KR100625245B1 - METHOD FOR Downlink BURST PROFILE CHANGING OF HIGH-SPEED POTABLE INTERNET SYSTEM - Google Patents

Abstract

The present invention relates to a method for changing a downlink burst profile of a high-speed portable Internet system, comprising: a) a base station receiving a DBPC ranging code from a mobile subscriber station in a call; b) Using the received DBPC ranging code, the base station reallocates the code_count_index corresponding to the traffic connection currently being performed, and if the reallocated CODE_COUNT_INDEX is changed, the corresponding code count (CODE_COUNT). Reassign the CDMA code by c) using the reallocated CDMA code information as DBPC request (DBPC-REQ) message allocation information and transmitting the UL-MAP information to the terminal; d) receiving a processed DBPC-REQ message from the terminal according to the DBPC-REQ message allocation information through an UL-BURST region; And e) a base station changing a downlink interval use code (DIUC) requested by the DBPC-REQ message, generating a DBPC response (DBPC-RSP) message according to the changed DIUC, and transmitting the same to the terminal. . According to the present invention, even when a handover or a wireless environment is poor, communication may be prevented from being disconnected, an initial ranging success rate may be increased, and an already connected traffic connection loss rate may be reduced.

High speed mobile internet system, burst profile, ranging code, CDMA code

Description

How to change the down burst profile of high-speed mobile Internet system {METHOD FOR Downlink BURST PROFILE CHANGING OF HIGH-SPEED POTABLE INTERNET SYSTEM}

1 illustrates a configuration of a high speed portable internet system to which the present invention is applied.
FIG. 2 illustrates in detail the configuration of an access traffic subsystem and an access control subsystem, which are some components of FIG.
3 illustrates a frame structure of a high speed portable internet system to which the present invention is applied.
4 is a flowchart illustrating a method of changing a downward burst profile in a high speed portable Internet system according to an embodiment of the present invention.
FIG. 5 is a flowchart illustrating a process of transmitting reallocated DBPC ranging code information from the base station to the terminal.
FIG. 6 is a flowchart illustrating a CDMA code allocation function performing process of FIG. 5.
FIG. 7 illustrates a code_count_index relationship with currently serving traffic connections required in FIG. 5.
FIG. 8 illustrates the number of CDMA codes using the code_count_index set by FIGS. 5 and 7.
9 is a flowchart illustrating a process of a base station processing a DBPC-REQ message in a method of changing a down burst profile of a high speed portable Internet system according to an embodiment of the present invention.
FIG. 10 illustrates a process of executing the libPcfbToRngbInd function of FIG. 9.

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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for changing a downlink burst profile of a high speed portable internet system. In particular, a downlink burst profile change request (DBPC-REQ) message in a high speed portable internet system is processed at a high speed. The present invention relates to a method of changing a downlink burst profile for allocating a DBPC ranging code to reduce a connection disconnection of a PC.
Orthogonal Frequency-Division Multiplexing (OFDM) communication systems mainly use algorithms that minimize interference between base stations by differently assigning ranging codes used by each base station.
In the OFDM communication system, since the interference increases when the ranging codes are generally used in all base stations, an algorithm for minimizing the interference between the base stations is necessary.
The ranging code allocation algorithm can reduce the interference between base stations by allocating codes used by each base station. However, since the number of codes allocated to each base station itself is reduced, when a plurality of subscribers request access at the same time, There is a problem that the efficiency is poor.
In the existing ranging code allocation algorithm, since a burst profile request message of a mobile terminal connecting with a mobile terminal requesting an initial ranging function is in competition with each other, when a plurality of mobile terminals attempt to connect to a mobile terminal, There is a problem that the downlink burst profile change is not made at the correct time, and thus the connection of the call in service may be disconnected.

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An object of the present invention for solving the above problems is to provide a method for changing the down burst profile of the high-speed portable Internet system that can reduce the traffic disconnection of the mobile terminal currently in service as much as possible and increase the initial ranging success rate. It is to.

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표 1에 나타나 있듯이, 현재 초고속 휴대 인터넷 시스템에서는 레인징을 위한 CDMA 코드로서, 초기 CDMA 코드, 주기 CDMA 코드 및 대역 할당 CDMA 코드를 사용하고 있지만, 본 발명의 실시예에서는 위의 3가지 CDMA 코드 이외에 DBPC 요구 CDMA 코드를 추가로 사용한다.
초기 CDMA 코드는 단말기가 초기 레인징을 요청하는 경우에 사용하고, 주기 CDMA 코드는 단말기가 현재 자신의 상태를 주기적으로 보고할 때 사용하며, 대역 할당 CDMA 코드는 단말기가 상향으로 데이터를 보내기 위해서 기지국의 스케줄러에게 대역 할당을 요구하기 위해 사용한다. 그리고 DBPC 요구 CDMA 코드는 무선 환경의 변화를 신속하게 액세스 포인트(AP)로 보고하기 위해 사용된다.
초고속 휴대 인터넷 시스템의 액세스 포인트(Access Point)는 기존의 광대역 무선 접속(Broadband Wireless Access: BWA) 시스템보다 이동성 기능이 강화되어 무선 채널 환경의 변화에 따라 송수신하는 채널이 버스트하게 변화하므로 무선 채널의 상태를 보고하는 메시지가 추가적으로 필요하다.
이러한 메시지에는 무선 채널의 변화를 이동 단말기가 액세스 포인트에 보고하는 DBPC-REQ 메시지가 있다.
그러나 고속 휴대 인터넷 시스템은 기존의 이동 통신 시스템에서 사용하는 상향 링크를 위한 채널이 따로 존재하지 않는다.
따라서 상향 링크로 메시지를 송신하는 방법에는 해당 단말기가 사용하는 CID(Connection ID)로 상향 트래픽이 존재하는 경우에 트래픽 데이터에 상향 대역 할당 메시지가 연접(Concatenation)되어 송신되는 방법, 또는 상향 트래픽 데이터가 없는 경우에 CDMA 코드를 이용하여 대역 할당을 요구하는 방법이 있다.
그런데, 상향 트래픽 데이터가 존재하지 않는 경우에 사용하는 CDMA 코드를 이용한 대역 할당 방법은 초기 코드 레인징 코드와 같은 코드를 사용하면 레인징 경쟁에서 실패할 수 있고, 이 경우 가입자는 핸드오버가 아니지만 통화 단절 현상을 경험하게 된다.
아래 본 발명의 실시예에 따른 초고속 휴대 인터넷 시스템의 하향 버스트 프로파일 변경 방법에서는 통화중인 이동 가입자가 요구하는 하향 버스트 프로파일 갱신 요구 메시지인 DBPC-REQ 메시지를 기지국이 처리하기 위해서, DBPC 레인징 코드에 별도의 CDMA code(DBPC 요구 CDMA 코드)를 추가로 할당함으로써, 사용자의 호 단절 현상 없이 하향 버스트 프로파일 갱신이 신속히 이루어지게 할 수 있다.
도 4는 본 발명의 실시예에 따른 초고속 휴대 인터넷 시스템에서의 하향 버스트 프로파일 변경 방법의 흐름을 도시한 것이다.
도 4에 도시된 바와 같이, 본 발명의 실시예에 따른 초고속 휴대 인터넷 시스템에서의 하향 버스트 프로파일 변경 방법은, 먼저, 단말기에서 요구하는 DBPC-REQ 기능을 ATS(220)에서 처리하게 되는데, 이때 상기 단말기는 자신의 하향 버스트 프로파일이 변경되어 DBPC-REQ 메시지를 ATS(220)로 송신할 때, 먼저 DBPC 레인징 코드를 이용하여 ATS(220)의 RNGB(221)로 보낸다.
RNGB(221)는 DBPC 레인징 코드를 최우선으로 처리하여 PSCB(223)로 해당 단말기에게 DBPC-REQ 메시지를 위한 UL-MAP 요구 메시지를 송신하여 DBPC-REQ 메시지를 위한 상향 링크 대역 할당을 요구한다.
PSCB(223)는 UL-MAP 요구 메시지를 수신한 후, 다음 프레임의 UL-MAP 정보에 DBPC-REQ 메시지 할당 정보를 넣어 단말기로 송신한다. 이를 통해 DBPC-REQ 할당 정보를 수신한 단말기는 DBPC-REQ 메시지를 UL-BURST 영역을 통하여 메시지 형태로 TRMB(222)로 송신하고, ATS(220)의 TRMB(222)는 해당 단말기의 메시지를 RNGB(221)로 msgDbpcReqInd_id 메시지를 보낸다.
그러면, RNGB(221)는 DBPC-REQ 메시지에서 요청한 하향 인터벌 이용 코드(Downlink Interval Usage Code: DIUC)를 변경하고, DBPC-RSP 메시지를 생성하여 이를 단말기로 송신한다.
도 5는 기지국에서 재할당된 DBPC 레인징 코드 정보를 상기 단말기로 전송하는 과정에 대한 순서도를 도시한 것이고, 도 6은 도 5의 CDMA 코드 할당 함수 수행 과정의 순서도를 도시한 것이다.
도 5에 도시된 바와 같이, 기지국의 ACS(230)에서 현재 수행 중인 트래픽 연결을 가지고 CODE_COUNT_INDEX를 재할당하여 재할당된 CODE_COUNT_INDEX가 변경된 경우에 UCD(Uplink Channel Descriptor)를 통해서 단말기로 변경 메시지를 전송하게 된다.
즉, ACS(230)에서는 ATS(220)로부터 새로운 연결 요구 메시지를 수신하면, 수신된 연결 요구 메시지를 가지고 새로운 연결을 설정한다. 새로운 연결이 설정되면, CDMA 코드 할당 함수(fnCdmaCodeAssign)를 호출하여 수행한다.
이때, 도 6에 도시된 바와 같이, CDMA 코드 재할당을 위해서 MAX_TRAFFIC_INDEX에서 I(traffic index 값)를 뺀 값을 K로 할당하고, 이렇게 할당된 K를 가지고 현재 trafficAtCount가 MAX_TRAFFIC_CON_COUNT/k보다 작은지 큰지를 비교한다.
K를 MAX_TRAFFIC_CON_COUNT와 비교된 값이 참이면 I를 리턴하고, 거짓이면 I를 증가한 후에 다시 K값을 할당하는 과정을 수행한다.
위의 과정에서 결정된 I값이 이전의 코드_카운트_인덱스(OLD_CODE_COUNT_INDEX)와 비교하여, 그 비교 결과가 참이면 새로운 코드_카운트_인덱스(NEW_CODE_COUNT_INDEX)를 가지고 각 코드 개수를 설정하고, PCFB(226)로 UCD 변경 메시지를 보낸다. 그러나 I값이 이전의 코드_카운트_인덱스(OLD_CODE_COUNT_INDEX)와 비교한 결과가 거짓이면 바로 코드 할당 함수의 연산을 종료한다.
도 7은 도 5에서 필요한 현재 서비스 중인 트래픽 연결과 코드_카운트_인덱스 관계를 나타낸 것이고, 도 8은 도 5 및 도 7에 의해 설정된 코드_카운트_인덱스를 이용한 CDMA 코드 개수를 나타난 것이다.
도 7에 나타나 있듯이, 코드_카운트_인덱스는 사용자 수가 적은 경우에 1이고, 사용자 수가 많아짐에 따라 2와 3으로 증가하다가 연결 사용자 수가 최대일 경우에 4로 할당된다.
도 8에 나타나 있듯이, 초고속 휴대 인터넷 시스템에서 사용하는 전체 CDMA CODE 수는 48개이므로 CDMA 코드 개수는 기본적으로 BASIC_CDMA_CODE_COUNT로 할당한 것이 각 종류별로 4로 한다. 이렇게 할당하고 남은 코드 개수를 MAX_ASSIGN_CDMA_CODE_COUNT(MACCC)로 할당하고, 계산된 MACCC와 CODE_COUNT_INDEX를 가지고 각 부분에서 필요한 코드 개수(CODE COUNT)를 계산한다.
도 9는 본 발명의 실시예에 따른 초고속 휴대 인터넷 시스템의 하향 버스트 프로파일 변경 방법에서 기지국이 DBPC-REQ 메시지를 처리하는 과정에 대한 순서도를 도시한 것이다.
도 9를 참조하면, 기지국의 ATS(220) 내 RNGB(221)에서 TRMB(222)를 통해서 DBPC-REQ 메시지를 수신하면, ATS(220) 내 해당 단말기의 DIUC를 찾아내고, 이 DIUC를 현재 DIUC(currentDiuc)로 저장하고(S21), DBPC-REQ 메시지의 DIUC를 찾아서 신규 DIUC(newDiuc)로 저장한다(S22).
다음으로, currentDiuc 및 newDiuc 값에 각각 대응하는 현재 코드 할당 함수(currentFCT) 및 신규 코드 할당 함수(newFCT)를 버스트 프로파일 정보로부터 찾아낸다(S23). 상기 NewFCT와 currentFCT 값을 비교하여(S24), currentFCT가 값이 더 큰 경우, 버스트 타입이 초과 버스트(MORE_BURST)라고 판단하고, 이에 따라 상기 DBPC-REQ 메시지에서 수신한 DIUC를 PCFB(226) 내의 단말기 정보 필드에 저장한 후에 DBPC-RSP 메시지를 생성한다(S25).
이렇게 생성된 DBPC-RSP MAC 메시지를 rngbId(RNGB Information ID)를 -1로 하여 PCFB(226)로 전송하여 단말기로 DBPC-RSP MAC 메시지가 전송되도록 한다(S26).
그런데, 현재 코드 할당 함수(currentFCT) 및 신규 코드 할당 함수(newFCT) 값을 비교하여 currentFCT가 값이 더 작은 경우, 미만 버스트(LESS_BURST_TYPE)라고 판단하고, 이에 따라 DBPC 정보를 rngbInfo_type에 저장한 후, 메시지를 생성하여 해당 rngbId를 가지고 PCFB(226)로 전송한다(S27).
다음으로, PCFB(226)는 DBPC_RSP 메시지를 생성하여(S28) 단말기로 송신하고(S29), 이때 트래픽의 DIUC를 변경하기 위해 libPcfbToRngbInd 함수를 호출하게 된다. 도 10은 도 9의 libPcfbToRngbInd 함수 수행 과정을 구체적으로 도시한 것이다.
이와 같이, 본 발명의 실시예에서는 초고속 휴대 인터넷 시스템에서 사용하는 CDMA 코드들을 모든 경우에 동일하게 사용하는 것이 아니라 현재 서비스 중인 단말기가 하향 버스트 프로파일 변경 요청시 기지국은 현재 수행 중인 트래픽 연결에 따라 요청 메시지를 가변적으로 처리하도록 DBPC 레인징 코드를 재할당함으로써, 현재 서비스 중인 이동 단말기의 트래픽이 단절되는 현상이 최대한 감소되도록 한다.
그리고 본 발명의 실시예에서는 단말기가 상향 링크 상에서 얼마의 시간동안 비활성화되고, 하향 링크 상에서 페이딩을 감지한 경우, 기지국이 현재 무선 채널에 가장 적합한 DIUC를 찾아서 DBPC-REQ 메시지를 송신하기 위해 DBPC 레인징 코드로 대역 할당을 요청하고, 초기 레인징이나 트래픽의 대역 할당 요구 메시지와 경쟁하여 DBPC-REQ 메시지 전송 실패시 호가 단절되는 상황을 극복할 수 있도록 한다.
그런데, 초고속 휴대 인터넷 시스템에서 사용 가능한 CDMA 코드의 개수 48로 한정되어 있기 때문에 DBPC 레인징 코드를 고정된 개수로 나눌 경우, 이때 셀 초기화시 트래픽 연결이 없으면 DBPC 레인징 코드가 충돌되어 실패할 확률이 높다.
따라서 본 발명의 실시예에서는 기지국의 트래픽 연결 수에 따라 CDMA 코드를 능동적으로 재할당하여 기존의 고정된 CDMA 코드 카운트를 사용할 때보다 셀 초기화시나 트래픽 연결이 적은 경우에 초기 레인징을 좀 더 효율적으로 할 수 있고, 트래픽 연결 사용자가 많은 경우에 버스트 프로파일 CDMA 코드를 다른 경우에 비해 더 많이 배정하여 버스트 프로파일 변경을 신속하게 수행할 수 있다.
이상에서 본 발명의 바람직한 실시예에 대하여 상세하게 설명하였지만 본 발명은 이에 한정되는 것은 아니며, 그 외의 다양한 변경이나 변형이 가능하다. In order to solve this problem, the present invention provides a DBPC-REQ message requesting to change a downlink burst profile from a currently serving terminal, and the base station reassigns the DBPC ranging code to process the DBPC-REQ message. According to the burst type of the REQ message, the DBPC_RSP message is transmitted to the terminal before the Downlink Interval Usage Code (DIUC) is changed, and the burst is efficiently managed by managing the CDMA code.
According to the present invention, a method of changing a downlink burst profile of a high-speed portable Internet system includes changing a downlink burst profile of a high-speed portable Internet system for managing resources and processing traffic between a base station and a terminal in a high-speed portable Internet system. A method comprising: a) receiving a DBPC ranging code from a mobile subscriber station in a call by the base station; b) using the received DBPC ranging code, the base station reallocates the code_count_index corresponding to the traffic connection currently being performed, and if the reallocated code_count_index is changed, the corresponding code Reallocating the CDMA code by changing the number CODE_COUNT; c) transmitting the reassigned CDMA code information to UL-MAP information in a Downlink Burst Profile Change-Request (DBPC-REQ) message allocation information to the terminal; d) receiving a processed DBPC-REQ message from the terminal according to the DBPC-REQ message allocation information through an UL-BURST region; And e) the base station changes a Downlink Interval Usage Code (DIUC) requested by the DBPC-REQ message, generates a DBPC-RSP message according to the changed DIUC, and sends it to the terminal. Transmitting.
Here, in step e), the base station finds the DIUC of the corresponding terminal, stores the current DIUC (currentDiuc), finds the DIUC of the received DBPC-REQ message, and stores the DIUC as a new DIUC (newDiuc). step; e-2) finding from the burst profile information a current code allocation function (currentFCT) and a new code allocation function (newFCT) corresponding to the current DIUC (currentDiuc) and the new DIUC (newDiuc) values, respectively; e-3) comparing the NewFCT and the currentFCT values and determining that the burst type is an excess burst (MORE_BURST) when the currentFCT is larger; And e-4) comparing the NewFCT and currentFCT values, and determining that the burst type is less than a burst (LESS_BURST_TYPE) when the currentFCT is smaller.
In this case, when the burst type determined in step e-3 is less than a burst, the DBPC information of the DBPC-REQ message is stored, and a DBPC-RSP message is generated to generate a packet classification and connection ID mapping function. Transmitting to a packet classification block to perform; And the packet classification block may transmit the DBPC-RSP message to the terminal and call the radio link control function to change a new Downlink Interval Usage Code (DIUC) of the corresponding traffic. have.
Here, when the burst type determined in step e-4) is an excess burst, a Downlink Interval Usage Code (DIUC) received from the DBPC information of the DBPC-REQ message is stored in the terminal information field and DBPC- Generating an RSP message; And transmitting the DBPC-RSP message generated in the step to a packet classification block which performs a packet classification and connection ID mapping function, and the packet classification block transmitting the DBPC-RSP message to the terminal. can do.
Here, in step b), the DBPC ranging code is actively allocated according to the number of traffic connections of the base station, when the cell initialization or the number of traffic connections is small, initial ranging processing is performed, and the traffic is performed. If the number of connections is large, the number of DBPC ranging codes can be increased.
Here, the DBPC ranging code of step a) includes an initial CDMA code used when the terminal requests initial ranging; A periodic CDMA code used when the terminal periodically reports its current status; A band allocation CDMA code used when the terminal requests a band allocation from the base station to transmit data upward; And a DBPC request CDMA code used by the terminal to report a change in radio channel environment to the base station.
DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.
In the high-speed portable Internet system to which the present invention is applied, the structure of the MAC software module of the base station is as follows.
In the high-speed portable Internet system to which the present invention is applied, the structure of the MAC software module of the base station is as follows.
FIG. 1 illustrates a configuration of a high speed portable Internet system to which the present invention is applied, and FIG. 2 illustrates in detail a configuration of an access traffic subsystem and an access control subsystem, which are some components of FIG. 1.
As shown in FIG. 1, a high-speed portable Internet system includes an access terminal (AT) 100, an access point (AP) 200 performing a base station function, a packet access routing function, and a mobile IP. It includes a packet access router (PAR) 300 that performs the external agent function of the.
In particular, the access point 200 includes a baseband subsystem 210, an access traffic subsystem 220, an access controller subsystem 230, and an ethernet switch 240. do.
The BBS 210 performs a wireless section transmission and reception function. The ATS 220 performs traffic processing and a radio link transmission / reception control function with the subsystem. In particular, the ATS 220 processes traffic between the ACS 230, the base station, and the terminal.
The ACS 230 performs user management and cell management. The ACS 230 manages resources of each AT 100 and is responsible for a control function of a base station.
2, the software structure of the ATS 220 and ACS 230 to which the present invention is applied will be described in detail as follows.
First, the ATS 220 receives a ranging control block (RNGB), which is a radio link control block, and a downlink burst profile change-request (DBPC-REQ) message to call a function of the RNGB 221 for DBPC-REQ processing. TRMB (Traffic Management Block) 222, PSCB (Packet Scheduling Block: 223), which is a scheduling block, DSP Interface Control Block (DICB) 224, which manages the interface with the DSP, and MAC PDU (Packet Data Unit) to be transmitted over the radio section. Packet Handling Block (PHDB), which is a block constituting a block, Automatic Repeat Request Block (ARQB) to control retransmission, and PCFB which performs packet classification function and connection ID (CID) mapping function of received packet as main functions (Packet Classification Block: 227).
Next, the ACS 230 includes a Packet Handover Control Block (PHCB), a Packet Access Control Block (PACB), a System Information Broadcasting Block (SIBB), and an AP Common Control Block (ACCB).
3 illustrates a frame structure of a high speed portable internet system to which the present invention is applied.
In a frame structure of a high-speed mobile Internet system, a DL preamble (DL preamble) indicates the start of a frame, and a system information channel (System Information Channel) is a system information down, DL-MAP / UL (Uplink)- The MAP informs the terminal of the location of the traffic and message information for the uplink / downlink.
In the frame of the high-speed portable Internet system, the DL burst region is a portion where actual data is transmitted, and the UL burst region is a portion where uplink data is transmitted from the terminal to the AP. Is a downlink burst region and a CDMA code, which is accessed by the terminal.
In this case, the DBPC ranging code divides the CDMA code area that carries the ranging information in the frame of the high-speed portable Internet system into three types (the initial CDMA code, the periodic CDMA code, and the band allocation CDMA code). In the example, a DBPC dedicated code (DBPC request CDMA code) dedicated to DBPC-REQ that actively changes the burst profile of the traffic performed due to the radio characteristics is additionally allocated.
Table 1 below is a DBPC ranging code, and statically represents the code type, code range, and code number set through the CDMA code allocation process.

As shown in Table 1, in the present high-speed portable Internet system, as the CDMA code for ranging, an initial CDMA code, a periodic CDMA code, and a band allocation CDMA code are used, but in the embodiment of the present invention, in addition to the above three CDMA codes, Use additional DBPC request CDMA code.
The initial CDMA code is used when the terminal requests initial ranging, and the periodic CDMA code is used when the terminal periodically reports its current status, and the band allocation CDMA code is used by the base station to send data upward. Used to request the band's allocation from the scheduler. The DBPC request CDMA code is then used to quickly report changes in the wireless environment to the access point (AP).
The access point of the high-speed portable Internet system has enhanced mobility than the existing broadband wireless access (BWA) system, and the state of the wireless channel is changed as the channels to be transmitted and received are bursted according to the change of the wireless channel environment. You need an additional message to report.
This message includes a DBPC-REQ message that the mobile terminal reports to the access point of a change in the wireless channel.
However, the high speed portable Internet system does not have a separate channel for uplink used in the existing mobile communication system.
Therefore, the method for transmitting a message on the uplink includes a method in which an uplink allocation message is concatenated with the traffic data when the uplink traffic exists in a connection ID (CID) used by the corresponding terminal, or the uplink traffic data is transmitted. If no, there is a method for requesting band allocation using a CDMA code.
However, a band allocation method using a CDMA code used when there is no upstream traffic data may fail in a ranging race when a code such as an initial code ranging code is used. In this case, the subscriber is not a handover but a call. You will experience disconnection.
In the method of changing a downlink burst profile of a high-speed portable Internet system according to an embodiment of the present invention, in order to process a DBPC-REQ message, which is a downlink burst profile update request message requested by a mobile subscriber in a call, the base station separates the DBPC ranging code. By additionally assigning the CDMA code (DBPC required CDMA code), the downlink burst profile update can be performed quickly without the user disconnection.
4 is a flowchart illustrating a method of changing a downward burst profile in a high speed portable Internet system according to an embodiment of the present invention.
As shown in FIG. 4, in the method of changing a downlink burst profile in a high-speed portable Internet system according to an embodiment of the present invention, first, a DBPC-REQ function required by a terminal is processed in the ATS 220. When the terminal changes its downlink burst profile and transmits a DBPC-REQ message to the ATS 220, the terminal first sends a DBPC ranging code to the RNGB 221 of the ATS 220.
The RNGB 221 processes the DBPC ranging code as a priority and transmits an UL-MAP request message for the DBPC-REQ message to the corresponding terminal to the PSCB 223 to request uplink bandwidth allocation for the DBPC-REQ message.
After receiving the UL-MAP request message, the PSCB 223 transmits DBPC-REQ message allocation information to the UL-MAP information of the next frame to the terminal. Through this, the terminal receiving the DBPC-REQ allocation information transmits the DBPC-REQ message to the TRMB 222 in the form of a message through the UL-BURST region, and the TRMB 222 of the ATS 220 RNGB the message of the corresponding terminal. Send a msgDbpcReqInd_id message to (221).
Then, the RNGB 221 changes the Downlink Interval Usage Code (DIUC) requested in the DBPC-REQ message, generates a DBPC-RSP message and transmits it to the terminal.
FIG. 5 is a flowchart illustrating a process of transmitting reallocated DBPC ranging code information to the terminal, and FIG. 6 is a flowchart of a process of performing a CDMA code allocation function of FIG. 5.
As shown in FIG. 5, when the reallocated CODE_COUNT_INDEX is changed by reassigning CODE_COUNT_INDEX with the traffic connection currently being performed by the ACS 230 of the base station, a change message is transmitted to the terminal through the uplink channel descriptor (UCD). do.
That is, when the ACS 230 receives a new connection request message from the ATS 220, the ACS 230 establishes a new connection with the received connection request message. When a new connection is established, the CDMA code allocation function (fnCdmaCodeAssign) is called to perform.
In this case, as shown in FIG. 6, a value obtained by subtracting I (traffic index value) from MAX_TRAFFIC_INDEX is allocated as K for CDMA code reallocation, and whether the current trafficAtCount is less than or equal to MAX_TRAFFIC_CON_COUNT / k with this allocated K. Compare.
If K is compared with MAX_TRAFFIC_CON_COUNT, if the value is true, I is returned. If false, I is increased and I is assigned again.
The I value determined in the above process is compared with the previous code_count_index (OLD_CODE_COUNT_INDEX), and if the comparison result is true, each code number is set with the new code_count_index (NEW_CODE_COUNT_INDEX), and PCFB (226) Send UCD change message to. However, if the value of I is compared with the previous code_count_index (OLD_CODE_COUNT_INDEX) and the result is false, the operation of the code allocation function is terminated immediately.
FIG. 7 illustrates the currently-connected traffic connection and code_count_index relationship required in FIG. 5, and FIG. 8 illustrates the number of CDMA codes using the code_count_index set by FIGS. 5 and 7.
As shown in FIG. 7, the code_count_index is 1 when the number of users is small, and increases to 2 and 3 as the number of users increases, and is assigned to 4 when the number of connected users is maximum.
As shown in FIG. 8, since the total number of CDMA codes used in the high-speed portable Internet system is 48, the number of CDMA codes is basically assigned to BASIC_CDMA_CODE_COUNT as 4 for each type. The remaining number of codes is allocated as MAX_ASSIGN_CDMA_CODE_COUNT (MACCC), and the required code count in each part is calculated using the calculated MACCC and CODE_COUNT_INDEX.
9 is a flowchart illustrating a process of a base station processing a DBPC-REQ message in a method of changing a down burst profile of a high speed portable Internet system according to an embodiment of the present invention.
Referring to FIG. 9, when the RNGB 221 in the ATS 220 of the base station receives the DBPC-REQ message through the TRMB 222, the DIUC of the corresponding terminal in the ATS 220 is found and the current DIUC is used. Save as (currentDiuc) (S21), find the DIUC of the DBPC-REQ message and store it as a new DIUC (newDiuc) (S22).
Next, the current code assignment function currentFCT and the new code assignment function newFCT corresponding to the values of currentDiuc and newDiuc are found from the burst profile information (S23). Comparing the NewFCT and the currentFCT values (S24), if the currentFCT is larger, it is determined that the burst type is an excess burst (MORE_BURST), and accordingly the DIUC received in the DBPC-REQ message is the terminal in the PCFB 226. After storing in the information field generates a DBPC-RSP message (S25).
The generated DBPC-RSP MAC message is transmitted to the PCFB 226 with rngbId (RNGB Information ID) -1 so that the DBPC-RSP MAC message is transmitted to the terminal (S26).
However, when the currentFCT is smaller by comparing the values of the current code allocation function (currentFCT) and the new code allocation function (newFCT), it is determined to be a less than burst (LESS_BURST_TYPE), and accordingly stores DBPC information in rngbInfo_type, and then the message Generate and transmit to the PCFB 226 with the corresponding rngbId (S27).
Next, the PCFB 226 generates a DBPC_RSP message (S28) and sends it to the terminal (S29). At this time, the libPcfbToRngbInd function is called to change the DIUC of the traffic. FIG. 10 illustrates a process of executing the libPcfbToRngbInd function of FIG. 9 in detail.
As described above, according to the embodiment of the present invention, the CDMA codes used in the high-speed portable Internet system are not used identically in all cases, but when the terminal currently in service requests a downlink burst profile change, the base station requests a message according to the traffic connection currently being performed. By reassigning the DBPC ranging code to variably handle, the traffic disconnection of the currently serving mobile terminal is reduced as much as possible.
In the embodiment of the present invention, when the terminal is deactivated for some time on the uplink and detects fading on the downlink, the base station finds the most suitable DIUC for the current radio channel and sends the DBPC-REQ message to the DBPC-REQ message. Code allocation is requested by the code, and competition with the bandwidth allocation request message of initial ranging or traffic can overcome the situation of call disconnection when DBPC-REQ message transmission fails.
However, since the number of CDMA codes available in the high-speed portable Internet system is limited to 48, if the DBPC ranging codes are divided into fixed numbers, there is a possibility that the DBPC ranging codes will collide and fail if there is no traffic connection during cell initialization. high.
Therefore, in the embodiment of the present invention, by actively reallocating the CDMA code according to the number of traffic connections of the base station, the initial ranging is more efficiently performed when the cell is initialized or when there are fewer traffic connections than when using a fixed CDMA code count. In the case of a large number of traffic-connected users, more burst profile CDMA codes can be assigned than in other cases to quickly perform burst profile changes.
Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

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As described above, according to the present invention, in the high-speed portable Internet system, the base station can efficiently use the DBPC-REQ message used when the terminal is somewhat deactivated on the uplink and detects fading on the downlink. By assigning the code code to perform uplink band allocation, and also by the base station performs the DIUC change operation requested by the mobile terminal, it is possible to prevent the communication is disconnected even in a situation where the handover or wireless environment is poor, the initial ranging It also increases the success rate and can reduce the loss of already connected traffic connections.

Claims (6)

In a high speed portable Internet system, a downlink burst profile change (DBPC) method of a high speed portable internet system for managing resources and processing traffic between a base station and a terminal, a) the base station receiving a DBPC ranging code from a mobile subscriber station in a call; b) using the received DBPC ranging code, the base station reallocates the code_count_index corresponding to the traffic connection currently being performed, and if the reallocated code_count_index is changed, the corresponding code Reallocating the CDMA code by changing the number CODE_COUNT; c) transmitting the reassigned CDMA code information to UL-MAP information as a DBPC request (DBPC-REQ) message allocation information to the terminal; d) receiving a processed DBPC-REQ message from the terminal according to the DBPC-REQ message allocation information through an UL-BURST region; And e) the base station changes a Downlink Inverval Usage Code (DIUC) requested by the DBPC-REQ message, generates a DBPC-RSP message according to the changed DIUC, and transmits it to the terminal. Steps to How to change the down burst profile of a high-speed mobile Internet system comprising a. The method of claim 1, wherein step e) e-1) finding, by the base station, a DIUC of the corresponding terminal and storing the current DIUC as a current DIUC, finding a DIUC of the received DBPC-REQ message, and storing the DIUC as a new DIUC; e-2) finding from the burst profile information a current code allocation function (currentFCT) and a new code allocation function (newFCT) corresponding to the current DIUC (currentDiuc) and the new DIUC (newDiuc) values, respectively; e-3) comparing the NewFCT and the currentFCT values and determining that the burst type is an excess burst (MORE_BURST) when the currentFCT is larger; And e-4) comparing the NewFCT and currentFCT values and determining that the burst type is less than burst (LESS_BURST_TYPE) when the currentFCT is smaller. How to change the down burst profile of a high-speed mobile Internet system comprising a. The method of claim 2, When the burst type determined in step e-3 is less than burst, storing DBPC information of the DBPC-REQ message, generating a DBPC-RSP message, and performing packet classification and connection ID mapping function. Transmitting to a packet classification block; And The packet classification block transmits the DBPC-RSP message to the terminal, and calls the radio link control function to change a new downlink interval usage code (DIUC) of the corresponding traffic. How to change the down burst profile of a high-speed mobile Internet system comprising a. The method of claim 2, If the burst type determined in step e-4 is an excess burst, a Downlink Interval Usage Code (DIUC) received from the DBPC information of the DBPC-REQ message is stored in the terminal information field and the DBPC-RSP message is stored. Generating a; And Transmitting the DBPC-RSP message generated in the step to a packet classification block that performs packet classification and connection ID mapping, and the packet classification block transmits the DBPC-RSP message to the terminal. How to change the down burst profile of a high-speed mobile Internet system comprising a. The method of claim 1, wherein b), DBPC ranging code is actively allocated according to the number of traffic connections of the base station, and initial ranging processing is performed when cell initialization or the number of traffic connections is small, and when the number of traffic connections is large, the DBPC A method of changing the down burst profile of a high speed mobile internet system, characterized by increasing the number of ranging codes. The method of claim 1, wherein the DBPC ranging code of step a), An initial CDMA code used when the terminal requests initial ranging; A periodic CDMA code used when the terminal periodically reports its current status; A band allocation CDMA code used when the terminal requests a band allocation from the base station to transmit data upward; And DBPC request CDMA code used for the terminal to report a change in radio channel environment to the base station How to change the down burst profile of a high-speed mobile Internet system comprising a.

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