WO2003107702A1 - Procede d'attribution de canaux pour une transmission de donnees utiles par l'intermediaire d'une interface radio entre une station radio emettrice et une station radio receptrice - Google Patents

Procede d'attribution de canaux pour une transmission de donnees utiles par l'intermediaire d'une interface radio entre une station radio emettrice et une station radio receptrice Download PDF

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Publication number
WO2003107702A1
WO2003107702A1 PCT/EP2003/006070 EP0306070W WO03107702A1 WO 2003107702 A1 WO2003107702 A1 WO 2003107702A1 EP 0306070 W EP0306070 W EP 0306070W WO 03107702 A1 WO03107702 A1 WO 03107702A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
carrier
assigned
connection
frequency hopping
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2003/006070
Other languages
German (de)
English (en)
Inventor
Carsten Ball
Kolio Ivanov
Robert Müllner
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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
Priority claimed from DE2002126648 external-priority patent/DE10226648A1/de
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2003107702A1 publication Critical patent/WO2003107702A1/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
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/12—Fixed resource partitioning
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • 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

Definitions

  • Radio communication systems are used to transmit information, voice or data using electromagnetic waves via a radio interface, also known as an air interface, between a transmitting and a receiving one
  • Radio station An example of a radio communication system is the known GSM mobile radio system and its further development with a packet data service GPRS or EGPRS, the architecture of which is described, for example, in B. Walke, "Mobile radio networks and their protocols", Volume 1, Teubner-Verlag Stuttgart, 1998, page 138 to 151 and pages 295 to 311.
  • GPRS Packet Control Protocol
  • EGPRS Packet Control Protocol
  • a channel formed by a narrow-band frequency range and a time slot is provided for the transmission of a subscriber signal. Since a subscriber signal in one channel differs in frequency and time from the other subscriber signals, the radio station can detect the data of the subscriber signal.
  • the individual subscribers are also differentiated by different spreading codes.
  • a packet data flow (Temporary Block Flow TBF) is broken down into time-limited radio blocks that are transmitted. Depending on the modulation / coding a set, these radio blocks have different payloads with the same length.
  • the possible modulation / coding schemes differ with regard to the division of the radio block into payload and error protection information.
  • a coding scheme with higher or lower error protection is assigned to a connection. In the case of poor radio conditions, a coding scheme with higher error protection is assigned, and in good radio conditions a coding scheme with less error protection.
  • the time-limited radio blocks from different users or the time-limited packet data flows from different users are transmitted over the channel in a nested manner.
  • the quality of the channel is determined for the individual participant on the basis of measured values.
  • the received field strength, the block error rate, the interference level of the channel and the bit error probability serve as measured values.
  • the measured values are used to set various radio parameters.
  • the modulation / coding scheme is dynamically adapted to the channel conditions on the basis of the measured values. In this way, the participant receives the error protection that he needs based on the radio conditions. This is generally associated with a changing data rate, which can be compensated for, for example, by reallocating the assigned channels.
  • packet-switched data transmission today mainly takes place via the broadcast channel (broadcast channel BCCH carrier), which is radiated continuously by all base stations in all time slots with constant power.
  • BCCH carrier broadcast channel
  • Operators are increasingly moving to allocating packet data channels to non-BCCH carriers, which usually have a different frequency reuse pattern and a different frequency hopping method.
  • In the packet data channels must be reserved channels between f o r GPRS / EDGE, which differ approval sen no circuit-switched speech and mixed channels for GPRS / EDGE and language.
  • the invention is based on the problem of specifying a method for channel allocation in a user data transmission via a radio interface between a transmitting radio station and a receiving radio station, with which the capacity of the radio interface can be better utilized.
  • a subscriber connection is assigned a channel on a carrier, which is selected from a set of at least two carriers that are planned with different frequency repetition patterns and / or have different frequency hopping systems. Frequency hopping with different frequencies is used in the different frequency hopping systems. This also includes the case of frequency hopping with zero frequencies, i.e. H. no frequency hopping method.
  • the carrier is selected from a set of at least two carriers, of which one carrier provides a frequency hopping method and the other carrier does not provide a frequency hopping method or another frequency hopping method.
  • the frequency repetition pattern of the carriers is also taken into account.
  • the channel on the carrier on which an optimal data rate is achieved under given radio conditions is assigned to the subscriber connection. The method therefore optimizes a subscriber's data throughput.
  • the method is suitable for the transmission of user data of packet data as well as of voice data.
  • more than one channel can be assigned to a connection, the method then being applied to the selection of all channels.
  • the invention makes use of the knowledge that different coding schemes used in packet data transmission and with some voice data transmissions, eg when using adaptive multirate codecs, behave differently with regard to the achievable data rate depending on whether they are assigned to a connection on a carrier with frequency hopping or a connection on a carrier without
  • Frequency hopping Furthermore, the achievable data rate depends on the frequency repetition pattern used. This effect is exploited by assigning a connection to one or more channels on the carrier on which the optimal data rate is achieved under the given boundary conditions.
  • the data rate achieved is higher if the connection is assigned a channel on a carrier with frequency hopping than if the same connection was assigned a channel on a Carrier without frequency hopping is assigned.
  • a coding scheme with a low level of error protection e.g. CS3 or CS4 for GPRS or M-CS4 to M-CS9 for EGPRS the data rate is higher when the connection is assigned a channel on a carrier without frequency hopping than when the same connection is assigned a channel on a carrier with frequency hopping.
  • the invention also makes use of the knowledge that, with a high system load (high fractional load), the C / I distribution in the cell is better planned for a carrier with a large frequency repetition interval than for a carrier with a small frequency repetition interval. Therefore meet connections with coding scheme. With a high level of error protection, the requirements placed on them will probably still be satisfactory on carriers with a small frequency repetition distance, while uncoded or almost uncoded connections only run reasonably on carriers with a large frequency repetition distance.
  • the BCCH carrier in particular is planned with a sufficiently large frequency repetition interval.
  • the fulfillment of the requirements on non-BCCH carriers is better than on BCCH carriers, since the BCCH carriers always emit with constant output power and thus generate interference.
  • the interference on a non BCCH carrier with the same frequency repetition distance is therefore drastically less.
  • the packet data connections should therefore preferably be allocated to non-BCCH carriers.
  • the allocation of the available channel resources to a new or running packet data connection also depends on the current occupancy of the resources by other packet data flows, since multiplexing can drastically reduce the throughput of a connection.
  • the number of available time slots for a multislot mobile also plays a role.
  • a channel on a carrier with frequency hopping is preferably assigned to a subscriber connection to which a coding scheme with a high level of error protection is assigned on the basis of the radio conditions.
  • a carrier is preferred that has been planned with a small frequency repetition distance.
  • a subscriber connection that is assigned a coding scheme with a low level of error protection on the basis of the radio conditions is assigned a channel on a carrier without frequency hopping, preferably on a carrier that generally has a large frequency repetition distance, such as the BCCH carrier.
  • connection is thus always assigned a channel in which the highest possible data rate can be achieved. In this way, the capacity of the radio interface is better used. If participants with low data rates (due to the coding scheme with high error protection) are kept away from the channels with maximum throughput, then these are only available to participants with high data rates. Losses occur with this little, since the participants with small data rates due to the phy ⁇ sik on their assigned channels with the requirements even better meet than on channels with maximum throughput.
  • connection it is within the scope of the connection to measure a reception field strength, a ratio of useful to interference signal (C / I) and / or a time reserve at the start of a connection. Taking into account the measured values, the coding scheme and the channel to be assigned for the connection are then determined.
  • C / I useful to interference signal ratio
  • BET bit error rate
  • BLER block error rate
  • TA time reserve
  • the measured values are then used to determine the coding scheme and the channel or channels with which a maximum data rate is achieved, the different data rates being taken into account when assigning a channel on a carrier with frequency hopping and a carrier without or other frequency hopping. It may be necessary to change the channel from a carrier with frequency hopping to a carrier without or another frequency hopping method or vice versa when adapting the coding scheme. The same applies to frequency repetition pattern planning of the carrier.
  • the packet data channels with a small load preferably on a non BCCH carrier with frequency hopping and possibly a small frequency repetition distance and the packet data channels with a large load on a carrier without frequency hopping and a large frequency repetition distance such as to configure on the BCCH broadcast channel.
  • the connection is preferably assigned a coding method with high error protection and a channel on a carrier with frequency hopping for a useful to interference signal ratio between 6 and 15 dB.
  • FIG. 1 shows the data rate as a function of the useful data-to-interference signal ratio for two coding schemes with little error protection for transmission on a carrier with frequency hopping or a carrier without frequency hopping.
  • FIG. 2 shows the data rate m as a function of the useful data-to-interference signal ratio for two coding schemes with high error protection for transmission on a carrier with frequency hopping or without frequency hopping.
  • FIG. 3 shows a useful data to interference signal ratio distribution for an effective frequency repetition factor of 12.
  • FIG. 4 shows a useful data-to-interference signal ratio distribution for a frequency repetition factor of 1.
  • a field strength, a ratio of useful data to interference signal (C / I) and a time reserve (timing advance TA) are measured.
  • a coding scheme is defined that is assigned to the connection. This is done, for example, using a table.
  • the table is structured in such a way that it specifies the coding scheme for the respective radio conditions with which the highest data rate can be achieved.
  • GPRS is one of the coding schemes CS1, CS2, CS3 or CS4.
  • EGPRS is one of the coding schemes MCS1, MCS2, MCS3, MCS4, MCS5, MCS6, MCS7, MCS8 or MCS9.
  • the coding schemes CS1 to CS4 or MCS1 to MCS4 are used with the GMSK modulation, the coding schemes MCS5 to MCS9 with the 8PSK modulation.
  • the coding schemes have different error protection, which is caused by redundancy bits for error detection and error correction.
  • the coding schemes CS1 and MCS1 have the highest error protection, the coding schemes CS4 and MCS9 the lowest error protection or are even uncoded.
  • the relationship between information and redundancy bits shifts from CS1 to CS4 or MCS1 to MCS9 in favor of the information bits. This makes the transmission more error-prone. It is therefore sensible to use the coding schemes CS4 or MCS9 in good radio conditions and the coding schemes CS1 or MCS1 in bad radio conditions.
  • the connection is assigned, for example, a channel on a broadcast channel BCCH that continuously transmits on the same frequency with the coding scheme CS4, which has little error protection (see Point I in Figure 1).
  • the data rate 4 for the coding scheme CS4 is highest on a carrier without frequency hopping in the range above approximately 9 dB.
  • the useful data to interference signal ratio C / I, the bit error rate BER, the block error rate BLER and the time reserve TA are measured continuously, that is periodically at specific times.
  • the coding scheme and the channel with which a maximum data rate is achieved is determined. This is done, for example, on the basis of a table which, for the given measured values, indicates for which coding scheme on which channel the maximum data rate is achieved.
  • the table takes into account that when assigning a channel on a carrier with frequency hopping and on a carrier without frequency hopping, different data rates are achieved.
  • the connection in point II is assigned the coding scheme CS3 on the broadcasting channel BCCH, which transmits continuously without frequency hopping (see point III in FIG.
  • point IV is reached, at which the useful data to interference signal ratio C / I is 12.5 dB.
  • the maximum data rate 2 for the coding scheme CS2 is reached on a carrier with frequency hopping (see FIG.
  • the data rates are a function of the useful data to inference signal ratio C / I for the coding scheme CS2 on a carrier without frequency hopping (reference symbol 2), for the coding scheme CS2 on a carrier with frequency hopping method (reference symbol 2 '), for the coding scheme CS1 on a carrier without frequency hopping method (reference symbol 1) and for the coding scheme CSl on a carrier with frequency hopping method (reference symbol IM shown.
  • the assignment of the coding scheme CS2 is associated with the simultaneous assignment of another carrier using frequency hopping, for example a traffic channel TCH.
  • FIG. 3 shows the value CDF (1) as a function of the useful data to interference signal ratio C / I for a cell with a frequency repetition pattern 4x3 at 100% load.
  • the value CDF (1) in FIG. 4 is a function of the useful data to interference signal ratio C / I
  • CDF (1) means “Cumulative Distribution Function *” and describes the integral distribution of the C / I ratios in the cell for the wearer with the respective frequency repetition pattern.
  • FIGS. 3 and 4 show that the probability that the useful data to interference signal ratio is higher is greater with a frequency repetition pattern 4x3 even at 1001 load than with the carrier with 1/1 frequency repetition pattern at 30% load.
  • the radio conditions are statistically better.
  • the carrier with 4x3 frequency repetition patterns has for the most part C / I ratios which allow the operation of the uncoded GPRS CS4 or EDGE MCS9 codings.
  • the carrier with 1/1 frequency repetition pattern on the other hand, will only allow small coding schemes such as CS1 / 2 or MCS1 / 2 at 301 load.
  • the above algorithm includes both the consideration of the current system load and the consideration of the frequency repetition pattern per carrier.
  • the above method can be generalized from packet data to voice data.
  • adaptive multirate codecs AMR
  • AMR adaptive multirate codecs
  • wideband AMR in accordance with 3GPP Release 5 Standard
  • speech codecs based on 8PSK modulation are introduced, which offer optimal quality, but also only operate satisfactorily under very good radio channel conditions (large C / I).
  • an attempt must be made to use clever resource management or an optimal time slot allocation

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

Abstract

Selon la présente invention, un ou plusieurs canaux sur une porteuse sélectionnée parmi au moins deux porteuses sont attribués à une connexion d'abonné, lesquelles porteuses ont un modèle de réutilisation de fréquence différent et/ou présentent divers systèmes à saut de fréquences. Un ou plusieurs canaux sur la porteuse sur laquelle un débit binaire optimal est atteint dans des conditions radio données, en particulier avec prise en compte de l'occupation momentanée par d'autres connexions de données par paquets et prise en compte de la charge totale du système, sont attribués à cette connexion d'abonné.
PCT/EP2003/006070 2002-06-14 2003-06-10 Procede d'attribution de canaux pour une transmission de donnees utiles par l'intermediaire d'une interface radio entre une station radio emettrice et une station radio receptrice Ceased WO2003107702A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10226648.4 2002-06-14
EP02013161.1 2002-06-14
EP02013161 2002-06-14
DE2002126648 DE10226648A1 (de) 2002-06-14 2002-06-14 Verfahren zur Kanalzuweisung bei einer Nutzdatenübertragung über eine Funkschnittstelle zwischen einer sendenden und einer empfangenden Funkstation

Publications (1)

Publication Number Publication Date
WO2003107702A1 true WO2003107702A1 (fr) 2003-12-24

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PCT/EP2003/006070 Ceased WO2003107702A1 (fr) 2002-06-14 2003-06-10 Procede d'attribution de canaux pour une transmission de donnees utiles par l'intermediaire d'une interface radio entre une station radio emettrice et une station radio receptrice

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011060693A1 (fr) * 2009-11-18 2011-05-26 华为技术有限公司 Procédé et dispositif d'acquisition d'affaiblissement de propagation
CN103582106A (zh) * 2012-07-23 2014-02-12 京信通信系统（中国）有限公司 基于双载波跳频技术的信号处理方法、装置及塔顶放大器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996007284A1 (fr) * 1994-08-31 1996-03-07 Telstra Corporation Limited Systeme et reseau cellulaire de telecommunications
FR2768584A1 (fr) * 1997-09-12 1999-03-19 Nortel Matra Cellular Dispositif d'allocations de ressources dans un reseau de radiocommunications
WO2001026236A1 (fr) * 1999-10-01 2001-04-12 Telefonaktiebolaget Lm Ericsson (Publ) Methode et installations de systemes radio mobiles avec possibilite de commutation de schemas de codage canal
EP1137215A1 (fr) * 2000-03-24 2001-09-26 Motorola, Inc. Optimisation de débit dans un système de communication cellulaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996007284A1 (fr) * 1994-08-31 1996-03-07 Telstra Corporation Limited Systeme et reseau cellulaire de telecommunications
FR2768584A1 (fr) * 1997-09-12 1999-03-19 Nortel Matra Cellular Dispositif d'allocations de ressources dans un reseau de radiocommunications
WO2001026236A1 (fr) * 1999-10-01 2001-04-12 Telefonaktiebolaget Lm Ericsson (Publ) Methode et installations de systemes radio mobiles avec possibilite de commutation de schemas de codage canal
EP1137215A1 (fr) * 2000-03-24 2001-09-26 Motorola, Inc. Optimisation de débit dans un système de communication cellulaire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011060693A1 (fr) * 2009-11-18 2011-05-26 华为技术有限公司 Procédé et dispositif d'acquisition d'affaiblissement de propagation
CN103582106A (zh) * 2012-07-23 2014-02-12 京信通信系统（中国）有限公司 基于双载波跳频技术的信号处理方法、装置及塔顶放大器
CN103582106B (zh) * 2012-07-23 2017-02-08 京信通信系统（中国）有限公司 基于双载波跳频技术的信号处理方法、装置及塔顶放大器

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