WO2013075314A1 - Procédés et appareil de sélection de porteuse composante - Google Patents

Procédés et appareil de sélection de porteuse composante Download PDF

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Publication number
WO2013075314A1
WO2013075314A1 PCT/CN2011/082860 CN2011082860W WO2013075314A1 WO 2013075314 A1 WO2013075314 A1 WO 2013075314A1 CN 2011082860 W CN2011082860 W CN 2011082860W WO 2013075314 A1 WO2013075314 A1 WO 2013075314A1
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WO
WIPO (PCT)
Prior art keywords
component carrier
information
control channel
uplink control
physical uplink
Prior art date
Application number
PCT/CN2011/082860
Other languages
English (en)
Inventor
Pengfei Sun
Na WEI
Wei Bai
Erlin Zeng
Haiming Wang
Wei Hong
Original Assignee
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.)
Filing date
Publication date
Application filed by Renesas Mobile Corporation filed Critical Renesas Mobile Corporation
Priority to PCT/CN2011/082860 priority Critical patent/WO2013075314A1/fr
Publication of WO2013075314A1 publication Critical patent/WO2013075314A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs, and more specifically relate to mechanisms for managing the use of unlicensed frequency bands for wireless network communication.
  • an apparatus comprises at least one processor and at least one memory storing a program of instructions.
  • the program of instructions is configured, with the at least one memory and the at least one processor to cause the apparatus to perform actions comprising at least delivering information to a device indicating a component carrier to be selected by the device for use as a physical uplink control channel when a component carrier being used by the device for a physical uplink control channel becomes unavailable.
  • a method comprises wirelessly transmitting information to a device indicating a component carrier to be selected by the device for use as a physical uplink control channel when a component carrier being used by the device for a physical uplink control channel becomes unavailable.
  • a non-transitory computer readable storage medium stores a program of instructions, execution of which by a processor configures an apparatus to perform actions comprising at least delivering information to a device indicating a component carrier to be selected by the device for use as a physical uplink control channel when a component carrier being used by the device for a physical uplink control channel becomes unavailable.
  • Figure 1 illustrates a cell of a wireless network in which embodiments of the present invention may be implemented
  • FIG. 2 illustrates details of a base station according to an embodiment of the present invention
  • FIG. 3 illustrates details of a user device according to an embodiment of the present invention
  • FIG. 4 illustrates a sequence of operations according to an embodiment of the present invention.
  • Fig. 5 illustrates a process according to an embodiment of the present invention.
  • radiofrequency spectrum available to users of a network is being used at full capacity by users within a geographic area, the addition of new infrastructure such as new base stations will not increase the capacity of the network within that area because the limitation is imposed not by the available infrastructure, but by the capacity of the available radiofrequency spectrum to carry data.
  • Operators of wireless networks and manufacturers of wireless devices and wireless network infrastructure are therefore seeking ways to increase the radiofrequency spectrum available for use by wireless networks.
  • Various approaches to the problem of increasing the available spectrum introduce problems such as unreliability of various channels, so that mechanisms need to be found that allow these problems to be tolerated or overcome.
  • TVWS bands television white space
  • the use of TVWS bands carries numerous advantages.
  • One of the advantages is a low cost. No license is required for the use of TVWS bands, and expanded frequency ranges gained through the use of these bands comes at a much lower cost than equivalent gains achieved through expansion of licensed bands such as LTE frequencies.
  • Deployment can be flexible and new installations can be deployed as required, with less care being needed for integration of new installations with existing deployments than is necessary for equivalent installations using only LTE frequencies.
  • TV band devices may therefore be used with applications for which constraints associated with costs or with difficulty of deployment might inhibit the use of conventional LTE devices.
  • Use of TVWS frequencies in LTE networks provides the potential for significant increases in available bandwidth, but introduces problems associated with unreliability of carriers as those carriers become unavailable due to factors such as the needs of other users or regulatory changes.
  • TVWS frequencies may be thought of as falling into two categories: standalone utilization, in which an entire cellular system, such as an LTE system, uses only TVWS frequencies, and hybrid utilization, in which both licensed and unlicensed bands are used for LTE communications, with a system using strategies that use appropriate bands as needed.
  • Embodiments of the invention recognize that the use of unlicensed bands presents a number of challenges that are not encountered in the use of only licensed LTE bands.
  • Unlicensed bands are shared in an open access manner, so that it is not possible for any particular system to occupy an unlicensed band at all times.
  • numerous sources of interference can be expected, as other systems begin and stop using various frequencies in the band.
  • the availability of frequencies in unlicensed bands may change over time, as various countries introduce new regulations relating to shared band operation such as TVWS bands.
  • PUCCH Physical uplink control channel
  • HA Q uplink control channel
  • PUCCH carries scheduling requests and HA Q feedback, as well as channel quality information.
  • the PUCCH is associated with the uplink primary serving cell (PCell), which is configured by a higher layer.
  • PCell uplink primary serving cell
  • PUCCH is highly reliable and can be expected to be available except under unusual circumstances.
  • Such availability of the PUCCH is important for a number of aspects of operation, such as HA Q, which is time critical.
  • FDD frequency division duplex
  • a user device or user equipment must send back acknowledgement bits to a base station, such as an eNodeB (eNB) 4 subframes after detection of a physical downlink shared channel (PDSCH).
  • eNB eNodeB 4 subframes after detection of a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • PUCCH design may be unworkable.
  • a primary component carrier (PCC) of an uplink Pcell may break down frequently or may be moved due to strong interference or to a regulatory change.
  • UEs using such a disappearing channel may encounter periods in which they are unable to transmit control channel information.
  • Such failures cause significant uplink performance limitations, particularly in the transmission of time critical acknowledgement bits. Therefore, PUCCH relocation must be accomplished quickly and reliably in response to a breakdown of an uplink Pcell, so that the uplink control procedure can be recovered.
  • Embodiments of the invention also recognize that techniques that are sufficient for relocation of a PUCCH for a single UE, such as a handover procedure, are inadequate to meet the situation encountered when a Pcell breaks down. In such a case, large numbers of UEs are suddenly left without a PUCCH, and need a rapid relocation. Such a rapid relocation for large numbers of UEs cannot be achieved through handover, which was designed to deal with the needs of a transition between cells of a single UE.
  • Fig. 1 illustrates a cellular network 100 according to an embodiment of the present invention.
  • the network 100 comprises a cell 102, served by a base station, with the base station implemented here as eNB 106.
  • the network 100 serves a plurality of UEs 110A,. . .,110G, distributed through the cell 102.
  • the eNB 106 and the UEs 11 OA,. . .,110G may be configured to operate exclusively using unlicensed frequency bands, such as television white space bands.
  • the eNB 106 may suitably be configured so as to be able to employ a plurality of component carriers available in the TVWS bands, with one component carrier being selected at any particular time for use as a PUCCH.
  • Each of the UEs may also be configured to able to use the component carriers that can be used by the eNB 106, and to select as a PUCCH the same component carrier selected by the eNB.
  • both the eNB 106 and the UEs 110A,. . .,110G use mechanisms according to embodiments of the present invention to quickly relocate the PUCCH from the unavailable component carrier to another component carrier.
  • different UEs may use different component carriers, or groups of UEs or all UEs may use the same component carrier.
  • each of the UEs within the cell is a cell
  • the UE 102 such as the UEs 110A,. . .,110G, is preconfigured with component carrier information, and a priority sequence to be followed to relocate the PUCCH if the PUCCH currently being used becomes unavailable.
  • the priority sequence may suitably be established through signaling by the eNB 106.
  • relocation of the PUCCH to another component carrier is triggered for the UEs, such as through recognition that the PUCCH being used has been lost, the UEs for which relocation has been triggered follow their assign priority sequence to select a new component carrier to be used for the PUCCH.
  • the priority sequence may be established for a single UE or for a group of UEs, and different priority sequences may be established for UEs using different PUCCHs. It will be recognized, however, that different UEs using the same PUCCH may use different priority sequences and may select different component carriers in response to loss of the PUCCH.
  • a UE or group of UEs When relocation is triggered, a UE or group of UEs will find the next available component carrier listed in its assigned sequence, and select the component carrier as its PUCCH. The UE or group of UEs will then use the selected component carrier to transmit PUCCH information after a predefined duration.
  • the priority sequence may be defined by a higher layer before delivery to the UEs, and may be periodically updated, such as after coordination between the eNB 106 and the UEs in the cell 102. Relocation may suitably be triggered implicitly, such as through recognition by a UE that its PUCCH is no longer available, or explicitly, for example, through an explicit layer 1 downlink signal.
  • the eNB 106 explicitly triggers a UE or a group of UEs, such as one or more of the UEs 11 OA,. . .,110G, through explicit signaling.
  • the eNB 106 directs the UEs to relocate their PUCCHs from the current component carrier to a specified target component carrier. Relocation may suitably be triggered using a fast layer one signal.
  • the downlink layer 1 signal may suitably include an identification of the target component carrier, such as an index to the target component carrier.
  • PUCCH resource reservation and selection occurs dynamically.
  • the PUCCH resources are explicitly assigned to each UE through radio resource control ( C) signaling.
  • resources for use as a PUCCH may be reserved across all component carriers that are configured for use as uplink component carriers, as opposed to dedicating a single component carrier for use as the PUCCH.
  • a number N of resources are reserved in each component carrier, and in another alternative, a number N of resources are reserved across all component carriers.
  • PUCCH resource selection is defined using information contained in a downlink grant.
  • a downlink grant transmitted by the eNB 106 to a UE suitably includes a resource indicator defining for the UE the resource to be used for the corresponding PUCCH. The indicator may suitably be chosen so that the maximum number of resources indicated is sufficient to accommodate a large number of UEs in a single component carrier while managing overhead.
  • appropriate downlink control information (DCI) formats are used to deliver appropriate component carrier and triggering information.
  • An indicator may include a bit sequence comprising sufficient bits to select an appropriate component carrier index when explicit targeting is used, or to indicate the use of a predefined priority sequence. For example, if a three-bit indicator is used, "000" may direct the use of a predefined priority sequence, while “001 "-”111" may each indicate a particular component carrier.
  • One suitable mechanism for defining the indicator is to merge the indicator bits with the ARI bits in the downlink grant.
  • Fig. 2 illustrates additional details of the eNB 106.
  • the eNB 106 comprises a transmitter 202, receiver 204, and radiocontroller 206, as well as an antenna 208.
  • the eNB 106 further comprises a processor 210, memory 212, and storage 214, communicating with one another and with the radiocontroller 206 over a bus 216.
  • the eNB 106 employs data 218 and programs 220, suitably residing in storage 214.
  • the data may suitably comprise priority sequence information 222, which may be delivered to UEs for use in selecting an appropriate component carrier.
  • the data may further comprise a component carrier database 224, identifying and indexing available component carriers.
  • the data 218 may additionally comprise an on-off pattern 226 and an availability change record 228.
  • the on-off pattern 226 comprises information relating to predicted patterns of availability and unavailability of component carriers, and the availability change schedule 227 stores information relating to long term changes in the availability of component carriers, such as regulatory changes adding frequencies to or removing frequencies from available unlicensed bands.
  • the programs 220 may suitably comprise one or more mechanisms to be used for recognizing the failure of a PUCCH and directing appropriate relocation of the PUCCH.
  • the programs 220 may, for example, comprise an interference monitor 228, a relocation trigger 230 module, and an on-off pattern scheduler 232.
  • the interference monitor 228 directs the monitoring of interference in the environment and causes triggering of relocation of a PUCCH when the interference is such that the component carrier currently being used is effectively unavailable.
  • the relocation trigger 230 may be invoked by the interference monitor 228, for example, or may be invoked when information relating to a change in availability of a component carrier is received from an external source, or at a designated time when a component carrier being used has been scheduled to become unavailable.
  • the on-off pattern scheduler 232 may invoke the relocation trigger 230 module in order to perform relocation according to an on-off pattern of the component carriers being used, causing switching between component carriers as one or another becomes unavailable.
  • the on-off pattern scheduler 232 may create an on-off pattern and transmit this pattern to one or more UEs.
  • UEs such as the UEs 11 OA,. . .,110G may store a pattern and perform automatic PUCCH relocation in the absence of a trigger, based on knowledge of availability and unavailability of component carriers provided by the pattern.
  • the eNB 106 monitors the channel conditions and the
  • the eNB 106 may employ direct designation of a component carrier as a PUCCH, or may direct one or more UEs to perform relocation according to a predefined priority sequence, which has suitably been previously delivered by the eNB 106 according to the priority sequence information.
  • the eNB 106 may specifically designate component carriers for some UEs and may direct others to perform relocation according to a stored priority sequence.
  • the eNB 106 may suitably designate component carriers or direct selection according to priority sequencing in order to insure that selection of component carriers will be managed in such a way that no PUCCH resource conflict occurs and PUCCH allocation is balanced among UEs.
  • the eNB 106 may examine the UEs in the cell 102 to determine whether each UE is aware of its relocation target, for example, through stored priority sequence information. For UEs which can find their relocation target, the eNB may simply direct them to relocate to their stored target. For example, the relocation trigger 230 may send to these UEs an indicator value directing relocation according to stored priority sequence information. For UEs which are unable to find their targets automatically, the eNB sends explicit relocation information, suitably by sending an indicator value designating a component carrier.
  • a similar procedure may be used in cases in which an unscheduled change occurs, such as a change due to interference or a regulatory change that was not previously known.
  • the eNB 106 may make a decision about whether to explicitly designate a carrier or direct use of stored information. For example, the eNB 106 may have previously obtained information as to whether the UEs are aware of their target carriers, and may be aware that this condition is not likely to have changed during the intervening time.
  • Fig. 3 illustrates additional details of the UE 11 OA, with the understanding that other UEs may be similarly configured.
  • the UE 11 OA suitably comprises a transmitter 302, receiver 304, and radiocontroller 306, as well as an antenna 308.
  • the UE 110A further comprises a processor 310, memory 312, and storage 314, communicating with one another and with the radiocontroller 306 over a bus 316.
  • the UE 11 OA employs data 318 and programs 320, suitably residing in storage 314.
  • the UE 110A is suitably configured to receive relocation signaling from the eNB 106 and select an appropriate PUCCH resource, such as an available component carrier, in response to the signaling from the UE 11 OA.
  • Signaling may be detected through listening by the UE 11 OA in the common search space shared with other UEs, or in the search space dedicated to the UE or to a group of UEs to which the UE belongs.
  • Relocation may suitably be performed under the control of a PUCCH relocation module 322, residing in storage 314 as part of the programs 320, and transferred to memory 312 as needed for execution by the processor 310.
  • the PUCCH relocation module 326 may select a different component carrier for the PUCCH according to information provided by the relocation signal.
  • the component carrier selected as the PUCCH may be specified in the relocation signal, or may be a component carrier indicated by a priority sequence 324, suitably comprising part of the data 318 and delivered to the UE 110A by the eNB 106 based on the priority sequence information 222 stored by the eNB 106.
  • the UE 11 OA may automatically change from one PUCCH to another based on a stored on-off pattern 326, which may be a copy of the on-off pattern 226 maintained by the UE 106, or may be a portion of the on-off pattern 226, comprising on-off sequences only for component carriers used by the UE 11 OA.
  • the PUCCH relocation module 322 may monitor the on-off pattern 326. When the on-off pattern 326 indicates that a component carrier being used will become unavailable, the PUCCH relocation module 322 selects a new component carrier, such as a component carrier indicated by the priority sequence 324.
  • Fig. 4 illustrates a diagram 400 showing sequencing of relocations according to one or more embodiments of the present invention.
  • the relocations are performed based on information provided by the priority sequence 322 and the on-off pattern 226, and because this information is stored in the UE 11 OA, the relocations illustrated here can be performed without signaling from the eNB 106.
  • the diagram 400 illustrates the use of component carriers 402, 404, and 406 according to a predefined sequence.
  • each of the component carriers 402, 404, and 406 can be seen, with “on” states 408A and 408B being shown for component carrier 402, "on” state 410 being shown for component carrier 404, and “on” states 412A and 412B being shown for component carrier 406.
  • Transmissions 414-424 are also shown.
  • the transmissions 414, 418, and 422 being downlink grants and with the transmissions 416, 420, and 424 being uplink transmissions over a PUCCH.
  • the component carrier 402 is in use as the PUCCH.
  • a transition to an "off state is scheduled, and once the component carrier 402 is no longer available, a relocation 426 is made to use the component carrier 404.
  • the component carrier 404 is chosen because it is the next available component carrier shown in the priority sequence 322. After the component carrier 406 is chosen, transmissions 416 and 420 are conducted successfully. The component carrier 404 subsequently becomes unavailable, and a relocation needs to be made to a new component carrier. In this instance, both the component carrier 402 and the component carrier 406 are available, but a relocation 428 is made to use the component carrier 406 because the component carrier 406 has a higher priority in the priority sequence 322.
  • a possible relocation 430 to the component carrier 402 is also shown here, but the relocation that is actually performed is the relocation 428.
  • embodiments of the invention discussed here may suitably use layer 1 signaling, which is not as reliable as higher layer signaling. Therefore, various embodiments of the invention provide mechanisms to compensate for failure of layer 1 signaling. For example, a UE may miss a downlink relocation signal. Techniques such as transmission diversity or repeating a signal over several subframes may reduce the probability of errors. However, if an error does occur, the UE will not send a signal over the PUCCH indicated by the relocation signal. The eNB 106 will recognize, upon failure to receive a signal on the expected component carrier, that relocation failed, and may therefore employ recovery techniques such as re-transmitting a downlink grant or a relocation signal.
  • recovery techniques such as re-transmitting a downlink grant or a relocation signal.
  • Fig. 5 illustrates the steps of a process 500 according to an embodiment of the present invention.
  • the process 500 may suitably be carried out using components such as the base station 106 and one or more UEs such as the UE 110A, illustrated in Figs. 1-3.
  • a base station delivers information to one or more user devices allowing for automated recognition by the user devices of the unavailability of component carriers being used by one or more of the devices as a physical uplink control channel, and selection of a new component carrier to be used as a physical uplink control channel.
  • the information may suitably comprise information such as an on-off pattern, a priority sequence, an unavailability schedule, and other information identifying when a component carrier may be expected to become unavailable and which component carrier should be selected to replace it.
  • the base station monitors network conditions to detect unavailability of a component carrier being used by one or more UEs as a physical uplink control channel.
  • the base station signals one or more UEs to select new component carriers. Such signaling may specify component carriers to be selected, or may direct UEs to select component carriers based on predefined information.
  • the base station may signal different UEs to select different component carriers, or may signal all UEs to select the same component carrier, or may signal some UEs to select specific component carriers and others to make their own selection based on predefined selection information, based on design choices.
  • the base station need not signal all UEs to select new component carriers.
  • one or more UEs recognize the unavailability of a component carrier being used as a PUCCH, suitably based on locally stored information, and select a new component carrier based on predefined criteria.

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

Abstract

L'invention concerne des systèmes et un appareil de relocalisation de canal de commande de liaison montante physique (PUCCH). Une station de base fournit des informations à un ou plusieurs dispositifs utilisateurs afin de permettre la sélection d'une nouvelle porteuse composante pour un PUCCH lorsqu'un PUCCH courant devient indisponible. Les informations peuvent comprendre une sélection explicite d'une porteuse composante ou une instruction d'utiliser des informations de sélection précédemment stockées. Un dispositif utilisateur peut être informé de l'indisponibilité d'une porteuse composante par signalisation explicite en provenance d'une station de base ou par des informations stockées, telles qu'un motif d'activation-désactivation de porteuses composantes.
PCT/CN2011/082860 2011-11-24 2011-11-24 Procédés et appareil de sélection de porteuse composante WO2013075314A1 (fr)

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Cited By (5)

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WO2015027139A3 (fr) * 2013-08-23 2015-04-23 Qualcomm Incorporated Processus harq communs
TWI559803B (zh) * 2014-05-15 2016-11-21 Ｌｍ艾瑞克生（Ｐｕｂｌ）電話公司 指派雙連接性操作中之分量載波
JP2017523644A (ja) * 2014-05-30 2017-08-17 ゼットティーイー コーポレーションＺｔｅ Ｃｏｒｐｏｒａｔｉｏｎ 情報送信方法、情報受信方法、装置及びシステム
US10567064B2 (en) 2017-09-08 2020-02-18 At&T Intellectual Property I, L.P. Beam recovery for partial control channel failure
WO2022083671A1 (fr) * 2020-10-21 2022-04-28 Mediatek Singapore Pte. Ltd. Procédés de signalisation et de signalisation et de configuration dynamique et statique de canal pucch à porteuses croisées dans des communications téléphoniques mobiles

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CN101980575A (zh) * 2010-10-14 2011-02-23 华为技术有限公司 随机接入的处理方法和终端
EP2385650A2 (fr) * 2010-05-06 2011-11-09 HTC Corporation Procédé de gestion de transmission de canal de contrôle de liaison montante physique et dispositif de communication associé

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CN101778419A (zh) * 2009-01-09 2010-07-14 华为技术有限公司 Pucch资源的配置、发送方法及其装置
EP2385650A2 (fr) * 2010-05-06 2011-11-09 HTC Corporation Procédé de gestion de transmission de canal de contrôle de liaison montante physique et dispositif de communication associé
CN101980575A (zh) * 2010-10-14 2011-02-23 华为技术有限公司 随机接入的处理方法和终端

Cited By (12)

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WO2015027139A3 (fr) * 2013-08-23 2015-04-23 Qualcomm Incorporated Processus harq communs
US10313079B2 (en) 2013-08-23 2019-06-04 Qualcomm Incorporated Common HARQ processes
TWI559803B (zh) * 2014-05-15 2016-11-21 Ｌｍ艾瑞克生（Ｐｕｂｌ）電話公司 指派雙連接性操作中之分量載波
US9629194B2 (en) 2014-05-15 2017-04-18 Telefonaktiebolaget Lm Ericsson (Publ) Assignment of component carriers in dual connectivity operation
TWI589171B (zh) * 2014-05-15 2017-06-21 Ｌｍ艾瑞克生（Ｐｕｂｌ）電話公司 指派雙連接性操作中之分量載波
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JP2017523644A (ja) * 2014-05-30 2017-08-17 ゼットティーイー コーポレーションＺｔｅ Ｃｏｒｐｏｒａｔｉｏｎ 情報送信方法、情報受信方法、装置及びシステム
US10219160B2 (en) 2014-05-30 2019-02-26 Xi'an Zhongxing New Software Co., Ltd. Information sending method, information receiving method, apparatus and system
US10225744B2 (en) 2014-05-30 2019-03-05 Xi'an Zhongxing New Software Co., Ltd. Method and apparatus for sending information
US10567064B2 (en) 2017-09-08 2020-02-18 At&T Intellectual Property I, L.P. Beam recovery for partial control channel failure
US11152998B2 (en) 2017-09-08 2021-10-19 At&T Intellectual Property I, L.P. Beam recovery for partial control channel failure
WO2022083671A1 (fr) * 2020-10-21 2022-04-28 Mediatek Singapore Pte. Ltd. Procédés de signalisation et de signalisation et de configuration dynamique et statique de canal pucch à porteuses croisées dans des communications téléphoniques mobiles

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