WO2005064953A1 - Transfert sans coupure dans un systeme amcr - Google Patents

Transfert sans coupure dans un systeme amcr Download PDF

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Publication number
WO2005064953A1
WO2005064953A1 PCT/CN2004/001278 CN2004001278W WO2005064953A1 WO 2005064953 A1 WO2005064953 A1 WO 2005064953A1 CN 2004001278 W CN2004001278 W CN 2004001278W WO 2005064953 A1 WO2005064953 A1 WO 2005064953A1
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WO
WIPO (PCT)
Prior art keywords
pilot
mobile station
base station
soft handover
threshold
Prior art date
Application number
PCT/CN2004/001278
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English (en)
Chinese (zh)
Inventor
Yalei Cui
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2005064953A1 publication Critical patent/WO2005064953A1/fr

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Classifications

    • 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
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment

Definitions

  • the present invention relates to code division multiple access (CDMA) technology, and in particular, to a soft handover method for a CDMA system.
  • CDMA code division multiple access
  • the mobile station when the mobile station starts to contact the new base station, it does not immediately interrupt the communication with the original base station, but first establishes communication with the new base station until it receives a lower than the original base station. When the threshold signal is reached, the communication with the original base station is cut off. Because this process is first turned on and then off, this switching method is called soft switching.
  • the mobile station decides whether to perform handover according to the pilot strength of each base station.
  • the pilot is a pilot signal, also called a pilot channel.
  • the mobile station continuously scans the pilot. When the pilot strength of a base station exceeds a certain threshold, the mobile station establishes communication with the base station. Similarly, when the pilot strength of a certain base station falls below a certain threshold, the mobile station terminates communication with the base station.
  • the CDMA system uses soft handover technology, which can reduce call drop rate, improve voice quality, and increase the capacity of the system to some extent. Therefore, soft handover is one of the main advantages of the CDMA system.
  • the current network construction is usually limited by the choice of site. Due to factors such as too high base stations and densely spaced stations, the soft handover ratio is too high, which greatly affects the quality of the network. This impact is mainly reflected in the following three aspects: (1) Occupied system resources, mainly occupied channel resources, forward transmit power and WALSH code, resulting in reduced system capacity and increased call congestion; (2) Increased system downlink noise The uplink noise is reduced, but the urban network capacity is generally limited by the downlink, so the increase of noise will reduce the system quality and reduce the capacity; (3) The frequency resource utilization rate is reduced.
  • the pilots are divided into several sets: an active pilot set, a candidate pilot set, an adjacent pilot set, and a remaining pilot set.
  • the active pilot set (hereinafter referred to as the active set) is a pilot assigned to the mobile station and is associated with the forward traffic channel; the candidate pilot set (hereinafter referred to as the candidate set) is not currently in the active set, but has been moved.
  • the pilot received by the station has sufficient strength to indicate that the associated forward traffic channel can be successfully demodulated; the adjacent pilot set (hereinafter referred to as the adjacent set) is not currently in the active set and the candidate set, but Pilots that may be candidates for soft handover; the remaining pilot set (hereinafter referred to as the remaining set) is included in all possible pilot sets in the current system, but does not include the pilots in the active set, candidate set, and neighboring sets frequency.
  • the adjacent pilot set hereinafter referred to as the adjacent set
  • the remaining set is included in all possible pilot sets in the current system, but does not include the pilots in the active set, candidate set, and neighboring sets frequency.
  • the soft handover method currently used is a soft handover method in which both mobile stations and base stations use a static threshold in a CDMA network, that is, a fixed threshold method.
  • the mobile station searches for and detects the pilot strength of the active set, the neighbor set, and the candidate set. When a pilot strength is greater than a specific value, the mobile station sends a pilot strength measurement message (PSMM) to the base station.
  • PSMM pilot strength measurement message
  • the static threshold determines whether this neighboring set pilot is added to the active set, and instructs the mobile station to start handover by sending a handover guidance message (HDM) to the mobile station; or when the strength of an active set pilot is lower than a specific value, and continues After a period of time, the mobile station will also report a pilot strength measurement message (PSMM) to the base station. After the base station uses a static threshold decision, it will send a soft handover guidance message (HDM) to instruct the mobile station to delete the pilot in the active set.
  • HDM handover guidance message
  • This soft handover method only adds pilots to the active set or deletes pilots from the active set according to a fixed threshold.
  • the threshold When the threshold is set high, it will cause a high call drop rate and insufficient coverage of the switching area, thereby reducing the threshold.
  • the value cannot improve the problem that the proportion of soft handover is too high.
  • this method In the case of good network planning and clear cell boundaries, the effect of this method is ideal.
  • this method has two limitations: First, this method cannot accurately adjust and scale the soft handover ratio and network quality; Secondly, this method cannot effectively reduce the proportion of soft handover, thus causing waste of resources.
  • Another soft handover method is a software that uses dynamic thresholds for mobile stations and static thresholds for base stations. Switching method.
  • the mobile station can report the pilot strength measurement message using a dynamic threshold.
  • the calculation formula of the dynamic threshold specified in the agreement of IS95B and above takes the pilot strength of the current active set into consideration. Only when the pilot strength of the candidate set, the adjacent set or the remaining set is higher than the dynamic threshold, or the pilot of the active set, Only when the frequency strength is lower than the dynamic threshold for a period of time will the mobile station report the pilot strength measurement message, and the base station initiates the soft handover after using the static threshold decision.
  • the advantage of this method is that the value of the dynamic threshold can change with the change of the current active set and the wireless environment.
  • the pilot strength of the existing active set is good, it is decided to add a new pilot and delete the old pilot.
  • the soft handover threshold of the frequency will be increased; when the pilot strength of the existing active set is poor, the soft handover threshold of the decision to add a new pilot and delete the old pilot will be reduced.
  • the pilots that remain in the active set after each soft handoff are very necessary and the branch that makes the greatest contribution to the quality of the voice, which can greatly reduce the soft handoff ratio of the network.
  • Soft handover of dynamic threshold is only applicable to mobile stations of IS95B and above, while mobile stations of IS95A do not support the calculation formula of dynamic threshold, so IS95A cannot use the soft handover algorithm of dynamic threshold.
  • the above two methods use the static threshold at the base station side to determine whether to implement soft handover.
  • the dynamic threshold calculated by the formula recommended by the protocol or other formula is used to report the mobile station The pilot strength is judged to determine whether to implement soft handover.
  • the same soft handoff method is used in the entire network, instead of flexibly targeting different network conditions and protocol versions of mobile stations. Adjust the soft handover method. For example, if the entire network is set to static soft handover, the base station and various types of mobile stations use static thresholds. If the dynamic threshold of the base station is turned on, the dynamic thresholds of all types of mobile stations are closed. . Although this method simplifies network settings, it is not conducive to flexibility based on network conditions and mobile station functions. Locally allocating system resources is also not conducive to reducing the proportion of soft handover in CDMA systems. Summary of the invention
  • the purpose of the present invention is to provide a soft handover method for a CDMA system, which can solve the problem of excessively high soft handover ratio of the CDMA system under the premise of ensuring that the communication quality of the network does not decrease, thereby effectively improving the capacity and quality of the network.
  • a soft handover method for a code division multiple access system includes the following steps:
  • A. Detect whether there is pilot pollution in the network. If there is no pilot pollution, the mobile station reports the pilot strength measurement message using a static threshold, and the base station uses the static threshold to determine whether to perform soft handover. If there is pilot pollution, go to step B. ;
  • step B Detect the type of the protocol version of the mobile station that initiated the call request. If the protocol of the mobile station is the IS95A version, perform step C. If the protocol of the mobile station is the IS95B or above version, perform step D;
  • the mobile station reports the pilot strength measurement message using the static threshold, and the base station uses the dynamic threshold to decide whether to perform soft handover;
  • the mobile station reports the pilot strength measurement message using a dynamic threshold, and the base station uses a static threshold to determine whether to perform soft handover.
  • the detection of pilot pollution in step A is to detect pilot conditions of a network. If there is a dominant pilot and the number of pilots with similar pilot strength in the network does not exceed a set value, it is considered that there is no pilot pollution. If there is no dominant pilot, and the number of pilots with similar pilot strength in the network exceeds the set value, it is considered that there is pilot pollution.
  • the step C further includes that the slope parameter sent by the base station to the mobile station is zero.
  • the step D further includes that the slope parameter sent by the base station to the mobile station is non-
  • the step C further includes: the base station monitoring the link quality of the mobile station.
  • the steps for the base station to monitor the link quality of the mobile station are as follows:
  • the base station estimates the frame error rates for the forward and reverse links
  • the base station When the frame error rate exceeds a preset threshold, the base station sends a pilot measurement request instruction to the mobile station, instructing the mobile station to report all pilots whose detected pilot strength exceeds a certain threshold.
  • the instructing the mobile station to report all pilots is to report immediately or periodically.
  • the soft handover method of the CDMA system proposed by the present invention is aimed at different network situations, and uses different combinations of dynamic and static thresholds on the mobile station side and the base station side.
  • the present invention proposes an overall network solution suitable for various types of mobile stations from IS95A to IS2000. This overall network solution solves the problem of a high proportion of soft handovers with purely static thresholds, and also solves the problem due to IS95A Of mobile stations that do not support dynamic thresholds, such mobile stations have a higher proportion of soft handoffs when they are majority in the network, and make full use of the IS95B and above mobile stations that use dynamic thresholds to report pilot strength measurement messages. ability.
  • the method of monitoring the link quality of the mobile station by the base station is introduced, which solves the problem of strong interference in the network caused by the presence of a pilot with a strong signal that does not meet the dynamic threshold.
  • Practical application proves that the present invention can obviously reduce the soft handover ratio of the CDMA system on the premise of ensuring that the call quality of the system does not decrease, and can reasonably allocate system resources, thereby improving the capacity and quality of the system.
  • FIG. 1 is a flowchart of a soft handover method of a CDMA system according to the present invention.
  • FIG. 2 is a flowchart of a mobile station and a base station using a static threshold to implement soft handover at the same time.
  • Figure 3 is a flowchart of the soft handoff implemented by a mobile station using a static threshold and a base station using a dynamic threshold.
  • Figure 4 shows the flow of soft handover using a mobile station using a dynamic threshold and a base station using a static threshold. Illustration. Mode of Carrying Out the Invention
  • the present invention is a soft handover method for a CDMA system. As shown in FIG. 1, the method uses an adaptive method by the base station. According to different network conditions, the static and dynamic thresholds of the soft handoff are used in combination on the base station side and the mobile station side. The specific steps are as follows:
  • Step 101 Detect the pilot pollution situation of the network, and the base station monitors the pilot signal strength of all mobile stations during the call;
  • Step 102 If the detection network has obvious dominant pilots, and the number of pilots with similar pilot strength in the network does not exceed the set value, it is considered that the wireless environment of the network is ideal at this time, and go to step 103; if the monitoring finds that the network The number of pilots with similar pilot strength exceeds the set value, but there is no pilot pilot, it is considered that there is pilot pollution in the network at this time, go to step 105;
  • Step 103 Set the dynamic threshold soft switching control switch to OFF.
  • Step 104 The mobile station uses a static threshold to report the pilot strength measurement result, and uses the static threshold to determine whether to perform soft handover at the base station.
  • Step 105 Set the dynamic threshold soft switching control switch to on.
  • Step 106 Detect a protocol version of the mobile station having a call request
  • Step 107 If it is determined that the protocol of the mobile station having the call request is the IS95A version, go to step 108; if the protocol of the mobile station having the call request is the IS95B or above version, go to step 110;
  • Step 108 The slope parameter sent by the base station to the mobile station is zero, and the mobile station uses the slope parameter to determine the use of the static threshold.
  • Step 109 The mobile station uses a static threshold to report the pilot strength measurement result, and the base station uses a dynamic threshold to determine whether to perform soft handover.
  • Step 110 The slope parameter sent by the base station to the mobile station is non-zero, and the mobile station uses the slope parameter to determine the use of a dynamic threshold;
  • Step 111 The mobile station uses a dynamic threshold to report a pilot strength measurement message, and the base station uses a static threshold to determine whether to perform soft handover.
  • the present invention applies three combinations of static thresholds and dynamic thresholds to mobile stations and base stations respectively: (1) For networks with a more ideal wireless environment, both the mobile station side and the base station side use static thresholds; (2) For networks with pilot pollution, and for mobile stations with the IS95A version of the protocol, the mobile station uses static thresholds to report pilot strength measurement results, and uses dynamic thresholds at the base station to determine whether to perform soft handover; (3) For For a network with pilot pollution, and for mobile stations whose protocol is IS95B or above, the mobile station side uses a dynamic threshold to report the pilot strength measurement message, and the base station side uses a static threshold to judge the reported pilot strength measurement message. The detailed implementation steps for each case are described below.
  • FIG. 1 is a flowchart of the soft handoff implemented by the mobile station and the base station using static thresholds at the same time. The steps are as follows:
  • the mobile station searches and measures the pilot strength (PS) of each set;
  • the mobile station determines whether any pilot strength meets the static threshold, and then the mobile station sends a PSMM to the base station (BS); otherwise, it does not send a PSMM, and continues to search and measure the pilot strength of each set;
  • the base station determines whether the pilot strength reported by the mobile station meets the static threshold, and if so, the base station sends HDM to the mobile station; otherwise, it does not send HDM;
  • the upper ⁇ Gen pilot added to or deleted from the active set active
  • FIG. 3 is a flowchart of a soft handover implemented by a mobile station using a static threshold and a base station using a dynamic threshold. The steps are as follows:
  • the mobile station searches and measures the pilot strength of each set
  • the mobile station determines whether any pilot strength meets the static threshold, and if so, the mobile station sends a PSMM to the base station; otherwise, it does not send a PSMM, and continues to search and measure the pilot strength of each set;
  • the base station calculates a dynamic threshold based on the pilot strength of the current active set
  • the base station determines whether the pilot strength reported by the mobile station meets the dynamic threshold. If so, the base station adds the pilot to the target activation set and sends HDM to the mobile station; otherwise, it does not send HDM; after receiving the HDM, the mobile station receives the HDM according to the target activation set. To perform soft handover; after the mobile station performs soft handover, it sends an HCM to the base station.
  • the method of the present invention uses the method of monitoring the link quality of the mobile station as an auxiliary to the dynamic threshold soft handover method. That is, after the dynamic threshold switch is turned on at the base station side, the base station starts to estimate the forward link in real time. And reverse link frame error rate (FER).
  • FER reverse link frame error rate
  • This FER reflects the quality of the wireless link.
  • the base station considers that the quality of the wireless link is poor at this time, and then issues a pilot measurement request instruction (PMRO) instruction.
  • PMRO pilot measurement request instruction
  • the mobile station reports the pilot strength measurement message in real time or periodically, and requests the mobile station to report all the better pilots of the detected signals to the base station, so that the base station can determine whether to perform a soft handover using a dynamic threshold to avoid the formation of a strong pilot. interference. Steps of the method The steps are also shown in Figure 3:
  • the base station Determine whether the FER exceeds a certain threshold. If so, the base station sends PMRO to the mobile station, instructing the mobile station to report all pilots whose detected pilot strength exceeds a certain threshold immediately or periodically; otherwise, the base station does not send PMRO, and returns an estimate. FER steps.
  • FIG. 4 is a flowchart of soft handover implemented by a mobile station using a dynamic threshold and a base station using a static threshold. Proceed as follows:
  • the mobile station calculates a dynamic threshold based on the pilot strength in the active set
  • the mobile station searches and measures the pilot strength of each set
  • the mobile station determines whether the pilot strength meets the dynamic threshold. If so, the mobile station sends a PSMM to the base station; otherwise, it does not send the PSMM and continues to traverse the pilots of each set.
  • the base station determines whether the pilot strength reported by the mobile station meets the static threshold. If yes, the base station sends HDM to the mobile station; otherwise, it does not send HDM;
  • the mobile station After receiving the HDM, the mobile station implements a soft handover, and adds or deletes the pilot from the active set;
  • the mobile station After the mobile station performs soft handover, it sends an HCM to the base station.
  • the method according to the present invention can be appropriately improved to meet the specific needs of specific situations. Therefore, it can be understood that the specific implementation manner according to the present invention is merely exemplary, and is not used to limit the protection scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de transfert sans coupure dans un système AMCR, dans lequel les stations mobiles et la station de base utilisent des méthodes de transfert sans coupures différentes dans des circonstances de réseaux différentes. Lorsque l'environnement radio dans le réseau est meilleur, les stations mobiles utilisent le seuil statique pour envoyer un message de mesure d'intensité de pilotes, et la station de base utilise le seuil statique pour déterminer s'il y a lieu d'effectuer un transfert sans coupure; lorsqu'une pollution de pilotes se crée dans le réseau et que les stations mobiles sont des stations mobiles IS95A, les stations mobiles utilisent le seuil statique pour envoyer un message de mesure d'intensité de pilotes, et la station de base utilise des seuils dynamiques pour déterminer s'il y a lieu d'effectuer un transfert sans coupure; lorsqu'une pollution de pilotes se crée dans le réseau et que les stations mobiles sont des stations mobiles IS95B ou supérieures, les stations mobiles utilisent des seuils dynamiques pour envoyer un message de mesure d'intensité de pilotes, et la station de base utilise des seuils statiques pour déterminer s'il y a lieu d'effectuer un transfert sans coupure. L'utilisation de ce procédé permet d'assurer la qualité des communications dans le réseau et de réduire efficacement le taux de transferts sans coupure dans le système AMCR, ce qui permet d'augmenter les capacités et la qualité du système AMCR.
PCT/CN2004/001278 2003-12-25 2004-11-10 Transfert sans coupure dans un systeme amcr WO2005064953A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200310113076.7 2003-12-25
CNB2003101130767A CN100359985C (zh) 2003-12-25 2003-12-25 一种降低码分多址系统软切换比例的方法

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WO2005064953A1 true WO2005064953A1 (fr) 2005-07-14

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Publication number Priority date Publication date Assignee Title
CN101222464B (zh) * 2007-01-08 2011-03-02 中兴通讯股份有限公司 一种多载波系统中导频强度上报方法

Citations (4)

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CN1352866A (zh) * 1998-12-18 2002-06-05 艾利森电话股份有限公司 在无线电通信系统中过区切换的动态阈值调整的方法和系统
US6507740B2 (en) * 1999-05-18 2003-01-14 Ericsson Inc. Adaptive threshold of handoff in mobile telecommunication systems
CN1511138A (zh) * 2000-12-22 2004-07-07 ��ʽ�����װ 利用详细的移动状态信息进行接入参数调整与分组数据资源管理

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US5974318A (en) * 1997-07-09 1999-10-26 Northern Telecom Limited Method and system for increasing capacity and improving performance of a cellular network
KR100311506B1 (ko) * 1998-11-04 2001-11-15 서평원 이동통신시스템에서핸드오프제어방법
CN1132471C (zh) * 2000-06-23 2003-12-24 华为技术有限公司 一种cdma系统的软切换方法
KR20030052038A (ko) * 2001-12-20 2003-06-26 엘지전자 주식회사 고속 데이터 통신 망간의 핸드오프 방법

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Publication number Priority date Publication date Assignee Title
US5483669A (en) * 1993-09-09 1996-01-09 Hughes Aircraft Company Dynamic thresholding for mobile assisted handoff in a digital cellular communication system
CN1352866A (zh) * 1998-12-18 2002-06-05 艾利森电话股份有限公司 在无线电通信系统中过区切换的动态阈值调整的方法和系统
US6507740B2 (en) * 1999-05-18 2003-01-14 Ericsson Inc. Adaptive threshold of handoff in mobile telecommunication systems
CN1511138A (zh) * 2000-12-22 2004-07-07 ��ʽ�����װ 利用详细的移动状态信息进行接入参数调整与分组数据资源管理

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