KR100866348B1 - Method and apparatus for scheduling of mobile station in soft handoff area for uplink packet transmission - Google Patents

Abstract

The present invention relates to a scheduling method of a base station for controlling an efficient reverse traffic rate of terminals located in a soft handover region and a signaling method therefor. The active combination of terminals located in the soft handover area includes an optimal base station and a plurality of non-optimal base stations. The terminal receives and combines the scheduling permission indicators according to the common scheduling from the non-optimal base stations, and when the combined scheduling permission indicator means a lowering rate or a selective lowering rate, a predetermined probability, a current reverse rate, a class of service, Or, it is determined whether or not to reduce or maintain the maximum transmission rate according to the control signaling of the network or to follow the dedicated scheduling allocation information from the optimal base station.

WCDMA, UPLINK ENHANCEMENTS, SOFT HANDOVER, E-DCH, NODE B CONTROL SCHEDULING, COMMON SCHEDULING ASSIGNMENT, DESIGNATED SCHEDULING ASSIGNMENT

Description

FIELD OF THE INVENTION A scheduling method and apparatus for soft handover terminals in reverse packet transmission.

1 is a diagram illustrating a radio access network (UTRAN) of a UMTS system.

2 is a hierarchical diagram illustrating an interface between a terminal and a radio network controller (RNC).

3 is a conceptual diagram illustrating transmission of data over an E-DCH in a typical radio link.

4 is a message flow diagram illustrating a transmission and reception procedure through an E-DCH.

5 is a diagram for explaining a rate scheduling method.

6 illustrates a time-rate scheduling method.

7 is a diagram illustrating E-DCH transmission of a UE located in a soft handover region.

8 is a diagram illustrating a common scheduling allocation method of a non-optimal base station according to a preferred embodiment of the present invention.

9 is a diagram illustrating a structure of a terminal receiving scheduling allocation information according to an exemplary embodiment of the present invention.

10 illustrates an example of determining a joint scheduling allowance value according to a preferred embodiment of the present invention.

The present invention relates to asynchronous wideband code division multiple access (WCDMA) communication. In particular, the present invention relates to efficient scheduling when a terminal located in a soft handover region uses an enhanced dedicated channel for reverse packet transmission. It relates to a method and an apparatus for enabling this.

Third generation, based on the European mobile system Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), and using Wideband Code Division Multiple Access (CDMA) UMTS (Universal Mobile Telecommunication Service) system, a mobile communication system, is a consistent service that enables mobile phone or computer users to transmit packet-based text, digitized voice or video, and multimedia data at high speeds of 2 Mbps or more anywhere in the world. To provide. UMTS uses the concept of virtual access, which is a packet-switched connection that uses a packet protocol such as Internet Protocol (IP), and can always be connected to any other end in the network.

FIG. 1 is a diagram illustrating a UMTS Terrestrial Radio Access Network (hereinafter referred to as UTRAN) of a UMTS system.

Referring to FIG. 1, the UTRAN 12 is composed of radio network controllers (hereinafter referred to as RNCs) 16a and 16b and Node B's 18a, 18b, 18c, and 18d. Then, the user equipment (hereinafter referred to as UE) 20 is connected to the core network 10. There may be a plurality of cells below the node Bs 18a, 18b, 18c, and 18d, and each RNC 16a, 16b controls the corresponding node Bs 18a, 18b, 18c, and 18d. Each node B 18a, 18b, 18c, and 18d controls corresponding lower cells. One RNC and Node Bs and cells controlled by the RNC are collectively referred to as a Radio Network Subsystem (hereinafter referred to as RNS) 14a and 14b.

The RNCs 16a and 16b allocate or manage radio resources of the Node Bs 18a to 18d that they control. Node Bs 18a through 18d provide actual radio resources. Radio resources are configured for each cell, and radio resources provided by the Node Bs 18a to 18d mean radio resources of cells managed by the Bs. The terminal 20 may configure a radio channel and perform communication using radio resources provided by a specific cell of a specific Node B. From the standpoint of the terminal 20, the distinction between the Node Bs 18a to 18d and the corresponding cells is meaningless, and since only the physical layer configured for each cell is recognized, the Node Bs 8a to 18d and the cells have the same meaning. Will be mentioned.

The interface between the terminal 20 and the RNCs 16a and 16b is called a Uu interface, and a detailed hierarchical structure is shown in FIG. 2. The Uu interface is divided into a control plane used to exchange control signals between the terminal and the RNC and a user plane used to transmit actual data.

Referring to FIG. 2, the control plane signal 30 includes a radio resource control (RRC) layer 32, a radio link control (RLC) layer 40, a media access control (MAC) layer 42, and physical (physical) signals. The user plane information 32 is processed through a Packet Data Control Protocol (PDCP) layer 36, a Broadcast / Multicast Control (BMC) layer 38, and an RLC layer 40. ), The MAC layer 42, and the physical layer 44. Among the layers shown here, the physical layer 44 is located in each cell, and the MAC layer 42 to the RRC layer 34 are located in the RNC.

The physical layer 44 is a layer that provides an information transmission service using a radio transfer technology, and corresponds to a first layer of an Open Systems Interconnection (OSI) model. The physical layer 44 and the MAC layer 42 are connected by transport channels, and transport channels are defined by the manner in which specific data is processed in the physical layer.

The MAC layer 42 and the RLC layer 40 are connected via logical channels. The MAC layer 42 delivers the data delivered by the RLC layer 40 through the logical channel to the physical layer through the appropriate transport channel, and the data delivered by the physical layer 44 through the transport channel through the appropriate logical channel. It serves to convey to 40. In addition, by inserting additional information into the data received through the logical channel or the transmission channel or by analyzing the inserted additional information, it takes appropriate action and controls the random access operation. The part related to the user terminal 30 in this MAC layer 42 is called MAC-d, and the part related to the control terminal 32 is called MAC-c.

The RLC layer 40 is responsible for establishing and releasing logical channels. The RLC layer 40 may operate in one of three operation modes such as an acknowledgment mode (AM), an unacknowledged mode (UM), and a transparent mode (TM), and provide different functions for each operation mode. In general, the RLC layer 40 is responsible for dividing or assembling a service data unit (hereinafter referred to as SDU) from an upper layer into an appropriate size, and an error correction function.

The PDCP layer 36 is located above the RLC layer 40 in the user terminal 32, and functions to compress and restore headers of data transmitted in the form of IP packets, and provides a service to a specific terminal with mobility. It is responsible for the lossless transfer of data, etc. under the situation that is changed.

The characteristics of transport channels connecting the physical layer 44 and upper layers define physical layer processing such as convolutional channel encoding, interleaving and service-specific rate matching. It is determined by the transport format (TF).

In particular, in the UMTS system, an enhanced uplink dedicated channel is further improved to further improve the performance of packet transmission in uplink (UL) communication from a user equipment (UE) to a base station (BS). : Hereinafter referred to as E-DCH). The E-DCH supports technologies such as Hybrid Automatic Retransmission Request (HARQ) and Node B controlled scheduling to support more stable high-speed data transmission. The processing of the E-DCH is performed by the MAC-e layer which exists below the MAC-d layer, and the MAC-e layer adds control information to the E-DCH data to provide MAC-enhanced Protocol (MAC-enhanced Protocol). Data Unit).

3 is a conceptual diagram illustrating transmission of reverse packet data through an E-DCH in a wireless reverse link.

Referring to FIG. 3, reference numeral 100 denotes a Node B supporting an E-DCH, and reference numerals 101, 102, 103, and 104 are terminals transmitting E-DCHs (111, 112, 113, and 114). . The node B 100 determines the channel status of the terminals 101 to 104 using the E-DCH and schedules data transmission of the terminals 101 to 104. The scheduling assigns a low data rate to the terminal 104 far from the Node B 100 while maintaining the measured RoT (Rise Over Thermal) value of the Node B in order to increase the performance of the entire system. The terminal 101 is performed by assigning a high data rate.

4 is a message flow diagram illustrating a transmission and reception procedure through an E-DCH.

Referring to FIG. 4, in step 202, the Node B and the UE configure an E-DCH. The configuration process 202 includes the delivery of messages over a dedicated transport channel. When the E-DCH is configured, the UE informs the Node B of the scheduling information in step 204. The scheduling information may include terminal transmission power information indicating reverse channel information, extra power information that can be transmitted by the terminal, and an amount of data to be transmitted in a buffer of the terminal.                         

Receiving scheduling information from a plurality of terminals in communication, the Node B monitors scheduling information of the plurality of terminals in step 206 to schedule data transmission of each terminal. Specifically, in step 208, the Node B determines to allow reverse packet transmission to the terminal and transmits scheduling assignment information to the terminal. The scheduling allocation information includes the maximum data rate allowed and the transmission permission timing.

The UE determines a transport format (TF) of the E-DCH to be transmitted in the reverse direction by using the scheduling assignment information in step 210, and transmits reverse (UL) packet data through the E-DCH in step 212. At the same time, the TF information is transmitted to the Node B. In step 216, the Node B determines whether there is an error in the TF information and the packet data. In step 218, the node B receives a non-acknowledge (NACK) when an error occurs in any one of the determination results, and receives an acknowledgment (ACK) when all errors are found through the ACK / NACK channel. Send to the terminal.

When the ACK is transmitted, the terminal transmits new user data through the E-DCH when packet data is completed, but when the NACK is transmitted, the terminal retransmits the same packet data through the E-DCH.

Since the E-DCH is an enhanced channel for uplink packet transmission, the E-DCH has basic characteristics of a dedicated channel, one of which is soft handover support. The UE in the soft handover area may receive forward information from all of the base stations belonging to the active set. Accordingly, the terminal located in the soft handover area receives scheduling allocation information from all of the base stations belonging to the active set in order to transmit the E-DCH. As a result, since the terminal receives different scheduling allocation information from the base stations belonging to the activity set, it is necessary to actually determine whether to transmit the E-DCH according to the different scheduling allocation information.

Accordingly, in a communication system supporting the E-DCH according to the prior art, in scheduling a terminal in a soft handover area, all base stations belonging to the activity set transmit scheduling allocation information for each terminal, thereby transmitting code resource or transmission power of a forward channel. There is an overhead problem in terms of resources, and it is difficult for a terminal receiving the plurality of scheduling allocation information to determine transmission of an E-DCH.

Accordingly, the present invention, which was devised to solve the problems of the prior art operating as described above, provides a method and apparatus for scheduling an enhanced reverse transport channel (E-DCH) for terminals located in a soft handover area in an asynchronous WCDMA communication system. to provide.

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The present invention provides a method and apparatus for determining a transmission rate of reverse packet transmission by using scheduling information received from base stations included in an activity set by a terminal located in a soft handover area.

According to a preferred embodiment of the present invention, there is provided a scheduling method for a user terminal in soft handover in a mobile communication system supporting enhanced reverse packet data service.

Receiving, by the soft handover, a user terminal communicating with one optimal base station and at least one non-optimal base station from the optimal base station with dedicated scheduling allocation information according to the dedicated scheduling assignment;

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Receiving, by the user terminal, at least one scheduling permission indicator according to a common scheduling assignment from the at least one non-optimal base station;

Determining a combined scheduling permission indicator by combining at least one scheduling permission indicator received from the at least one non-optimal base station;
Determining whether to use the combined scheduling permission indicator according to a predetermined criterion;

And determining the maximum transmission rate of the reverse link according to the dedicated scheduling allocation information or the combined scheduling permission indicator.
An apparatus according to a preferred embodiment of the present invention is a scheduling receiving apparatus of a user terminal in soft handover in a mobile communication system supporting an enhanced reverse packet data service.
A receiving unit for receiving dedicated scheduling allocation information according to a dedicated scheduling assignment from an optimal base station and receiving at least one scheduling permission indicator according to a common scheduling assignment from at least one non-optimal base station;
A first scheduling determiner that combines at least one scheduling permission indicator received from the at least one non-optimal base station to determine a combined scheduling permission indicator;
A second scheduling determiner determining whether to use the combined scheduling permission indicator according to a predetermined criterion, and determining the maximum transmission rate of the reverse link according to the dedicated scheduling allocation information or the combined scheduling permission indicator;
And a transmission format determiner for determining the transmission format of the reverse link within the maximum transmission rate.

Hereinafter, the operating principle 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. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The main subject of the present invention to be described later is to clearly determine the E-DCH transmission format, while reducing the generation of the forward signaling information for scheduling of the terminal located in the soft handover area in the advanced reverse packet data service, the reverse resource management aspects It is about the optimal scheduling technique to enable more efficient scheduling in. The present invention also proposes a scheduling technique by a base station (hereinafter referred to as a non-optimal base station) other than the optimal scheduling base station (hereinafter referred to as optimal base station) which is included in the activity combination. In addition, the present invention provides a method for a terminal located in a soft handover region to receive and interpret scheduling allocation information of the optimal base station and scheduling allocation information of non-optimal base stations.

As a scheduling method for reverse packet transmission, various methods may be used. Rate scheduling and time and rate scheduling are described as representative scheduling methods. Rate scheduling is a method in which the base station controls the transmission rate of each terminal step by step, and time-rate scheduling is a method in which the base station simultaneously controls the time and transmission rate of the reverse packet transmission. The following two scheduling methods will be described.

5 is a diagram illustrating transmission of control information in a reverse direction and a forward direction for transmission rate scheduling and transmission of a reverse packet.

Referring to FIG. 5, the terminal 502 is transmitting rate request information 505 and E-DCH data 506, and the base station 501 is allowed the maximum rate allowed by the terminal through scheduling. Rate grant (RG) information 503 indicating a max rate is being transmitted. The rate permission information 503 may indicate one of 'UP', 'DOWN', and 'KEEP'.

The terminal 502 determines how much data is in the buffer to be sent in the reverse direction, and also checks the power surplus value that the terminal 502 can transmit to the base station 501 through the transmission rate request information 505 indicating a desired transmission rate. ) To increase or decrease the data rate. The base station 501 that receives the rate request information 505 increases the maximum rate of the terminal 502 by combining the rate request information of the terminal 502 and other terminals managed by the base station 501. Whether to UP, DOWN, or KEEP is determined using the rate allowance information 503.

5, the terminal 502 requests a rate increase using the rate request information 507 in step 508. After receiving the rate request information 507, the base station 501 performs scheduling in step 510 and instructs the terminal 502 to increase the rate using the rate allowed information 509. Accordingly, the terminal 502 can transmit the reverse packet in the next section 512 at a rate 11 (512), which is a step up from the previous rate 10 (511).

In the rate scheduling described above, the base station and the terminal have information on transmission rates that the terminal can use. The information about the transmission rates is represented by a transport block combination (hereinafter referred to as "TBC") indicating a transport block size (hereinafter referred to as "TBS") used in the WCDMA scheme. Can be broken.

6 is a diagram illustrating transmission of uplink and forward control information and transmission of uplink packets for time-rate scheduling.

Referring to FIG. 6, the terminal 603 transmits terminal state information 604 including the data amount and transmission power of the data buffer to the base station 601 periodically or in an event-triggered manner. The base station 601 determines the maximum transmission rate of the terminal 603 to be used during the next section through scheduling with reference to the terminal state information 604, and scheduling allocation information (SA) 602 based on the determined maximum transmission rate. ) To notify the terminal 603. Accordingly, the terminal 603 receives the scheduling allocation information 602 and transmits the E-DCH data 605 in the reverse direction for a predetermined time interval within the maximum transmission rate indicated by the scheduling allocation information 602.

For example, initially, the terminal 603 uses a transmission rate 1 610 for transmission of the E-DCH data 605. When the terminal 603 transmits the terminal state information 611 to the base station 601 in step 621, the base station 601 performs scheduling to allow the terminal 603 to allow E-DCH transmission during the next interval. In the case of allowing transmission, the transmission rate to be allowed to the terminal 603 and the time information allowed for transmission are determined. The base station 601 transmits allocation time information and allocation rate information to the terminal 603 using the scheduling allocation information 631 in step 641. Upon receipt of the scheduling allocation information 631, the terminal 603 transmits E-DCH data according to a predetermined transmission rate 10 651 during a time interval based on the scheduling allocation information 631. On the other hand, when the base station 601 does not allocate a time interval to the terminal 603 as shown by reference numeral 630, the terminal 603 uses E-DCH data using a transmission rate 1 (650), which is a minimum set. send.

In case of using the rate scheduling method and time-rate scheduling at the same time, in general, the rate scheduling using the rate tolerance information is used, and when a sudden change in the rate such as the occurrence or exhaustion of data or a sudden change in the channel condition is necessary, It is also possible to use time-rate scheduling using scheduling assignment information.

7 illustrates an operation of a terminal located in a soft handover area to perform an enhanced reverse packet data service.

In FIG. 7, the terminals 703, 706, and 710 may transmit E-DCH data. The terminal 710 is located in the soft handover area and the base stations 701 and 702 related to the soft handover area are included in the activity set of the terminal 710. The terminals 703 and 706 do not belong to the soft handover area and communicate only with the respective base stations 701 and 702. The terminal 703 receives the scheduling assignment information 704 from the base station 701 and transmits the E-DCH data 705. Similarly, the terminal 706 receives the scheduling assignment information 707 from the base station 702 and transmits the E-DCH data 708.

The terminal 710 belonging to the soft handover area has all of the base stations 701 and 702 in the activity combination, and receives the scheduling from the base stations 701 and 702. The base stations 701 and 702 belonging to the activity combination of the terminal 710 may perform scheduling with respect to the terminal 710 in the same manner. More preferably, the base stations 701 and 702 may perform scheduling with different scheduling rights with respect to the terminal 710. At this time, the base station having the maximum scheduling authority for the terminal 710 becomes an optimal base station (serving node B) of the terminal 710.

One optimal base station among the tkdrl base stations 701 and 702 belonging to the terminal 710 dmf dnlgo activity combination is determined. For example, the base station which is most affected by reception noise in terms of transmitting E-DCH data in the reverse direction by the terminal 710 may be defined as an optimal base station. In general, a base station closest to the terminal 710, a reverse channel situation, or a base station having a good forward channel condition or one base station having a margin in a reverse resource is defined as an optimal base station.

In FIG. 7, the base station 701 is an optimal base station of the terminal 710, and the base station 702 is a non-optimal base station. The terminal 710 receives both signals 711 and 713 transmitted from the optimal base station 701 and the non-optimal base station 702, and the optimal base station 701 and the non-optimal base station 702 are also transmitted by the terminal 710. Receive signals 712 and 714).

When both the optimal base station 701 and the non-optimal base station 702 send the scheduling allocation information to all terminals including themselves in the activity combination through dedicated signaling, the transmission power, the code resource, etc. due to the forward signaling Consumption inevitably increases. Therefore, in this case, the base stations 701 and 702 may have problems such as insufficient transmission power or insufficient channel codes. In particular, when the terminal 710 belonging to the soft handover area communicates with two or more base stations 701 and 702 included in the activity combination, the forward signaling information also requires very large forward signal strength due to its characteristics. Therefore, the problem concerning the consumption of the transmission power and the code resources described above becomes more serious.

As a method for solving this problem, the scheduling allocation method proposed in the preferred embodiment of the present invention will be described with reference to FIG.

In FIG. 7, the optimal base station 701 has higher authority than the non-optimal base station 702 in scheduling the terminal 710. That is, the optimal base station 701 can schedule the terminal 710 in a more detailed and accurate manner, and the non-optimal base station 702 can only schedule roughly the terminal 710 compared to the optimal base station 701. It is possible. Accordingly, the optimal base station 701 performs dedicated scheduling for the terminal 710, and the non-optimal base station 702 performs common scheduling with other terminals for the terminal 710. To perform. This common scheduling allocation method can reduce forward resource consumption and solve a problem of transmission power or code resource shortage of the non-optimal base station 702.

8 is a diagram illustrating a common scheduling allocation operation of the base stations according to a preferred embodiment of the present invention in detail.

Referring to FIG. 8, the first and second terminals UE1 and UE2 804 and 805 are located in the soft handover area. The first terminal 804 manages an activity combination including first to third base stations Node B1, Node B2, and Node B3 801, 802, 803, and the first base station 801 is the first terminal 804. Is the optimal base station. The second terminal 805 manages an activity combination comprising second and third base stations 802 and 803, and the third base station 803 is the optimal base station of the second terminal 805. In the scheduling of the E-DCH, the optimal base stations 801 and 803 each use a dedicated signal to schedule each terminal, and the non-optimal base stations schedule the terminals at the same time using common signaling. In this case, rate scheduling or time-rate scheduling may be used, or both scheduling methods may be used. That is, the first base station 801 transmits dedicated scheduling allocation information 806 to the first terminal 804, and the third base station 803 also transmits dedicated scheduling allocation information 807 to the second terminal 805. do.

On the other hand, since the second base station 802 is a non-optimal base station for both the terminal 804 and the terminal 805, the second base station 802 commonly schedules the terminals 804 and 805 using one common scheduling assignment information 808. That is, the second base station 802 forwards the common scheduling assignment information 808 in the forward direction for the terminals 804 and 805 which have included the second base station 802 in the activity combination and set the non-optimal base station. The common scheduling assignment information 808 indicates the maximum transmission rate of the reverse link for all of the terminals 804 and 805. Terminals 804 and 805 receive common scheduling assignment information 808 transmitted from the second base station 802.

Since the first terminal 804 sets the third base station 803 as the non-optimal base station, the first terminal 804 receives the common scheduling allocation information 809 transmitted from the third base station 803. The common scheduling allocation information 809 transmitted from the third base station 803 is included in addition to the first terminal 804 together with other terminals including the third base station 803 in an activity combination and configured as non-optimal base stations. Information that should be received in common. As described above, the terminals receiving the scheduling allocation information from one or more base stations combine the one or more dedicated and common scheduling allocation information to determine the transmission format of the E-DCH that each terminal can transmit.

As described above, the UE located in the soft handover area receives dedicated scheduling allocation information from the optimal base station and common scheduling allocation information from the non-optimal base station, and the terminal combines the two or more scheduling allocation information to transmit the E-DCH transmission format. Determine. Hereinafter, a method in which a terminal uses common scheduling allocation information of a non-optimal base station and a method in which a terminal located in a soft handover region interprets two or more scheduling allocation information will be described in detail.

<< first embodiment >>

According to the first embodiment, the non-optimal base station performs common scheduling using two levels. The optimal base station performs independent dedicated scheduling for the terminals, and the non-optimal base station performs one common scheduling for several terminals. That is, the optimal base station simultaneously uses either or both of rate scheduling and time-rate scheduling for dedicated scheduling allocation, and in other cases, other possible scheduling methods. On the other hand, the non-optimal base station uses a scheduling grant indicator of 1 bit according to rate scheduling for common scheduling. As described above, when the 1-bit scheduling allowance indicator is used as the common scheduling allocation information, it is possible to save consumed base station transmission power and channel code resources.

As an example, two levels represented by the 1-bit scheduling allowance indicator indicate a down signal ("DOWN") and an ignore signal ("Don't Care"), respectively. The scheduling enable indicator of 1 bit means a down signal when the real value +1 on the physical channel, and the ignore signal when the real value -1 on the physical channel. In other cases, the real values have the opposite meaning to the above case.

The real values of the scheduling permission indicator may be mapped in consideration of the occurrence frequency of the down signal and the occurrence frequency of the disregard signal. That is, when a signal predicted to occur frequently is mapped to a real value 0 that uses a method of discontinuous transmission (DTX) on a physical channel, transmission of the signal saves power consumed in the physical channel. Benefits may be gained in terms of power and noise reduction. Here, DTX substantially means non-transmission in the corresponding section. For example, if the ignore signal is generated more frequently on average than the down signal, the ignore signal is mapped to real value 0 on the physical channel, and the down signal is mapped to real value 1 (or -1) on the physical channel. To transmit. In this case, the receiver distinguishes the two signals using a non-zero reference value.

The common scheduling allocation method performed by the non-optimal base station is as follows.

The base station manages the reverse resource by measuring the reception strength of the terminals included in the service area of the base station in the scheduling. In this case, when the reception strength of the terminals for which the base station is set as the non-optimal base station is very large, and has a great influence on the terminals having the base station as the optimal base station or a terminal including only the base station in an activity combination, the base station is configured to perform the above-mentioned operation. A scheduling allow indicator for all terminals or terminals configured as themselves non-optimal base stations is set as a down signal. On the contrary, if the reception strength does not significantly affect the base station and there is room in the reverse resource of the base station, the base station sets the scheduling permission indicator for the terminals as a disregard signal.

The structure of the terminal for the first embodiment is shown in FIG. The terminal is located in the soft handover area and has one optimal base station and one or more non-optimal base stations.

Referring to FIG. 9, the terminal receives dedicated scheduling allocation information 901 from the optimal base station. Here, the dedicated scheduling assignment information 901 is a rate grant (RG) signal when a rate scheduling method is used, and a scheduling assignment (SA) signal when a time-rate scheduling method is used. When both methods are used, a combination of a rate permission signal and a scheduling assignment signal is obtained. The terminal also receives n scheduling allowance values 902 to 903 from n non-optimal base stations (where n is an integer greater than or equal to 1). Here, the scheduling permission value means a real value of the scheduling permission indicator. The scheduling allow combining function executor 904 for the non-optimal base stations combines the n scheduling allow values 902 to 903 to determine one combined scheduling allowance value 905. The operation of the scheduling permission combining function executor 904 will be described in detail below.

The combined scheduling allowance value 905 found from the n scheduling allowance values 902 to 903 is input to a scheduling decision function 906 along with dedicated scheduling assignment information 901 received from the best base station, and a scheduling decision function. Operation of the executor 706 The terminal determines the final scheduling allocation value necessary for determining the format of the E-DCH and the terminal uses the scheduling allocation value determined by the scheduling determination function 906 to use the E-DCH for backward transmission. Determine the DCH format 907. The scheduling decision function 906 will also be described in detail later.

The scheduling allow combining function executor 904 of FIG. 9 is capable of the following operations when the number of non-optimal base stations is greater than two.

As a first example, the scheduling allow combining function executor 904 determines the combined scheduling allowance value 905 of non-optimal base stations as a falling signal if any one of the scheduling allow values received by the terminal indicates a falling signal. That is, the terminal determines the combined scheduling allowance value 905 of the non-optimal base stations as the disregard signal only when all scheduling allowance values indicate the disregard signal. Otherwise, the terminal determines the disregard signal.

As another example, the scheduling allow combining function executor 904 combines scheduling allowance values of non-optimal base stations using a weighted sum. The weight sum is to use a weight value set for each non-optimal base station. The structure of the scheduling allow combining function executor 904 for weighted sum combining of the scheduling allowance values is described in detail in FIG. 10.

Referring to FIG. 10, when n scheduling allowance values 1001, 1002, and 1003 are received from n non-optimal base stations, the scheduling allowance values 1001 to 1003 are respectively assigned weight values 1005, 1007, and 1009. And multiplied by multipliers 1006, 1008, 1010 and then summed by summer 1011. The weight value determined for each non-optimal base station may be set in a network such as an RNC according to a cell type to inform the terminal, or the terminal may be internally set according to a channel condition between base stations.

That is, the scheduling allowance value 1001 received at the first non-optimal base station is multiplied by the weight value 1005 set for the first non-optimal base station at the multiplier 1006 and input to the summer 1011, and the second non-optimal base station. The scheduling allowance value 1002 received at the optimal base station is multiplied by the weight value 1007 set for the second non-optimal base station in the multiplier 1008 and input to the summer 1011, and received at the last nth non-optimal base station. The scheduled scheduling value 1003 is multiplied by the weight value Wn 1009 set for the nth non-optimal base station in the multiplier 1010 and input to the summer 1011. In this way, the scheduling allowance values 1001-1003 received at all non-optimal base stations are multiplied by the corresponding weights 1005-1009, respectively, and input to the summer 1011.

Summer 1011 adds the scheduling allowance values multiplied by the weights 1005-1009 to produce one weighted sum value. The joint scheduling allowance value generator 1012 then determines the joint scheduling allowance value 905 according to the weighted sum value. For example, the joint scheduling allowance value generator 1012 determines the joint scheduling allowance value 905 according to a result of comparing the weighted sum value with a predetermined reference value. If the scheduling permission indicator has a real value of +1, it means a down signal, and if it has a real value of -1, it means a disregard signal, the reference value is '0'. Therefore, when the weighted sum value is greater than or equal to 0, the combined scheduling allowance value 905 is determined as a down signal, and when the weighted sum value is less than 0, the combined scheduling allowance value 905 is determined as an ignore signal. do. As another example, if the falling signal is a real value 0 and the ignore signal is a real value +1 (or -1), the reference value will be '0.5' (or '-0.5').

The scheduling determination function executor 906 of FIG. 9 may determine the transmission format of the E-DCH to be transmitted by the terminal by receiving the combined scheduling allowance value 905 determined above and the dedicated scheduling allocation information of the optimal base station received by the terminal. The scheduling assignment value 908 is outputted so that it is. When the combined scheduling allowance value 905 means 'Don't care', even if the E-DCH transmission format of the UE is changed to some extent, the non-optimal BSs of the UE are not significantly affected by the use of reverse resources. Do not. Accordingly, the terminal determines the transmission format of the E-DCH according to the dedicated scheduling allocation information 901 transmitted by the optimal base station.

On the other hand, when the combined scheduling allowance value 905 means 'DOWN', it means that the E-DCH transmission of the UE acts as a burden on the reverse resource use of the non-optimal base station. The 'DOWN' means a command to lower the transmission rate by one step when the rate scheduling is used in the E-DCH transmission, and the command to limit the transmission of the E-DCH when the time-rate scheduling is used. it means.

In this case, if all terminals located in the soft handover region determine the transmission format of the E-DCH by lowering the transmission rate of the E-DCH by one step according to the 'down' signal, or limit the transmission itself, individual situations of the terminals are considered. As a result, they are less efficient in terms of system performance and fairness. Therefore, the following methods of descending may be used as a method for passing this.

In the first method, a stochastic 'falling' decision method is used. If the probability randomly generated is greater than or equal to a predetermined value, the terminal follows the 'falling down' determination of the combined scheduling allowance value 905 through the probability test, otherwise, the terminal determines the 'single' of the combined scheduling allowance value 905. Ignore the decision. When the combined scheduling allowance value determined as 'falling' is ignored, the terminal uses the previous frame format as it is in determining the format of the E-DCH, or follows dedicated scheduling allocation information 901 of the optimal base station.

In the second method, when rate scheduling is used, it is determined whether or not to accept the 'down' decision according to the transmission rate of the terminal currently being used. The terminal has a rate threshold. If the transmission rate of the currently transmitting E-DCH becomes greater than or equal to the threshold, since the non-optimal base station may be greatly influenced by the E-DCH transmission of the terminal, the terminal may be determined as' Follow the decision. On the other hand, when the transmission rate of the currently transmitted E-DCH is smaller than the threshold, since the non-optimal base station is not significantly affected by the E-DCH transmission of the terminal, the terminal is 'down' of the combined scheduling allowance value 905 Either maintain the transmission rate of the previous frame without following the decision, or follow dedicated scheduling allocation information 901 of the optimal base station.

In a third method, it is determined whether to accept the 'down' decision according to the service level of the E-DCH of the UE. The terminal providing the E-DCH service may be initially given a grade, which indicates the quality of the E-DCH service of the terminal. The criteria for dividing the rating may be charging or channel status of the terminal user.                     

As an example, the relatively higher terminal uses the dedicated scheduling allocation information 901 of the optimal base station regardless of receiving the 'down' signal, and the relatively lower terminal depends on whether the 'down' signal is received. Lower the E-DCH rate by one step. As another example, the terminal has a different probability threshold according to the class, and when the probability randomly generated by the probabilistic test is greater than the probability threshold, the UE follows the 'falling down' determination of the combined scheduling allowance value 905. Ignore the 'down' determination of the combined scheduling allowance value. When the combined scheduling allowance value is ignored, the UE uses the previous frame format as it is in determining the format of the E-DCH or follows dedicated scheduling allocation information 901 of the optimal base station.

The class information of each terminal may also be transmitted to the base station, which may be directly transmitted to the base station by the network or the terminal during the channel setting process with the initial terminal. When the base station knows the class of the terminal, the scheduling allocation information may be selected by predicting how much of the terminals located in the soft handover region to follow the scheduling allocation information of the base station.

In a fourth method, the UE receiving the E-DCH is separately signaled from the RNC by the method of interpreting the down signals of the non-optimal base stations. That is, the RNC informs each UE of a method of interpreting a 'down' signal from non-optimal BSs during soft handover, that is, a scheduling decision function using RRC signaling, and the UE uses the RNC signaling information to inform the UE of the E-DCH. Determine the transmission rate of.

For example, the RNC informs the scheduling determination function of 1 and 0 according to the state of the terminal. The UE signaled with 1 uses dedicated scheduling allocation information 901 of the optimal base station regardless of the reception of the 'down' signal, while the UE signaled with '0' according to the reception of the 'down' signal. Lower the transmission rate by one step. As another example, the RNC signals each terminal a threshold used for probability test of the soft handover region. Accordingly, when the non-optimal base station transmits the 'down' signal, if the probability randomly generated by the probabilistic test is larger than the threshold, the terminal follows the 'down' determination of the combined scheduling allowance value 905. Ignores the 'down' determination of the combined scheduling allowance value 905. If the combined scheduling allowance value 905 is ignored, the UE uses the previous frame format as it is in determining the format of the E-DCH or uses dedicated scheduling allocation information 901 of the optimal base station.

The RNC can also perform scheduling of the base station more efficiently by transmitting signaling information transmitted to the terminal to the base station. That is, the base station knows how to interpret when the terminals receive a 'down' signal from the non-optimal base station during soft handover, and how much of the terminals located in the soft handover area will follow the scheduling allocation information of the base station. Predictably selects scheduling allocation information.

The scheduling decision function executor 906 may use various combinations using scheduling allow indicators 902 and 903 from non-optimal base stations and dedicated scheduling allocation information 901 from an optimal base station in addition to the two methods described above. According to the scheduling assignment value 908 is output. The output of the scheduling decision function executor 906 becomes final scheduling information for the E-DCH to be transmitted by the terminal, and the terminal determines the transmission format of the E-DCH using the scheduling information.

<< 2nd Example >>

According to the second embodiment of the present invention, the non-optimal base station performs common scheduling using three signal levels. That is, the non-optimal base station indicates three levels of a scheduling allowance indicator, a down signal 'DOWN', a margin down signal 'MARGINAL DOWN', and an ignore signal 'Don't care'. The optimal base station performs dedicated scheduling through independent dedicated scheduling assignment information to the terminals, and the non-optimal base station performs common scheduling through one scheduling allowance indicator to the various terminals. The optimal base station uses rate scheduling, time-rate scheduling, or both at the same time for dedicated scheduling, or any other possible scheduling method. On the other hand, common scheduling of a non-optimal base station controls transmission rates at three levels by using a scheduling grant indicator.

The scheduling permission indicator according to the common scheduling means a down signal when the real value +1 on the physical channel, and a neglected signal when the real value -1 on the physical channel is not transmitted. If it has zero, it means margin down signal. In other cases the three values +1, -1, 0 can be combined in different ways with the signals.

As an example, real values are mapped to the scheduling allowance indicator by considering the frequency of occurrence of the down signal, the ignore signal, and the margin down signal, respectively. That is, a real value 0 that takes a method of discontinuous transmission (DTX) on a physical channel is mapped to a signal predicted to have a high occurrence frequency. Here, discontinuous transmission is virtually non-transmission in the corresponding signal interval. When the signal is transmitted by the discontinuous transmission method, power consumption in the physical channel is saved, and thus gain can be simultaneously obtained in terms of reducing transmission power and noise reduction. For example, if the ignore signal is generated more frequently than the down signal and the margin down signal, the terminal maps the ignore signal to a real value of 0 on the physical channel and transmits the non-transmission method by the non-transmission method. A real value +1 (or -1) and a margin down signal are mapped to -1 (or +1) and transmitted.

The common scheduling allocation method performed by the non-optimal base station is as follows.

The base station manages uplink resources by measuring reception strengths of terminals included in the base station in performing scheduling. In this case, when the reception strength of the terminals for which the base station is set to the non-optimal base station is very large, the base station is the terminal when the base station is used as the optimal base station, or if the base station is included in the activity combination. Set the scheduling permission indicator to the descending signal. On the contrary, if the reception strength does not significantly affect the base station and there is room for reverse resources of the base station, the base station sets the scheduling permission indicator for the terminals as a disregard signal. In addition, although the reception strength affects the base station to some extent, the non-optimal base station has a relatively relaxed situation in the utilization of reverse resources, or the reverse resources of the base station have a margin by restricting all backward transmission of the terminals. In this case, the base station sets the scheduling permission indicator for the terminals to the margin down signal. In other words, the margin down signal is instructed to reduce the backward rate less forcibly than the down signal.

The operation of the terminal for the second embodiment will be described again with reference to FIG. 9. A UE located in the soft handover area has one optimal base station and one or more non-optimal base stations.

Referring to FIG. 9, the terminal receives scheduling allocation information 901 from an optimal base station. The dedicated scheduling assignment information 901 becomes a rate allowance (RG) signal when the rate scheduling method is used, and becomes a scheduling assignment (SA) signal when the time-rate scheduling method is used. If both are used, this will be a combination of the rate allowed signal and the scheduling assignment signal. The terminal also receives n scheduling grant values 902 to 903 from n non-optimal base stations (where n is an integer greater than or equal to 1). Here, the scheduling permission value means a real value of the scheduling permission indicator. The scheduling allow combining function executor 904 for non-optimal base stations combines the n scheduling allow values 902 to 903 to obtain one combined scheduling allowance 905. The operation of the scheduling permission fault function executor 904 will be described in detail below.

The combined scheduling allowance value 905 found from the n scheduling allowance values 902 to 903 is input to a scheduling decision function executor 906 along with dedicated scheduling assignment information 901 received from the optimal base station, and is scheduled. The decision function executor 906 determines the final scheduling assignment value 908 necessary for the terminal to determine the transmission format (TF) of the E-DCH and the terminal determines the scheduling assignment value determined by the scheduling decision function executor 906. 908 determines the transmission format of the E-DCH to be used for reverse transmission. The E-DCH transmission format is determined within a maximum data rate corresponding to the scheduling allocation value 908. The operation of the scheduling decision function executor 906 will also be described in detail below.

The scheduling allow combining function executor 904 of FIG. 9 is used when the number of non-optimal base stations of the terminal is greater than two, and the following operations are possible.

As a first example, the scheduling allow combining function executor 904 uses a reference setting method that uses a falling signal as a preferential reference. That is, the scheduling allow combining function executor 904 determines the combined scheduling allowance value 905 of the non-optimal base stations as the down signal if any one of the scheduling allow values 902 and 903 received by the terminal indicates the down signal. If all of the scheduling allowances are not a down signal, the following reference is used as the margin down signal. That is, the scheduling allow combining function executor 904 may margin the combined scheduling allowance value 905 of the non-optimal base stations if the scheduling allowance values 902 and 903 received by the terminal are not all down signals but indicate a margin lowering signal. Determined by the down signal. Finally, if all scheduling allowance values received by the terminal are all disregard signals, the scheduling allow combining function executor 904 determines the combined scheduling allowance value 905 of the non-optimal base stations as the disregard signal.

As another example, the terminal combines combined scheduling allowance values of non-optimal base stations using a weighted sum. The weight sum is to use a weight value set for each non-optimal base station. Likewise, with reference to FIG. 10 mentioned above, the weighted sum combining method of the scheduling allowable weighted sums according to the second embodiment will be described in detail.

Referring to FIG. 10, when n scheduling allowance values 1001, 1002, and 1003 received from n non-optimal base stations are received, the scheduling allowance values 1001 to 1003 are respectively assigned predetermined weight values 1005, 1007,. 1009 and multipliers 1006, 1008, 1010 and then summed by summer 1011. Summer 1011 adds the scheduling allowance values multiplied by the weights 1005 to 1009 to produce one weighted sum value. The joint scheduling allowance value generator 1012 then determines the joint scheduling allowance value 905 according to the weighted sum value.

The combined scheduling allowance value 905 is determined by comparing the weighted sum value with two predetermined reference values. For example, if the scheduling allowance indicator has a real value of +1, it means a down signal, and if it has a real value of 0, it means a margin down signal, and if it has a real value of -1, it means a negation signal. The reference values are the one value between +1 and 0 (value 1) and the other value between 0 and -1 (value 2). Therefore, if the weighted sum value is greater than (value 1), the combined scheduling allowance value 905 is determined to be a down signal, and if the weighted sum value is less than the (value 2), the combined scheduling allowance value ( 905 is determined to be an ignore signal. When the weighted sum value is located between the (value 1) and the (value 2), the combined scheduling allowance value is determined as a margin down signal. The (value 1) and the (value 2) may be a predetermined value, a value notified through higher signaling from the RNC, or a value selected by the terminal.

As another example, the scheduling allow combining function executor 904 operates by combining the two examples described above. Specifically, the scheduling allow combining function executor 904 preferentially determines the combined scheduling allowance value 905 as a lowering signal when any one of the scheduling allowances 902 and 903 has a lowering signal based on the lowering signal. In the absence of any down signal, the combined scheduling allowance value 905 is determined using a weighted sum method of the margin down signal and the ignore signal. Here, one reference value between 0 and -1 is used to distinguish the margin down signal and the ignore signal.

The scheduling decision function executor 906 of FIG. 9 receives the combined scheduling allowance value 905 determined above and the dedicated scheduling allocation information 901 of the optimal base station received by the terminal, and transmits the E-DCH transmission format to be transmitted by the terminal. The scheduling assignment value 908 is outputted so as to be determined. When the combined scheduling allowance value 905 means 'Don't care', even if the E-DCH transmission format of the UE is changed to some extent, the non-optimal BS of the UE is not significantly affected by the uplink resource usage. . Accordingly, the terminal determines the format of the E-DCH using the dedicated scheduling allocation information 901 transmitted by the optimal base station.

On the other hand, when the combined scheduling allowance value 905 means 'DOWN', it means that the E-DCH transmission of the UE acts as a burden on the reverse resource use of the non-optimal base station. Accordingly, the UE determines the transmission format of the E-DCH by unconditionally lowering the maximum allowed rate of the E-DCH according to the 'down' signal.

Finally, if the combined scheduling allowance value 905 is 'MARGINAL DOWN', this means that the E-DCH transmission of the UE may be a relatively large burden on the use of reverse resources of the non-optimal base station. That is, the combined scheduling allowance value 905 is referred to as 'MARGINAL DOWN', which means that a non-optimal base station commands a rate by one step to all of the terminals or terminals that set themselves as the optimal base station (rate scheduling). ), Or a command (for time-rate scheduling) that limits the E-DCH transmission itself. Therefore, similar to the 'down' signal of the first embodiment, the following selective down methods are used.

In the first method, a stochastic 'falling' decision method is used. If the probability randomly generated through the probability test is greater than or equal to a predetermined value, the UE interprets the 'margin lowering' decision of the combined scheduling allowance value 905 as a 'down' signal to reduce the transmission rate of the E-DCH by one step. Otherwise, the combined scheduling allowance value 905 is ignored. If the combined scheduling allowance value 905 is ignored, the UE uses the previous frame format as it is in determining the format of the E-DCH, or follows dedicated scheduling allocation information 901 of the optimal base station.

In the second method, when rate scheduling is used, it is determined whether or not to accept the 'margin lowering' decision according to the transmission rate of the terminal currently being used. The terminal has a constant rate threshold. If the transmission rate of the currently transmitting E-DCH becomes greater than or equal to the threshold, since the non-optimal base station may be greatly influenced by the E-DCH transmission of the terminal, the terminal may be determined as' Decrease the margin 'decision as a' down 'signal to reduce the transmission rate of the E-DCH by one step. On the other hand, if the transmission rate of the currently transmitting E-DCH is smaller than the threshold, since the non-optimal base station is not significantly affected by the E-DCH transmission of the terminal, the terminal ignores the combined scheduling allowance value 905 and transfers it. The frame rate is maintained as it is, or the dedicated scheduling allocation information 901 of the optimal base station is followed.

In the third method, the UE receiving the E-DCH uses an initial grade. The rating may be connected to a rating of the quality of the E-DCH of the UE and performs a method of determining a transmission rate of the E-DCH according to the rating. The criteria for dividing the rating may be charging of the user of the terminal or channel status. The terminal has a predetermined class, and operates as follows when receiving a 'blank margin' signal according to the class.
The higher level terminal uses the dedicated scheduling allocation information 901 of the optimal base station regardless of the reception of the 'down margin' signal, while the lower level terminal 'lows down' the signal according to the reception of the 'down margin' signal. 'Signal to reduce the E-DCH transmission rate by one step. As another example, the terminal has a different probability threshold according to the class, and when the probability randomly generated through the probabilistic test is greater than the probability threshold, the signal is reduced to the margin of the combined scheduling allowance value 905. Otherwise, the combined scheduling allowance value 905 is ignored. If the combined scheduling allowance value 905 is ignored, the UE uses the previous frame format as it is in determining the format of the E-DCH, or follows dedicated scheduling allocation information 901 of the optimal base station.
The class information of each terminal may also be transmitted to the base station, which may be directly transmitted to the base station by the network or the terminal in the channel setting process with the initial terminal. When the base station knows the class of the terminal, it is possible to predict how much among the terminals located in the soft handover region to follow the scheduling allocation information of the base station, so that it can be used as an efficient variable in selecting the scheduling allocation information. .

The fourth method is a method in which the UE receiving the E-DCH is separately signaled from the RNC to interpret a 'blank margin' signal of the non-optimal base stations. That is, the RNC informs each UE of a method of interpreting a 'border down' signal from non-optimal BSs during soft handover, that is, a scheduling decision function using RRC signaling, and the UE uses ERC using signaling information of the RNC. -Determine the transmission rate of the DCH.
For example, the RNC informs the scheduling determination function as 1 and 0 according to the state of the terminal, and the terminal signaled with 1 determines the 'blank margin' signal as a 'ignore' signal to determine dedicated scheduling allocation information 901 of the optimal base station. On the other hand, the terminal signaled with '0' lowers the E-DCH transmission rate by one step by judging the 'border down' signal as the 'down' signal. As another example, the RNC signals each terminal a threshold used for probability test of the soft handover region. Accordingly, when the non-optimal base station transmits a 'blank margin' signal, when the probability randomly generated through a probabilistic test is greater than the threshold signaled by the RNC, the margin margin signal of the combined scheduling allowance value 905 may be used. Is determined to be a 'down' signal, otherwise the combined scheduling allowance value 905 is ignored. When the combined scheduling allowance value 905 is ignored, the UE uses the previous frame format as it is in determining the format of the E-DCH or uses the dedicated scheduling allocation information 901 of the optimal base station as it is.
By transmitting the signaling information transmitted by the RNC to the terminal to the base station, scheduling of the base station can be performed more efficiently. That is, the base station knows how to interpret when the terminal receives a 'blank margin' signal from the non-optimal base station in soft handover, and how much of the terminals located in the soft handover area to follow the scheduling allocation information of the base station. Predictably select scheduling allocation information.

The scheduling decision function executor 906 may use various combinations using scheduling allow indicators 902 and 903 from non-optimal base stations and dedicated scheduling allocation information 901 from optimal base stations in addition to the two methods described above. According to the scheduling assignment value 908 is output. The output of the scheduling decision function executor 906 becomes final scheduling information for the E-DCH to be transmitted by the terminal, and the terminal determines the transmission format of the E-DCH using the scheduling information.

In the above two embodiments, the non-optimal base station schedules the terminals located in the soft handover area through the scheduling allow indicator, and each terminal receives the scheduling allow indicators received from the non-optimal base stations and the optimal scheduling base station. A method of determining a transmission format of an E-DCH using dedicated scheduling allocation information has been described. As the scheduling permission indicator, the first embodiment shows two levels of the down signal and the ignore signal, and the second embodiment shows three levels of the down signal and the margin down signal and the ignore signal.

The method of the present invention described above may be somewhat specific, but is not limited to the above description, and various modifications are possible without departing from the scope of the present invention. In detail, another modified embodiment of the present invention may indicate more levels with the scheduling permission indicator, thereby giving more flexibility in performing common scheduling by the non-optimal base station. Therefore, the scope of the present invention should not be limited to the method described above, 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.

The present invention can reduce the consumption of the transmission power of the base station and the consumption of the forward channel code resources due to the transmission of the forward scheduling information signal for the scheduling of the terminals located in the soft handover area, and proposes an additional interpretation method of the terminal. By using the common scheduling information to propose a method that can perform a different function for each terminal.

Claims (40)

A scheduling method for a user terminal in soft handover in a mobile communication system supporting a high speed reverse packet data service, Receiving, by the soft handover, a user terminal communicating with one optimal base station and at least one non-optimal base station from the optimal base station with dedicated scheduling allocation information according to the dedicated scheduling assignment; Receiving, by the user terminal, at least one scheduling permission indicator according to a common scheduling assignment from the at least one non-optimal base station; Determining a combined scheduling permission indicator by combining at least one scheduling permission indicator received from the at least one non-optimal base station; Determining whether to use the combined scheduling permission indicator according to a predetermined criterion; And determining a maximum transmission rate of a reverse link according to the dedicated scheduling assignment information or the combined scheduling permission indicator. The method of claim 1, wherein the at least one scheduling permission indicator, A 'DOWN' signal indicating to lower the maximum rate for the high speed reverse packet data service or a 'Don't care' signal indicating to follow the dedicated scheduling allocation information. Scheduling method. The method of claim 2, wherein the determining of the combined scheduling permission indicator comprises: If the at least one scheduling permission indicator includes at least one down signal, the combined scheduling permission indicator is determined to be a down signal, and if the at least one scheduling permission indicator is all ignored, the combined scheduling permission indicator is determined to be an ignore signal. Scheduling method, characterized in that. The method of claim 2, wherein the determining of the combined scheduling permission indicator comprises: A weighted value is calculated by applying a weight assigned to a corresponding non-optimal base station to the at least one scheduling allowance indicator, and compares the weighted sum value with a predetermined reference value to lower the combined scheduling allowance indicator signal or Scheduling method characterized in that it is determined by the ignore signal. The method of claim 2, wherein the determining of the maximum data rate comprises: If the combined scheduling allowance indicator is a disregard signal, the maximum transmission rate is determined according to the dedicated scheduling allocation information. If the combined scheduling allowance indicator is a down signal, a predetermined probability value for the terminal to lower the maximum transmission rate, the user And determining the maximum data rate according to at least one of a current reverse data rate of a terminal, a service level of the user terminal, and control signaling of a network. The method of claim 5, wherein If the combined scheduling allowance indicator is a falling signal, the probability value is compared with a predetermined threshold value, and if the probability value is greater than or equal to the threshold value, the maximum data rate is reduced by one step, and if the probability value is less than the threshold value, the And determining the maximum transmission rate or maintaining the transmission rate of the previous frame according to the dedicated scheduling allocation information. The method of claim 5, wherein If the combined scheduling allowance indicator is a falling signal, the current reverse rate of the user terminal is compared with a predetermined threshold; if the current reverse rate is greater than or equal to the threshold, the maximum rate is reduced by one step, and the current reverse rate is If it is smaller than the threshold, the scheduling method characterized in that for determining the maximum transmission rate or maintains the transmission rate of the previous frame according to the dedicated scheduling allocation information. The method of claim 5, wherein Determining the maximum transmission rate according to the dedicated scheduling allocation information if the service grade set in the user terminal is higher than a predetermined criterion; and decreasing the maximum transmission rate by one step if the service grade is a lower grade than the reference. Scheduling method characterized by. The method of claim 5, wherein If the signaling signal from the network is a 'predetermined bit value', determining the maximum transmission rate according to the dedicated scheduling assignment information; and if the signaling signal is not a 'presetting bit value', reducing the maximum transmission rate by one step. Scheduling method characterized by. The method of claim 1, wherein the at least one scheduling permission indicator, A 'DOWN' signal indicating to lower the maximum rate for the high speed reverse packet data service or a 'Don't care' signal or a predetermined condition indicating to follow the dedicated scheduling allocation information. And optionally, a 'MARGINAL DOWN' signal indicating to lower the maximum data rate. The method of claim 10, wherein the determining of the combined scheduling permission indicator comprises: If the at least one scheduling permission indicator includes at least one falling signal, determining the combined scheduling permission indicator as a falling signal, If the at least one scheduling permission indicator does not include a down signal and includes at least one margin down signal, the combined scheduling permission indicator is determined as a margin down signal. And if the at least one scheduling permission indicator is an ignore signal, determining the combined scheduling permission indicator as an ignore signal. The method of claim 10, wherein the determining of the combined scheduling permission indicator comprises: A weighted value is calculated by applying a weight assigned to a corresponding non-optimal base station to the at least one scheduling allowance indicator, and compares the weighted sum value with a predetermined reference value to lower the combined scheduling allowance indicator signal or A scheduling method characterized in that it is determined by the margin down signal or the ignore signal. The method of claim 10, wherein the determining of the maximum data rate comprises: If the combined scheduling allowance indicator is the disregard signal, the maximum transmission rate is determined according to the dedicated scheduling allocation information. If the combined scheduling allowance indicator is a down signal, the maximum data rate is decreased by one step. If the combined scheduling allowance indicator is a margin lowering signal, according to at least one of a predetermined probability value for the terminal to lower the maximum transmission rate, the current reverse transmission rate of the user terminal, the service class of the user terminal, the control signaling of the network And scheduling the transmission format. The method of claim 13, If the combined scheduling allowance indicator is a margin lowering signal, the probability value is compared with a predetermined threshold value, and if the probability value is greater than or equal to the threshold value, the maximum transmission rate is reduced by one step, and if the probability value is small, the dedicated scheduling is performed. The maximum transmission rate according to the allocation information or scheduling method characterized in that to maintain the transmission rate of the previous frame. The method of claim 13, If the combined scheduling allowance indicator is a blanking down signal, the current reverse rate of the user terminal is compared with a predetermined threshold; if the current reverse rate is greater than or equal to the threshold, the maximum rate is reduced by one step; If it is smaller than the threshold, the scheduling method according to the dedicated scheduling allocation information, characterized in that for determining the maximum transmission rate or maintaining the transmission rate of the previous frame. The method of claim 13, Determining the maximum transmission rate according to the dedicated scheduling allocation information if the service grade set in the user terminal is higher than a predetermined criterion; and decreasing the maximum transmission rate by one step if the service grade is a lower grade than the reference. Scheduling method characterized by. The method of claim 13, If the signaling signal from the network is 'predetermined bit value', the maximum rate is determined according to the dedicated scheduling allocation information, and if the signaling signal is not 'predetermined bit value', reducing the maximum rate by one step Scheduling method characterized by. The method of claim 1, wherein the dedicated scheduling assignment information, A 'DOWN' signal indicating to lower the maximum rate for the high-speed reverse packet data service, a 'KEEP' signal indicating to maintain the maximum rate, or to raise the maximum rate by one level Scheduling method comprising any one of the 'UP' signal. The method of claim 1, wherein the dedicated scheduling assignment information, And a scheduling assignment signal that directly indicates the maximum rate and transmission timing for the high speed reverse packet data service. The method of claim 1, wherein the dedicated scheduling assignment information, A rate including any one of a down signal indicating to lower the maximum rate for the high-speed reverse packet data service, a holding signal indicating to maintain the maximum rate, or a raising signal indicating to raise the maximum rate by one level With allowable signal, And a scheduling allocation signal for directly indicating the maximum data rate. A scheduling apparatus of a user terminal in soft handover in a mobile communication system supporting high speed reverse packet data service, A receiving unit for receiving dedicated scheduling allocation information according to a dedicated scheduling assignment from an optimal base station and receiving at least one scheduling permission indicator according to a common scheduling assignment from at least one non-optimal base station; A first scheduling determiner that combines at least one scheduling permission indicator received from the at least one non-optimal base station to determine a combined scheduling permission indicator; A second scheduling determiner determining whether to use the combined scheduling permission indicator according to a predetermined criterion, and determining the maximum transmission rate of the reverse link according to the dedicated scheduling allocation information or the combined scheduling permission indicator; And a transmission format determiner for determining a transmission format of a reverse link within the maximum transmission rate. The method of claim 21, wherein the at least one scheduling permission indicator, A 'DOWN' signal indicating to lower the maximum rate for the high speed reverse packet data service or a 'Don't care' signal indicating to follow the dedicated scheduling allocation information. Scheduling device. The method of claim 22, wherein the first scheduling determiner, If the at least one scheduling permission indicator includes at least one down signal, the combined scheduling permission indicator is determined as a down signal. And if the at least one scheduling permission indicator is an ignore signal, determining the combined scheduling permission indicator as an ignore signal. The method of claim 22, wherein the first scheduling determiner, A weighted value is calculated by applying the weights assigned to the corresponding non-optimal base stations to the at least one scheduling allowance indicator, and compares the weighted sum value with a predetermined reference value to lower the combined scheduling allowance indicator signal or The scheduling apparatus, characterized in that determined by the ignore signal. The method of claim 22, wherein the second scheduling determiner, If the combined scheduling allowance indicator is a disregard signal, the maximum transmission rate is determined according to the dedicated scheduling allocation information. If the combined scheduling allowance indicator is a down signal, a predetermined probability value for the terminal to lower the maximum transmission rate, the user And the maximum transmission rate is determined according to at least one of a current reverse rate of a terminal, a service level of the user terminal, and control signaling of a network. The method of claim 25, If the combined scheduling allowance indicator is a falling signal, the probability value is compared with a predetermined threshold value, and if the probability value is greater than or equal to the threshold value, the maximum data rate is reduced by one step, and if the probability value is less than the threshold value, the And determining the maximum transmission rate or maintaining the transmission rate of a previous frame according to dedicated scheduling allocation information. The method of claim 25, If the combined scheduling allowance indicator is a falling signal, the current reverse rate of the user terminal is compared with a predetermined threshold; if the current reverse rate is greater than or equal to the threshold, the maximum rate is reduced by one step, and the current reverse rate is If it is smaller than the threshold, the scheduling apparatus characterized in that for determining the maximum transmission rate or maintains the transmission rate of the previous frame according to the dedicated scheduling allocation information. The method of claim 25, Determining the maximum transmission rate according to the dedicated scheduling allocation information if the service grade set in the user terminal is higher than a predetermined criterion; and decreasing the maximum transmission rate by one step if the service grade is a lower grade than the reference. Scheduling device characterized in. The method of claim 25, If the signaling signal from the network is 'predetermined bit value', the maximum rate is determined according to the dedicated scheduling allocation information, and if the signaling signal is not 'predetermined bit value', reducing the maximum rate by one step Scheduling device characterized in. The method of claim 21, wherein the at least one scheduling permission indicator, A 'DOWN' signal indicating to lower the maximum rate for the high speed reverse packet data service or a 'Don't care' signal or a predetermined condition indicating to follow the dedicated scheduling allocation information. And optionally a 'MARGINAL DOWN' signal indicating to lower the maximum data rate. The method of claim 30, wherein the first scheduling determiner, If the at least one scheduling permission indicator includes at least one falling signal, determining the combined scheduling permission indicator as a falling signal, If the at least one scheduling permission indicator does not include a down signal and includes at least one margin down signal, the combined scheduling permission indicator is determined as a margin down signal. And if the at least one scheduling permission indicator is an ignore signal, determining the combined scheduling permission indicator as an ignore signal. The method of claim 30, wherein the first scheduling determiner, A weighted value is calculated by applying a weight assigned to a corresponding non-optimal base station to the at least one scheduling allowance indicator, and compares the weighted sum value with a predetermined reference value to lower the combined scheduling allowance indicator signal or A scheduling apparatus, characterized in that determined by the margin down signal or the ignore signal. The method of claim 30, wherein the second scheduling determiner, If the combined scheduling allowance indicator is the disregard signal, the maximum transmission rate is determined according to the dedicated scheduling allocation information. If the combined scheduling allowance indicator is a down signal, the maximum data rate is decreased by one step. If the combined scheduling allowance indicator is a margin lowering signal, according to at least one of a predetermined probability value for the terminal to lower the maximum transmission rate, the current reverse transmission rate of the user terminal, the service class of the user terminal, the control signaling of the network The scheduling apparatus, characterized in that for determining the transmission format. The method of claim 33, wherein If the combined scheduling allowance indicator is a margin lowering signal, the probability value is compared with a predetermined threshold value, and if the probability value is greater than or equal to the threshold value, the maximum transmission rate is reduced by one step, and if the probability value is small, the dedicated scheduling is performed. The scheduling apparatus according to the allocation information, characterized in that for determining the maximum transmission rate or to maintain the transmission rate of the previous frame. The method of claim 33, wherein If the combined scheduling allowance indicator is a blanking down signal, the current reverse rate of the user terminal is compared with a predetermined threshold; if the current reverse rate is greater than or equal to the threshold, the maximum rate is reduced by one step; If the threshold is less than the threshold value, the scheduling apparatus according to the dedicated scheduling allocation information, the scheduling apparatus characterized in that to determine the maximum transmission rate or to maintain the transmission rate of the previous frame. The method of claim 33, wherein Determining the maximum transmission rate according to the dedicated scheduling allocation information if the service grade set in the user terminal is higher than a predetermined criterion; and decreasing the maximum transmission rate by one step if the service grade is a lower grade than the reference. Scheduling device characterized in. The method of claim 33, wherein If the signaling signal from the network is 'predetermined bit value', the maximum rate is determined according to the dedicated scheduling allocation information, and if the signaling signal is not 'predetermined bit value', reducing the maximum rate by one step Scheduling device characterized in. The method of claim 21, wherein the dedicated scheduling assignment information, A 'DOWN' signal indicating to lower the maximum rate for the high-speed reverse packet data service, a 'KEEP' signal indicating to maintain the maximum rate, or to raise the maximum rate by one level A scheduling apparatus, characterized in that it comprises any one of the (UP) signal. The method of claim 21, wherein the dedicated scheduling assignment information, And a scheduling assignment signal that directly indicates the maximum rate and transmission timing for the high speed reverse packet data service. The method of claim 21, wherein the dedicated scheduling assignment information, A rate including any one of a down signal indicating to lower the maximum rate for the high-speed reverse packet data service, a holding signal indicating to maintain the maximum rate, or a raising signal indicating to raise the maximum rate by one level With allowable signal, And a scheduling allocation signal for directly indicating the maximum data rate.

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