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WO2004068759A1 - Procede de controle d'admission d'appels dans un systeme de communications mobiles de type amrc - Google Patents

Procede de controle d'admission d'appels dans un systeme de communications mobiles de type amrc Download PDF

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Publication number
WO2004068759A1
WO2004068759A1 PCT/CN2003/001112 CN0301112W WO2004068759A1 WO 2004068759 A1 WO2004068759 A1 WO 2004068759A1 CN 0301112 W CN0301112 W CN 0301112W WO 2004068759 A1 WO2004068759 A1 WO 2004068759A1
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WIPO (PCT)
Prior art keywords
power
user
new user
base station
uplink
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Ceased
Application number
PCT/CN2003/001112
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English (en)
Chinese (zh)
Inventor
Dengkun Xiao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Datang Mobile Communications Equipment Co Ltd
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Datang 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 Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Priority to AU2003296203A priority Critical patent/AU2003296203A1/en
Publication of WO2004068759A1 publication Critical patent/WO2004068759A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference

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 (CALC) problem is a problem that must be solved for both wired and wireless networks.
  • the problem that CAC needs to solve is:
  • the radio network controller (RNC) accepts or rejects it according to certain criteria.
  • the amount of user service shield (Quality of Service, QoS for short) of the existing connection and the quality of service of the user of the new connection should be met.
  • A is a modulation and multiple access technology based on spread-spectrum communication.
  • a base station and a user equipment use the same radio frequency band.
  • its special wireless environment To make the admission problem more complicated, how to maximize the system capacity without affecting the quality of service of connected users has become the main problem to be solved by call admission control.
  • N-CDMA narrowband-code division multiple access
  • SIR uplink-to-downlink carrier-to-interference ratio
  • CAC In IS-95 CDMA systems, CAC mostly adopts interference threshold-based admission schemes, and often sets the threshold value according to the worst case. If the power of all existing users in the current system exceeds the given threshold, the new user will Will be rejected.
  • This interference threshold-based admission scheme does not consider the dynamic characteristics of the system, which reduces the capacity utilization of the system, resulting in waste of resources.
  • the SIR parameters of all users cannot be guaranteed. Can be satisfied.
  • the CAC When the CAC initially accesses the terminal equipment (UE), establishes a radio bearer, switches over, and the UE in the connected mode needs to add services, it invokes the corresponding algorithm to make or accept or reject according to parameters such as QoS and radio resource usage. judgment. Under different system characteristics and network operation environments, different access control schemes can be adopted.
  • the performance indicators involved in admission control technology include call blocking rate, handoff blocking rate, and call drop rate.
  • the key technologies involved in CDMA have an impact on admission control.
  • power control resource allocation, handover, and topology.
  • the system is composed of multiple user equipments (UEs) 100, multiple base stations (Node Bs) 110, and radio network controllers (RNCs) 120. Users
  • the device 100 can move within different cell ranges of the system.
  • the radio network controller 120 is a core part of the system, and mainly includes three major function parts: dynamic channel allocation 123, call access control 122, and parameter database 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; RNC according to the ode B measurement report, UE's carrier-to-interference ratio parameters, and other system parameters (network resource usage measured by the UE, etc.)
  • the algorithm and the access criteria are used to judge, and the final judgment result, including access or rejection, is returned to the Node B, and then the Node B is returned to the UE. If the message that the admission is successful is returned, it also includes the adjustment signal for the transmission power and the information on the reallocation of the radio resources, so that the user equipment 100 (UE) determines its own initial transmission power and code channel.
  • the dynamic channel allocation 123 receives the access application message sent by the base station 110, and determines a time slot with a higher priority 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 an admission control method for a CDMA mobile communication system. While making an admission or rejection decision for a new user call, it can satisfy the SIR parameters of all users, and can also directly obtain access for new users. All users in the system (including connected users and New user), and obtain the initial transmit power that meets the new user's carrier-to-interference ratio.
  • An admission control method in a code division multiple access mobile communication system includes: a new user sends a call request requesting admission control, and the call request is associated with admission control According to the measurement 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, It is characterized in that said admission control of admission or rejection further includes:
  • A Under the assumption of the new user to access, the user is to take a new cell where access slot by the expression of a column vector signal power of all users existing composition of the new user / ⁇ ) --1 ./ ⁇ , where A is a coefficient matrix related to the total number of access users and their target carrier-to-interference ratio, and the vector I in r describes the interval interference experienced by all access users;
  • the expression of the signal power of the access user includes the signal power received by the base station in the uplink case including the existing user and the new user, and the signal power transmitted by the base station in the downlink case to the existing user and the new user.
  • p d- ⁇ A d y- ⁇ u means uplink, and d means downlink;
  • step B it is judged whether the inverse matrices J- 1 and (A) -1 can be solved, respectively;
  • step C when the inverse matrix () -1 or () -1 cannot be solved, the system refuses to accept the new user;
  • step D when the inverse matrices 1 and 1 can be solved at the same time, the step is continuously performed.
  • the method of the present invention uses a matrix method (hence the CAC method based on matrix calculation) to calculate The uplink receive power and the downlink transmit power adopt the discrimination criterion based on the load (power threshold) to control admission or rejection.
  • the target carrier-to-interference ratio of each user is used to participate in the calculation, so that the carrier-to-interference ratio of all users is satisfied; the decision criterion is to meet the system load limit as the goal, so it can meet the system load requirements.
  • the method of the present invention has the following characteristics:
  • the adopted matrix method can directly calculate a new power balance point for all users (including connected users and new users) in the system after the new user is accessed; Than the initial transmit power of the condition.
  • P (AY-l mr )
  • the matrix method combines the carrier-to-interference ratio parameters of all users with the calculation of the transmission power.
  • the calculated transmission power must meet the user's SIR, thereby reducing the access due to new calls
  • the rate of dropped calls can reduce system overhead after access.
  • the method of the present invention not only calculates the initial downlink transmission power for the new user and the uplink transmission power for the new user, but also obtains the cell where the new user is located (the time when the TDD system is located). Gap) Power balance point for existing users.
  • Figure 1 is a schematic block diagram of the TD-SCDMA wireless communication system
  • FIG. 2 is a basic flow block diagram of the admission control method of the present invention. Mode of Carrying Out the Invention
  • the matrix-based CAC method embodies the idea that the SIR value of each connected user and new user can use the user ’s own useful signal strength, noise, and interference (including inter-cell interference and other users ’signal strength The user). Considering: The value of noise is small and can be ignored; Inter-cell interference changes very slowly (If new technologies such as smart antennas, multi-user detection, and uplink synchronization are used, the interference value will be small, which is reflected in the multi-access interference processing factor tillAll features are less than .1. If these new technologies are not adopted, the multiple access interference processing factor is 1). Therefore, the signal power of each user can use its carrier-to-interference ratio, inter-cell interference, and the same Signal power of other users in the time slot.
  • the coefficient matrix reflects the system's ability to suppress interference and the SIR requirements of each user, where the elements on the diagonals in each row represent the The user's SIR requirements, other elements indicate the system's ability to suppress interference, all are -1.
  • the vector / represents the interval interference received by the base station and can be measured. For all users, this value can be considered constant.
  • the vector P represents the sum of the signal powers of all users received by the base station. (K + 1) (k + 1) indicates that the matrix has (k + 1) rows and (k + 1) columns, and (k + 1) X 1 indicates that the matrix has (k + 1) rows and 1 column. Where T indicates that the matrix is transposed.
  • the signal power sent by the base station to user i; g rf — is the path loss factor from the base station (Node B) to the i-th user; received for the i-th mobile terminal user (UE) in the specified access slot
  • (j + 1) X (j + 1) indicates that the matrix has (j + 1) rows and (j + 1) columns, and U + 1) xl indicates that the matrix has (j + 1) rows and 1 column.
  • the superscript T in the formula indicates that the matrix is transposed.
  • the resulting vector P will automatically satisfy the user's carrier-to-interference conditions.
  • the call admission control method can be summarized as the following steps:
  • Step 200 Receive a DCA command, that is, a given CAC time slot and a command for determining admission in this time slot;
  • Step 201 Obtain a carrier-to-interference (or SIR) parameter of a connected user and a newly accessed user in a time slot to be accessed, and a related measurement value of a network;
  • SIR carrier-to-interference
  • Step 202 Assuming that new users can access, use a matrix method to calculate the total uplink receive power of the base station after all users (including connected users and new users) have accessed, the total downlink transmit power of the base station, and the uplink initial transmit power of the new user. ;
  • Step 203 The calculated sum of the uplink signal powers of all users received by the base station, the base station compares the sum of the downlink transmission power of all users and the initial uplink transmission power of the new user with their respective power discrimination criteria, and both meet the criteria.
  • the access is allowed (step 205), one of them does not meet the discrimination criteria and refuses (step 204, waiting to accept the next DCA command ⁇ )
  • the power discrimination criterion of the access control method of the present invention should ensure that after accessing a new user: 1 ) The sum of the uplink receive power of the base station to all users does not exceed a given uplink power threshold, and the uplink transmit power of the user does not exceed its own uplink transmit power threshold and is not lower than its own minimum transmit power; 2) the base station to all users The sum of the downlink transmit power does not exceed the given The downlink power threshold; 3)
  • the uplink and downlink powers of existing users after accessing new users are recalculated according to their respective target carrier-to-interference ratio
  • p UJmsMd lP dJhreshold represents the power threshold (load threshold) of the total uplink power received by the base station / the total downlink power transmitted by the base station.
  • p i + l min is the minimum transmit power allowed by the new user, and is the maximum transmit power allowed by the new user.
  • ⁇ is the signal power of the new user received by the base station, is the uplink path loss factor of the new user, ⁇ is the redundancy factor of the transmission power of the new user, and ⁇ ⁇ . +1 , max is the uplink transmission power threshold of the new user.
  • Formulas (4) (6) are used for the uplink, and (5) are used for the downlink.
  • the access control method of the present invention uses a matrix-based method to calculate the uplink and downlink receive power and transmit power after accessing a new user, and calculates the initial transmit power of a new user.
  • the target carrier-to-interference ratio of all users in the gap is the premise of calculation, so the calculation results obtained automatically meet the carrier-to-interference condition. If a new call can be accessed, both the uplink power it sends to Node B and the downlink power it sends to it can be easily calculated.
  • the working principle of the matrix-based calculation method of the present invention is suitable for all CDMA systems.
  • FDD CDMA since there is no DCA command for selecting a time slot to be accessed for a new user, its CAC can directly perform admission control in a designated cell according to the method of the present invention (including calculation of power and discrimination criteria).

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

Abstract

La présente invention a trait à un procédé de contrôle d'admission d'appels dans un système de communications mobile de type AMRC, basé sur le procédé de calcul matriciel. Un nouvel usager envoie une requête d'appel de demande d'admission ; le contrôleur du réseau de radiocommunications effectue un contrôle d'admission comprenant l'acceptation ou le refus. Le contrôle d'admission comprend : la prise en compte de l'expression de la puissance totale pour tous les signaux d'usagers dans la cellule et dans la fenêtre d'accès dans laquelle l'usager se trouve P0(A)-1, Iinter ; l'estimation de la solution de la matrice inverse (A)-1 ; si la matrice inverse (A)-1 ne peut être résolue, le système va refuser l'admission au nouvel usager ; si la matrice inverse peut être résolue (A)-1, le calcul supplémentaire de la puissance totale de réception en liaison montante et de la puissance totale de transmission en liaison descendante de la station de base à laquelle accède le nouvel usager, et la comparaison du critère de l'estimation de puissance de l'une et de l'autre ; si la puissance totale satisfait le critère d'estimation de puissance, l'autorisation d'admission, si l'une desdites puissances ne satisfait pas le critère d'estimation de puissance, le refus d'admission. Le système permet de satisfaire automatiquement la condition SIR, simplifier le contrôle de puissance en boucle ouverte, réduire l'encombrement du réseau de radiocommunication, et réduire le processus du signalisation.
PCT/CN2003/001112 2002-12-24 2003-12-24 Procede de controle d'admission d'appels dans un systeme de communications mobiles de type amrc Ceased WO2004068759A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003296203A AU2003296203A1 (en) 2002-12-24 2003-12-24 A method of call admission control in coma mobile communication system

Applications Claiming Priority (2)

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CNB02158074XA CN1172473C (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
CN02158074.X 2002-12-24

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CN100372422C (zh) * 2004-09-28 2008-02-27 大唐移动通信设备有限公司 基于智能天线实现交叉时隙的动态信道分配方法
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
CN101170376B (zh) * 2006-10-27 2011-01-19 中兴通讯股份有限公司 一种宽带码分多址系统中的业务接纳方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
US5907543A (en) * 1996-04-24 1999-05-25 Electronics And Telecommunications Research Institute Method for allocating a call in a CDMA base station
CN1315125A (zh) * 1998-06-26 2001-09-26 艾利森电话股份有限公司 无线通信网络中的呼叫允许接入控制
CN1371226A (zh) * 2001-02-09 2002-09-25 株式会社Ntt都科摩 基于基站发送功率的呼叫允许控制的设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907543A (en) * 1996-04-24 1999-05-25 Electronics And Telecommunications Research Institute Method for allocating a call in a CDMA base station
CN1315125A (zh) * 1998-06-26 2001-09-26 艾利森电话股份有限公司 无线通信网络中的呼叫允许接入控制
CN1371226A (zh) * 2001-02-09 2002-09-25 株式会社Ntt都科摩 基于基站发送功率的呼叫允许控制的设备

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CN1172473C (zh) 2004-10-20
CN1445951A (zh) 2003-10-01

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