio base station determination step in response to an uplink transmission rate change request transmitted by the radio terminal. Rate control start instruction step for instructing

9. The communication control method in the radio base station control device according to claim 6 or 8, characterized by comprising:

[11] A communication control method in a radio base station of a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station control device that controls the radio base station. There,

The radio terminal is connected to a plurality of radio base stations including the radio base station, and is a rate control radio base station other than the radio base station having the right to determine whether or not to accept an uplink transmission rate change request from the radio terminal A rate control stop instruction receiving step for receiving a rate control stop instruction when a radio base station is determined; A communication control method in a radio base station, comprising: a rate change request discarding step of discarding a transmission rate change request when receiving a transmission rate change request from the radio terminal after the rate control stop instruction receiving step.

[12] A communication control method in a radio terminal of a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station control device that controls the radio base station. ,

When the radio terminal is connected to a plurality of radio base stations, the rate control radio base station having the right to determine whether or not to accept an uplink transmission rate change request from the radio terminal receives the power of which radio base station A rate control radio base station information receiving step, a rate change request transmitting step for transmitting an uplink transmission rate change request,

A rate permission that receives an uplink transmission rate change instruction for the uplink transmission rate change request from a plurality of radio base stations in a connected state, and determines that only the uplink transmission rate change instruction of the rate control radio base station power is valid. Result judgment step

A communication control method in a wireless terminal.

[13] In a wireless communication system including a wireless terminal, a wireless base station that performs wireless communication with the wireless terminal, and a wireless base station control device that controls the wireless base station.

The radio base station controller is

Handover state detecting means for detecting that the wireless terminal is connected to a plurality of the wireless base stations;

A rate control radio base station that determines whether or not there is a difference between a plurality of radio base stations connected to the radio terminal as a rate control radio base station having the right to determine whether or not to accept an uplink transmission rate change request of the radio terminal power Station management means

A wireless communication system comprising:

[14] The radio terminal transmits a measurement control unit that measures reception states from a plurality of radio base stations connected to the radio terminal, and transmits the measured reception state as a terminal reception state measurement result. Signal transmission means

With The radio base station includes a measurement control unit that measures a reception state from a radio terminal connected to the radio base station, and a signal transmission unit that transmits the measured reception state as a base station reception state measurement result.

With

The rate control radio base station management means of the radio base station control apparatus determines a rate control radio base station based on at least one of the terminal reception state measurement result and the base station reception state measurement result.

The wireless communication system according to claim 13, wherein

[15] A radio base station control device of a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station control device that controls the radio base station,

A radio base station control device comprising:

[16] The rate control radio base station management means includes:

A plurality of radio base stations connected to the radio terminal each measure a reception status from the radio terminal and transmit a base station reception status measurement result;

A terminal reception state measurement result of the wireless terminal measuring and transmitting reception states from a plurality of wireless base stations connected to the wireless terminal;

The rate control radio base station is determined based on at least one of

16. The radio base station control device according to claim 15, wherein

[17] The rate control radio base station management means instructs a radio base station other than the determined rate control radio base station to ignore the uplink transmission rate change request transmitted by the radio terminal.

16. The radio base station control device according to claim 15, wherein

[18] The rate control radio base station management means includes:

The determined rate control radio base station information is notified to the radio terminal as rate control radio base station information, and the radio terminal refers to the rate control radio base station information, and the uplink transmission transmitted by the radio terminal It is possible to determine that only the uplink transmission rate change instruction of the rate control radio base station power is valid among the uplink transmission rate change instructions from the plurality of radio base stations in response to the rate change request.

16. The radio base station control device according to claim 15, wherein

[19] The rate control radio base station management means includes:

18. The instructed rate control radio base station is instructed to transmit an uplink transmission rate change instruction in response to an uplink transmission rate change request transmitted by the radio terminal. The radio base station control device described in 1.

[20] A radio base station of a radio communication system including a radio terminal, a radio base station that performs radio communication with the radio terminal, and a radio base station control device that controls the radio base station, The terminal is connected to a plurality of radio base stations including the radio base station, and is a rate control radio base station having a right to determine whether or not to accept an uplink transmission rate change request from the radio terminal. When a base station is determined, a rate control stop instruction is received from the radio base station controller, and after receiving the rate control stop instruction, a transmission rate change request for the wireless terminal power is received. Rate control means to be discarded

A radio base station comprising:

[21] A wireless terminal of a wireless communication system including a wireless terminal, a wireless base station that performs wireless communication with the wireless terminal, and a wireless base station control device that controls the wireless base station, the wireless terminal Is connected to a plurality of radio base stations, it receives whether the rate control radio base station having the right to determine whether or not to accept an uplink transmission rate change request from the radio terminal is a V, misaligned radio base station. ,

An uplink transmission rate change request is transmitted, an uplink transmission rate change instruction for the uplink transmission rate change request is received from a plurality of connected radio base stations, and the uplink transmission rate from the rate control radio base station is received. Rate control unit that judges only change response as valid A wireless terminal comprising: