WO2004059892A1 - Procede de controle d'acces dans un systeme de communication cdma - Google Patents

Procede de controle d'acces dans un systeme de communication cdma Download PDF

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Publication number
WO2004059892A1
WO2004059892A1 PCT/CN2003/001111 CN0301111W WO2004059892A1 WO 2004059892 A1 WO2004059892 A1 WO 2004059892A1 CN 0301111 W CN0301111 W CN 0301111W WO 2004059892 A1 WO2004059892 A1 WO 2004059892A1
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WO
WIPO (PCT)
Prior art keywords
power
new user
uplink
downlink
base station
Prior art date
Application number
PCT/CN2003/001111
Other languages
English (en)
Chinese (zh)
Inventor
Dengkun Xiao
Junli Guo
Original Assignee
Da Tang Mobile Communications Equipment 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 Da Tang Mobile Communications Equipment Co., Ltd. filed Critical Da Tang Mobile Communications Equipment Co., Ltd.
Priority to AU2003292868A priority Critical patent/AU2003292868A1/en
Publication of WO2004059892A1 publication Critical patent/WO2004059892A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/06—Access restriction performed under specific conditions based on traffic conditions
    • 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
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • the present invention relates to mobile communication technology, and more particularly to an admission control method in a code division multiple access (CDMA) mobile communication system.
  • CDMA code division multiple access
  • the call admission (or access) control is to solve the problem: when there is a new call or a handover (H0) request, the wireless network controller (RNC) Accept or reject based on certain criteria. After the network accepts a new connection, the quality of service (QoS) of the existing connection and the quality of service of the newly connected user should be met. Therefore, how to maximize the system capacity without affecting the service quality of the connected users has become a major problem to be solved by call admission control.
  • the CAC problem is a problem that must be solved for both wired and wireless networks. Since the CDMA system is a system with limited interference, its special wireless environment makes the admission problem more complicated.
  • N-CDMA narrowband-code division multiple access
  • the performance indicators related to admission control technology include call blocking rate, handover blocking rate, and so on.
  • call blocking rate the key technologies involved in CDMA have an impact on admission control.
  • power control resource allocation, handover, and topology.
  • FIG. 1 a schematic structure of a TD-SCDMA wireless communication system is shown (only functional modules related to the technical solution of the present invention are shown).
  • the system is composed of multiple user equipments (UEs) 100, multiple base stations (Node Bs) 110, and radio network controllers (RNCs) 120.
  • the user equipment 100 therein can move within different cell ranges of the system.
  • the radio network controller 120 is the core part of the system, and mainly includes three major functional parts: dynamic channel allocation 123, call access control 122, and parameter library 121, which are framed by dashed lines.
  • the process of the system for admission control is: the user equipment 100 (UE) sends a call request to the network side (radio access network RAN) through the base station 110 (Node B), and the call request carries a measurement report related to access control And carrier-to-interference ratio parameters; Node B reports measurement reports related to admission control; the RNC uses a certain algorithm based on the Node B measurement report, UE's carrier-to-interference ratio parameters, and other system parameters (such as the network resource usage measured by the UE). Judge with access criteria, and return the final judgment result, including access or rejection, to Node B, and then Node B to UE. If the message of successful acceptance is returned, it also includes adjustment information for transmission power and information for re-allocation of radio resources for the user equipment 100 (UE) to determine its own initial transmission power and code channel.
  • the dynamic channel allocation 123 receives an access request from the base station 110 Message, and determine a higher priority time slot as the user's access time slot.
  • the parameter library 121 contains three types of parameters: channel model parameters, service model parameters, and system model parameters.
  • the parameter database 121 refreshes parameters in the network according to the measurement reports of the user equipment 100 and the base station 110.
  • the call access control 122 performs an admission decision in the time slot selected by the dynamic channel allocation 123 according to the network parameters in the parameter database 121, and returns the decision result to the dynamic channel allocation 123.
  • the dynamic channel allocation 123 sends a return message of the access application to the base station 110 according to the decision result. Summary of the invention
  • the purpose of the present invention is to design a fast and efficient admission control method for a code division multiple access mobile communication system, which can reflect the interference situation of the users to be accessed in real time and the actual change of the load in the system after accessing the users. Make full use of the system capacity, and have the advantages of small calculation volume, fast calculation speed, and real-time operation.
  • An admission control method in a code division multiple access mobile communication system includes: a new user sends a request for admission, and the admission request carries measurements related to admission control The report, the carrier-to-interference ratio parameters of the new user, and other parameters of the system; the radio network controller performs admission control including admission or rejection according to the measurement report, the carrier-to-interference ratio parameters of the new user, and other parameters of the system, which is characterized by The admission or rejection admission control further includes:
  • Admission is allowed when all the power discrimination criteria are met, and one is rejected if one of them does not meet the power discrimination criteria.
  • the total uplink received power of the base station after accessing a new user is an increase in the total uplink received power actually measured by the base station before the new user accesses and the uplink power of the base station after the new user accesses.
  • the sum of AP u _ k + 1 ; the total downlink transmit power of the base station after accessing the new user is the total downlink transmit power actually measured by the base station before the new user accesses and the initial downlink transmit power after the new user accesses
  • the sum of the incremental APs dJ + 1 , k + 1, j + 1 respectively represents new users for uplink and downlink access, u represents uplink, d represents downlink, and P represents power;
  • the uplink initial transmit power AP UJc + 1 I gu_ k + l,, gu_ k + i represents the uplink path loss factor of the new user.
  • step B comparing the calculated total uplink receive power, total downlink transmit power, and initial uplink transmit power of the new user with the respective power discrimination criteria of the base station after accessing the new user further includes: Under the condition that the total downlink transmit power and uplink receive power of the user remain unchanged at the moment of new user access, determine whether the total uplink receive power of the base station after accessing the new user is less than a given uplink receive power threshold; Whether the total downlink transmit power of the base station after the user is less than a given downlink transmit power network value; and determining whether the uplink initial transmit power of the new user is less than or equal to its uplink transmit power alarm value and greater than or equal to its minimum transmit power.
  • the technical solution of the present invention is an admission control scheme based on actual measurements.
  • the actual measured values are used to directly calculate the total uplink and downlink receive and transmit powers after accessing the user, so it can reflect the real-time requirements of the users to be accessed.
  • the interference situation and the actual change of the load in the system can make full use of the system capacity.
  • the actual measured value of the base station is directly used to calculate the upper limit of the user to be accessed.
  • the total received power and downlink transmitted power and the load of the system after the new user accesses are simple and easy to implement.
  • the calculation results can satisfy the new carrier's carrier-to-interference ratio (the ratio of carrier power to perturbation power).
  • the measured value can reflect the interference and system load of users in the time slot to be accessed in real time
  • Figure 1 is a block diagram of the principle structure of a TD-SCDMA wireless communication system
  • FIG. 2 is a basic flow block diagram of the admission control method of the present invention. Mode for Carrying Out the Invention The present invention is described in detail below with reference to the drawings.
  • the present invention is a fast and efficient CAC method for a CDMA wireless communication system. It calculates the total downlink transmit power and total uplink receive power of a base station after a new user accesses based on actual measured values, and uses load-based discrimination criteria. Admission control for new users.
  • FIG. 2 shows the main flow of the call access control method in the present invention. It can be summarized as follows: Step 200: A new user issues a call request; Step 201: The radio network controller performs admission control in a given time slot according to the call request, and obtains a carrier-to-interference ratio parameter of a new user in a time slot to be accessed and a related measurement value of the network.
  • Step 202 the following measurement method is adopted, that is, first assume that the new user can access, and directly use the currently measured total uplink receive power value and the total downlink transmit power value of the base station, and after calculating the access to the new user, Total power, total downlink transmission power, and calculating the uplink initial transmission power of the new user;
  • Step 203 Compare the calculated total uplink receive power, total downlink transmit power, and initial uplink transmit power of the new user with the set standard according to the power discrimination criterion.
  • Step 204 When the calculated total uplink receive power, total downlink transmit power, and new user ’s initial uplink transmit power of the base station cannot meet the respective set standards (one of them), the base station sends the new user to the base station through the base station. The result of the rejection;
  • Step 205 When the calculated total uplink receive power, total downlink initial transmit power, and new user's initial uplink transmit power of the base station can meet the respective set standards, the base station and the new user are permitted to receive admission information through the base station. critical result.
  • the core content of the above steps includes a measurement method and judging whether the calculated total uplink and downlink power in the time slot to be accessed meets the power discrimination criterion according to the calculation result: if it is satisfied, then access is allowed; otherwise, it is rejected.
  • the user's uplink and downlink admission calculation process in a TD-SCDMA system is taken as an example to explain the solution of the measurement method of the present invention.
  • the uplink admission process will be explained first.
  • the uplink carrier-to-interference ratio of the new user can be expressed by the signal power, noise, and interference (including interval interference and signal power of other users) of the new user. If new technologies such as smart antennas, joint detection, and synchronization are used, the multiple access interference processing factor added before the signal power of other users is less than one.
  • the uplink target load ratio of new users can be expressed as:. Among them, U represents the uplink, ⁇ +1 represents the uplink carrier-to-interference ratio of the new user, C represents the carrier power of the new user, and / represents the interference power experienced by the new user.
  • /iller Jnte +1 is the inter-cell uplink interference power
  • P w is the system thermal noise power
  • _ in ⁇ +1 is the base station
  • the received total interference power to the new user is the processing factor of the system for uplink multiple access interference.
  • the core of the measurement method of the present invention is that it assumes that the uplink and downlink signal power of existing users in a given time slot of a given cell before and after the new user accesses remain unchanged, so that the interference experienced by the new user can be accessed by the new user.
  • the actual measured values (total uplink received power and total downlink transmitted power) of the former base station are used to approximately calculate the interference value experienced by the new user after access, so as to obtain the total uplink received power and total downlink transmitted power after the new user access. Therefore, the uplink initial transmit power of the new user can be directly calculated from the measured value of the base station (the signal power of the new user received by the base station) and the uplink target carrier-to-interference ratio of the new user.
  • the power control module further adjusts the user's transmit power in real time based on parameters such as the carrier-to-interference ratio.
  • Incremental uplink interference system (delta power) after the new user access caused ⁇ "_ ⁇ may represent a new user to a base station received signal power, namely:
  • AP U _ M uplink interference power received by the new user X uplink target carrier-to-interference ratio of the new user (2) where the uplink interference power received by the new user can be calculated using the measurement value of the base station. Because when the new user accesses, the interference situation may be different from the most recent measurement, the signal power of the new user received by the base station obtained in the above expression is an approximate value.
  • the calculation of the downlink transmit power is the same as that of the uplink, except that the path loss factor must be considered during the calculation. It is assumed that when a new call arrives, there are already j users in the designated time slot of the designated cell.
  • the system After the new user accesses, the system ’s downlink power increment ⁇ / ⁇ . +1 can be expressed as the signal power transmitted by the base station to the new user:
  • AP d _ M (downlink interference power received by the new user x downlink target carrier-to-interference ratio of the new user) / Path loss factor for new users (3)
  • the downlink interference power received by the new user can be calculated according to the actual measurement value of the base station before accessing the new user.
  • the path loss factor of the new user is between 0 and 1.
  • the term in the right parenthesis of formula (3) is the power expected to be received by the new user. After this term and the path loss factor are taken into account, the power value that the base station should transmit to the new user.
  • d represents the downlink
  • C represents the carrier power of the new user
  • / represents the interference power experienced by the new user.
  • ' 1.' + 1) is the signal power transmitted by the base station to the i-th user
  • / ⁇ +1 is the inter-cell downlink interference power to access new users
  • P w is the system thermal noise power
  • ⁇ +1 It is the downlink interference power received by new users after access.
  • a rf is the processing factor of the system for downlink multiple access interference.
  • the processing factors " wool, a d when the mobile communication system uses one or all of new technologies such as smart antennas, joint detection, and synchronization, its value is less than 1 or even zero ( When all are used, the processing factor tends to zero); when the system does not all adopt new technologies such as smart antennas, joint detection, and synchronization, its value is 1
  • the total uplink received power of the base station after accessing the new user is the sum of the predicted total received power of the base station in the X + 1 frame and the uplink power increase AP u _ k + 1 of the base station after the new user accesses,
  • the uplink power increment AP u _ k + 1 _3 ⁇ 4_ after the new user accesses the total received power at the X + 1 frame X the uplink target carrier-to-interference ratio of the new user.
  • the power discrimination criteria of the access control method of the present invention are given below.
  • the criteria should ensure that after accessing a new user: 1) The sum of the uplink receive power and the downlink transmit power of the base station to all users does not exceed a given value.
  • the uplink path loss factor of the user is approximately equal to the downlink path loss factor
  • A represents the redundancy factor of the user's transmit power
  • ⁇ + L max represents the uplink transmit power threshold of the new user .
  • the uplink and downlink admission control can be performed according to the steps in the embodiment.

Abstract

L'invention concerne un procédé de contrôle d'accès dans un système de communication basé sur des valeurs réellement mesurées. Un nouvel abonné envoie une demande de communication pour l'accès ; un contrôleur à réseau radio (RNC) admet, ou refuse, le contrôle d'accès. Le contrôle d'accès comprend : à supposer que le nouvel abonné puisse être contacté, l'utilisation directe de la valeur mesurée en réalité, de la puissance reçue, en liaison montante, de toute la station de base, et transmise en liaison descendante, après que le nouvel abonné a été contacté ; la comparaison de la puissance reçue, en liaison montante de la station de base, la puissance transmise, en liaison descendante, à la station de base, et la puissance initiale, en liaison montante, du nouvel abonné, après que le nouvel abonné ait été contacté, respectivement, par ses propres critères d'appréciation, si toutes les conditions sont remplies, après quoi, admission à l'accès ou, cas échéant, refus de l'accès, si l'une quelconque des conditions n'est pas remplie, ce qui est l'indice d'une ingérence de l'abonné demandant l'accès et du changement réel de la charge du système. Il y a possibilité d'utiliser la pleine capacité du système au moyen d'un léger calcul rapide avec opération réelle.
PCT/CN2003/001111 2002-12-24 2003-12-24 Procede de controle d'acces dans un systeme de communication cdma WO2004059892A1 (fr)

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Application Number Priority Date Filing Date Title
AU2003292868A AU2003292868A1 (en) 2002-12-24 2003-12-24 Access control method in cdma communication system

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CN02158075.8 2002-12-24
CNB021580758A CN1182673C (zh) 2002-12-24 2002-12-24 码分多址移动通信系统中的一种接纳控制方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103391593A (zh) * 2013-07-24 2013-11-13 西安交通大学 Lte-a中继系统中基于受迫切换的呼叫接纳控制方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100433892C (zh) * 2004-07-28 2008-11-12 上海贝尔阿尔卡特股份有限公司 无线移动通信系统中下行呼叫准入控制方法及装置
WO2006094429A1 (fr) * 2005-03-07 2006-09-14 Zte Corporation Procede de commande d'admission de canal partage descendant a haute vitesse
CN100442937C (zh) * 2006-05-25 2008-12-10 华为技术有限公司 准入判决与拥塞判决方法
CN101516124B (zh) * 2008-02-20 2011-10-26 中兴通讯股份有限公司 一种td-scdma系统的接纳控制方法及装置
CN101399619B (zh) * 2008-10-28 2013-03-27 深圳市国人射频通信有限公司 一种直放站底噪抑制的方法、装置及数字直放站
CN104093156B (zh) * 2014-07-24 2017-11-14 京信通信系统（中国）有限公司 分布式基站系统的从站设备地址分配方法和系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1340279A (zh) * 1999-02-16 2002-03-13 诺基亚网络有限公司 一种允许接入的控制方法
CN1361606A (zh) * 2000-12-29 2002-07-31 深圳市中兴通讯股份有限公司 一种宽带码分多址系统中上行接纳控制方法
CN1373572A (zh) * 2001-03-01 2002-10-09 深圳市中兴通讯股份有限公司 一种宽带码分多址系统混合业务的接纳控制方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1340279A (zh) * 1999-02-16 2002-03-13 诺基亚网络有限公司 一种允许接入的控制方法
CN1361606A (zh) * 2000-12-29 2002-07-31 深圳市中兴通讯股份有限公司 一种宽带码分多址系统中上行接纳控制方法
CN1373572A (zh) * 2001-03-01 2002-10-09 深圳市中兴通讯股份有限公司 一种宽带码分多址系统混合业务的接纳控制方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103391593A (zh) * 2013-07-24 2013-11-13 西安交通大学 Lte-a中继系统中基于受迫切换的呼叫接纳控制方法
CN103391593B (zh) * 2013-07-24 2016-06-08 西安交通大学 Lte-a中继系统中基于受迫切换的呼叫接纳控制方法

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CN1445952A (zh) 2003-10-01
CN1182673C (zh) 2004-12-29

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