KR20110055016A - Sytem and method for allocation of dedicated resources for efficient uplink transmission in high-speed wireless communication systems - Google Patents

Abstract

PURPOSE: A dedicated resource allocation system for transmitting uplink is provided to effectively secure a wireless resource for an uplink packet service. CONSTITUTION: A base station(430) selects a time slot having a dedicated channel call which has the least or the most various calls in a HSUPA(High-Speed Uplink Packet Access) service. The base station selects an UL code for a dedicated channel service in a specific time slot. The base station allocates uplink resources. By a selection, it is prevented to block using an additional mother code. A user terminal(410) transmits data through allocated uplink resources.

Description

System and method for allocation of dedicated resources for efficient uplink transmission in high-speed wireless communication systems}

The present invention relates to a radio resource allocation method and system for a high speed uplink packet service in a high-speed uplink packet access (HSUPA) system based on time division duplexing (TDD). Dedicated resource allocation for uplink transmission, which can improve uplink transmission speed provided by HSUPA service by allocating uplink code and timeslot resources to maximize HSUPA uplink radio resources when the service occurs. It relates to a method and a system thereof.

In general, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) is one of the third generation (3G) mobile communication technologies that combines the advantages of TDD / TDMA and CDMA. The TD-SCDMA system was proposed by the China Wireless Technology Standard (CWTS) Group in 1998 based on the huge potential of the Chinese mobile communication market, and was established as a 3G standard by the International Telecommunications Union (ITU) in May 2000. The following year, in March 2001, the 3GPP (The Third Generation Partnership Project), which is responsible for standardizing third-generation mobile communication systems, was registered as a formal standard included in Release 4.

As the name suggests, TD-SCDMA combines Time Division Duplexing (TDD) and Time Division Multiple Access (TDMA) technology with synchronous CDMA technology. Thus, it has unique advantages over other 3G technologies such as WCDMA and CDMA 2000, such as flexible frequency allocation, low cost transceiver implementation, and simple network evolution from GSM systems.

Compared with the existing Wideband Code Division Multiple Access (WCDMA), this technology can be said to replace the wireless access technology with TD-SCDMA rather than WCDMA. In fact, 3GPP, which prepares WCDMA and TD-SCDMA standards, treats the rest as WCDMA except for the physical layer and the second layer of the air interface. Therefore, it can be said that the basic structure of TD-SCDMA is the same as that of the WCDMA system.

Using the same carrier frequency, TD-SCDMA system can support not only HSUPA service but also various services including voice call and video call at the same time. TDD HSUPA provides dedicated channel (DCH) service (eg voice call, video call) Packet service is provided by using an RU that is not allocated. The uplink is allocated a code based on the OVSF code tree structure. If the time slot and the code resource for the available radio resources do not have a predetermined pattern in the uplink, the uplink radio resource may be wasted.

1 is a diagram illustrating an example of a TD-SCDMA subframe in which a conventional DCH service and a HSUPA service coexist. In FIG. 1, each scale indicates 1RU, and resources may be allocated in units of 16RU (Resource Unit) for each time slot. For voice calls, 2RU (one SF = 8 code) is used, and the required RU may vary depending on the type of service. The colored part corresponds to the fixed radio resource allocated to the voice service. In FIG. 1, seven voice services using 2RU, one service using 10RU, and one service using 8RU are assumed.

In the structure shown in FIG. 1, the total idle resources are 32RU, but the base station cannot allocate all idle resources to the terminals. If the base station uses two E-AGCH, the maximum RU that can be allocated by the base station is only 14RU, which is the sum of 6RU and 8RU indicated by dotted lines in FIG. 1, and the remaining 18RU becomes wasted resources. Uplink resources allocated through the E-AGCH are represented by CRRI and TRRI. CRRI uses only one code and TRRI can be allocated a plurality of slots in a sub-frame. However, even if several different time slots are allocated, only the same code should be used. Therefore, considering the OVSF code structure, the best way to allocate in a given sub-frame structure is to use 6 E and 8 RUs using 2 E-AGCHs, respectively. How to assign.

 As a result, the resource allocation method using the existing technology does not have a particular interest in resource allocation for the DCH service, there is a problem that resources are wasted depending on the code and slot location of the idle resources when supporting TDD HSUPA.

An object of the present invention for solving the above problems is to use a fixed dedicated radio resources in a high-speed wireless communication system in consideration of the location of the code and slot when allocating resources for the DCH service in order to improve the waste of the above-mentioned resources. Dedicated resource allocation system for increasing utilization of uplink radio resources by sequentially allocating empty RUs based on a code or slot when a service occurs, a dedicated resource allocation method for uplink transmission thereof, a base station and its uplink The present invention provides a method for allocating dedicated resources for link transmission.

Dedicated resource allocation system according to the present invention for achieving the above object, when selecting the time slot with the lowest or most dedicated channel call in the HSUPA service, when selecting the uplink code for the dedicated channel service in a specific time slot A base station for allocating uplink resources by selecting to prevent blocking of additional mother codes; And a user terminal which requests a dedicated resource service to the base station, receives an uplink resource for the dedicated channel service from the base station, and transmits data to the base station through the base station.

On the other hand, the base station according to the present invention for achieving the above object, a communication unit for communicating with the user terminal; A resource allocator for allocating an uplink resource to the user terminal; A scheduler for scheduling a data packet according to a dedicated channel service to the user terminal; And sequentially searching for an empty resource in a timeslot for the dedicated channel service when providing a dedicated channel service to the user terminal, and sequentially vacant resources through the resource allocator so as to prevent additional allocation of a code. And a control unit for controlling the allocation.

The controller selects a time slot having the least number of DCH calls or a time slot having the largest number of calls of the dedicated channel service whenever a call of the dedicated channel service is generated.

In addition, when selecting an uplink code for the dedicated channel service in a specific timeslot, the controller allocates an uplink code used in an adjacent timeslot so that continuous HSUPA resources can be secured when additional mother codes are needed. do.

The controller allocates an uplink resource from a timeslot in which a voice service is least supported or an uplink resource from a timeslot in which a voice service is most supported in order to secure a large number of HSUPA resources in a specific timeslot. .

On the other hand, the dedicated resource allocation method for uplink transmission according to the present invention for achieving the above object, as a dedicated resource allocation method for uplink transmission of a system comprising a user terminal and a base station, (a) the user terminal Requesting a dedicated channel service from the base station; (b) sequentially searching for empty RU resources in the timeslot for the dedicated channel service; (c) sequentially allocating the empty RU resources to prevent further allocation of mother codes; And (d) the base station notifying the user terminal of the allocated RU resource using an E-AGCH.

On the other hand, the dedicated resource allocation method for uplink transmission of the base station according to the present invention for achieving the above object, as a dedicated resource allocation method for uplink transmission of the base station providing a dedicated resource service to the user terminal, (a Receiving a request for a dedicated resource service from the user terminal; (b) sequentially searching for empty RU resources in the timeslot for the dedicated resource service; (c) if the empty RU resource is found, sequentially checking the availability of higher codes while sequentially decreasing a spreading factor (SF) in a code tree structure; And (d) selecting a code of which the mother code is blocked among the available codes of the higher code and assigning the code to the user terminal.

In addition, when the additional mother code is needed in step (d), an uplink code blocked in an adjacent timeslot is allocated to the user terminal.

In addition, step (d) allocates an uplink resource to the user terminal in a timeslot in which voice service is least supported.

In step (d), an uplink resource is allocated to the user terminal from a timeslot in which a voice service is most supported.

According to the present invention, it is possible to effectively secure a radio resource for providing a high-speed uplink packet service can greatly improve the uplink transmission rate.

In addition, it is possible to increase the utilization of uplink radio resources in a high-speed wireless communication system, and to support the TDD HSUPA, it is possible to prevent resources from being wasted according to code and slot positions of idle resources.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The most basic mode of operation adopted by TD-SCDMA technology is TDD (Time Division Duplexing). That is, a service is provided using the same band without separating frequencies for uplink and downlink.

By using the TDD scheme, since the uplink and the downlink are not separated, a guard band for frequency separation is not required, and asymmetric services can be supported in both directions, thereby maximizing frequency efficiency.

In addition, the transmitter and receiver RF modules must be separately implemented in the FDD transceiver, but TD-SCDMA can use a single RF module for transmission and reception, thereby enabling a low-cost transceiver.

In addition, since propagation characteristics of channels for downlink and uplink are also very similar, system capacity can be improved by utilizing smart antenna technology and joint detection technology.

2 is a diagram illustrating a basic frame structure of a TD-SCDMA physical channel applied to an embodiment of the present invention.

In FIG. 2, a frame of TD-SCDMA has a length of 10 ms. Multiple frames are bundled together to form a super frame, and each frame consists of two 5 ms long sub-frames. In particular, the basic unit for data transmission in TD-SCDMA becomes a sub-frame.

A downlink signal and an uplink signal coexist in one sub-frame, and a point in time at which the transmission direction is changed is called a switching point. In TD-SCDMA, there are always two switching points in one sub-frame as shown in FIG. Of the seven time slots (TS), TS0 is always assigned downlink and TS1 is always assigned uplink. Since the data transmission directions of TS0 and TS1 are different, this point is also a switching point. The remaining timeslots can be freely adjusted in length to allocate up / down to support asymmetric traffic. In FIG. 2, four timeslots are allocated to the downlink and three timeslots are allocated to the uplink. Since the direction of the link is switched between TS3 and TS4, this boundary becomes another switching point. Within each sub-frame, a special signal to support the operation of the TDD system is added, along with seven timeslots. This information is defined between TS0 and TS1, respectively. It is called GP (Guard Period). DwPTS is a signal for transmitting pilot information for downlink and is used for downlink synchronization and initial cell search. UpPTS consists of a total of 160 chips, 32 chips are used as GP, and the remaining 128 chips are used as SYNC. This SYNC signal is used for uplink initial synchronization, random access procedure, measurement of neighbor cell during handover, and so on. GP consists of 96 chips with a guard period that prevents overlap between DwPTS and UpPTS signals.

In HSUPA, technologies related to 16-QAM modulation, Adaptive Modulation & Coding (AMC), Hybrid ARQ (HARQ), high-speed scheduling, and various spreading factors (SF) are developed to increase the transmission speed based on TD-SCDMA technology. Was adopted.

16-QAM modulation is a modulation scheme (4 bits / symbol) that doubles the number of transmitted bits per symbol compared to the conventional QPSK. In HSUPA, QPSK is also used.

Adaptive Modulation & Coding (AMC) is a technology that dynamically applies modulation and channel coding rates according to uplink channel conditions. For example, QPSK and 16-QAM may be selectively selected according to the state of the uplink channel.

Hybrid ARQ (HARQ) combines Forward Error Correction (FEC) and Automatic Repeat Request (ARQ) to quickly recover from errors in the physical layer. The success rate of the packet can be increased by combining the previously transmitted packet and the retransmitted packet to lower the coding rate.

In the case of high-speed scheduling, in the early TD-SCDMA, a scheduling function is located in a base station controller (RNC), which causes a large delay in transmission control information. However, in HSUPA, the scheduling function is moved to a base station closer to the terminal. Transmission control information can be transmitted more quickly.

In the case of various spreading factors (SF), the terminal can select various transmission speeds. In this case, the method used is a method of changing the spreading coefficient according to the data transmission rate (spreading factors are 1, 2, 4, 8). , 16).

The largest spreading factor (SF) used in the physical layer of TD-SCDMA is 16, and this SF16 code becomes a basic radio resource. That is, one SF16 code used in a specific timeslot is called 1 resource unit (RU). Therefore, it can be said that one time slot has a total of 16RU resources. Similarly, the concept of RU can be applied even when having a lower diffusion coefficient. For example, since the SF4 code has the same transmission capacity as four SF16 codes, it can be regarded as a resource corresponding to 4 RUs.

3 is a diagram illustrating a data transmission process adopted by HSUPA according to an embodiment of the present invention.

The transmission time interval (TTI), which is a basic transmission interval related to data transmission in HSUPA, is 5 ms. All resources for uplink transmission, such as transmit power, timeslots, and code resources, are allocated by the base station. In addition, various physical channels for uplink high-speed data transmission have been added in HSUPA. First, an E-PUCH (enhanced physical uplink channel) is a channel for transmitting data in uplink, and one code (SF = 1, 2, 4, 8, 16) per slot is allocated to each user. Control channels supporting transmission of the E-PUCH include an enhanced uplink control channel (E-UCCH) and an enhanced random access uplink channel (E-RUCCH). The E-UCCH is often multiplexed with the E-PUCH, and the E-RUCCH uses uplink resources that contend with other terminals. The E-UCCH includes control information related to the decoding of the E-PUCH, and the E-PUCCH is used when the terminal requests radio resources for uplink transmission from the base station. An enhanced acknowledgment indicator channel (E-HICH) is a downlink channel indicating whether reception is successful at the base station for uplink transmission through the E-PUCH. In addition, there is an enhanced absolute grant channel (E-AGCH) as a downlink control channel for supporting uplink scheduling, which includes a scheduling control message transmitted from each terminal by a base station.

The data transmission process adopted by the HSUPA is shown in FIG. 3. First, the base station allocates an E-PUCH channel resource to a specific terminal through the E-AGCH, and the terminal transmits data using the assigned E-PUCH resource. The base station transmits an acknowledgment of the received data through the E-HICH (ACK or NACK). In FIG. 3, nE-AGCH represents the interval between the start of the E-AGCH and the first slot of the E-PUCH, which is set to 6 in the standard. E-PUCH resources allocated by the base station may be allocated from 1 to 5 depending on the location of the switching point, each terminal may be allocated a continuous slot to the limit not exceeding this. However, for convenience of implementation, the code and SF used in each slot are the same during a specific subframe. When the uplink transmission is completed, whether the transmission is successful is received through the E-HICH. At this time, the received E-HICH maintains an interval as much as nE-HICH with the last slot of the E-PUCH. This value is set by the upper layer and has a value between 4 and 15.

TD-SCDM uses Orthogonal Variable Spreading Factor (OVSF) as a channelization code to ensure orthogonality between physical channels. The OVSF code is a set of codes that are orthogonal to each other, and may select a code having various spreading coefficients (SF) according to a transmission speed of user data. 9 illustrates generation of OVSF using Walsh code among channelization codes of TD-SCDMA according to an embodiment of the present invention. As can be seen in Figure 9, the length of the code is increased by two times, two codes are generated from the short code. Code used to generate other code is called mother code, and code generated from the mother code is called child code. In FIG. 9, two ACKs are generated from one mother code.

The OVSF code is guaranteed the orthogonality between codes having the same SF, but not the orthogonality between the mother code and the sub-code. Therefore, various SF can be selected when selecting the channelization code, but the code must be selected to ensure orthogonality. For example, in FIG. 9, 0110 and 01100110 derived therefrom are not orthogonal and should not be used at the same time, but may be used simultaneously because they are orthogonal to 01011010 positioned above them. In addition, if a code of SF1 is adopted, all other channelization codes cannot be used, and likewise, if all 16 codes of SF16 are used, other channelization codes cannot be used. 9 shows a relationship between generated codes and is called a code tree because these relationships resemble trees and branches.

As can be seen from the OVSF code structure, when SF is fixed, the number of usable codes exists as many as the SF value. For example, there are eight OVSF codes that are SF8. In TD-SCDMA, since SF can use 1, 2, 4, 8, and 16, the total number of available channelization codes is 31. In uplink and downlink of TD-SCDMA, user data is spread using codes orthogonal to each other. In general, since downlink transmits data using 16 SF16 codes, multiple codes are used simultaneously when high-speed transmission is required. On the other hand, uplink is transmitted using one code with small SF during high speed transmission. Among the codes using SF = i to identify each code, the j th code is expressed as C (i, j). At this time, i = 1, 2, 4, 8, 16, j is 0, 1, 2,. , has a value of i-1.

4 is a configuration diagram schematically showing the overall configuration of a dedicated resource allocation system according to an embodiment of the present invention.

Referring to FIG. 4, the dedicated resource allocation system 400 according to the present invention includes a user terminal 410, a communication network 420, and a base station 430.

The user terminal 410 requests the dedicated resource service to the base station 430, receives an uplink resource for the DCH service from the base station 430, and transmits data to the base station 430 through this.

The communication network 420 is a mobile communication network and includes a CDMA 2000 1x, a CDMA 2000 1x EV-DO, a WCDMA network, a TD-SCDMA network, and the like.

The base station 430 selects a time slot having the least or most DCH call in the HSUPA service, and selects an uplink resource to be prevented from blocking additional code when selecting an uplink code for the DCH service in a specific time slot. Allocate

5 is a configuration diagram schematically showing a functional block of a base station according to an embodiment of the present invention.

Referring to FIG. 5, the base station 430 according to the present invention includes a communication unit 510, a resource allocation unit 520, a scheduler 530, and a control unit 540.

The communication unit 510 communicates with the user terminal 410 through a mobile communication network.

The resource allocator 520 allocates uplink resources to the user terminal 410.

The scheduler 530 schedules data packets according to the DCH service.

When the DCH service is provided to the user terminal 410, the controller 540 sequentially searches for an empty resource in a time slot for the DCH service, and then, through the resource allocator 520, to prevent additional allocation of a mother code. Controls that empty resources are allocated sequentially.

In addition, whenever a DCH call is generated, the controller 540 selects a time slot having the least DCH call or a time slot having the most DCH call.

In addition, when selecting an uplink code for the DCH service in a specific timeslot, the controller 540 allocates an uplink code that is used in an adjacent timeslot so as to secure continuous HSUPA resources when additional mother codes are needed. do.

In addition, the controller 540 allocates an uplink resource from a timeslot for which the voice service is least supported, or allocates an uplink resource from a timeslot for which the voice service is most supported in order to secure many HSUPA resources in a specific timeslot. Assign.

Meanwhile, various services supported by TD-SCDMA are allocated appropriate radio resources including time slots and codes. Basic radio resources of the TD-SCDMA physical layer may be discretized into resource units (RUs). In other words, one SF16 code is regarded as a basic allocation unit in a specific time slot. Therefore, the maximum radio resource that can be supported during one time slot corresponds to 16RU. For example, if two time slots are allocated to the uplink, a total of 32 RUs is allocated to the uplink. In particular, TD-SCDMA may use the spreading coefficients 1, 2, 4, 8, and 16. Codes other than SF16 are determined based on SF16. For example, SF1 corresponds to 16RU and SF4 corresponds to 4RU.

The standard specifies the number of time slots and codes required to support a particular service. Table 1 shows time slot and code resource criteria for supporting various services of TD-SCDMA. As shown in Table 1, most services require at least 2RU of radio resources. In exceptional cases, 1RU is used only for transmitting signaling information.

Since the transfer speed of data that can be supported in one time slot is limited, multiple time slots must be used simultaneously to support high-speed data service. For example, if the 144kbps service is transmitted in the downlink, SF16 codes are used for two time slots, eight per time slot (16 RU in total). In the case of the uplink, a low SF code is used, and similarly, multiple time slots are allocated to support a high data rate.

Type of service Transmission speed Downlink Uplink cordage TS number RU cordage TS number RU Signaling only 3.4 kbps SF16 x 1 1 TS 1 RU SF16 x 1 1 TS 1 RU Voice call 12.2 kbps SF16 x 2 1 TS 2 RU SF8 x 1 1 TS 2 RU Modem / fax 28.8 kbps SF16 x 3 1 TS 3 RU SF4 x 1 1 TS 4 RU 57.6 kbps SF16 x 6 1 TS 6 RU SF2 x 1 1 TS 8 RU Video call 64 kbps SF16 x 8 1 TS 8 RU SF2 x 1 1 TS 8 RU data 64 kbps SF16 x 8 1 TS 8 RU SF2 x 1 1 TS 8 RU 128 kbps SF16 x 14 1 TS 14 RU SF2 x 1 2 TS 16 RU 144 kbps SF16 x 8 2 TS 16 RU SF2 x 1 2 TS 16 RU 384 kbps SF16 x 10 4 TS 40 RU SF8 x 1
+ SF2 x 1 4 TS 40 RU

6 is a flowchart illustrating a dedicated resource allocation method for uplink transmission according to an embodiment of the present invention.

Referring to FIG. 6, the user terminal 410 requests the DCH service to the base station 430 (S610).

Accordingly, the base station 430 sequentially searches for empty RU resources in the timeslot for the DCH service (S620).

Subsequently, the base station 430 sequentially allocates empty RU resources to prevent further allocation of the mother code (S630).

In addition, the base station 430 informs the user terminal 410 of the allocated RU resource using the E-AGCH (S640).

On the other hand, since the uplink radio resource for HSUPA uses resources not used by the DCH service in an environment where the DCH service and the HSUPA service coexist, it is necessary to optimize the code and slot structure of the DCH service for efficient allocation of idle resources. have. This code / slot optimization method can be implemented in various ways. Representatively, the method may be divided into a method of relocating uplink resources and a method of allocating DCH services upon admission.

The method of relocating the DCH resource is a method of changing an existing code / slot structure to construct a more efficient code / slot structure during a call of the DCH service. Idle RUs can be relocated with an optimal structure to support HSUPA, thus enabling efficient HSUPA resource allocation after resources are relocated. However, as a disadvantage, there is a problem in that overhead due to the rearrangement of radio resources increases. In particular, since resource relocation for the DCH requires complex signaling between the RNC and the UE, the probability that the call of the UE is interrupted during resource relocation may be increased.

In the sequential DCH resource allocation method, the sequential DCH resource allocation is a method of sequentially allocating empty RUs based on a code or a slot when allocating radio resources for a new call. The sequential allocation method may be referred to as a method of allocating resources for a DCH service according to a predetermined rule. This approach avoids the discontinuous splitting of code / slots, which effectively supports resource allocation. The sequential resource allocation method may not optimize the code / slot structure of the idle RU as compared to the resource relocation method, but it is determined that it is the best implementation method that can be implemented in a commercial system.

The present invention provides a resource allocation method applicable to the sequential DCH resource allocation method.

7 is a flowchart illustrating a method for allocating dedicated resources for uplink transmission of a base station according to an embodiment of the present invention.

Referring to FIG. 7, the base station 430 according to the present invention receives a dedicated resource service request from the user terminal 410 (S702).

Accordingly, the base station 430 sequentially searches for empty RU resources in the timeslot for dedicated resource service (S704).

Subsequently, if there is an empty RU resource (S706-Yes), the base station 430 determines whether the higher code is available while sequentially decreasing the spreading factor (SF) in the code tree structure (S708).

Subsequently, the base station 430 selects a code in which the mother code is blocked among the available codes of the higher code and assigns the code to the user terminal (S710).

In this case, when the additional mother code is required, the base station 430 allocates the uplink code blocked in the adjacent timeslot to the user terminal 410.

In addition, the base station 430 allocates an uplink resource to the user terminal 410 from a time slot in which the voice service is least supported or from a time slot in which the voice service is most supported.

8 is a diagram illustrating an example of resource allocation optimized according to a dedicated resource allocation method for uplink transmission according to an embodiment of the present invention.

As illustrated in FIG. 8, even when the same number of idle RUs remains, resource allocation for HSUPA may be more efficiently performed if the pattern of RUs is uniform. Since consecutive codes can be used and a plurality of time slots can be used, in the example of FIG. 8, 24 RUs and 4 RUs can be allocated. Therefore, since only four RUs cannot be allocated, it can be seen that they are very efficient compared to the pattern shown in FIG. 1.

Since the voice service uses a code having SF = 8 as uplink, a total of eight services per slot can be supported simultaneously. Since a method of arbitrarily allocating an SF = 8 code not used in a specific time slot reduces the use efficiency of HSUPA resources, it is necessary to secure a small SF code using the structure of an uplink code tree. Similar methods can be applied to other DCH services.

In FIG. 8, first, if C (i, j) code is occupied by another DCH service, C (i, j) = 1 and C (i, j) = 0 if empty. First, in order to search for an uplink resource for a voice service, an empty SF = 8 code is searched one by one in a corresponding time slot. If it finds an empty SF = 8 code, it additionally checks the availability of higher codes in the structure of the code tree by reducing SF. That is, the code in which the mother code is blocked is first selected from the available SF = 8 codes.

 For example, consider the case where C (8, 2) is occupied, C (4, 1) is blocked and C (4, 2) is available. Among the codes of C (4, 1) and C (4,2), SF = 8 codes of C (8, 3), C (8, 4) and C (8, 5) can be used. One can be selected and assigned to the voice service. However, if C (8, 4) is selected, C (4, 2) cannot be used in HSUPA because C (4, 2) codes are blocked together with C (4, 1). On the other hand, if you select C (8, 3), you can still use the C (4, 2) code, so that code can be used in HSUPA. Therefore, the uplink code selection method described with reference to FIG. 8 may be referred to as a method capable of maximally securing resources for HSUPA by preventing additional allocation of mother codes. However, when additional code allocation is required, SF = 8 codes used in adjacent time slots are allocated to ensure continuous HSUPA resources.

Next, it is necessary to determine a time slot in which the aforementioned uplink radio resource selection method is performed. Since the voice service needs to be transmitted using only one SF = 8 code in 5 ms units, multiple time slots do not need to be used for the voice service. There are two ways to select a time slot for voice service depending on the HSUPA resource allocation policy. First, if you want to allocate idle resources for HSUPA in a plurality of time slots, it is necessary to distribute the DCH resources. However, if you want to secure a lot of HSUPA resources in a specific time slot, you need to concentrate the DCH resources in a specific time slot. Therefore, uplink DCH resources may be allocated in the time slots in which the first voice service is least supported, or uplink DCH resources may be allocated in the time slots in which the second voice service is most supported.

As described above, according to the present invention, when a service using a fixed dedicated radio resource occurs in a high-speed wireless communication system, an empty RU is sequentially allocated based on a code or a slot, thereby increasing utilization of uplink radio resources. A dedicated resource allocation system, a dedicated resource allocation method for uplink transmission thereof, and a base station and a dedicated resource allocation method for uplink transmission thereof can be realized.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention can be applied to a TDD based HSUPA system for allocating uplink resources for voice service.

In addition, the present invention can be applied to a radio resource allocation service and system for a high speed uplink packet service.

In addition, the present invention can be applied to a TD-SCDMA system using OVSF as a channelization code to ensure orthogonality between physical channels.

In addition, when a service using a fixed radio resource occurs, the present invention can be applied to a system and a service for allocating an uplink code and a timeslot resource so as to maximize the HSUPA uplink radio resource.

1 is a diagram illustrating an example of a TD-SCDMA subframe in which a conventional DCH service and a HSUPA service coexist.

2 is a diagram illustrating a basic frame structure of a TD-SCDMA physical channel applied to an embodiment of the present invention.

3 is a diagram illustrating a data transmission process adopted by HSUPA according to an embodiment of the present invention.

4 is a configuration diagram schematically showing the overall configuration of a dedicated resource allocation system according to an embodiment of the present invention.

5 is a configuration diagram schematically showing a functional block of a base station according to an embodiment of the present invention.

6 is a flowchart illustrating a dedicated resource allocation method for uplink transmission according to an embodiment of the present invention.

7 is a flowchart illustrating a method for allocating dedicated resources for uplink transmission of a base station according to an embodiment of the present invention.

8 is a diagram illustrating an example of resource allocation optimized according to a dedicated resource allocation method for uplink transmission according to an embodiment of the present invention.

9 illustrates generation of OVSF using Walsh code among channelization codes of TD-SCDMA according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

400: dedicated resource allocation system 410: user terminal

420: communication network 430: base station

510: communication unit 520: resource allocation unit

530: scheduler 540: control unit

Claims (9)

Selecting the timeslot with the lowest or most dedicated channel call in HSUPA service, and selecting uplink code for dedicated channel service in specific time slot, selects to prevent blocking of additional mother code and allocates uplink resources. Base station; And A user terminal which requests a dedicated resource service to the base station, receives an uplink resource for the dedicated channel service from the base station, and transmits data to the base station through the base station; Dedicated resource allocation system comprising a. A communication unit for communicating with a user terminal; A resource allocator for allocating an uplink resource to the user terminal; A scheduler for scheduling a data packet according to a dedicated channel service to the user terminal; And A controller configured to sequentially search for empty resources in a timeslot for the dedicated channel service when the dedicated channel service is provided to the user terminal and to sequentially allocate the empty resources through the resource allocator; Base station comprising a. The method of claim 2, The controller selects a time slot having the lowest number of calls of the dedicated channel service or a time slot having the largest number of calls of the dedicated channel service whenever a call of the dedicated channel service is generated. The method of claim 2, The control unit allocates an uplink code used in a neighboring timeslot when additional mother code is needed when selecting an uplink code for the dedicated channel service in a specific timeslot. A dedicated resource allocation method for uplink transmission of a system including a user terminal and a base station, (a) the user terminal requesting a dedicated channel service from the base station; (b) sequentially searching for empty RU resources in the timeslot for the dedicated channel service; (c) sequentially allocating the empty RU resources to prevent further allocation of mother codes; And (d) the base station notifying the user terminal of the allocated RU resource using an E-AGCH; Dedicated resource allocation method for uplink transmission comprising a. A dedicated resource allocation method for uplink transmission of a base station providing a dedicated resource service to a user terminal, (a) receiving a request for dedicated resource service from the user terminal; (b) sequentially searching for empty RU resources in the timeslot for the dedicated resource service; (c) if the empty RU resource is found, sequentially checking the availability of higher codes while sequentially decreasing a spreading factor (SF) in a code tree structure; And (d) selecting a code in which a mother code is blocked among available codes of the higher code and assigning the code to the user terminal; Dedicated resource allocation method for uplink transmission of the base station comprising a. The method of claim 6, If it is necessary to use the additional mother code in the step (d), dedicated resource allocation method for uplink transmission of the base station, characterized in that for assigning the uplink code blocked in the adjacent timeslot to the user terminal. The method of claim 6, The step (d) is a dedicated resource allocation method for uplink transmission of the base station, characterized in that to allocate the uplink resources to the user terminal in the timeslot that the least voice service is supported. The method of claim 6, The step (d) is a dedicated resource allocation method for uplink transmission of the base station, characterized in that the allocation of the uplink resources to the user terminal from the timeslot is most supported voice service.

Images