EP2104984A1 - Procédé et dispositif pour une performance améliorée dans un système duplex par répartition dans le temps à accès sans fil - Google Patents

Procédé et dispositif pour une performance améliorée dans un système duplex par répartition dans le temps à accès sans fil

Info

Publication number
EP2104984A1
EP2104984A1 EP07701159A EP07701159A EP2104984A1 EP 2104984 A1 EP2104984 A1 EP 2104984A1 EP 07701159 A EP07701159 A EP 07701159A EP 07701159 A EP07701159 A EP 07701159A EP 2104984 A1 EP2104984 A1 EP 2104984A1
Authority
EP
European Patent Office
Prior art keywords
base station
user terminal
interval
characteristic
scheduling
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
EP07701159A
Other languages
German (de)
English (en)
Other versions
EP2104984A4 (fr
Inventor
Tobias Tynderfeldt
David Astely
Hannes Ekström
Erik Westerberg
Alireza Nejatian
Per Skillermark
Jacobus Haartsen
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP2104984A1 publication Critical patent/EP2104984A1/fr
Publication of EP2104984A4 publication Critical patent/EP2104984A4/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • a method and a device for enhanced performance in a wireless access TDD system are described.
  • the present invention relates to a method for use in a wireless access system which comprises at least one cell and at least one base station for the control of traffic to and from the cell.
  • the cell is able to accommodate at least a first user terminal, and in the system in question the first user terminal can be scheduled for receiving traffic from said base station during a first time interval, the down link interval, and for transmitting traffic to the base station during a second time interval, the up link interval.
  • the invention also relates to a radio base station for use according to the principles of the method of the invention, and to a corresponding user terminal.
  • LTE Long Term Evolution
  • 3GPP also called E-UTRA
  • E-UTRA Long Term Evolution
  • LTE Long Term Evolution
  • the connection from a base station to the user equipment, the downlink is separated in time from the connection from the user terminal to the base station, the uplink.
  • the up link and the down link transmit on the same frequency.
  • a base station transmits to user terminals in the cell of that base station, and during up link time periods, the user terminals in the cell transmit to the base station of the cell.
  • the base station cannot transmit and receive at the same time, and it is therefore necessary for the signals transmitted from different user terminals to arrive at approximately the same time.
  • the time alignment can be achieved by measuring the timing of signals received from the different user terminals in the cell. Due to different propagation delays over the air, the time alignment requirement means that a signal transmitted from a user terminal at the cell edge needs to be transmitted earlier than a signal transmitted from a user terminal close to the base station.
  • the signals transmitted in down link from the base station arrive later at the cell edge user terminals than at the user terminals close to the base station. Together, this gives the cell edge user terminals less time to switch from receive to transmit mode.
  • guard times also called idle periods or guard periods
  • the guard time at the switch from down link to up link should account for the round trip propagation delay plus the minimum switching time from receive to transmit mode in the user terminal. As explained above, the guard time will thus be dimensioned for the cell edge user terminal.
  • the required guard time at the switch from down link to up link depends mainly on the round trip delay, which will usually be proportional to the cell size.
  • the round trip delay will be fairly small, and in these cases, the switching time from receive to transmit mode in the user terminal will tend to dominate the guard time needed.
  • the round trip delay will dominate the guard time.
  • the round trip delay alone is 1 ms.
  • the round trip delay With one switch from down link to up link every 5 or 10 ms, which is the case for some systems, such as, for example some of the WiMAX profiles of IEEE 802.16e, and probably also LTE, a round trip delay of 1 ms will lead to a significant overhead. With a down link to up link switch every 5 ms, the overhead from the guard time will exceed 20% of the total.
  • the first user terminal can be scheduled for receiving traffic from the base station during a first time interval, the down link interval, and for transmitting traffic to the base station during a second time interval, the up link interval.
  • a guard period There is a third interval between the down link interval and the up link interval, a "guard period".
  • the method comprises the step of obtaining a certain characteristic of said first user terminal with respect to the third time interval, the guard period, and also comprises the step of making the scheduling in at least one of the up or down link intervals based upon the obtained characteristic of the first user terminal.
  • a user terminal can be scheduled in the up link or in the down link periods according to a certain characteristic of the user terminal, or, as an alternative, the characteristic for the user terminal which is obtained can be used to schedule the user terminal in both the up link and the down link periods.
  • the characteristic of the user terminal which is obtained is the terminal's distance from the base station. In another preferred embodiment, it is the round trip propagation delay of traffic between the first user terminal and the base station which is obtained and used to schedule the first user terminal in one or both of the up link/down link intervals.
  • the invention also discloses a radio base station which basically functions according to the method of the invention, and a corresponding user terminal.
  • FIG. 1 shows a schematic overview of a system in which the invention can be applied
  • Fig 2 shows a principle used in present systems
  • Fig 3 serves to illustrate a problem addressed by the invention
  • Figs 4 and 5 show different embodiments of the invention
  • Fig 6 shows another problem addressed by the invention
  • Fig 7 shows a flow chart of a method of the invention
  • Fig 8 shows a block diagram of a radio base station of the invention.
  • Fig 1 shows an example of a system 100 in which the invention may be applied.
  • the system 100 is a wireless access system, and as such comprises a number of cells, one of which is shown in fig 1 with the reference number 110.
  • the cell 110 comprises at least one radio base station, an RBS, shown as 120 in fig 1.
  • the RBS 120 serves, inter alia, to control the traffic to and from users in the cell 110.
  • the cell 110 can accommodate at least one user, and in fig 1 there are two user terminals shown, with the reference numbers 130 and 140.
  • the user terminals will be referred to below as UEs.
  • UE User Terminal
  • UT User Terminal
  • the UEs 130, 140 are shown as cellular telephones in fig 1 as well as in the other figures, it should be realized that this is merely to facilitate the understanding of the invention, the UEs may be many other kinds of devices, such as, for example, computers.
  • the system 100 for which the invention is intended is one in which communication to the UEs 130, 140, from the RBS 120 can be scheduled to take place during a first interval in time, usually referred to as the down link interval, DL, and the traffic from the UEs 130, 140, to the RBS 110 can be scheduled to take place during a second interval in time, the up link interval, UL.
  • DL and UL are separated in time, so that they do not coincide with each other.
  • a scheduler in the RBS 120 controls when the different UEs in the cell are allowed to transmit and receive data.
  • the time unit that a scheduler works with will in the following be referred to as Transmission Time Interval (TTI).
  • TTI Transmission Time Interval
  • the invention is especially suitable for a so called TDD system, in which the UL and the DL transmit on the same frequency but are divided in time. This principle is shown in fig 2, in order to illustrate a problem which the invention attempts to alleviate.
  • a so called guard time (also sometimes referred to as an idle period) is inserted, in order to account for a number of factors which occur at such a switch.
  • the DL periods are shown with an arrow from the RBS 120 indicated at the edge of the upper frames towards the UEs 130, 140, indicated at the lower frames, and the UL periods are indicated with an arrow in the other direction.
  • the DL periods are shown with an arrow pointing downwards, whereas the UL periods are indicated with a arrow pointing upwards.
  • Fig 2 illustrates the different "arrival times" of traffic from the RBS to the UEs 130, 140, by means of arrows with dashed lines from the RBS to the UEs.
  • T DU The guard time, T DU , at the switch from DL to UL should be dimensioned according to the Round Trip Propagation Delay (RTD), T RTD , plus the minimum time needed for a UE to switch from receive to transmit mode, TRX.TX.
  • RTD Round Trip Propagation Delay
  • T u the minimum time needed for a UE to switch from receive to transmit mode
  • the guard period between the uplink and downlink, TUD should be chosen according to the time it takes for the RBS to switch from reception to transmission and for a user terminal close to the RBS to switch from transmission to reception.
  • guard period T G U ARD , will be used below as a generic term for either or both of T D u or TUD-
  • the UEs which have a long RTD will be referred to as UEs located at the cell edges, particularly in large cells.
  • UEs located at the cell edges particularly in large cells.
  • long RTDs can conceivably occur for other UEs, and the invention is equally applicable in such cases.
  • the required guard time T D u at the switch from DL to UL depends on the RTD, which in this example depends on the cell size.
  • the RTD is fairly small, and in such cases, the switching time, T RXiT ⁇ , from receive to transmit mode in the UE will dominate the guard time T D u-
  • the RTD will dominate the guard time. For example, with a cell radius of 150 km, the RTD alone will be 1 ms. With one switching point from DL to UL every 5 or 10 ms, which is the case in some systems, such as, for example, some of the WiMAX modes of IEEE 802.11 , an RTD of 1 ms will lead to a significant overhead: with a DL-to-UL switch every 5 ms, the overhead from the guard time will exceed 20%. Thus, in large cells, the UEs at the cell edges will have quite large RTDs, and this will lead to quite large guard times T D u between DL and UL, which in turn will lead to a degradation of system performance.
  • a basic goal of the invention is thus to reduce the guard time T G U AR D between DL and UL, particularly in large cells. This is achieved by obtaining a certain characteristic of the user terminals which is relevant for TQUA RD , and by scheduling the user terminals for transmission and/or reception based upon the measured characteristic of the user terminals.
  • the characteristic which is obtained can in one particular application be the distance from the UE to the RBS, but other characteristics may also be envisioned for use, such as, for example, the RTD of the UEs.
  • the user terminal if the obtained characteristic exceeds a certain predefined threshold, the user terminal is not allowed to be scheduled for reception during a certain last part of the down link interval, e.g. during the TTIs just before the DL to UL switch, as an alternative to which if the obtained characteristic exceeds a certain predefined threshold, the user terminal is not scheduled for transmission during a certain initial part of the up link interval, e.g. during the UL TTIs just after the DL to UL switch.
  • the user terminal is not scheduled for transmission during a certain last part of the down link interval, nor for transmission during a certain initial part of the up link interval.
  • the UE in question may be freely scheduled (within the normal system restraints, naturally) for transmission (UL) or reception (DL) in one or more TTIs.
  • the scheduling is suitably carried out by a function in the RBS.
  • the obtained characteristic for a first user terminal exceeds the predetermined threshold during parts of the DL and/or UL, meaning that this first user terminal may not be allowed to be scheduled, it is still possible to schedule a second user terminal whose obtained characteristic does not exceed the threshold, and which is thus allowed to be scheduled.
  • the parts of the down link or the up link which have been mentioned and during which the UE is not scheduled for reception/transmission can be predefined sub-intervals in time of the UL and/or the DL interval respectively.
  • these "blocked parts" of the UL and/or DL may be determined adaptively depending on the characteristic which is measured, so that, for example, UEs with a very long RTD or a long distance to the RBS have longer "silent periods" in the UL and/or the DL than UEs which have shorter RTD or are at a closer distance to the RBS.
  • the entire "non blocked" part of the UL and/or DL will in principle be free for scheduling the UE in question.
  • the characteristic which is obtained may be obtained in a number of ways.
  • the characteristic may be measured by measuring means in the RBS, or by measuring means outside of the RBS, and then communicated to the RBS.
  • the characteristic is obtained from a memory, suitably but not necessarily in the RBS, in which it has been stored at a previous point in time, when it was measured or calculated.
  • the measurement of said characteristic of the UEs is preferably but not necessarily measured by the base station, which also handles the scheduling of the UEs in the UL and the DL.
  • the base station which also handles the scheduling of the UEs in the UL and the DL.
  • the characteristic which it is desired to obtain, for example by measurements, may be the RTD for the UEs in question, or, as an alternative, the distance of the UEs to the RBS, by means of which necessary quiet periods in the UL and/or the DL may be determined for the UEs.
  • the principle which is used may be expressed in the following way: UEs at the cell edge are not scheduled at the end of the DL transmission time period, and/or the cell edge UEs are not scheduled in the beginning of the UL transmission time period, as an alternative to which cell edge UEs are not scheduled either in the end of the DL transmission time period nor at the beginning of the UL transmission time period.
  • the UE in question may be freely scheduled (within the system restraints, naturally) for transmission (UL) or reception (DL) in one or more TTIs.
  • the scheduling is suitably carried out by a function in the RBS
  • the distance between the RBS and the UEs there are many different ways of determining, at least with sufficient accuracy for the purposes of this invention, the distance in question.
  • One such possibility is to use time alignment measurements which are carried out by the RBS on the signals received by the RBS from the different UEs.
  • Other possibilities for determining the distance between the RBS and the different UEs are to use positioning systems such as the GPS system or other such systems, or to use triangulation using information from a number of RBSs in adjacent cells.
  • fig 3 shows a possible implementation of the invention in the system shown previously in fig 1 : a certain radius R has been defined around the RBS 120 in the cell 110.
  • the guard time at the transition from DL to UL, T D u, is defined for UEs inside the radius R, and UEs outside of the radius R are handled by scheduling constraints.
  • UEs 130 within the distance R from the RBS 120 may at the same time be scheduled both at the end of the DL transmission period and at the beginning of the UL transmission period, while UEs 140 farther away from the RBS 120, on the other hand, may not simultaneously be scheduled at the end of the DL transmission period and the start of the UL transmission period, as an alternative to which they may not be scheduled in either.
  • the UE 130 from figs 1 and 3 is located close to the RBS, or at least within the radius R, while the UE 140 from the same figures is located outside of the radius R.
  • the UE 130 may be scheduled freely within both the UL and the DL, with the UL and the DL being illustrated with arrows in the same way as in fig 2.
  • the UE 140 which is at the cell edge or at least outside of the radius R may not be scheduled freely in both the UL and in the DL.
  • the "cell edge" UE 140 is allowed to be scheduled in the entire DL period, but is however not allowed to be scheduled for a certain initial period of TUL.
  • the UL period which becomes available to the UE 140 is a sub set of TUL referred to as TU L ' in fig 4.
  • the UE 140 may be freely scheduled (within the system restraints, naturally) for transmission in one or more TTIs.
  • the scheduling is suitably carried out by a function in the RBS.
  • fig 5 Another way of putting restrictions on UEs which are more than a certain distance from the RBS is shown in fig 5, with the same reference numbers as on fig 4: the UE 130 which is within the distance R from the RBS 120 may be freely scheduled within both the DL and the UL. However, the UE 140 which is still outside of the radius R may in this embodiment not be scheduled for reception at a certain last part of the DL period.
  • the total DL period is shown by means of a horizontal arrow T DL
  • T DL ' shows the DL sub-period available to the UE 140.
  • the UE 140 may be freely scheduled (within the system restraints, naturally) for reception (DL) in one or more TTIs.
  • the "forbidden" parts of the UL and/or the DL may be determined adaptively for each UE, or they can be set as one and the same forbidden period in the UL as well as in the DL.
  • the "cell edge" UE 140 may start to transmit before it has received the last DL data. As a safeguard against this, the UE 140 could be allowed to ignore such final DL data if the UE 140 has been scheduled in the initial portions of the UL. This could be handled by scheduling means in the UE.
  • the criteria for determining when and if the UE 140 should be allowed to ignore data in this way could be based on various criteria such as, for example: • The allocated DL-to-UL guard time, which could, for example, be signaled as system information from the RBS to the UE 140.
  • the RBS (or the scheduling function in general) needs to consider or to know or take into account the spatial separation of the two cell edge UEs.
  • Fig 7 is a flow chart 700 which shows some of the major steps of a method of the invention. Steps which are options or alternatives are shown by means of dashed lines.
  • the method is performed once per each scheduling occasion for each UE, which will usually be once per TTI, which, in the LTE example, will usually correspond to once per millisecond.
  • a certain characteristic C which is relevant for the interval between the UL and the DL, TQU ARD , of a least a first UE is obtained in one of the ways described above, i.e. either by measurements or retrieval from, for example, a memory.
  • the measurement may be made by measuring means in the RBS, which is indicated in block 720 with dashed lines, since the measuring may also be made outside of the RBS and then communicated to the RBS.
  • the TTI or TTIs which will be scheduled at present are TTIs at or around the adjacent edges of the UL and DL, i.e. TTIs adjacent to TQ UARD - Such TTIs are labelled edge TTIs in block 735 in fig 7. If the TTIs in question are not edge TTIs, it is possible to carry out the scheduling with no constraints.
  • the obtained characteristic is chosen to be either the user terminal's distance R from the RBS or its RTD, the Round Trip propagation Delay, between the UE and the base station. This block is also shown with dashed lines, since it is optional, the characteristic which is measured may be another one than these two.
  • the obtained characteristic is compared to a threshold T, and if it exceeds the threshold, the UE may not be scheduled for reception during a certain last part of the down link interval, and/or the UE may not be scheduled for transmission during a certain initial part of the up link interval.
  • At least one of said last part of the DL or the initial part of the UL is defined, depending on the magnitude of said obtained characteristic, or, block 770, at least one of said last part or initial part is a predefined sub- interval in time.
  • the UL scheduler decides which UEs to schedule in UL before the DL scheduler decides which UEs to schedule in DL, it is possible to take the UL scheduling decision into account when evaluating the DL scheduling constraint.
  • steps 710 and 730 may also be carried out in the reverse order, as will also become evident from the appended claims.
  • the scheduling of the first UE may be initiated, and the relevant characteristic then obtained.
  • step 730 after e.g. step 750, i.e., after the comparison with the threshold T.
  • Fig 8 schematically shows a block diagram of an RBS 800 with some of the components described above: thus, the RBS 800 comprises means 810 for scheduling the first UE to receive traffic from the RBS during the down link interval as well as means 820 for scheduling the UE to transmit traffic to the RBS 800 during the up link interval.
  • the RBS 800 comprises means 830 for measuring a certain characteristic of the UE, as well as means 840 for making said scheduling in at least one of said intervals based upon said measured characteristic of the first user terminal.
  • performance gains such as, for example, cell capacity and cell throughput in the order of 10-20% can be achieved by adding a constraint on the times that UEs far from the base station may be scheduled in either DL or UL.
  • the additional scheduling imposed on the DL-to-UL guard time for cell edge UEs can be taken from DL, and vice versa when the DL performance is limiting.
  • This invention is particularly beneficial in cells where the majority of the users are close to the RBS but in which some UEs are or can be very far from the RBS.
  • the invention can give large cell performance gains also when the majority of the users are close to the cell border.
  • the characteristic which is measured may be another than the RTD or the distance.

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

Abstract

L'invention concerne un procédé (700) destiné à être utilisé dans un accès sans fil (100) qui comporte une station de base (120, 800) et une cellule (110) qui peut recevoir un premier terminal utilisateur (130, 140). Dans le système, le premier terminal utilisateur (130, 140) peut être programmé pour recevoir un trafic provenant de la station de base (120) pendant un intervalle de liaison descendante, et le premier terminal utilisateur (130, 140) peut être programmé pour transmettre un trafic à la station de base (120, 800) pendant un intervalle de liaison montante, avec une période de garde entre eux. Conformément à l'invention, le procédé (700) comporte l'étape (710) consistant à obtenir une certaine caractéristique du premier terminal utilisateur qui est pertinente pour la période de garde, et l'étape (720) consistant à effectuer la programmation dans au moins l'un des intervalles sur la base de la caractéristique mesurée du premier terminal utilisateur (130, 140).
EP07701159A 2007-01-15 2007-01-15 Procédé et dispositif pour une performance améliorée dans un système duplex par répartition dans le temps à accès sans fil Ceased EP2104984A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/050017 WO2008088252A1 (fr) 2007-01-15 2007-01-15 Procédé et dispositif pour une performance améliorée dans un système duplex par répartition dans le temps à accès sans fil

Publications (2)

Publication Number Publication Date
EP2104984A1 true EP2104984A1 (fr) 2009-09-30
EP2104984A4 EP2104984A4 (fr) 2012-12-26

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EP (1) EP2104984A4 (fr)
CN (1) CN101682397B (fr)
WO (1) WO2008088252A1 (fr)

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CN102811494B (zh) * 2011-05-31 2015-09-09 华为技术有限公司 一种数据传输方法和装置
WO2013055337A1 (fr) * 2011-10-12 2013-04-18 Qualcomm Incorporated Transmission durant des périodes de garde
WO2013138715A1 (fr) * 2012-03-16 2013-09-19 Interdigital Patent Holdings, Inc. Procédé de fonctionnement fdd bidirectionnel à l'alternat dans un réseau fdd lte
CN103906255B (zh) * 2012-12-28 2017-11-21 展讯通信（上海）有限公司 多卡多待通信终端及其收发冲突处理方法与装置
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CN107431610A (zh) 2013-12-25 2017-12-01 华为技术有限公司 半双工频分双工的通信方法、基站和终端
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CN101682397B (zh) 2013-05-29
WO2008088252A1 (fr) 2008-07-24
EP2104984A4 (fr) 2012-12-26

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