KR101072189B1 - Method for scheduling a uplink in radio mobile communication system - Google Patents

Abstract

The present invention relates to uplink scheduling in a wireless mobile communication system. In particular, the wireless network controller transmits scheduling information of a terminal to a terminal through a base station, and the terminal determines uplink scheduling using the transmitted scheduling information. It is about.

Base station scheduling, scheduling information, scheduling weight

Description

Uplink scheduling method of wireless mobile communication system {METHOD FOR SCHEDULING A UPLINK IN RADIO MOBILE COMMUNICATION SYSTEM}

1 is a diagram illustrating a process of transmitting a weight determined by an RNC to each UE through a Node B;

2 is a diagram illustrating a process of performing uplink scheduling using a weight provided by an RNC.

The present invention relates to an enhanced uplink dedicated channel (E-DCH) channel of a W-CDMA system, and more particularly, to an uplink scheduling method applicable to an E-DCH channel.

Recently, in accordance with the demand for higher speed of uplink, discussions have been actively made on the application of an uplink channel, that is, an enhanced uplink dedicated channel (E-DCH), in a 3GPP wireless mobile communication system. In particular, uplink scheduling based on a base station (hereinafter referred to as a Node B) forms an important issue of the E-DCH. The E-DCH is a transport channel used when a specific UE wants to transmit high speed uplink data, and is currently being standardized in 3GPP, but details have not been determined.

Conventional uplink scheduling and rate control is performed by a scheduler existing in a radio network controller (RNC). However, the RNC scheduler does not quickly cope with an uplink load change. On the contrary, the Node B scheduler, which is currently discussed in the 3GPP asynchronous standard, adjusts the transmission power and transmission rate of each terminal (hereinafter referred to as UE) by coping with a change in uplink load quickly. Accordingly, the Node B scheduler can operate the noise rise margin of the uplink relatively small by controlling the uplink load quickly to make the change of the uplink load small. This leads to an increase in cell throughput and cell coverage expansion.

Accordingly, the UE performs uplink scheduling (or rate control) by appropriately combining a scheduling request of one particular Node B or scheduling requests from various Node Bs.

As described above, the Node B scheduling scheme replaces the role of the scheduler existing in the existing RNC with the scheduler existing in the Node B. However, since Node B is not currently in charge of allocating and managing radio resources, Node B scheduling is more efficient if Node B knows each UE's location or corresponding path attenuation information and neighbor Node B interference information. Can be done with

In the current asynchronous IMT-2000 system, the above information is not managed by each Node B, but is managed by the RNC controlling several Node Bs. In particular, for UEs in a soft handover situation, the RNC manages path attenuation information of each UE to Node Bs being handed over, so that the amount of interference for neighboring cells generated by the UE can be known more accurately. Therefore, by providing the information from the RNC to the Node, it is necessary to more efficiently manage the ratio of the uplink Rise over Thermal (RoT), that is, the total reception power at the Node B to the thermal noise.

Accordingly, an object of the present invention is to provide a base station-based uplink scheduling method capable of efficiently performing an enhanced uplink dedicated channel (E-DCH).

Another object of the present invention is to provide an uplink scheduling method that can more efficiently manage uplink RoT (Rise over Thermal).

Another object of the present invention is to provide an uplink scheduling method in which a radio network controller informs a terminal of scheduling information of a terminal belonging to each base station through a base station.

In the wireless mobile communication system having an enhanced uplink dedicated channel (E-DCH) to achieve the above object, the wireless network controller informs scheduling information to each terminal belonging to the corresponding base station through each base station. The terminal performs scheduling to be applied to the E-DCH transmission using the corresponding scheduling information.

Advantageously, said scheduling information is a scheduling weight and said scheduling weight is determined at a wireless network controller. The scheduling weight is determined in consideration of the path attenuation of the cell and neighbor cells to which the terminal belongs, the amount of interference, and the service priority of each terminal.

Preferably, the scheduling information is used to determine the transmission probability or the final transmission power (transmission rate) of the terminal.

Preferably, the terminal is characterized in that for performing the E-DCH transmission so that the final transmission probability equals the scheduling weight.

Preferably, when the base station determines the temporary transmission power (transmission rate) of the specific terminal, the terminal determines that the final transmission power (transmission rate) does not exceed scheduling weight x maximum allowable transmission power (transmission rate).

Preferably, when the base station determines the temporary transmission power (transmission rate) of a specific terminal, the terminal performs E-DCH transmission by calculating the final transmission power (transmission rate) to be a scheduling weight x temporary transmission power (transmission rate).

Preferably, when the base station determines the temporary transmission power (transmission rate) of a specific terminal, the terminal has a final transmission power (transmission rate) that does not exceed a scheduling weight x maximum allowable transmission power (transmission rate), and as the temporary transmission power (transmission rate) increases The final transmit power (rate) is determined to be smaller than the temporary allowed transmit power (rate) to perform E-DCH transmission.

In order to achieve the above object, an uplink scheduling method according to the present invention comprises the steps of: transmitting scheduling information from a radio network controller to a terminal through a base station; Determining a final scheduling weight to be applied to uplink channel scheduling by using the transmitted scheduling information in each terminal; And transmitting uplink channel data using the determined final scheduling weight.

Preferably, the uplink channel is an enhanced uplink dedicated channel (E-DCH).

Preferably, the scheduling information is a scheduling weight for the terminal, the final scheduling information is characterized in that the scheduling weight for the channel.

Preferably, the scheduling weight is determined in consideration of the path attenuation of the cell to which the terminal belongs and the neighboring cells, the amount of interference, and the service priority of each terminal.

Preferably, the final scheduling weight is characterized in that the final transmission probability or the final transmission power (transmission rate) of the terminal.

Preferably, the final transmission probability is set equal to the scheduling weight.

Preferably, the final transmission power (transmission rate) is determined not to exceed the scheduling weight x maximum allowable transmission power (transmission rate) when the base station determines the temporary transmission power (transmission rate) of a specific terminal.

Preferably, the final transmission power (transmission rate) is determined to be scheduling weight x temporary transmission power (transmission rate) when the base station determines the temporary transmission power (transmission rate) of a specific terminal.

Preferably, the final transmission power (transmission rate) does not exceed a scheduling weight x maximum allowable transmission power (transmission rate) when the base station determines the temporary transmission power (transmission rate) of a specific terminal. It is characterized in that it is determined to be smaller than the transmission power (transmission rate).

Hereinafter will be described a preferred embodiment of the present invention.

The present invention is implemented in a W-CDMA mobile communication system. However, the present invention can also be applied to communication systems operating according to other standards. Hereinafter, preferred embodiments of the present invention will be described in detail.

According to the present invention, when a Node B scheduling, a radio network controller (RNC) delivers information necessary for scheduling of a UE belonging to each base station (hereinafter referred to as Node B) to the UE through the corresponding Node B, and the UE having received the scheduling information By determining scheduling weight of an uplink channel, a method for more efficiently performing Node B scheduling is proposed. To this end, the present invention uses a method in which the RNC informs each UE belonging to the corresponding Node B through each Node B a scheduling weight value to be applied to the E-DCH transmission. In this case, the Node B may not recognize the weight value assigned to each UE.

The RNC may determine a scheduling weight value for each UE in consideration of path attenuation, uplink interference amount, service priority of each UE, etc. of the cell and neighbor cells to which each UE belongs. For example, a small scheduling weight value may be assigned to a UE that is located near a cell boundary and has a relatively small path attenuation for a neighbor cell, which may cause a large interference to neighbor cells.                     

In addition, the RNC may update and inform the scheduling weight value of each UE through the Node B, if necessary.

Subsequently, a method of receiving a scheduling weight value through Node B and applying a scheduling weight value to each UE will be described below. In this case, there are two methods of applying a scheduling weight value.

In the first way Each UE applies the scheduling weight value transmitted from the RNC to the transmission probability determination. As an example, since the scheduling weight value transmitted from the RNC provides a basis for allowing transmission to a UE, the UE performs final scheduling such that the probability of finally allowing transmission is equal to the scheduling weight.

That is, if a scheduling weight of a UE determined to allow transmission according to any Node B scheduling scheme is 0.7, the UE allows transmission with a probability of 0.7. In this case, the scheduling weight value is a number between 0 and 1, inclusive.

In the second way Each UE applies a scheduling weight value to determine transmit power (rate). For example, when Node B determines the temporary allowable transmit power (transmission rate) for a UE according to an arbitrary scheduling scheme, the UE may determine that the final allowable transmit power (transmission rate) is the scheduling weight × the maximum allowable transmit power (transmission rate). Calculate not to exceed the E-DCH transmission. Here, the maximum allowable transmission power (transmission rate) is a predetermined value for each UE, and the scheduling weight value is a number between 0 and 1, inclusive.

As another example, when Node B determines the temporary allowable transmit power (rate) for a UE according to any scheduling scheme, the UE has a final allowable transmit power (rate) by scheduling weight × temporary allowable transmit power (rate). ) To perform E-DCH transmission scheduling. In this case, the scheduling weight value is a number between 0 and 1, inclusive.

As another example, when Node B determines a temporary allowable transmit power (rate) for a UE according to an arbitrary scheduling scheme, the UE may determine that the final allowable transmit power (rate) is scheduling weight × maximum allowable transmit power (rate). The E-DCH transmission is performed so that the final allowable transmit power (transfer rate) is smaller than the temporary allowable transmit power (transfer rate) as the temporary allowable transmit power (transmission rate) increases.

For example, each UE assumes that the final allowable transmit power (rate) is P _TX = (W-1) x (P _TX '/ P _MAX ) + 1. In this case, P _TX is the final allowable transmission power (transmission rate) for each UE, P _TX 'is the temporary allowable transmission power (transmission rate) for each UE, and W is the scheduling weight for each UE. In addition, P _MAX is the maximum allowable transmission power (rate) for each UE, W is a number from 0 to 1 less.

1 is a diagram illustrating a process of transmitting a weight determined by an RNC to each UE through a Node B. Referring to FIG. In addition, FIG. 2 is a diagram illustrating performing uplink scheduling in each UE using weights transmitted from an RNC through a Node B. FIG.

As shown in Fig. 1 and Fig. 2, the RNC is scheduling information for each UE (UE1, UE2 and UE3), that is, scheduling weight (W _{A, 1} ), (W _{A, 2} ) and (W _{B, 3} ) Next, the scheduling weights W _{A, 1} and W _{A, 2} are transmitted to UE1 and UE2 through Node BA, and the scheduling weights W _{B, 3} are transmitted to UE3 through Node BB. (S11, S12).

Accordingly, each UE (UE1, UE2 and UE3) determines the final scheduling weight (transmission probability and transmission power) according to the above-mentioned formula by using the transmitted scheduling weight (S13), and uses the determined final scheduling weight to upward. Link channel data is transmitted (S14). That is, UE1 and UE2 perform E-DCH transmission at the final allowable transmission rates (P _{TX, 1} ) and (P _{TX, 2} ), respectively, and UE3 performs E-DCH transmission at the final allowed transmission rates (P _{TX, 3} ). do.

In this case, the scheduling information is a scheduling weight for the terminal, and the final scheduling information is a scheduling weight for the channel.

As described above, the present invention can perform Node B scheduling more efficiently by determining a scheduling weight in the terminal using information transmitted from the radio network controller through the base station.

In particular, the present invention can more effectively control the uplink noise rise by reflecting information managed by the radio network controller in Node B scheduling, such as the degree of interference of neighboring cells of each terminal, the amount of interference of each cell, and the like. Can be.

In addition, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (19)

In a wireless mobile communication system having an enhanced uplink dedicated channel (E-DCH), In this case, the radio network controller informs scheduling information to be applied to E-DCH transmission to respective terminals belonging to the corresponding base station through each base station. The scheduling information is Used to determine the final transmission probability or final transmission power (transmission rate) of the terminal, The final transmission power (rate) is If the base station determines the temporary transmission power (transmission rate) of a specific terminal, the uplink scheduling method characterized in that it does not exceed the value multiplied by the scheduling weight and the maximum transmission power (transmission rate). The method of claim 1, wherein the scheduling information Uplink scheduling method characterized in that the scheduling weight. The method of claim 2, wherein the scheduling weight is The uplink scheduling method is determined by the radio network controller, and is determined in consideration of the path attenuation, the degree of interference, and the service priority of each terminal. delete The method of claim 1, wherein the final transmission probability Uplink scheduling method, characterized in that the scheduling weight is set equal to. delete The method of claim 1, wherein the final transmission power (transmission rate) is If the base station determines the temporary transmission power (rate) of the specific terminal, the uplink scheduling method characterized in that the value multiplied by the scheduling weight and the temporary transmission power (rate). The method of claim 1, wherein the final transmission power (transmission rate) is When the base station determines the temporary transmission power (transmission rate) of a specific terminal, it does not exceed the value obtained by multiplying the scheduling weight by the maximum transmission power (transmission rate), and the larger the temporary transmission power (transmission rate) is smaller than the temporary transmission power. Uplink scheduling method characterized in that it is determined to have. The method of claim 8, wherein the final transmission power (transmission rate) is Uplink scheduling method characterized in that determined according to the following equation. P _TX = (W-1) × (P _TX '/ P _MAX ) + 1 Here, P _TX is the final transmission power (transmission rate) of each UE, P _TX 'is the temporary transmission power (transmission rate) of each UE, W is the scheduling weight of each UE, P _MAX is the maximum transmission power (transmission rate) of each UE )to be. Transmitting scheduling information from the radio network controller to the terminal through the base station; Determining a final scheduling weight for uplink channel scheduling in the terminal by using the transmitted scheduling information, wherein The final scheduling weight is The final transmission probability or final transmission power (transmission rate) of the terminal, The final transmission power (rate) is If the base station determines the temporary transmission power (transmission rate) of the specific terminal, it is determined not to exceed the value multiplied by the scheduling weight and the maximum transmission power (transmission rate). The uplink scheduling method of claim 10, further comprising transmitting uplink channel data using the determined final scheduling weight. The method of claim 10, wherein the uplink channel is Uplink scheduling method characterized in that the enhanced uplink dedicated channel (E-DCH). The method of claim 10, wherein the scheduling information The scheduling weight for the terminal, the last scheduling information is scheduling scheduling for the uplink, characterized in that the scheduling weight for the channel. The method of claim 13, wherein the scheduling weight is The uplink scheduling method characterized in that it is determined in consideration of the path attenuation of the cell and the neighboring cells, the amount of interference, and the service priority of each terminal. delete 11. The method of claim 10, wherein the final transmission probability is The uplink scheduling method as set to the same as the scheduling weight. delete The method of claim 10, wherein the final transmission power (transmission rate) is If the base station determines the temporary transmission power (rate) of the specific terminal, the uplink scheduling method characterized in that it is determined to be a value multiplied by the scheduling weight and the temporary transmission power (rate). The method of claim 10, wherein the final transmission power (transmission rate) is When the base station determines the temporary transmission power (transmission rate) of a specific terminal, it does not exceed a value obtained by multiplying the scheduling weight by the maximum transmission power (transmission rate), and the larger the temporary transmission power (transmission rate) is greater than the temporary transmission power (transmission rate) Uplink scheduling method characterized in that it is determined to be small.

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