WO2009093542A1

WO2009093542A1 - Communication system and method, and wireless control station and base station

Info

Publication number: WO2009093542A1
Application number: PCT/JP2009/050661
Authority: WO
Inventors: Yoshifumi Yanagisako
Original assignee: Nec Corporation
Priority date: 2008-01-24
Filing date: 2009-01-19
Publication date: 2009-07-30
Also published as: JP5359888B2; JPWO2009093542A1

Abstract

Disclosed are a method and system for avoiding the production of a throughput exceeding the capability of mobile stations and for avoiding the deterioration of service quality, by managing communication quality. A control station (20) derives the management information of the communication quality (CQI margin, CQI upper limit value/lower limit value) on the basis of the predetermined parameters (MBR, GBR, PRIORITY, or the like) from a core network (10). A base station (30) performs the allocation of the bands between the base station (30) and mobile stations (40) on the basis of the values of CQI reports from the mobile stations (40) and the management information from the control station (20).

Description

Communication system and method, radio control station and base station

(Description of related applications)
This application claims the priority of the previous Japanese Patent Application No. 2008-013761 (filed on Jan. 24, 2008), and the entire description of the previous application is incorporated herein by reference. Is considered to be.
The present invention relates to a radio communication system, and more particularly to a technique for assigning a channel between a base station and a terminal.

A radio network controller (Radio network controller; “radio control station”, simply abbreviated as “control station”) is closed between a radio base station (referred to as “base station”) and a terminal (mobile station). It is not involved in the control using the existing CQI (Channel Quality Indicator). The CQI is determined based on the reception quality of the P-CPICH (Primary Common Pilot Channel) at the mobile station and achieves BLER (Block Error Ratio) <10%. TFRI (Transport Format Resource Index: time slot allocated to the time slot. (Representing the number of codes, modulation method, and data size) is indicated by a numerical value of 1 to 30.

In this case, for example, since the CQI of the non-priority call is higher than the CQI value of the priority call, it is expected that the throughput of the priority call decreases.

In addition, since the maximum transmission rate (MBR: Maximum Bit Rate) notified from the core network is not considered on the base station side, the base station outputs a throughput exceeding the capability of the mobile station (UE: User Equipment). there is a possibility.

Furthermore, in the streaming service, there is a possibility that channel allocation lower than the guaranteed transmission rate (GBR: Guaranteed Bit Rate) is performed according to the CQI report value from the mobile station.

The base station realizes adaptive modulation and coding (AMC: Adaptive Modulation and Coding) of HSDPA (High Speed Downlink Packet Access) by selecting an appropriate TFRI using CQI (quality information) transmitted from the terminal. To do.

Note that Patent Document 1 describes that if the target SIR (signal-to-interference ratio) of the node NODEB # 1 (base station) has not been updated for a period of time preselected by the radio network control station (RNC), autonomously Discloses a configuration in which the target SIR is updated in small increments. Patent Document 2 discloses a transmission process in which information related to parameters used for adaptive modulation control is transmitted to a higher-level device side of a radio base station in a mobile communication system that performs adaptive modulation control between the mobile station and the radio base station. A mobile communication system having a configuration including a bandwidth control unit and a bandwidth control unit that performs bandwidth control using the parameter on the host device side is disclosed. Further, in Patent Document 3, in a mobile communication system that directly performs uplink radio resource control in a radio base station, uplink radio resources are efficiently allocated between radio base stations, and uplink communication quality of each mobile station is determined. A radio resource allocation method that prevents degradation and call disconnection is disclosed. In this method, the radio base station compares the total received power in the specific cell of the radio base station with the first target value designated by the radio network controller, and the total received power is the first target value. If not, the ratio between the received power from the serving mobile station that uses the specific cell as a serving cell and the received power from a non-serving mobile station that uses the specific cell as a non-serving cell is specified by the radio network controller. When the ratio is not smaller than the second target value, the uplink radio resource allocated to the non-serving mobile station is maintained without being changed. The inventions disclosed in the above-mentioned Patent Documents 1 to 3 are completely different from the present invention in configuration and operation effects, as will be apparent from the following description.

JP 2002-344384 A JP 2006-67433 A JP 2006-254426 A

The following is an analysis of related technology according to the present invention.

In related technology, since it is not involved in transmission control using CQI (Channel Quality Indicator), it is expected that the throughput of priority calls will decrease because the CQI of non-priority calls is higher than the CQI value of priority calls. Is done.

In addition, since the base station does not consider (considerate) the maximum transmission rate (MBR: Maximum Bit Rate) notified from the core network, the base station will output a throughput that exceeds the capability of the mobile station (UE: User Equipment). there is a possibility.

Furthermore, in the streaming service, there is a possibility that channel allocation lower than the guaranteed transmission rate (GBR: Guaranted Bit Rate) is performed by the CQI report value from the mobile station.

Therefore, an object of the present invention is to manage the communication quality between the base station and the terminal, thereby avoiding the base station from giving a throughput exceeding the capability of the mobile station, and avoiding deterioration of the service quality, wireless communication It is to provide a control station, a base station, and a communication method.

The invention disclosed in the present application is generally configured as follows in order to solve the above problems. According to one aspect of the present invention, a terminal (mobile station), a base station, and a radio control station are provided, and the radio control station derives management information related to communication quality of radio communication between the base station and the terminal, The base station is provided with a communication system for allocating a band between the base station and the terminal based on the management information from the radio control station.

According to the present invention, a radio control station connected to a base station that allocates a band with a terminal to be wirelessly connected, and derives management information relating to communication quality of radio communication between the base station and the terminal And a radio control station that notifies the base station of the management information.

According to the present invention, allocation of a band between a base station and the terminal is determined based on a communication quality report notified from a wirelessly connected terminal and communication quality management information derived by a wireless control station. A base station comprising means is provided.

According to the present invention, a base station that performs radio communication with a terminal, wherein management information related to communication quality of radio communication between the base station and the terminal is derived, and based on the management information, between the base station and the terminal There is provided a base station provided with means for allocating a certain band.

According to the present invention, the radio control station derives management information related to communication quality of radio communication between the base station and the terminal,
There is provided a communication method in which the base station allocates a band between the base station and the terminal based on the management information from the radio control station.

According to the present invention, the base station derives management information related to communication quality of wireless communication between the base station and the terminal, and allocates a band between the base station and the terminal based on the management information. A communication method is provided.

According to the present invention, a terminal that communicates wirelessly with a base station, reports communication quality to the base station, and is derived from the wireless control station side or the base station for wireless communication between the base station and the terminal. On the basis of management information related to communication quality and the report of the communication quality from the terminal, a terminal is provided in which a bandwidth is allocated to the base station by the base station.

According to the present invention, it is possible to avoid that the base station outputs a throughput exceeding the capability of the mobile station, and it is possible to avoid deterioration of service quality. As a result, it is possible to improve the priority call throughput and optimize channel allocation.

It is a flowchart explaining operation | movement of one Example of this invention. It is a flowchart explaining operation | movement of one Example of this invention. It is a figure explaining the effect when not applying with the case where the present invention is applied. It is a figure which shows the system configuration | structure of one Example of this invention. It is a figure which shows the system configuration | structure of one Example of this invention.

Explanation of symbols

10 Core network 20 Control station (radio control station)
21 CQI upper limit determination unit 22 CQI lower limit determination unit 23 CQI margin determination unit 30 Base station (radio base station)
40 mobile station 50 radio control unit 51 CQI upper limit determination unit 52 CQI lower limit determination unit 53 CQI margin determination unit 54 radio transmission unit

In the present invention, the radio control station provides the base station with a QoS (Quality of Service) class and a maximum transmission rate (MBR) / guaranteed transmission rate (GBR) notified from the core network. CQI margin / CQI upper limit value / lower limit value in consideration of (Rate) is notified. The base station performs channel allocation with the terminal based on the CQI margin, the CQI upper limit / lower limit value notified from the radio control station, and the CQI report value notified from the terminal (mobile station). The CQI is determined based on the reception quality of P-CPICH (Primary Common Pilot Channel) at the terminal (mobile station),
BLER (Block Error Ratio) <10%
TFRI (Transport Format Resource Index: represents the number of codes assigned to a time slot, modulation scheme, and data size) is represented by a numerical value from 1 to 30. Hereinafter, description will be made with reference to examples.

FIG. 4 is a diagram showing a system configuration of an embodiment of the present invention. Referring to FIG. 4, the communication system according to the present embodiment includes a core network 10, a radio control station (RNC: hereinafter referred to as “control station”) 20, a base station 30, and a terminal (mobile station) (UE: User). (Equipment) 40.

In the present embodiment, the control station 20 has a CQI upper limit value determination unit 21 and a CQI lower limit value as a configuration for deriving management information of communication quality (for example, downlink channel) between the base station 30 and the terminal (mobile station) 40. A determination unit 22 and a CQI margin determination unit 23 are provided.

In the present embodiment, the CQI margin determined by the CQI margin determination unit 23 of the control station 20 is notified to the base station 30.

The base station 30 uses the CQI margin notified from the control station 20 to suppress channel allocation for non-priority calls, thereby allocating many channels to priority calls and improving the priority call throughput.

Further, based on MBR and GBR notified from the core network 10 to the control station 20, the CQI upper limit value determining unit 21 and the CQI lower limit value determining unit 22 of the control station 20 respectively set the CQI upper limit value and the CQI lower limit value. Decide and notify the base station 30. As a result, in the base station 30, it is possible to suppress excessive channel allocation, and optimal channel allocation is performed.

FIG. 1 shows an embodiment of the present invention. 4 is a flowchart showing a procedure for determining a CQI margin, a CQI upper limit value, and a CQI lower limit value of the control station 20;

The determination of the CQI margin value and the determination of the CQI upper limit value are performed, for example, when a new call is established.

When establishing a new call, the control station 20 receives GBR, MBR traffic class (Traffic Class), allocation / retention (retention) / priority (Allocation / Retention Priority), traffic handling, A priority (Traffic Handling Priority) or the like is notified (step S1).

The control station 20 determines the CQI margin / CQI upper limit value / lower limit value based on these values and the capability (UE Category) of the mobile station (UE) 40.

First, the CQI margin determination unit 23 of the control station 20 determines a CQI margin based on the traffic class and priority (step S2).

Next, the CQI upper limit determining unit 21 of the control station 20 determines the CQI upper limit from the MBR (step S3).

When there is a GBR notification from the core network 10 to the control station 20 (YES branch in step S4), the CQI lower limit determination unit 22 of the control station 20 determines the CQI lower limit value by GBR (step S5).

When there is no GBR notification from the core network 10 to the control station 20 (NO branch of step S4), the CQI lower limit value determination unit 22 of the control station 20 sets the CQI lower limit value to the minimum value (step S6).

The CQI margin determining unit 23, the CQI upper limit determining unit 21, and the CQI lower limit determining unit 22 of the control station 20 notify the base station 30 of the determined CQI margin, CQI upper limit, and CQI lower limit.

Hereinafter, a method of determining the CQI upper limit value, the CQI lower limit value, and the CQI margin in the control station 20 will be described.

<Determination of CQI upper limit value>
The control station 20 determines the CQI upper limit value in the CQI upper limit determination unit 21 based on the MBR notified from the core network 10. Table 1 below shows an example of a table that maps the MBR to the CQI upper limit value. Number of HS-PDSCH in Table 1 represents the number of codes (number of channel codes) used for HS-PDSCH (High Speed Physical Down Link) transmission. The mapping table of Table 1 is held in the CQI upper limit determination unit 21.

When the MBR notified from the core network 10 is, for example, 1 Mbps (megabits / second), the CQI upper limit value determination unit 21 of the control station 20 refers to the mapping table (Table 1) between the CQI upper limit value and the MBR, The CQI upper limit value is determined to be “14”. In the table of Table 1, since the bit rate of 1 Mbps exists between the CQI values “12” and “14”, the CQI upper limit value may be determined as “12”.

In this embodiment, a mapping table is prepared for each capability of a mobile station called a UE category (UE Category). The UE category is notified from the mobile station 40 to the control station 20 via the base station 20 at the time of call establishment.

<Determination of CQI lower limit value>
When the GBR is notified from the core network 10, the CQI lower limit determining unit 22 of the control station 20 determines the CQI lower limit using the mapping table of Table 1 in the same manner as the CQI upper limit.

For example, when the GBR is 0.5 Mbps, the CQI lower limit value is set to “9”. If the GBR is not reported from the core network 10, the CQI lower limit value is set to the minimum value. Note that the CQI lower limit determination process may be performed by the base station 30 instead of the control station 20. The base station 30 may be notified of the GBR from the control station 20, and in this case, the base station 30 can determine the CQI lower limit value.

<Determination of CQI margin>
The CQI margin determination unit 23 of the control station 20 determines a CQI margin based on a traffic class (Traffic Class) that is a QoS class notified from the core network 10.

Table 2 below shows an example of a mapping table of traffic classes and CQI margins. As shown in Table 2, the QoS class is divided into four traffic classes: a Conversational class, a Streaming class, an Interactive class, and a Background class. The Conversational and Streaming classes are real-time traffic, and the Interactive and Background classes are non-real-time traffic. The CQI margins are 0, 2, 4, and 8 for each traffic class.

When the traffic class notified from the core network 10 is, for example, interactive, the CQI margin determination unit 23 of the control station 20 determines the CQI margin as “4”.

In this example, the CQI margin determination unit 23 of the control station 20 considers only the traffic class, but uses allocation / retention priority, traffic handling priority, and the like. Detailed assignment control may be performed. The allocation / retention priority can be differentiated from “0” to “15”, and the traffic handling priority can be differentiated from “0” to “15”. Note that a negative number may be set for the CQI margin.

The CQI margin determination process may be performed by the base station 30 instead of the control station 20.

Since the base station 30 receives notification of scheduling priority and allocation / retention priority from the control station 20, it is possible to determine the CQI margin in consideration of these values.

However, when the base station 30 performs CQI margin determination processing, a scheduling priority indicator is used instead of the traffic handling priority.

As described above, the control station 20 determines the CQI margin and the CQI upper limit value / lower limit value and notifies the base station 30 of them.

FIG. 2 is a flowchart showing a procedure for determining a CQI value in the base station 30. The determination of the CQI value in the base station 30 will be described below with reference to FIGS.

The base station 30 is notified of the CQI from the mobile station 40 (step S11).

When receiving the CQI notification from the mobile station 40 (YES in step S12), the base station 30 receives the CQI margin and CQI upper limit value notified from the control station 20, and the CQI report value notified from the mobile station 40. Using this, the actual CQI of the mobile station 40 is determined, for example, as shown in equation (1) (step S13).

CQI = Median (CQI upper limit, (CQI report value-CQI margin), CQI lower limit) (1)

In the above equation (1), Median is the median value. The CQI determined by the above equation (1) is input to a scheduler (not shown; performing scheduling control of radio transmission such as channel allocation) of the base station 30 (step S14).

For example,
When “(CQI report value−CQI margin)> CQI upper limit value” is satisfied, a throughput (MBR) exceeding the capability of the mobile station 40 is normally output. In this embodiment, the introduction of the CQI upper limit value is introduced. Thus, the throughput of the base station 30 can be suppressed below the capability of the mobile station 40. In other words, the CQI upper limit value notified from the control station 20 to the base station 30 prevents the transmission rate from the base station 30 from exceeding the capability of the mobile station 40 in the scheduler of the base station 30.

Also, when “(CQI report value−CQI margin) <CQI lower limit value” is satisfied, the throughput falls below the service quality to be guaranteed. However, according to the present embodiment, it is possible to suppress degradation in service quality due to the CQI lower limit value.

Further, it is assumed that mobile station # 1 (see FIG. 4) is conducting a conversation as a traffic class and mobile station # 2 (see FIG. 4) is performing a background (background).

At this time, when the CQI report value of the mobile station # 1 is “12” and the CQI report value of the mobile station # 2 is “14”, it is normal (that is, when the present invention is not applied), the map in Table 1 From the table
Assign 3 codes to mobile station # 1
Four codes are assigned to mobile station # 2.

On the other hand, according to the present invention, by introducing the CQI margin, from Table 2, the CQI margin of traffic class “Conversational” is “0” and the CQI margin of traffic class “Background” is “8”. "
Mobile station # 1: CQI report value (= 12) −CQI margin (= 0) = 12.
Mobile station # 2: CQI report value (= 14) −CQI margin (= 8) = 6
And
Mobile station # 1 has 3 codes corresponding to CQI = 12,
One code corresponding to CQI = 6 is assigned to mobile station # 2. That is, a channel can be preferentially assigned to the mobile station # 1.

FIG. 3 is a diagram showing a comparison between a case where the present invention is applied and a comparative example where the present invention is not applied. In FIG. 3, the broken line indicates the time change of the CQI value notified from the mobile station. The solid line indicates the CQI value used in the scheduler of the base station 30 when the CQI upper limit value and the CQI lower limit value are used according to the present invention.

As shown in FIG. 3, when the CQI report value exceeds the CQI upper limit value, if the present invention is not applied, the scheduler of the base station tries to allocate channel resources equal to or higher than the MBR notified from the core network. (Refer to the broken line exceeding the CQI upper limit value in FIG. 3).

On the other hand, in this embodiment, by setting the CQI upper limit value, it is possible to operate so as not to allocate extra channel resources.

If the present invention is not applied and the CQI report value falls below the CQI lower limit value, the base station scheduler allocates only channel resources equal to or lower than the GBR notified from the core network (the CQI lower limit value in FIG. 3). (See dashed line below).

On the other hand, according to the present embodiment, by setting the CQI lower limit value, it is possible to operate so as to allocate channel resources sufficient to maintain the minimum service quality.

As described above, the present embodiment provides the following operational effects.

According to the present embodiment, since the upper limit of CQI is provided in consideration of MBR, the base station does not output a transmission rate exceeding the capability of the mobile station (UE).

According to the present embodiment, since the lower limit of CQI is provided in consideration of GBR, it is possible to prevent deterioration in service quality.

According to the present embodiment, since the CQI value is changed in consideration of QoS (Quality of Service) such as a traffic class (Traffic Class) and a priority (Priority), it is possible to differentiate services. .

Furthermore, according to the present embodiment, in LTE (Long Term Evolution) standardized by 3GPP, since the control station and the base station are integrated, all the above information (MBR / GBR / Priority) It is possible to know at the base station. Therefore, as shown in FIG. 5, the CQI upper limit determination unit 51, the CQI lower limit determination unit 52, and the CQI margin determination unit 53 may be provided in the radio control unit 50 on the base station 30 (eNodeB) side.

In LTE, unlike the existing W-CDMA HSDPA (High Speed Down Packet Access) method, throughput is improved by dynamically allocating the number of subcarriers to mobile stations.

By replacing the above channels with subcarriers, it is possible to limit the number of subcarriers to be allocated in consideration of MBR / GBR / Priority (priority order).

The upper and lower limits of the subcarrier allocation number are determined by the CQI upper limit value and the CQI lower limit value, and the subcarrier allocation number is differentiated according to the priority order by the CQI margin.

In addition, in HSPA Evolution, which is being studied in 3GPP in parallel with LTE, the access method adopts the CDMA method as before, but it is assumed that the control station and the base station are integrated. In this case, MBR / GBR / Priority can be known only by the base station as in LTE. In this case, as shown in FIG. 5, a CQI upper limit determination unit 51, a CQI lower limit determination unit 52, and a CQI margin determination unit 53 are provided in the radio control unit 50 of the base station 30, and the scheduler (non- In the figure, the number of channels is allocated.

The above-described embodiments are as follows.

[1] The communication system according to the embodiment includes a terminal, a base station that performs radio communication with the terminal, and radio control that derives management information related to communication quality of radio communication between the base station and the terminal and notifies the base station And the base station allocates a band between the base station and the terminal based on the management information from the radio control station.

[2] In the communication system according to [1], the base station determines a bandwidth between the base station and the terminal based on a communication quality report notified from the terminal and the management information from the radio control station. Determine the assignment of.

[3] In the communication system according to [1] or [2], the radio control station derives the management information related to the communication quality based on a predetermined parameter from a core network.

[4] In the communication system according to any one of [1] to [3], the radio control station performs at least one of QoS (Quality of Service) information, maximum transmission rate (MBR), and guaranteed transmission rate (GBR). Based on one parameter, as the management information of the communication quality, determine at least one value corresponding to the parameter among the margin of the communication quality, the upper limit value of the communication quality, the lower limit value of the communication quality, Notify the base station.

[5] In the communication system of [4], when there is a notification of the guaranteed transmission rate (GBR), the radio control station determines a lower limit value of the communication quality based on the guaranteed transmission rate (GBR), If there is no notification of the guaranteed transmission rate (GBR), the lower limit value is set to a predetermined minimum value.

[6] In the communication system according to any one of [1] to [5], the radio control station corresponds to a category corresponding to the capability of the terminal, the upper limit value, the lower limit value, and the transmission speed of the communication quality. A table that defines the correspondence relationship is provided.

[7] In any one of the communication systems [1] to [6], the radio control station includes a table that defines a correspondence relationship between a QoS class and a margin of the communication quality.

[8] In any one of the communication systems [1] to [3], the base station derives a margin of the communication quality from the communication quality management information based on QoS (Quality of Service) information. To do.

[9] In any one communication system of [1] to [8], the communication quality includes CQI (Channel Quality Indicator).

[10] In the communication system according to [9], the base station uses at least one of a CQI margin, a CQI upper limit value, and a CQI lower limit value notified from the radio control station, and a CQI report value from the terminal. To determine the CQI.

[11] A communication system according to an embodiment includes a terminal and a base station, and the base station derives management information regarding communication quality of wireless communication between the base station and the terminal, and is notified from the terminal. Based on the quality report and the management information, a bandwidth is allocated between the base station and the terminal.

[12] In the communication system of [11], the communication quality includes a CQI (Channel Quality Indicator).

[13] In the communication system according to [11] or [12], the base station acquires communication quality related to wireless communication between the base station and the terminal from the terminal, and QoS (Quality of Service) from the core network. ), At least one of the CQI margin, the CQI upper limit value, and the CQI lower limit value corresponding to the parameter as the communication quality management information based on at least one parameter of the maximum transmission rate (MBR) and the guaranteed transmission rate (GBR). A wireless control unit for determining one value is provided.

[14] In any one communication system of [4], [7], [8], and [13], the QoS information includes traffic class information and / or priority information.

[15] The radio control station according to the embodiment is a radio control station that is connected to a base station that allocates a band with a terminal that is connected wirelessly, and relates to communication quality of radio communication between the base station and the terminal. Means for deriving management information is provided, and the management information is notified to the base station.

[16] The radio control station of [15] derives management information related to the communication quality based on predetermined parameters from the core network.

[17] The radio control station of [15] or [16] is configured to manage the communication quality based on at least one parameter of QoS (Quality of Service), maximum transmission rate (MBR), and guaranteed transmission rate (GBR). And determining at least one value corresponding to the parameter from the margin of communication quality, the upper limit value of the communication quality, and the lower limit value of the communication quality, and notifying the base station.

[18] When there is a notification of the guaranteed transmission rate (GBR), the radio control station of [17] determines the lower limit value of the communication quality based on the guaranteed transmission rate (GBR), and the guaranteed transmission rate (GBR) When there is no notification, the lower limit value is set to a predetermined minimum value.

[19] In any one radio control station of [15] to [18], the communication quality includes CQI (Channel Quality Indicator).

[20] In the radio control station of [17], the QoS information includes traffic class information and / or priority information.

[21] The base station according to the embodiment determines the bandwidth between the base station and the terminal based on the communication quality report notified from the wirelessly connected terminal and the communication quality management information derived by the wireless control station. Means for determining allocation are provided.

[22] The base station of the embodiment is a base station that performs radio communication with a terminal, and derives management information related to communication quality of radio communication between the base station and the terminal, and based on the management information, the base station And means for allocating bandwidth between the terminals.

[23] The base station of [21] or [22] uses the quality of service (QoS), maximum transmission rate (MBR), and guaranteed transmission rate (GBR) parameters as the communication quality management information. Determining at least one value corresponding to the parameter among the margin of communication quality, the upper limit value of the communication quality, and the lower limit value of the communication quality and notifying the base station

[24] In the base station of [23], the QoS information includes traffic class information and / or priority information.

[25] In the communication method of the embodiment, the radio control station derives management information related to communication quality of radio communication between the base station and the terminal,
The base station allocates a band between the base station and the terminal based on the management information from the radio control station.

[26] [25] In the communication method, the base station allocates a bandwidth between the base station and the terminal based on the communication quality report notified from the terminal and the management information from the radio control station. To decide.

[27] In the communication method of [25] or [26], the radio control station derives management information related to the communication quality based on a predetermined parameter from a core network.

[28] In any one communication method of [25] to [26], the radio control station performs at least one of QoS (Quality of Service) information, maximum transmission rate (MBR), and guaranteed transmission rate (GBR). Based on one parameter, as the management information of the communication quality, determine at least one value corresponding to the parameter among the margin of the communication quality, the upper limit value of the communication quality, the lower limit value of the communication quality, Notify the base station.

[29] In the communication method of [28], when there is a notification of the guaranteed transmission rate (GBR), the radio control station determines a lower limit value of the communication quality based on the guaranteed transmission rate (GBR),
If there is no notification of the guaranteed transmission rate (GBR), the lower limit value is set to a predetermined minimum value.

[30] In the communication method according to any one of [25] to [29], the communication quality includes CQI (Channel Quality Indicator).

[31] In the communication method of [30], when the base station receives a CQI report from the terminal, at least one of a CQI margin, a CQI upper limit value, and a CQI lower limit value notified from the radio control station, The CQI is determined using the CQI report value from the terminal.

[32] In the communication method of the embodiment, the base station derives management information related to communication quality of wireless communication between the base station and the terminal, and based on the management information, a band between the base station and the terminal. Assigns.

[33] In the communication method of [32], the base station obtains a CQI (Channel Quality Indicator) report as the communication quality from the terminal, and the QoS (Quality of Service), maximum transmission speed from the core network. Based on at least one parameter of (MBR) and guaranteed transmission rate (GBR), at least one value corresponding to the parameter among CQI margin, CQI upper limit value, and CQI lower limit value is determined as the communication quality management information. .

[34] In the communication method of [28] or [33], the QoS information includes traffic class information and / or priority information.

[35] A terminal according to an embodiment is a terminal that performs radio communication with a base station, reports communication quality to the base station, and is derived between the base station and the terminal, which is derived from a radio control station side or the base station. Based on the management information related to the communication quality of wireless communication and the report of the communication quality from the terminal, the base station allocates a band with the base station.

The disclosures of

Patent Documents

1, 2, and 3 above are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

Claims

A terminal,
A base station in wireless communication with the terminal;
A radio control station for deriving management information related to communication quality of radio communication between the base station and the terminal and notifying the base station;
The base station allocates a band between the base station and the terminal based on the management information from the radio control station.
The base station determines allocation of a band between the base station and the terminal based on a communication quality report notified from the terminal and the management information from the radio control station. The communication system according to claim 1.
The communication system according to claim 1 or 2, wherein the radio control station derives the management information related to the communication quality based on a predetermined parameter from a core network.
The radio control station uses the communication quality of the communication quality as the management information of the communication quality based on at least one parameter of QoS (Quality of Service) information, maximum transmission rate (MBR), and guaranteed transmission rate (GBR). 4. At least one value corresponding to the parameter among a margin, an upper limit value of the communication quality, and a lower limit value of the communication quality is determined and notified to the base station. The communication system according to item 1.
When there is a notification of the guaranteed transmission rate (GBR), the radio control station determines a lower limit value of the communication quality based on the guaranteed transmission rate (GBR), and there is no notification of the guaranteed transmission rate (GBR) 5. The communication system according to claim 4, wherein the lower limit value is set to a predetermined minimum value.
The radio control station includes a table that defines a correspondence relationship between an upper limit value, a lower limit value, and a transmission rate of the communication quality in association with a category corresponding to the capability of the terminal. The communication system according to any one of 1 to 5.
The communication system according to any one of claims 1 to 6, wherein the radio control station includes a table that defines a correspondence relationship between a QoS class and a margin of the communication quality.
4. The base station according to claim 1, wherein the base station derives a margin of the communication quality from the communication quality management information based on QoS (Quality of Service) information. 5. Communication system.
The communication system according to any one of claims 1 to 8, wherein the communication quality includes CQI (Channel Quality Indicator).
The base station determines a CQI using at least one of a CQI margin, a CQI upper limit value, a CQI lower limit value notified from the radio control station, and a CQI report value from the terminal. The communication system according to claim 9.
A terminal and a base station,
The base station derives management information related to communication quality of wireless communication between the base station and the terminal, and based on the communication quality report notified from the terminal and the management information, between the base station and the terminal A communication system characterized by allocating a bandwidth.
The communication system according to claim 11, wherein the communication quality includes CQI (Channel Quality Indicator).
The base station acquires communication quality related to wireless communication between the base station and the terminal from the terminal, and QoS (Quality of Service), maximum transmission rate (MBR), guaranteed transmission rate (GBR) from the core network A radio control unit that determines at least one value corresponding to the parameter among CQI margin, CQI upper limit value, and CQI lower limit value as the communication quality management information based on at least one parameter of The communication system according to claim 12, characterized in that:
The communication system according to any one of claims 4, 7, 8, and 13, wherein the QoS information includes traffic class information and / or priority information.
A radio control station connected to a base station that allocates a band with a terminal to be wirelessly connected,
A radio control station comprising means for deriving management information related to communication quality of radio communication between the base station and the terminal, and notifying the management information to the base station.
The radio control station according to claim 15, wherein management information related to the communication quality is derived based on predetermined parameters from a core network.
Based on at least one parameter of QoS (Quality of Service), Maximum Transmission Rate (MBR), Guaranteed Transmission Rate (GBR), the communication quality management information includes the communication quality margin, the communication quality upper limit value, the communication quality The radio control station according to claim 15 or 16, wherein at least one value corresponding to the parameter among lower limit values of communication quality is determined and notified to the base station.
When the guaranteed transmission rate (GBR) is notified, the lower limit value of the communication quality is determined based on the guaranteed transmission rate (GBR). When the guaranteed transmission rate (GBR) is not notified, the lower limit value is determined in advance. The radio control station according to claim 17, wherein the radio control station is set to a set minimum value.
The radio control station according to any one of claims 15 to 18, wherein the communication quality includes CQI (Channel Quality Indicator).
The radio control station according to claim 17, wherein the QoS information includes traffic class information and / or priority information.
Based on the communication quality report notified from the wirelessly connected terminal and the communication quality management information derived by the wireless control station, a means for determining allocation of a band between the base station and the terminal is provided. A base station characterized by that.
A base station that performs radio communication with a terminal, and derives management information related to communication quality of radio communication between the base station and the terminal, and allocates a band between the base station and the terminal based on the management information A base station characterized by comprising means.
Based on at least one parameter of QoS (Quality of Service), Maximum Transmission Rate (MBR), Guaranteed Transmission Rate (GBR), the communication quality management information includes the communication quality margin, the communication quality upper limit value, the communication quality 23. The base station according to claim 21 or 22, wherein at least one value corresponding to the parameter among lower limit values of communication quality is determined and notified to the base station.
The base station according to claim 23, wherein the QoS information includes traffic class information and / or priority information.
The radio control station derives management information related to the communication quality of the radio communication between the base station and the terminal,
The communication method, wherein the base station assigns a band between the base station and the terminal based on the management information from the radio control station.
The base station determines allocation of a band between the base station and the terminal based on a communication quality report notified from the terminal and the management information from the radio control station. Item 26. The communication method according to Item 25.
27. The communication method according to claim 25 or 26, wherein the radio control station derives management information related to the communication quality based on a predetermined parameter from a core network.
The radio control station uses the communication quality of the communication quality as the management information of the communication quality based on at least one parameter of QoS (Quality of Service) information, maximum transmission rate (MBR), and guaranteed transmission rate (GBR). 28. At least one value corresponding to the parameter among a margin, an upper limit value of the communication quality, and a lower limit value of the communication quality is determined and notified to the base station. The communication method according to Item 1.
When there is a notification of the guaranteed transmission rate (GBR), the radio control station determines a lower limit value of the communication quality based on the guaranteed transmission rate (GBR),
29. The communication method according to claim 28, wherein, when there is no notification of the guaranteed transmission rate (GBR), the lower limit value is set to a predetermined minimum value.
30. The communication method according to claim 25, wherein the communication quality includes CQI (Channel Quality Indicator).
When the base station receives a CQI report from the terminal, the base station uses at least one of a CQI margin, a CQI upper limit value, and a CQI lower limit value notified from the radio control station, and a CQI report value from the terminal. The communication method according to claim 30, wherein the CQI is determined.
A base station derives management information related to communication quality of wireless communication between the base station and the terminal, and performs bandwidth allocation between the base station and the terminal based on the management information Method.
The base station obtains a CQI (Channel Quality Indicator) report as the communication quality from the terminal, and receives QoS (Quality of Service), maximum transmission rate (MBR), guaranteed transmission rate (GBR) from the core network. 33. The communication quality management information based on at least one parameter, wherein at least one value corresponding to the parameter among a CQI margin, a CQI upper limit value, and a CQI lower limit value is determined. Communication method.
The communication method according to claim 28 or 33, wherein the QoS information includes traffic class information and / or priority information.
A terminal wirelessly communicating with a base station,
Report communication quality to the base station,
Based on management information related to communication quality of wireless communication between the base station and the terminal, derived from the radio control station side or the base station, and the communication quality report from the terminal, the base station allows the A terminal characterized in that a bandwidth is allocated to a base station.
In radio control station or base station
A channel quality indication CQI (Channel Quality Indicator) margin corresponding to a traffic class or priority obtained by classifying QoS (Quality of Service) information is obtained.
From the CQI report value and CQI margin reported from the mobile station,
CQI report value-CQI margin
A communication system, characterized in that a channel code number corresponding to a CQI report value-CQI margin value is obtained as the number of channel codes allocated for downlink transmission from the base station to the mobile station.
In the radio control station or base station,
When the CQI report value-CQI margin exceeds a predetermined CQI upper limit value or falls below a predetermined CQI lower limit value,
The communication system according to claim 36, wherein the scheduler of the base station uses the CQI upper limit value or the CQI lower limit value.
In the radio control station or base station,
A first table defining the correspondence between CQI values and transmission rates;
Referring to the first table, a CQI value corresponding to the maximum transmission rate (MBR) notified from the core network side is obtained, and set as a CQI upper limit value,
Referring to the first table, when a CQI value corresponding to the guaranteed transmission rate (GBR) notified from the core network side is obtained as a CQ lower limit value, and the guaranteed transmission rate is not notified from the core network side, 38. The communication system according to claim 37, wherein a minimum value of CQI is set as a CQI lower limit value.
In the radio control station or base station,
A second table defining the correspondence between traffic classes and CQI margins;
38. The communication system according to claim 36 or 37, wherein a CQI margin corresponding to the traffic class notified from the core network side is obtained by referring to the second table.
The said 1st table hold | maintains the number of channel codes allocated to the downlink transmission from the said base station to the said mobile station corresponding to the value of CQI, and a transmission rate. Communications system.
In radio control station or base station
A channel quality indication CQI (Channel Quality Indicator) margin corresponding to a traffic class or priority obtained by classifying QoS (Quality of Service) information is obtained.
From the CQI report value and CQI margin reported from the mobile station,
CQI report value-CQI margin
A communication method characterized in that a channel code number corresponding to a CQI report value-CQI margin value is obtained as the number of channel codes allocated for downlink transmission from the base station to the mobile station.
In the radio control station or base station,
When the CQI report value-CQI margin exceeds a predetermined CQI upper limit value or falls below a predetermined CQI lower limit value,
The communication method according to claim 41, wherein the scheduler of the base station uses the CQI upper limit value or the CQI lower limit value.
In the radio control station or base station,
With reference to the first table that defines the correspondence between the CQI value and the transmission rate, the CQI value corresponding to the maximum transmission rate (MBR) notified from the core network side is obtained as the CQI upper limit value,
Referring to the first table, when a CQI value corresponding to the guaranteed transmission rate (GBR) notified from the core network side is obtained as a CQ lower limit value, and the guaranteed transmission rate is not notified from the core network side, 43. The communication method according to claim 42, wherein a minimum value of CQI is set as a CQI lower limit value.
In the radio control station or base station,
43. The CQI margin corresponding to the traffic class notified from the core network side is obtained with reference to a second table that defines the correspondence between the traffic class and the CQI margin. Communication method.
The said 1st table hold | maintains the number of channel codes allocated to the downlink transmission from the said base station to the said mobile station corresponding to the value of CQI, and a transmission rate. Communication method.