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WO2006104371A1 - Procede et systeme pour attribuer une modulation adaptative et coder un sous-canal pour une utilisation dans un reseau internet portable - Google Patents

Procede et systeme pour attribuer une modulation adaptative et coder un sous-canal pour une utilisation dans un reseau internet portable Download PDF

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Publication number
WO2006104371A1
WO2006104371A1 PCT/KR2006/001223 KR2006001223W WO2006104371A1 WO 2006104371 A1 WO2006104371 A1 WO 2006104371A1 KR 2006001223 W KR2006001223 W KR 2006001223W WO 2006104371 A1 WO2006104371 A1 WO 2006104371A1
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Prior art keywords
pss
ras
band
bands
total
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PCT/KR2006/001223
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English (en)
Inventor
Hongseo Ha
Daeyong Lim
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SK Telecom Co Ltd
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SK Telecom Co Ltd
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Publication of WO2006104371A1 publication Critical patent/WO2006104371A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • 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
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0892—Network architectures or network communication protocols for network security for authentication of entities by using authentication-authorization-accounting [AAA] servers or protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the present invention relates to a method and a system for allocating an Adaptive Modulation and Coding (hereinafter, referred to as AMC) subchannel in a portable Internet network. More particularly, the present invention relates to a method and a system for allocating an AMC subchannel in a portable Internet network using a Personal Subscriber Station (hereinafter, referred to as PSS) which transmits a Signal to Interference and Noise Ratio (hereinafter, referred to as SINR) value, in which a Radio Access Station (hereinafter, referred to as RAS) allocates a channel in order to exchange data with a PSS, computes the number of Orthogonal Frequency Division Multiplex (hereinafter, referred to as OFDM) symbols required according to bands, compares the computed number of OFDM symbols with the number of symbols actually provided to the PSS, generates a list of user groups to which an AMC subchannel is to be redistributed, and efficiently redistributes the AMC subchannel to the PSS.
  • the most basic wireless communication service is a wireless voice communication service for providing voice communication to mobile communication terminal users in wireless manner, which has a characteristic of providing the service to the users regardless of time and place. Further, the wireless communication service supplements a voice communication service by providing a text message service. Recently, a wireless Internet service has emerged, which provides an Internet communication service to mobile communication terminal users through a wireless network.
  • a service provided by a CDMA mobile communication system is being developed into a multimedia communication service for the transmission of data such as circuit and packet data, including a conventional voice service.
  • IMT International Mobile Telecommunication
  • 3X 3X
  • EV-DO Wideband CDMA
  • WCDMA Wideband CDMA
  • the IMT- 2000 corresponds to a service capable of wireless Internet at a maximum transmission speed of 144 Kbps far faster than 14.4 Kbps or 56 Kbps, which is a data transmission speed supported by an Interim Standard (hereinafter, referred to as IS)-95A network or an IS-95B network, by means of an IS- 95C network evolved from the existing IS-95A network and IS- 95B network.
  • IS Interim Standard
  • an IMT-2000 service is used, so that the quality of an existing voice and Wireless Application Protocol (WAP) service can be improved and various multimedia services, e.g., Audio On Demand (AOD), Video On Demand (VOD), etc., can be provided at higher speed.
  • WAP Wireless Application Protocol
  • Portable Internet lies between a WLAN and a wireless Internet based on mobile communication, and provides a service having the advantages of the WLAN and the wireless Internet. That is, the portable Internet provides a service in which users access the Internet by means of a portable wireless terminal at high transmission speed in a stationary state or a medium/low speed movement state regardless of time and place, so that it is possible to obtain or use various information and content.
  • the portable Internet corresponds to an Internet Protocol (IP) based wireless data system having an upload/download asynchronous transmission characteristic in which it provides low transmission speed as compared with the WLAN having an advantage in view of transmission speed, but it can ensure the mobility of a terminal, and it does not support high speed mobility of the wireless Internet having an advantage in view of mobility, but it can provide an Internet service at high transmission speed.
  • IP Internet Protocol
  • the portable Internet requires link adaptation in order to ensure a proper Carrier to Interference ratio (C/I) according to the position of a terminal, and its representative method is power control.
  • C/I Carrier to Interference ratio
  • the coverage is limited to the predetermined extent.
  • a terminal located far from a base station it is possible to allocate more power and ensure the same quality of service.
  • co-channel interference may occur in a neighbor cell using the same frequency. Therefore, it is necessary to perform power control in order to allocate minimum power necessary for ensuring quality of service.
  • a method which adaptively controls a transmission rate according to channel conditions, has been used for link adaptation in the portable Internet, instead of the power control.
  • a correlation function value among received signal amplitudes decreases as the speed of a terminal increases.
  • the correlation function value relatively_increases.
  • a Doppler frequency is 5 Hz
  • a correlation value is maintained within 0.8 for 20 ms, it may be regarded that channel conditions do not change over a plurality of frames. Accordingly, it is possible to adaptively apply a proper level of modulation and channel coding scheme according to given channel conditions. This will be referred to as an Adaptive Modulation and Coding (AMC) scheme.
  • AMC Adaptive Modulation and Coding
  • a packet data system such as portable Internet performs scheduling so that a user having good channel conditions can preferentially transmit data, thereby maximizing the total throughput of the system.
  • the resources are sequentially allocated according to the user priority determined by a scheduler. That is, the most proper band is allocated to a user having the highest priority, and then a proper band is sequentially allocated to a user having a subsequent priority when allocable resources exist. Since channel conditions of each user are theoretically independent, bands requested by each user are uniformly distributed throughout 24 bands, but there typically exists a specific band being commonly requested by multiple users.
  • an object of the present invention is to provide a method and a system for allocating an AMC subchannel in a portable Internet network using a PSS which transmits an SINR value, in which an RAS allocates a channel in order to exchange data with a PSS, computes the number of OFDM symbols required according to bands, compares the computed number of OFDM symbols with the number of symbols actually provided to the PSS, generates a list of user groups to which an AMC subchannel is to be redistributed, and efficiently distributes the AMC subchannel to the PSS.
  • a system for allocating an Adaptive Modulation and Coding (AMC) subchannel in a portable device for allocating an Adaptive Modulation and Coding (AMC) subchannel in a portable device.
  • AMC Adaptive Modulation and Coding
  • PSS Personal Subscriber Station
  • SINR System Information
  • the system including: the PSS for accessing the portable Internet network by means of an Orthogonal Frequency Division Multiple Access (OFDMA) scheme and using a portable Internet service; a Radio Access Station (RAS) for functioning as an Access Point (AP) of the PSS in the portable Internet system; an Access Control Router (ACR) for controlling multiple RASs; an Home Agent (HA) for transmitting packets from an external packet data service server and an Internet; a data service server for transmitting various content data in a form of a packet; an Authentication, Authorization and Accounting (AAA) server for authenticating network access of the PSS; a Network Management System (NMS) server for organizing a central monitoring system for equipments on a network, performing monitoring, planning, analysis, storing related data, and allowing the data to be immediately used if a situation requires; and an IP network for interconnecting the ACR, the HA, the AAA server and the NMS server.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • ACR
  • a Radio Access Station for allocating an Adaptive Modulation and Coding (AMC) subchannel in a portable Internet network using a Personal Subscriber Station (PSS) which transmits a Signal to Interference and Noise Ratio (SINR) value
  • the RAS including: a scheduler for determining a resource allocation sequence in which resources are allocated to the PSS; a resource allocator for mapping the resource allocation sequence to allocation bands based on the resource allocation sequence determined by the scheduler; and an OFDM transmitter for generating OFDM symbol signals and transmitting the OFDM symbol signals to an Access Control Router (ACR) or the PSS.
  • ACR Access Control Router
  • a method for allocating an Adaptive Modulation and Coding (AMC) subchannel in a portable Internet network using a Personal Subscriber Station (PSS) which transmits a Signal to Interference and Noise Ratio (SINR) value including the steps of: (a) allocating by a Radio Access Station (RAS) bands to the PSS in order to provide the PSS with data communication, and computing by the PSS SINR values of the allocated bands; (b) if the SINR values of bands selected by the PSS are computed, transmitting the SINR values to the RAS; (c) computing by the RAS N_sym k ' based on the SINR values received from the PSS; (d) computing by the RAS a total number N_total(k) of OFDM symbols, which is required for each band, by means of the computed N_sym k ' ; (e) defining by the RAS a number of OFDM symbols in a band having
  • FIG. 1 is a diagram illustrating the structure of an OFDMA frame in a portable Internet system according to a preferred embodiment of the present invention
  • FIG. 2 is a block diagram schematically illustrating the structure of a portable Internet system according to a preferred embodiment of the present invention
  • FIG. 3 is a block diagram schematically illustrating the structure of a RAS according to a preferred embodiment of the present invention
  • FIG. 4 is a flow diagram illustrating a method for allocating an AMC subchannel in a portable Internet network according to a preferred embodiment of the present invention.
  • FIG. 1 is a diagram illustrating the structure of an Orthogonal Frequency Division Multiple Access (hereinafter, referred to as OFDMA) frame in a portable Internet system according to a preferred embodiment of the present invention.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • a slot in a portable Internet standard is designated in a two dimensional space according to the number of symbols and the number of subcarriers on time and frequency domains, and the symbol is a minimum unit of allocation.
  • a slot is dependent on a scheme for actually forming a subchannel in an uplink 120 and a downlink 110.
  • An allocation scheme of a subcarrier in a portable Internet may be classified as a scheme for collecting scattered subcarriers by a permutation to form a diversity subchannel 140 and a scheme for collecting physically consecutive subcarriers according to bands to form an AMC subchannel 150.
  • a preamble 112 is allocated to the first symbol in the downlink 110, and the preamble 112 is used for frame synchronization and cell identification.
  • TTG 160 is interposed between the downlink 110 and the uplink 120, and a Receive/transmit/ Transition Gap (hereinafter, referred to as RTG) 170 is interposed between the end and beginning of a frame, so that it is possible to provide the maximum coverage of 1 km.
  • RTG Receive/transmit/ Transition Gap
  • a frame of 5 ms includes 42 OFDM symbols, the TTG 160 and the RTG 170.
  • the transmission of the downlink 110 is accomplished in a sequence of one preamble symbol, a Frame Control Header (hereinafter, referred to as FCH) , a DL-MAP and a data symbol .
  • FCH Frame Control Header
  • DL-MAP Data symbol
  • PUSC Partial Usage Subchannel
  • a PUSC employs a concept of separating subchannels and allocating different subchannels according to sectors, instead of using all subchannels in one sector, which is contrary to a Full Usage Subchannel (FUSC) employing a concept of using all subchannels in one sector.
  • FUSC Full Usage Subchannel
  • the first three symbols are used in order to transmit control information such as ranging and channel guality indicators.
  • the downlink frame includes three types of subchannels, i.e. the PUSC 130, the diversity subchannel 140 and the AMC subchannel 150.
  • the uplink frame includes two types of subchannels, i.e. the diversity subchannel 140 and the AMC subchannel 150.
  • the diversity subchannel 140 is scattered throughout the entire band to form a subcarrier, and changes its permutation by the symbol, so that it is possible to obtain diversity effect on a frequency domain.
  • one slot in the downlink 110 includes one subchannel and one OFDMA symbol
  • one slot in the uplink 120 includes one subchannel and three OFDMA .symbols .
  • the AMC subchannel 150 is formed by collecting consecutive subcarriers according to the bands. Accordingly, bands having good channel conditions are selected and allocated, so that it is possible to pursue the maximization of band efficiency.
  • one slot in the downlink 110 or the uplink 120 includes one subchannel and one OFDMA symbol.
  • the subchannel of the downlink 110 or the uplink 120 has a separate transmission interval including consecutive symbols, the PUSC 130 of the downlink 110 is defined throughout two symbols, and one PUSC 130 is comprised of four pilot subcarriers and 48 data subcarriers .
  • the diversity subchannel 140 of the downlink 110 is comprised of 48 subcarriers selected from available effective subcarriers in one symbol.
  • a basic allocation unit constituting the diversity subchannel 140 of the uplink 120 may use either a tile 142, which is formed by -collecting three adjacent subcarriers in three consecutive symbol intervals, or a tile 142 (including four pilot subcarriers) formed by collecting four adjacent subcarriers in three consecutive symbol intervals.
  • the diversity subchannel 140 of the uplink 120 is comprised of six tiles 142, and each of the tiles 142 is dispersed throughout the entire frequency band.
  • a basic unit constituting the AMC subchannel 150 of the downlink 110 and the uplink 120 is a bin 152.
  • the bin 152 is comprised of nine adjacent subcarriers in the same symbol.
  • the AMC subchannel interval of the downlink 110 and the uplink 120 has a plurality of bands, and four bins 152 exist in one band.
  • the AMC subchannel 150 of the downlink 110 and the uplink 120 is comprised of six adjacent bins 152 existing in the same band.
  • the pilot subcarrier has a position determined according to the positions of the bin 152 and the symbol .
  • An FCH is allocated to a subchannel in the first symbol next to the preamble 112 of each frame after the RTG 170.
  • the FCH is an area for transmitting a downlink frame prefix.
  • the downlink frame prefix transmits information relating to the current frame, including the length of a subsequent DL-MAP message, repetitive coding and channel coding schemes applied to a DL-MAP, etc.
  • the downlink frame prefix is comprised of 24 bits, and the 24 bits are repeated to form a 48-bit FEC block.
  • the downlink frame prefix is transmitted after passing through
  • FIG. 2 is a block diagram schematically illustrating the structure of the portable Internet system according to the preferred embodiment of the present invention.
  • the AMC subchannel allocation system includes a PSS 200, an RAS 210, an Access Control Router
  • ACR Home Agent
  • HA Home Agent
  • AAA Authentication, Authorization and Accounting
  • IP network 250 the Internet 260
  • data service server 270 a Network Management System (hereinafter, referred to as NMS) server 280, etc.
  • NMS Network Management System
  • the PSS 200 represents a mobile communication terminal for accessing the portable Internet network by means of an OFDMA scheme and using a portable Internet service.
  • the PSS 200 has a low power Radio Frequency (RF) /Intermediate Frequency (IF) module, and performs a Media Access control (MAC) frame variable control function according to service characteristics and radio wave conditions, a handoff function, a multicast service reception function, an interworking function with other networks, a user authentication and encryption function, etc. Further, the PSS 200 selects a band in order to transmit and receive data through the portable Internet network, measures an SINR value of the selected band, and transmits the measured SINR to the RAS 210.
  • RF Radio Frequency
  • IF Intermediate Frequency
  • MAC Media Access control
  • the RAS 210 corresponds to an Access Point (AP) of the portable Internet system, and functions as a data repeater for transmitting data, which are received from the ACR 220, to the PSS 200 in a wireless manner, or transmitting data, which are received from the PSS 200, to the ACR 220. Further, the RAS 210 performs a radio resource management and control function, a handoff support function, a downlink multicast function, accounting, a statistical information generation and notification function, and an authentication and security function. Furthermore, the RAS 210 is an apparatus for receiving an SINR value from the PSS 200.
  • AP Access Point
  • the ACR 220 accommodates multiple RASs 210, and performs a handoff control function among the RASs 210, an IP routing and handoff management function, a function for providing an accounting server with an accounting service, an IP multicast function, a resource management and control function, an authentication and security function, etc.
  • the HA 230 performs routing for transmitting packets from an external packet data service server including the Internet 260.
  • the AAA server 240 interworks with the RAS 210, performs accounting for packet data used by the PSS 200, and authenticates access from the PSS 200.
  • the IP network 250 interconnects the ACR 220, the HA 230, the AAA server 240, the NMS server 280, a downlink/uplink ratio setup server, etc., receives packet data from the external packet data service server including the Internet 260 and a data service server for providing various contents, and transmits the received data to the ACR 220.
  • the NMS server 280 organizes a central monitoring system for equipments on a network, performs monitoring, planning, analysis, etc., stores related data, and allows the data to be immediately used if the situation requires.
  • FIG. 3 is a block diagram schematically illustrating the structure of the RAS for allocating an AMC subchannel in the portable Internet network using the PSS for transmitting an SINR value according to the preferred embodiment of the present invention.
  • a scheduler 310 determines a resource allocation sequence, in which resources are allocated to the PSS 200, by means of the SINR value, which is transmitted from the PSS 200, and code packet size information, receives packet data from the PSS 200, and transmits the received packet data to an OFDM transmitter 330.
  • a resource allocator 320 receives the resource allocation sequence from the scheduler 310, maps the received resource allocation sequence to a predetermined band so that resources can be sequentially allocated to each PSS 200, and transmits band information obtained as a result of the mapping to the OFDM transmitter 330.
  • FIG. 4 is a flow diagram illustrating a method for allocating an AMC subchannel in the portable Internet network using the PSS for transmitting an SINR value according to the preferred embodiment of the present invention.
  • the PSS 200 selects four or five bands having good band conditions from the bands allocated by the RAS 210, and simultaneously computes SINR values of the selected bands (S400) . Then, the PSS 200 transmits the SINR values, which are obtained as a result of the computation, to the RAS 210 (402) .
  • the RAS 210 computes the number N_sym k ' of OFDM symbols, which is necessary when an k th band is used for an i th PSS 202, by means of the code packet size N EP (i) of data to be transmitted to the i th PSS 202, and an SINR value SINR (k) of the k th band, which is selected by the i th PSS 202, based on the SINR values received from the PSS 200 (S404) .
  • the RAS 210 computes the total number N_total(k) of OFDM symbols, which is required for each band, by means of equation 1 based on the computed number N_sym k ' of OFDM symbols (S406) .
  • M N_total(k) ⁇ N_sym k '
  • M represents the number of the PSSs 200 using the AMC subchannel.
  • the RAS 210 defines the number of OFDM symbols in a band having the largest N total(Jc) as N_max (S408).
  • the RAS 210 determines if the N_max is greater than the number N_band of OFDM symbols which can be actually used as the AMC subchannel (S410) .
  • the RAS 210 allocates desired bands to all PSSs 200 within a provided OFDM symbol (S412) .
  • the RAS 210 determines if there exist collision bands which overlap with bands requested by multiple PSSs 200 (S414) .
  • the RAS 210 releases the use of an AMC subchannel by a PSS using a band in which the N_max is greater than the N_band, and allocates the desired bands to all PSSs 200 within the provided OFDM symbol (S416) .
  • the RAS 210 arranges the collision bands in a sequence in which a larger N_total(k) precedes a smaller N_total(k) , and defines a band having the maximum value of the N_total(k) as k' (S418) .
  • each PSS 200 is referred to as a PSS h
  • the RAS 210 computes the number
  • N_sym k ' of allocation symbols according to bands of the PSS h, which is obtained when the band k/ is allocated to the PSS h, computes the total number N_total(k') of OFDM symbols, which is required for each band, by means of the N_sym k ', , and sets a group A of the PSS h, which satisfies the following expression (S420) .
  • the RAS 210 redistributes the resources of the band k' to each PSS h, and computes the N_total(h) , N_max and N_sym k ', of each PSS h (S422) .
  • the RAS 210 selects a PSS h which minimizes the N_max, and redistributes the AMC subchannel (S424) .
  • the RAS 210 updates a list of the collision bands (S426) . After the list of the collision bands is completely updated, the RAS 210 determines if the N_max is greater than the number N_band of OFDM symbols which can be actually used as the AMC subchannel (S428) .
  • the number of OFDM symbols for AMC subchannel intervals is reduced through resource redistribution, so that the number of diversity subchannel users increases and the amount of occupation data according to bands is similarly distributed. Consequently, it is possible to efficiently use resources and increase the total throughput of the system.

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  • Computer Networks & Wireless Communication (AREA)
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  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
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  • Computer Hardware Design (AREA)
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Abstract

L’invention concerne un système pour attribuer un sous-canal AMC dans un réseau Internet portable à l’aide d’un PSS qui transmet une valeur SINR, lequel comprend : le PSS pour accéder au réseau Internet portable au moyen d’un plan OFDMA et à l’aide d’un service Internet portable ; un RAS pour fonctionner comme un AP du PSS ; un ACR pour commander des RAS multiples ; un HA pour transmettre des paquets provenant d’un serveur externe de service de données par paquet et un Internet ; un serveur de service de données pour transmettre diverses données de contenus sous la forme d’un paquet ; un serveur AAA pour authentifier un accès au réseau du PSS ; un serveur NMS pour organiser un système de surveillance centralisé pour des équipements sur un réseau, effectuant la surveillance, la planification, l’analyse, le stockage de données liées et permettant aux données d’être utilisées immédiatement si une situation l’exige ; et un réseau IP pour interconnecter l’ACR, le HA, le serveur AAA et le serveur NMS.
PCT/KR2006/001223 2005-04-01 2006-04-03 Procede et systeme pour attribuer une modulation adaptative et coder un sous-canal pour une utilisation dans un reseau internet portable Ceased WO2006104371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050027636A KR100816441B1 (ko) 2005-04-01 2005-04-01 휴대 인터넷망에서 ａｍｃ 부채널 할당 방법 및 시스템
KR10-2005-0027636 2005-04-01

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AU2014353789B2 (en) * 2013-11-25 2017-10-19 Lg Electronics Inc. Method and device for transmitting uplink frame in wireless LAN
CN105940727B (zh) 2014-02-04 2019-11-01 Lg电子株式会社 在wlan中基于功率节省模式的操作方法和设备
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