WO2007019567A2 - Procede et appareil pour obtenir une macrodiversite entre noeuds b dans un systeme a acces multiple par repartition en frequence a porteuse unique - Google Patents

Procede et appareil pour obtenir une macrodiversite entre noeuds b dans un systeme a acces multiple par repartition en frequence a porteuse unique Download PDF

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Publication number
WO2007019567A2
WO2007019567A2 PCT/US2006/031241 US2006031241W WO2007019567A2 WO 2007019567 A2 WO2007019567 A2 WO 2007019567A2 US 2006031241 W US2006031241 W US 2006031241W WO 2007019567 A2 WO2007019567 A2 WO 2007019567A2
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WO
WIPO (PCT)
Prior art keywords
node
wtru
subcarrier block
active set
information regarding
Prior art date
Application number
PCT/US2006/031241
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English (en)
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WO2007019567A3 (fr
Inventor
Guodong Zhang
Jung-Lin Pan
Yingming Tsai
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Interdigital Technology 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 Interdigital Technology Corporation filed Critical Interdigital Technology Corporation
Publication of WO2007019567A2 publication Critical patent/WO2007019567A2/fr
Publication of WO2007019567A3 publication Critical patent/WO2007019567A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention is related to a wireless communication system. More particularly, the present invention is related to a method and apparatus for inter-Node-B macro diversity in a single carrier frequency division multiple access (SC-FDMA) system.
  • SC-FDMA single carrier frequency division multiple access
  • the third generation partnership project (3GPP) and 3GPP2 are currently considering a long term evolution (LTE) of the universal mobile telecommunication system (UMTS) terrestrial radio access (UTRA).
  • LTE long term evolution
  • UMTS universal mobile telecommunication system
  • UTRA universal mobile telecommunication system
  • SC-FDMA SC-FDMA is adopted for the uplink air interface of the evolved UTRA.
  • a plurality of orthogonal subcarriers are transmitted simultaneously.
  • the subcarriers are divided into a plurality of subcarrier blocks, (also known as resource blocks (RBs)).
  • a block of subcarriers is a basic resource unit in an SC-FDMA system.
  • the subcarrier block may be either a localized subcarrier block or a distributed subcarrier block.
  • the localized subcarrier block is a set of consecutive subcarriers and the distributed subcarrier block is a set of equally spaced non-consecutive subcarriers.
  • Figure IA illustrates two localized subcarrier blocks, each comprising four consecutive subcarriers.
  • the localized subcarrier block is a basic scheduling unit for uplink transmissions in a localized-mode SC-FDMA system.
  • Figure IB illustrates two distributed subcarrier blocks.
  • the distributed subcarrier block 1 includes subcarriers 1, 5 and 9, and the distributed subcarrier block 2 includes subcarriers 3, 7 and 11.
  • the distributed subcarrier block is a basic scheduling unit for uplink transmissions in a distributed-mode SC-FDMA system.
  • a Node-B assigns at least one subcarrier block for uplink transmissions for a wireless transmit/receive unit (WTRU).
  • WTRU wireless transmit/receive unit
  • the present invention is related to a method and apparatus for inter-Node-B macro diversity in an SC-FDMA system.
  • a distributed subcarrier block including sufficient number of subcarriers to guarantee sufficient frequency diversity for a WTRU for uplink transmission.
  • the location of the subcarriers is fixed.
  • the information regarding the assigned distributed subcarrier block is sent to Node-Bs in an active set of the WTRU and the Node-Bs receive and decode uplink transmission of the WTRU based on the information.
  • a subcarrier block (either a distributed subcarrier block or a localized subcarrier block), and a starting seed in a frequency and time hopping sequence is allocated to a WTRU for uplink transmission.
  • the information regarding the assigned subcarrier block and the starting seed is sent to Node-Bs in an active set of the WTRU and the Node-Bs receive and decode uplink transmission based on the information.
  • Figure IA shows a set of localized subcarrier blocks.
  • Figure IB shows a set of distributed subcarrier blocks.
  • Figure 2 shows an exemplary wireless communication system configured in accordance with the present invention.
  • Figures 3 and 4 show exemplary resource unit assignment in accordance with a first embodiment of the present invention.
  • Figures 5 and 6 illustrate an inter-Node-B handover of a low data rate WTRU and a high data rate WTRU, respectively, in accordance with the first embodiment of the present invention.
  • Figures 7 and 8 show exemplary resource unit assignment for localized mode and distributed mode, respectively, in accordance with a second embodiment of the present invention.
  • Figure 9 illustrates an inter-Node-B handover in accordance with the second embodiment of the present invention.
  • WTRU includes but is not limited to a user equipment (UE), a mobile station (STA), a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment.
  • Node-B includes but is not limited to a base station, a site controller, an access point (AP) or any other type of interfacing device in a wireless environment.
  • the features of the present invention may be incorporated into an integrated circuit (IC) or be configured in a circuit comprising a multitude of interconnecting components.
  • FIG. 2 shows an exemplary wireless communication system 200 configured in accordance with the present invention.
  • the system 200 includes at least one WTRU 202, a plurality of Node-Bs 204a-204c, a plurality of cells 208a- 208i, and optionally an access gateway (aGW) 206, (or a radio network controller).
  • the Node-B 204a controls the cells 208a-208c
  • the Node-B 204b controls the cells 208d-208f
  • the Node-B 204c controls the cells 208g-208i.
  • the Node-Bs 204a-204c may be directly connected to each other via a link 212 or via the aGW 206, (or a radio network controller).
  • the WTRU 202 is currently associated with the cell 208a, (i.e., serving cell), and the Node-B 204a, (i.e., serving Node-B). For uplink transmissions, the WTRU 202 sends a request for resource unit allocation to the Node-B 204a.
  • the Node-B 204a assigns at least one subcarrier block, (either a distributed subcarrier block or a localized subcarrier block) to the WTRU 202, based on data rate requirements and/or buffer occupancy of the WTRU 202.
  • a distributed mode SC-FDMA is implemented without channel dependent scheduling.
  • the Node-B assigns at least one distributed subcarrier block to the WTRU and the location of the assigned distributed subcarrier block(s) is fixed.
  • One distributed subcarrier block includes a plurality of subcarriers and the number of subcarriers is large enough to provide sufficient frequency diversity. Since it is unlikely that all equally-spaced subcarriers in the assigned distributed subcarrier block go under deep fading simultaneously, good frequency diversity is achieved.
  • At least one distributed subcarrier block including sufficient number of subcarriers is assigned to the WTRU and the WTRU transmits data via the assigned subcarrier block.
  • At least one distributed subcarrier block having sufficient number of subcarriers is assigned to the WTRU, and uplink transmissions are multiplexed with other WTRUs.
  • the uplink transmissions may be multiplexed over multiple transmission time intervals (TTIs) with other WTRUs in a persistent manner.
  • TTIs transmission time intervals
  • the length of a TTI is one or several sub-frames. That is, the WTRU is allowed to transmit on the assigned subcarrier block every X out of Y TTIs. For example, assume that the WTRU requests only 8 subcarriers.
  • the Node-B assigns 32 subcarriers in one distributed subcarrier block to the WTRU in order to guarantee frequency diversity allowing the WTRU to transmit only one TTI out of 4 TTIs in a persistent manner. Therefore, the average data rate is equivalent to the case providing 8 subcarriers allowing the WTRU to transmit every TTI.
  • FIG. 3 shows exemplary resource unit assignment in accordance with this option.
  • WTRU A and WTRU C require high data rates but WTRU B requires a low data rate.
  • WTRU A and WTRU C are assigned with distributed subcarrier blocks 1 and 3, respectively and may transmit data on the assigned subcarrier blocks without any restriction in time domain.
  • WTRU B is assigned with a distributed subcarrier block 2, which includes a sufficient number of subcarriers to guarantee frequency diversity, but is allowed to transmit only one TTI out of 4 TTIs.
  • the uplink transmissions may be multiplexed within one TTI among other WTRUs.
  • the WTRU is allowed to transmit every X out of Y symbols within one TTI in a persistent manner.
  • Figure 4 shows exemplary resource unit assignment in accordance with this alternative option.
  • WTRU D requires high data rates
  • WTRU A and WTRU B require a medium data rate
  • WTRU C, WTRU E, WTRU F, WTRU G and WTRU H require a low data rate.
  • WTRU D is assigned with distributed subcarrier block 3 and may transmit data on the subcarrier block 3 without any restriction in the time domain.
  • FIGS 5 and 6 illustrate an inter-Node-B handover of a low data rate WTRU 502 and a high data rate WTRU 602, respectively, in accordance with the first embodiment of the present invention.
  • transmissions from a WTRU 502, (602) are received and processed by at least two Node-Bs 504a, 504b, (604a, 604b).
  • the Node-Bs 504a, 504b, (604a, 604b) received information about the resource unit assignment for the WTRU 502, (602) via a control plane aGW, an RNC or other entity (such as, a primary Node- B selected among the Node-Bs associated with the active set).
  • the information includes the number of subcarrier blocks assigned to the WTRU 502, (602), and the location of assigned subcarrier blocks and time schedule, (e.g., X out of Y TTIs or X out of Y symbols within one TTI), that the WTRU 502, (602) may transmit on the assigned subcarrier block(s).
  • Both Node- Bs 504a, 504b, (604a, 604b) process data blocks transmitted by the WTRU 502, (502) and forward correctly decoded data blocks to a centralized entity such as a user plane aGW 210 or an RNC, (as shown in Figure 2). If there are more than one successfully decoded data block is forwarded, redundant data blocks are ignored.
  • the Node-Bs 504a, 504b, (604a, 604b) know the subcarrier block(s) and time schedule that the WTRU 502, (502) is transmitting, the Node- Bs 504a, 504b, (604a, 604b) may receive and process the signals transmitted by the WTRU 502, (602). In this way, the macro diversity is achieved while keeping the frequency and time diversity within the cell.
  • a frequency and time hopping is implemented.
  • a Node-B assigns at least one subcarrier block, (either a distributed subcarrier block or a localized subcarrier block) to the WTRU, based on data rate requirement and/or buffer occupancy of the WTRU.
  • the location of the assigned subcarriers is not fixed, but changed in accordance with a pseudo random frequency and time hopping sequence.
  • Each WTRU is assigned to a unique seed, (or starting point), of the pseudo random frequency and time hopping sequence. With the frequency and time hopping, a WTRU transmits on different subcarrier blocks and/or in different TTIs in accordance with the frequency and time hopping sequence.
  • Figure 7 shows exemplary resource unit assignment for a localized mode in accordance with the second embodiment of the present invention.
  • WTRU A and WTRU B transmit on localized subcarrier blocks 1 and 2, respectively.
  • WTRU B and WTRU C transmit on localized subcarrier blocks 1 and 2, respectively.
  • WTRU C and WTRU A transmit on localized subcarrier blocks 1 and 2, respectively.
  • FIG. 8 shows exemplary resource unit assignment for a distributed mode in accordance with the second embodiment of the present invention.
  • WTRU A transmits on a distributed subcarrier block 1
  • WTRU B transmits on a distributed subcarrier block 4
  • WTRU C transmits on a distributed subcarrier block 2.
  • WTRU A transmits on a distributed subcarrier block 4
  • WTRU B transmits on a distributed subcarrier block 1.
  • WTRU A transmits on a distributed subcarrier block 2
  • WTRU B transmits on a distributed subcarrier block 3
  • WTRU C transmits on a distributed subcarrier block 1.
  • Figure 9 illustrates a'n inter-Node-B handover in accordance with the second embodiment of the present invention.
  • transmissions from a WTRU 902 are received and processed by at least two Node-Bs 904a, 904b.
  • the Node-Bs 904a, 904b received information about the resource unit assignment for the WTRU 902 via a control plane aGW 210 or an RNC, (as shown in Figure 2) or other entity (such as, a primary Node-B selected among the Node-Bs associated with the active set).
  • the information includes the number of subcarrier blocks assigned to the WTRU 902 and the seed of the pseudo random frequency and time hopping sequence assigned to the WTRU 902.
  • the Node-Bs 904a, 904b process data blocks transmitted by the WTRU 902 and forward correctly decoded data blocks to the centralized entity such as a user plane aGW 210 or an RNC. If there are more than one successfully decoded data block is forwarded, redundant data blocks are ignored.
  • the channels, (combination of subcarrier blocks and TTIs), used by the WTRU 902 changes from time to time, since the Node-Bs 904a, 904b know the seed of the pseudo random frequency and time hopping sequence used by the WTRU 902, the Node-Bs 904a, 904b know the subcarrier blocks and time instances that the WTRU 902 is transmitting and may receive and process the signals transmitted by the WTRU 902. In this way, the macro diversity is achieved while keeping the frequency and time diversity within the cell.
  • FDMA system including at least one WTRU and a plurality of Node-Bs.
  • the number of subcarriers in the distributed subcarrier block being large enough to provide frequency diversity and location of the subcarriers being fixed.
  • FDMA system including at least one WTRU and a plurality of Node-Bs.
  • the method of embodiment 12 comprising assigning at least one subcarrier block including a plurality of subcarriers and a seed in a frequency and time hopping sequence to a WTRU for uplink transmission.
  • the method of embodiment 13 comprising sending information regarding the assigned subcarrier block(s) and the seed for the WTRU to Node-Bs in an active set of the WTRU.
  • Bs in the active set receiving and decoding the data packets transmitted by the WTRU in at least one of frequency hopping and time hopping manner based on the information.
  • the Node-B of embodiment 22 comprising a radio resource allocation unit configured to allocate at least one distributed subcarrier block and time schedule for uplink transmission to a WTRU, the number of subcarriers in the distributed subcarrier block being large enough to provide frequency diversity and location of the subcarriers being fixed
  • the Node-B as in any embodiments 23-24 comprising a receiver configured to receive and decode uplink transmission of the WTRU based on the information.
  • WTRU is sent to the Node-Bs in the active set of the WTRU via an access gateway.
  • WTRU is sent to the Node-Bs in the active set of the WTRU via a radio network controller.
  • WTRU is sent to the Node-Bs in the active set of the WTRU via a primary Node-
  • the Node-B of embodiment 22 comprising a radio resource allocation unit configured to allocate at least one subcarrier block and a seed in a frequency and time hopping sequence to a WTRU.
  • radio resource allocation unit configured to send information regarding the allocated subcarrier block(s) and the seed to Node-Bs in an active set of the WTRU.

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

Abstract

L'invention concerne un procédé et un appareil pour obtenir une macrodiversité entre noeuds B dans un système à accès multiple par répartition en fréquence à porteuse unique (SC-FDMA). Selon l'invention, un bloc de sous-porteuses réparti comprenant un nombre de sous-porteuses suffisant pour garantir une diversité de fréquence est attribué à une unité de transmission/réception sans fil (WTRU) pour une transmission sens montant. L'emplacement des sous-porteuses est fixe. Les informations relatives au bloc de sous-porteuses réparti attribué sont envoyées à des noeuds B dans un ensemble actif de l'unité WTRU et ces noeuds B reçoivent et décodent la transmission sens montant d'après ces informations. Dans une variante, un bloc de sous-porteuses (réparti ou localisé) et un noyau de départ dans une séquence de saut de fréquence et de temps sont attribués à une unité WTRU pour une transmission sens montant. Les informations relatives au bloc de sous-porteuses et au noyau de départ attribués sont envoyées à des noeuds B dans un ensemble actif de l'unité WTRU et ces noeuds B reçoivent et décodent la transmission sens montant d'après ces informations.
PCT/US2006/031241 2005-08-09 2006-08-08 Procede et appareil pour obtenir une macrodiversite entre noeuds b dans un systeme a acces multiple par repartition en frequence a porteuse unique WO2007019567A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US70657005P 2005-08-09 2005-08-09
US60/706,570 2005-08-09
US70697005P 2005-08-10 2005-08-10
US60/706,970 2005-08-10

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WO2007019567A2 true WO2007019567A2 (fr) 2007-02-15
WO2007019567A3 WO2007019567A3 (fr) 2007-05-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009043208A1 (fr) * 2007-09-29 2009-04-09 Zte Corporation Procédés et appareils pour générer et analyser une signalisation d'allocation de ressource continue

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060146949A1 (en) * 2004-11-29 2006-07-06 Intel Corporation Multicarrier communication system and methods for communicating with subscriber stations of different bandwidth profiles
US20060233124A1 (en) * 2005-04-19 2006-10-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US20070005749A1 (en) * 2005-06-16 2007-01-04 Qualcomm Incorporated Robust rank perdiction for a MIMO system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060146949A1 (en) * 2004-11-29 2006-07-06 Intel Corporation Multicarrier communication system and methods for communicating with subscriber stations of different bandwidth profiles
US20060233124A1 (en) * 2005-04-19 2006-10-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US20070005749A1 (en) * 2005-06-16 2007-01-04 Qualcomm Incorporated Robust rank perdiction for a MIMO system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009043208A1 (fr) * 2007-09-29 2009-04-09 Zte Corporation Procédés et appareils pour générer et analyser une signalisation d'allocation de ressource continue
US8340037B2 (en) 2007-09-29 2012-12-25 Zte Corporation Methods and apparatuses for generating and parsing continuous resource allocation signaling

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