WO2001026253A1 - Systeme de liaisons radio - Google Patents

Systeme de liaisons radio Download PDF

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Publication number
WO2001026253A1
WO2001026253A1 PCT/FI2000/000848 FI0000848W WO0126253A1 WO 2001026253 A1 WO2001026253 A1 WO 2001026253A1 FI 0000848 W FI0000848 W FI 0000848W WO 0126253 A1 WO0126253 A1 WO 0126253A1
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WO
WIPO (PCT)
Prior art keywords
terminals
group
access point
broadcast message
terminal
Prior art date
Application number
PCT/FI2000/000848
Other languages
English (en)
Inventor
Juha Pihlaja
Original Assignee
Nokia Corporation
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 Nokia Corporation filed Critical Nokia Corporation
Priority to AU74250/00A priority Critical patent/AU7425000A/en
Publication of WO2001026253A1 publication Critical patent/WO2001026253A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users

Definitions

  • the invention is directed to microwave radio link systems, especially to such systems as described in the preamble of claim 1.
  • the invention concerns point-to-multipoint (PMP) radio systems, in which the access points (AP) operate in full-duplex mode and tenriinals (Access Terminal, AT) operate in half-duplex mode.
  • FIG 1 illustrates the structure of such a system.
  • Figure 1 shows teiminals 10, an access point 20, and a telecommunications network 30.
  • AP access point
  • AT access terminal
  • Such systems are used to link base stations of a cellular telecommunications network to a central station 20, which is connected to rest of the telecommunications network 30.
  • Such systems are also often used for providing wireless local area networks (WLAN).
  • WLAN wireless local area networks
  • Such systems are also often used to provide connections between public networks and private business and residential customers.
  • Such systems use time division to separate signals of the te ⁇ ninals from each other, i.e. they are arranged to transmit at different times.
  • terminals typically operate in half-duplex mode, i.e. the terminals cannot transmit and receive at the same time.
  • the access points are typically capable of full-duplex operation.
  • the number of access points in a network is considerably lower than the number of terminals, whereby the requirements for low cost are not as stringent as in the case of temiinals and the structure of access points can be more complicated.
  • HIPERACCESS and HIPERLAN systems specified by the European Telecommunications Standards Institute.
  • the HIPERACCESS system is described in detail in the ETSI specification DTR/BRAN-010001 "Broadband Radio Access Networks (BRAN): Requirements and architectures for HIPERACCESS fixed networks”.
  • BRAN Broadband Radio Access Networks
  • each terminal has to listen to a broadcast message (BM) at regular intervals, once in a constant length frame.
  • BM broadcast message
  • Half-duplex terminals cannot send during that time even though the AP is always able to receive, since the AP operates in full duplex mode.
  • the uplink channel is idle during that time and radio interface capacity is wasted.
  • An object of the invention is to realize a PMP radio link system, which avoids the problems of prior art.
  • a further object of the invention is to realize a PMP radio link system, which is able to use the capacity of the radio interface better than systems according to prior art.
  • the objects are reached by arranging the terminals into two groups, arranging a first group of the two groups to listen during a first half of a time period, arranging the second group of the two groups to listen during the second half of the time period, and sending broadcast messages twice i.e. once during said first half of the time period and once during said second half of the time period.
  • the system according to the invention is characterized by that, which is specified in the characterizing part of the independent claim directed to a system.
  • the access point according to the invention is characterized by that, which is specified in the characterizing part of the independent claim directed to a access point.
  • the tem ⁇ ial according to the invention is characterized by that, which is specified in the characterizing part of the independent claim directed to a terminal.
  • the method according to the invention is characterized by that, which is specified in the characterizing part of the independent method claim.
  • the terminals are grouped into two groups.
  • a first group of the two groups is arranged to listen during a first half of a time period and a second group of the two groups is arranged to listen during the second half of the time period.
  • the broadcast messages are sent twice i.e. once during said first half of the time period and once during said second half of the time period, whereby all te ⁇ ninals are able to receive the broadcast messages, and half of the terminals are able to transmit at the time when the other half is receiving a broadcast message.
  • the broadcast messages transmitted by the access point comprise various control information, such as for example the identifier of the access point, identifier of the network operator, and identifier of the transmission sector.
  • the broadcast messages may also comprise other types of information such as information about an access time slot, during which new terminals may initiate communication with the access point.
  • the broadcast messages also indicate the reception periods of individual terminals. Consequently, the two broadcast messages have some parts in common, while teirninal-specific parts are naturally different in the two broadcast messages of a frame.
  • the access point specifies the transmission periods allocated for a terminal in an individual transmission to the terminal, along with other terminal specific control information and possibly payload data.
  • a terminal does not need to receive during other times as the broadcast message times and reception times indicated by the AP.
  • a terminal may transmit if transmission is allowed by the AP, or the te ⁇ rhnal may be in idle mode in order to save power.
  • Each terminal advances the granted time values by the double propagation delay given by AP, so that the transmission of the ter ⁇ hnal arrives at the access point at the indicated time, and conversely for reception.
  • Figure 1 illustrates a PMP system according to prior art
  • Figure 2 illustrates liming according to an advantageous embodiment of the invention.
  • FIG. 3 illustrates timing according to a further advantageous embodiment of the invention
  • Figure 2 illustrates the timing of listening and transmission times of various parties of a PMP system, i.e. the timing of a first group GROUP A, a second group GROUP B and an access point AP.
  • White rectangles denote listening times
  • hatched rectangles denote time when a party may transmit
  • dotted rectangles denote actual transmission.
  • Time T 0 denotes the beginning of a frame
  • time Ti denotes the end of that frame and the beginning of the second frame.
  • Time T denotes the middle of the frame.
  • terminals in the first group GROUP A listen during the time period T 0 to T 2 , and may transmit in the time period T 2 to Ti .
  • Terminals in the second group GROUP B may transmit during the time period T 0 to T 2 , and they listen in the time period T 2 to Ti .
  • the access point transmits a broadcast message during the interval between times T 3 and T , which are both between times T 0 and T 2 .
  • the terminals in the first group GROUP A receive the message during that time, while terminals in the second group GROUP B may transmit during that time.
  • terminals in the second group GROUP B begin to listen, and the access point transmits the second broadcast message during the interval between times T 5 and T 6 , which are both between times T 2 and Ti .
  • the terminals in the second group GROUP B receive the message during that time, while temiinals in the first group GROUP A may transmit during that time.
  • the broadcast messages are sent in the beginning of the frame and in the middle of the frame, i.e. times T 0 and T 3 are the same and T and T 5 are the same.
  • Figure 3 illustrates the timing of listening and transmission times of various parties of a PMP system, i.e. the timing of a first group GROUP A, a second group GROUP B and an access point AP.
  • White rectangles denote listening times
  • hatched rectangles denote time when a party may transmit
  • dotted rectangles denote actual transmission.
  • Time T 0 denotes the beginning of a frame
  • time Ti denotes the end of that frame and the beginning of the second frame.
  • the first broadcast message is transmitted during the interval between times T 3 and T 4
  • the second broadcast message during the interval between times T 5 and T 6 .
  • terminals in the first group GROUP A listen during the time period T 3 to T 4 , and may transmit during other times.
  • Terminals in the second group GROUP B listen during the time period T 5 and T 6 , and may transmit during other times.
  • the broadcast messages are sent in the beginning of the frame and in the middle of the frame, i.e. times T 0 and T 3 are the same and T 2 and T 5 are the same.
  • the two broadcast messages preferably comprise an identifier indicating which of the two broadcast messages a particular broadcast message is.
  • an identifier allows terminals to recognize if a particular broadcast message is directed to the group it belongs to or to the other group.
  • the identifier can be for example in the form of a bit pattern in the beginning of the broadcast message.
  • the grouping of terminals to two groups is performed without any signalling from the access point.
  • the grouping can advantageously be based on a device dependent parameter such as a device serial number or some other equipment identifier, more specifically on the value of the least significant bit of such an identifier.
  • the terminal therefore knows which group it belongs to without any explicit signalling from the access point. This arrangement ensures, that almost any set of terminals can be grouped into two groups of roughly equal size.
  • the access point can instruct one or more terminals to switch groups, if the sizes of the groups are too unequal.
  • Access point manages transmission timing of the terminals according to certain rules such that uplink capacity can be in full use.
  • certain rules such that uplink capacity can be in full use.
  • the access point grants permissions to terminals to send uplink data based on transmission requests it has received from the terminals.
  • the AP calculates and organizes the time slots so that each terminal does not need to receive downlink data and send uplink data simultaneously, thus allowing half-duplex operation for the temiinals.
  • the AP preferably takes into account the downlink propagation times from AP to each AT and uplink propagation times from each AT to the AP.
  • the access point (AP) allocates the total available frame periods in near future to terminals (AT) by calculating the amounts of time each tem ⁇ nal will be granted in downlink and uplink.
  • the access point (AP) knows how much transmission capacity each terminal needs, since the access point knows the connection types of the terminals. For obtaining this information for packet connections, the access point can periodically poll the terminals. Also, the terminals can indicate to the access point that they have data waiting to be transmitted. For example, the access point can periodically arrange a time slot for that purpose, during which any terminal having data waiting to be transmitted can send such an indication.
  • the scheduler After calculating the amounts of time needed by the terminals, the scheduler allocates exact time slots for the reception and transmission times of the terminals using a certain set of rules and trying to fulfill the amounts of time needed by the temiinals and the requirements of the rules in an as optimal way as possible.
  • One set of such rules according to an advantageous embodiment of the invention is described in the following. It is specifically noted here that the following is an example only, and other sets of mles for deterniining the transmission and reception times for the te ⁇ ninals could be used.
  • Terminals are ordered according to the distance i.e. the time delay of the terminal from the access point.
  • the transmission/reception time slot of the terminal of the first group (group A) which is closest to the access point is here denoted Ai, and that of the one furthest from the access point A n .
  • the transmission/reception time slots of terminals of the second group (group B) are denoted from Bj to B n according to the distance of the terminal from the access point.
  • the time delay of the terminals from the access point is known by the access point, since during the phase when a new terminal initiates communications with the access point, the access point adjusts the timing of the terminals so that the transmissions of the terminal arrive at the access point at the desired times. Therefore, both the access point and the terminal know the time delay caused by the propagation of the radio signal from the terminal to the access point or vice versa.
  • the broadcast message directed to terminals of the first group is denoted BM A in the following, and the broadcast message to terminals of the second group is denoted BM B .
  • the access point aims to transmit BM A in the beginning of the frame and BM B in the middle of the frame.
  • the position of BM B within a frame is not very critical. However, it is very advantageous if successive first broadcast messages BM A are repeated with a period of one frame period, and the second broadcast messages BM B as well with a period of one frame period, which allows the terminals to adjust exactly to their respective broadcast message timing without having to listen and wait for a broadcast message to occur.
  • the transmissions of the AP are organized as follows:
  • the first broadcast message BM A is transmitted first, followed by transmissions directed to individual terminals in group B, whereafter the second broadcast message BM B is transmitted, followed by transmissions directed to individual te ⁇ ninals in group A.
  • the transmissions of the AP are organized as follows:
  • the first broadcast message BM A is transmitted first, followed by transmissions directed to individual terminals in group B.
  • the second broadcast message BM B is transmitted in or as closely after the middle of the frame as possible, followed first by those transmissions to terminals in group B which did not fit in the frame between the two broadcast messages.
  • the frame is finished by transmissions directed to individual terminals in group A.
  • the transmissions of the AP are organized as follows:
  • the first broadcast message BM A is transmitted first, followed by transmissions directed to individual terminals in group B. After these, transmissions to terminals in group A are started, and the second broadcast message BM B is transmitted in or as closely after the middle of the frame as possible. The frame is finished by transmissions to those terminals in group A, whose transmissions did not fit in the first half of the frame.
  • the reception times for at least those terminals of the B group whose reception times are before the BM B of the cu ⁇ ent frame have been specified in the BM B of the previous frame, and preferably the reception times of the rest (if any) of B terminals as well.
  • the broadcast messages may specify reception and transmission times for a longer time span than one frame.
  • the previous schemes (1), (2) and (3) have the advantage, that a terminal does not need to receive directly after reception of a broadcast message informing the terminal about its reception time. Without such an a ⁇ angement, an idle period may need to be used after a broadcast message, since the interpretation of the contents of a broadcast frame does not happen instantaneously due to the processing time needed to decode a broadcast message, which are typically encoded in various ways in order to enable e ⁇ or co ⁇ ection.
  • the terminal to which the transmission after a broadcast message is directed is able to receive the transmission, since the broadcast message is directed to terminals of the other group.
  • terminal Bi is able to receive data at once, since that terminal is not busy decoding BM A .
  • the access point takes into account a guard period, which is required between the reception and transmission periods of a terminal in order to allow the terminal to change between transmission and reception operating modes.
  • the access point adjusts the transmission and reception times so that none of the terminals is required to send within the guard period after or before a reception period of the particular terminal.
  • the closest terminal of group A is allowed to send after the guard period after the end BM A , whereafter transmission periods are granted to other terminals in group A in order of distance, i.e. the second closest terminal next and so on. After the A terminals, transmission periods are granted to terminals in group B similarly in order of distance.
  • a system for providing wireless point-to-multipoint connections comprises an access point using full-duplex mode and terminals using half-duplex mode.
  • Said system comprises an access point using full-duplex mode and terminals using half-duplex mode.
  • each of a plurality of the temiinals has an equipment identifier
  • each of said plurality of the terminals is a ⁇ anged to classify itself as belonging to a first group of terminals or a second group of terminals based on said equipment identifier according to a predefined rule;
  • the access point is a ⁇ anged to send a first broadcast message to said first group of terminals and a second broadcast message to said second group of terminals
  • the access point is a ⁇ anged to schedule the transmission period of at least one terminal of said second group to overlap at least partly with the transmission period of said first broadcast message.
  • said system preferably comprises means for classifying said terminals in said terminals, means in the access point for sending a first broadcast message and a second broadcast message to a first group of te ⁇ ninals and to a second group of terminals respectively, and means in the access point for scheduling transmission periods of terminals.
  • Said means for classifying, sending and scheduling can advantageously be implemented using processors executing software program elements stored in a memory means in the particular system element.
  • the access point is a ⁇ anged to schedule the transmission period of at least one terminal of said first group to overlap at least partly with the transmission period of said second broadcast message.
  • an access point of a point-to-multipoint wireless link system is provided.
  • the access point is arranged to send a first broadcast message in a frame to a first group of terminals and a second broadcast message in said frame to a second group of terminals, and the access point is arranged to schedule the transmission period of at least one terminal of said second group to overlap at least partly with the transmission period of said first broadcast message.
  • the access point preferably comprises means for sending a first broadcast message and a second broadcast message to a first group of terminals and to a second group of terminals respectively; and means for scheduling transmission periods of terminals.
  • Said means for sending and scheduling can advantageously be implemented using a processor of the access point executing software program elements stored in a memory means in the access point.
  • a method for providing wireless point-to-multipoint connections between an access point and a plurality of terminals is provided.
  • the terminals are grouped into a first group and a second group, during a transmission frame, the access point sends a first broadcast message to terminals in the first group and a second broadcast message to terminals in the second group, and at least one of the terminals of the second group is scheduled to transmit during at least a part of the transmission period of said first broadcast message.
  • at least one of the terminals of the first group is scheduled to transmit during at least a part of the transmission period of said second broadcast message.
  • the invention has several advantages.
  • the invention allows the elimination of idle time in the uplink direction during broadcast message transmissions in the downlink direction.
  • the invention has been described in the following as applied in the HIPERACCESS and HIPERLAN systems, but the mvention is not limited to application in those systems.
  • the invention can be used in any other PMP radio link systems, where a central station using full-duplex mode communicates with slave stations using half- duplex mode.

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

Abstract

Dans le domaine des systèmes de liaisons radio hyperfréquence, l'invention concerne un système radio point à multipoint (PMP) dont les points d'accès (AP) opèrent en duplex intégral et les terminaux d'accès (AT) en semi-duplex. L'invention consiste à répartir les terminaux en deux groupes. Le premier groupe est organisé pour être à l'écoute pendant la première moitié d'une période de temps, et le second groupe pendant la deuxième moitié. Les messages diffusés sont envoyés deux fois: une fois pendant la première moitié de la période de temps, et une deuxième fois pendant la deuxième moitié. Ainsi, tous les terminaux sont capables de recevoir les messages diffusés, une moitié des terminaux étant à même d'émettre pendant que l'autre moitié est en réception d'un message diffusé.
PCT/FI2000/000848 1999-10-01 2000-10-02 Systeme de liaisons radio WO2001026253A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74250/00A AU7425000A (en) 1999-10-01 2000-10-02 A radio link system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI19992125 1999-10-01
FI992125 1999-10-01

Publications (1)

Publication Number Publication Date
WO2001026253A1 true WO2001026253A1 (fr) 2001-04-12

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PCT/FI2000/000848 WO2001026253A1 (fr) 1999-10-01 2000-10-02 Systeme de liaisons radio

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AU (1) AU7425000A (fr)
WO (1) WO2001026253A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002005491A1 (fr) * 2000-07-07 2002-01-17 Telefonaktiebolaget Lm Ericsson Unite centrale assurant un controle centralise et distribue dans un systeme de reseau local (rl) partage
CN101534541B (zh) * 2003-12-26 2011-03-23 株式会社Ntt都科摩 移动通信系统、无线控制装置和基站
EP2858398A4 (fr) * 2012-05-31 2015-06-17 Huawei Tech Co Ltd Procédé de communication sans fil, station de base et équipement utilisateur
WO2016187208A1 (fr) * 2015-05-19 2016-11-24 Qualcomm Incorporated Procédure de planification améliorée pour point d'accès en duplex intégral

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979723A (en) * 1975-10-29 1976-09-07 International Business Machines Corporation Digital data communication network and control system therefor
US5327580A (en) * 1990-10-12 1994-07-05 Ericsson Ge Mobile Communications Inc. Full duplex RF repeater/base station providing microprocessor-controlled simultaneous CTCSS tone encode/decode
US5506837A (en) * 1993-02-11 1996-04-09 U.S. Philips Corporation Cellular radio communication system which is selectively convertible into a trunked radio communication system for group calls
US5617412A (en) * 1994-04-15 1997-04-01 Alcatel N.V. Frame/multiframe structure FDMA system and corresponding signal
WO1999026437A1 (fr) * 1997-11-14 1999-05-27 Ericsson Inc. Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications
WO2000054434A1 (fr) * 1999-03-05 2000-09-14 Nokia Networks Oy Procede de transmission de donnees et systeme de liaison radio

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979723A (en) * 1975-10-29 1976-09-07 International Business Machines Corporation Digital data communication network and control system therefor
US5327580A (en) * 1990-10-12 1994-07-05 Ericsson Ge Mobile Communications Inc. Full duplex RF repeater/base station providing microprocessor-controlled simultaneous CTCSS tone encode/decode
US5506837A (en) * 1993-02-11 1996-04-09 U.S. Philips Corporation Cellular radio communication system which is selectively convertible into a trunked radio communication system for group calls
US5617412A (en) * 1994-04-15 1997-04-01 Alcatel N.V. Frame/multiframe structure FDMA system and corresponding signal
WO1999026437A1 (fr) * 1997-11-14 1999-05-27 Ericsson Inc. Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications
WO2000054434A1 (fr) * 1999-03-05 2000-09-14 Nokia Networks Oy Procede de transmission de donnees et systeme de liaison radio

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002005491A1 (fr) * 2000-07-07 2002-01-17 Telefonaktiebolaget Lm Ericsson Unite centrale assurant un controle centralise et distribue dans un systeme de reseau local (rl) partage
CN101534541B (zh) * 2003-12-26 2011-03-23 株式会社Ntt都科摩 移动通信系统、无线控制装置和基站
EP2858398A4 (fr) * 2012-05-31 2015-06-17 Huawei Tech Co Ltd Procédé de communication sans fil, station de base et équipement utilisateur
WO2016187208A1 (fr) * 2015-05-19 2016-11-24 Qualcomm Incorporated Procédure de planification améliorée pour point d'accès en duplex intégral
US9647823B2 (en) 2015-05-19 2017-05-09 Qualcomm Incorporated Enhanced scheduling procedure for full duplex access point
CN107624228A (zh) * 2015-05-19 2018-01-23 高通股份有限公司 用于全双工接入点的增强型调度规程

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