KR101015653B1 - Method for reporting channel whether in a communication system using high speed downlink packet access scheme - Google Patents

Abstract

In the present invention, in order to efficiently perform High Speed Downlink Packet Access (hereinafter referred to as "HSDPA") communication, terminals that cannot perform normal HSDPA communication report the fact to the base station, It is to provide a method for not allocating radio resources to the terminal. In the present invention, a method for notifying a base station of a communication situation for a terminal to perform a fast forward packet type communication in the present invention provides information on whether the terminal normally transmits a reverse control channel for supporting the fast forward packet access method. The base station periodically notifies the base station by assigning the quality information to the base station, and the base station checks whether the reverse control channel is transmitted by the terminal and determines whether to schedule the packet according to the fast packet data transmission.

HSDPA, auto retransmission, negative acknowledgment signal (NACK), transmission format combination (TFC), channel quality information (CQI)

Description

Communication status notification method in mobile communication system using high speed forward packet access method {METHOD FOR REPORTING CHANNEL WHETHER IN A COMMUNICATION SYSTEM USING HIGH SPEED DOWNLINK PACKET ACCESS SCHEME}

1 is a diagram illustrating a common control channel structure of a communication system using a high speed forward access method to which the present invention is applied.

2 is a diagram illustrating a process for efficiently performing HSDPA communication according to a first embodiment of the present invention.

3 is a view showing the operation of the terminal 100 according to the first embodiment of the present invention.

4 is a diagram illustrating the operation of a base station according to the first embodiment of the present invention;

5 is a diagram illustrating a process for efficiently performing HSDPA communication according to a second embodiment of the present invention.

6A and 6B illustrate the operation of the terminal 100 according to the second embodiment of the present invention.

6C and 6D illustrate the operation of a base station according to a second embodiment of the present invention.

7 is a diagram illustrating a process for efficiently performing HSDPA communication according to a third embodiment of the present invention.

8 is a diagram illustrating the operation of the terminal 100 according to the third embodiment of the present invention.

9 is a diagram illustrating the operation of a base station according to a third embodiment of the present invention;

The present invention provides efficient packet communication in a mobile communication system using a high-speed forward packet access method. In particular, when the terminal 100 cannot report a channel quality report and whether an error occurs, the base station is notified to the base station. To provide a way to.

Mobile communication systems are gradually evolving from high-speed voice data-oriented services to high-speed, high-quality wireless data packet communication systems for providing data and multimedia services. High Speed Downlink Packet Access (HSDPA) and 1xEV-DV standardization currently underway around 3GPP and 3GPP2 are standardized in 3G mobile communication systems. It can be seen as a typical proof of the effort to find a solution for high quality wireless data packet transmission service, the fourth generation mobile communication system has been developed based on the provision of higher speed, high quality multimedia service beyond that.

In general, the HSDPA scheme generally refers to a data transmission scheme including control channels for supporting forward high speed packet data transmission in a universal mobile terrestrial system (UMTS) communication system. The HSDPA allocates a plurality of codes to one terminal, determines the channel coding rate and modulation scheme according to the radio channel situation, and retransmits the information between the base station and the terminal 100, not between the base station controller and the terminal 100. By performing the Automatic Retransmission Request (hereinafter referred to as 'ARQ') operation, it maximizes the forward transmission capability.

1 is a diagram illustrating a common control channel structure of a communication system using a high speed forward access method to which the present invention is applied.

Referring to FIG. 1, a high speed physical downlink shared channel (hereinafter, referred to as HS-PDSCH) 110 is a forward channel through which substantial user data is transmitted. It may be composed of a plurality of codes, a channel shared by a plurality of terminals (100). In this case, the coding rate and the modulation scheme are adaptively determined according to the channel situation, and ARQ is applied between the base station 200 and the terminal 100 for data transmitted through the channel.

The High Speed Shared Control Channel 120 (hereinafter referred to as "HS-SCCH") 120 is a forward channel through which information necessary for decoding the HS-PDSCH channel is transmitted. That is, the number of codes and code positions of the HS-PDSCH channel, the amount of data to be transmitted per unit time, a modulation scheme, and ARQ related information are carried.

Downlink / Uplink Dedicate Physical Channel (hereinafter referred to as "DL / UL DPCH") (130, 140) is a plurality of terminals including the terminal 100, 100 for the HSDPA communication (100) Are dedicated channels assigned to them. In this case, the transmission output of the DL DPCH 120 may be associated with the transmission output of the HS-SCCH 120, and the transmission output of the UL DPCH 140 may be a high speed dedicated physical control channel (hereinafter referred to as High Speed Dedicated Physical Control Channel). Transmit power of " HS-DPCCH "

The HS-DPCCH 150 is a reverse channel through which the terminal 100 or 100 transmits control information related to HSDPA. Channel quality information (CQI), which means wireless channel quality, and an acknowledgment signal / negative signal (ACK / NACK) indicating whether an error occurs in the received HS-PDSCH are transmitted through the channel. .

In this regard, the sum of uplink transmission powers within a cell in a mobile communication system must be maintained at a constant level. That is, the increase in the reverse transmission power in a specific cell means that the interference between the cells is increased by acting as an interference signal to the neighbor cells, and the communication efficiency of the neighbor cells is lowered. In this regard, in order to limit the reverse transmission output of the cell in the UMTS mobile communication system, the maximum transmission power that the terminal 100 can use when the reverse dedicated channel of the terminal 100 is configured. That is, the network transmits the maximum allowed UL Tx power to the terminal 100, and the terminal 100 transmits its own backward transmission as the minimum value of the maximum output of the power amplifier and the maximum allowed backward transmission output. Limit the output. The minimum of the two values is called the actual maximum allowed reverse transmission output.

The backward transmission output of the terminal 100 is composed of the sum of the transmission output of the UL DPCH 140 and the transmission output of the HS-DPCCH 150. The UL DPCH 140 includes a Dedicated Physical Data Channel (DPDCH) and an Uplink Dedicated Physical Control Channel (UL-DPCCH). This is accomplished through the control physical channel (UL-DPCCH). The base station 200 measures the signal to interference ratio (SIR) of the pilot signal of the UL DPCCH, and when the SIR is lower than the reference value, instructs to increase the transmission power and instructs to decrease the transmission output.

Accordingly, the terminal 100 adjusts the transmission output of the DPCCH according to the transmission output control command of the base station 200, and then adjusts the transmission output of the DPDCH according to a predetermined transmission output ratio of the DPCCH and the DPDCH. In addition, the transmission power of the HS-DPCCH 150 is adjusted according to the transmission power ratio of the predetermined DPCCH and the HS-DPCCH 150. The sum of the DPCCH transmission output, the DPDCH transmission output, and the HS-DPCCH 150 transmission output becomes a reverse transmission output. In this case, the reverse transmission output should not exceed the actual maximum allowable reverse transmission output, and if exceeded, the practical maximum allowable reverse transmission output is controlled through the following method.

The first method is to reduce the transmission power of the UL-DPCCH, the UL-DPDCH, and the HS-DPCCH 150 of the UL-DPCH 140 by the same ratio, so that the sum is the actual maximum allowable reverse transmission output.                         

The second method is a method in which the HS-DPCCH 150 is not transmitted when the type of data transmitted through the UL-DPDCH is high priority data.

In the case of the first method, since the transmission output of each channel is reduced by the same ratio, there is a problem that the transmission quality of each channel is degraded. In particular, when the CQI or ACK / NACK signal transmitted through the HS-DPCCH 150 is deteriorated and interpreted in a different meaning, the problem of deteriorating HSDPA system efficiency is caused. For example, when the NACK signal transmitted by the terminal 100 or 100 is interpreted as an ACK signal, an error occurs in the ARQ operation, thereby causing a problem of data loss. In addition, when distortion occurs in the CQI information, a channel coding rate and a modulation scheme are determined based on wrong channel quality information, thereby causing a problem of wasting forward wireless transmission resources.

In addition, in the case of the second method, when the HS-DPCCH 150 is not transmitted, the base station 200 does not recognize that the HS-DPCCH 150 is not transmitted, and thus malfunctions of decoding the radio channel accordingly. Will be That is, similar to the method according to the first method, an error of ARQ operation occurs and CQI information distortion occurs.

Accordingly, an object of the present invention, which is invented to solve the problems of the prior art operating as described above, provides a method for efficiently performing high speed forward packet access communication in a mobile communication system using a high speed forward packet access method. It is.                         

Another object of the present invention is to provide a method for notifying a base station of a situation for a terminal to perform fast forward packet communication in a mobile communication system using a fast forward packet access method.

Another object of the present invention is to provide a method in which a base station does not allocate radio resources to the terminals by recognizing a terminal that cannot perform the fast forward packet data connection in a mobile communication system using a fast forward packet method. It is.

In a mobile communication system using a fast forward packet access scheme according to the present invention, a method for notifying a base station whether or not a normal transmission of a reverse control channel for supporting the fast forward packet access scheme by a terminal is performed by the terminal. Notifying a radio network controller whether the reverse control channel is transmitted through a message; transmitting, by the radio network controller, whether the reverse control channel is normally transmitted to the base station; and the base station of the reverse control channel Determining whether or not normal transmission is performed to determine whether to schedule according to high-speed packet data transmission, and the reverse control channel includes at least one of channel quality information and ACK / NACK information.

In addition, in a mobile communication system using a fast forward packet access scheme according to the present invention, a method for notifying a base station whether or not a normal transmission of a reverse control channel for supporting the fast forward packet access scheme by a terminal is performed by the terminal. A step of periodically notifying the base station by assigning information indicating whether the control channel is normally transmitted to the channel quality information in the reverse control channel; and checking whether the reverse control channel is normally transmitted by the base station, Determining whether to schedule.

In addition, in a mobile communication system using a fast forward packet access scheme according to the present invention, a method for notifying a base station whether or not a normal transmission of a reverse control channel for supporting the fast forward packet access scheme by a terminal is performed by the terminal. When the control channel cannot be transmitted normally, allocating information indicating that the reverse control channel is not in a normal transmission state to channel quality information in the reverse control channel, and notifying the base station to the base station; In case of resuming transmission, a process of notifying the radio network controller that the reverse control channel is in a normal transmission state through a radio resource control message, and the base station confirms whether the reverse control channel is normally transmitted, Whether scheduling Decision making process is included.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Definitions of terms to be described below should be made based on the contents throughout the specification.                     

In this regard, the present invention provides a method for notifying the upper network when a situation occurs in which the terminal 100 cannot reliably transmit the HS-DPCCH channel, and determines that the situation for the reliability is not temporary. It is. Accordingly, the upper network recognizes that there is no transmission of the HS-PDSCH to the terminal 100, and proposes a method for preventing the situation in which the terminal 100 must transmit the HS-DPCCH channel.

First, a description will be given of a method in which the terminal 100 detects the above-mentioned 'circumstance in which the state in which the HS-DPCCH channel cannot be reliably transmitted will continue for a considerable period of time'. The above situation means a situation in which the reverse transmission output continuously exceeds the actual maximum allowed reverse transmission output. The above situation may be defined as a case in which a reverse transmission output exceeds an actual maximum allowable reverse transmission output even though the terminal 100 transmits data at a minimum set of TFC (Transport Format Combination). Can be. Here, the minimum set of TFC means a transmission rate that the terminal 100 can transmit in any channel condition.

Herein, a transport format combination (hereinafter referred to as "TFC") corresponds to the transmission rate in a one-to-one manner, and the TFC is used to determine how the plurality of transport channels are multiplexed on a reverse dedicated data physical channel. Information indicating To be precise, it defines the amount of data transmitted per transport channel. Accordingly, a plurality of transport channels can be transmitted through the UL-DPDCH 140, for example, as follows.                     

Consider the case where transport channel 1 and transport channel 2 are multiplexed on the reverse dedicated data physical channel. The following TFCs can exist. TFC x = [amount of data transmitted through transport channel 1, amount of data transmitted through transport channel 2] TFC 0 = [100,0], TFC 1 = [0, 100], TFC 2 = [100, 100], TFC 3 = [0,200], ... can be set. That is, TFC 0 has an amount of data transmitted through transport channel 1 of 100 and no amount of data transmitted through transport channel 2. On the other hand, TFC 1 indicates that there is no amount of data transmitted through transport channel 1, and that the amount of data transmitted through transport channel 2 is 100. In addition, the TFC 2 indicates that there is no amount of data transmitted through the transport channel 1, and that the amount of data transmitted through the transport channel 2 is 200. Here, the ratio with the DPCCH transmission output for each of the TFCs is predetermined in the call setup process.

For example, the transmission output of TFC 2 and TFC 3 may be determined to be twice that of the DPCCH transmission output, and the transmission output of TFC 0 and TFC 1 may be 1.5 times the DPCCH transmission output. That is, before transmitting data, the terminal 100 calculates the transmission output of each TFC as the DPCCH transmission output value at that time, and the transmission output of the TFCs subtracts the DPCCH transmission output value from the actual maximum allowable reverse transmission output x. Check if it is greater than one value. If the transmission output of a specific TFC is larger than the value obtained by subtracting the DPCCH transmission output value from x, it continues for more than 15 slots in the previous 30 slots, and then again for a predetermined time (approximately 80 msec. If the situation persists, the TFC is in a blocked state. Accordingly, the terminal 100 selects a TFC before transmitting data, and excludes the TFC that is in a blocked state from the selection criteria. If all TFCs are in a blocked state, the terminal 100 is allowed to transmit only at a minimum set of TFCs.

The lowest transmission rate refers to TFCs having a minimum amount of data for each transport channel and data is not transmitted to another transport channel. This corresponds to TFC 0 and TFC 1. In other words, the lowest transmission rate is always considered to be in a supported state that is not blocked.

That is, in the present invention, the 'circumstance in which it is determined that the state in which the HS-DPCCH channel cannot be reliably transmitted for a long time is defined' is defined as follows. The determined situation 'is defined as an HS-DPCCH not available state.

1) HS-DPCCH not available state occurs

1. Only minimum set of TFC supported state

2 The reverse transmit power at the minimum set of TFCs exceeds the maximum allowed reverse transmit power.

In this regard, the terminal 100 detects the release of the HS-DPCCH not available state as follows.

2) release of HS-DPCCH not available state

1.Minimum set of TFC reverse transmission outputs do not exceed the actual maximum allowed reverse transmission outputs.

2. The difference between the reverse transmission output at the minimum set rate (TFC) and the actual maximum allowed reverse transmission output is greater than or equal to a certain value. The difference value may be the HS-DPCCH transmission output.

First embodiment

In this regard, FIG. 2 below illustrates a process of efficiently performing HSDPA communication according to the first embodiment of the present invention.

Referring to FIG. 2, in step 205, when the terminal 100 detects an HS-DPCCH not available state, in step 210, the terminal 100 transmits the HS to a base station controller (“RNC”) 300. Send a Radio Resource Control (RRC) message that notifies the DPCCH not available state. Upon receiving the RRC message indicating the HS-DPCCH not available state, in step 215, the RNC 300 transmits an HS-DPCCH not available to the base station 200 providing HSDPA communication to the terminal 100 through an NBAP message. Send a message. Accordingly, the base station 200 no longer transmits an HS-PDSCH to the terminal 100 and no longer interprets a channel quality indicator (CQI) transmitted from the terminal 100 through an HS-DPCCH. .

As described above, data transmitted through the HS-DPCCH includes ACK / NACK and CQI. Among them, the presence or absence of ACK / NACK depends on whether HS-PDSCH is transmitted. Therefore, ACK / NACK does not occur unless the base station 200 transmits the HS-PDSCH to the terminal 100. On the other hand, CQI is data transmitted periodically, the base station 200 and the terminal 100 transmits and interprets the CQI at a predetermined time. At this time, if the base station 200 does not know that the terminal 100 does not transmit the CQI, the base station 200 misunderstands that the CQI value is still being transmitted, and interprets an incorrect CQI value. Therefore, according to the first embodiment, transmission and reception of the CQI is stopped along with transmission and reception of the HS-DPCCH not available message.

At any time after transmitting the HS-DPCCH not available message, if the UE 100 detects the release of the HS-DPCCH not available state in step 220, the UE 100 may transmit an HS-DPCCH available message in step 225. Transmit to RNC 300 and resume CQI transmission. At this time, in step 230, the RNC 300 delivers the HS-DPCCH available message to the base station 200 providing HSDPA communication to the terminal 100. Accordingly, the base station 200 resumes the CQI analysis transmitted by the terminal 100, and also resumes HS-PDSCH transmission. Here, the HS-PDSCH transmission is based on a scheduling algorithm provided by the base station 200, and when the HS-PDSCH transmission is scheduled to the terminals 100, the terminal 100 may also receive the HS-PDSCH. That means considering it as a candidate. Likewise, stopping the HS-PDSCH transmission means that the terminal 100 does not consider when scheduling the HS-PDSCH transmission to the terminals 100 based on a scheduling algorithm.

3A and 3B are diagrams illustrating the operation of the terminal 100 according to the first embodiment of the present invention. 3a shows the operation of the terminal 100 in the HS-DPCCH not available state, and 3b shows the operation of the terminal 100 when the HS-DPCCH not available state is released.

First, referring to FIG. 3A, the terminal 100 in the HS-DPCCH not available state state detects that the HS-DPCCH not available state occurs in step 305. In step 310, the terminal 100 transmits an HS-DPCCH not available message to the RNC 300 through an RRC message. In step 315, the terminal 100 stops transmitting the CQI, which is to be transmitted periodically through the HS-DPCCH.

On the other hand, upon release of the HS-DPCCH not available state, the terminal 100 detects that the HS-DPCCH not available state is released in step 320. In step 325, the terminal 100 transmits an HS-DPCCH available message to the RNC 300 through an RRC message. In step 330, the terminal 100 resumes transmission of the CQI periodically through the HS-DPCCH.

In relation to this, the operation of the RNC 300 receives the HS-DPCCH not available message and the HS-DPCCH available message transmitted from the terminal 100 and performs HSDPA communication with the terminal 100. To pass. In this case, the RNC 300 receives the HS-DPCCH not available message and the HS-DPCCH available message and transmits the message to the base station 200 through an NBAP message. The operation of the RNC 300 will be omitted.

4 is a diagram illustrating the operation of the base station 200 according to the first embodiment of the present invention, wherein 4a illustrates the operation of the base station 200 upon receiving the HS-DPCCH not available message, and FIG. An operation of the base station 200 when receiving a DPCCH available message is shown.

First, referring to 4a, in step 405, the base station 200 receives the HS-DPCCH not available message from the RNC 300. In step 410, the base station 200 stops the HS-PDSCH scheduling for the terminal 100, and in step 415 stops the CQI analysis transmitted by the terminal 100 over the HS-DPCCH.

 Referring to FIG. 4B, in step 420, the base station 200 receives the HS-DPCCH available message from the RNC 300. In step 425, the base station 200 resumes HS-PDSCH scheduling for the terminal 100, and in step 430 resumes CQI analysis.

As described above, in the first embodiment of the present invention, the terminal 100 having a high probability of failing to reliably transmit the HS-DPCCH notifies the base station 200 of the fact as a result, and then HS-DPCCH. Abort the transfer. In addition, the base station 200 may increase the communication efficiency of the HSDPA by not transmitting data to the terminal 100 through the HS-PDSCH, that is, by excluding from the scheduling. In addition, the base station 200 has an advantage of not misreading the CQI information by notifying the base station whether the CQI is transmitted.

Second embodiment

In the first embodiment, an RRC message of HS-DPCCH not available is used to notify the base station 200 of the occurrence of the HS-DPCCH not available state, but the first embodiment uses a first layer signal. That is, in the second embodiment, the terminal 100 transmits a special CQI set to the base station 200 so that the scheduling of the HS-PDSCH does not exist for the terminal 100. The first layer signal is directly transmitted to the base station 200, which has the advantage of being faster than the RRC message.

5 is a diagram illustrating a process for efficiently performing HSDPA communication according to a second embodiment of the present invention.

Referring to FIG. 5, when the UE 100 detects that the HS-DPCCH not available state occurs in step 5050, it means that 'HS-DPCCH not available state has occurred' in the CQI transmission of the next period as shown in step 510. A dedicated CQI (hereinafter, referred to as "special CQI") is transmitted. Here, the CQI has a value between 0 and 31, wherein values between 1 and 30 represent specific channel conditions, and 0 and 31 are not used. For example, CQI 1 may refer to a channel situation suitable for transmitting 137 bits by modulating the QPSK to SF 16 code. In this regard, as the CQI value increases, a channel condition is good, and CQI 30 means a channel condition capable of transmitting 7168 bits. In this regard, since CQI 0 and 31 are not currently used values, CQI 0 may be used as a special CQI, which means that 'HS-DPCCH not available state occurs' among the CQI 0 and 31.

That is, from step 510 to step 515, the terminal 100 repeatedly transmits the special CQI at a predetermined cycle. Accordingly, the base station 200 receiving the special CQI stops HS-PDSCH scheduling for the terminal 100 and periodically interprets the CQI value.                     

In step 520, the UE 100 detects that the HS-DPCCH not available state has been released. In step 525, the terminal 100 stops transmitting the special CQI and transmits the CQI corresponding to the current channel status of the terminal 100. Therefore, when the base station 200 receives a normal CQI (normal CQI) value instead of a special CQI, the base station 200 resumes HS-PDSCH scheduling for the terminal 100.

That is, the base station 200 receives the CQI periodically transmitted from the terminal 100 to perform the HS-PDSCH scheduling in response to the channel situation.

6A and 6B are diagrams illustrating the operation of the terminal 100 according to the second embodiment of the present invention. That is, the 6a shows the operation of the terminal 100 in the HS-DPCCH not available state, and FIG. 6b shows the operation of the terminal 100 when the HS-DPCCH not available state is released.

Referring to FIG. 6A, in step 605, the terminal 100 detects that an HS-DPCCH not available state has occurred. In step 610, the terminal 100 transmits a special CQI through the HS-DPCCH. The terminal 100 periodically transmits the CQI until operation 610 is released until the HS-DPCCH not available state is released.

Referring to FIG. 6B, in step 615, the terminal 100 detects that the HS-DPCCH not available state is released. In step 620, the terminal 100 transmits a normal CQI through the HS-DPCCH. The normal CQI reflects the channel status of the terminal 100 and means a value of CQI 1 to 30, not a special CQI. Accordingly, the base station 200 checks the channel condition according to the corresponding CQI transmitted from the terminal 100 and performs scheduling of the HS-PDSCH.                     

6C and 6D illustrate the operation of the base station 200 according to the second embodiment of the present invention.

6c illustrates an operation of the base station 200 when receiving the HS-DPCCH not available message, and FIG. 6d illustrates an operation of the base station 200 when receiving the HS-DPCCH not available message.

First, referring to FIG. 6C, in step 625, the base station 200 receives a special CQI transmitted from the terminal 100. In step 630, the base station 200 stops HS-PDSCH scheduling for the terminal 100 that has transmitted the special CQI.

Referring to FIG. 6D, in step 635, the base station 200 receives a normal CQI transmitted from the terminal 200. The normal CQI is not a special CQI, that is, a general CQI, not a reserved value. In step 640, the base station 200 resumes HS-PDSCH scheduling for the terminal 100 having transmitted the normal CQI.

Third embodiment

The third embodiment is a method for securing a problem of continuously transmitting a special CQI with respect to the second embodiment, and the occurrence of the HS-DPCCH not available state notifies the special CQI and releases the HS-DPCCH not available state. Is to use an RRC message.

That is, according to the second embodiment, the UE has an advantage of quickly notifying the base station that the HS-DPCCH not available state has occurred through the transmission of the special CQI, while the release of the HS-DPCCH not available state is also CQI. You will be notified using. As a result, the terminal 100 and the base station 200 periodically have a disadvantage of performing CQI transmission and reception. In order to solve this problem, the following third embodiment is characterized in that the generation of the HS-DPCCH not available state notifies the special CQI, and the release of the HS-DPCCH not available state through an RRC message.

7 is a diagram illustrating a process for efficiently performing HSDPA communication according to a third embodiment of the present invention.

Referring to FIG. 7, when the UE 100 detects that the HS-DPCCH not available state has occurred in step 705, it means that 'HS-DPCCH not available state has occurred' in the CQI transmission of the next cycle in step 710. Send the special CQI value. After completing the special CQI transmission, the terminal 100 stops transmitting the CQI. In addition, the base station 200 receiving the special CQI from the terminal 100 recognizes that there is no CQI transmitted from the terminal 100, and does not perform HS-PDSCH scheduling for the terminal 100. .

In step 715, the terminal 100 detects that the HS-DPCCH not available state has been released. In step 720, the UE 100 transmits an HS-DPCCH available message to the RNC 300 through an RRC message and resumes CQI transmission. Receiving the HS-DPCCH available message, the RNC 300 delivers the HS-DPCCH available message to the base station 200 performing HSDPA communication with the terminal 100 through an NBAP message. Upon receiving the HS-DPCCH available message in step 725, the base station 200 resumes CQI analysis and resumes HS-PDSCH scheduling for the terminal 100.

8 is a diagram illustrating the operation of the terminal 100 according to the third embodiment of the present invention.

Referring to FIG. 8, FIG. 8A illustrates an operation of the terminal 100 when the HS-DPCCH not available state occurs, and 8b illustrates an operation of the terminal 100 when the HS-DPCCH not available state is released.

First, referring to FIG. 8A, in step 805, the UE 100 detects that an HS-DPCCH not available state has occurred. In step 810, the terminal 100 transmits a special CQI through the HS-DPCCH. In step 815, the terminal 100 stops transmitting the CQI which is to be transmitted periodically.

In step 820 of FIG. 8B, the UE 100 detects that the HS-DPCCH not available state is released. In step 825, the terminal 100 transmits an HS-DPCCH available message to the RNC 300. In step 830, the terminal 100 resumes CQI periodic transmission through the HS-DPCCH.

9 is a diagram illustrating the operation of the base station 200 according to the third embodiment of the present invention.

Referring to FIG. 9, FIG. 9A illustrates an operation of the base station 200 when the HS-DPCCH not available state occurs, and FIG. 9B illustrates an operation of the base station 200 when the HS-DPCCH not available state is released.

Referring to FIG. 9A, in step 905, the base station 200 receives a special CQI from the terminal 100.

In step 910, the base station 200 stops HS-PDSCH scheduling for the terminal 100 that has transmitted the special CQI. Accordingly, in step 915, the base station 200 detects that the terminal 100 having transmitted the special CQI does not transmit the CQI through the HS-DPCCH from the next period and stops interpreting the CQI.

In contrast, in step 920 of FIG. 9B, the base station 200 receives the HS-DPCCH available message from the RNC 300 through the NBAP message. In step 925, the base station 200 resumes HS-PDSCH scheduling for the corresponding UE 100 that has transmitted the HS-DPCCH available message. In step 930, the base station 200 resumes CQI analysis periodically transmitted through the HS-DPCCH for the terminal 100 that has transmitted the HS-DPCCH available message.

As described above, the third embodiment RNC 300 of the present invention receives the HS-DPCCH available message transmitted from the terminal 100 to the base station 200 in which the terminal 100 performs HSDPA communication. To pass. That is, since the terminal 100 does not need to periodically transmit a special CQI through the HS-DPCCH, it has the advantage of efficiently using radio resources and efficiently using power.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, when a mobile communication system using a high speed forward packet access method encounters a situation in which a terminal cannot report a channel quality report and an error occurrence, the base station is notified to the base station in advance so that the forward radio transmission resource is allocated. It has the effect of saving radio resources of the entire mobile communication system. In addition, the base station recognizes this in advance and has an effect of preventing the recognition of incorrect CQI information.

Claims (3)

In a mobile communication system using a high speed forward packet access method, a method for notifying a base station whether or not a terminal normally transmits a reverse control channel for supporting the fast forward packet access method, Notifying, by the terminal, whether the reverse control channel is transmitted to a radio network controller through a radio resource control message; Transmitting, by the radio network controller, whether the reverse control channel is normally transmitted to the base station; And Determining, by the base station, whether to schedule the reverse control channel or not according to fast packet data transmission by determining whether the reverse control channel is normally transmitted; The reverse control channel is a method for notifying the base station whether the transmission of the reverse control channel including at least one of channel quality information and ACK / NACK information. In a mobile communication system using a high speed forward packet access method, a method for notifying a base station whether or not a terminal normally transmits a reverse control channel for supporting the fast forward packet access method, Periodically notifying, by the terminal, information indicating whether the reverse control channel is normally transmitted to the base station by allocating channel quality information in the reverse control channel; And Determining, by the base station, whether or not the reverse control channel is normally transmitted and determining whether to schedule the reverse control channel according to a high speed packet data transmission. In a mobile communication system using a high speed forward packet access method, a method for notifying a base station whether or not a terminal normally transmits a reverse control channel for supporting the fast forward packet access method, If the terminal cannot transmit the reverse control channel normally, allocating information indicating that the reverse control channel is not in a normal transmission state to channel quality information in the reverse control channel and notifying the base station; When the terminal resumes normal transmission of the reverse control channel, notifying a radio network controller that the reverse control channel is in a normal transmission state through a radio resource control message; And Determining, by the base station, whether or not the reverse control channel is normally transmitted and determining whether to schedule the reverse control channel according to a high speed packet data transmission.

Images