EP2195958A2 - Procédé pour un fonctionnement de station d'abonné semi-duplex et duplex intégral dans des systèmes duplex à répartition en fréquence - Google Patents

Procédé pour un fonctionnement de station d'abonné semi-duplex et duplex intégral dans des systèmes duplex à répartition en fréquence

Info

Publication number
EP2195958A2
EP2195958A2 EP08834690A EP08834690A EP2195958A2 EP 2195958 A2 EP2195958 A2 EP 2195958A2 EP 08834690 A EP08834690 A EP 08834690A EP 08834690 A EP08834690 A EP 08834690A EP 2195958 A2 EP2195958 A2 EP 2195958A2
Authority
EP
European Patent Office
Prior art keywords
uplink
downlink
frame
start time
accordance
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.)
Withdrawn
Application number
EP08834690A
Other languages
German (de)
English (en)
Inventor
Krishna Balachandran
Doru Calin
Shyam P. Parekh
Ashok N. Rudrapatna
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.)
Nokia of America Corp
Original Assignee
Lucent Technologies Inc
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 US12/217,867 external-priority patent/US20100008332A1/en
Application filed by Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of EP2195958A2 publication Critical patent/EP2195958A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
    • 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
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0028—Variable division
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • 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
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • This invention relates generally to communication systems, and more particularly to Frequency Division Duplex (FDD) Orthogonal Frequency Division Multiple Access (OFDMA) systems.
  • FDD Frequency Division Duplex
  • OFDMA Orthogonal Frequency Division Multiple Access
  • IEEE 802.16e supports a number of advanced capabilities, such as scalable bandwidth, distributed and adjacent subcarrier based methods of subchannelization, and multiple antenna techniques.
  • IEEE 802.16e also mirrors several resource control capabilities found in 3G systems.
  • One limitation of IEEE 802.16e is that it is currently limited in practice to TDD operation where a single frequency carrier is used for both the downlink and uplink, and the downlink and uplink are separated in time.
  • FIG. 1 illustrates the current IEEE 802.16e TDD frame structure 100. Each frame is partitioned into downlink sub-frames 101 and uplink sub-frames 102. Downlink sub-frames 101 begin by transmitting control overhead including a preamble 111 , a Frame Control Header (FCH) message 121 , a downlink map (DL- MAP) message 131 , and an uplink map (UL-MAP) message 141.
  • Preamble 111 may be used for frame synchronization, channel state estimation, received signal strength and Signal-To-lnterference-Plus-Noise Ratio (SINR) estimation.
  • SINR Signal-To-lnterference-Plus-Noise Ratio
  • FCH Frame Control Header
  • DL-MAP downlink map
  • UL-MAP uplink map
  • Time gaps denoted as TTG (Transmit-to-Receive Transition Gap) 103 and RTG (Receive-to-Transmit Transition Gap) 104, are preferably inserted between downlink sub-frame 101 and uplink sub-frame 102, and at the end of each frame, Balachandran 54 -16-8-56 2 respectively, in order to allow transitions between transmission and reception functions.
  • Frequency Division Duplex (FDD) operation is of great interest to operators that own paired spectrum.
  • interoperable support of FDD requires a new framing structure definition which clearly specifies the downlink and uplink timing relationships as it relates to base station (BS) and mobile station (MS) operation.
  • BS base station
  • MS mobile station
  • the terms mobile station and subscriber station are used interchangeably herein.
  • H-FDD Half-Duplex FDD
  • a third consideration is the co-existence of mobile stations that support H- FDD and full FDD operation in the same sector carrier. This will ensure that operator investments in H-FDD terminals are preserved as terminals become more complex and evolve to full FDD capability.
  • a fourth consideration is that overhead be reduced relative to TDD. At a minimum, it should be no worse than the TDD case. There is also an improved link budget relative to TDD.
  • a fifth consideration is to maximize the utilization of the air interface resources by minimizing idle times. These capabilities are necessary in order to ensure that systems can quickly migrate from TDD to FDD operation, allow simpler H-FDD subscriber stations to be deployed and offer improvements that will make WiMAX-based OFDMA systems competitive with other systems based on other FDD technologies.
  • An exemplary embodiment of the present invention allows the start of an uplink frame to be offset relative to the downlink frame.
  • the offset is denoted by the Allocation Start Time (AST).
  • the AST is preferably signaled by the Base Station (BS) to the Subscriber station (SS) so the SS knows both the downlink (DL) and uplink (UL) frame start and end times.
  • the present invention also allows for enforcement of transition gaps from receive-to-transmit and transmit-to-receive on a per-subscriber basis as opposed to a system-wide basis.
  • the present invention utilizes resource allocation rules that are enforced upon receipt of resource allocation messages, such as MAP messages, to establish precedence on whether a mobile station is required to transmit or receive during a particular period.
  • the base station can support different frame durations (FDs) of interest, including but not limited to 2.5 ms, 5 ms and 10 ms frames. Longer frame durations have a number of benefits in terms of reduced overhead and improved link budget but shorter frames offer the possibility of improved latency. It is possible for a H- FDD subscriber station's uplink transmission to be scheduled such that it can receive the control region in a particular downlink frame, receive downlink data in the same frame and subsequently transmit on the uplink according to the constraining transition gaps.
  • FDs frame durations
  • a subscriber station if a subscriber station happens to miss a downlink control region which includes a preamble and/or a resource allocation message (MAP in the case of WiMAX) when transmitting on the uplink, it cannot receive data during that downlink frame nor get allocation for the corresponding UL frame.
  • Full-duplex operation is allowed for subscriber stations that possess this capability. These subscriber stations can co-exist with other H-FDD capable subscriber stations and share the radio resources as determined by the scheduler. Since simultaneous transmission and reception is possible for full-duplex mobiles, there is no need for transition gaps. Regardless of the assumed frame duration, transmissions on the UL can preferably span the entire frame period.
  • the BS scheduler can maximize the utilization of both DL and UL frames for HFDD SSs that cannot support simultaneous DL-UL operation by taking into account several factors that include (but not limited to): known locations of UL multiple access channel (Ranging channel in 802.16), CQI and ACK/NACK feedback in support of DL operation, and adequate provision for SSRTG/SSTTG gaps to switch between DL and UL allocation during nominal DL and UL frames.
  • any gap that arises between successive DL or UL frames due to the transmission of an integer valued number of symbols within a single frame may be minimized by proper choice of OFDMA symbol Cyclic Prefix duration in relation to the OFDMA symbol duration.
  • Half duplex capable SS are able to receive DL data and control and transmit UL data and control without conflict.
  • the SS can process control messages on DL and get ready to transmit on the UL.
  • the HFDD SS can receive control and data on a part of the DL frame while also transmitting UL control and data on a part of the concurrent UL frame.
  • the AST and duration of uplink allocation are signaled via existing fields in the UL-MAP.
  • the AST and duration of allocation are signaled via UCD/DCD messages.
  • FIG. 1 depicts an OFDMA frame with TDD operation in accordance with the prior art.
  • FIG. 2 depicts an FDD frame structure from the base station perspective in accordance with an exemplary embodiment of the present invention.
  • FIG. 3 depicts an FDD frame structure illustrating H-FDD subscriber station operation in accordance with an exemplary embodiment of the present invention.
  • FIG. 4 depicts an FDD frame structure illustrating operation of H-FDD and full FDD subscriber stations including the receive-transmit and transmit to receive gaps that are enforced on a per-subscriber basis in accordance with an exemplary embodiment of the present invention.
  • FIG. 5 depicts an FDD frame structure illustrating resource allocation to an H- FDD subscriber station running a downlink intensive application in accordance with an exemplary embodiment of the present invention.
  • FIG. 6 depicts an FDD frame structure illustrating resource allocation to an H- FDD subscriber station running an uplink intensive application in accordance with an exemplary embodiment of the present invention.
  • FIGs. 2 through 6 depict exemplary embodiments of the present invention, and more particularly embodiments that are applicable to an IEEE 802.16e/WiMAX based system.
  • FIG. 2 illustrates the frame structure 200 from a base station perspective while
  • FIG. 3 illustrates H-FDD operation with proposed frame structure 300; the DL/UL offset is shown modulo FD.
  • An exemplary embodiment of the present invention allows the start of the uplink frame to be offset relative to the downlink by an AST (Allocation Start Time).
  • the AST is preferably signaled by the Base Station (BS) to the Subscriber Station (SS) so it knows both the DL and UL frame start and end times.
  • the AST can assume any value greater than the FD but less than 2 * FD, where FD denotes the greater of the duration of one Downlink (DL) or Uplink (UL) frame. In this case because of the periodic nature of the frames, the actual observed DL-UL frame offset would be AST modulo FD.
  • the AST may not be restricted to the above interval, e.g. it can be less than FD or greater than 2*FD.
  • reduced allocation start time of less than a frame will become possible as processing power increases in subscriber stations over time and will allow the DL to UL resource allocation latency for a given terminal to be reduced further.
  • Exemplary embodiments of the present invention shown in FIGs. 3 and 4 also illustrate transition gaps from receive-to-transmit and transmit-to receive that are preferably enforced on a per-subscriber station basis as opposed to a system wide basis.
  • a transition gap for one subscriber station may be utilized to send data to or receive data from another subscriber station. This ensures that there is no inefficiency introduced into the system on account of transmit/receive transition gaps.
  • FIG. 5 illustrates an exemplary embodiment of a downlink intensive application to a half-duplex capable subscriber station.
  • the subscriber station can be in receive mode during all times except during the uplink control region.
  • FIG. 6 illustrates an exemplary embodiment of an uplink intensive application to a half-duplex capable subscriber station.
  • the subscriber station can be in transmit mode at all times except during the downlink control region where the preamble and MAP messages are transmitted by the base station.
  • resource allocation rules are preferably enforced upon receipt of resource allocation messages (e.g., MAP) in order to establish precedence on whether a mobile station is required to transmit or receive during a particular period.
  • base stations typically broadcast system parameters, such as the number of subchannels to be used in a sector, periodically on the DL.
  • These broadcast messages (BMs) are preferably intended for all subscriber stations and special precedence rules need to be defined for half- duplex capable subscriber stations to resolve conflicts between broadcast message reception and uplink transmission.
  • a base station avoids scheduling any UL transmissions when scheduling BMs. This enables all half duplex MSs to get the broadcast messages while wasting a part of the UL transmission bandwidth.
  • the base station avoids wasting UL bandwidth by scheduling UL transmissions as it normally would to selected H-FDD SSs.
  • the selected SSs preferably give higher priority to UL grants over any BMs scheduled to overlap with the UL transmissions.
  • One possible way for a SS to recover missed BMs due to conflicts with UL transmissions is for the BS to embed the required BM content within the DL bearer transmission to the SS as user traffic. Otherwise, the SS will have to receive the BM at one of the next broadcast reception opportunities, which could result in some additional delay for BM updates.
  • the BS scheduler can ensure that not too many BM and UL allocation conflicts take place, but the above precedence rules allow operation even with conflicts.
  • the present invention provides a number of benefits, in particular for OFDMA systems based on IEEE 802.16e/WiMAX and for next generation WiMAX systems that will be based on the IEEE 802.16m standard.
  • benefits include compatibility with existing TDD frame structures, smooth evolution to full FDD, similar resource allocation overhead to TDD and reduced overhead relative to other FDD Balachandran 54-16-8-56 7 solutions (translates into higher capacity), improved link budget, and reduced header/trailer overhead fractions which translate into a coverage improvement.
  • An additional benefit of the present invention is compatibility with TDD profile and existing hardware solutions thus reducing the time-to-market significantly for a FDD solution. Further, under the assumption of 5 ms frame duration, the present invention provides a 2x reduction in the fixed part of the MAP overhead relative to alternative solutions such as 2.5 ms DL/UL frames, that have been proposed. Under the assumption of scheduling the same number of bursts within a frame duration, the variable portion of the MAP overhead is also reduced by a factor of 2. The present invention also provides improved uplink link budget relative to TDD.
  • an exemplary embodiment of the present invention provides support of different frame durations of interest (e.g. 2.5 ms, 5 ms and 10 ms frames).
  • frame durations of interest e.g. 2.5 ms, 5 ms and 10 ms frames.
  • FIG. 4 it is possible for a half-duplex capable subscriber station's uplink transmission to be scheduled such that it can receive the control region in a particular downlink frame, receive downlink data in the same frame and subsequently transmit on the uplink. This is illustrated in FIG. 4 for mobile station 1 (MS1), mobile station 3 (MS3) and mobile station 4 (MS4).
  • a subscriber station happens to miss a downlink control region which includes a preamble and/or a resource allocation message (MAP in the case of WiMAX) when transmitting on the uplink, it cannot receive data during that downlink frame.
  • MAP resource allocation message
  • FIG.4 An exemplary embodiment depicted in FIG.4 illustrates the case where mobile station 1 (MS1) misses the DL control region in frame /c+1 due to an uplink transmission in frame k and cannot be scheduled to receive downlink data during frame /c+1 as a consequence.
  • MS1 mobile station 1
  • full-duplex operation is allowed for subscriber stations that possess this capability. These subscriber stations can coexist with other H-FDD capable subscriber stations and share the radio resources as determined by the scheduler. Since simultaneous transmission and reception is possible for full-duplex mobiles, there is no need for transition gaps. Also during these times, other subscriber stations who are not scheduled for UL transmission can listen to the DL control messages and subsequently receive DL data transmission.
  • transmissions on the UL preferably span the entire frame period. This provides a link budget advantage since data bursts may be transmitted on fewer sub-channels and more symbols thus improving SINR on UL. For example, consider the case where a burst is scheduled on a single subchannel requiring all usable symbols (S FDD ) in the uplink frame. This case may be Balachandran 54-16-8-56 8 compared with a TDD case where the same transmission needs to be scheduled across S TD D symbols where S FDD > S TDD - In this case, more than one sub-channel needs to be used to schedule the transmission in TDD.
  • S FDD usable symbols
  • An exemplary embodiment of the present invention also allows larger bursts to be scheduled on a pre-determined number of sub-channels, thus reducing the fraction of MAC header and any cyclic redundancy check (CRC) overhead.
  • CRC cyclic redundancy check

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

Abstract

La présente invention porte sur une nouvelle structure de trame, qui peut être utilisée pour faire évoluer de façon souple une technologie de communication sans fil duplex à répartition dans le temps (TDD) en une technologie de communication sans fil duplex à répartition en fréquence. Un procédé pour établir le temps de démarrage d'une trame de liaison montante qui est décalée par rapport à une trame de liaison descendante d'un temps de démarrage d'allocation est fourni. De plus, l'invention porte également sur des procédés d'allocation de ressources de liaison descendante et de liaison montante pour un fonctionnement semi-duplex et duplex intégral à répartition en fréquence avec des intervalles de temps de transmission-réception et réception-transmission prévus de manière adéquate.
EP08834690A 2007-09-27 2008-09-24 Procédé pour un fonctionnement de station d'abonné semi-duplex et duplex intégral dans des systèmes duplex à répartition en fréquence Withdrawn EP2195958A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US99583607P 2007-09-27 2007-09-27
US12/217,867 US20100008332A1 (en) 2008-07-09 2008-07-09 Method for half-and full-duplex subscriber station operation in frequency division duplex systems
PCT/US2008/011081 WO2009042158A2 (fr) 2007-09-27 2008-09-24 Procédé pour un fonctionnement de station d'abonné semi-duplex et duplex intégral dans des systèmes duplex à répartition en fréquence

Publications (1)

Publication Number Publication Date
EP2195958A2 true EP2195958A2 (fr) 2010-06-16

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EP08834690A Withdrawn EP2195958A2 (fr) 2007-09-27 2008-09-24 Procédé pour un fonctionnement de station d'abonné semi-duplex et duplex intégral dans des systèmes duplex à répartition en fréquence

Country Status (5)

Country Link
EP (1) EP2195958A2 (fr)
JP (1) JP2010541381A (fr)
KR (1) KR20100055495A (fr)
CN (1) CN101809928A (fr)
WO (1) WO2009042158A2 (fr)

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US10405306B2 (en) * 2011-09-29 2019-09-03 Qualcomm Incorporated Half-duplex operation for low cost wireless devices
FR2985124B1 (fr) * 2011-12-22 2014-08-15 Cassidian Sas Procede de duplexage par division de frequence pour des systemes de communication sans fil
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US10172155B2 (en) 2015-07-29 2019-01-01 Qualcomm Incorporated Bundling and hybrid automatic repeat request operation for enhanced machine-type communication
JPWO2017191809A1 (ja) * 2016-05-02 2019-03-28 株式会社Ｎｔｔドコモ ユーザ端末及び無線通信方法
WO2017222137A2 (fr) * 2016-06-22 2017-12-28 Lg Electronics Inc. Procédé et appareil d'attribution de ressources à un ue en mode fdr dans un système de communication sans fil
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Also Published As

Publication number Publication date
CN101809928A (zh) 2010-08-18
WO2009042158A3 (fr) 2009-07-09
KR20100055495A (ko) 2010-05-26
WO2009042158A2 (fr) 2009-04-02
JP2010541381A (ja) 2010-12-24

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