KR101448980B1 - Mobile telecomminication system for allocating wireless resources dynamically, and method thereof - Google Patents

Abstract

In the TD-SCDMA communication system, when allocating radio resources to mobile communication terminals located in a coverage area of a base station, a time slot and a channel code for the downlink are allocated to each mobile communication terminal in a redundant manner, And more particularly, to a mobile communication system and method for dynamically allocating radio resources.

A mobile communication system according to the present invention is a dynamic resource allocation system including a base station controller allocating radio resources to a mobile station located in an area of a base station through the base station, A mobile terminal for performing location registration by transmitting to the base station and allocating the radio resources through the base station; And a base station controller for the mobile terminal performing location registration through the base station to redundantly allocate the same radio resources to the radio resources allocated to other terminals.

According to the present invention, since the number of codes is dynamically selected in accordance with the change of the communication environment in the mobile communication system, the downlink transmission efficiency can be increased.

TDD, CDMA, base station, downlink, resource allocation, transmission efficiency, communication environment, time slot

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mobile telecommunication system for allocating wireless resources dynamically,

The present invention relates to a mobile communication system and method for dynamically allocating radio resources, and more particularly, to a mobile communication system and a method thereof for allocating radio resources to mobile communication terminals located in a jurisdiction area in a TD-SCDMA communication system, And more particularly, to a mobile communication system and method for dynamically allocating radio resources, which can increase the transmission efficiency of a downlink by allocating a time slot and a channelization code to each mobile communication terminal in a redundant manner.

In general, a radio resource allocation in a time division synchronous code division multiple access (TD-SCDMA) is a process of allocating a time slot and a channelization code to each mobile communication terminal.

In the TD-SCDMA system according to the conventional method, a radio resource to be used for data exchange between the mobile communication terminal and the base station must be clearly defined. Accordingly, each mobile communication terminal is allocated a time slot and a channelization code to be used by itself through a call setup process. If the radio resource allocated to the mobile communication terminal is changed, a reset procedure is performed. This process takes several seconds or more.

In addition, in order to adapt to a wireless channel that changes with time, it is necessary to dynamically adjust the transmission rate according to the state of the wireless link, and to support the function of continuously rearranging time slots and code resources so as to reduce the influence of interference when necessary There is a need. However, these dynamic functions are very difficult to apply to real commercial systems. This is because, in order to support dynamic resource reallocation, control information must be exchanged between the mobile communication terminal and the base station at any time, and this function is not provided in the standard specification. Moreover, the exchange of continuous control information may require additional transmission channels, which may result in a problem of reduced data transmission efficiency. Actually, the method of changing the time slot and the channelization code on a sub-frame basis increases the overhead of the system rather than the problem that the transmission of data is difficult to be performed in case of error in receiving the control information .

According to an aspect of the present invention, there is provided a TD-SCDMA communication system for allocating radio resources to mobile stations located in a coverage area of a base station in a TD-SCDMA communication system, And allocating radio resources to the plurality of mobile stations in a redundant manner, thereby increasing the transmission efficiency of the downlink.

According to an aspect of the present invention, there is provided a mobile communication system including: a base station for dividing and managing radio resources into time slots and channelization codes; a mobile communication terminal for dynamically allocating downlink radio resources for transmitting data to a mobile terminal A system comprising: a mobile terminal for requesting a service connection; And a base station apparatus allocating a downlink time slot and a plurality of channelization codes to the mobile terminal, wherein the plurality of channelization codes allocated to the mobile terminal includes at least one redundant code allocated to another mobile terminal, , The base station apparatus transmits data using a redundant code that is not used by the other mobile terminal in a time slot allocated to the mobile terminal.

In addition, the mobile terminal receives data using the plurality of channelization codes, determines the suitability of the received data for each channelization code, and discards the data received by the channelization code not used by the base station apparatus do.

In addition, the number of channelization codes allocated to the mobile terminal is greater than the number of channelization codes designated according to the type of the requested service.

In addition, the BS selects a predetermined number of channelization codes according to the type of the requested service in the time slot allocated to the MS, and adds the selected channelization code to the selected channelization code .

According to another aspect of the present invention, there is provided a base station apparatus for allocating radio resources to a mobile station located in an area covered by the base station apparatus, the base station apparatus comprising: a communication unit for communicating with the mobile station; A resource allocation unit for allocating a time slot and a channelization code for a downlink to the mobile station so as to allocate a dynamic physical channel to the mobile station; A resource allocation database storing information on resources allocated to the mobile terminal and resources not allocated thereto as resource tables; A data processor for processing voice signals and data to be transmitted to the mobile terminal according to a system of a mobile communication network; And a controller for controlling transmission / reception of the voice signal and data and allocation of radio resources to the mobile terminal.

In addition, the number of channelization codes allocated to the mobile terminal is larger than the number of channelization codes designated according to the type of service requested from the mobile terminal.

In addition, when the control unit receives a service connection request message including BSID information from the MS through the communication unit, the control unit allocates a time slot for a downlink allocated to another MS to the MS, The same time slot and channelization code as the code are duplicatedly allocated through the resource allocation unit.

In addition, the service connection request message includes a network layer service access point identifier (NSAPI), a TI, a PDP type, a PDP address, an access point name (APN), a QoS, and a PDP configuration option.

In addition, the resource allocation unit transmits a resource allocation message to the mobile terminal after receiving the radio resource for the mobile terminal, and receives the resource allocation setting completion message from the mobile terminal.

Then, in the time slot allocated to the mobile terminal, a number of channelization codes is selected according to the type of the requested service from the mobile terminal, and the selected channelization code includes redundant codes that are not used by other mobile terminals .

According to another aspect of the present invention, there is provided a dynamic resource allocation method of a base station apparatus allocating radio resources to a mobile station located in its own jurisdiction area, the method comprising the steps of: (a) Receiving a service connection request message from a terminal; (b) redundantly assigning the same radio resource to the mobile station as the radio resource allocated to another mobile station; And (c) transmitting a resource allocation message including the redundantly allocated radio resources to the mobile terminal.

The redundantly allocated radio resource includes a time slot and a channelization code.

In the step (b), a downlink time slot and a channelization code are allocated to the MS.

In the step (c), after the resource allocation message is transmitted to the mobile terminal, the resource allocation setting completion message is received from the mobile terminal.

According to another aspect of the present invention, there is provided a recording medium on which a program for processing a dynamic resource allocation method of a base station apparatus allocating radio resources to a mobile terminal located in its own jurisdiction region is recorded, a) receiving a service connection request message from the mobile terminal; (b) redundantly assigning the same radio resource to the mobile station as the radio resource allocated to another mobile station; And (c) transmitting a resource allocation message including the redundantly allocated radio resource to the mobile station.

Here, the redundantly allocated radio resource is a program including a time slot and a channelization code.

Also, the step (b) is a program for assigning a downlink time slot and a channelization code to the mobile terminal.

In the step (b), the base station controller transmits a resource allocation preparation message to the base station, receives a resource allocation preparation completion message from the base station, transmits a resource allocation execution message to the base station, The radio resources are allocated in a redundant manner.

In addition, (c) is a program for receiving the resource allocation setting completion message from the mobile terminal after transmitting the resource allocation message to the mobile terminal.

According to another aspect of the present invention, there is provided a mobile terminal including: a communication unit for communicating with a base station; The base station device receives the radio resource allocation information including the radio resources having the same radio resources as the radio resources allocated to the other terminals from the base station device and analyzes the time slot and the channelization code assigned to the radio resource allocation information A radio resource setting unit for setting a radio resource to transmit and receive data using the time slot and the channelization code; A storage unit for storing the radio resource allocation information and storing received data using the allocated time slot and channelization code through the communication unit; An adequacy checking unit for checking whether the received data is proper when the data is received using the allocated time slot and the channelization code, and outputting the result; And controlling the time slot and the channelization code to be set based on the radio resource allocation information received from the base station apparatus, determining the suitability of the received data using the time slot and the channelization code, And a control unit for deciding the operation mode.

In addition, the controller may transmit a service connection request message including BSID information to the base station apparatus, and may include a radio resource to which the same radio resource as the radio resource allocated to another terminal is redundantly allocated from the base station apparatus Lt; / RTI > resource allocation message.

In addition, the control unit transmits the resource allocation setup completion message to the base station apparatus after receiving the resource allocation message.

In addition, the number of channelization codes among the redundantly allocated radio resources is greater than the number of channelization codes designated according to the type of service requested to the base station apparatus.

The controller receives the data using a plurality of channelization codes, determines the suitability of the received data for each channelization code, and discards data received using the channelization code not used by the base station apparatus.

According to another aspect of the present invention, there is provided a recording medium on which a program for processing a dynamic resource allocation method of a mobile station, which is located in a jurisdiction area of a base station apparatus and is allocated with a radio resource from a base station apparatus, (a) transmitting a service connection request message including base station identification (BSID) information to the base station apparatus; (b) receiving a resource allocation message including a radio resource in which the same radio resource as the radio resource allocated to the other terminal is duplicated from the base station apparatus; And (c) transmitting the resource allocation setting completion message to the base station apparatus.

(D) receiving data from the base station apparatus using the redundantly allocated radio resource.

The step (d) may include receiving the data using the plurality of channelization codes, determining the suitability of the received data for each channelization code, and discarding the data received by the channelization code not used by the base station apparatus .

The step (d) is a program for judging the suitability of data by using a scramble code for the received data.

In the step (b), the number of channelization codes among the redundantly allocated radio resources is more than the number of channelization codes designated according to the type of service requested to the base station apparatus.

According to the present invention, since the number of codes is dynamically selected in accordance with the change of the communication environment in the mobile communication system, the downlink transmission efficiency can be increased. In addition, channel resources can be efficiently distributed to each terminal in the jurisdiction area by allocating the time slot and the channel code for the downlink to the mobile communication terminal in a redundant manner.

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 a configuration of a TD-SCDMA communication system to which a dynamic resource allocation method 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.

It is also possible to refer to a base station apparatus including the base stations 120 to 124 and the RNCs 130 and 132.

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. In some cases, two or more terminals can receive the same code, so duplicate reception can be made. Accordingly, since the mobile terminals 110 to 114 include, for example, scrambling code information that can determine whether the data is appropriate or not, the received data is subjected to suitability checking using the scrambling code information, And simply discard the data that is not yet available.

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 ".

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. That is, the RNCs 130 and 132 according to the present invention allocate the time slots and the channelization codes for the downlink in a redundant manner through 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 to 124 and then transmit a message (Commit message) to the mobile terminals 110 to 114 And receives a setup complete message of the RAB from the mobile terminals 110 to 114. The setup completion message of the radio access bearer RAB is received 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. Each frame is composed of two sub-frames with 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 boundary is 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 a 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. 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 block diagram schematically illustrating functional blocks of a base station controller according to an embodiment of the present invention.

4, a base station controller 130 according to the present invention includes a communication unit 410, a resource allocation unit 420, a resource allocation database (DB) 430, a data processing unit 440, and a control unit 450 .

The communication unit 410 communicates with the mobile terminals 110 to 114 via the base stations 120 to 126 or with the SGSN 140.

The resource allocation unit 420 allocates a time slot for the downlink and a time slot for the downlink to the mobile terminals 110 to 114 through the base stations 120 to 126 in order to allocate a dynamic physical channel to the mobile terminals 110 to 114. [ Assign duplicate codes.

The resource allocation database 430 stores 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 processing unit 440 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 450 controls transmission / reception of voice signals and data, and allocation of radio resources to the mobile terminals 110 to 114.

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

5, the mobile stations 110 to 114 to which the present invention is applied include a communication unit 510, a radio resource setting unit 520, a display unit 530, a storage unit 540, an adequacy checking unit 550, (560).

The communication unit 510 communicates with the base stations 120 to 124. Also, the communication unit 510 can communicate with the RNCs 130 and 132 via the base stations 120 to 124. [

The radio resource setting unit 520 receives the radio resource allocation information from the base stations 120 to 124 for the radio resources allocated to the mobile terminals 110 to 124 by the RNCs 130 and 132, And a channelization code, and sets a radio resource to transmit / receive data using the time slot and the channelization code.

The display unit 530 displays, for example, the operating state of the terminal.

The storage unit 540 stores the received packet data or stores data necessary for the operation of the terminal. In addition, the storage unit 540 stores information on the allocated time slots and channelization codes.

The adequacy checking unit 550 determines whether the received data is proper when the data is received using the same radio resources as other terminals, i.e., time slot and channelization code, and using the allocated time slot and channelization code And transmits the result to the control unit 560.

The controller 560 controls the operation of the terminal, controls the time slot and the channelization code to be set based on the radio resource allocation information received from the base station apparatus, and determines the suitability of the received data using the time slot and the channelization code And determines whether or not to receive the data. That is, the control unit 560 controls the data to be transmitted and received through the allocated time slot and the channelization code, and when the received data is judged not to be transmitted to itself by the adequacy checking unit 550, do.

6 is a flowchart illustrating a dynamic resource allocation method according to an embodiment of the present invention.

The present invention proposes a code allocation method in which a base station can dynamically allocate radio resources to a mobile station. In order to support more dynamic physical channel allocation, the proposed method allocates time slots and channelization codes for downlink to terminals repeatedly. That is, each physical channel is not monopolized by one terminal but is shared with other terminals. Since only the SF16 code is used for the downlink, a total of 16 channelization codes are allocated to terminals in duplication.

Referring to FIG. 6, when the mobile terminals 110 to 114 according to the present invention are located in areas covered by the base stations 120 to 124, their location information is transmitted to the base station to perform location registration, (PDP) context request message including BSID information received from the BS in the BS 120 to the SGSN 140 via the BS 120 and the RNCs 130 and 132 (S602) .

Here, the active PDP context request message includes a network layer service access point identifier (NSAPI), a TI, a PDP type, a PDP address, an access point name (APN), a QoS (quality of service) And network information of a TD-SCDMA network including a configuration option.

The SGSN 140 transmits an Assignment REQ message of the RAB to the RNC 130 upon receiving an active PDP context request message from the mobile terminals 110 to 114 in operation S604, .

Upon receiving the Assignment REQ message of the RAB, the RNCs 130 and 132 transmit a Radio Link Resource (RLR) Prepare message to the base stations 120 through 124 (S606).

The base stations 120 to 124 transmit a message informing the RNCs 130 and 132 that the radio link resource (RLR) is ready (S608).

Accordingly, the RNCs 130 and 132 transmit a message (Commit message) to allocate a radio link resource (RLR) to the base stations 120 to 124 (S610).

7, the RNCs 130 and 132 overlap radio resources, i.e., time slots and channelization codes, with respect to a plurality of mobile terminals 110 to 114 communicating with the base stations 120 to 124 (S612).

7 is a diagram illustrating radio resources related to time slots and channelization codes allocated to mobile stations according to an embodiment of the present invention. As shown in FIG. 7, the colored code means redundant codes allocated to various terminals. At this time, C (16, i) means the i-th code using the SF16 code. In the example of FIG. 7, C (16, 8) is shared by the terminal 2 and the terminal 3.

Means that a channelization code is shared among a plurality of terminals when a service is set up between a terminal and a base station. Although a duplicated code is assigned to a terminal, code collision between terminals is not a problem. This is because the codes transmitted by the base stations 120 to 124 do not overlap in the downlink. The base stations 120 to 124 determine the amount of data to be transmitted in consideration of the channel environment for each terminal and transmit the data using the channelization codes allocated to the terminals. For example, in FIG. 7, the base station uses four codes C (16,0) to C (16,3) for the terminal 1 and C (16,4) to C You can transmit using 4 codes. That is, the channelization codes used when data is transmitted from the base station are completely used for each terminal.

In the RNCs 130 and 132, a channelization code is allocated in consideration of a maximum transmission rate of a corresponding service at an initial stage of establishing a service with the terminal through the base stations 120 to 124. This process may include a channelization code pre-assigned to another terminal. After the service setting, the appropriate data transmission rate is determined by reflecting the amount of traffic of each terminal and the state of the wireless channel, and the data is transmitted to the target terminal by selecting the number of channelization codes matching the transmission rate. Through this process, the base station can appropriately distribute the radio resources, so that the transmission efficiency of the downlink can be greatly increased.

The RNCs 130 and 132 allocate the radio resources for the respective mobile stations 110 to 114 through the base stations 120 to 124 and then allocate the radio resources to the radio access bearer RAB Setup message to the mobile terminals 110 to 114 via the base stations 120 to 124 (S614).

In response to this, the mobile terminals 110 to 114 transmit a Setup Complete message to the RNC 130 via the base station 120 (S616).

Next, the RNC 130 sets up a radio access bearer (RAB) to the mobile terminals 110 to 114 and then transmits an Assignment RSP message of the RAB to the SGSN 140 (S618 ).

The SGSN 140 receives an active PDP context request message from the mobile terminals 110 to 114 to establish a radio access bearer (RAB) to the mobile terminals 110 to 114, And transmits a request message to the GGSN 150 (S620).

The GGSN 150 generates a PDP context message in response to a PDP context creation request and transmits a Create PDP Context RSP message to the SGSN 140 in response to the PDP context request (S622).

Accordingly, the SGSN 140 transmits a response message for an active PDP context request to the mobile terminals 110 to 114 via the RNCs 130 and 132 and the base stations 120 to 124 (S624).

Therefore, a traffic flow is performed between the mobile terminals 110 to 114 and the GGSN 150 via the base stations 120 to 124, the RNC 130, and the SGSN 140 to transmit and receive packet data (S626) .

Meanwhile, each of the mobile terminals 110 to 114, to which the time slot and the channelization code are allocated from the RNCs 130 and 132 via the base stations 120 to 124, receives only the codes allocated to the mobile terminals 110 to 114 and restores the data.

In some cases, since two or more terminals can receive the same code, duplicate reception is performed. However, since the received data includes information for determining whether the data is appropriate, The data that has not been transmitted to the user after the appropriateness test is checked through the adequacy checking unit 550 is simply discarded.

For example, in FIG. 7, if the base stations 120 to 124 transmit data to the terminal 1 using the codes C (16, 0) to C (16,5) 16, and 5 are also received at the terminal 2. However, since the information received by the terminal 2 can not pass the data adequacy check, the terminal 2 discards the corresponding data. However, since the data received by the terminal 1 can pass the adequacy check, the terminal 1 can normally recover the data.

That is, each terminal is allocated a code to be received at the beginning of the connection of the service, and when the call connection is completed and the data is received, the terminal continuously tracks the code allocated to the terminal. If the data is received through the code, the terminal receives the data and attempts to recover the data. If data recovery fails due to failure to pass the data adequacy check, the data is discarded.

In order to support the proposed method, a base station allocates a code through a call setup process and selects an appropriate code according to need, and transmits data to the terminal, so that the system change can be minimized.

As described above, according to the present invention, in a TD-SCDMA communication system, when allocating radio resources to mobile communication terminals located in a coverage area of a base station, a time slot and a channel code for a downlink are duplicated Thereby realizing a dynamic resource allocation system and method capable of increasing the transmission efficiency of the downlink.

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 in which time slots and channel codes of a downlink are allocated to a mobile terminal and data is transmitted and received through the time slots and channel codes. Also, the present invention can be applied to a mobile communication system in which the transmission rate is dynamically adjusted according to the state of a wireless link to adapt to a wireless channel that changes with time, and wireless resources are continuously relocated so as to reduce the influence of interference when necessary .

1 is a block diagram schematically illustrating a configuration of a TD-SCDMA communication system to which a dynamic resource allocation 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 block diagram schematically illustrating functional blocks of a base station controller according to an embodiment of the present invention.

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

6 is a flowchart illustrating a dynamic resource allocation method according to an embodiment of the present invention.

7 is a diagram illustrating radio resources related to time slots and channelization codes allocated to mobile stations according to an embodiment of the present invention.

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:

420: resource allocation unit 430: resource allocation DB

440: Data processing unit 450:

510: communication unit 520: radio resource setting unit

530: Display section 540: Storage section

550: suitability checking unit 560:

Claims (30)

delete delete delete delete delete A base station apparatus allocating a radio resource to a mobile station located in an area covered by the base station, A communication unit for communicating with the mobile terminal; A resource allocation unit for allocating a time slot and a channelization code for a downlink to the mobile station so as to allocate a dynamic physical channel to the mobile station; A resource allocation database storing information on resources allocated to the mobile terminal and resources not allocated thereto as resource tables; A data processor for processing voice signals and data to be transmitted to the mobile terminal according to a system of a mobile communication network; And A controller for transmitting and receiving the voice signal and data, and for allocating radio resources to the mobile terminal; . The method according to claim 6, Wherein the number of channelization codes allocated to the mobile terminal is greater than the number of channelization codes assigned according to the type of service requested from the mobile terminal. The method according to claim 6, When the control unit receives a service connection request message including BSID information from the MS through the communication unit, the control unit transmits a time slot and a channelization code for a downlink allocated to another MS to the MS, And allocates the same time slot and channelization code redundantly through the resource allocation unit. 9. The method of claim 8, Wherein the service connection request message includes a network layer service access point identifier (NSAPI), a TI, a PDP type, a PDP address, an access point name (APN), a QoS, and a PDP configuration option. The method according to claim 6, Wherein the resource allocation unit transmits a resource allocation message to the MS after allocating a radio resource to the MS, and receives the resource allocation setting completion message from the MS. The method according to claim 6, The mobile terminal selects a specified number of channelization codes according to the type of the requested service from the mobile terminal in the time slot allocated to the mobile terminal, and the selected channelization code includes a duplicate code not used by other mobile terminals . A dynamic resource allocation method of a base station apparatus allocating radio resources to a mobile station located in its own jurisdiction area, (a) receiving a service connection request message from the mobile terminal; (b) redundantly assigning the same radio resource to the mobile station as the radio resource allocated to another mobile station; And (c) transmitting a resource allocation message including the redundantly allocated radio resource to the mobile terminal; / RTI > Wherein the number of channelization codes included in the redundantly allocated radio resources is greater than the number of channelization codes specified according to a type of service requested from the mobile terminal. 13. The method of claim 12, Wherein the redundantly allocated radio resource includes a time slot and a channelization code. 13. The method of claim 12, Wherein the step (b) allocates a downlink time slot and a channelization code to the mobile station. 13. The method of claim 12, Wherein the step (c) comprises receiving a resource allocation setup completion message from the mobile station after transmitting the resource allocation message to the mobile station. A storage medium storing a computer-readable program for processing a dynamic resource allocation method of a base station apparatus allocating radio resources to a mobile terminal located in its own jurisdiction area, (a) receiving a service connection request message from the mobile terminal; (b) redundantly assigning the same radio resource to the mobile station as the radio resource allocated to another mobile station; And (c) transmitting a resource allocation message including the redundantly allocated radio resource to the mobile terminal; Lt; / RTI > Wherein the number of channelization codes included in the redundantly allocated radio resources is greater than the number of channelization codes specified according to a type of a service requested from the mobile terminal. 17. The method of claim 16, Wherein the redundantly allocated radio resource includes a time slot and a channelization code. 17. The method of claim 16, Wherein the step (b) allocates a downlink time slot and a channelization code to the mobile terminal. 17. The method of claim 16, In step (b), the base station controller transmits a resource allocation preparation message to the base station, receives a resource allocation preparation completion message from the base station, transmits a resource allocation execution message to the base station, Wherein the radio resource is allocated in a redundant manner. 17. The method of claim 16, Wherein the step (c) comprises receiving the resource allocation setting completion message from the mobile terminal after transmitting the resource allocation message to the mobile terminal. A communication unit for communicating with the base station apparatus; The base station device receives the radio resource allocation information including the radio resources having the same radio resources as the radio resources allocated to the other terminals from the base station device and analyzes the time slot and the channelization code assigned to the radio resource allocation information A radio resource setting unit for setting a radio resource to transmit and receive data using the time slot and the channelization code; A storage unit for storing the radio resource allocation information and storing received data using the allocated time slot and channelization code through the communication unit; An adequacy checking unit for checking whether the received data is proper when the data is received using the allocated time slot and the channelization code, and outputting the result; And Wherein the control unit controls the time slot and the channelization code to be set based on the radio resource allocation information received from the base station apparatus, determines the suitability of the received data using the time slot and the channelization code, ; . 22. The method of claim 21, The control unit transmits a service connection request message including base station identification (BSID) information to the base station apparatus, and transmits a service allocation request message including a resource including a radio resource And receives the allocation message. 23. The method of claim 22, Wherein the control unit, after receiving the resource allocation message, transmits the resource allocation setting completion message to the base station apparatus. 22. The method of claim 21, Wherein the number of channelization codes among the redundantly allocated radio resources is greater than the number of channelization codes specified according to a type of a service requested to the base station apparatus. 22. The method of claim 21, Wherein the controller receives data using a plurality of channelization codes, determines the suitability of the received data for each channelization code, and discards data received using the channelization code not used by the base station apparatus Mobile terminal. A storage medium storing a computer-readable program for processing a dynamic resource allocation method of a mobile station located in a jurisdiction area of a base station apparatus and allocated with radio resources from a base station apparatus, (a) transmitting a service connection request message including base station identification (BSID) information to the base station apparatus; (b) receiving a resource allocation message including a radio resource in which the same radio resource as the radio resource allocated to the other terminal is duplicated from the base station apparatus; And (c) transmitting the resource allocation setting completion message to the base station apparatus; Lt; / RTI > Wherein the number of channelization codes among the redundantly allocated radio resources is greater than the number of channelization codes specified according to a type of a service requested by the base station apparatus, in the step (b) Stored storage medium. 27. The method of claim 26, (d) receiving data from the base station apparatus using the redundantly allocated radio resources; Wherein the computer-readable storage medium stores the computer-readable program. 28. The method of claim 27, The step (d) may include receiving data using a plurality of channelization codes, determining the suitability of the received data for each channelization code, and discarding data received with the channelization code not used by the base station apparatus Characterized in that the computer-readable program is stored in a storage medium. 29. The method of claim 28, Wherein, in the step (d), the suitability of the data is determined using the scramble code for the received data. delete

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