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WO2010092474A1 - Procédé, appareil et produit-programme informatique pour la configuration de créneaux - Google Patents

Procédé, appareil et produit-programme informatique pour la configuration de créneaux Download PDF

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Publication number
WO2010092474A1
WO2010092474A1 PCT/IB2010/000286 IB2010000286W WO2010092474A1 WO 2010092474 A1 WO2010092474 A1 WO 2010092474A1 IB 2010000286 W IB2010000286 W IB 2010000286W WO 2010092474 A1 WO2010092474 A1 WO 2010092474A1
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WO
WIPO (PCT)
Prior art keywords
sub
frame
downlink
multicast
uplink
Prior art date
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PCT/IB2010/000286
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English (en)
Inventor
Tommi Tapani Koivisto
Hai Ming Wang
Jing HAN
Erlin Zeng
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Nokia Inc
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Nokia Inc
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Publication of WO2010092474A1 publication Critical patent/WO2010092474A1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—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
    • 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
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels

Definitions

  • Embodiments of the present invention relate generally to communications management, and, more particularly, relate to a method, apparatus, and a computer program product for time slot configuration within communications systems.
  • wireless networks may employ various techniques, such as hardware or software solutions, to increase the bandwidth and transfer rates of the wireless network and to increase coverage of wireless networks.
  • One technique may involve relaying of communications between access points to increase the transfer rates and the coverage provided by a wireless communications system.
  • example embodiments of the present invention facilitate communications between a relaying node and a donor node to improve, for example, system bandwidth and/or system coverage.
  • example embodiments of the present invention facilitate communications between the relaying node and the donor node in a relaying or backhauling link between the nodes.
  • the communications conducted within the relaying or backhauling link may be conducted in a manner such that the communications do not interfere with communication between the nodes and user equipment (e.g., mobile communications devices).
  • Various example embodiments of the present invention define sub-frame time slots according to various configurations to avoid communications interference. In this
  • baseline uplink-downlink pairing configurations between the relaying node and the donor node within a time division duplexing environment may be identified and defined for relaying or backhauling link communications.
  • spare sub-frames may also be defined to enable feedback and/or re-transmission of relaying or backhauling link communications in the event that, for example, baseline configurations are insufficient.
  • One example embodiment is an example method, which comprises causing establishment of a backhaul link between a donor node and a relay node, and causing communications via the backhaul link to be conducted in accordance with baseline sub- frame uplink-downlink pairings, wherein at least one sub-frame within the baseline sub- frame uplink-downlink pairings is implemented as a multicast to downlink sub-frame pairing. Additionally or alternatively, according to some example embodiments, causing communications includes causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is a multicast multicast/broadcast over single frequency network sub-frame to downlink pairing.
  • causing communications includes causing communications using inband resources for the backhaul link in a time division duplexing network. Additionally or alternatively, according to some example embodiments, causing communications includes causing communications to be conducted in accordance with the baseline sub-frame uplink- downlink pairings, wherein a time slot for the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is based on an implemented uplink-downlink time slot configuration. Additionally or alternatively, according to some example embodiments, the example method includes modifying a capacity of the backhaul link based on a throughput analysis by modifying the baseline sub-frame uplink-downlink pairings.
  • modifying the baseline sub-frame uplink-downlink pairings includes introducing an additional multicast to downlink sub-frame pairing as a spare sub-frame or removing a multicast to downlink sub-frame pairing.
  • An example apparatus includes at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, direct the apparatus at least to perform causing establishment of a backhaul link between a donor node and a relay node and causing communications via the backhaul link to be conducted in accordance with baseline sub-frame uplink-downlink pairings, wherein at least one sub-frame within the baseline sub-frame uplink-downlink pairings is implemented as a multicast to downlink sub-frame pairing.
  • the apparatus directed to perform causing communications includes being directed to perform causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is a multicast multicast/broadcast over single frequency network sub-frame to downlink pairing. Additionally or alternatively, according to some example embodiments, the apparatus directed to perform causing communications includes being directed to perform causing communications using inband resources for the backhaul link in a time division duplexing network.
  • the apparatus directed to perform causing communications includes being directed to perform causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein a time slot for the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is based on an implemented uplink- downlink time slot configuration. Additionally or alternatively, according to some example embodiments, the apparatus is further directed to perform modifying a capacity of the backhaul link based on a throughput analysis by modifying the baseline sub-frame uplink-downlink pairings.
  • the apparatus directed to perform modifying the baseline sub-frame uplink- downlink pairings includes being directed to perform introducing an additional multicast to downlink sub-frame pairing as a spare sub-frame or removing a multicast to downlink sub-frame pairing.
  • the apparatus comprises a base station and further comprises communications circuitry and components for establishing the backhaul link. Additionally or alternatively, according to some example embodiments, the communications circuitry and components include at least one antenna.
  • Another example embodiment is a computer program product comprising at least one computer readable storage medium including computer program code, the computer program code configured to direct an apparatus to at least perform causing establishment of a backhaul link between a donor node and a relay node and causing communications via the backhaul link to be conducted in accordance with baseline sub-frame uplink- downlink pairings, wherein at least one sub-frame within the baseline sub-frame uplink- downlink pairings is implemented as a multicast to downlink sub-frame pairing.
  • the computer program code configured to direct the apparatus to perform causing communications includes being configured to direct the apparatus to perform causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is a multicast multicast/broadcast over single frequency network sub-frame to downlink pairing. Additionally or alternatively, according to some example embodiments, the computer program code configured to direct the apparatus to perform causing communications includes being configured to direct the apparatus to perform causing communications using inband resources for the backhaul link in a time division duplexing network.
  • the computer program code configured to direct the apparatus to perform causing communications includes being configured to direct the apparatus to perform causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein a time slot for the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is based on an implemented uplink- downlink time slot configuration. Additionally or alternatively, according to some example embodiments, the computer program code is further configured to direct the apparatus to perform modifying a capacity of the backhaul link based on a throughput analysis by modifying the baseline sub-frame uplink-downlink pairings.
  • the computer program code configured to direct the apparatus to perform modifying the baseline sub-frame uplink- downlink pairings includes being configured to direct the apparatus to perform introducing an additional multicast to downlink sub-frame pairing as a spare sub-frame or removing a multicast to downlink sub-frame pairing.
  • Another example apparatus comprises means for causing establishment of a backhaul link between a donor node and a relay node, and means for causing communications via the backhaul link to be conducted in accordance with baseline sub- frame uplink-downlink pairings, wherein at least one sub-frame within the baseline sub- frame uplink-downlink pairings is implemented as a multicast to downlink sub-frame pairing.
  • the means for causing communications includes means for causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is a multicast multicast/broadcast over single frequency network sub-frame to downlink pairing.
  • the means for causing communications includes means for causing communications using inband resources for the backhaul link in a time division duplexing network. Additionally or alternatively, according to some example embodiments, the means for causing communications includes means for causing communications to be conducted in accordance with the baseline sub-frame uplink-downlink pairings, wherein a time slot for the at least one sub-frame implemented as the multicast to downlink sub-frame pairing is based on an implemented uplink-downlink time slot configuration. Additionally or alternatively, according to some example embodiments, the example apparatus further comprises means for modifying a capacity of the backhaul link based on a throughput analysis by modifying the baseline sub-frame uplink-downlink pairings.
  • the means for modifying the baseline sub-frame uplink-downlink pairings includes means for introducing an additional multicast to downlink sub-frame pairing as a spare sub-frame or removing a multicast to downlink sub-frame pairing.
  • FIG. IA is an illustration of a communications environment according to various exemplary embodiments of the present invention.
  • FIG. IB is a table describing the quadraplex operations of the relay node in time division duplexing according to various exemplary embodiments of the present invention.
  • FIG. 1C is a table for identifying the time division duplexing uplink and downlink pairing according to various exemplary embodiments of the present invention
  • FIGs. 2, 5, 6 and 7 depict time slot configurations according to various exemplary embodiments of the present invention
  • FIG. 3 is a table describing example baseline configurations or designs for time division duplexing multicast/broadcast over single frequency network relay uplink-downlink time slot configurations and backhaul link hybrid automatic repeat request data according to various exemplary embodiments of the present invention
  • FIG. 4 is a table describing spare sub-frames according to various exemplary embodiments of the present invention
  • FIG. 8 is a comprehensive table describing example time slot configurations according to various example embodiments of the present invention
  • FIG. 9 is a block diagram of an apparatus for time slot configuration according to various example embodiments of the present invention.
  • FIG. 10 depicts a flowchart of a method for time slot configuration according to various example embodiments of the present invention.
  • FIG. IA depicts a communications system including a layer 3 (L3) relay node
  • the communications system of FIG. IA may employ time division duplexing (TDD), where the system may be an Evolved Universal Terrestrial Access Network (EUTRAN) system.
  • TDD time division duplexing
  • EUTRAN EUTRAN node Bs
  • eNBs EUTRAN node Bs
  • EUTRA User Equipment
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • PHY physical (layer 1)
  • RRC radio resource control
  • the eNBs may be interconnected with each other by means of an interface, refered to as the X2 interface.
  • the eNBs may also be connected by means of a second interface, referred to as the Sl interface, to an evolved packet core (EPC), or, more specifically to a mobility management entity (MME) by means of a Sl MME interface and to a serving gateway (SGW) by means of an Sl interface.
  • EPC evolved packet core
  • MME mobility management entity
  • SGW serving gateway
  • the Sl interface may support a many to many relationship between MMEs / Serving Gateways and eNBs.
  • the donor node 103 may be an eNB and the RN 100 may employ a relaying technique for self-backhauling to, in some example embodiments, extend coverage and improve capacity.
  • the RN 100 may be party to a relay link 102, which may also be referred to, in some example embodiments as a backhaul link or a donor cell eNB-RN link, with the donor node 103 to, for example, make capacity available for communications with the UE 101, which may be a release-8 (Rel-8) UE.
  • Rel-8 release-8
  • the RN 100 and the donor node 103 may utilize inband resources for the relay link in a TDD network to provide an efficient solution for self-backhauling.
  • some example embodiments of the present invention address the TDD uplink (UL) downlink (DL) time slot configuration for the donor node 103 and the RN 100, and Rel-8 UE backwards compatibility.
  • the RN 100 node may also be an eNB supporting one or more cells or sectors.
  • the RN 100 may be accessible to Rel-8 UEs (e.g., UE 101) and may provide DL common and shared control signaling, (e.g., primary synchronization channel (P-SCH), secondary synchronization channel (S-SCH), physical broadcast channel (P-BCH), common reference signal (CRS)), to allow UEs to access the L3 RN 100.
  • the RN 100 may be wirelessly connected to the rest of the radio access network (RAN) via donor node 103, which may provide a larger coverage area.
  • RAN radio access network
  • donor node 103 which may provide a larger coverage area.
  • Some example embodiments of the present invention consider the utilization of inband resources in a self-backhauling technique. By employing a backhauling technique, flexibility is brought to the system. However, particularly as the number of UEs connected to the RN 100 increases, bandwidth is utilized to support the self-backhauling technique. In some situations, for example, when relay link 102 uses in-band resources, interference may occur between the relay link 102 and the communications with a UE. In particular, downlink transmissions to UEs may interfere with the downlink reception from the donor node 103 with respect to the relay link 102. Accordingly, various example embodiments of the present invention provide mechanisms for preventing this and other interference. Further, some example embodiments, also support service to Rel-8 UEs by the RN 100. In some example embodiments, service to Rel-8 UEs by the RN 100 may be provided in a same sub-frame as the RN 100 is communicating with the donor node 103.
  • a quadruplex frame structure may be utilized as illustrated in Figure IB.
  • the RN When the RN is in the receive mode (DL time slot in donor node cell) or transmit mode (UL time slot in donor node cell) on the relay link in sub-frame i and i+2, respectively, the RN may not, at the same time, be in the transmit mode (DL timeslot in RN cell) or receive mode (UL timeslot in RN cell) on the RN UE link. However, in some example embodiments, this may be possible in the sub-frame i+1 and i+3, respectively.
  • the shaded blocks in the second row in FIG. IB indicate the operation for the donor node attached UE, while the unshaded blocks in the second row indicate the operation for the RN attached UE.
  • an RN attached UE may effectively see the L3 relay disappear in sub-frame i and i+2.
  • An unaware Rel-8 UE may attempt to interpolate the CRS in sub-frames i and i+1, i+1 and i+2, i+2 and i+3, .., where CRSs are only transmitted by the RN in sub-frame i+1. This may generate erroneous results if the Rel-8 UE does not know of an employed relaying solution.
  • an issue may arise when RN 100 is receiving data from the donor node 103, such that the RN 100 may not be able to simultaneously transmit data or control to attached UEs.
  • a rel-8 UE in the cell of the RN 100 that is unaware that the relaying scheme is being employed may attempt to interpolate a CRS in an all DL sub-frame. As a result, incorrect channel estimation by the UE may occur.
  • various example embodiments of the present invention utilize a TDD multicast/broadcast over single frequency network (MBSFN) relay UL-DL time slot configuration scheme.
  • MSSFN single frequency network
  • example embodiments of the present invention operate with respect to UL-DL pairings between time slots based on the configurations described in FIG. 1C. According to the timing described with respect to FIG. IB, pairing within a sub-frame of the different UL-DL configurations may be defined as further described below, where according to some example embodiments, the configuration number is referred to as the configuration with respect to the RN cell.
  • Various example embodiments of the present invention focus on the use of inband resources for the relay link in a TDD network, also referred to as the backhaul link, to provide an efficient solution for self-backhauling.
  • TDD UL DL time slot configuration for the donor cell and the RN, and the Rel-8 UE backwards compatibility aspects are considered and addressed by various example embodiments of the present invention.
  • Example embodiments of the present invention have no negative impacts on UL performance, and address near-far interference issues. Additionally, in some example embodiments, hybrid automatic repeat request (HARQ) aspects are also considered.
  • HARQ hybrid automatic repeat request
  • the donor node 103 and the RN 100 may communicate via the relay link 102 using a TDD UL-DL time slot configuration.
  • one DL sub-frame of the donor node 103 may be configured as an MBSFN sub-frame, and RN 100 may transmit data and control information to the donor node 103 in the last several symbols within the MBSFN sub- frame.
  • Time slots configured in this manner may be referred to as being in an [M D] configuration, since there is an MBSFN sub-frame in the cell of donor node 103 (represented by the "M"), and a DL sub-frame in the cell of RN 100 (represented by the "D").
  • one DL sub-frame for the RN 100 may be configured as an MBSFN sub-frame, and the donor node 103 may transmit data and control information to the RN 100 in the last several symbols within the MBSFN sub- frame.
  • Time slots configured in this manner may be referred to as being in an [D M] configuration, since there is a DL sub-frame for the cell of donor node 103 (represented by the "D"), and an MBSFN sub-frame in the cell of the RN 100 (represented by the "M").
  • FIG. 2 depicts an example configuration of time slots in accordance with various example embodiments of the present invention.
  • the sub-frames may be defined as "U” for an uplink sub-frame, "D” for a downlink sub- frame, "M” for an MBSFN sub-frame, or "S” for a special sub-frame.
  • FIG. 2 depicts a first configuration for both donor node cells and RN cells, e.g., with a DL-UL switching point of periodicity of 5 ms.
  • sub-frame #4 in RN cell may be configured as M, that is a MBSFN relay sub-frame, while in the donor node cell sub-frame #4 may be a D, that is a DL sub-frame.
  • sub-frame #9 may be configured for RN to donor node relay link transmissions. Accordingly, sub-frame #9 may be configured as an MBSFN sub-frame in the donor node cell, and kept as a DL sub-frame in the RN cell.
  • both UL and DL transmission for relay link may be performed by defining or redefining some DL sub-frames in the donor node cell or RN cell.
  • UL performance is not impacted, which is critical for some TDD UL-DL configurations where several downloads or downlinks are related to one upload or uplink.
  • control signaling e.g., physical downlink control channel (PDCCH) and physical HARQ indicator channel( PHICH)
  • CRS may be transmitted via the first 2 symbols in an MBSFN sub-frame, in some example embodiments, the configurations will not impact the UL HARQ process in the donor node cell or the RN cell.
  • the RN to donor node relay link transmission may be realized by configuring both Ds in the donor node and RN cells into Ms.
  • sub-frame #9 may be configured in the RN cell to be an MBSFN sub-frame, and therefore, RN may also transmit data and control information to the donor node cell in the last several symbols in the sub-frame.
  • an [M M] configuration (both donor node and RN cells use MBSFN sub- frame configuration) may be implemented.
  • An [M M] configuration may have no impact on the HARQ process in RN cell or the relay link.
  • a distinction with respect to an [M M] configuration may be that DL throughput in the RN cell may be impacted since no DL data transmission exists in the MBSFN sub-frame. Further, one direction transmission in an [M M] configuration may be performed since, in some example embodiments, no simultaneous transmissions may be performed from RN to UE when RN is transmitting to the donor node. In this regard, according to some example embodiments, interference with the donor node's reception in the later part of the M frame may be avoided in, for example an [M D] configuration, by not scheduling UEs in the corresponding D frame.
  • the Reference Symbols (RS) in the latter part of the D sub-frame may also impact the reception at the donor node, and configuring the M subframe may avoid interference with the reference symbols as well.
  • a blank sub-frame may be used instead of an MBSFN sub-frame, if the UEs support such a configuration.
  • baseline designs for TDD MBSFN relay UL-DL time slot configurations may also be considered with respect to backhaul (or relay) link HARQ.
  • a D sub-frame may be selected in the donor node or RN cell that may be configured as an M to enable backhaul link UL or DL transmissions.
  • TDD configuration #0 from FIG. 1C need not be used since sub-frame #0, 1, 5, and 6 need not be configured as an MBSFN sub-frame.
  • example baseline designs for TDD MBSFN relay UL-DL time slot configurations and backhaul link HARQ are described with respect to FIG. 3.
  • the baseline designs include one UL/DL backhaul link HARQ process for each TDD configuration.
  • sub-frame #4 and #9 may be paired for backhaul link configurations.
  • two different settings may be utilized.
  • sub-frame #4 is for the donor node to RN backhaul link, which means the donor node cell is configured as a "D" and the RN cell is configured as an "M” as shown in FIG. 2, and sub-frame #9 in this case is configured for a RN to donor node backhaul link, which is [M D] as shown in FIG. 2.
  • sub-frame #4 may be configured as an [M D]
  • sub-frame #9 may be configured as a [D M].
  • the feedback delay for either setting may be 5ms
  • HARQ round trip time (RTT) may be 10ms.
  • the baseline design for backhaul link HARQ may then be realized in that an acknowledge or negative acknowledge may be in the first available backhaul link sub- frame after 3ms, and DL/UL retransmission may be in the next DL/UL RN cell sub- frame.
  • an acknowledge or negative acknowledge may be in the first available backhaul link sub- frame after 3ms
  • DL/UL retransmission may be in the next DL/UL RN cell sub- frame.
  • pairing sub-frame #3 and #8 or pairing sub-frame #4 and #9 may provide similar HARQ RTT and feedback delay.
  • spare TDD MBSFN relay UL-DL time slot configurations and backhaul link HARQ designs may be considered.
  • spare sub-frames may be utilized.
  • the spare design may serve as a complementary design to the baseline configurations.
  • the spare designs may be available for TDD UL/DL configuration #2, #3, #4 and #5, which have more than two D sub- frames available to the backhaul link.
  • the spare sub-frame for the backhaul link is summarized in FIG 4.
  • the spare sub-frames listed in FIG. 4 may be configured for the backhaul link based on a rule set.
  • a spare sub-frame may be configured as either a donor node to RN or a RN to donor node backhaul transmission (e.g., according to traffic load status).
  • one more UL or DL HARQ process may be available to the backhaul link.
  • the HARQ for spare sub-frame may be structured such that the feedback of the HARQ process may reside in the first available backhaul link sub-frame after 3ms and/or the retransmission of this HARQ process may also occur in the spare sub-frame.
  • these and other aspects of the present invention make a relaying solution feasible to TDD UL/DL configuration #5, in addition to the other configurations.
  • TDD MBSFN relay UL-DL time slot configurations may be implemented based on the principles described above and otherwise described herein.
  • some baseline designs for backhaul link time slot configurations are provided.
  • a TDD UL-DL configuration for configuration #0 may not be feasible.
  • a TDD UL-DL configuration for configuration #1 may be separated into two settings. In a first setting, sub-frame #4 may be defined as a [D M] and sub-frame #9 may be defined as a [M D]. In a second setting, sub-frame #9 may be defined as a [D M] and sub-frame #4 may be defined as a [M D].
  • a TDD UL-DL configuration for configuration #2 may be separated into four settings.
  • sub-frame #3 may be defined as a [D M] and sub-frame #8 may be defined as a [M D].
  • sub-frame #8 may be defined as a [D M] and sub-frame #3 may be defined as a [M D].
  • sub-frame #4 may be defined as a [D M] and sub-frame #9 may be defined as a [M D].
  • sub-frame #9 may be defined as a [D M] and sub-frame #4 may be defined as a [M D].
  • a TDD UL-DL configuration for configuration #3 may be separated into two settings.
  • sub-frame #8 may be defined as a [D M] and sub-frame #9 may be defined as a [M D].
  • sub-frame #9 may be defined as a [D M] and sub-frame #8 may be defined as a [M D].
  • a TDD UL-DL configuration for configuration #4 may be organized similar to the TDD UL-DL configuration for configuration #1.
  • a TDD UL-DL configuration for configuration #5 may be organized similar to the TDD UL-DL configuration for configuration #2.
  • a TDD UL-DL configuration may include a first setting where sub-frame #9 in first 10ms may be defined as a [D M] and sub-frame #9 in next 10ms may be defined as a [M D].
  • an [M D] may also be configured as a [M M], which means that the RN cell may also have MBSFN sub-frame.
  • spare sub- frames may also be configured for the backhaul link.
  • One example configuration is given in FIG. 5. Accordingly, in addition to sub-frame #3 (in [M D]) pairing with sub-frame #8 (in [D M]), one spare sub-frame #9 may also be configured to [D M]. In this manner, the backhaul link will gain an additional DL HARQ process.
  • the spare sub-frame may be flexibly configured as [D M] or [M D] according to, for example, the backhaul link traffic load. According to various example embodiments, some available spare sub-frames for different TDD UL-DL configurations are shown in FIG. 4.
  • the HARQ for backhaul link may be designed such that acknowledgements and negative acknowledgements may be in the first available backhaul link sub-frame after 3ms, and DL or UL retransmission may be in the next DL or UL baseline relay sub-frame.
  • sub-frame #3 and #8 are configured as [D M] and [M D], respectively for TDD UL-DL configuration #5.
  • the UL feedback for sub-frame #3 may be in sub-frame #8, while the retransmission (e.g., if a negative acknowledgement is performed) may be in sub-frame #3 in the next 10ms.
  • the retransmission e.g., if a negative acknowledgement is performed
  • HARQ design may be generated such that the HARQ design for baseline backhaul configurations need not be impacted, the feedback of the DL or UL HARQ process may reside in the first available backhaul link UL or DL sub-frame after 3ms and the retransmission of this HARQ process may also occur in this spare sub-frame.
  • TDD configuration #4 is also shown in FIG. 7, in which sub-frame #4 plus sub-frame #9 are, for example, baseline configurations, and spare sub-frame #7 is also configured to be defined as a [D M] to give an additional backhaul DL HARQ process.
  • the HARQ designs for sub-frame #4 and sub-frame #9 need not be impacted (thus not shown in the figure for simplicity).
  • Sub-frame #7 may be utilized in the first 10ms and the UL feedback may be in sub-frame #9 in the second 10ms, while the corresponding re-transmission may be in sub-frame #7 of the third 10ms, if necessary.
  • FIG. 8 is a table describing various aspects of the present invention.
  • the table of FIG. 8 describes example embodiments with respect to baseline sub-frame parings for various TTD UL/DL configurations. With respect to the sub-frame parings, spare sub- frames for HARQ processes are also defined.
  • FIG. 9 illustrates another example embodiment of the present invention in the form of an example apparatus 300 that may be configured to perform various aspects of the present invention as described herein.
  • the apparatus 300 may be configured to perform the role of the relaying node 100, the donor node 103, or both.
  • the apparatus 300 may be configured to operate in accordance with the UE 101.
  • the apparatus 300 may be embodied as, or included as a component of, a communications device with wired or wireless communications capabilities.
  • Some examples of the apparatus 300 may include a base station, an access point (including a fempto-node), a computer, a server, a mobile terminal such as, a mobile telephone, a portable digital assistant (PDA), a pager, a mobile television, a gaming device, a mobile computer, a laptop computer, a camera, a video recorder, an audio/video player, a radio, and/or a global positioning system (GPS) device, a network entity, or any combination of the aforementioned, or the like.
  • a base station an access point (including a fempto-node)
  • PDA portable digital assistant
  • pager a pager
  • a mobile television such as, a mobile telephone, a portable digital assistant (PDA), a pager, a mobile television, a gaming device, a mobile computer, a laptop computer, a camera, a video recorder, an audio/video player, a radio, and/or a global positioning system (GPS) device,
  • apparatus 300 may be configured to implement various embodiments of the present invention as described herein including, for example, various exemplary methods of embodiments of the present invention, where the methods may be implemented by means of a hardware or computer program product configured processor, computer-readable medium, or the like.
  • the apparatus 300 may include or otherwise be in communication with a processor 305, a memory device 310, and a communications interface 315. In some embodiments, the apparatus 300 may also include a user interface 325 and a slot configuration manager 340.
  • the processor 305 may be embodied as various means including, for example, a microprocessor, a coprocessor, a controller, or various other processing devices including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), or a hardware accelerator.
  • the processor 305 may be configured to execute instructions stored in the memory device 310 or instructions otherwise accessible to the processor 305.
  • the processor 305 may represent an entity capable of performing operations according to embodiments of the present invention while configured accordingly.
  • the processor 305 when the processor 305 is embodied as an ASIC, FPGA or the like, the processor 305 may be specifically configured hardware for conducting the operations described herein.
  • the instructions when the processor 305 is embodied as an executor of software instructions, the instructions may specifically configure the processor 305, which may otherwise be a general purpose processing element if not for the specific configuration provided by the instructions, to perform the algorithms and operations described herein.
  • the processor 305 may be a processor of a specific device (e.g., a mobile terminal) adapted for employing embodiments of the present invention by further configuration of the processor 305 by instructions for performing the algorithms and operations described herein.
  • the memory device 310 may be a computer-readable storage medium that may include volatile and/or non- volatile memory.
  • memory device 310 may include Random Access Memory (RAM) including dynamic and/or static RAM, on-chip or off-chip cache memory, and/or the like.
  • RAM Random Access Memory
  • memory device 310 may include non- volatile memory, which may be embedded and/or removable, and may include, for example, read-only memory, flash memory, magnetic storage devices (e.g., hard disks, floppy disk drives, magnetic tape, etc.), optical disc drives and/or media, non-volatile random access memory (NVRAM), and/or the like.
  • Memory device 310 may include a cache area for temporary storage of data. In this regard, some or all of memory device 310 may be included within the processor 305.
  • the memory device 310 may be configured to store information, data, applications, computer-readable program code instructions, or the like for enabling the processor 305 and the apparatus 300 to carry out various functions in accordance with exemplary embodiments of the present invention.
  • the memory device 310 could be configured to buffer input data for processing by the processor 305.
  • the memory device 310 may be configured to store instructions for execution by the processor 305.
  • the communication interface 315 may be any device or means embodied in either hardware, a computer program product, or a combination of hardware and a computer program product that is configured to receive and/or transmit data from/to a network and/or any other device or module in communication with the apparatus 300.
  • Processor 305 may also be configured to facilitate communications via the communications interface by, for example, controlling hardware and/or software included within the communications interface 315.
  • the communication interface 315 may include, for example, one or more antennas, a transmitter, a receiver, a transceiver and/or supporting hardware, including a processor or software for enabling communications with network 320.
  • the apparatus 300 may communicate with various other network entities in a peer-to-peer fashion or via indirect communications via a base station, access point, server, gateway, router, or the like.
  • the communications interface 315 may be configured to provide for communications in accordance with any wired or wireless communication standard.
  • the communications interface 315 may be configured to support communications in multiple antenna environments, such as multiple input multiple output (MMO) environments. Further, the communications interface 315 may be configured to support orthogonal frequency division multiplexed (OFDM) signaling.
  • MMO multiple input multiple output
  • OFDM orthogonal frequency division multiplexed
  • the communications interface 315 may be configured to communicate in accordance with various techniques, such as, second-generation (2G) wireless communication protocols IS-136 (time division multiple access (TDMA)), GSM (global system for mobile communication), IS-95 (code division multiple access (CDMA)), third-generation (3G) wireless communication protocols, such as Universal Mobile Telecommunications System (UMTS), CDMA2000, wideband CDMA (WCDMA) and time division-synchronous CDMA (TD-SCDMA), 3.9 generation (3.9G) wireless communication protocols, such as Evolved Universal Terrestrial Radio Access Network (E-UTRAN), with fourth-generation (4G) wireless communication protocols, international mobile telecommunications advanced (EVIT-Advanced) protocols, Long Term Evolution (LTE) protocols including LTE-advanced, or the like.
  • 2G wireless communication protocols IS-136 (time division multiple access (TDMA)
  • GSM global system for mobile communication
  • IS-95 code division multiple access
  • third-generation (3G) wireless communication protocols such as Universal Mobile Telecommunications System (UMTS
  • communications interface 315 may be configured to provide for communications in accordance with techniques such as, for example, radio frequency (RF), infrared (IrDA) or any of a number of different wireless networking techniques, including WLAN techniques such as IEEE 802.11 (e.g., 802.11a, 802.11b, 802.1 Ig, 802. Hn, etc.), wireless local area network (WLAN) protocols, world interoperability for microwave access (WiMAX) techniques such as IEEE 802.16, and/or wireless Personal Area Network (WPAN) techniques such as IEEE 802.15, BlueTooth (BT), low power versions of BT, ultra wideband (UWB), Wigbee and/or the like.
  • RF radio frequency
  • IrDA infrared
  • WLAN techniques such as IEEE 802.11 (e.g., 802.11a, 802.11b, 802.1 Ig, 802. Hn, etc.), wireless local area network (WLAN) protocols, world interoperability for microwave access (WiMAX) techniques such as IEEE 802.16, and/
  • the user interface 325 may be in communication with the processor 305 to receive user input at the user interface 325 and/or to present output to a user as, for example, audible, visual, mechanical or other output indications.
  • the user interface 325 may include, for example, a keyboard, a mouse, a joystick, a display (e.g., a touch screen display), a microphone, a speaker, or other input/output mechanisms. In some exemplary embodiments, the user interface 325 may be limited, or even eliminated.
  • the slot configuration manager 340 of apparatus 300 may be any means or device embodied in hardware, a computer program product, or a combination of hardware and a computer program product, such as processor 305 implementing instructions or a hardware configured processor 305, that is configured to carry out the functions of slot configuration manager 340 as described herein.
  • the processor 305 may include, or otherwise control the slot configuration manager 340.
  • the slot configuration manager 340 may be embodied as one or more processors similar to, but separate from processor 305. In this regard, the slot configuration manager 340 may be in communication with processor 305.
  • the slot configuration manager 340 may reside on multiple apparatuses such that some or all of the functionality of the slot configuration manager 340 may be performed by a first apparatus, and the remainder of the functionality of the slot configuration manager 340 may be performed by one or more other apparatuses.
  • the slot configuration manager 340 may be configured to cause the apparatus 300 to receive or transmit backhauling or relaying communications in accordance with a baseline time slot pairing configuration as described above.
  • the slot configuration manager 340 may be configured to conduct communications within a relaying or backhauling link between a donor node and a relay node.
  • the communications of the relaying or backhauling link may be conducted in a TDD environment in accordance with identified UL-DL pairings.
  • at least one sub-frame time slot may be identified and treated as a MBSFN sub-frame timeslot to facilitate interference-free communications with respect to the relaying or backhauling link.
  • the slot configuration manager 340 may also be configured to analyze the communications received or otherwise identified as being attributed to the relaying or backhauling link. For example, the slot configuration manager 340 may be configured to analyze the communications to determine whether increased bandwidth, feedback, or re-transmission of data is needed in the relaying or backhauling link.
  • the slot configuration manager 340 may be configured to increase, or in some example embodiments decrease, the capacity of the relaying or backhauling link.
  • the capacity of the relaying or backhauling link may be increased based on the analysis by making at least one additional spare sub-frame available to the link or decreased by making at least one spare sub- frame unavailable to link.
  • the spare sub-frame may be determined with respect to the baseline time slot pairing configuration used by the apparatus 300 as described above.
  • the slot configuration manager 340 may be configured to cause the apparatus 300 to transmit, re-transmit, or receive relaying or backhauling communications.
  • transmission, re-transmission, or receipt of relaying or backhauling communications may be conducted during an additional spare sub-frame.
  • FIG. 10 illustrates one or more flowcharts of a system, method, and computer program product according to exemplary embodiments of the invention.
  • the flowcharts described by FIG. 10 may include, but need not require, one or more of the operations described with respect to FIG. 10. It will be understood that each block or operation of the flowcharts, and/or combinations of blocks or operations in the flowcharts, can be implemented by various means. Means for implementing the blocks or operations of the flowcharts, and/or combinations of the blocks or operations in the flowcharts may include hardware, and/or a computer program product including one or more computer program code instructions, program instructions, or executable computer- readable program code instructions.
  • one or more of the procedures described herein may be embodied by a computer program product including program code instructions.
  • the program code instructions may be stored by or on a memory device, such as memory device 310, of an apparatus, such as apparatus 300, and executed by a processor, such as the processor 305.
  • any such program code instructions may be loaded onto a computer or other programmable apparatus (e.g., processor 305, memory device 310) to produce a machine, such that the instructions which execute on the computer or other programmable apparatus create means for implementing the functions specified in the flowcharts block(s) or operation(s).
  • program code instructions may also be stored in a computer-readable storage medium that can direct a computer, a processor, or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including means which implement the function specified in the flowcharts' block(s) or operation(s).
  • the program code instructions may also be loaded onto a computer, processor, or other programmable apparatus to cause a series of operations to be performed on or by the computer, processor, or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer, processor, or other programmable apparatus implement the functions specified in the flowcharts' block(s) or operation(s).
  • blocks or operations of the flowcharts support combinations of means for performing the specified functions and program code instruction means for performing the specified functions. It will also be understood that one or more blocks or operations of the flowcharts, and combinations of blocks or operations in the flowcharts, can be implemented by special purpose hardware-based computer systems and/or processors which perform the specified functions or combinations of special purpose hardware and program code instructions.
  • FIG. 10 depicts a flowchart of an example method for time slot configuration including operations 400 through 430.
  • the example method includes receiving or transmitting relaying or backhauling communications in accordance with a baseline time slot pairing configuration.
  • the communications may be conducted within a relaying or backhauling link.
  • an analysis of communications received via the relaying or backhauling link may be conducted.
  • the capacity of the relaying or backhauling link may be increased or reduced by adding or removing spare sub-frames from the relaying or backhauling link communications.
  • relaying or backhauling communications may be transmitted, re-transmitted, or received via the relaying or backhauling link during an added spare sub-frame.

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

Abstract

La présente invention concerne divers procédés de configuration de créneaux, par exemple dans le contexte de communications implémentées avec une liaison terrestre ou une liaison relais. Un procédé donné à titre d'exemple consiste à établir une liaison terrestre entre un nœud donneur et un nœud relais et à réaliser des communications via la liaison terrestre selon des appariements de liaison montante-descendante de sous-trame de ligne de base. Pour cela, la ou les sous-trames dans les appariements de liaison montante-descendante de sous-trame de ligne de base peuvent être appliquées en multidiffusion à un appariement de sous-trame de liaison descendante. La présente invention concerne également des exemples de procédés similaires et associés ainsi que des exemples d'appareils.
PCT/IB2010/000286 2009-02-16 2010-02-15 Procédé, appareil et produit-programme informatique pour la configuration de créneaux Ceased WO2010092474A1 (fr)

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US61/152,936 2009-02-16

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CN108055115B (zh) * 2018-01-08 2020-08-04 西安电子科技大学 分布式tdma协议中的时隙组调度方法

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