WO2013139041A1 - Procédé et appareil d'attribution de ressources dispositif-à-dispositif - Google Patents

Procédé et appareil d'attribution de ressources dispositif-à-dispositif Download PDF

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Publication number
WO2013139041A1
WO2013139041A1 PCT/CN2012/072971 CN2012072971W WO2013139041A1 WO 2013139041 A1 WO2013139041 A1 WO 2013139041A1 CN 2012072971 W CN2012072971 W CN 2012072971W WO 2013139041 A1 WO2013139041 A1 WO 2013139041A1
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WO
WIPO (PCT)
Prior art keywords
cellular
resources
allocation
resource
band
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Application number
PCT/CN2012/072971
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English (en)
Inventor
Zhenhong Li
Tao Chen
Wei Zou
Haifeng Wang
Samuli Heikki TURTINEN
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Renesas Mobile 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.)
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Publication date
Application filed by Renesas Mobile Corporation filed Critical Renesas Mobile Corporation
Priority to PCT/CN2012/072971 priority Critical patent/WO2013139041A1/fr
Publication of WO2013139041A1 publication Critical patent/WO2013139041A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • An example embodiment relates generally to communications technology and, more particularly, to methods, apparatus and computer program products for facilitating network channel resource allocation from a network entity to device-to-device (D2D) user equipment (UE).
  • D2D device-to-device
  • UE user equipment
  • next-generation wireless communication systems that will bring higher data rates and system capacity to end users and network operators.
  • next generation systems are 3GPP (Third Generation Partnership Project) Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX).
  • LTE Long Term Evolution
  • WiMAX Worldwide Interoperability for Microwave Access
  • LTE D2D device to device
  • LTE-Advanced (LTE-A) resource allocation operates fast and in a high time-frequency resolution. This provides opportunities for using either the un-allocated resource or reusing the cellular resource for D2D communications. Reusing the cellular resource is not guaranteed as the cellular user equipment (UE) should always be the primary UEs on the licensed cellular band.
  • UE user equipment
  • LTE technology usage on shared industrial/science/medicine (ISM) bands can provide: 1) new markets to LTE technology based radio systems; 2) additional capacity to cellular system operation; and 3) new applications and communication solutions using LTE modem technology such as wireless machine to machine (M2M) and D2D communications. Therefore, although most recent research work assumes that LTE D2D should be operated on the licensed bands to guarantee a controlled interference environment, the benefits of using license-exempt bands in addition to the licensed band, such as the 2.4 GHz ISM band, to perform LTE D2D communication are significant and the solutions in that direction have not been sufficiently taken into account.
  • ISM industrial/science/medicine
  • D2D resource allocation there are two methods for D2D resource allocation under the control of the cellular networks.
  • One is dedicated cellular resource allocation while the other one is reuse of the cellular resource.
  • dedicated resource allocation can lead to the inefficient use of the available cellular resource.
  • the uplink (UL) and downlink (DL) scheduling grants are sent from a network node (eNB) to UE in the DL control channel for cellular UEs.
  • eNB network node
  • both the transmitting and receiving devices need to know the explicit resource allocation in order to decode the data packet which is transmitted on the assigned resource blocks.
  • the explicit resource allocation by eNB consumes the DL control signaling significantly.
  • Each new downlink control interface (DCI) format size that needs to be monitored simultaneously with existing DCI formats multiplies the number of blind decoding attempts. For example, monitoring three DCI formats in UE-specific search space instead of two would mean 48 attempts from UE-specific search space per component carrier. And adding more DCI formats makes the situation even worse.
  • DCI downlink control interface
  • the resource is explicitly allocated by the network dynamically in the same way as for cellular UEs, the DL control channel (e.g. physical downlink control channel (PDCCH)) burden increases significantly.
  • the DL control channel e.g. physical downlink control channel (PDCCH)
  • more DCI formats for D2D resource allocation introduce extra complexity in terms of decoding attempts for the UE. Therefore how to design an efficient resource allocation method for D2D UEs in the cellular band and in a shared band (e.g., ISM band) and minimize the impact on the current cellular system is an important issue to be solved when D2D UE is acting as a secondary user in the cellular band.
  • a shared band e.g., ISM band
  • the allocating may be performed by a network entity, such as a radio network controller (RNC), an evolved node B (eNB), a base station, a home eNB, a relay node, or an access point (AP) employing one or more of a Long Term Evolution (LTE) resource restriction scheme or a reusable resource allocation scheme for resource scheduling.
  • RNC radio network controller
  • eNB evolved node B
  • AP access point
  • the allocation may be based on determining an allocation of cellular resources to D2D UE based on interference measurements performed in the cellular resource channels.
  • LTE Long Term Evolution
  • the method may include causing transmission of semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel in the form of a bitmap table of cellular resources wherein the bitmap table is a matrix of physical resource blocks (PRBs) and transmission time intervals (TTI).
  • SPS semi-persistent scheduling
  • the method may further comprise causing transmission of a cell specific bitmap table in a control channel in every TTI.
  • the method may include causing ISM band availability information to be sent periodically in a downlink control channel, shifting the ISM channel resources to avoid interference on the ISM band and canceling D2D communication in an instance wherein there is overlapping between D2D UE on-demand resource allocation in the ISM band.
  • the network entity may cause indicators of resource shifting, resource expansion and resource cancellation in the ISM band to be sent in periodic downlink control channel messages wherein UE multiplexing on the ISM band could be accomplished directly without explicit direction signaling when the ISM band is available, and include an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal such that UE can easily determine whether it is necessary to process the allocation data.
  • a method for D2D UE to receive resource allocations is provided wherein the UE receives communications channel resource allocation to device-to-device (D2D) user equipment (UE), the allocations being based on interference measurements performed in physical resource blocks comprising the cellular channels.
  • D2D device-to-device
  • the measurements may be performed by the UE and reported to a network entity in an uplink (UL) interval.
  • the method may further comprise receiving semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel, wherein the SPS information is in the form of a bitmap table of cellular resources, and receiving a cell specific bitmap table in a control channel in every TTI.
  • SPS semi-persistent scheduling
  • the method may further comprise receiving ISM band availability information periodically in a downlink control channel and may include receiving an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal.
  • an apparatus for wireless network control comprising at least one processor, and at least one memory including computer code arranged to, with the processor, cause the apparatus at least to allocate communications channel resources to device-to-device (D2D) user equipment (UE), wherein the allocation is made from one or more of cellular band resources and shared industrial/scientific/medicine (ISM) band resources.
  • the computer program code may be arranged to cause the apparatus at least to allocate cellular channel resources to D2D UE based on interference measurements performed in physical resource blocks comprising the cellular channels.
  • the apparatus may further cause transmission of scheduling information in the downlink (DL) control channel, transmit semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel, transmit the SPS information in the form of a bitmap table of cellular resources forming the bitmap table as a matrix of physical resource blocks (PRBs) and transmission time intervals (TTI).
  • the apparatus may further comprise computer code arranged to, with the processor, cause the apparatus at least to transmit a cell specific bitmap table in a control channel in every TTI, determine allocation of cellular resources to D2D UE based on interference measurements performed in the cellular resource channels, determine that there is insufficient availability of cellular resources for D2D communication, and send ISM band availability information periodically in a downlink control channel.
  • the apparatus may further comprise computer code arranged to, with the processor, cause the apparatus at least to shift the ISM channel resources to avoid interference on the ISM band, cancel D2D communication in an instance wherein there is overlapping between D2D UE on-demand resource allocation in the ISM band, and may cause indicators of resource shifting, resource expansion and resource cancellation in the ISM band to be sent in periodic downlink control channel messages wherein UE multiplexing on the ISM band could be accomplished directly without explicit direction signaling when the ISM band is available, and include an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal such that UE can easily determine whether it is necessary to process the allocation data.
  • an apparatus for a wireless mobile terminal includes at least one processor, and at least one memory including computer code arranged to, with the processor, cause the apparatus at least to receive communications channel resource allocation to device-to-device (D2D) user equipment (UE).
  • D2D device-to-device
  • UE user equipment
  • the allocation may be made from one or more of cellular band resources and shared industrial/scientific/medicine (ISM) band resources.
  • ISM industrial/scientific/medicine
  • the apparatus may be further arranged to, with the processor, cause the apparatus at least to receive cellular channel resource allocations to D2D UE based on interference measurements performed in physical resource blocks comprising the cellular channels, perform said interference measurements and report them to a network entity in an uplink (UL) interval, receive semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel, and receive a cell specific bitmap table in a downlink control channel in every TTI.
  • UL uplink
  • SPS semi-persistent scheduling
  • the apparatus may be further arranged to, with the processor, cause the apparatus at least to receive ISM band availability information periodically in a downlink control channel in an instance when it has been determined that there is insufficient availability of cellular resources for D2D communication, and receive an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal.
  • a computer readable medium includes a set of program instructions, which, when executed on a communications network entity cause it allocate communications channel resources to device-to-device (D2D) user equipment (UE), wherein the allocation is made from one or more of cellular band resources and shared industrial/scientific/medicine (ISM) band resources.
  • D2D device-to-device
  • UE user equipment
  • the network entity may be one of a radio network controller (RNC), an evolved node B (eNB), a base station, a home eNB, a relay node, or an access point (AP).
  • the computer-readable program instructions may further cause the network entity to perform the steps of employing one or more of a Long Term Evolution (LTE) resource restriction scheme or a reusable resource allocation scheme for resource scheduling.
  • LTE Long Term Evolution
  • the allocation may be based on determining an allocation of cellular channel resources to D2D UE based on interference measurements performed in physical resource blocks comprising the cellular channels.
  • the program instructions may include causing transmission of semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel, and transmission of a cell specific bitmap table in a control channel in every TTI.
  • SPS semi-persistent scheduling
  • the computer-readable program instructions may further cause the network entity to determine that there is insufficient availability of cellular resources for D2D communication, it may include causing ISM band availability information to be sent periodically in a downlink control channel, shifting the ISM channel resources to avoid interference on the ISM band, canceling D2D communication in an instance wherein there is overlapping between D2D UE on-demand resource allocation in the ISM band.
  • the program instructions may further cause indicators of resource shifting, resource expansion and resource cancellation in the ISM band to be sent in periodic downlink control channel messages wherein UE multiplexing on the ISM band could be accomplished directly without explicit direction signaling when the ISM band is available, and including an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal such that UE can easily determine whether it is necessary to process the allocation data.
  • a further embodiment may be a computer readable medium comprising a set of program instructions, which, when executed on device-to-device (D2D) user equipment (UE) cause a UE to receive an allocation of communications channel resources to D2D UE, the allocation being made from one or more of cellular band resources and shared industrial/scientific/medicine (ISM) band resources.
  • the program instructions may further cause a UE to perform interference measurements in physical resource blocks comprising the cellular channels and report them to a network entity in an uplink (UL) interval.
  • the instructions may further cause a UE to receive semi- persistent scheduling (SPS) information for the cellular band in a downlink control channel, and receive a cell specific bitmap table in a downlink control channel in every TTI.
  • SPS semi- persistent scheduling
  • the computer readable medium program instructions may further cause D2D UE to perform the steps of receiving ISM band availability information periodically in a downlink control channel in an instance when it has been determined that there is insufficient availability of cellular resources for D2D communication, and receive an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal.
  • Another embodiment may include an apparatus for wireless network control comprising means, such as a network node configured with a processor and communications interface, for allocating communications channel resources to device-to- device (D2D) user equipment (UE), with one allocation being made from one or more of the cellular band resources or the shared ISM band resources.
  • means such as a network node configured with a processor and communications interface, for allocating communications channel resources to device-to- device (D2D) user equipment (UE), with one allocation being made from one or more of the cellular band resources or the shared ISM band resources.
  • D2D device-to- device
  • UE user equipment
  • the apparatus may also include means such as a processor and communications interface for allocating cellular channel resources to D2D UE based on interference measurements performed in physical resource blocks comprising the cellular channels, means for causing transmission of semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel, means such as a communications interface for causing transmission of a cell specific bitmap table in a control channel in every TTI, means for causing transmission of semi-persistent scheduling (SPS) information for the cellular band in a downlink control channel, and means for causing transmission of a cell specific bitmap table in a control channel in every TTI.
  • SPS semi-persistent scheduling
  • the apparatus may also comprise means such as a processor for determining that there is insufficient availability of cellular resources for D2D communication, means such as a communications interface and processor for sending ISM band availability information periodically in a downlink control channel, means such as a communications interface for sending indicators of resource shifting, resource expansion and resource cancellation in the ISM band in periodic downlink control channel messages wherein UE multiplexing on the ISM band could be accomplished directly without explicit direction signaling when the ISM band is available, and means such as a processor and communications interface for including an indicator bit in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal such that UE can easily determine whether it is necessary to process the allocation data.
  • a processor for determining that there is insufficient availability of cellular resources for D2D communication means such as a communications interface and processor for sending ISM band availability information periodically in a downlink control channel, means such as a communications interface for sending indicators of resource shifting, resource expansion and resource cancellation in the ISM band in periodic downlink control channel messages wherein UE multiplexing on the
  • Another embodiment can be an apparatus for a wireless mobile terminal comprising means for receiving communications channel resource allocation to device- to-device (D2D) user equipment (UE),with the allocation being made from one or more of cellular band resources or shared ISM resources.
  • the apparatus may also include means such as a processor and communications interface for causing interference measurements to be performed on cellular resources, means such as a communications interface for causing the results to be reported to a network entity in an uplink (UL) interval, means such as a communications interface for causing semi-persistent scheduling (SPS) information for the cellular band to be received in a downlink control channel, means for causing a cell specific bitmap table to be received in a control channel in every TTI.
  • SPS semi-persistent scheduling
  • the apparatus may further comprise means such as a processor and communications interface for causing ISM band availability information to be received periodically in a downlink control channel, and means such as a communications interface for causing an indicator bit to be received in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal.
  • means such as a processor and communications interface for causing ISM band availability information to be received periodically in a downlink control channel, and means such as a communications interface for causing an indicator bit to be received in resource allocation signaling to indicate whether the allocation has changed since the previous downlink allocation signal.
  • FIG. 1 is a schematic diagram of an embodiment of a wireless network
  • FIG. 2 is a schematic diagram of an embodiment of a mobile terminal
  • FIG. 3 is a flow diagram of an example embodiment of the method of the invention.
  • Fig. 4 is a table illustrating cellular resource availability;
  • Fig. 5 a is a table illustrating allocated and un-allocated cellular channel
  • . 5b is a table illustrating allocation of cellular resources to D2D UEs; and . 6 is a table illustrating recourse to ISM band.
  • circuitry refers to all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) to combinations of circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of processor(s)/software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) to circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry applies to all uses of this term in this application, including in any claims.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or application specific integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.
  • a method, apparatus and computer program product are described for providing communications channel resources to device-to-device (D2D) user equipment (UE) for wireless network communications.
  • a network element makes interference measurements of the physical resource blocks (PRBs) in cellular network resources or receives interference measurement reports from D2D UE. Based on these reports and on known resource allocations to cellular UE, the network element determines which cellular PRBs can be allocated to and reused by D2D UE.
  • the network element which may be a base station, and evolved node B (eNB), a relay node, an access point or the like, then periodically transmits a semi-persistent resource allocation bitmap to D2D UE in a downlink control channel.
  • eNB evolved node B
  • a specific channel allocation bitmap is transmitted in each transmission time interval (TTI) advising D2D UE which PRB is assigned to particular D2D UE in each TTI. If the network element determines that insufficient cellular channel resources are available for D2D use it may allocate portions of the shared industrial/scientific/medicine (ISM) channel to D2D UE. In any instance, the network element may include an indicator bit in each allocation transmission to enable the UE to determine if there has been a change in the channel allocations since the last bitmap transmission.
  • TTI transmission time interval
  • FIG. 1 includes a mobile terminal 10 that is capable of communication with a network 14 (e.g., a core network) via, for example, an radio network controller (RNC) 12.
  • a network 14 e.g., a core network
  • RNC radio network controller
  • the network may be configured in accordance with a Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN)
  • UMTS Universal Mobile Telecommunications System
  • UTRAN Universal Mobile Telecommunications System
  • LTE-A LTE-Advanced
  • W-CDMA wideband code division multiple access
  • CDMA2000 Code Division Multiple Access 2000
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • the network 14 may include a collection of various different nodes, devices or functions that may be in communication with each other via corresponding wired and/or wireless interfaces.
  • the network may include one or more base stations, such as one or more node Bs, evolved node Bs (eNBs), access points, relay nodes or the like, each of which may serve a coverage area divided into one or more cells.
  • the network may include one or more cells, including a serving cell including, for example, the RNC 12 and one or more neighbor cells 16 (designated neighbor cell 1, neighbor cell 2,...neighbor cell n in the embodiment of FIG. 1), each of which may serve a respective coverage area.
  • the serving cell and the neighbor cells could be, for example, part of one or more cellular or mobile networks or public land mobile networks (PLMNs).
  • PLMNs public land mobile networks
  • processing devices e.g., personal computers, server computers or the like
  • the mobile terminal and/or the second communication device via the network.
  • the mobile terminal 10 may be in communication with each other or other devices via the network 14.
  • each of the communication terminals may include an antenna or antennas for transmitting signals to and for receiving signals from a base station.
  • the mobile terminal 10 also known as user equipment (UE)
  • UE may be a mobile communication device such as, for example, a mobile telephone, portable digital assistant (PDA), pager, laptop computer, table computer, or any of numerous other hand held or portable communication devices, computation devices, content generation devices, content consumption devices, universal serial bus (USB) dongles, data cards or combinations thereof.
  • the mobile terminal 10 may include one or more processors that may define processing circuitry either alone or in combination with one or more memories.
  • the processing circuitry may utilize instructions stored in the memory to cause the mobile terminal to operate in a particular way or execute specific functionality when the instructions are executed by the one or more processors.
  • the mobile terminal 10 may also include communication circuitry and corresponding hardware/software to enable communication with other devices and/or the network 14.
  • the mobile terminal 10 and a network entity, such as an RNC 12, may implement an example embodiment of the method, apparatus and computer program product in order to provide for an improved channel allocation procedure, such as allocation of cellular channel resources to D2D UE.
  • the mobile terminal 10 and a network entity, such as the RNC 12 may each embody or otherwise be associated with an apparatus 20 that is generally depicted in FIG. 2 and that may be configured in accordance with an example embodiment of the present invention as described below, such as described in connection with Figs. 3-6 below.
  • the components, devices or elements described below may not be mandatory and thus some may be omitted in certain embodiments. Additionally, some embodiments may include further or different components, devices or elements beyond those shown and described herein.
  • the apparatus 20 may include or otherwise be in communication with a processing system including, for example, processing circuitry 22 that is configurable to perform actions in accordance with an example embodiment described herein.
  • the processing circuitry 22 may be configured to perform data processing, application execution and/or other processing and management services according to an example embodiment of the present invention.
  • the apparatus or the processing circuitry 22 may be embodied as a chip or chip set.
  • the apparatus or the processing circuitry may comprise one or more physical packages (e.g., chips) including materials, components and/or wires on a structural assembly (e.g., a baseboard).
  • the structural assembly may provide physical strength, conservation of size, and/or limitation of electrical interaction for component circuitry included thereon.
  • the apparatus or the processing circuitry 22 may therefore, in some cases, be configured to implement an embodiment of the present invention on a single chip or as a single "system on a chip.”
  • a chip or chipset may constitute means for performing one or more operations for providing the functionalities described herein.
  • the processing circuitry 22 may include a processor 24 and memory 28 that may be in communication with or otherwise control a communication interface 26 and, in some cases in which the apparatus is embodied by the mobile terminal 10, a user interface 30.
  • the processing circuitry 22 may be embodied as a circuit chip (e.g., an integrated circuit chip) configured (e.g., with hardware, software or a combination of hardware and software) to perform operations described herein.
  • the processing circuitry may be embodied as a portion of mobile terminal 10 or the network entity 12.
  • the user interface 30 (if implemented in embodiments of the apparatus 20 embodied by the mobile terminal 10) may be in communication with the processing circuitry to receive an indication of a user input at the user interface and/or to provide an audible, visual, mechanical or other output to the user.
  • the user interface 30 may include, for example, a keyboard, a mouse, a joystick, a display, a touch screen, a microphone, a speaker, and/or other input/output mechanisms.
  • the user interface includes user interface circuitry configured to facilitate at least some functions of the user equipment by receiving user input and providing output.
  • the communication interface 26 may include one or more interface mechanisms for enabling communication with other devices and/or networks.
  • the communication interface 26 may be any means such as a device or circuitry embodied in either hardware, or a combination of hardware and software that is configured to receive and/or transmit data from/to a network 14 and/or any other device or module in communication with the processing circuitry, such as between the mobile terminal 10 and a network entity, such as an RNC 12.
  • the communication interface may include, for example, an antenna (or multiple antennas) and supporting hardware and/or software for enabling communications with a wireless communication network and/or a communication modem or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB), Ethernet or other methods.
  • DSL digital subscriber line
  • USB universal serial bus
  • the memory 28 may include one or more non- transitory memory devices such as, for example, volatile and/or non-volatile memory that may be either fixed or removable.
  • the memory 28 may be configured to store information, data, applications, instructions or the like for enabling the apparatus 20 to carry out various functions in accordance with example embodiments of the present invention.
  • the memory 28 could be configured to buffer input data for processing by the processor 24.
  • the memory could be configured to store instructions for execution by the processor.
  • the memory may include one of a plurality of databases that may store a variety of files, contents or data sets. Among the contents of the memory, applications may be stored for execution by the processor in order to carry out the functionality associated with each respective application.
  • the memory 28 may be in communication with the processor via a bus for passing information among components of the apparatus.
  • the processor 24 may be embodied in a number of different ways.
  • the processor may be embodied as various processing means such as one or more of a microprocessor or other processing element, a coprocessor, a controller or various other computing or processing devices including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), or the like.
  • the processor 24 may be configured to execute instructions stored in the memory 28 or otherwise accessible to the processor.
  • the processor may represent an entity (e.g., physically embodied in circuitry - in the form of processing circuitry) capable of performing operations according to an embodiment of the present invention while configured accordingly.
  • the processor 24 when the processor 24 is embodied as an ASIC, FPGA or the like, the processor may be specifically configured hardware for conducting the operations described herein.
  • the processor when the processor is embodied as an executor of software instructions, the instructions may specifically configure the processor to perform the operations described herein.
  • Cell specific resource allocation restriction or the reusable resource allocation for D2D communication are scheduled for all D2D UE devices commonly by the eNB or the like in the common search space transmission time interval (TTI) specifically or semi persistently.
  • the resource allocation may be scheduled utilizing, e.g., LTE resource allocation schemes like resource allocation type 0, 1 , or 2.
  • LTE resource allocation schemes like resource allocation type 0, 1 , or 2.
  • PRB Physical Resource Blocks
  • the granularity of the bitmapping may be configurable. The minimum granularity is one bit per resource unit.
  • the resource allocation information corresponds to the amount of physical uplink shared channel (PUSCH) resource blocks within the UL channel bandwidth.
  • PUSCH physical uplink shared channel
  • the scheduling information (e.g., the resource allocation restriction or the reusable resource allocation information) is transmitted in the DL control channel with common RNTI for all D2D devices (D2D-RNTI) in the common search space.
  • D2D-RNTI common RNTI for all D2D devices
  • the RNTI may be common for a certain D2D group wherein the group consists of at least one D2D pair/cluster. "1" represents that D2D UE can't reuse that resource block; "0” means that D2D UE is able to (re)use that resource block, or vice versa.
  • D2D UEs monitor both the semi-persistent scheduling information (for the possible changes on those) and the cell specific scheduling information (resource restriction/reuse information) to obtain the eventual resource allocation for D2D communication on cellular band.
  • D2D UE devices preserve a table of their scheduling allocations within the corresponding communication channel. The table can be a bitmap wherein one bit indicates a resource block or the like.
  • D2D UE devices can derive the resources they may utilize for communication purposes by combining the SPS scheduling information and the cell specific scheduling information (e.g., with XOR operation). If the cell specific scheduling information is not transmitted in the TTI of the DL corresponding to the TTI of UL (e.g., relation n+4), D2D UE devices apply the SPS scheduling information.
  • the bitmap/resource table is carrier (or cell) specific.
  • the scheduling information can be sent via the PDCCH of each serving cell or with the cross-carrier scheduling from a certain serving cell.
  • D2D UE pairs with mutual interference can be scheduled on the different carriers to avoid co-channel interference.
  • the bitmap for the unlicensed band may not need to be updated every TTI assuming (semi-)static changes on the interference of the unlicensed band.
  • the reusable resource bitmap for the unlicensed band can be valid for a while unless there is any updating. So a toggle bit in the PDCCH can be added to indicate whether it is new bitmap or a previously provided bitmap.
  • D2D UE can skip the detection to save the processing power. If it is a new bitmap, the D2D UE would update the bitmap in the memory. This method is also applicable for the unlicensed band or even to the dedicated D2D resource due to the uplink resource restrictions.
  • D2D traffic communication occurs on the ISM shared band or on the cellular band via reusing strategy; if the reusing is possible, then there is no need to operate on the ISM shared band;
  • D2D communication is under network control in a centralized manner.
  • Cellular UE is scheduled every TTI typically in LTE system;
  • the 22MHz (which is dependent on the IEEE frequency regulation) ISM could be shared by D2D UEs (i.e., frequency domain UE multiplexing).
  • the method of proposed resource allocation for D2D UE reusing the cellular resource or using the ISM can be modeled as follows.
  • D2D UE makes the cellular interference measurements and reports the necessary interference measurements 50 to a control unit, which could be eNB, home eNB or AP or the like on the cellular band and the ISM band. Or in an alternative way, Home eNB or AP itself could make the interference measurement on the ISM band. Most likely, the AP/Home eNB or any control unit could maintain the ISM band channel availability information.
  • the eNB makes the decision 52 about which cellular UEs are interfering with D2D UE according to the pre-defined interference threshold and the measurement report from UE: a.
  • D2D UE shall report either the interference levels of the cellular UE(s) to D2D UE or the list of the cellular UE(s) whose resource could be reused with D2D UE; b. If UE makes the final decision of the interfering cellular UEs, UE shall only report the list of the cellular UE(s) whose resource could be (could not be) reused with D2D UE.
  • the maximum number of the reusable cellular UEs can be predefined and configurable.
  • the eNB sends the (semi-)persistent resource assignment to D2D UE 54 to pre-allocate a part of resources for D2D UE (e.g., reusable resources).
  • a new (semi-) persistent assignment could be sent to overwrite the old one if needed.
  • the (semi-) persistent resource assignment reflects several considerations for each PRB : a) regarding the interference situation: this part of the cellular resource could be reused by D2D UE; b) this part of the resource assignment statically satisfies the D2D UE's quality of signal (QoS); c) the (semi-) persistent resource allocation signaling could be carried on layerl, layer2 or layer3.
  • the D2D UE monitors the (semi-)persistent resource allocation to obtain the reusable cellular UE's resource.
  • the eNB broadcasts the cell specific bitmapping table in common space 56 with common ID to D2D UEs in every TTI according to the cellular UE's resource allocation situation (The bitmapping detail is explained hereafter).
  • the D2D UE monitors the cell specific bitmapping table in the common space and checks if the cellular UE's resource which is pre-allocated for D2D UE via (semi-) persistent resource assignment could be reused or not 58 in every TTI.
  • the D2D UE monitors the UE specific ISM band resource allocation in the control channel periodically 62. If the cellular resource can not be reused by D2D UE or can only be reused partially, then the ISM band resource could be considered to be used 64.
  • Figure 4 illustrates an example of the cellular UEs' resource allocation.
  • Cellular UE' s resource is scheduled in every TTI.
  • the minimum resource unit in time and frequency domain is 1 PRB and 1 TTI, respectively.
  • the scheduling period is 1 TTI.
  • cellular UE#1 CI
  • C2, C3, C4 and C5 are scheduled.
  • CI, C2, C3 and C4 are scheduled at TTI#2.
  • the scheduling operation occurs in every TTI (dynamic scheduling)
  • the resource assignment for a certain UE may not change very dynamically in every TTI in terms of number and index of PRBs due to the limited UE specific CQI report.
  • CQI reporting is scheduled in every 5 TTI or even longer period in the uplink direction. It is possible that a certain UE is not scheduled in every TTI according to its priority. In some cases, if system load is not very heavy, some PRBs may not be scheduled to any UEs.
  • Figure 1 reflects the practical resource allocation strategy in current LTE system.
  • FIGs 4 to 5b depict how D2D UEs reuse the cellular resource from the scheduling signaling point of view.
  • Cn is the cellular channel resource (CI, C2, etc.)
  • PRBs physical resource blocks
  • C1-C5 represent five cellular channels allocated over six (6) physical resource blocks (PRBs), which are frequency channels divided into transmission time intervals (TTIs). Some of these resources may be allocated but unused.
  • the PRB allocation indicates by the "1" in any PRB that certain PRBs are allocated to the cellular network; the "0" indicator means that those PRBs are unused in that TTI and available for resource re-allocation (and re-use).
  • the eNB makes the below decision:
  • D2D UE (Dl) could reuse with C3 and C4's resource: PRB#2-3 in TTI#1 ;
  • D2D UE could reuse with CI and C2's resource: PRB#4-6 in TTI#1 ;
  • D2D UE could reuse with C5's resource: PRB#1 in TTI#1;
  • D2D UE may send this information to D2D UE at the TTI#1 as described above.
  • D2D UE monitors the downlink control information.
  • D2D UE obtains its own resource assignment and starts to reuse the allocated cellular resource accordingly. See Fig. 5b which reflects that Dl has been allocated PRB#2 and PRB#3 in TTI#1 ; D2 is allocated PRB#4-6 in TTI#1 ; and D3 is allocated PRB#1 in TTI#1.
  • eNB may send a cell specific bit mapping table as in Figure 5b to D2D UE.
  • D2D UE detects the bitmapping table in common space, each D2D device (Dl, D2, D3) determines its own reusable resource in conjunction with the semi-persistent allocations at TTI#1.
  • Dl knows that its re-usable resource allocation is PRB#2 & 3 based on the received reusable list at TTI#1 (Fig. 5b).
  • Dl receives the bitmapping table (Fig. 5a) at TTI#2, both PRB#2& PRB#3 are marked with "0". That indicates that cellular interference to Dl on those PRBs is in tolerant range, so Dl could then reuse that part of the resource.
  • this interference indication table number and index of the possible reusable PRBs are implicitly indicated.
  • eNB there is no need for eNB to send the extra UE specific resource allocation signaling to D2D UEs.
  • D2D UE could also save the potential decoding attempts.
  • D2D UE is still aware of the explicit cellular resource scheduling information based on the proposed bitmapping table. If the cellular resource cannot be used, then the D2D communication on the ISM band could be initiated based on the latest ISM channel availability information and sensing result.
  • the cell specific bitmapping table implicitly includes the D2D UE's resource assignment information.
  • the size of the cell specific bitmapping table is dependent on the system bandwidth (5 MHz, lOMhz, 15Mhz and 20 MHz etc) and the resource scaling.
  • the minimum resource unit is one PRB including 12 sub-carriers.
  • D2 knows that its reusable resource allocation is PRB#4-6 based on the received reusable list at TTI#1.
  • D2 receives the bitmapping table (Fig. 5a) at TTI#2, both PRB#5-6 are marked with "0" and PRB#4 is marked with "1". That means that cellular interference to D2 on PRB#5-6 is in tolerant range and intolerant on PRB#4. That is, D2 could reuse PRB#5&6 and D2 may not reuse PRB#4. This case represents partial reuse of the cellular band.
  • D2 knows that its reusable resource allocation is PRB#4-6 based on the received reusable list at TTI#1.
  • PRB#4-6 are marked with "1", i.e., cellular interference to D2 on those PRBs is in intolerant range. Therefore, D2 cannot reuse those PRBs at all. So D2 is not able to make the transmission at TTI#5. This case represents the no reuse instance.
  • D2D UE In the instance in which there is only D2D transmission, if eNB does not schedule any cellular user on the resources pre-allocated for the D2D UE, D2D UE is actually using the dedicated resources as a primary user for D2D communication. In this case, the corresponding bits in the bitmap are also marked as "0". At TTI#7 and TTI#8, PRB#3 is not scheduled to any cellular UEs, thus D5 can use that part of dedicated cellular resource for D2D communication.
  • eNB could also check the corresponding interference level based on the available measurement report during the scheduling operation and then make the proper decision on those PRBs.
  • the reusable rate could be increased certainly instead of fixing the reusable cellular UE list.
  • those PRBs marked with "?” in Fig. 5b and a blank in the resource mapping table in Figure 4 could also possibly be reused.
  • the ISM band could be utilized for D2D communication. For example, if at least half of the needed resource for D2D UE cannot be obtained by reusing the cellular resource, then operation on the shared ISM band for D2D data traffic communication could be initiated.
  • Scaling the bandwidth of the shared band to the cellular bandwidth could be done beforehand as the content of the system information. For example, assuming 22MHz in the shared band, one may map the 22MHz to 20MHz or 10MHz in a flexible way.
  • eNB may determine that the ISM band may need to be used.
  • eNB can send the ISM channel availability information to the D2D UE periodically, such as every 10ms in the control channel.
  • the eNB has allocated the unused cellular resources to Dl , D2 and D3 through TTI#4.
  • TTI#5 eNB has no cellular resource available for D2, for instance, because cellular UE (C6, CI) are using PRB#2-6 and D3 has been allocated PRB#1.
  • D2 may be switched to the ISM band in TTI#5 as indicated in the table of Fig. 6.
  • eNB If eNB detects that there is overlapping between D2D UE's on-demand resource allocation and the shifting could not solve the problem in one ISM band (this should be a very rare case), then eNB cancels some D2D communication with lower priority to eliminate the overlapping problem.
  • eNB may give some indication about the resource shifting, resource expanding, and resource cancellation if needed.
  • the potential D2D UE multiplexing on the ISM band could be done directly without extra explicit signaling when the ISM is available.
  • D2D UE is aware of the partial reuse or no reuse situation (e.g., the expected resource could not be used), D2D UE could check the latest available ISM band channel availability information, and start to prepare the D2D communication on the ISM band according to the received control signaling, either immediately or after a certain period, for example in PRB#4-6 in TTI#5 for D2 or PRB#1 for D4 (Fig. 6).
  • the usable resources may not change frequently.
  • the common bitmap to indicate the usable unlicensed band resources may just need to be updated on a longer interval period.
  • Connected UEs can check the toggle bit to decide whether they need to decode the whole common bit map.
  • Newcomers e.g., UE just completing random access channel (RACH) procedure
  • RACH random access channel
  • the common bit map has 13 bits for 13 WLAN channels in the ISM band respectively indicating whether the channels are free.
  • One toggle can be sent to indicate whether the common bitmap has been updated.
  • decoding the common bitmap can be skipped if there is no change on the toggle bit. If the toggle bit changes, the common bitmap would be decoded and stored for updating. The UEs with the first transmission/reception after the RACH procedure can immediately read the common bitmap regardless of the toggle bit.
  • the common bitmap with the toggle bit can be sent periodically (not every TTI) in order to: a) ensure that the new comers can get the usable resource information in a timely manner; b) the connected UEs do not need to decode the known bitmap to waste the processing resources; and c) ensure robust decoding in case of failure on common bitmap decoding.
  • the method described herein is advantageous because it has no impact on current LTE cellular UE operation. It permits eNB to efficiently assign resources for D2D communication.
  • the cellular band may be fully utilized for D2D communication with minimum signaling overhead.
  • the ISM band can be exploited in cases where D2D communication may operate without explicit resource allocation signaling for UE multiplexing.
  • a cell specific reuse indication table with common ID may be transmitted from eNB to D2D UE.
  • the maximum size of the reuse indication table is 50 bits. That should not be a significant overhead to the system supporting the D2D communication as this table is cell specific.
  • An indication bit (the toggle bit) is needed on the PDCCH level to represent the ISM resource allocation variance. However, this overhead is minor compared with the conventional method.

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Abstract

L'invention concerne un procédé d'attribution de ressources de canal cellulaire et/ou de ressources de bande ISM partagée à des paires/groupes d'un équipement utilisateur (UE) dispositif à dispositif (D2D). Une entité de réseau effectue des attributions de blocs de ressources physiques de canal cellulaire à l'UE D2D en se basant sur des mesures d'interférence soit effectuées par l'entité de réseau soit rapportées à celle-ci par l'UE. Des attributions semi-persistantes de canaux sont transmises de façon périodique à l'UE sur un canal de commande de liaison descendante. Des attributions spécifiques de canal sont transmises à et reçues par l'UE D2D dans chaque intervalle de temps de transmission. Lorsque la bande cellulaire n'a pas de ressources suffisantes à attribuer à l'UE D2D, l'entité de réseau peut déterminer des parties de bande ISM partagée qui peuvent être attribuables à l'UE D2D et transmettre les attributions de canaux dans la bande ISM à l'UE. Un bit indicateur peut être ajouté aux transmissions d'attribution pour indiquer s'il y a eu un changement des attributions depuis la transmission précédente.
PCT/CN2012/072971 2012-03-23 2012-03-23 Procédé et appareil d'attribution de ressources dispositif-à-dispositif WO2013139041A1 (fr)

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