KR100630046B1 - Method for radio channel quality reporting in mobile telecommunication system - Google Patents

Abstract

The mobile communication system includes a base station, a plurality of terminals existing in the service area of the base station and receiving communication service from the base station, and a base station controller controlling the operation of the base station. The base station then reports radio channel quality to the base station controller. At this time, the base station determines the radio channel quality information indicating the quality of the radio channel between each base station and the terminals. Thus, the base station transmits radio channel quality information between each terminal and the base station to the base station controller through a frame protocol to report the quality. Then, the base station controller receiving the radio channel quality information determines the radio channel quality state.

RNC, Node B, SIR, Frame Protocol, Radio Channel Quality Reporting

Description

METHOOD FOR RADIO CHANNEL QUALITY REPORTING IN MOBILE TELECOMMUNICATION SYSTEM}             

1 is a view schematically showing the configuration of a conventional W-CDMA system

2 illustrates a structure of a frame protocol frame according to an embodiment of the present invention.

The present invention relates to a method for reporting radio channel quality in a mobile communication system, and more particularly, to a method for reporting radio channel quality using a frame protocol.

In general, a mobile communication system communicates by exchanging quality information on a channel or channels between a mobile station and a mobile station, a base station and a base station, and a mobile switching center. An asynchronous wideband-code division multiple access (W-CDMA) scheme of the mobile communication system will be described below.

1 is a view schematically showing the configuration of a conventional W-CDMA system.

First, the W-CDMA communication system includes a core network (hereinafter referred to as "CN") 100 and a plurality of radio network subsystems (hereinafter referred to as "RNS") 110. , 120, and a terminal (UE: User Element, hereinafter referred to as "UE") 130. The RNS 110 and the RNS 120 are composed of a Radio Network Controller (hereinafter referred to as "RNC") and a plurality of base stations (Node B (hereinafter referred to as "Node B")). .

For example, the RNS 110 is composed of an RNC 111 and a plurality of Node Bs 113 and 115. The RNCs are classified into Serving RNCs (hereinafter referred to as "SRNC"), Drift RNCs (hereinafter referred to as "DRNC"), or Controlling RNCs (hereinafter referred to as "CRNC") according to their roles. The SRNC and the DRNC have their functions defined according to each UE, and the RNC which manages the information of the UE and is responsible for data transmission with the CN is called the SRNC of the UE, and the data of the UE is not the corresponding SRNC of the UE. When the RNC is transmitted and received through the other RNC to the corresponding SRNC, the RNC other than the corresponding SRNC is called a DRNC of the UE. The RNC controlling each of the Node Bs is called a CRNC of each Node B. In FIG. 1, when the RNC 111 manages information of the UE 130, the RNC 111 becomes an SRNC of the UE 130, and the UE 130 moves to store data of the UE 130. When the RNC 121 is transmitted and received through the RNC 121, the RNC 121 becomes a DRNC. The RNC 111 controlling the Node B 113 becomes the CRNC of the Node B 113.

When the UE and the Node B communicate, the UE transmits user information and control information through an air interface of a physical channel. In this case, the transmitted user information and control information are defined by characteristics such as a unique carrier frequency, a scrambling code, a channelization code, and a phase. In addition, the user information and control information transmitted from the UE to the Node B through the air interface are uplink sections transmitted to the Node B when the UE is divided according to the transmission direction of the data. The uplink channel is composed of a dedicated channel and a shared channel depending on whether the channel is dedicated. In consideration of the uplink dedicated physical channel, the uplink dedicated physical channel is generated in the data transmission channel of the DPDCH (hereinafter referred to as DPDCH) and the physical layer of the dedicated physical control channel (DPCCH). Control information transmission channel. When the RNC needs data information on a transport channel from the Node B, the Node B receives data from the UE through a DPDCH. Signaling messages are transmitted through the DPCCH, which includes pilot bit pattern information, downlink power control information, feedback information (FBI), and transport format combination indicator (TFCI) information. When the UE transmits a user data and a control related signaling message using DPDCH and DPCCH to the Node B, the Node B transmits it to the RNC.

Radio resource management between the RNC and the Node B uses a Node B Application Part (hereinafter referred to as NBAP) message. The NBAP message performs functions such as a common channel establishment procedure, a cell resource management procedure, a measurement procedure, and the like. The role of the NBAP message that performs the above procedures mainly functions to perform procedures such as setting up, resetting, and releasing a radio channel.

 Among the functions, the measurement procedure in Node B of the NBAP message is divided into a common measurement procedure and a dedicated measurement procedure. Among them, the Dedicated Measurement procedure performs uplink transmission measurements. In this case, there is no problem in obtaining measurement information at a specific time for communication between a designated UE and a designated Node B in radio quality measurement. However, if there is an RNC to grasp the overall situation of the cell, signaling messages are increased between the RNC requiring the cell information and the Node B transmitting the cell information in the interval. The signaling messages are transmitted in an NBAP message, and there is a problem in that an overload for transmitting signaling messages occurs between the RNC and the Node B.

Accordingly, an object of the present invention is to provide a method for reporting radio channel quality using a frame protocol in a mobile communication system.

The present invention for achieving the above object; In a mobile communication system, a base station, a plurality of terminals existing in a service area of the base station and receiving communication service from the base station, and a base station controller for controlling the operation of the base station, the base station is a wireless channel to the base station controller A quality reporting method, comprising: determining radio channel quality information indicating a quality of a radio channel between each of a base station and terminals, and transmitting radio channel quality information of each of the determined terminals to a wireless network controller through a frame protocol; Transmitting, and the base station controller receiving the radio channel quality information comprises the step of identifying the state of the radio channel quality.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.
The present invention uses a frame protocol (hereinafter referred to as "FP") to transmit data from a base station (Node B (hereinafter referred to as "Node B") to a Radio Network Controller (hereinafter referred to as "RNC")). And transmit the control information. Also, data and control information may be transmitted and received through an interface between a plurality of RNCs.
The FP performs transmission of data and control information according to a transmission time interval (hereinafter, referred to as a "TTI") of Rel5, where the TTI may vary depending on an implementation method. For example, in order to transmit data and control information using FP from Node B to RNC, transmission is performed once every 10 ms.
As such, the FP generates an FP protocol data unit (FP PDU) in the transport layer of the Node B or the RNC and delivers the generated FP PDU.
Hereinafter, the structure of the FR frame will be described in detail.

2 is a diagram illustrating a structure of a frame protocol frame according to an embodiment of the present invention.

Referring to FIG. 2, the size of one block is composed of 8 bits, that is, 1 byte in the FR frame structure.

The FP includes a header part and a payload part.

Hereinafter, the configuration of the header portion will be described. The header part is a header cyclic redundancy check (hereinafter referred to as "Header CRC") that performs error detection at a transceiver by adding a frame check sequence (FCS) or an error detection code corresponding to the header part. It is included). The frame type (hereinafter referred to as "FT") is located after the Header CRC and distinguishes whether the FP frame is a data frame or a control frame.
Bit value 0 is transmitted when the FP frame is a data frame, and bit value 1 is transmitted when the FP frame is a control frame for synchronizing an up-down link between the Node B and the RNC. do. Next, a control frame number (hereinafter referred to as "CFN") indicates a posterior relationship between frames received on a wireless channel and assigns a frame number by converting a decimal number between 0 and 255 into a binary number. In addition, a transport format indicator (hereinafter referred to as "TFI") of a dedicated channel (hereinafter referred to as "DCH") may set a local number of 0 to 31 for a transport format. Decimal number is indicated by binary number. There is also a reserved bit area in front of the TFI. Therefore, the bit area is called a spare area, and the spare area is an area that can be used later for other purposes. The Header CRC, FT, CFN, TFI, and Spare areas form the header part.

The payload portion will be described below. In the payload portion, a transport block (hereinafter referred to as "TB") corresponding to a DCH is transmitted. The TB is a data block transmitted through an air interface and is configured with a pad section consisting of bits that align the bytes of the TB. The data transmission area composed of the TBs and the pads has a variable size according to the size of the data. There is a QE (Quality Estimate) region having a bit error rate (hereinafter, referred to as "BER") value of a physical channel or a transport channel. Next, in the CRC indicator (CRCI: CRCI indicator) region of TBs for the DCH, the CRC check result for the TB received through the interface is displayed.
In the CRCI, if the bit value is displayed as 0, it is correct. If the bit value is displayed as 1, it is Not Correct, and there is a pad area in the CRCI area that plays the same role as the TB area. In the spare extension area (hereinafter referred to as "Spare Extension"), there is a surplus area into which a new information element (hereinafter referred to as "IE") can enter. In the present invention, the information on the radio channel is transmitted by using a spare extension area which is not used in the related art. A description of the spare extension region in which the information on the wireless channel is carried will be described below. Next to the Spare Extension area is a Payload Checksum area, where Payload Checksum means Payload CRC. This is an area assigned with a CRC code that performs error detection of the payload part.

Hereinafter, a method of transmitting a radio quality state between the Node B and the UE from the Node B to the RNC by using the Spare Extension region of the FP frame will be described.

In the Node B, the current transmit code power (hereinafter referred to as Tx Code Power) information to the UE and a signal to interference ratio (hereinafter referred to as SIR) received by the Node B are referred to as a Spare. Transmit to RNC through extension area. With the Tx Code Power and SIR, the RNC measures the radio channel quality. In this case, the Tx Code Power is information measuring the output power transmitted by the Node B to a specific UE, and the SIR is the SIR received by the Node B from the specific UE. The SIR represents the ratio of the required signal power to the total power of the interference signal and the noise in decibels (dB) and is evaluated by specific conditions at specific points of the transmission channel.
The spare extension area has existed as an area within a FP frame into which new IEs can enter. Therefore, the additional message load does not occur at all by using the spare extension area. At this time, when a call between RNC and Node B is established, Node B transmits Tx Code Power information from Node B to UE and SIR value received from Node B to RNC. When the Tx Code Power information and the SIR value received by the Node B are transmitted using the FP frame, the RNC can perform quality measurements on the radio channel in real time with the values.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

In the present invention as described above, since the Tx Code Power and SIR values are transmitted in the Spare Extension region of the FP frame in the mobile communication system for reporting radio quality, a separate message for radio channel quality reporting is not required. In addition, since the radio channel quality is reported using the FP frame, there is no need for periodic message transmission, and thus no additional message load is generated. In order to grasp the overall radio quality of a cell in a rapidly changing radio channel environment, the RNC receives the necessary radio channel quality information in real time on a frame-by-frame basis through an FP frame. Therefore, it is possible to determine the state of the radio channel quality without generating a message load between the separate RNC and Node B sections.

As a result, if the situation on the radio channel quality is identified in real time using the radio quality reporting method, the radio channel quality measurement result may be used for RRM (Radio Resource Management). In addition, the wireless quality status can be identified for each link or service for the entire cell. In addition, it is possible to use an efficient radio resource management algorithm using the radio quality measurement reporting method, thereby increasing the capacity of the system and improving service quality.

Claims (6)

In a mobile communication system having a base station, a plurality of terminals existing in the service area of the base station and receiving communication service from the base station, and a wireless network controller for controlling the operation of the base station, the radio channel quality report of the base station In the method, Determining radio channel quality information including a signal-to-interference ratio between the base station and terminals and a transmission code power applied to each of the terminals; And reporting the radio channel quality information of each of the terminals in a preliminary extended area in which data of a frame protocol frame is not transmitted to the wireless network controller. Way. delete delete In a mobile communication system comprising a base station, a plurality of terminals in the service area of the base station to receive a communication service from the base station, and a wireless network controller for controlling the operation of the base station, , The base station transmits, to the radio network controller, radio channel quality information including signal-to-interference ratio between the base station and terminals and transmission code power applied to each of the terminals to a spare extended area in which data of a frame protocol frame is not transmitted. Including sending, The wireless network controller receiving the radio channel quality information includes determining a radio channel quality state between each of the base station and terminals. delete delete

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