WO2013116972A1 - Procédés et dispositifs destinés à une procédure améliorée d'accès cellulaire - Google Patents

Procédés et dispositifs destinés à une procédure améliorée d'accès cellulaire Download PDF

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Publication number
WO2013116972A1
WO2013116972A1 PCT/CN2012/070888 CN2012070888W WO2013116972A1 WO 2013116972 A1 WO2013116972 A1 WO 2013116972A1 CN 2012070888 W CN2012070888 W CN 2012070888W WO 2013116972 A1 WO2013116972 A1 WO 2013116972A1
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WIPO (PCT)
Prior art keywords
subband
bandwidth
core
working
information
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PCT/CN2012/070888
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English (en)
Inventor
Li Zhang
Peter Skov
Jiezhen Lin
Chao Wu
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Nokia Siemens Networks Oy
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Priority to PCT/CN2012/070888 priority Critical patent/WO2013116972A1/fr
Publication of WO2013116972A1 publication Critical patent/WO2013116972A1/fr

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    • 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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties

Definitions

  • the present invention relates to methods and devices for an improved cell access procedure.
  • the present invention relates to such methods and devices applicable in mobile communication systems operating on one or more carriers,
  • a terminal apparatus such as a user equipment UE (or mobile station MS, or the like; different names may apply for respective different standards) is capable of communicating using multiple frequencies or a frequency band based on at least one underlying radio access technology (RAT).
  • RAT radio access technology
  • a RAT is operated on a respective frequency or frequency band, though in practice, each RAT relies on multiple frequencies/bands.
  • frequencies may also be reused, so that - at least at different times and/or in different locations/sites - the same frequency or frequency band may be used by different RAT's.
  • a RAT may also denote a respective service accessible to the terminal apparatus, whether via the intermediary of a network, e.g. in an LTE or LTE-A, or UMTS network environment, or a WLAN /WiFiTM environment, or directly, e.g. in a device-to-device, D2D, operation mode such as in connection with BluetoothTM. Notwithstanding this, different services may still rely on the same RAT. In the following, the aspects of the invention will be exemplarily described. In order to enhance legibility and understandability of the invention, for explanatory purposes only, reference is made to the communication system of LTE or LTE-A (Long Term Evolution, LTE- Advanced).
  • extension carrier as a new carrier type is to be introduced in a future release of LTE, Rel-11, as per a decision in RA l#66bis.
  • An extension carrier is a very promising candidate because it fits well with the design principle agreed in the meeting in that it shall be provided "with at least reduced or eliminated legacy control signalling and/or CRS" (common reference signal).
  • the new carrier type should be associated with a backward compatible carrier, and all the basic functions shall be provided via that carrier.
  • Rel-12 however, such limitation could again be removed so that the new carrier type could be a stand-alone and non-backward compatible carrier.
  • This could !ead to a possible new layer 1, LI, design that can provide some advantages that are missing in Rel-8/9/10.
  • One desirable property is to avoid any constraint on other parts of the system bandwidth than the subband used for cell search.
  • a terminal device UE Before the cell search procedure, a terminal device UE has no information on system configuration adopted by the serving network transceiver station (e.g. base station BS or NodeB, or evolved NodeB, eNB). Hence, how the subband used for cell search is organized should be specified in the standard, but the organization of other parts of the carrier should be configurable. Also it is unreasonable and unnecessary for the terminal UE to rely on any hypothesis about other parts of the carrier to accomplish cell search procedure.
  • MTC Machine Type Communication
  • UEs are e.g. represented by sensors equipped with a communication module used for reporting sensed results.
  • UEs with different bandwidth capabilities can work on a single carrier; for example, with a 20MHz carrier, normal UEs can access any part across the carrier, while narrow-band UEs (capabale of operating only within a 1.4MHz bandwidth) would only work in a 6-P B subband.
  • a carrier outside a subband used for cell search cannot be flexibly configured. Namely, the terminal UE gets the knowledge of central frequency from the synchronization channel, so the subband containing PSS/SSS/PBCH is mandatorily located in the centre of the carrier.
  • DL control channels like PCFICH/PHICH/PDCCH are transmitted in a distributed manner over the entire bandwidth, so some kind of common reference signal is mandatorily required across the carrier in order that the terminal knows where to listen for control signals.
  • UEs with narrow-band capability cannot accomplish a cell search procedure and cannot access the system.
  • the data transmission (PDSCH/PUSCH) of the narrow-band UE will not be a problem because it is up to eNB's configuration/scheduling to decide where the transmission would happen in the frequency domain, it is the control signaling design adopted in Rel-8/9/10 that makes it impossible for 1.4MHz operation within 20MHz system bandwidth.
  • the central frequency and system bandwidth is a cell-specific information and closely coupled with PSS/SSS/PBCH control channels.
  • PCFICH/PHICH/PDCCH control channels are transmitted in a distributed manner. Therefore, in order to decode those control channels, the UE will need to be able to access the whole system bandwidth.
  • PUCCH is usually transmitted at the edge of the system bandwidth, which requires the UE to cover the whole bandwidth.
  • a device comprising a control module configured to provide for a ceil access procedure for the device, and comprising a transceiver module, which under control of the control module, is configured to
  • a core-subband of a first bandwidth on which a network transceiver device transmits and receives information the network transceiver device being capable of transmitting and receiving information over a second bandwidth greater than the first bandwidth, and perform an initial random access procedure to said network transceiver device within said core-subband, wherein control information and control channels associated to said search and initial random access procedure are constrained within the core-subband, inform the network transceiver device of bandwidth capabilities of the device, and receive configuration information pertaining to a working- subband for the device, the working-subband being defined by a third bandwidth corresponding to the bandwidth capabilities of the device, the third ba ndwidth being smaller than or equal to the second bandwidth, and a central frequency of said working-subband;
  • a device comprising a control module configured to provide for a cell access procedure involving a terminal device, and comprising a transceiver module, which under control of the control module, is configured to offer information in a core-subband of a first bandwidth on which the device transmits and receives information, the device being capable of transmitting and receiving information over a second bandwidth greater than the first bandwidth, and participate in an initial random access procedure of said device within said core- subband, wherein control information and control channels associated to said offering and initial random access procedure are constrained within the core-subband, receive, at the device, bandwidth capabilities of the terminal device, and transmit configuration information pertaining to a working-subband for the terminal device, the working-subband being defined by a third bandwidth corresponding to the bandwidth capabilities of the terminal device, the third bandwidth being smaller than or equal to the second bandwidth, and a central frequency of said working-subband .
  • a method comprising providing for a cell access procedure for a terminal device, comprising : searching a core-subband of a first bandwidth on which a network transceiver device transmits and receives information, the network transceiver device being capable of transmitting and receiving information over a second bandwidth greater than the first bandwidth, performing an initial random access procedure to said network transceiver device within said core- 5 subband, wherein control information and control channels associated to said searching and initial random access procedure are constrained within the core-subband, informing the network transceiver device of bandwidth capabilities of the terminal device, and receiving configuration information pertaining to a working-subband for the 10 terminal device, the working-subband being defined by a third bandwidth corresponding to the bandwidth capabilities of the terminal device, the third bandwidth being smaller than or equal to the second bandwidth, and a central frequency of said working-subband.
  • i a method comprising providing for a cell access procedure involving a terminal device, comprising offering information in a core-subband of a first bandwidth on which a network transceiver device transmits and receives information, the network transceiver device being capable of transmitting and receiving information over a second
  • the working-subband being defined by a third bandwidth corresponding to the bandwidth capabilities of the terminal device, the third bandwidth being smaller than or equal
  • a computer program product comprising computer-executable components which, when the program is run on a computer, are configured to perform the method aspects as indicated above.
  • the above computer program product/products may be embodied as a computer-readable storage medium.
  • performance improvement is based on methods, devices and computer program products which, in at least exemplary embodiments, adopt a narrow-band cell access (aka bootstrap) procedure on a new carrier type which is non backward compatible to Rel-8/9/10.
  • the proposed narrow-band cell access procedure only involves e.g., a single 6-PRB (1.4MHz) subband on a stand-alone extension carrier.
  • the subband for the cell access (bootstrap) procedure could be different from the mentioned 6 physical resource blocks and 1.4 MHz, e.g. it could correspond to 3 MHz, or less than 1.4 MHz.
  • FIGURE 1 illustrates a flow chart operation diagram of an apparatus such as a UE in relation to at least an aspect of the invention
  • FIGURE 2 illustrates a bandwidth allocation diagram according to at least an exemplary aspect of the present invention
  • FIGURE 3 illustrates a bandwidth allocation diagram according to at least another exemplary aspect of the present invention.
  • FIGURE 4 illustrates a bandwidth allocation diagram according to at least another exemplary aspect of the present invention.
  • cell access procedure as used herein is sometimes also referred to (also known as) "bootstrap” procedure.
  • the procedure denoted thereby i.e., focusedcell access” or adopted bootstrap
  • cell search as such is typically a UE behavior, and the network can be totally unaware of the UE that is trying to get access to the network.
  • the invention is implemented in, at least under an exemplary aspect, a terminal apparatus such as a UE, or in a part thereof such as a device of the UE.
  • a terminal apparatus such as a UE, or in a part thereof such as a device of the UE.
  • Such device can be a chip or chipset, or a subunit of the apparatus, or the like.
  • the device comprises at least a memory module, MEM, in which software code portions and/or data is stored or are stored.
  • the memory module is connected to a control module such as a processor, or CPU, or ASIC.
  • the control module is connected to a transceiver module.
  • the transceiver module is configurable for communication via the respective RAT and/or frequency band, i.e. configurable for the associated service such as LTE, or LTE-A.
  • an apparatus such as an elMB of comprises a device according to an aspect of the invention.
  • a device can be a chip or chipset, or a subunit of the apparatus, or the like.
  • the device comprises at least a memory module, MEM, in which software code portions and/or data is stored or are stored.
  • the memory module is connected to a control module Ctrl such as a processor, or CPU, or ASIC.
  • the control module is connected to a transceiver module.
  • the transceiver module is configured for communication via the respective RAT and/or frequency band, i.e. configured for the associated service such as LTE, LTE-A with the UE.
  • respective modules may even be implemented as corresponding functional means (and without departing from the gist of the invention).
  • Such a method comprises providing for a cell access (or bootstrap) procedure for a terminal device.
  • it further comprises searching a core-subband of a first bandwidth on which a network transceiver device such as an eNB transmits and receives information.
  • a configuration information in terms of an initial random access is, e.g., included in SIB-2, but it may be included in other system information blocks or information blocks.
  • the satisfyingsearching" activity for the purpose of the present description, may implicitly include such SI reading.
  • the network transceiver device is capable of transmitting and receiving information over a second bandwidth which is greater than the first bandwidth.
  • the terminal performs an initial random access procedure to said network transceiver device within said core-subband.
  • control information and control channels associated to the searching and access procedure are constrained within the core-subband.
  • the core-subband is constituted by a downlink core-subband, the location of which within the second bandwidth is specific for the network transceiver device, and an uplink core-subband, the location of which is determined by system information received at the terminal device.
  • the core-subband as named herein is the subband where UE performs the bootstrap. It is for example 6-PRB in width (1.4MHz) in both UL and DL. (Note that the UL core-subband is not shown in Figs. 2, 3, and 4, but that in terms of the core-subband, only the DL core-subband is illustrated . )
  • the location of the DL core-subband in the frequency domain can be cell-specific, i.e. differs for different eNBs (as shown in Fig . 4 for an exemplary el ⁇ I B#l and an exemplary eNB#2) This allows for some ICIC to reduce interference between core-subbands. Also the terminal UE will do blind searching for the location of the DL core-subband as in Rei-8/9/10.
  • the location of the UL core-subband in the frequency domain can be as same as PRACH . PRACH location in frequency domain is read from SIB-2 as in Rel-8/9/10. (Note that Fig . 2, 3 and 4 show only the DL core-subband(s), not the UL core-subband(s) .)
  • information pertaining to a central frequency and a working bandwidth of terminal device is absent from synchronization and common control channels carried in the core-subband. That is, central frequency and working bandwidth are decoupled from e.g. a sync channel and PBCH .
  • the method comprises informing the network transceiver device of bandwidth capabilities of the terminal device, and receiving configuration information pertaining to a working-subband for the terminal device.
  • the working-subband is defined by a third bandwidth corresponding to the bandwidth capabilities of the terminal device, while the third bandwidth is smaller than or equal to the second bandwidth, and by a central frequency of said working-subband.
  • the third bandwidth of the working-subband according to the terminal devices capabilities can be the same or different from the first bandwidth of the core-subband, e.g. 1.4MHz, or 3MHz, or the like.
  • Those configuration information are received in a dedicated radio resource control message, which is also carried in the UL/DL core- subband.
  • the configuration information dedicated for respective individual terminal devices are distinct in at least one of the central frequency of said working- subband and the third bandwidth corresponding to the bandwidth capabilities of the respective terminal device.
  • Fig. 3 shows two working-subbands of different central frequency and different bandwidth for different MTC UEs #1 and #2, respectively.
  • the working bandwidth (second bandwidth) of normal UEs (carrier bandwidth) can thus be used by at least two different MTC UEs #1 and #2 in respective working subbands for those after gaining access thereto due to the cell access (bootstrap) procedure.
  • MTC UEs#l and MTC UEs#2 may denote a respective single UE but may also denote a respective group of UEs having similar configuration properties, i.e.
  • Fig. 1 shows the cell access (bootstrap) procedure by the UE composed of a ceil search and an initial RACH access.
  • UE When UE is powered on, it firstly synchronizes with PSS/SSS and then "reads", i.e. listens to and decodes PBCH as in Rel-8/9/10. However, central frequency and working bandwidth (for "normal" UEs) are decoupled from the synchronization channels and PBCH. Instead, the information will be later on signaled to the UE via a dedicated RRC message, after eNB gets the knowledge about UE bandwidth capability. For the UE to decode SI messages transmitted on PDSCHs, the eNB ensures that the DL assignments with SI-RNTI and corresponding PDSCHs are allocated within DL core-subband.
  • eNB For UE to decode RAR transmitted on PDSCH, eNB likewise ensures the DL assignment with RA-RNTI and corresponding PDSCH are allocated within DL core-subband. DL assignment with temporary C- RNTI and corresponding PDSCH (Msg4) is also within DL core- subband.
  • the PUSCH containing Msg3 is within UL core-subband.
  • ACK response (not shown in Fig. 1) for Msg4 is carried on PUSCH within UL core- subband rather than PUCCH.
  • Other configurations are made after the eNB gets the information on UE bandwidth capability. Then, it configures X-PRB as working- subband's bandwidth (3 rd bandwidth) (may be different from the core-subband width) based on the UE capability (particularly the supported bandwidth) to thereby define a working-subband for the narrow-band UE through dedicated messages.
  • BS/eNB ensures that the signaling related to this configuration is transmitted within the DL/UL core-subband.
  • common control signaling may not be available outside the core subband, such as the PBCH. If information is changed, it will instead be provided using dedicated radio resource control signaling.
  • the central frequency and working bandwidth after cell access (bootstrap) procedure is terminated is then determined at both eNB and UE side.
  • Different UEs may have different central frequency and working bandwidth as shown in Figure 2 and 3.
  • the UE demodulation and channel measurement may be based on different solution than in the core-subband.
  • the UL working-subband may be on the similar place of the DL working-subband for TDD, or on the corresponding paired position of UL band for FDD.
  • the bandwidth of UL working-subband may or may not be similar with DL, depending on the UE capability.
  • working subband reduces the load on the core- subband which will only be used for bootstrap procedure so this allows many MTC UEs operating with low system bandwidth to be served by one carrier operating with large system bandwidth.
  • An aspect of the narrow-band cell access (i.e. bootstrap) procedure resides in making sure that DL assignments with SI-RNTI and RA- RNTI are constrained within DL core-subband and UL grant for Msg3 is constrained to UL core-subband.
  • the DL core-subband can have the same function and structure as a Rel-8 carrier of 1.4MHz, which is known to be working stand-alone.
  • CRS can be used for demodulation, but is independent of a configuration on other PRBs outside DL core-subband. Note that in a modification this concept could also work with other DL control designs such as the solutions discussed by 3GPP under the title "enhanced physical downlink control channel", ePDCCH .
  • Rel-8 PDCCH design and structure in 1.4MHz band could also be viewed as one option for a common search space of ePDCCH. Since it is almost impossible to benefit from beamforming or FDPS for those DL assignments and PDSCHs, the distributed transmission from Rel-8 may be the best choice.
  • UCI is carried via PUSCH.
  • PUCCH-based format can be used on PUSCH with a single-PRB allocation within UL working-subband.
  • UEs with different bandwidth capabilities can work together on a single carrier, which would be especially useful to low cost MTC UEs.
  • one design option for downlink control signaling to support the cell access (bootstrap) procedure by re-using a stand-alone Rel-8 1.4MHz carrier. It is a well-proved design and requires minimum standard efforts.
  • a further benefit of the narrow band access procedure is that the core-subband can be positioned flexibly within the carrier, and the reference signal can be flexibly configured outside DL core-subband because UEs do not use other resources for the access procedure. The positioning of the non-core PRBs can be signaled to the UE during or after cell access (bootstrap) procedure.
  • Embodiments of the present invention may be implemented in 5 software, hardware, application logic or a combination of software, hardware and application logic.
  • the software, application logic and/or hardware generally reside on a memory module.
  • a memory module may be a volatile or non-volatile memory module, such as a RAM, ROM, EPROM, EEPROM, or harddisk, or the like.
  • the application logic, software or an instruction set is maintained on any one of various conventional computer-readable media.
  • a "computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in
  • L 5 connection with an instruction execution system, apparatus, or device, such as a computer or smart phone, or user equipment.
  • the present invention relates in particular but without limitation to mobile communications, for example to environments under LTE, 0 LTE-A, and subsequent releases thereof and can advantageously be implemented in user equipments or smart phones, or persona! computers connectable to such networks.
  • Particular usefulness will be exhibited for terminals or devices that participate in so-called machine type communication, MTC, scenarios, e.g. remotely located 5 measurement devices that report the captured data wirelessfy in a limited (narrow) bandwidth within the general bandwidth of the e.g. LTE system.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined .
  • the present invention proposes a terminal device comprising a control mod ule configured to provide for a cell access procedure for the device, and comprising a transceiver module, which under control of the control module, is configured to search a core-subband of a first bandwidth on which a network transceiver device transmits and receives information, the network transceiver device being capable of transmitting and receiving information over a second bandwidth greater than the first bandwidth, and perform an initial random access procedure to said network transceiver device within said core- subband, wherein control information and control channels associated to said search and initial random access procedure are constrained within the core-subband, inform the network transceiver device of bandwidth capabilities of the device, and receive configuration information pertaining to a working-subband for the device, the working-subband being defined by a third bandwidth corresponding to the bandwidth capabilities of the device, the third bandwidth being smaller than or equal to the second bandwidth, and a central frequency of said working-subband.
  • the present invention proposes a corresponding network transceiver devices as well
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • eNodeB Basestation/ evolved NodeB

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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 a trait à un dispositif terminal comprenant un module de commande configuré pour fournir au dispositif une procédure d'accès cellulaire, et comprenant un module d'émission-réception, qui sous la commande du module de commande, est configuré pour rechercher une sous-bande centrale d'une première bande passante sur laquelle un dispositif d'émission-réception de réseau émet et reçoit des informations, le dispositif d'émission-réception de réseau étant susceptible d'émettre et de recevoir des informations sur une deuxième bande passante supérieure à la première bande passante, et pour effectuer une procédure d'accès aléatoire initiale sur ledit dispositif d'émission-réception de réseau à l'intérieur de ladite sous-bande centrale, les informations de commande et les canaux de commande associés à ladite recherche et à ladite procédure d'accès aléatoire initiale étant confinés à l'intérieur de la sous-bande centrale, pour informer le dispositif d'émission-réception de réseau des capacités de bande passante du dispositif, et pour recevoir des informations de configuration relatives à une sous-bande active du dispositif, la sous-bande active étant définie par une troisième bande passante correspondant aux capacités de bande passante du dispositif, la troisième bande passante étant inférieure ou égale à la deuxième bande passante, et une fréquence centrale de ladite sous-bande active. De la même manière, la présente invention a trait à des dispositifs d'émission-réception de réseau correspondants ainsi qu'à des procédés et à des produits-programmes informatiques respectifs.
PCT/CN2012/070888 2012-02-06 2012-02-06 Procédés et dispositifs destinés à une procédure améliorée d'accès cellulaire WO2013116972A1 (fr)

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CN105766013A (zh) * 2014-11-07 2016-07-13 华为技术有限公司 信息传输方法和装置
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CN110771241B (zh) * 2017-06-16 2024-05-14 华为技术有限公司 带宽资源配置方法、装置和系统

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