KR101439288B1 - System and method for radio resource reservation for rapid recovery of communication services in high-speed wireless communication systems - Google Patents

Abstract

In the TD-SCDMA communication system, when a dedicated radio resource is allocated in a high-speed downlink packet access service and a dedicated radio resource is released because there is no data transmission for a certain period of time while a service is being provided, The radio resource reservation system allows the mobile station to transmit data through the remaining reserved resources without allocating a new radio resource when the original service is restored after being released. will be.

The present invention also provides a radio resource reservation system comprising: a mobile terminal located in an area of a base station and completing a data transmission service through a dedicated radio resource allocated from the base station and switching to a standby mode; And allocating the dedicated radio resource to the mobile terminal through the base station and then switching the dedicated radio resource to the first reserved resource when the mobile terminal does not use the data transmission service for a predetermined time or longer, And a base station controller for releasing the first reserved resource every time and controlling the use of the remaining first reserved resource without allocating a new radio resource when returning the data transmission service to the mobile terminal do.

According to the present invention, it is possible to return more quickly when the service in which the dedicated resource is temporarily released returns to the original state. Accordingly, rapid data transmission for the packet data service becomes possible, thereby improving the satisfaction of the user. In addition, when resources allocated to other services are insufficient, reserved resources can be additionally allocated, so that data can be transmitted quickly without deteriorating the performance of the system.

TDD, CDMA, RNC, dedicated resource, radio resource, reservation, time slot, idle, HSDPA, DCH, Cell, FACH, PCH, URA, DSCH, USCH, service,

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio resource reservation system and a radio resource reservation method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a radio resource reservation system and method for mobile communication, and more particularly, to a radio resource reservation system and method for mobile communication in a high-speed downlink packet access service in a Time Division Synchronous Code Division Multiple Access (TD- When a dedicated radio resource is released because there is no data transmission for a certain period of time while a dedicated radio resource is allocated and a service is being provided, the dedicated radio resource is not immediately released, but is released as a reserved resource, The present invention relates to a radio resource reservation system and method for transmitting data through a remaining reserved resource without allocating a new radio resource.

In general, a High-Speed Downlink Packet Access (HSDPA) provides a high-speed transmission rate for downlink and can be utilized for various services such as file downloading, Internet search, remote server access, have. HSDPA Frequency Division Duplexing (FDD) based on WCDMA has been studied since 2000 and a stable system has been developed. However, HSDPA TDD (Time Division Duplexing) for TD-SCDMA has not been developed yet All.

Since TD-SCDMA is based on TDD and TDMA, time slots and channelization codes are assigned to provide services to each terminal. However, since data packets are not generated continuously during the service, it is necessary to temporarily release the allocated resources or to save radio resources using common radio resources.

In general, because packet data occurs non-periodically, it is difficult to predict the generation characteristics of traffic, and data can be generated again at any time even if no data is generated for a while. Although it is possible to efficiently use radio resources through state transitions between operation modes, in order to return to the original state after the dedicated resources are once released, new resources should be allocated instead of the previously allocated dedicated resources. Accordingly, there is a problem that a considerable time delay occurs until a new dedicated resource is allocated.

DISCLOSURE Technical Problem In order to solve the above-described problems, in a TDD SCDMA communication system, when a dedicated radio resource is allocated in a high-speed downlink packet access service and a dedicated radio resource is released The radio resource is not released immediately but is released as a reserved resource and released in stages so that data can be transmitted through the remaining reserved resources without allocating a new radio resource when the original service is restored after the release, And an object of the present invention is to provide a radio resource reservation system and method.

According to an aspect of the present invention, there is provided a radio resource reservation system comprising: a mobile terminal located in an area of a base station, completing a data transmission service through a dedicated radio resource allocated from the base station and switching to a standby mode; And allocating the dedicated radio resource to the mobile terminal through the base station and then switching the dedicated radio resource to the first reserved resource when the mobile terminal does not use the data transmission service for a predetermined time or longer, And a base station controller for releasing the first reserved resource every time and controlling the use of the remaining first reserved resource without allocating a new radio resource when returning the data transmission service to the mobile terminal do.

In addition, the base station controller, when the dedicated radio resource is switched to the first reserved resource and counts a predetermined time, and when the data transmission service is not used even after a predetermined time elapses, the transmission rate of the first reserved resource The second reserved resource having the lower transmission rate is left and the other reserved resource is released.

In addition, the base station controller may further include a control unit that, when the data transmission service is not used even after a predetermined time has elapsed after the second reserved resource is left, 3 Reserved resources are left and other reserved resources are released.

Also, the base station controller may reserve a reservation resource having a lower transmission rate in a case where the data transmission service is not used every time a predetermined time elapses, .

The base station controller informs the mobile station of the information about the first reserved resource, and when the mobile station needs to transmit data, the mobile station requests data transmission using the first reserved resource.

According to another aspect of the present invention, there is provided a base station controller for reserving radio resources for a mobile station located in an area of a base station, the base station controller comprising: a communication unit for communicating with the mobile station via the base station; ; When the mobile station does not use the data transmission service for a predetermined period of time after the dedicated radio resource is allocated to the mobile station, the dedicated radio resource is switched to the first reserved resource, A resource allocation unit for releasing the reservation resource stepwise; A resource allocation database storing information on radio resources allocated to the mobile terminal and radio resources not allocated to the mobile terminal; A data processor for processing data or signals to be transmitted to the mobile terminal; And a controller for controlling the radio resources to be allocated to the mobile terminal.

The resource allocation unit allocates the dedicated radio resource to the first reserved resource and counts a predetermined time, and when the data transmission service is not used even after a predetermined time elapses, A second reserved resource having a lower transmission rate than the first reserved resource is allocated and the other reserved resource is released.

The resource allocation unit may allocate the second reserved resource to the second resource when the data transmission service is not used even after a predetermined time has elapsed since the allocation of the second reserved resource. 3 Reserved resources are allocated and other reserved resources are released.

In addition, the resource allocation unit may reserve reserved resources having a lower transmission rate in a case where the data transmission service is not used every time a predetermined time elapses after allocating the third reserved resource, n Only reserved resources are allocated and other reserved resources are released.

The control unit informs the mobile station of the information about the first reserved resource, and when data transmission is requested from the mobile station, the controller transmits the data through the data processing unit to the mobile station So that data can be transmitted to the user.

According to another aspect of the present invention, there is provided a radio resource reservation method for a system including a base station controller allocating a dedicated radio resource to a mobile terminal located in an area of a base station, a) switching the mobile terminal to a standby mode after transmitting / receiving data through the allocated dedicated radio resource; (b) checking whether the base station controller has no data or signal transmission from the mobile terminal; (c) when the base station controller does not immediately release the dedicated radio resource but switches to the first reserved resource and releases the first reserved resource step by step every time a predetermined time elapses, and allocates only the minimum reserved resource required for communication .

In the step (c), when the data or signal is not transmitted even after a predetermined time has elapsed after allocating the dedicated radio resource to the first reserved resource, A second reserved resource having a low transmission rate is allocated and another reserved resource is released.

In the step (c), when the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, a transmission rate lower than the transmission rate of the second reserved resource by one And the other reserved resources are released.

In addition, the step (c) may further include the step of, when the data or signal is not transmitted every time a predetermined time elapses after allocating the third reserved resource, leaving a reservation resource having a low transmission rate step by step Only the minimum reserved resources are allocated and other reserved resources are released.

After the step (c), when the base station controller notifies the mobile station of information on the minimum reserved resource and the mobile station requests data transmission, the base station controller transmits the minimum reserved resource And transmits the data to the mobile terminal.

According to another aspect of the present invention, there is provided a radio resource reservation method of a base station controller allocating dedicated radio resources to a mobile terminal located in an area of a base station, Confirming a state in which no data or signal is transmitted through the dedicated radio resource from the mobile terminal; And (b) switching to the first reserved resource without immediately releasing the dedicated radio resource, and releasing the first reserved resource stepwise in the absence of transmission of the data or signal even after a predetermined time elapses, And allocating only the minimum reserved resources.

In addition, in the step (b), when the dedicated radio resource is allocated as the first reserved resource and there is no transmission of the data or signal even after a predetermined time has elapsed, A second reserved resource having a low transmission rate is allocated and another reserved resource is released.

In the step (b), when the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, a transmission rate lower than the transmission rate of the second reserved resource by one And the other reserved resources are released.

In addition, the step (b) may further include the step of, when the data or signal is not transmitted every time a predetermined time elapses after the allocation of the third reserved resource, leaving a reservation resource having a low transmission rate step by step Only the minimum reserved resources are allocated and other reserved resources are released.

If the base station controller notifies the mobile station of information on the minimum reserved resource after the step (b) and the mobile station requests data transmission from the mobile station, the base station controller transmits the minimum reserved resource And transmits the data to the mobile terminal.

According to another aspect of the present invention, there is provided a recording medium on which a program for processing a radio resource reservation method of a base station controller allocating dedicated radio resources to a mobile terminal located in an area managed by a base station, Comprising the steps of: (a) confirming a state in which no data or signal is transmitted through the dedicated radio resource from the mobile terminal; And (b) switching to the first reserved resource without immediately releasing the dedicated radio resource, and releasing the first reserved resource stepwise in the absence of transmission of the data or signal even after a predetermined time elapses, A program for processing a step of allocating only a minimum reserved resource is recorded.

In addition, in the step (b), when the dedicated radio resource is allocated as the first reserved resource and there is no transmission of the data or signal even after a predetermined time has elapsed, A second reservation resource having a low transmission rate and releasing another reservation resource.

In the step (b), when the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, a transmission rate lower than the transmission rate of the second reserved resource by one And allocates a third reserved resource having the same priority and releases the other reserved resources.

In addition, the step (b) may further include the step of, when the data or signal is not transmitted every time a predetermined time elapses after the allocation of the third reserved resource, leaving a reservation resource having a low transmission rate step by step A program that allocates only the minimum reserved resources and releases the other reserved resources.

If the base station controller notifies the mobile station of information on the minimum reserved resource after the step (b) and the mobile station requests data transmission from the mobile station, the base station controller transmits the minimum reserved resource And transmits the data to the mobile terminal.

According to the present invention, it is possible to return quickly when the service in which the dedicated resource is temporarily released returns to the original state. Accordingly, rapid data transmission for the packet data service becomes possible, thereby improving the satisfaction of the user. In addition, when the resources to be allocated to other services are insufficient, reserved resources can be additionally allocated, so that data can be transmitted quickly without deteriorating the performance of the system.

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, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the TD-SCDMA communication system is one of the third generation (3G) mobile communication technologies combining the advantages of TDD (Time Division Duplexing) / TDMA (Time Division Multiple Access) and CDMA. The TD-SCDMA system was proposed by the China Wireless Technology Standard (CWTS) Group in 1998 based on the enormous potential of the Chinese mobile communications market. In March 2000, the 3GPP (The Third Generation Partnership Project), which is responsible for the standardization of the 3G mobile communication system, was established in Release 4 It was registered as a formal standard to be included.

TD-SCDMA technology combines TDD and TDMA technology with Synchronous CDMA technology. Thus, it has distinct advantages over other 3G technologies such as Wideband Code Division Multiple Access (WCDMA) and CDMA 2000, such as flexible frequency allocation, low cost transceiver implementation and simple network evolution from GSM systems.

It can be considered that TD-SCDMA technology is replaced by the TD-SCDMA scheme instead of the WCDMA scheme, rather than a completely different system from the existing WCDMA. In 3GPP, which actually creates standard specifications of WCDMA and TD-SCDMA, the remainder is treated the same as WCDMA except for the physical layer and the second layer of the air interface. Therefore, the basic structure of the TD-SCDMA is the same as the structure of the WCDMA system.

The most basic operating mode adopted in TD-SCDMA technology is TDD. That is, the service is provided using the same band without separating the frequencies for the uplink and the downlink. The gain obtained by using the TDD scheme is as follows.

Since the uplink and 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.

The TDD-SCDMA can use one RF module for transmission and reception, and it is possible to realize a low-cost transceiver. Since the propagation characteristics of the channels for the downlink and the uplink are very similar, the system capacity can be improved by utilizing the Smart Antenna technology and the Joint Detection technology.

1 is a block diagram schematically illustrating the configuration of a TD-SCDMA communication system to which a radio resource reservation method according to a location of a terminal according to an embodiment of the present invention is applied.

1, a TD-SCDMA communication system 100 according to the present invention includes a mobile station (MS) 110 to 114, a Node-B 120 to 124, a Radio Network A Serving GPRS Support Node (SGSN) 140, a Gateway GPRS Support Node (GGSN) 150, a home gateway And a Home Location Register (HLR)

The mobile terminals 110 to 114 transmit and receive voice signals through the base stations 120 to 124 and transmit the voice signals to the base stations 120 to 124, the RNCs 130 and 132, the SGSN 140 and the GGSN 150, The packet data can be received from the Internet network.

Also, the mobile terminals 110 to 114 receive only the codes assigned to themselves through the base stations 120 to 124, and recover the data. That is, when the mobile terminals 110 to 114 confirm the existence of data to be received through the HS-SCCH, the mobile terminals 110 to 114 receive the data through the HS-PDSCH (High-Speed Physical Downlink Shared Channel) . If the recovery of the received data is successful, ACK information is transmitted through the HS-SICH. Otherwise, NAK information is transmitted to notify the data transmission failure.

The mobile terminals 110 to 114 convert the quality of the downlink channel into a CQI value (0 to 30) and transmit the CQI value to the base stations 120 to 124 through a High-Speed Shared Information Channel (HS-SICH).

When the mobile terminals 110 to 114 do not start the service related to the data transmission after a predetermined time has elapsed since the time slots and the channel codes are allocated from the base stations 120 to 124, Time is counted by the timer, and the set radio resources are returned to the base stations 120 to 124 every predetermined time.

At this time, the mobile terminals 110 to 114 use a transmission rate lower than the transmission rate requested by the released service for the returned radio resource as a reference, and reserve the minimum radio resources without releasing all the allocated resources Resources.

The base stations 120 to 124 transmit voice signals or data related to mobile communication to the mobile terminal 110 as radio signals. At this time, the base stations 120 to 124 may be referred to as " Node-B ", and also referred to as "UTRAN (Universal Mobile Telecommunication System) Terrestrial Radio Access Network ".

In addition, the base stations 120 to 124 select a terminal to transmit data in the next transmission period (TTI), determine the number of channel codes to use, a modulation method, a channel coding rate and the like, and then transmit a High-Speed Shared Control Channel To the corresponding terminal.

When there is no data transmission to the mobile terminals 110 to 114, the base stations 120 to 124 count the time through the timer in order to prevent continuous resource occupation, and when the predetermined time has elapsed, Reserves channel resources with a transmission rate one step lower than the transmission rate required by the service, reserves the radio resources, and releases all others. Then, the base stations 120 to 124 continuously count the time, and if there is no data transmission even after a predetermined time elapses, only the minimum radio resources are reserved and all remaining radio resources are released. The base stations 120 to 124 start to transmit data by using the remaining reserved radio resources when the data is transmitted while the minimum radio resources are reserved and the service returns to the original state.

The RNCs 130 and 132 manage a plurality of base stations 120 to 124 and control transmission and reception of voice signals and data through the plurality of base stations 120 to 124. In addition, the RNCs 130 and 132 perform radio interval matching with the mobile terminals 110 to 114 and matching with the SGSN 140.

The RNCs 130 and 132 perform functions such as allocation, reassignment, and release of radio resources to a plurality of mobile terminals 110 to 114 in a region managed by the plurality of base stations 120 to 124.

The SGSN 140 manages the movement of the mobile terminals 110 to 114. To this end, the SGSN 140 includes a visitor location register (VLR) that stores location information of the mobile terminals 110 to 114.

The GGSN 150 manages a PDP address requested by the mobile terminals 110 to 114.

The HLR 160 is a database storing service profiles related to subscriber information of the mobile terminals 110 to 114. The HLR 160 stores a Mobile Identification Number (MIN) of the mobile terminals 110 to 114, , An electronic serial number (ESN), and a service type. The HLR 160 stores subscriber information including information on the base stations 120 to 124 and RNCs 130 and 132 where the mobile terminals 110 to 114 are located.

The mobile terminals 110 to 114 transmit an Activate PDP Context Request message to the base stations 120 to 124 and the RNCs 130 to 124 when the mobile terminals 110 to 114 are located in the coverage area of the base stations 120 to 124, 132 to the SGSN 140. Accordingly, the SGSN 140 transmits a Create PDP Context Request message to the GGSN 150 based on the received PDP context.

The GGSN 150 receives packet data from the Internet and provides packet data to the mobile terminals 110 to 114 via the SGSN 140, the RNCs 130 and 132, and the base stations 120 to 124.

When the SGSN 140 receives an active PDP context request message from the mobile terminals 110 to 114, the SGSN 140 transmits an RAB assignment request message to the RNC 130, (RAB) assignment message from the RNC 130 after assigning a radio access bearer (RAB) to the mobile terminals 110 to 114.

The RNCs 130 and 132 transmit a radio link resource (RLR) Prepare message to the base stations 120-124 and inform the base stations 120-124 that the radio link resource (RLR) Message.

The RNCs 130 and 132 transmit a message for committing a radio link resource (RLR) to the base stations 120 through 124 and then transmit a message (Commit message) to the mobile terminals 110 through 124 via the base stations 120 through 124, (RAB) setup message from the mobile terminals 110 to 114 and receives a Setup Complete message of the RAB from the mobile terminals 110 to 114. [

2 is a diagram illustrating a structure of a transmission frame in a TD-SCDMA communication system according to an embodiment of the present invention.

Referring to FIG. 2, a transmission frame in a TD-SCDMA communication system to which the present invention is applied has a length of 10 ms which is the same as 3GPP WCDMA. A super frame is composed of several frames, and each frame is composed of two sub-frames having a length of 5 ms. In particular, the basic unit for data transmission in TD-SCDMA is a sub-frame.

In a sub-frame, a downlink signal and an uplink signal coexist, and a point in time when a direction of transmission is changed is called a switching point. In TD-SCDMA, as shown in FIG. 2, there are always two switching points within one sub-frame. Of the seven time slots (TS), TS0 is always allocated in the downlink and TS1 is always allocated in the uplink. Since the data transfer direction of TS0 and TS1 is different, this point also becomes a switching point. The remaining time slots can freely adjust the length allocated to up / down to support asymmetric traffic.

In FIG. 2, a total of four time slots are assigned to the downlink and three time slots are allocated to the uplink. Since the direction of the link is switched between TS3 and TS4, this channel becomes another switching point. In the sub-frame, a special signal supporting the operation of the TDD system is added in addition to the seven time slots. This information is defined between TS0 and TS1, and each of DwPTS (Downlink Pilot TS), UpPTS (Uplink Pilot TS) , And a guard period (GP). The DwPTS is a signal for transmitting pilot information for downlink, and is used for downlink synchronization and initial cell search.

UpPTS is composed of 160 chips, 32 chips are GP, and the remaining 128 chips are used as SYNC. This SYNC signal is also used for the initial synchronization and random access procedure of the uplink and for the measurement of the adjacent cell in handover. GP is a guard period that prevents overlap between DwPTS and UpPTS signals and consists of 96 chips.

3 is a diagram illustrating an example of radio resource allocation in a TD-SCDMA communication system according to an embodiment of the present invention.

As shown in FIG. 3, in the TD-SCDMA, the number of channelization codes usable in each time slot is limited to a maximum of 16, thereby reducing the multiple access interference (MAI) . In addition, various spreading factors (SF) and multicodes are supported to support high data rates.

Accordingly, the spreading factors usable in the TD-SCDMA are SF1, SF2, SF4, SF8, and SF16, and the mobile terminals 110 to 114 can simultaneously receive one or more codes. In particular, only the SF16 code is used for the downlink. FIG. 3 shows an example of radio resource allocation for downlink in TD-SCDMA. Since SF16 codes are used in each time slot, a total of 16 channelization codes can be used, and the basic resource allocation unit becomes one code.

Various services supported in TD-SCDMA are subjected to proper time slot and proper channelization codes. The basic radio resources of the TD-SCDMA physical layer can be discretized into a Resource Unit (RU), which considers one SF16 code as a basic allocation unit. For example, if one service uses two SF16 channelization codes, this service requires 2RU of radio resources. In addition, the total RU for each link is determined according to the number of time slots allocated for downlink and uplink. For example, if the first two of the six time slots except for the first time slot are allocated to the uplink and the remaining four to the downlink, a total of 32 RUs for the uplink and a total of 64 RU for the downlink Can be regarded as being allocated. For example, SF1 corresponds to 16 RUs and SF4 corresponds to 4 RUs.

Since TD-SCDMA can utilize the advantages of TDMA and CDMA, allocatable physical resources are composed of three resource combinations: carrier frequency, time slot, and channelization code. In addition, since it can divide physical resources spatially by use of Adaptive Array, which is one of Smart Antenna technologies, it can support dynamic channel allocation, reallocation and cancellation using four types of radio resources. However, the actual TD-SCDMA system is not allocating / reallocating / releasing resources in every sub-frame or slot, but allocating / reallocating / releasing radio resources for a longer time. Therefore, in the TD-SCDMA, the radio resource allocation is implemented in the base station controller (RNC) 130, not in the base station.

TD-SCDMA defines the number of time slots and the number of codes to be allocated to various services.

Table 1 below shows allocation criteria of time slot and channelization codes for various mobile communication services.

service
Kinds Transmission speed Downlink Uplink cordage TS  Number RU cordage TS  Number RU Voice call 12.2 kbps SF16  x 2 One TS 2 RU SF8  x 1 One TS 2 RU Modem / Fax 28.8 kbps SF16  x 3 One TS 3 RU SF4  x 1 One TS 4 RU 57.6 kbps SF16  x 6 One TS 6 RU SF2  x 1 One TS 8 RU Video phone 64 kbps SF16  x 8 One TS 8 RU SF2  x 1 One TS 8 RU data 64 kbps SF16  x 8 One TS 8 RU SF2  x 1 One TS 8 RU 128 kbps SF16  x 14 One 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

As shown in Table 1, at least 2 RU of resources are required for most services. It should be noted that the allocated time slots and channelization codes for each service are not changed except for service re-establishment. Therefore, in the case of the downlink 64 k bps service, 8 channelization codes are used. Even if the amount of data decreases or increases, the number of the channels is continuously occupied without using the proper number of codes.

4 is a diagram illustrating a state transition between operation modes in a TD-SCDMA communication system according to an embodiment of the present invention.

In the standard specification of the TD-SCDMA communication system, a basic operation mode of the mobile terminal is defined. The operation mode is a concept of allocating an appropriate resource in consideration of the traffic generation characteristics and mobility of the mobile terminal, and is a process of finding an appropriate radio resource in each process of turning on the power, trying to make a call, and terminating the call.

The operation mode is largely divided into an Idle Mode and a Connected Mode. When a signaling connection is established between the mobile terminal and the network, the mobile terminal transitions from Idle Mode to Connected Mode. The Connected Mode can be classified into four states of CELL_DCH, CELL_FACH, CELL_PCH and URA_PCH according to the type of physical channel that the mobile terminal can use. Each operation mode is capable of transitioning to another mode.

The Idle Mode 410 When the user turns on the power, the mobile terminal automatically or manually selects the type of network to which the mobile terminal will connect and receives control information of a cell suitable for receiving the service. Since the mobile terminal of the idle mode 410 does not have a signaling connection with the network, it can be said that the reliable location information of the mobile terminal is not known in the network. When the mobile terminal establishes a signaling connection with the network, it transitions to Connected Mode.

The mobile station in the CELL_DCH 420 state can use the physical channel assigned to itself. A DCH (Dedicated Channel), a DSCH (Downlink Shared Channel), a USCH (Uplink Shared Channel), or the like is used as a transport channel. The CELL_DCH 420 state may be transitioned from the Idle Mode 410 or may be transited by allocating dedicated physical channels in the Cell_FACH 430 state. The Cell_DCH (420) state is suitable for high-speed data transmission and is also used for real-time service support. If the amount of data to be transmitted is not large, the UE can transition to the Cell_FACH 430 state. If the data transmission does not occur for a long time, the UE can transition to the Cell_PCH 440 or Cell_URA 450 state.

The CELL_FACH 430 state refers to a state in which a dedicated physical channel is not allocated to a mobile station and a common transport channel is used. However, it is possible to transfer data through a dedicated logical channel. Usually, it is used when the amount of data to be transmitted on the uplink / downlink is small. The mobile terminal receives downlink data through a Forward Access Channel (FACH) and uses Random Access Channel (RACH) when transmitting data upward. It may transition from the Idle Mode 410 and may transition to another state depending on the amount of traffic to be transmitted.

In the CELL_PCH 440 state, a dedicated channel is not allocated to the mobile terminal, and a dedicated logical channel can not be used. It may be transited to the Cell_PCH 440 if the mobile terminal in the Cell_FACH 430 state or the Cell_DCH 420 state has not transmitted data for a long time. The mobile terminal can receive the paging information through a paging channel (PCH). Since the observation of the PCH is performed only at a certain moment, the power consumption of the mobile terminal can be reduced more than the CELL_FACH 430 state.

The URA_PCH 450 is similar to the CELL_PCH 440 state, but may transition to the URA_PCH 450 state if the cell update process is frequent due to the large mobility of the mobile terminal. The UTRAN (UTRAN Registration Area) is an area consisting of one or several base stations, and the UTRAN is a location registration unit supporting large mobility of the mobile terminal. URAs are generally designed to overlap one another to prevent ping-pong effects due to movement of a mobile terminal, so a cell may belong to one or more URAs. The mobile terminal can confirm its own URA information from the URA list transmitted from each cell, and performs location registration through the URA Update procedure whenever the URA is changed. Since the location of the mobile terminal is managed at the URA level, a call signal is transmitted from all the cells included in the URA area in order to call the corresponding terminal.

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

5, a base station controller 130 according to the present invention includes a communication unit 510, a resource allocation unit 520, a resource allocation database (DB) 530, a data processing unit 540, and a control unit 550 .

The communication unit 510 communicates with the mobile terminals 110 to 114 via the base stations 120 to 126 or with the SGSN 140.

The resource allocation unit 520 allocates the time slots for the downlink and the time slots for the downlink to the mobile terminals 110 to 114 through the base stations 120 to 126 in order to assign dynamic physical channels to the mobile terminals 110 to 114. [ Allocate an episode.

In addition, the resource allocation unit 520 allocates a dedicated radio resource to the mobile stations 110 to 114 and then prevents continuous resource occupation when the mobile stations 110 to 114 do not use the data transmission service for a predetermined time or longer The dedicated radio resource is switched to the first reserved resource, and the first reserved resource is released step by step whenever a predetermined time elapses.

The resource allocation database 530 includes resources allocated to the mobile terminals 110 to 114 and resources not allocated thereto, that is, time slots and channelization codes allocated to the mobile terminals 110 to 114, And a channelization code are stored in a resource table as shown in FIG.

The data processor 540 processes voice signals and data to be transmitted to the mobile terminals 110 to 114 according to the processing method of a general mobile communication network.

The control unit 550 controls transmission / reception of voice signals and data, and allocation of radio resources to the mobile terminals 110 to 114. In addition, when the mobile terminal 110-114 returns the data transmission service after the dedicated radio resource is switched to the first reserved resource, the controller 550 does not allocate a new radio resource, .

6 is a block diagram schematically illustrating functional blocks of a mobile terminal according to an embodiment of the present invention.

6, the mobile terminals 110 to 114 to which the present invention is applied include a communication unit 610, an allocated resource analysis unit 620, a display unit 630, a storage unit 640, an adequacy checking unit 650, (660).

The communication unit 610 communicates with the base stations 120 to 124. In addition, the communication unit 610 can communicate with the RNCs 130 and 132 via the base stations 120 to 124.

The radio resource setting unit 620 transmits the allocated resource information to the mobile terminals 110 to 114 for the resources allocated to the mobile terminals 110 to 124 by the RNCs 130 and 132 The base station receives the allocated resource information, and sets a time slot and a channelization code allocated to the base station.

The display unit 630 displays, for example, an operation state of the terminal.

The storage unit 640 stores the received packet data or stores data necessary for the operation of the terminal. In addition, the storage unit 640 stores information on the assigned time slot and the channelization code.

The adequacy checking unit 650 determines whether the received data is proper when the data is received using another radio resource, i.e., a time slot and a channelization code, from another terminal, and transmits the result to the controller 660. [

The control unit 660 controls the operation of the terminal and controls transmission / reception of data through the allocated time slot and channelization code. When it is determined that the data received by the adequacy checking unit 650 is not transmitted to the terminal, And discards the received data.

7 is a flowchart illustrating a radio resource reservation method according to an embodiment of the present invention.

Referring to FIG. 7, when the mobile stations 110 to 114 according to the present invention are located in the coverage area of the base stations 120 to 124, the mobile terminals 110 to 114 transmit their terminal information to the RNCs 130 to 124 via the base stations 120 to 124, 132, and allocates dedicated radio resources, i.e., time slots and channelization codes, from the RNCs 130 and 132 and performs data transmission through the dedicated radio resources (S702).

That is, the mobile terminals 110 to 114 transmit data to the base stations 120 to 124 through dedicated radio resources allocated as shown in FIG. 3 in the Cell_DCH 420 of FIG. 4, As shown in Fig.

When the data transmission through the dedicated radio resource is completed, the mobile terminals 110 to 114 transmit a completion message to the RNCs 130 and 132 to notify that the data transmission is completed (S704).

4, the mobile terminals 110 to 114 transition from the Cell_DCH 420 state to the Idle Mode 410 state through the Cell_FACH 430 state, the Cell_PCH 440 state, or the URA_PCH 450 state (S706).

If there is no data transmission or signal transmission from the mobile terminals 110 to 114 after the RNCs 130 and 132 receive the data transmission completion notification, In order to prevent the occupation of resources, the dedicated radio resources are released. As shown in FIG. 3, dedicated radio resources for the mobile terminals 110 to 114, , The first reservation resource is switched and a certain time is counted (S708). FIG. 8 is a diagram illustrating radio resource return and reservation of remaining resources according to an exemplary embodiment of the present invention; FIG.

The RNCs 130 and 132 are provided with a timer function by the control unit 550 to count a predetermined time through the control unit 550 or to provide a timer function to the data processing unit 540, Time can be counted.

If there is no data or signal transmission from the mobile terminals 110 to 114 even after a predetermined time has elapsed, the RNCs 130 and 132 transmit the first reserved resource at a rate lower than the transmission rate of the service through the DCH The second reserved resource having the speed is left, and the remaining reserved resources except for the reserved resource left as shown in FIG. 8 are released (S710).

For example, a radio resource with downlink 128 Kbps uses 14 channelization codes, and when a certain time has elapsed through the time factor of the timer, the RNC 130, 132, Leaving eight channelization codes with a high transmission rate of 64 Kbps and releasing and returning six channelization codes.

After releasing the other reserved resources as described above, the RNCs 130 and 132 count a predetermined time using the timer function (S712). If there is no data or signal transmission from the mobile terminals 110 to 114 Only the third reserved resource having the next lowest transmission rate is released and other reserved resources are released (S714).

For example, as shown in FIG. 8, when a predetermined time elapses in eight channelization codes having 64 Kbps, the RNCs 130 and 132 reserve and reserve four channelization codes having the next highest transmission rate of 32 Kbps The other four channelization codes are released and returned.

In step S716, the RNCs 130 and 132 count a predetermined time using the timer function while leaving four channelization codes, and if there is no data or signal transmission from the mobile terminals 110 to 114 , The radio resource setting unit 620 leaves only the nth reservation resource as the minimum reservation resource and releases the remaining reservation resources as shown in FIG. 8 (S718).

For example, as shown in FIG. 8, the RNCs 130 and 132 reserve four channelization codes having 32 Kbps, and when a predetermined time elapses, The other two channelization codes are released and returned.

The RNCs 130 and 132 transmit the two channelization codes reserved with the minimum radio resources to the mobile terminals 110 to 114 via the base stations 120 to 124, 114), a message notifying the n-th reservation resource caused by the minimum reservation (S720).

Accordingly, when data transmission is required by the user, the mobile terminals 110 to 114 transmit data using the two channelization codes allocated as the minimum radio resources through the radio resource setting unit 620, 120 to 124 (S722).

Accordingly, the RNCs 130 and 132 transmit data to the mobile terminals 110 to 114 via the base stations 120 to 124 using the minimum reserved resources through the resource allocation unit 520, (S724). ≪ / RTI >

Here, when the data transmission service is restored to its original state after the dedicated radio resources for the mobile terminals 110 to 114 are released, the RNCs 130 and 132 transmit data using the remaining reserved resources . If the amount of reserved resources is smaller than the amount of reserved resources before releasing the dedicated radio resources, the RNCs 130 and 132 gradually obtain resources for the mobile terminals 110 to 114. [ In addition, if the amount of remaining radio resources is insufficient when a call acceptance request for a new service is received, the RNCs 130 and 132 can utilize the reserved resources of the plurality of services that are not transmitting data. Therefore, when the service in which all reservation resources are released starts transferring data, a new dedicated resource must be allocated again.

Meanwhile, the present invention can record a program for processing a radio resource reservation method of a base station controller allocating a dedicated radio resource to a mobile terminal located in an area occupied by the base station, on a recording medium. Here, the program may include the steps of: (a) confirming that the mobile station does not transmit data or signals through the dedicated radio resource; And (b) after allocating the dedicated radio resource to the mobile station, if the mobile station does not use the data transmission service for a predetermined time or longer, the dedicated radio resource is switched to the first reserved resource, A step of releasing the first reserved resource step by step is recorded.

In addition, in the step (b), when the dedicated radio resource is allocated as the first reserved resource and there is no transmission of the data or signal even after a predetermined time has elapsed, A second reservation resource having a low transmission rate and releasing another reservation resource.

In the step (b), when the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, a transmission rate lower than the transmission rate of the second reserved resource by one And allocates a third reserved resource having the same priority and releases the other reserved resources.

In addition, the step (b) may further include the step of, when the data or signal is not transmitted every time a predetermined time elapses after the allocation of the third reserved resource, leaving a reservation resource having a low transmission rate step by step The program that allocates only the nth reservation resource and releases the other reservation resources.

If the base station controller notifies the mobile station of the information about the first reserved resource after the step (b) and the mobile station requests data transmission from the mobile station, the base station controller transmits the first reservation And transmits data to the mobile terminal using resources.

As described above, according to the present invention, when dedicated radio resources are allocated in a high-speed downlink packet access service of a TD-SCDMA communication system and dedicated radio resources are released due to no data transmission for a predetermined period of time, And to transmit data through a minimum radio resource that has not been released without allocating a new radio resource when data is to be transmitted after leaving only a minimum amount of radio resources to be released .

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

The present invention can be applied to a mobile communication system that allocates a dedicated radio resource for providing a data transmission service to a mobile terminal. The present invention is also applicable to a mobile communication system that releases dedicated radio resources in the absence of data transmission.

1 is a block diagram schematically illustrating a configuration of a TD-SCDMA communication system to which a radio resource reservation method according to an embodiment of the present invention is applied.

2 is a diagram illustrating a structure of a transmission frame in a TD-SCDMA communication system according to an embodiment of the present invention.

3 is a diagram illustrating an example of radio resource allocation in a TD-SCDMA communication system according to an embodiment of the present invention.

4 is a diagram illustrating a state transition between operation modes in a TD-SCDMA communication system according to an embodiment of the present invention.

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

6 is a block diagram schematically illustrating functional blocks of a mobile terminal according to an embodiment of the present invention.

7 is a flowchart illustrating a radio resource reservation method according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating radio resource return and reservation of remaining resources according to an exemplary embodiment of the present invention; FIG.

Description of the Related Art

100: TD-SCDMA communication system 110 to 114: mobile terminal

120 to 124: Base Station 130, 132: Base Station Controller

140: SGSN 150: GGSN

HLR: 160 410: Idle Mode

420: Cell_DCH 430: Cell_FACH

440: Cell_PCH 450: URA_PCH

510: communication unit 520: resource allocation unit

530: Resource allocation DB 540: Data processing unit

550: control unit 610:

620: radio resource setting unit 630:

640: Storage unit 650: Suitability checker

660:

Claims (25)

A mobile terminal located in an area controlled by a base station and switching to a standby mode after completing a data transmission service through a dedicated radio resource allocated from the base station; And When the dedicated radio resource is allocated to the mobile station through the base station and the mobile station does not use the data transmission service for a predetermined period of time, the dedicated radio resource is switched to the first reserved resource, A base station controller for releasing the first reservation resource step by step and controlling the use of the remaining first reservation resource without allocating a new radio resource when the data transmission service is returned to the mobile terminal; The radio resource reservation system comprising: The method according to claim 1, Wherein the base station controller switches the dedicated radio resource to the first reserved resource and counts a predetermined time, and when the data transmission service is not used even after a predetermined time elapses, And releasing another reserved resource while leaving a second reserved resource having a lower transmission rate. 3. The method of claim 2, Wherein the base station controller is further configured to transmit a third reservation having a transmission rate that is one step lower than the transmission rate of the second reservation resource when the data transmission service is not used even after a predetermined time has elapsed after leaving the second reservation resource And releases the other reserved resources while leaving the resources. The method of claim 3, Wherein the base station controller is configured to release only the reserved resources having a lower transmission rate than the reserved resources remaining at the current point in time and release the other reserved resources step by step whenever the predetermined time has elapsed and the data transmission service is not used. Resource reservation system. The method according to claim 1, The base station controller notifies the mobile station of information on the first reserved resource, Wherein the mobile station requests data transmission using the first reserved resource when data transmission is required. 1. A base station controller for reserving a radio resource for a mobile terminal located in an area covered by a base station, A communication unit for communicating with the mobile terminal via the base station; After allocating a dedicated radio resource to the mobile terminal, switching the dedicated radio resource to a first reserved resource when the mobile terminal does not use the data transmission service for a predetermined time or longer, A resource allocation unit for releasing resources in a stepwise manner; A resource allocation database storing information on radio resources allocated to the mobile terminal and radio resources not allocated to the mobile terminal; A data processor for processing data or signals to be transmitted to the mobile terminal; And A controller for controlling the radio resources to be allocated to the mobile terminal; / RTI > The method according to claim 6, Wherein the resource allocation unit allocates the dedicated radio resource to the first reserved resource and counts a predetermined time, and when the data transmission service is not used even after a predetermined time elapses, The base station controller allocates a second reservation resource having a lower transmission rate and releases another reservation resource. 8. The method of claim 7, Wherein when the data transmission service is not used even after a predetermined time has elapsed after allocating the second reserved resource, the resource allocator allocates a third reservation having a transmission rate one step lower than the transmission rate of the second reserved resource, Allocating resources and releasing other reserved resources. 9. The method of claim 8, Wherein the resource allocation unit reserves only the reserved resources having a lower transmission rate than the reserved resources remaining at the current point in a stepwise manner every time a predetermined time elapses after the allocation of the third reserved resource and the data transmission service is not used, And releases the reserved resource. The method according to claim 6, Wherein the control unit notifies the mobile station of the information about the first reserved resource and transmits data to the mobile station via the data processing unit using the first reserved resource when data transmission is requested from the mobile station, To the base station controller. A radio resource reservation method of a system including a base station controller allocating a dedicated radio resource to a mobile terminal located in an area covered by a base station, (a) switching the mobile terminal to a standby mode after transmitting / receiving data through the allocated dedicated radio resource; (b) checking whether the base station controller has no data or signal transmission from the mobile terminal; (c) if the base station controller allocates the dedicated radio resource to the mobile station and then the dedicated radio resource is switched from the mobile station to the first reserved resource when the mobile station does not use the data transmission service for a predetermined period of time, Releasing the first reserved resource step by step every time it elapses; Wherein the radio resource reservation method comprises: 12. The method of claim 11, Wherein the step (c) includes the steps of: allocating the dedicated radio resource to the first reserved resource, and when the data or signal is not transmitted even after a predetermined time has elapsed, Allocating a second reservation resource having a transmission rate and releasing another reservation resource. 13. The method of claim 12, Wherein the step (c) includes: if the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, And allocating three reserved resources and releasing other reserved resources. 14. The method of claim 13, The method of claim 1, wherein, in the step (c), whenever a predetermined time elapses after the allocation of the third reserved resource and no data or signal is transmitted, only the reserved resource having a lower transmission rate than the reserved resource And releasing other reserved resources. 12. The method of claim 11, If the base station controller notifies the mobile station of the information about the first reserved resource after the step (c) and the base station controller requests the data transmission from the mobile station, the base station controller transmits the first reserved resource And transmitting the data to the mobile station using the data. A radio resource reservation method of a base station controller allocating a dedicated radio resource to a mobile terminal located in an area controlled by a base station, (a) confirming a state in which no data or signal is transmitted through the dedicated radio resource from the mobile terminal; And (b) after allocating the dedicated radio resource to the mobile station, if the mobile station does not use the data transmission service for a predetermined time or longer, the dedicated radio resource is switched to the first reserved resource, Releasing the first reserved resource stepwise; And transmitting the radio resource reservation information to the base station controller. 17. The method of claim 16, The method of claim 1, wherein, in the step (b), when the data or signal is not transmitted even after a predetermined time has elapsed after allocating the dedicated radio resource to the first reserved resource, Allocating a second reservation resource having a transmission rate and releasing another reservation resource. 18. The method of claim 17, Wherein the step (b) includes: if the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, And allocating the third reserved resource and releasing another reserved resource. 19. The method of claim 18, In the step (b), when a predetermined time elapses after allocating the third reserved resource and the data or signal is not transmitted, only the reserved resource having a transmission rate lower than the reserved resource remaining at the current point in time is left And releases the other reserved resources. 17. The method of claim 16, If the base station controller notifies the mobile station of the information about the first reserved resource after the step (b) and the base station controller requests the data transmission from the mobile station, the base station controller transmits the first reserved resource And transmits the data to the mobile terminal using the radio resource reservation method. A program for processing a radio resource reservation method of a base station controller allocating a dedicated radio resource to a mobile terminal located in an area covered by a base station, (a) confirming a state in which no data or signal is transmitted through the dedicated radio resource from the mobile terminal; And (b) after allocating the dedicated radio resource to the mobile station, if the mobile station does not use the data transmission service for a predetermined time or longer, the dedicated radio resource is switched to the first reserved resource, Releasing the first reserved resource stepwise; Is recorded on the recording medium. 22. The method of claim 21, The method of claim 1, wherein, in the step (b), when the data or signal is not transmitted even if the dedicated radio resource is allocated as the first reserved resource and a predetermined time elapses, Allocates a second reserved resource having a speed and releases another reserved resource. 23. The method of claim 22, Wherein the step (b) includes: if the data or signal is not transmitted even after a predetermined time has elapsed after the allocation of the second reserved resource, 3 < / RTI > reserved resources and releases the other reserved resources. 24. The method of claim 23, In the step (b), when a predetermined time elapses after allocating the third reserved resource and the data or signal is not transmitted, only the reserved resource having a transmission rate lower than the reserved resource remaining at the current point in time is left And releases the other reserved resources. 22. The method of claim 21, If the base station controller notifies the mobile station of the information about the first reserved resource after the step (b) and the base station controller requests the data transmission from the mobile station, the base station controller transmits the first reserved resource And transmits the data to the mobile terminal.

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