KR20040050756A - Method for determining adaptive modulation coding option of high-speed imt-200 and computer readable medium storing thereof - Google Patents

Abstract

PURPOSE: A method for determining an adaptive modulation coding option of high-speed IMT-2000 and computer readable medium storing thereof are provided to improve the quality of real-time service. CONSTITUTION: A method for determining an adaptive modulation coding option of high-speed IMT-200 and computer readable medium storing thereof includes the steps of: a) determining whether the service is a real-time high speed service or not; b) selecting(S510) a channel quality indicator(CQI)-based AMC(CBA) algorithm if the result of the step a) is not a real-time high speed service, and selecting a hybrid automatic repeat request(HARQ)-based AMC(HBA) algorithm if the result of the step a) is a real-time high speed service; c) transmitting the response message for the hybrid re-transmission request of the inverse directional channel; d) determining the AMC algorithm to be currently processed; e) selecting the AMC option corresponding to the CQI in the look-up table if the algorithm is determined to be the CBA algorithm at step d); and f) determining the AMC option of the current traffic by using the AMC option and the CQI if the algorithm is determined to be the HAB algorithm at step d).

Description

METHOD FOR DETERMINING ADAPTIVE MODULATION CODING OPTION OF HIGH-SPEED IMT-200 AND COMPUTER READABLE MEDIUM STORING THEREOF}

The present invention relates to a high speed mobile communication system, and more particularly, to a method for determining an adaptive modulation coding (AMC) option in a next generation high speed mobile communication system and a computer readable recording medium storing the same.

In general, AMC function used for high speed downlink transmission in next generation high speed mobile communication system such as HSDPA (High Speed Downlink Packet Access) or 1XEV-DO (1X Evolution-data Only) is the CQI (Channel Quality) of the currently received channel. The AMC option is determined using only the Indicator value and the Look-Up table. In the case of providing a high-speed, high-capacity service in such a non-real time, it is possible to use the AMC option determination method as it only increases the number of retransmissions and does not affect the service.

However, if the AMC option is determined in this way for a channel that must be serviced in real time, the CQI of the transmitted channel is improved, but worse if the response message of the transmitted data is negative acknowledgment (NACK). Then, CRC (Cyclic Redundancy Checking) error occurs continuously and does not satisfy the real-time service.

Therefore, the present invention is to solve this problem, in the next-generation high-speed mobile communication system for storing the retransmission response message of the HARQ (Hybrid Automatic Repeat request), the previous AMC option information and CQI information for real-time high-speed service, accordingly AMC option It is an object of the present invention to provide a method for determining AMC options in a next generation high speed mobile communication system capable of improving the quality of a high speed real time service.

In addition, the present invention is to provide a computer-readable recording medium storing a program for realizing such a HBA (HARQ-Based AMC) algorithm.

1 is a diagram illustrating a schematic structure of a terminal termination device and a wireless access device in a general next generation high speed mobile communication system.

FIG. 2 is a diagram illustrating a look-up table for a channel quality indicator (CQI) for configuring adaptive modulation coding (AMC) in a general next generation high speed mobile communication system.

3 is a flowchart illustrating a method of selecting an AMC algorithm according to a quality of service (QoS) in a call control function when a session is required in a next generation high speed mobile communication system according to an embodiment of the present invention.

4 is a flowchart illustrating a method of selecting an AMC option using a conventional CBA (CQI-Based AMC) algorithm.

5 is a flowchart illustrating a method of selecting an AMC option using a HARQ-Based AMC (HBA) algorithm for a fast real-time service according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100: terminal termination unit (TE) 200: wireless access unit (BS)

110,210: PHY120,220: AMC

130,230: HARQ140,240: MAC

150, 250: RLC

According to an aspect of the present invention, there is provided a method for determining an AMC option in a next generation high speed mobile communication system, comprising: a) determining whether a service required for allocating a new session is a real time high speed service; b) If it is determined in step a) that the service is not a real-time high-speed service, select the CQI (Channel Quality Indicator) -based AMC algorithm as the AMC algorithm, and if it is determined that the real-time high-speed service, the HBA (HARQ (HARQ)) Selecting an Automatic Repeat Request-based AMC) algorithm; c) sending a response message to the hybrid retransmission request of the reverse channel; d) determining the AMC algorithm of the session to be processed currently; e) if it is determined in step d) that the CBA algorithm is selected, selecting an AMC option corresponding to the CQI from a look-up table; And f) if it is determined in step d) that the HBA algorithm is determined, determining the AMC option of the current traffic by using the stored AMC option and the CQI when transmitting the previous traffic.

F) step,

i) confirming whether the transmitted response message is a negative acknowledgment (NACK); ii) comparing the CQI of the previous traffic with the CQI of the current traffic, and adjusting the AMC option of the previous traffic according to the comparison result to determine the AMC option of the current traffic; And iii) transmitting the frame by applying the AMC option determined in step ii) according to the checking result of step i).

If it is confirmed in step i) that the response message is NACK,

In step ii),

If the CQI of the previous traffic is larger than the CQI of the current traffic, the AMC option of the previous traffic is reduced by two steps. If the CQI of the previous traffic is smaller than the CQI of the current traffic, the AMC option of the previous traffic is increased by one step. Send it.

If it is confirmed in step i) that the response message is not NACK,

In step ii),

If the CQI of the previous traffic is larger than the CQI of the current traffic, the AMC option of the previous traffic is reduced by two steps. If the CQI of the previous traffic is smaller than the CQI of the current traffic, the AMC option of the previous traffic is reduced by one step. Resend

In addition, the computer-readable recording medium storing the AMC option determination method in the next generation high speed mobile communication system according to the characteristics of the present invention is executable by a computer to perform the steps of the AMC option selection method in the next generation high speed mobile communication system. A computer-readable recording medium embodying a program consisting of instructions, comprising the steps of: a) determining whether a service required when allocating a new session is a real-time high speed service; b) If it is determined in step a) that the service is not a real-time high-speed service, select the CQI (Channel Quality Indicator) -based AMC algorithm as the AMC algorithm, and if it is determined that the real-time high-speed service, the HBA (HARQ (HARQ)) Selecting an Automatic Repeat Request-based AMC) algorithm; c) sending a response message to the hybrid retransmission request of the reverse channel; d) determining the AMC algorithm of the session to be processed currently; e) if it is determined in step d) that the CBA algorithm is selected, selecting an AMC option corresponding to the CQI from a look-up table; And f) if it is determined in step d) that the HBA algorithm is determined, determining the AMC option of the current traffic by using the stored AMC option and the CQI when transmitting the previous traffic.

F) step,

i) confirming whether the transmitted response message is a negative acknowledgment (NACK); ii) comparing the CQI of the previous traffic with the CQI of the current traffic, and adjusting the AMC option of the previous traffic according to the comparison result to determine the AMC option of the current traffic; And iii) transmitting the frame by applying the AMC option determined in step ii) according to the checking result of step i).

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings the most preferred embodiment that can be easily carried out by those of ordinary skill in the art as follows.

Figure 1 shows a schematic structure for explaining a terminal termination device and a wireless access device of the next generation high speed mobile communication system to which the present invention is applied.

As shown in FIG. 1, the terminal terminal equipment (TE) 100 and the radio access equipment (base station BS) 200 are L1, PHY 110, 210, AMC 120, 220, and HARQ, respectively. (130, 230), MAC (140, 240) and RLC (150, 250) functionality.

L1 in the terminal termination apparatus 100 is a modulation scheme required for receiving data transmitted from the radio access apparatus 200 and transmitting data to the radio access apparatus 200. In the radio access apparatus 200, L1 is a terminal termination. Radio modulation scheme for transmitting and receiving data to the device 100. PHYs 110 and 210 refer to physical layers. AMC (120, 220) is a function to determine the transmission method and transmission rate of the data to be transmitted using the information of the CQI, HARQ (130, 230) is a function to send a response message by determining whether there is a received data frame error. . In addition, MAC (Medium Access Control, 140, 240) is a function to control the resources of the transmission medium, RLC (Radio Link Control, 150, 250) is a function to control the radio link.

FIG. 2 illustrates a look-up table for CQI (Channel Quality Indicator) for AMC (Adaptive Modulation Coding) setting in a typical next generation high speed mobile communication system. As shown in FIG. 2, the AMC option may be selected according to the received CQI.

3 illustrates a method of selecting an AMC algorithm according to a quality of service (QoS) in a call control function when a session is requested in a next generation high speed mobile communication system according to an embodiment of the present invention.

As shown in FIG. 3, when the terminal termination apparatus 100 transmits a session request message to the wireless access apparatus 200, first, a service type that the current terminal wants to service is requested (S310), and the requested service type is provided. It is checked whether this is a real-time high-speed service (S320). As a result of the inspection, if the real-time high-speed service, the HBA (HARQ-Based AMC) algorithm is selected (S330), and for other services, the CBA (CQI-Based AMC) algorithm is selected (S340).

FIG. 4 is a flowchart illustrating a method of selecting an AMC option using a CQI-Based AMC algorithm in FIG. 3.

As shown in FIG. 4, the receiving end of the HARQ first transmits a retransmission response message to the packet scheduler (S400), and checks whether the AMC algorithm processed by the session to be processed is CBA (S410). If it is determined that the result is CBA, the AMC option is selected according to the CQI in the lookup table of FIG. 2 (S420). On the other hand, if it is determined that the CBA is not, using the HBA algorithm as the AMC algorithm of the session (S430).

5 is a flowchart illustrating a method of selecting an AMC option using a HARQ-Based AMC (HBA) algorithm for a fast real-time service according to an embodiment of the present invention.

As shown in FIG. 5, the receiving end of the HARQ transmits a retransmission response message to the packet scheduler (S500), and checks whether the AMC algorithm processed by the session to be processed is CBA (S510). If it is determined that the test result is CBA, the AMC option is selected according to the CQI in the lookup table as in step S420 of FIG. 4 (S520).

On the other hand, if it is determined that the CBA is not, it is checked whether the retransmission response message transmitted from the HARQ receiver is a negative acknowledgment (NACK) response message (S530). If the result of the check is not a NACK response message, it is checked whether the currently received CQI _n is smaller than the previously received CQI _n-1 (S540). If the CQI _n is smaller than the CQI _n-1 , the AMC option is retransmitted with two smaller steps (S550). If the CQI _n is larger than the CQI _n-1 , the AMC option is retransmitted with a smaller one step (S560). .

On the other hand, if it is confirmed that the response message in S530 as a NACK response message, it is checked whether the currently received CQI _n is smaller than the previously received CQI _n-1 (S570). If CQI _n is smaller than CQI _n-1 , the next frame is transmitted by reducing the AMC option by one step (S580). If CQI _n is larger than CQI _n-1 , the next frame is increased by one step. It is transmitted (S590).

Meanwhile, the method for allocating time slices according to an embodiment of the present invention may be implemented as a program and stored in a computer-readable recording medium such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, a magneto-optical disk, and the like.

The drawings and detailed description of the invention are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the claims or in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the present invention selects the AMC algorithm method when the session is established in the AMC option determination method of the next-generation high-speed mobile communication system, and when the current AMC option is determined by storing a retransmission response message of HARQ, previous AMC option information, and CQI information. By using it, the quality of real-time service is improved.

Claims (6)

In the method of selecting the Adaptive Modulation Coding (AMC) option for downlink transmission in a next generation high speed mobile communication system, a) determining whether a service required when allocating a new session is a real-time high-speed service; b) If it is determined in step a) that the service is not a real-time high-speed service, select the CQI (Channel Quality Indicator) -based AMC algorithm as the AMC algorithm, and if it is determined that the real-time high-speed service, the HBA (HARQ (HARQ)) Selecting an Automatic Repeat Request-based AMC) algorithm; c) sending a response message to the hybrid retransmission request of the reverse channel; d) determining the AMC algorithm of the session to be processed currently; e) if it is determined in step d) that the CBA algorithm is selected, selecting an AMC option corresponding to the CQI from a look-up table; And f) if it is determined in step d) that the HBA algorithm, determining the AMC option of the current traffic using the stored AMC option and CQI when transmitting the previous traffic; AMC option selection method in the next-generation high-speed mobile communication system comprising a. The method of claim 1, F) step, i) confirming whether the transmitted response message is a negative acknowledgment (NACK); ii) comparing the CQI of the previous traffic with the CQI of the current traffic, and adjusting the AMC option of the previous traffic according to the comparison result to determine the AMC option of the current traffic; And iii) transmitting the frame by applying the AMC option determined in step ii) according to the check result of step i) AMC option selection method in the next-generation high-speed mobile communication system comprising a. The method of claim 2, If it is confirmed in step i) that the response message is NACK, In step ii), If the CQI of the previous traffic is larger than the CQI of the current traffic, the AMC option of the previous traffic is reduced by two steps. If the CQI of the previous traffic is smaller than the CQI of the current traffic, the AMC option of the previous traffic is increased by one step. To transmit AMC option selection method in next generation high speed mobile communication system. The method of claim 2, If it is confirmed in step i) that the response message is not NACK, In step ii), If the CQI of the previous traffic is larger than the CQI of the current traffic, the AMC option of the previous traffic is reduced by two steps. If the CQI of the previous traffic is smaller than the CQI of the current traffic, the AMC option of the previous traffic is reduced by one step. To resend AMC option selection method in next generation high speed mobile communication system. A computer-readable recording medium tangibly embodying a program composed of instructions executable by a computer to perform the steps of an AMC option selection method in a next generation high speed mobile communication system, The method step, a) determining whether a service required when allocating a new session is a real-time high-speed service; b) If it is determined in step a) that the service is not a real-time high-speed service, select the CQI (Channel Quality Indicator) -based AMC algorithm as the AMC algorithm, and if it is determined that the real-time high-speed service, the HBA (HARQ (HARQ)) Selecting an Automatic Repeat Request-based AMC) algorithm; c) sending a response message to the hybrid retransmission request of the reverse channel; d) determining the AMC algorithm of the session to be processed currently; e) if it is determined in step d) that the CBA algorithm is selected, selecting an AMC option corresponding to the CQI from a look-up table; And f) if it is determined in step d) that the HBA algorithm, determining the AMC option of the current traffic using the stored AMC option and CQI when transmitting the previous traffic; Computer-readable recording medium comprising a. The method of claim 5, F) step, i) confirming whether the transmitted response message is a negative acknowledgment (NACK); ii) comparing the CQI of the previous traffic with the CQI of the current traffic, and adjusting the AMC option of the previous traffic according to the comparison result to determine the AMC option of the current traffic; And iii) transmitting the frame by applying the AMC option determined in step ii) according to the check result of step i) Computer-readable recording medium comprising a.