KR20050120189A - Method of controlling uplink packet transmission in mobile communications system - Google Patents

Abstract

The present invention relates to a method for controlling uplink packet transmission in a wireless mobile communication system which can reduce the occurrence of resource shortage or waste due to the base station scheduler not responding to the rapid increase or decrease of the amount of uplink data. In a method for controlling uplink packet transmission in a wireless mobile communication system according to the present invention, a base station transmits an up or down command of an uplink data rate (or transmit power) to a terminal to perform scheduling. A method for controlling uplink packet transmission from the terminal in a wireless mobile communication system, comprising: determining whether to prohibit or permit packet transmission of the terminal; And transmitting an inhibit or permit command to the terminal according to the determination content.

Description

Method for controlling uplink packet transmission in wireless mobile communication system {Method of controlling uplink packet transmission in mobile communications system}

The present invention relates to a wireless mobile communication system. More specifically, the present invention relates to a method for controlling uplink packet transmission in a wireless mobile communication system that can reduce the occurrence of resource shortage or waste due to the base station scheduler failing to cope with the rapid increase and decrease of the amount of uplink data. .

Recently, in the wireless mobile communication system, there is an active discussion on the high-speed mobile communication method in the uplink for transmitting data from the terminal to the base station in accordance with the demand for uplink speed and capacity increase. The representative example is the Enhanced Uplink Dedicated Channel (E-DCH) technology, which is being discussed in the 3GPP WCDMA wireless mobile communication system. In the E-DCH technology, uplink packet scheduling based on a base station (Node B) and a HARQ (Hybrid ARQ) in the physical layer are introduced into the existing 3GPP WCDMA uplink dedicated channel (DCH) to improve uplink efficiency. I'm trying.

In the HARQ scheme, the receiving side checks the quality of the data packet transmitted from the transmitting side, and if there is a defect, requests the transmitting side to retransmit the data packet, and the transmitting side retransmits an error packet. In this case, the signal information used for notifying whether a packet reception error is received and requesting new transmission or retransmission is called an ACK / NACK signal, and transmitting an ACK / NACK signal from a transmitter to a receiver is called ACK / NACK signaling. do.

As another one of the E-DCH technologies to be applied to 3GPP WCDMA uplink, there is a Node B scheduling scheme. In the base station scheduling method, when the scheduler of the base station specifies a transmission rate, transmission time, etc. for a packet transmitted from the terminal, the terminal transmits the packet accordingly. Generally, according to the scheduling method in the base station, scheduling of transmission rate (or transmission power) is performed. (rate / power scheduling), time and rate (or transmission power) scheduling method (time and rate / power scheduling) can be classified.

In a transmission rate (or transmission power) scheduling scheme, a base station controls a rate or transmission power of a packet for each terminal in a cell. In this case, it may be instructed to increase (UP), decrease (DOWN), or maintain (KEEP) the transmission rate or transmission power by a predetermined amount according to the scheduling command used.

The time and transmission rate (or transmission power) scheduling scheme controls the transmission time and transmission rate of the packet with respect to the terminals in the cell, so that only specific UEs transmit the packet at a specific transmission rate (or transmission power) during a specific time. You can control it to resend.

The aforementioned two types of base station scheduling schemes have the following advantages and disadvantages. Although the transmission rate (or transmission power) scheduling method transmits only one bit UP / DOWN or UP / DOWN / KEEP scheduling commands on the downlink, the resource required for signaling for scheduling is small, but the transmission rate or power is increased or decreased. Since the width is predetermined, there is a problem in that it is not possible to accurately and quickly cope with a sudden increase or decrease in the amount of uplink data.

On the other hand, the time and transmission rate (or transmission power) scheduling scheme has the advantage of being able to respond more accurately and quickly to changes in the amount of uplink data, but has a problem that the amount of signals to be transmitted on the downlink for scheduling is increased. have.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is that the base station scheduler does not quickly and accurately cope with a sudden increase or decrease of the amount of uplink data to cause a lack of resources or waste problems It is to provide a method for controlling uplink packet transmission in a wireless mobile communication system that can reduce the number of packets.

Summary of the Invention

The present invention discloses a method of additionally operating a transmission prohibition or allow command in order to improve the problem of the base station scheduler of the existing transmission rate or transmission power scheduling scheme. In the present invention, the base station transmits an Inhibit / Permit command to prohibit or allow uplink transmission of each terminal in addition to the UP / DOWN command for uplink transmission rate (or transmission power) to each terminal. .

When the terminal receives the transmission prohibition command from the base station, the terminal cannot transmit the uplink data packet even if there is a transmission rate (or transmission power) allowed by the uplink transmission rate (or transmission power) increase or decrease command until the transmission allow command is received. . In addition, the terminal receiving the transmission permission signal may transmit an uplink data packet within a transmission rate (or transmission power) range adjusted by an uplink transmission rate (or transmission power) increase or decrease command until the transmission inhibition signal is received later. Will be.

By the above-described method, the base station may prohibit or allow uplink packet transmission of some terminals for uplink packet transmission. In addition, in a wireless mobile communication system supporting the HARQ scheme, an uplink transmission prohibition command may be applied only to initial transmission or both initial transmission and retransmission packets may be applied. In addition, it may be possible to apply the retransmission packet only separately.

In one aspect of the present invention, in a method for controlling uplink packet transmission in a wireless mobile communication system according to the present invention, a base station issues an instruction to increase or decrease an uplink data rate (or transmit power) to a terminal. A method for controlling uplink packet transmission from a terminal in a wireless mobile communication system transmitting and performing scheduling, the method comprising: determining whether to prohibit or permit packet transmission of the terminal; And transmitting an inhibit or permit command to the terminal according to the determination content.

In another aspect of the present invention, in a method for controlling uplink packet transmission in a wireless mobile communication system according to the present invention, a base station issues an instruction to increase or decrease an uplink data rate (or transmit power) to a terminal. A method for controlling uplink packet transmission by a terminal in a wireless mobile communication system transmitting and performing scheduling, the method comprising: receiving a command to prohibit or allow packet transmission from the base station; And stopping the packet transmission or initiating the packet transmission according to the content of the received command.

Examples of the downlink signaling of the transmission prohibition / permit signal for each terminal to specifically apply the technical feature of the present invention include the following methods.

First, a method of controlling uplink data transmission by signaling a transmission inhibit / allow command independently of an existing signal (eg, ACK / NACK, UP / DOWN). Second, a method of controlling uplink data transmission by configuring an ACK / NACK signal and a transmission inhibit / allow command as one downlink transmission symbol. Third, a method of controlling uplink data transmission by configuring ACK / NACK signal and a transmission prohibition / allow command to multiplex the same signal channel in time. Fourth, the uplink data transmission is controlled by configuring a scheduler command (UP / DOWN) and a transmission prohibition / allow command into one downlink transmission symbol.

Example

Hereinafter, as a method for improving and supplementing an uplink data packet transmission control method of an existing base station scheduler in a wireless mobile communication system according to the present invention, it is preferable to use a signal transmission method in a base station scheduler to which a transmission prohibition or allow command is added. Embodiments will be described with reference to the accompanying drawings.

The following embodiments are described with reference to Enhanced Uplink Dedicated Channel (E-DCH), which is discussed in the 3rd Generation Partnership Project (3GPP) WCDMA system, but the present invention may be applied to any wireless mobile communication system.

The method of transmitting an uplink packet transmission prohibition or permission command to a mobile station can be largely classified as follows.

First, the base station allocates a signal bit separately from an existing signal (UP / DOWN, ACK / NACK, etc.) and transmits an uplink packet transmission prohibition or allow command to the terminal. Since a separate signal space is used, when a user wants to prohibit or allow uplink packet transmission, a command can be transmitted regardless of transmission of an existing signal. On the other hand, there is a disadvantage that a separate signal bandwidth is required.

Secondly, unlike the first method, the uplink transmission prohibition or allow command is combined with the existing signals or multiplexed and transmitted. For example, it may be used in combination with an existing scheduling command (UP / DOWN) or in combination with an ACK / NACK signal indicating whether the packet transmitted from the terminal is correctly received. Alternatively, the transmission may be performed by multiplexing with an ACK / NACK signal. By the above method, a transmission prohibition or allow function can be implemented while minimizing the burden on signal addition.

1 is a view for explaining an embodiment of the present invention, in the case of a base station in the wireless mobile communication system supporting the HARQ scheme to transmit to the terminal by adding an uplink transmission prohibition or allow command to the ACK / NACK signal Explaining. The base station Node B, which has received the packet from the UE, transmits an ACK signal if the packet has no error and a NACK signal if the packet has an error according to the reception state of the packet. When a situation in which the terminal needs to quickly reduce the transmission of the packet while transmitting the packet occurs, the base station prohibits the transmission of the terminal by transmitting a packet transmission prohibition command using a channel through which an ACK / NACK signal is transmitted. In this case, even if ACK / NACK is not transmitted, the transmission prohibition or permission command may be transmitted. Thereafter, when the base station wants to start packet transmission of the terminal, the terminal transmits a packet transmission permission command using an ACK / NACK signal channel so that the terminal starts packet transmission.

Fig. 2 shows an example of the constellation of the packet transmission prohibition or permission signal combined with the ACK / NACK signal. In the example shown in FIG. 2, the terminal in the state of prohibiting packet transmission switches to the transmission permission state when receiving the packet transmission permission command, and, on the contrary, the terminal in the state of the transmission permission transition to the transmission prohibition state when receiving the packet transmission permission command In this case, the prohibition signal and the allowance signal are not divided into different properties. In addition, in the constellation of the example shown in Fig. 2, the states of "(ACK) + transmission prohibition / allow command" and "(NACK) + transmission prohibition / allow command" are not only commands for allowing or prohibiting transmission, but also for ACK or NACK. Meaning can also imply.

3 illustrates a method of transmitting an uplink packet transmission prohibition or allow signal using a channel for transmitting an ACK / NACK signal when the base station does not need to transmit an ACK / NACK signal because the terminal does not transmit a packet. If it is desired to prohibit the packet transmission of the UE using the uplink under the determination of the base station scheduler, the corresponding purpose can be achieved by transmitting an uplink packet transmission prohibition command through a channel transmitting the ACK / NACK signal. Thereafter, when the UE wants to allow packet transmission, the transmission prohibition may be released by transmitting an uplink packet transmission permission command through the ACK / NACK signal channel.

In this case, the reception performance of the terminal can be improved by transmitting a transmission prohibition or allow signal by 1 bit antipodal signaling. The terminal detects the presence or absence of the signal for the channel receiving the ACK / NACK signal even when the ACK / NACK signal is not expected because the packet is not transmitted, and is an uplink packet prohibition signal when it is determined that the signal exists. Awareness should be distinguished.

As another method, the terminal recognizes that the signal always comes to the channel receiving the ACK / NACK signal by sending a prohibition or allow command at all times during a time interval in which the terminal does not transmit the packet and thus does not expect the ACK / NACK signal. This is how you implement it. Therefore, a detection process for determining the presence or absence of a signal is unnecessary.

FIG. 5 shows an example of a constellation configuration of a transmission allow or prohibit command in combination with an UP / DOWN scheduling command of transmission rate (or transmission power) scheduling. As with the example of adding constellations to the ACK / NACK signal, in this example, as shown in the 3rd and 4th quadrants, even if the UP / DOWN scheduling command is not transmitted, the transmission prohibition or allow command may be transmitted and the signal may be transmitted or not transmitted. It implies that it can also mean an UP / DOWN instruction with a permission.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

According to the present invention, the scheduler fails to cope with the rapid increase or decrease of the amount of uplink data, thereby reducing the shortage or waste of uplink resources, thereby increasing the overall throughput of the system and contributing to improving system stability. There is.

In addition, by applying the present invention there is an effect that can compensate for the problem that may cause the inaccuracy of scheduling and the waste of bandwidth, even system paralysis caused by the scheduling of the existing transmission rate (or transmission power) base station scheduler.

1 is a view for explaining a method of adding a transmission prohibition / permission command to a HARQ ACK / NACK signal in an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of constellations for ACK / NACK and transmission prohibition / permit signals in a preferred embodiment of the present invention.

3 is a view for explaining a method of transmitting a transmission prohibition / allow command when there is no transmission of HARQ ACK / NACK signal in another embodiment according to the present invention.

4 is a view showing an example of the constellation for the ACK / NACK, transmission inhibit / allow signal in another embodiment according to the present invention.

FIG. 5 is a diagram illustrating an example of constellations for UP / DOWN and transmission prohibition / permit signals in another embodiment according to the present invention.

Claims (15)

A base station transmits an up or down command of an uplink data rate (or transmit power) to a user equipment to control uplink packet transmission from the user equipment in a wireless mobile communication system performing scheduling. In the method, Determining whether to prohibit or allow packet transmission of the terminal; And And transmitting an inhibitor or permit command to the terminal according to the determination content. The method of claim 1, The terminal receiving the packet transmission inhibit command from the base station stops uplink packet transmission until receiving a packet transmission allowance command from the base station. The method of claim 1, If the wireless mobile communication system supports the HARQ scheme, the packet transmission prohibition or allow command is applied only to a newly transmitted packet transmitted from the terminal to the base station. The method of claim 1, When the wireless mobile communication system supports the HARQ scheme, the packet transmission prohibition or permission command is applied to newly transmitted and retransmitted packets transmitted from the terminal to the base station. Way. The method of claim 1, The uplink packet transmission control method according to claim 1, wherein the prohibition or allow command of the packet is composed of the downlink scheduling command (UP / DOWN) and one symbol. The method according to claim 3 or 4, The packet transmission prohibition or allow command is composed of an ACK or NACK signal and one symbol and transmitted. The method of claim 1, The packet transmission inhibit or allow command is transmitted through an independent signal channel. The method according to claim 3 or 4, The packet transmission prohibition or allow command is transmitted by being time multiplexed with an ACK or NACK signal. In a method for controlling uplink packet transmission by a terminal in a wireless mobile communication system in which a base station transmits an up or down command to increase or decrease uplink data rate (or transmission power) to a terminal to perform scheduling. In Receiving a command to prohibit or allow packet transmission from the base station; And Stopping the packet transmission or initiating the packet transmission according to the content of the received command. The method of claim 9, If the wireless mobile communication system supports the HARQ scheme, the packet transmission prohibition or allow command is applied only to a newly transmitted packet transmitted from the terminal to the base station. The method of claim 9, When the wireless mobile communication system supports the HARQ scheme, the packet transmission prohibition or permission command is applied to newly transmitted and retransmitted packets transmitted from the terminal to the base station. Way. The method of claim 9, The uplink packet transmission control method according to claim 1, wherein the prohibition or allow command of the packet is composed of the downlink scheduling command (UP / DOWN) and one symbol. The method according to claim 10 or 11, wherein The packet transmission prohibition or allow command is composed of an ACK or NACK signal and one symbol and transmitted. The method of claim 9, The packet transmission inhibit or allow command is transmitted through an independent signal channel. The method according to claim 10 or 11, wherein The packet transmission prohibition or allow command is transmitted by being time multiplexed with an ACK or NACK signal.