JP2007158835A - Wireless base station, mobile device, and combination control method for wireless base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high throughput of the entire E-DCH while preventing occurrence of throughput deterioration in uplink transmission when data are prevented from flowing into the E-DCH. <P>SOLUTION: The wireless base station 100 transmits notification condition information which is generated by a notification condition setting part 101 so as to allow a mobile device to notify reception quality information to the wireless base station executing an E-DCH connection. A notification information extraction part 106 extracts combinations between the reception quality information and the wireless base station executing the E-DCH connection from a received signal. A combination determination part 107 determines the propriety of the E-DCH connection of each wireless base station, which has a function for executing the E-DCH connection, and a control method for each wireless base station executing the E-DCH connection. By this, it is possible to prevent the occurrence of throughput deterioration in uplink transmission while immediately determining the combination between the mobile device and the wireless base station executing the E-DCH connection even when the data are prevented from flowing into the E-DCH. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio base station, a mobile device, and a radio base station combination control method for a mobile communication system that employs a high-speed channel dedicated for uplink transmission.

  Currently, the 3rd Generation Partnership Project (3GPP) uses HSUPA (High Speed Uplink Packet Access) for the purpose of speeding up the peak transmission speed of uplink in mobile communication systems, lowering transmission delay, and increasing throughput. A method called “packet access” has been studied (Non-Patent Documents 1 and 2).

  In this HSUPA system, an E-DCH (Enhanced Dedicated Channel), which is a high-speed channel dedicated for uplink transmission, is provided on the uplink between the mobile device and the radio base station. Since the technology for controlling the radio resources of the mobile devices connected to the E-DCH by each radio base station has a great influence on the throughput of radio transmission, a control method as shown in FIG. It is considered.

  FIG. 3 is a diagram for explaining a technique for controlling radio resources of a mobile device currently considered. In FIG. 3, three radio base stations 301, 302, and 303 are connected to the mobile device 304 via the E-DCH, respectively. In this case, the radio base station 302 can directly specify and control radio resources of the mobile device 304, and performs settings most suitable for the communication status of the own station. The other radio base stations 301 and 303 do not perform the above-described direct control, but can perform indirect control only by notifying a request for maintaining the radio resource of the mobile device 304 at the current value or raising or lowering the radio resource from the current value. Yes, aiming to improve the communication status of your station.

Thus, by controlling the radio resources of the mobile devices connected to the E-DCH in combination with the radio base stations that are directly controlled and the radio base stations that are indirectly controlled, the E- A method for improving the communication quality of the entire DCH and realizing high throughput is considered.
3GPP TR25.896 "Feasibility Study for Enhanced Uplink for UTRA FDD" 3GPP TS25.309 "FDD Enhanced Uplink; Overall description; Stage 2"

  FIG. 4 is a diagram for explaining the relationship between the movement of the mobile device and the communication quality. In FIG. 4, a mobile device 401 is connected to a radio base station (# 1) 402 under the control of point A and a radio base station (# 2) 403 under the control of point B via E-DCH. Yes. In this case, the communication quality between the mobile device 401 and the radio base station (# 1) 402 is good at the point A as shown by the curve 410, and deteriorates as the point B is approached. Also, the communication quality between the mobile device 401 and the radio base station (# 2) 403 is good at the point B as shown by the curve 411, and deteriorates as the point A is approached.

  Under such circumstances, when the mobile device 401 moves from the A point to the B point, the wireless base station (# 1) 402 and the wireless base station (# 2) 403 connected to the mobile device 401 via the E-DCH. The communication quality during the period decreases at the radio base station (# 1) 402 side, increases at the radio base station (# 2) 403 side, and reverses the point A. At this time, when data does not flow through the E-DCH, the mobile station does not transmit a signal, and the radio base station does not receive the signal. Therefore, the radio base station (# 1) 402 and the radio base station (# 2 ) 403 is delayed in noticing the change in communication quality.

  As described above, the radio resource control technology by each radio base station in the E-DCH does not consider a change in communication quality when data does not flow through the E-DCH. May be drastically reduced.

  The present invention has been made in view of such a point, and a radio base station capable of preventing a decrease in the throughput of uplink transmission when data is not flowing on the E-DCH and increasing the throughput of the entire E-DCH, An object of the present invention is to provide a combination control method for a mobile device and a radio base station.

  In order to solve this problem, the radio base station of the present invention employs an E-DCH (Enhanced Dedicated Channel), which is a high-speed channel dedicated to uplink transmission, on an uplink between a mobile device and each radio base station. A report condition setting means for setting a condition for causing the mobile station to report information indicating reception quality to a radio base station performing an E-DCH connection, and the report condition setting means A transmission unit for transmitting report condition information indicating a condition set by the mobile station, and a combination determination for determining an E-DCH control method for each radio base station based on information indicating reception quality transmitted from the mobile station And a control means for executing either radio resource direct control or radio resource indirect control in accordance with the determination by the combination determining means.

  According to the present invention, since the combination of a radio base station that establishes an E-DCH connection with a mobile device is determined in consideration of the reception quality at the mobile device, the change in communication quality even when no data flows through the E-DCH Therefore, it is possible to determine a combination of radio base stations that perform E-DCH connection with a mobile device immediately, and to prevent a decrease in uplink transmission throughput.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
FIG. 1 is a block diagram showing a configuration of a radio base station according to an embodiment of the present invention. The radio base station 100 shown in FIG. 1 is one of the direct control radio base station and the indirect control radio base station shown in FIG. 3 in the same manner as a radio base station having a function of performing general E-DCH connection. In addition to the function to be obtained, it is a so-called higher-level radio base station having a function of controlling a combination of such a direct control radio base station and an indirect control radio base station.

  That is, in order to realize these two functions, the radio base station 100 includes a report condition setting unit 101, a report condition information modulation / coding unit 102, a transmission / reception duplexer 103, an antenna 104, and a received signal processing unit 105. Report information extraction unit 106, combination determination unit 107, control method switching unit 108, radio resource direct control unit 109, radio resource indirect control unit 110, control information generation unit 111, control information modulation / code And the conversion unit 112. The received signal processing unit 105 includes other processing units such as a despreading unit in addition to the demodulating unit 105a, but only the demodulating unit 105a is shown here for the sake of simplicity.

  Next, FIG. 2 is a block diagram showing the configuration of the mobile device according to one embodiment of the present invention. A mobile device 200 shown in FIG. 2 is a mobile device having a function of performing an E-DCH connection. As functions related to the present embodiment, an antenna 201, a transmission / reception duplexer 202, a reception signal processing unit 203, a reporting condition, and the like. A storage unit 204, a measurement unit 205, a condition determination unit 206, a report information creation unit 207, and a report information modulation / coding unit 208 are provided. The received signal processing unit 203 includes other processing units such as a despreading unit in addition to the demodulating unit 203a, but only the demodulating unit 203a is shown here for the sake of simplicity.

  In the above configuration, the radio base station 100 acquires information indicating the reception quality for the radio base station performing the E-DCH connection from the mobile device 200 as described below, and performs indirect communication with the direct control radio base station. Control the combination of control radio base stations.

  First, in the radio base station 100, in FIG. 1, the report condition setting unit 101 sets a condition for causing the mobile device 200 to report information indicating the reception quality to the radio base station performing the E-DCH connection. Then, report condition information indicating the set condition is generated and transmitted to the report condition information modulation / coding unit 102. The report condition information modulation / coding unit 102 performs modulation and coding processing on the received report condition information, and transmits it to the mobile device 200 via the duplexer 103 and the antenna 104.

  On the other hand, in the mobile device 200, the received signal received by the antenna 201 in FIG. 2 is input to the received signal processing unit 203 via the duplexer 202. This received signal includes report condition information and a signal from a radio base station that performs an E-DCH connection.

  In received signal processing section 203, demodulation section 203 a demodulates report condition information included in the received signal, and sends it in parallel to report condition storage section 204 and measurement section 205. The report condition storage unit 204 stores the demodulated report condition, and sets the measurement target and the number of measurements in the measurement unit 205 among the report conditions.

  The measurement unit 205 measures a value indicating reception quality such as CIR (Carrier to Interference Ratio) based on the received signal to be measured demodulated by the demodulation unit 203 according to the set report condition. The measurement result is sent to the condition determination unit 206.

  The condition determination unit 206 compares the measurement result received from the measurement unit 205 with the report standard stored in the report condition storage unit 204, and sends the measurement result to the report information creation unit 207 when the report standard is satisfied. To do.

  The report information creation unit 207 creates a measurement result received from the condition determination unit 206, that is, information (hereinafter referred to as “report information”) indicating reception quality with respect to a radio base station performing E-DCH connection. The report information is modulated and encoded by the report information modulation / coding unit 208 and transmitted to the radio base station 100 via the duplexer 202 and the antenna 201.

  Therefore, in radio base station 100, the received signal received by antenna 104 in FIG. 1 is input to received signal processing section 105 via transmission / reception duplexer 103. In received signal processing section 105, demodulation section 105 a demodulates report information transmitted from mobile device 200 and sends it in parallel to report information extraction section 106, radio resource direct control section 109 and radio resource indirect control section 110. To do.

  The report information extraction unit 106 extracts the reception quality at the mobile device 200 for each radio base station performing E-DCH connection from the received report information, and sends it to the combination determination unit 107.

  The combination determination unit 107 determines an E-DCH control method for each radio base station based on the reception quality of each radio base station for the mobile device 200, and determines the determination result of the own radio base station and other radio base stations. The data is sent to the control method switching unit 108. The control method switching unit 108 of the own radio base station and other radio base stations activates one of the radio resource direct control unit 109 and the radio resource indirect control unit 110 according to the determination.

  The combination determination unit 107 determines the E-DCH control method as follows, for example. That is, radio base stations are arranged in order of good reception quality, the radio resource direct control method is set for the radio base station with the best reception quality, and the reception quality set by the system is satisfied among other radio base stations. The radio resource indirect control method is set to a certain number of radio base stations. Then, neither control method is set for the remaining radio base stations, and the E-DCH connection is disconnected.

  As a result, the direct control radio base station and the indirect control radio base station determined based on the reception quality of the mobile device 200 shift to an operation of controlling the radio resources of the mobile device 200.

  That is, when the radio resource direct control unit 109 in the direct control radio base station receives an activation instruction from the control method switching unit 108, the radio resource direct control unit 109 determines the radio resource allocated to the E-DCH based on the report information received from the demodulation unit 105a. The upper limit value is calculated and sent to the control information generation unit 111.

  Further, when there is an activation instruction from the control method switching unit 108, the radio resource indirect control unit 110 in the indirectly controlled radio base station, based on the report information received from the demodulation unit 105a, the radio resources allocated to the E-DCH. Is determined to be increased, maintained, or decreased, and the information is sent to the control information generation unit 111.

  The control information generation unit 111 generates information received from one of the radio resource direct control unit 109 and the radio resource indirect control unit 110 as control information that informs the mobile device 200, and sends it to the control information modulation / coding unit 112. The control information modulation / coding unit 112 performs modulation and coding processing on the received control information, and transmits it to the mobile device 200 via the transmission / reception duplexer 103 and the antenna 104.

  As described above, the radio base station 100 acquires information indicating reception quality from the mobile device 200, and determines whether or not E-DCH connection is possible for each radio base station having a function of performing E-DCH connection based on this information. A control method to be applied to a radio base station capable of DCH connection is determined. This can be done even when no data is flowing on the E-DCH. That is, even when data is not flowing on the E-DCH, it is possible to determine the combination of the mobile station 200 and the radio base station that performs the E-DCH connection immediately in response to a change in communication quality.

  Here, as can be understood from the above description, the report condition setting unit 101, the report information extraction unit 106, and the combination determination unit 107 in the radio base station 100 determine the combination of the direct control radio base station and the indirect control radio base station. This is the main element that realizes the function to be controlled. In the mobile communication system, a host device (radio network control device) that manages and manages each radio base station is provided. The radio network control device includes a report condition setting unit 101, a report information extracting unit 106, and a combination determining unit 107. All or a part (such as the combination determining unit 107) may be provided.

  Further, in the mobile device 200, the case where the CIR is used as the reception quality information to be transmitted in response to the request of the radio base station 100 has been described. However, for example, RSCP (Received Signal Code Power), path loss, etc. But it ’s okay.

  As described above, according to the present embodiment, since the combination of the radio base station that performs E-DCH connection with the mobile device is determined in consideration of the reception quality at the mobile device, data does not flow through E-DCH. Even in this case, it is possible to determine a combination of radio base stations that perform E-DCH connection with a mobile device in response to a change in communication quality, and to prevent a reduction in uplink transmission throughput. As a result, high throughput of the entire E-DCH can be achieved.

  The present invention is suitable for increasing the throughput of the entire E-DCH in a mobile communication system that employs E-DCH, which is a dedicated channel for uplink transmission.

The block diagram which shows the structure of the wireless base station which concerns on one embodiment of this invention The block diagram which shows the structure of the mobile apparatus which concerns on one embodiment of this invention. The figure explaining the technology to control the radio resource of the mobile equipment currently considered Diagram explaining the relationship between movement of mobile equipment and communication quality

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Radio base station 101 Report condition setting part 102 Report condition information modulation and encoding part 103 Transmission / reception duplexer 104 Antenna 105 Reception signal processing part 105a Demodulation part 106 Report information extraction part 107 Combination determination part 108 Control system switching part 109 Radio | wireless resource direct Control unit 110 Radio resource indirect control unit 111 Control information generation unit 112 Control information modulation / coding unit 200 Mobile device 201 Antenna 202 Transmission / reception duplexer 203 Received signal processing unit 203a Demodulation unit 204 Reporting condition storage unit 205 Measurement unit 206 Condition determination unit 207 Report information creation unit 208 Report information modulation / coding unit

Claims (8)

A radio base station of a mobile communication system that employs an E-DCH (Enhanced Dedicated Channel), which is a high-speed channel dedicated to uplink transmission, on an uplink between a mobile device and each radio base station,
A reporting condition setting means for setting a condition for causing the mobile device to report information indicating reception quality to a radio base station performing E-DCH connection;
Transmitting means for transmitting report condition information indicating the condition set by the report condition setting means to the mobile device;
Combination determining means for determining an E-DCH control method for each radio base station based on information indicating reception quality transmitted from the mobile device;
A radio base station comprising: control means for executing either radio resource direct control or radio resource indirect control according to the determination of the combination determining means.   The combination determining means arranges the radio base stations in the order of good reception quality, sets the radio resource direct control method to the radio base station with the best reception quality, and is set by the system among the other radio base stations. 2. The radio resource indirect control method is set for up to a certain number of radio base stations satisfying reception quality, and the E-DCH connection is disconnected without setting either control method for the remaining radio base stations. The radio base station described in 1.   The radio base station according to claim 1, wherein the combination determination unit transmits a determination result to another radio base station. Measuring means for measuring reception quality according to the conditions of the report condition information received from the radio base station according to any one of claims 1 to 3,
A comparison means for comparing the reception quality measured by the measurement means with a report standard;
Report information creating means for creating information indicating the reception quality when the measurement result satisfies a report standard;
Transmitting means for transmitting information created by the report information creating means to the radio base station.   A mobile communication system comprising the radio base station according to any one of claims 1 to 3 and the mobile device according to claim 4.   The mobile communication system according to claim 5, wherein a specific radio base station is equipped with the control means among a plurality of radio base stations having an ability to perform E-DCH connection.   6. The mobile communication system according to claim 5, wherein a host device that controls each radio base station is equipped with the control means. A wireless base station combination control method in a mobile communication system employing an E-DCH (Enhanced Dedicated Channel), which is a high-speed channel dedicated to uplink transmission, on an uplink between a mobile device and each radio base station,
In the radio base station, setting a condition for causing the mobile device to report information indicating reception quality to a radio base station performing E-DCH connection;
In the radio base station, transmitting report condition information indicating the set condition to the mobile device;
In the mobile device, measuring the reception quality according to the condition of the report condition information received from the radio base station;
In the mobile device, the step of comparing the measured reception quality with a reporting standard;
In the mobile device, a step of creating information indicating the reception quality when the measurement result satisfies a report standard;
In the mobile device, transmitting the created information to the radio base station;
In the radio base station, determining an E-DCH control method for each radio base station based on information indicating reception quality transmitted from the mobile device;
A radio base station combination control method comprising: performing, in the radio base station, either radio resource direct control or radio resource indirect control in accordance with the determination of the combination.

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