WO2013104118A1 - Amélioration de rach pour prendre en charge des ue ayant des exigences de largeur de bande différentes - Google Patents

Amélioration de rach pour prendre en charge des ue ayant des exigences de largeur de bande différentes Download PDF

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Publication number
WO2013104118A1
WO2013104118A1 PCT/CN2012/070232 CN2012070232W WO2013104118A1 WO 2013104118 A1 WO2013104118 A1 WO 2013104118A1 CN 2012070232 W CN2012070232 W CN 2012070232W WO 2013104118 A1 WO2013104118 A1 WO 2013104118A1
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WO
WIPO (PCT)
Prior art keywords
access
resource
resources
downlink control
mapping
Prior art date
Application number
PCT/CN2012/070232
Other languages
English (en)
Inventor
Chunyan Gao
Na WEI
Jing HAN
Shuang TAN
Haiming Wang
Wei Bai
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/CN2012/070232 priority Critical patent/WO2013104118A1/fr
Publication of WO2013104118A1 publication Critical patent/WO2013104118A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to methods, devices and computer program products by which a RACH enhancement can be achieved in order to support UEs with different bandwidth requirements, for example UEs with narrow bandwidth such as low cost MTC UEs.
  • Some embodiments of the present invention relate to LTE and LTE-A, although not limiting thereon.
  • MTC Machine-Type Communications
  • GSM/GPRS Global System for Mobile communications
  • Rl-113180 Standards aspects of low-cost MTC LTE UEs. Renesas Mobile Europe Ltd. RANl#66bis, Zhuhai, China, 10-14 October 2011
  • Rl-112912 Overview on low-cost MTC UEs based on LTE. Huawe ' i, HiSilicon, CMCC. RANl#66bis, Zhuhai, China, 10-14 October 2011
  • Rl-113659 (“Considerations on the bandwidth reduction for low cost MTC UE", HuaWei)
  • Narrow bandwidth is considered to be a property for low cost MTC UEs due to low traffic needs.
  • problems to be solved to enable a narrow band UE operating in a wide band system For example, in such a case the detection of conventional PDCCH which spreads over the whole bandwidth becomes a problem [1-2].
  • E-PDCCH had been proposed in current 3GPP discussion to enhance the PDCCH capacity and it is assumed to be sent in the PDSCH region.
  • Such a design can be used to convey DL control in a narrow band to low cost MTC UEs.
  • Another problem is the RACH transmission from low cost MTC UEs. It is proposed in [3] that the bandwidth reduction for DL and UL could be considered separately and the bandwidth reduction in DL provides more reduction than bandwidth reduction in UL. Then, the RACH transmission may be possible to share same resources with normal cellular UEs.
  • the low cost MTC UEs with narrow band can not detect it. Then the eNB should know whether the RACH preamble is transmitted by a low cost UE or a normal UE to help decide where to send the grant for RAR.
  • Two solutions are proposed in [4] as following:
  • Dedicated PRACH resource for low cost UE The disadvantages of these solutions are that allocating dedicated preambles for the low cost UEs will increase the collision probability for both low cost MTC and non-MTC UEs, while dedicated PRACH resource will lead to more resource consumption on the uplink.
  • the present invention addresses such situations and deals in exemplary embodiments to overcome the above-described disadvantages and to support radio access also for low cost user entities (such as MTC UEs) with narrow bandwidth.
  • an apparatus comprising at least one processor, at least one memory including computer program code, and at least one interface configured for communication with at least another apparatus, the at least one processor, with the at least one memory and the computer program code, being configured to cause the apparatus to perform: selecting an access resource of a plurality of access resources available for access to a network control element based on a mapping between the access resources and downlink control resources, and sending an access request on the selected access resource via the interface.
  • an apparatus comprising at least one processor, at least one memory including computer program code, and at least one interface configured for communication with at least another apparatus, the at least one processor, with the at least one memory and the computer program code, being configured to cause the apparatus to perform : receiving an access request on an access resource of a plurality of access resources via the interface, selecting a downlink control resource for sending an access response based on a mapping between the access resources and downlink control resources, and sending the access response on the selected downlink control resource via the interface.
  • a method comprising selecting an access resource of a plurality of access resources available for access to a network control element based on a mapping between the access resources and downlink control resources, and sending an access request on the selected access resource.
  • a method comprising receiving an access request on an access resource of a plurality of access resources, selecting a downlink control resource for sending an access response based on a mapping between the access resources and downlink control resources, and sending the access response on the selected downlink control resource.
  • a computer program product comprising computer-executable computer program code which, when the program is run on a computer (e.g. a computer of an apparatus according to any one of the aforementioned apparatus-related exemplary aspects of the present invention), is configured to cause the computer to carry out the method according to any one of the aforementioned method-related exemplary aspects of the present invention.
  • Such computer program product may comprise or be embodied as a (tangible) computer-readable (storage) medium or the like on which the computer-executable computer program code is stored, and/or the program may be directly loadable into an internal memory of the computer or a processor thereof.
  • Advantageous further developments or modifications of the aforementioned exemplary aspects of the present invention are set out in the following.
  • a mapping between access resources and downlink control resources is provided.
  • a UE will know which downlink control resource it has to monitor for a response to an access request sent on a particular access resource. Therefore, also UEs with a narrow bandwidth are able to receive a response by selecting an appropriate access resource. Hence, UEs with different bandwidth requirements can be supported.
  • FIG. 1 schematically illustrates a UE according to an embodiment of the present invention
  • Fig. 2 schematically illustrates an eNB according to an embodiment of the present invention
  • Fig. 3 shows a flow chart of a process performed by the eNB according to an embodiment of the present invention
  • Fig. 4A and 4B illustrate examples for RACH resource to PDCCH region mappings according to embodiments of the present invention.
  • Fig. 1 illustrates a simplified block diagram of a user equipment (UE) 1 according to an embodiment of the present invention.
  • UE user equipment
  • the UE, and the corresponding apparatus according to the embodiment may consist only of parts of the UE, so that the apparatus may be installed in an UE, for example.
  • the UE is only an example and may be replaced by another suitable network element.
  • the UE 1 comprises at least one processor 11, at least one memory 12 including computer program code and at least one interface 13 configured for communication with at least another apparatus.
  • the processor 11 is configured to select an access resource of a plurality of access resources available for access to a network control element based on a mapping between the access resources and downlink control resources, and to send an access request on the selected access resource via the interface 13.
  • the UE may use a mapping between the access resources (e.g., access resources on an access channel such as a random access channel (RACH) or a physical random access channel (PRACH)) and the downlink control resources (e.g., downlink control channel regions such as regions on a physical downlink control channel (PDCCH)), so that, when a certain access resource is selected, also the downlink control resource is known to the UE.
  • the UE does not have to monitor all downlink control resources (or the whole downlink control channel) for a response to its access request from a network control element (e.g., an eNB), but only has to monitor the downlink control resource which corresponds (according to the mapping) to the selected access resource.
  • the UE may operate with a narrow bandwidth. That is, also UEs with a narrow bandwidth are able to receive a response by selecting an appropriate access resource.
  • UEs with different bandwidth requirements can be supported.
  • Fig. 2 shows an eNB 2 according to an embodiment of the present invention. It is noted that the eNB, and the corresponding apparatus according to the embodiment may consist only of parts of the eNB, so that the apparatus may be installed in an eNB, for example. Moreover, also the eNB is only an example and may be replaced by another suitable network control element.
  • the eNB 2 comprises at least one processor 21, at least one memory 22 including computer program code and at least one interface 23 configured for communication with at least another apparatus.
  • the processor 21 is configured to receive an access request on an access resource of a plurality of access resources via the interface 23, to select an a downlink control resource for sending an access response based on a mapping between the access resources and downlink control resources, and to send the access response on the selected downlink control resource via the interface 23.
  • the processor 21, the memory 22 and the interface 23 may be inter-connected by a suitable connection 24, e.g., a bus or the like.
  • a suitable connection e.g., a bus or the like.
  • the apparatus may comprise more than one processor, more than one memory and/or more than one interface, if this is suitable for a particular structure.
  • Fig. 3 shows a flow chart for describing the basic operations according to the embodiment described above.
  • a UE selects a RACH resource (as an example for the access resource as mentioned above) according to the mapping described above.
  • the UE sends a preamble (as an example for an access request) on the selected RACH resource to an eNB (e.g. eNB 2 shown in Fig. 2).
  • the RACH resource may be a RACH preamble, so that in SI a RACH preamble is selected and in S2, the selected preamble is sent to the eNB.
  • the eNB determines a PDCCH region (as an example for a downlink control resource as mentioned above) for a RAR (as an example for an access request) based on the mapping.
  • the eNB transmits the RAR to the UE on the selected PDCCH region.
  • the normal access procedure can continue, for example by exchanging RRC signaling (indicated in S5 and S6).
  • mapping between the access resources and the downlink control resources may be provided for example by network configuration, and/or may be broadcasted by the eNB, for example.
  • the processes according to the embodiments described above are described in the following in more detail by referring to specific examples.
  • embodiments of the present invention provide an enhancement for RACH in LTE, In order to support low cost MTC UEs with narrow bandwidth, wherein this enhancement enables the low cost MTC UEs to detect the corresponding RAR and enables PRACH resource sharing with normal UEs, and impact to legacy UEs can be avoided.
  • legacy UEs stands for those UEs which do not support E-PDCCH; and new UE stands for those UEs which support E- PDCCH.
  • a mapping is defined between the RACH resource (preamble or T-F resource) and the PDCCH region for RAR grant.
  • mapping is implicitly predefined or explicitly signaled by higher layer signaling.
  • UEs Based on configured PDCCH/E-PDCCH region to detect, UEs select the RACH resource/preamble to use.
  • Some UEs can be configured to detect common search space in multiple control regions.
  • Legacy UEs are configured RACH resource which maps to RAR grant in normal PDCCH.
  • Figs. 4A and 4B illustrates examples for a RACH resource to PDCCH region mappings.
  • the RACH resources are divided into some subsets (as examples for groups of access resources), and each subset maps to different PDCCH regions for RAR scheduling detection.
  • the RACH resource can be divided in preamble, in subframe, in frequency, or divided using a combination of these solutions.
  • Fig. 4A shows one example of RACH resource division based on preambles
  • Fig. 4B shows one example of division based on subframe.
  • there can be a combination e.g., RACH resource in some subframe is divided into subsets, or, RACH resource in some PRBs is divided into subsets.
  • Such RACH resource division can be made transparent to legacy UEs by configuring different RACH resources to them.
  • the legacy UEs can be configured with the RACH resource in subframes indicated by horizontal hatching. That is, the legacy UEs will select to send RACH in subframes which map to RAR in legacy PDCCH region in a later subframe.
  • they can be configured to monitor common search space in both normal PDCCH and E-PDCCH and this provide more flexibility for the RACH resource selection.
  • Low cost MTC UEs know which is the RACH resource whose RAR will be sent in the detectable control region, then can choose the RACH resource properly.
  • the low cost MTC is not the only use case for this proposal, rather, this proposal also helps to handle the RAR for legacy and new release UEs.
  • this proposal there is no dedicated RACH resource for legacy or low cost MTC UEs, and the RACH resource can be shared by UEs configured with multiple control regions.
  • the problem of RAR detection for different UEs e.g., UEs not capable to detect some control region
  • a shared RACH resource is provided for UEs which reduce the collision possibility via control region configuration.
  • the invention is not limited to this. That is, the solution as described according to embodiments may be applied to any case in which an access request is sent on a certain access resource, and an access response is sent on a downlink control resource, so that a mapping therebetween can be established.
  • Embodiments of the present invention may be implemented in software, hardware, application logic or a combination of software, hardware and application logic.
  • the software, application logic and/or hardware generally, but not exclusively, may reside on the devices' modem module.
  • 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 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, WCDMA, WIMAX and WLAN and can advantageously be implemented in user equipments or smart phones, or personal computers connectable to such networks. That is, it can be implemented as/in chipsets to connected devices, and/or modems or other modules thereof. If desired, at least some of 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. It is to be understood that any of the above modifications can be applied singly or in combination to the respective aspects and/or embodiments to which they refer, unless they are explicitly stated as excluding alternatives.
  • an apparatus which comprises means for selecting an access resource of a plurality of access resources available for access to a network control element based on a mapping between the access resources and downlink control resources, and means for sending an access request on the selected access resource.
  • an apparatus which comprises means for receiving an access request on an access resource of a plurality of access resources, means for selecting a downlink control resource for sending an access response based on a mapping between the access resources and downlink control resources, and means for sending the access response on the selected downlink control resource.

Abstract

Des modes de réalisation de l'invention concernent une mise en correspondance entre des ressources d'accès et des ressources de commande de liaison descendante. En conséquence, un appareil tel qu'un équipement utilisateur (UE) peut sélectionner une ressource d'accès parmi une pluralité de ressources d'accès disponibles pour accéder à un élément de commande de réseau sur la base de cette mise en correspondance, et envoyer une requête d'accès sur la ressource d'accès sélectionnée.
PCT/CN2012/070232 2012-01-11 2012-01-11 Amélioration de rach pour prendre en charge des ue ayant des exigences de largeur de bande différentes WO2013104118A1 (fr)

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WO2018120103A1 (fr) * 2016-12-30 2018-07-05 广东欧珀移动通信有限公司 Procédé et appareil pour accès aléatoire

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CN105264999A (zh) * 2013-09-16 2016-01-20 华为技术有限公司 随机接入中预先确定资源的方法、用户设备和基站
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WO2018120103A1 (fr) * 2016-12-30 2018-07-05 广东欧珀移动通信有限公司 Procédé et appareil pour accès aléatoire
CN109644432A (zh) * 2016-12-30 2019-04-16 Oppo广东移动通信有限公司 用于随机接入的方法和装置
CN109644432B (zh) * 2016-12-30 2021-01-12 Oppo广东移动通信有限公司 用于随机接入的方法和装置

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