BR0209278A - Método de adaptação de ligação em sistemas celulares otimizados para diferenciar entre variabilidade alta e baixa - Google Patents

Método de adaptação de ligação em sistemas celulares otimizados para diferenciar entre variabilidade alta e baixa

Info

Publication number
BR0209278A
BR0209278A BR0209278-6A BR0209278A BR0209278A BR 0209278 A BR0209278 A BR 0209278A BR 0209278 A BR0209278 A BR 0209278A BR 0209278 A BR0209278 A BR 0209278A
Authority
BR
Brazil
Prior art keywords
bler
filtered
mcs
thresholds
tables
Prior art date
Application number
BR0209278-6A
Other languages
English (en)
Other versions
BRPI0209278B1 (pt
Inventor
Sergio Parolari
Original Assignee
Siemens Mobile Comm Spa
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 Siemens Mobile Comm Spa filed Critical Siemens Mobile Comm Spa
Publication of BR0209278A publication Critical patent/BR0209278A/pt
Publication of BRPI0209278B1 publication Critical patent/BRPI0209278B1/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H04L1/002—Algorithms with memory of the previous states, e.g. Markovian models
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
    • H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Artificial Intelligence (AREA)
  • Probability & Statistics with Applications (AREA)
  • Nonlinear Science (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Waveguide Aerials (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

"MéTODO DE ADAPTAçãO DE LIGAçãO EM SISTEMAS CELULARES OTIMIZADOS PARA DIFERENCIAR ENTRE VARIABILIDADE ALTA E BAIXA". A invenção refere-se a um método para efetuar adaptação de ligação nas interfaces de rádio de uma rede celular de dados em pacote otimizada que manipula diversos Esquemas de Modulação e Codificação (MCS) para maximizar a produção de dados. Em uma etapa fora de linha preliminar, o comportamento do sistema, em termos de produção líquida dos diversos MCSs disponíveis, é simulado para diferentes condições de C/I. A partir da simulação, são obtidos dois conjuntos de tabelas, cada uma incluindo limites ascendente e descendente expressos em termos de Taxa de Erro de Bloco (BLER). Os limites correspondem a pontos de comutação a partir de um MCS para os dois MCSs disponíveis que possuem a proteção imediata menor ou maior. Os dois conjuntos de tabelas se referem a ambientes de RF de maior ou menor diversidade, e se especializam mais ainda para levar em consideração ARQ híbrido do tipo II EGPRS, qual seja, Redundância Incremental (IR). Durante a transmissão, os blocos transmitidos são verificados quanto a FEC, e os resultados são enviados para a rede. A rede atualiza continuamente a BLER usando nivelamento exponencial. A fim de obter a resposta de tempo correta, independentemente do fato dos blocos de RLC serem ou não recebidos, é provido um filtro de confiabilidade cuja saída é usada para decidir o peso entre as medições novas e antigas para tomar a resposta de impulso de filtro de BLER exponencialmente decrescente com o tempo. A eficiência de IR é testada para cada bloco que chega, e uma variável IR_status indicativa é filtrada usando a mesma abordagem adotada para a BLER. Cada limite real de BLER a ser usado em adaptação de ligação é obtido por uma interpolação linear entre o limite disposto em tabela sem IR e com IR perfeita, ambos ponderados com IR_status filtrado. A BLER filtrada é em seguida comparada com os referidos limites interpolados para testar a chegada de uma condição de comutação de MCS. O controle de potência tem por objetivo manter constante a produção de pico de QoS por intervalo de tempo (figura 16).
BRPI0209278A 2001-04-30 2002-04-08 método de adaptação de ligação em sistemas celulares otimizados para diferenciar entre variabilidade alta e baixa BRPI0209278B1 (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP01830283A EP1255368A1 (en) 2001-04-30 2001-04-30 Method to perform link adaptation in enhanced cellular communication systems with several modulation and coding schemes
PCT/EP2002/003881 WO2002091655A1 (en) 2001-04-30 2002-04-08 Method of link adaptation in enhanced cellular systems to discriminate between high and low variability

Publications (2)

Publication Number Publication Date
BR0209278A true BR0209278A (pt) 2004-07-13
BRPI0209278B1 BRPI0209278B1 (pt) 2016-04-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0209278A BRPI0209278B1 (pt) 2001-04-30 2002-04-08 método de adaptação de ligação em sistemas celulares otimizados para diferenciar entre variabilidade alta e baixa

Country Status (8)

Country Link
US (1) US7289574B2 (pt)
EP (2) EP1255368A1 (pt)
CN (1) CN1309195C (pt)
AT (1) ATE299321T1 (pt)
BR (1) BRPI0209278B1 (pt)
DE (1) DE60204962D1 (pt)
PT (1) PT1384344E (pt)
WO (1) WO2002091655A1 (pt)

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