WO2009050212A1 - Procédé de partage de spectre - Google Patents

Procédé de partage de spectre Download PDF

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Publication number
WO2009050212A1
WO2009050212A1 PCT/EP2008/063906 EP2008063906W WO2009050212A1 WO 2009050212 A1 WO2009050212 A1 WO 2009050212A1 EP 2008063906 W EP2008063906 W EP 2008063906W WO 2009050212 A1 WO2009050212 A1 WO 2009050212A1
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WO
WIPO (PCT)
Prior art keywords
node
request
spectrum
response
network
Prior art date
Application number
PCT/EP2008/063906
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English (en)
Inventor
Jyri Hamalainen
Antti Sorri
Markku Vainikka
Vinh Van Phan
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Nokia Siemens Networks Oy
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 of WO2009050212A1 publication Critical patent/WO2009050212A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to a method of spectrum sharing and in particular but not exclusively to a method of spectrum sharing m a 3GPP LTE (third generation partnership project long term evolution) system.
  • the present invention also relates to a system and nodes supporting spectrum sharing,
  • a communication system is a facility which facilitates communication between two or more entities such as communication devices, network entities and other nodes.
  • a communication system may be provided by one or more interconnect networks. It should be appreciated that although a communication system typically comprises at least one communication network, for example a fixed line network or a wireless or a mobile network, in its simplest form a communication system is provided by two entities communicating which each other.
  • the communication may comprise, for example, communication of data for carrying communications such as voice, electronic mail (email), text messages, multimedia and so on.
  • the user may communicate by means of an appropriate communication device such as user equipment.
  • An appropriate access system allows the communication device to access the communication system.
  • An access to the communication system may be provided by means of a fixed line or wireless communication interface, or a combination of these.
  • Examples of wireless access systems include cellular access network, various wireless local area networks (WLANs), wireless personal area networks (WPANs), satellite based communication system and various combinations of these.
  • a communications system typically operates in accordance with the standard and/or certain specifications and protocols which set out what the various elements of the system are permitted to do and how that should be achieved. For example, it is typically defined if the user, or more precisely a user equipment is provided with a circuit switched bearer or a packet switched bearer or both. Also, the manner in which communication and various aspects thereof should be implemented between the user equipment and the various elements of the communication system and their function and responsibilities are typically defined by a predefined communication protocol.
  • FSU relates to flexible spectrum use. This refers to the concept of spatially and/or temporarily varying use of the radio spectrum. In other words, in a system comprising more than one operator, each operator does not have an exclusive harmonised spectrum assignment.
  • Spectrum sharing refers to the situation where different systems or subsystems utilise the same part of the spectrum in a coordinated or uncoordinated manner.
  • a special case is sharing based on flexible spectrum use. Typically, these systems are based on similar technology and offer similar services, for example different apparatus sharing the same spectrum by utilising dynamic channel assignment from a common pool of channels.
  • IMT-Advanced system refer to radio access system beyond the IMT-2000 system.
  • a global unified wireless architecture is proposed which visualises a hierarchy of interconnected access systems. This system envisages new radio interfaces with mobile class targeting for lOOMbps and nomadic or local area class targeting for IGBPs.
  • E-UTRAN evolved UMTS (universal mobile telecommunications system) terrestrial radio access network
  • a method comprising determining for a first node in a first network a requirement for at least part of a spectrum resource which is shared with at least one other node in a second network; sending a request from said first node for said at least part of said spectrum resource; and receiving a response to said request indicating if said request has been granted.
  • a first node in a first network said first node configured to determine for said first node a requirement for at least part of a spectrum resource which is shared with at least one other node in a second network; to send a request from said first node for said at least part of said spectrum resource; and to receive a response to said request indicating if said request has been granted.
  • Figure 1 illustrates an example of spectrum sharing
  • Figure 2 shows an example of a system comprising two operators with which embodiments of the invention may be used
  • Figure 3 shows the signalling flow in a first embodiment of the invention
  • Figure 4 shows the signalling flow in a second embodiment of the invention
  • Figure 5 shows the signalling flow in a third embodiment of the invention
  • Figure 6 shows a single operator network with which embodiments of the present invention may be used;
  • Figure 7 schematically shows a user equipment and node b embodying the invention.
  • Figure 1 shows an example of a spectrum sharing situation.
  • Operator A and operator B operate networks which have a spatially overlapping area.
  • one cell 10 belongs to operator A and one cell 12 belongs to operator B.
  • the cell of operator A is indicated diagrammatically by reference numeral 10. The cell allocated to the operator
  • each network will have a plurality of cells. It is also possible that more than two cells may be overlapping.
  • Figure 1 is in terms of the spectrum provided in each cell.
  • a first part of the spectrum 14 is dedicated to the operator A cell site.
  • a part of the spectrum 16 is dedicated to the operator B cell site, that is cell 12.
  • a part of the spectrum dedicated to the operator A cell site is different to a part of the spectrum dedicated to the operator B cell site.
  • Each of the cells 10 and 12 has access to a part of the spectrum 18.
  • This part of the spectrum is shared between the operator A cell site and the operator B cell site.
  • This shared spectrum allows for a better utilisation of spectrum. This is because the various cells can adapt to changing resource needs of the local cell that may belong to the different operator networks. For example, there may be a greater demand on the operator B cell site than on the operator A cell site, In that situation, more of the shared spectrum would be used by the operator B cell site.
  • there is a potential problem that in the shared spectrum there is potential contention and local outage may happen in the shared spectrum region. In other words, an insufficient part of the shared spectrum is allocated to a particular cell resulting in a dropped connection, a reduced data rate, a reduction in quality or the like.
  • Embodiments of the present invention provide inter-operator coordination for the shared spectrum in order to avoid this contention and local outage. It is desirable to at the same ensure a stable, efficient network operation and performance for both of the networks. Thus, in some embodiments of the present invention, fast inter-operator control signalling may be provided. This will be described in more detail hereinafter.
  • Embodiments of the present invention are particularly applicable to the 3GPP LTE system, for example release .09 onwards. Additionally, flexible spectrum use and shared spectrum may also be used with an IMT-A band expansion.
  • RBR Radio Band Resources
  • EUTRAN node B EUTRAN node B cells operating as home eNBs with self-reorganised radio access networks.
  • Embodiments of the present invention provide inter-operator signalling methods and mechanisms to prevent and resolve local outage due to interference in a certain RBR of a cell operating in overlap with a cell site or adjacent the cell site of a different operator.
  • embodiments of the present invention can also be used with a single operator system. In particular, this can be done if the neighbouring cells within the system are allocated with overlapping spectrum resources, as illustrated, in Figure 1.
  • embodiments of the present invention are applicable to spectrum sharing between two or more cells, These cells may be at least partially overlapping or simply adjacent.
  • FIG. 2 The arrangement of Figure 2 shows two operators, operator A and operator B.
  • the domain of operator A is shown as being separated from the domain of operator B diagrammatically by line 30.
  • the two networks share a common IP (internet protocol) core 20.
  • the internet protocol core 20 is connected to a network control entity/gateway 28 of the operator A system.
  • This network control entity/gateway 28 is connected to an eNB 22 of the operator A system.
  • the entity 28 can be MME /S-GW (Mobility Management Entity / Serving
  • GW gateway
  • RRM radio resource management
  • the IP core 20 is also connected to a network control entity/gateway 26 of the operator B system.
  • the network control entity/gateway 26 of the operator B system is connected to an eNB 24.
  • the eNB 24 of the operator B system has a direct connection with the eNB 22 of the operator A system. This interface between the two eNBs is sometimes referred to as an X2 interface. It should be appreciated that in some embodiments of the present invention, this direct connection may not be provided. However, when provided, this direct connection allows fast interoperating interactions as regards the shared spectrum.
  • the network control entity/gateway 28 of the operator A system is also connected to the network control entity/gateway 26 of the operator B system.
  • Figure 6 shows a single operator system. This system may for example be similar to that provided by operator A or that provided by operator B. Additionally, with reference to Figure 6, a brief explanation of the general principals of wireless communications in a system comprising a base station and a communication device such a mobile station will be provided. This explanation may also be applicable to the arrangement of Figure 2.
  • the system shown is a LTE radio system.
  • the term eNB is used for the base station function.
  • a communication device for example a user device can be used for accessing various services and/or applications provided by a communication system. In wireless or mobile systems, the access is provided via an access interface between a user device 1 and an appropriate wireless access system.
  • the user device can typically access wirelessly the communication system via at least one base station (eNB) 110 and 115 In the example shown, two eNBs are shown. In practice,, many more will be provided.
  • the eNBs 110 and 115 can be connected to another system, for example a data network 112.
  • a gateway function between an eNB and the other network can be provided by means of any appropriate gateway node 114, for example a packet data gateway and/or an access gateway.
  • the eNB is typically controlled by at least one appropriate controller entity 116.
  • the controller entity can be provided for managing of the overall operation of the eNB and communications via the eNB.
  • the controller entity 116 is typically with memory capacity and at least one data processor. Functional entities may be provided in the controller by means of a data processing capability thereof.
  • network control entity/gateway shown in Figure 2 can be regarded as being equivalent to the controller 116 and/or gateway 114.
  • LTE long term evolution
  • the system provides an evolved radio access system that is connected to a packet data system.
  • Such an access system may be provided, for example, based on architecture that is known from the E-UTRA (evolved UMTS terrestrial radio access) and based on the use of EUTRAN node Bs (eNBs).
  • E-UTRA evolved UMTS terrestrial radio access
  • eNBs EUTRAN node Bs
  • An E-UTRAN comprises of E-UTRAN node Bs which are configured to provide base station and control functionalities.
  • Figures 2 and 6 shows example architectures only to give examples of possible communication systems where the embodiments described may be provided. It should be appreciated that other arrangements and architectures are also possible.
  • the user device 101 can be used for various tasks such as making and receiving phone calls, for receiving and sending data from and to a data network and for experiencing, for example multimedia or other content.
  • a user device may access data applications provided by a data network.
  • the various applications may be offered in a data network based on the internet protocol (IP) or any other appropriate protocol.
  • IP internet protocol
  • An appropriate user device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples include a mobile telephone, a mobile station, a portable computer provided with a wireless interface card or other wireless interface facility, a personal data assistant provided with wireless communication capabilities or any combination of these or the like.
  • the user device may communicate via an appropriate radio interface arrangement of the mobile device.
  • the interface arrangement may be provided for example by means of a radio part 107 and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • the mobile device is typically provided with at least data processing entity 103 and at least one memory 104 for use in the tasks that it is designed to perform.
  • the data processing and storage entities can be provided on an appropriate circuit board, in an integrated circuit or in chip set. This is denoted diagrammatically by reference 106.
  • Reference numeral 109 diagrammatically represents the measurement and reporting functionality which will be described in more detail hereinafter. As will be described in more detail, the user device makes some measurements for example relating to the channel quality and this is then reported back to the relevant eNB. It should be appreciated that the functionality indicated diagrammatically 109 may be formed at least partially by the data processing entity.
  • the user can control operation of the mobile device by means of a suitable user interface such as a keypad 102, voice command, touch-sensitive screen or pad, combination thereof or the like.
  • a display 105, a speaker and a microphone are also typically provided.
  • the mobile device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories such as hand-free equipment.
  • the user equipment is arranged to carry out measurements and/or calculations based on measurements and to report the result.
  • the user equipment may be able to measure channel quality, the generic state of one or more groups of radio resource blocks and radio band resources, carrier signal strength and so on. These measurements are then reported back to the controlling eNB.
  • the user equipment measurement and reporting is controllable by the network to support effective radio transmission, mobility, network self configuration, spectrum sharing or the like.
  • neighbouring cells and their spectrum allocations may be configured in advance and updated when needed. This may be advised to the neighbouring cells, if required for network control or O&M (operation and management).
  • O&M operation and management
  • the local use of spectrum resources allocated to a cell can be controlled by the local cell itself. Alternatively, the spectrum resources allocated to the cell can be reconfigured or released by the network control entity.
  • FIG. 3 illustrates a first method embodying the present invention.
  • the arrangement of Figure ' 3 illustrates schematically the signalling mechanism proposed in the first embodiment.
  • the two eNBs 22 and 24 are, as in the example of Figure 2 provided by different operators.
  • the user equipment 32 is in communication with the initiating eNB B 22.
  • step Sl 5 the two eNBs are interconnected on the X2 interface.
  • the X2 interface represents a direct connection between the two eNBs or via IP based transport technology such as Ethernet switch and routing networks.
  • step S2 the user equipment is arranged to carry out the required measurements as outlined above and prepare the report for these measurements to send back to the eNB 22 to which it is connected.
  • step S3 a radio resource control measurement report message is sent from the user equipment 32 to the initiating eNB 22.
  • the initiating eNB detects a local outage specific to a certain group or groups of its radio resource blocks or radio band resources. This is caused by spectrum sharing with a neighbouring cell or cells, associated with a different operator. This detection can be based on for example the UE measurement report which show uneven quality indication among the measured group or groups of resource blocks or radio band resources with potential outage happening in certain group or groups. This may be coupled with knowledge about the neighbouring cells of the other operator involved in the shared spectrum, to thereby derive the cause of the outage.
  • Yet another example of triggering conditions for step S4 is based on increased traffic load of the local cell exceeding a certain threshold, also referred to as a local outage, while there may be available resources on the shared spectrum region.
  • the initiating eNB will issue a temporary resource reservation request to the neighbouring eNB 24 via the X2 interface.
  • This resource reservation request informs the requested neighbouring eNB 24 of the following: the identity or formal descriptive information of individual resource block or blocks, or radio band resource or resources temporarily requested; the estimated time interval for which the resource is requested, scheduling occasions within the estimated time interval for which the resource is requested or an until further notice indication for the reservation of each requested resource block or radio band resource. In other words, some timing information is associated with the reservation of a particular resource block or blocks or radio band resource or resources.
  • this information in the temporary resource reservation request is by way of example only and other alternative information may be included additionally or alternatively.
  • an eNB may request its neighbour to turn the transmission power down on the shared spectrum. For example different transmission power-down steps may be provided. A default may be to ask a neighbour to pull off from using the requested resources.
  • the neighbouring cell and in particular the eNB 26, on reception of the resource reservation request examines its own cell load and spectrum usage.
  • the requested neighbouring cell that is the eNB 26
  • the response indicates if the request can be satisfied completely, partially or not at all.
  • the neighbouring cell during the time interval of the committed resource reservation can send an indication to the initiating eNB 22 to change the commitment of the neighbouring cell 24 for the remaining time period of the reservation time interval.
  • the neighbouring eNB 24 can send a message to the initiating eNB 22. This is indicated by S8.
  • step S 12 the neighbouring eNB 24 on receipt of the message from the initiating E node B, sends a confirmation back specifying its updated commitment level or simply to acknowledge the indication.
  • the acknowledgement of the indication may for example occur where the reservation is to be deleted.
  • the concept of a timer T is used in the initiating eNB.
  • the timer T is to guard against a feedback event.
  • the timer T is set such that a response is received from the neighbouring eNB 24 before the initiating eNB 22 repeats or issues a modified request. This prevents the repetition of the request or other requests such as intra-system cell reconfiguration requests from the initiating eNB or the reclaiming of the reserved resources for local usage at the requested neighbouring eNB.
  • the eNBs involved in the shared spectrum operation may monitor and report such that the resource reservation may be reported to the centralised network control entity.
  • This may be entity 28, a common control entity of both network systems.
  • the common control entity may belong to a third party. This may, for example, be used for charging purposes as agreed between the operators or to trigger a needed cell reconfiguration from the network especially where the neighbouring cells are not able to commit to the reservation request and the outage cannot be quickly resolved.
  • the embodiment shown in Figure 3 has been in the context of two eNBs which are in different systems. It should be appreciated that embodiments of the present invention can be used where the two eNBs are in a single operator system. It should be appreciated that in the embodiment shown, only two eNBs are shown.
  • the initiating eNB may send a message to two or more neighbouring eNBs. The initiating eNB, nevertheless, can try to resolve the outage with one or two selected neighbouring cells first. Then, if it is still needed, subsequent resolution can be carried out with other among the remaining neighbouring-cell list.
  • FIG. 4 shows a second embodiment of the present invention.
  • MME/S-GW mobility management entity / serving gateway
  • step Tl the neighbouring eNB(s) or cell(s) are discovered and inter- operator connectivity is prepared, This involves the initiating eNB 22, the associated controller 28, the eNB 26 of the neighbouring cell and the associated controller 26.
  • steps T2, T3 and T4 correspond to steps S2, S3 and S4 of Figure 3.
  • step T5 a resource reservation request similar to that sent in step S5, is instead send to the controller 28 associated with the initiating eNB 22.
  • That controller 28 passes on that request in step T6 to the controller 26 of the neighbouring eNB 24.
  • That controller 26 of the neighbouring eNB 24 forwards the temporary resource reservation request to the neighbouring eNB.
  • the reply provided by the neighbouring eNB 24 in step T8 corresponds to the reply provided in step S6. However, that response is provided to the controller 28 associated with the neighbouring eNB 24, The controller 26 forwards the response in step T9 to the controller 28 of the initiating eNB 22.
  • the controller 28 of the initiating eNB sends, in step TlO the response to the initiating eNB 22,
  • the communication between the two eNBs is via their respective controllers.
  • the inter operator communications are realised further up in the core network, as compared to the embodiment shown in Figure 3.
  • any suitable control element can be used to provide the communication between the eNBs such as a common RRM radio resource manager.
  • a timer is set. This is indicated diagrammatically by reference B. However, it should be noted that the timer is set for a longer period in the arrangement of Figure 4 as compared to Figure 3. This is to allow sufficient time for the response to be received by the initiating eNB.
  • FIG. 5 shows a further embodiment of the present invention.
  • this embodiment there is user equipment assisted centralised control using i ⁇ tra-system reconfiguration.
  • steps Al to A4 correspond generally to steps Tl to T4 of Figure 4.
  • the initiating eNB 22 indicates that the detected local outage with descriptive details, similar to those included in the reservation request of the previous embodiment and sends this information to the centralised network controller 28 associated with the initiating eNB. This is sent in a message indicated by A5
  • the centralised network control entity 28 may trigger a network self reconfiguration.
  • the control entity may recalculate cell specific parameters for the initiating cell (and others in effect).
  • a Cell Reconf. Req cell reconfiguration request
  • This in general can be used to change any cell- specific parameters including resource allocation and, herein, how to use the shared resources.
  • This causes a cell reconfiguration request, indicated by A7 to be sent from the network control entity 28 associated with the initiating eNB to the initiating eNB B 22. This thus tries to resolve the local outage with updated resource allocation.
  • the centralised network control entity 28 can then try to exchange shared spectrum related information, including status of effective local cells and possible negotiation with the controller 26 of the neighbouring network.
  • the neighbouring network controller 26 provides shared spectrum related information, in step A 9 to the controller 28 associated with the initiating eNB.
  • control entity 28 associated with the initiating eNB 22 can issue another cell configuration request to the initiating eNB, as referenced by AlO.
  • a further embodiment can be based on a combination of the first and third embodiments.
  • the initiating eNB may use the method illustrated in relation to Figure 5 for a possible cell reconfiguration request from its centralised network control entity.
  • a further embodiment may use aspects of the second and third embodiments.
  • the embodiment may be as in steps Al to A5. Then, possible interactions between the two operator networks can be carried out to resolve the local outage and to prevent further predictable conflict in the shared spectrum between the two networks. This can be as described in relation to the second embodiment. It can be done before the local network control entity issues the cell reconfiguration request, as shown in the third embodiment.
  • aspects of the first, second and third embodiments can all be included in a single mechanism.
  • the user equipment 32 comprises a processor 50.
  • the processor 50 is connected to a transmitter 52 which is in turn connected to an antenna 54.
  • the antenna 54 is connected to a receiver 56 which is connected to a processor 50.
  • the processor 50 Based on information received by the receiver 56, via the antenna 54, the processor 50 is able to formulate a measurement report (as discussed in more detail above), which is sent by the transmitter 52 to the antenna 54 for transmission to a node B.
  • the node B comprises an antenna 61 for receiving radio communication.
  • the antenna 61 is connected to a receiver 60 which is in turn connected to a processor 68.
  • the processor 68 is able to transmit to the user equipment by sending messages to the transmitter 58.
  • the transmitter 58 passes the message for transmission to the antenna 61 for transmission.
  • the processor 68 is also connected to an interface 66 which connected to entity 28.
  • the processor is also connected to the X2 interface 64 which permits the initiating eNB 22 to communicate with the eNB of another cell.
  • the eNB also comprises a memory 70 which can store various information as discussed in more detail here and before.
  • the processor is able to make the various determinations and formulate the various requests for information. Where there is cell configuration carried out by the eNB, this would be under the control of the processor 68.
  • embodiments of the present invention can be applied to a single operator network as well where the neighbouring cells in the network operate m at least partially or fully overlapping allocated resource bands.
  • Embodiments of the present invention may allow the prevention and/or resolution of possible local outages affecting certain groups of resource blocks or radio band resources which result from intolerable interference from overlapping cells belonging to different operators and operating in overlapping radio band resources.
  • Embodiments of the present invention may provide an efficient adaptive spectrum sharing and network operation in co- sited environments.
  • Embodiments of the invention have been described in the context of two overlapping networks. In alternative embodiments, there may be more than two networks which overlap. The two or more overlapping networks may be operated each by different operators. Alternatively, at least two of the different networks may be operated by the same operator.
  • embodiments of the present invention can be implemented at least partially in software. Accordingly, embodiments of the present invention may be partially implemented by a computer program when executed by a suitable processor or the like.
  • embodiments of the present invention have been described as being particularly relevant to the LTE proposal, embodiments of the present invention can be used with any other suitable wireless network.
  • embodiments of the present invention have been described in relation to a base station or eNB and user devices such as mobile stations, embodiments of the present invention are applicable to any other type apparatus suitable for wireless communication, particularly where there is some aspect of spectrum sharing.

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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 un procédé comprenant la détermination pour un premier nœud d'un premier réseau d'un besoin pour au moins une partie d'une ressource spectrale qui est partagée avec au moins un autre nœud d'un second réseau; l'envoi d'une demande par ledit premier nœud pour ladite ou lesdites parties de ladite ressource spectrale; et la réception d'une réponse à ladite demande, indiquant si ladite demande a été acceptée.
PCT/EP2008/063906 2007-10-15 2008-10-15 Procédé de partage de spectre WO2009050212A1 (fr)

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GB0720115A GB0720115D0 (en) 2007-10-15 2007-10-15 A menthod of spectrum sharing
GB0720115.5 2007-10-15

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WO2012158548A1 (fr) * 2011-05-13 2012-11-22 Qualcomm Incorporated Procédés et dispositifs de partage de spectres de fréquences entre des opérateurs de réseau
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WO2013138521A1 (fr) * 2012-03-13 2013-09-19 Qualcomm Incorporated Procédés et appareil de partage de liaison par femtocellules
WO2013155779A1 (fr) * 2012-04-16 2013-10-24 中兴通讯股份有限公司 Procédé et appareil compatibles avec des versions multiples pour le stockage d'une ressource sans fil
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CN105210398A (zh) * 2013-10-28 2015-12-30 华为技术有限公司 资源处理方法和资源处理装置
KR20160074652A (ko) * 2013-10-23 2016-06-28 퀄컴 인코포레이티드 비동기 비허가된 무선 주파수 스펙트럼 대역 배치들에서의 채널 액세스를 위한 기술들
CN106465127A (zh) * 2014-05-19 2017-02-22 诺基亚技术有限公司 用于分布式分层数据库的同步的方法和装置
US9813915B2 (en) 2015-07-07 2017-11-07 Institute For Information Industry Base station and user terminal in spectrum sharing system and method for determining usage of shared spectrum

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JP2016540413A (ja) * 2013-10-23 2016-12-22 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ 非同期無認可無線周波数スペクトル帯域展開におけるチャネルアクセスのための技法
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