KR20050106213A - Method of controlling uplink data transmission in mobile communication system - Google Patents

Abstract

The present invention is to control the uplink data transmission of the wireless mobile communication system that can reduce the burden on the system by reducing the amount of control information transmitted from the base station for the control of data transmitted from the terminal in the wireless mobile communication system It is about a method. According to an aspect of the present invention, there is provided a method for controlling uplink data transmission, comprising: receiving a scheduling command transmitted from the base station in a method of controlling traffic data transmitted from a terminal of a wireless mobile communication system to a base station; And transmitting the traffic data to the base station according to the content of the scheduling command for a predetermined time period after a predetermined time elapses from the time when the scheduling command is received.

Description

Method of controlling uplink data transmission in a wireless mobile communication system {Method of controlling uplink data transmission in mobile communication system}

The present invention relates to a wireless mobile communication system. More specifically, in the wireless mobile communication system, uplink data of the wireless mobile communication system capable of reducing the burden on the system by reducing the amount of control information transmitted from the base station for controlling data transmitted from the terminal through the uplink. The present invention relates to a transmission control method.

Recently, in the cellular wireless mobile communication system, a high-speed packet communication method in uplink for transmitting data from a terminal to a base station has been actively conducted in response to a demand for higher speed of uplink. A representative example is the enhanced uplink dedicated channel (E-DCH), which is being discussed in 3GPP wireless mobile communication. The main technologies employed for the E-DCH include Node B controlled scheduling, Hybrid Auto Retransmission reQuest (HARQ), and Short Transmit Time Interval (TTI).

In a conventional asynchronous (3GPP) mobile communication system, uplink scheduling is performed in a Radio Network Controller (RNC). Scheduling in the RNC is a method in which each UE adjusts a Transport Format Combination Set (TFCS) based on information received from a UE and a Node B for a relatively long time interval. In the RNC scheduling scheme, since scheduling is performed at a higher layer, it is difficult to quickly adapt to changes in channel and terminal states.

In order to solve the above problem, the E-DCH proposes a technique for performing uplink scheduling in a Node B. This technique is called Node B controlled scheduling. Base station control scheduling can be divided into two types, rate scheduling and time and rate scheduling.

In rate scheduling, the RNC transmits information on a transport format combination set (TFCS) to an eNB and a UE during an initial setup period. The base station adjusts the TFCS of the terminal step by step as in the case of power control. That is, the TFCs of the UE are gradually adjusted in the TFCS of the UE through the downlink control signal. For example, assuming that the terminal stores 100 TFCs arranged in the order of transmission power, and that the index of the TFC currently transmitted by the terminal is 50 times, the base station Node B is' UP ',' By transmitting a scheduling command indicating a HOLD 'or' DOWN 'to the UE, the index of the maximum TFC that the UE can transmit may be adjusted to 51, 50, or 49, respectively. At this time, the terminal can transmit data only to the TFC of the index corresponding to the maximum TFC index or less scheduled by the base station.

Unlike time scheduling, in time and speed scheduling, the maximum TFC of the terminal is not adjusted step by step, but the maximum TFC suitable for the current situation and the maximum TFC are simultaneously informed until a valid time. For example, assuming that the terminal stores 100 TFCS arranged in order of transmission power, and that the maximum TFC that the terminal can transmit is 50, the base station can transmit the next time interval by the downlink control signal. The maximum TFC can be any TFC in the entire TFCS. That is, the speed scheduling scheme can adjust the TFC step by step, while the time and speed scheduling scheme can adjust the TFC at once. Therefore, in a situation where the TFC of the terminal is to be changed rapidly, the time and speed scheduling scheme is advantageous.

However, in the case of the time and speed scheduling scheme, as described above, a maximum amount of TFCs that can be used by the UE and a valid time interval of the TFC can be simultaneously informed through a downlink scheduling command. Downlink control signal transmission is required. In particular, in order to transmit the time interval, information on a start time and an end time must be transmitted. Therefore, a large amount of control signals must be transmitted.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a base station for controlling the transmission of traffic data transmitted through the uplink (uplink) from the terminal to the base station in a mobile communication system It is to provide an uplink data transmission control method that can reduce the burden of the entire system by reducing the amount of data of the control information transmitted to the terminal.

Summary of the Invention

In one aspect of the present invention, a method for controlling uplink data transmission according to the present invention includes a method of controlling traffic data transmitted from a terminal to a base station in a wireless mobile communication system, the scheduling command being transmitted from the base station. Receiving; And transmitting the traffic data to the base station according to the content of the scheduling command for a predetermined time period after a predetermined time elapses from the time when the scheduling command is received.

In another aspect of the present invention, a method for controlling uplink data transmission according to the present invention is a method for controlling traffic data transmitted from a terminal to a base station in a wireless mobile communication system, the index of TFC (Transprot Format Combination) available from the base station Receiving a scheduling command including an index and an effective time interval of the TFC; And transmitting the traffic data to the base station according to the content of the TFC during the valid time period from a predetermined time after receiving the scheduling command.

Example

Hereinafter, a preferred embodiment of an uplink data transmission control method according to the present invention will be described with reference to the accompanying drawings. 1 is a process flow diagram of a preferred embodiment of the present invention.

Referring to FIG. 1, a base station Node B transmits a Transport Format Combination Set (TFCS) to a UE in a call setup step (S11). TF (Transmit Format) means configuration information of a transport block set transmitted during a specific transmission time interval (TTI). The TF is divided into dynamic configuration information and semi-static configuration information, and the dynamic configuration information includes transport block size and transport block set size information, and the static configuration information includes TTI and error correction code (Turbo). Code or convolutional code), coding rate, CRC size, and the like. One or several transport channels are multiplexed in the physical layer, and can be transmitted only by using a combination of TFs supported in the physical channel. The combination of transportable TFs is called TFC (Transport Format Combination), and the set of usable TFCs is defined as TFCS (Transport Format Combination Set). The TFCS available for call setup of the base station Node B and the terminal UE is transmitted from the base station to the terminal (S11).

When a call is established between the base station and the terminal, the base station transmits a scheduling command to the terminal to control the transmission of traffic data through the uplink E-DCH (S13). In the present embodiment, in order to reduce the data amount of the downlink scheduling command in the E-DCH employing a time and rate scheduling scheme, the maximum TFC index and the maximum TFC can be used. Characterized in that the usable valid time interval is transmitted as a control signal.

In the prior art, there is a problem in that the amount of data is increased by including an effective time interval and a start time in the scheduling command. In the present invention, the start time is transmitted by setting the start time to a certain reference point in advance. There is no need.

For example, if the terminal is configured to transmit data through the E-DCH during the valid time according to the contents of the TFC specified by the scheduling command after a predetermined time after receiving the scheduling command, the downlink at the start time (start time) Even without transmitting the information, the terminal can know when to start the transmission.

According to the above example, when transmitting the scheduling matters determined by the base station scheduler to the terminal using the downlink control channel, adjusting the timing of transmission on the downlink control channel is the same as adjusting the starting point of data transmission of the terminal. do. That is, as illustrated in FIGS. 2A and 2B, when the transmission start times T1, T2, and T3 of the scheduling command transmitted to the terminal 1, the terminal 2, and the terminal 3 are transmitted through the downlink control channel, respectively, the terminal is controlled. 1, UE 2 and UE 3 can transmit data after a preset time Tconst has elapsed from the time point at which the scheduling command transmitted to the UE is received. As a result, it can be seen that uplink data transmission start time is controlled. 2,?,?, And? Are arbitrary constants determined by terminal 1, terminal 2, and terminal 3, respectively.

The predetermined specific time may be determined based on a connection frame number (CFN) or a system frame number (SFN). Alternatively, the predetermined specific time may be a reception time of another downlink at a predetermined time after receiving the scheduling command. In addition, the TFCI and the TFCI may be transmitted in a scheduling command including only a valid end time.

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 construed 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 method for controlling uplink data transmission in a mobile communication system according to the present invention, a transmission start time point of a UE transmitting an E-DCH using time and speed scheduling is linked to a downlink control signal reception time point. Even if the link does not transmit information related to a start time, the terminal may know when to start transmission.

Therefore, the amount of control information to be transmitted in the downlink is reduced, and the efficiency of transmitting the downlink control signal can be increased, thereby reducing the burden on the system.

1 is a process flow diagram of a preferred embodiment according to the present invention.

2A is a diagram for explaining an example of downlink control signal transmission in a preferred embodiment according to the present invention.

Figure 2b is a view for explaining an example of uplink data transmission in a preferred embodiment according to the present invention.

Claims (11)

In the control method of traffic data transmitted from a terminal of a wireless mobile communication system to a base station, Receiving a scheduling command transmitted from the base station; And And transmitting the traffic data to the base station according to the content of the scheduling command for a predetermined time period after a predetermined time elapses from the time when the scheduling command is received. The method of claim 1, And the predetermined time interval is included in the scheduling command and transmitted. The method of claim 1, And an end time of the predetermined time interval is included in the scheduling command and transmitted. The method of claim 1, And the predetermined specific time is set based on a connection frame number (CFN) or a system frame number (SFN). The method of claim 1, And the predetermined specific time is a reception time of another downlink at a predetermined time after receiving the scheduling command. The method of claim 1, And a channel on which the traffic data is transmitted is enhanced uplink dedicated channel (E-DCH). In the control method of traffic data transmitted from a terminal of a wireless mobile communication system to a base station, Receiving a scheduling command including an index of a TFC (Transprot Format Combination) available from a base station and an effective time interval of the TFC; And And transmitting the traffic data to the base station according to the content of the TFC during the valid time period from a predetermined time after receiving the scheduling command. The method of claim 7, wherein And an end time of the valid time interval is included in the scheduling command and transmitted. The method of claim 7, wherein The preset specific time is uplink data transmission control method, characterized in that is set by the CFN (System Frame Number) or SFN (System Frame Number). The method of claim 7, wherein The preset specific time is a data transmission control method, characterized in that the reception time of another downlink at a certain time after receiving the scheduling command. The method of claim 7, wherein And a channel on which the traffic data is transmitted is enhanced uplink dedicated channel (E-DCH).