KR960027488A - Traffic Channel Allocation Method in Code Division Multiple Access Cellular System - Google Patents

Traffic Channel Allocation Method in Code Division Multiple Access Cellular System Download PDF

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KR960027488A
KR960027488A KR1019940034387A KR19940034387A KR960027488A KR 960027488 A KR960027488 A KR 960027488A KR 1019940034387 A KR1019940034387 A KR 1019940034387A KR 19940034387 A KR19940034387 A KR 19940034387A KR 960027488 A KR960027488 A KR 960027488A
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call
power
initial
handoff
channel
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KR1019940034387A
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Korean (ko)
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KR970008171B1 (en
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김명진
정종태
이헌
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양승택
재단법인 한국전자통신연구소
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies

Abstract

본 발명은 코드분할다중접속 셀룰라 시스템에서의 트래픽 채널 할당 방식에 관한 것으로 특히, 소프터 핸드오프 호, 소프트 핸드오프 호, 하드 핸드오프 호, 및 새로운 호로의 호 분류에 따른 트래픽 채널 할당 방법에 관한 것이다.The present invention relates to a traffic channel allocation method in a code division multiple access cellular system, and more particularly, to a traffic channel allocation method according to call classification into softer handoff calls, soft handoff calls, hard handoff calls, and new calls. will be.

본 발명은 호가 발생하면 호의 종류를 소프터 핸드오프 호, 소프트 핸드오프 호, 하드 핸드오프 호 및 새로운 호로 분류하고 호의 종류 및 상황에 따라 우선순위를 부여하는 과정; 및 상기 발생한 호에 대하여 가용한 자원의 정도를 조사하고, 가용한 자원이 있는 경우 트래픽 채널을 할당하는 과정으로 수행되는 것을 특징으로 하여, CDMA 주파수 하드 핸드오프의 빈도를 줄일 수 있는 효과가 있다.The present invention provides a method of classifying a call as a softener handoff call, a soft handoff call, a hard handoff call, and a new call when a call is generated, and giving priority to the call type and situation; And checking the degree of available resources for the generated call, and allocating a traffic channel when there are available resources, thereby reducing the frequency of CDMA frequency hard handoff.

Description

코드분할다중접속 셀룰라 시스템에서의 트래픽 채널 할당 방법Traffic Channel Allocation Method in Code Division Multiple Access Cellular System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제 1 도는 호 분류에 따른 채널 할당 방법을 설명하는 설명도, 제 2 도는 소프트 핸드오프 호 채널 할당 방법을 설명하는 흐름도, 제 3 도는 소프트 핸드오프 호 채널 할당 방법을 설명하는 흐름도, 제 4 도는 하드 핸드오프 호 채널 할당 방법을 설명하는 흐름도, 제 5 도는 새로운 호 채널 할당 방법을 설명하는 흐름도.1 is an explanatory diagram illustrating a channel allocation method according to call classification, FIG. 2 is a flowchart illustrating a soft handoff call channel allocation method, FIG. 3 is a flowchart illustrating a soft handoff call channel allocation method, and FIG. 4 is a hard diagram Flow diagram illustrating a handoff call channel allocation method, and FIG. 5 illustrates a flow chart illustrating a new call channel allocation method.

Claims (7)

CDMA 셀룰라 시스템에서의 트래픽 채널 할당 방식에 있어서, 호가 발생하면 호의 종류를 소프터 핸드오프 호, 소프트 핸드오프 호, 하드 핸드오프 호 및 새로운 호로 종류하고 호의 종류 및 상황에 따라 우선 순위를 부여하는 과정 ; 및 상기발생한 호에 대하여 가용한 자원의 정도를 조사하고, 가용한 자원이 있는 경우 트래픽 채널을 할당하는 과정으로 수행되는 것을 특징으로 하는 트래픽 채널 할당 방식.In the traffic channel allocation scheme in a CDMA cellular system, when a call occurs, a call is classified into a soft handoff call, a soft handoff call, a hard handoff call, and a new call, and the priority is given according to the type and situation of the call. ; And checking the degree of available resources for the generated call, and allocating a traffic channel if there are available resources. 제 1 항에 있어서, 상기 소프터 핸드오프 호의 경우에는 잔여 전력량이 소정의 임계치(이하, R_Power) 이상이면 그 호에 초기 전력을 할당하고 사용되지 않는 왈쉬 채널을 할당하며, 잔여 전력량을 초기 전력량 만큼 감소시키는 과정(201,204∼206) 및 잔여 전력량이 R_Power 보다 작으면 T_COMP 핸드오프인 경우에만 잔여 전력량이 초기할당 전력 이상인 경우에 한해 그 호에 초기 전력을 할당하고 사용되지 않는 왈쉬 채널을 할당하며 잔여 전력량을 초기 전력량 만큼 감소시키고,T_COMP 핸드오프가 아니거나 잔여 전력량이 초기할당 전력보다 작으면 상기 할당을 거부하는 과정(201∼206,207)으로 수행되는 것을 특징으로 하는 트래픽 채널 할당 방식.The method of claim 1, wherein, in the case of the softener handoff call, if the remaining power amount is greater than or equal to a predetermined threshold (hereinafter, R_Power), the initial power is allocated to the call and an unused Walsh channel is allocated. Reduction process (201,204 ~ 206) and the remaining power amount less than R_Power, the initial power is allocated to the call only if the remaining power amount is more than the initial allocation power only in the T_COMP handoff, and the unused Walsh channel and the remaining power amount Decreases the initial power by the amount of initial power and rejects the allocation if the remaining power is not T_COMP or the remaining power is smaller than the initial allocation power (201 to 206, 207). 제 1 항에 있어서, 상기 소프트 핸드오프 호의 경우에는 소프트 핸드오프를 위해 요청한 CDMA 주파수에해당하는 채널 엘리먼트(이하, CE)의 남은 갯수가 T_COMP를 위해 유보된 소정의 갯수(이하, k) 이상이면상기 소프터 핸드오프와 같은 방법으로 그 호에 초기 전력을 할당하고 사용되지 않는 왈쉬 채널을 할당 하며 잔여 전력량을 초기 전력량 만큼 감소시키는과정(301,304∼308), CE의 남은 갯수가 k 미만인 경우에는 T_COMP 핸드오프에 한해 채널 엘리먼트를 모두 사용하고 있는지를 조사하여 전부 사용하고 있지 않으면 그 호에 초기 전력을 할당하고 사용되지 않는 왈쉬 채널을 할당하며, 잔여 전력량을 초기 전력량 만큼 감소시키는 과정(301∼303,304∼308) 및 상기 과정에서 초기 전력과 왈쉬 채널이 할당된 호에 대해서 트렁크, 채널 엘리먼트 그룹(이하, CEG) 및 CE를 할당하는 과정(309∼312)으로 수행되는 것을 특징으로 하는 트래픽 채널 할당 방식.The method of claim 1, wherein in the case of the soft handoff call, the remaining number of channel elements (hereinafter, CE) corresponding to the CDMA frequency requested for soft handoff is equal to or greater than a predetermined number (hereinafter, k) reserved for T_COMP. The initial power is allocated to the call, the Walsh channel is not used, and the remaining power is reduced by the initial power in the same manner as the softer handoff (301,304-308). If the remaining number of CE is less than k, T_COMP Investigate whether all channel elements are being used only for handoff, and if not, allocate initial power to the call, assign an unused Walsh channel, and reduce the remaining power by the initial power (301 ~ 303, 304 ~). 308) trunk, channel element group (hereafter CEG) and CE for calls to which initial power and Walsh channels are assigned Traffic channel assignment scheme, characterized in that the process is carried out (309-312) for assigning. 제 1 항에 있어서, 상기 하드 핸드오프 호의 경우에는 인접 기지국들에서 지원하는 CDMA 주파수중에서 가장 적은 호를 처리하는 CDMA 주파수를 선택하는 과정(401) ; 선택된 CDMA 주파수의 채널 엘리먼트가 전부 사용중이 아니고, 잔여 전력이초기할당 전력 이상이면 그 호에 초기 전력을 할당하고 사용되지 않는 왈쉬 채널을 할당하며, 잔여 전력량을 초기 전력량 만큼 감소시키는 과정(402∼405); 및 상기 과정에서 초기 전력과 왈쉬 채널이 할당된 호에 대해서 CEG 및 CE를 할당하는 과정(406∼408)으로 수행되는 것을 특징으로 하는 트래픽 채널 할당 방식.2. The method of claim 1, further comprising: selecting a CDMA frequency for processing the smallest call among CDMA frequencies supported by neighbor base stations in case of the hard handoff call (401); If all the channel elements of the selected CDMA frequency are not in use and the remaining power is greater than the initial allocated power, assigning initial power to the call, assigning an unused Walsh channel, and reducing the remaining power by the initial power amount (402 to 405). ); And assigning CEG and CE to the call to which the initial power and Walsh channel are allocated in the process (406 to 408). 제 1 항에 있어서, 상기 새로운 호의 경우에는 새로운 호가 발생한 경우에는 인접 기지국과 공통으로 사용하는 주파수중에서 배정된 CE들이 가장 적은 주파수를 우선적으로 선택하여, 선택하려고 하는 주파수에 배정된 CE중 사용 안하는 CE 갯수가 소정의 갯수(이하, m) 이상이면 그 주파수 선정을 허용하고, 사용 안하는 CE 갯수가 m 미만인 경우에는 기지국에서부터 이동국이 떨어진 거리(Round Trip Delay : 이하 RTD)를 보고 이동국이 멀리 있는 경우 즉, RTD가 소정의 임계치(이하, THR)보다 큰 경우에만 그 주파수를 허용하고, RTD가 THR 이하이면 현 기지국만 사용하는 주파수중에서 제일 적게 사용하고 있는 주파수를 선정하는 과정(501∼504) ; 선정된 주파수의 가용한 CE 갯수가 k 미만인 경우에는 채널 할당에 실패하고, k 이상인 경우에는 잔여 전력이 R_Power 이상인 경우에만 초기 전력, 왈쉬 채널, 프레임 옵셋, 트렁크, CEG 및 CE를 할당하는 과정(505∼512)으로 수행되는 것을 특징으로 하는 트래픽 채널 할당 방식.The method of claim 1, wherein, in the case of the new call, when the new call is generated, the CEs assigned among the frequencies commonly used with the neighboring base station preferentially select the least one, and the unused CE among the CEs assigned to the frequency to be selected. If the number is more than the predetermined number (m), the frequency selection is allowed. If the unused number of CE is less than m, the mobile station is far from the base station based on the distance from the base station (Round Trip Delay: RTD). When the RTD is larger than a predetermined threshold (hereinafter, referred to as THR), allowing the frequency, and if the RTD is equal to or less than THR, selecting a frequency which is the least used among frequencies used only by the current base station (501 to 504); If the number of available CEs of the selected frequency is less than k, the channel allocation fails, and if more than k, initial power, Walsh channel, frame offset, trunk, CEG, and CE are allocated only when the remaining power is greater than R_Power (505). 512). 제 1 항에 있어서, 각 CEG에서 선택된 프레임 옵셋과 인접한 프레임 옵셋의 사용 상태를 검색하여 그 합이 가장 적은 CEG를 선택하는 것을 특징으로 하는 트래픽 채널 할당 방식.The traffic channel allocation method of claim 1, wherein the CEG having the smallest sum is selected by searching for the use state of the frame offset adjacent to the selected frame offset in each CEG. 제 1 항에 있어서, 전체 전력 관리는 섹터 경계 지역을 넘어가는 핸드오프 호에게 새로운 호보다 우선순위를 주도록 핸드오프 호를 위한 전력을 여분으로 남겨두는 것을 특징으로 하는 트래픽 채널 할당 방식.2. The method of claim 1 wherein overall power management leaves extra power for the handoff call to give priority to the new call to the handoff call crossing the sector boundary region. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940034387A 1994-12-15 1994-12-15 Traffic channel assignment method in cdma cellular system KR970008171B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100240451B1 (en) * 1997-05-22 2000-01-15 서평원 Reducing method of continuing hard handoff between base stations
KR100330809B1 (en) * 1998-11-09 2002-04-01 윤종용 Apparatus and wirless network and method for reallocating a traffic channel in soft handoff state
KR100711164B1 (en) * 2001-12-20 2007-04-24 엘지노텔 주식회사 Method for frequency resource assignment of mobile communication system
US7260074B2 (en) 2002-12-31 2007-08-21 Nokia Corporation Handover decision for IP services broadcasted on a DVB network

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100240451B1 (en) * 1997-05-22 2000-01-15 서평원 Reducing method of continuing hard handoff between base stations
KR100330809B1 (en) * 1998-11-09 2002-04-01 윤종용 Apparatus and wirless network and method for reallocating a traffic channel in soft handoff state
KR100711164B1 (en) * 2001-12-20 2007-04-24 엘지노텔 주식회사 Method for frequency resource assignment of mobile communication system
US7260074B2 (en) 2002-12-31 2007-08-21 Nokia Corporation Handover decision for IP services broadcasted on a DVB network

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