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WO2009135499A1 - Structure de canal de commande dynamique pour une utilisation de spectre flexible - Google Patents

Structure de canal de commande dynamique pour une utilisation de spectre flexible Download PDF

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Publication number
WO2009135499A1
WO2009135499A1 PCT/EP2008/003627 EP2008003627W WO2009135499A1 WO 2009135499 A1 WO2009135499 A1 WO 2009135499A1 EP 2008003627 W EP2008003627 W EP 2008003627W WO 2009135499 A1 WO2009135499 A1 WO 2009135499A1
Authority
WO
WIPO (PCT)
Prior art keywords
control channel
control
allocated
control parameter
location
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2008/003627
Other languages
English (en)
Inventor
Frank Frederiksen
Preben Mogensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
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.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2008/003627 priority Critical patent/WO2009135499A1/fr
Publication of WO2009135499A1 publication Critical patent/WO2009135499A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present invention relates to methods, apparatuses, computer program prod- ucts, and a system for providing access to a control channel in a wireless network environment.
  • 3G 3 rd generation
  • Spectral resources in wireless communications systems are assigned to operators in a fixed manner.
  • the scarce spectral resources could be used more efficiently if the assignment to the operators could be made with some flexibility.
  • Flexible Spectrum Use aims at adapting the available spectrum to a network to reflect the changes on the number of subscribers as well as on daily traffic patterns.
  • FSU should enable more versatile operation of the networks, for example, with varying traffic loads in the networks or with some operators providing more focused coverage than others.
  • FSU should provide enough system flexibility towards geographical differences in regulatory spectrum assignments.
  • FSU also aims at easing the deployment of multiple RATs at the launch of the system, even when spectrum is made available gradually according to increasing traffic demands. Such flexibility may turn out to be of particular importance for the systems requiring wide spectrum bands on frequencies suitable for efficient vehicular communications, e.g., below 6 GHz.
  • the FSU concept allows multiple operators to share the same frequency spectrum in a decentralized manner using policy based radio resource optimization. It is expected to be implemented in decentralized and uncoordinated manner, where there will be a lot of independent base stations (BS), potentially belonging to different operators, which are not connected to each other, but on the other hand they are targeting at sharing the same physical spectrum resources according to certain policies.
  • BS base stations
  • the problem of having such a flexible sharing of spectrum among several operators is that the users need to be informed on the current radio parameter configuration of the BS. Further, each user will need to know when and how to access the control channel whenever communication is needed between the BS and a mobile station (MS). This requires transmission of some broadcast information, which will typically be sent on a broadcast channel (BCH).
  • BCH broadcast channel
  • the BCH is seen as a static entity, which is sent on a constant and periodical time- frequency resource and which will contain semi-static information - at least in typical cellular network configurations like for instance GSM (Global system for Mobile communication), UMTS (Universal Mobile Telecommunication System), and LTE (Long Term Evolution).
  • GSM Global system for Mobile communication
  • UMTS Universal Mobile Telecommunication System
  • LTE Long Term Evolution
  • At least one control parameter from a wireless access network to a wireless terminal device; wherein said at least one control parameter defines a location of a control channel allocated to said wireless terminal device within a broadcast signal.
  • an apparatus comprising:
  • setting means for setting a reference point in at least one of a time domain and frequency domain
  • signaling means for generating at least one control parameter which defines a location of a control channel allocated to a wireless terminal device within a broadcast signal, and for signaling at least one control parameter from a wireless access network to said wireless terminal device.
  • an apparatus comprising:
  • setting means for setting a reference point in at least one of a time domain and frequency domain
  • receiving means for receiving at least one control parameter from a wireless access network
  • the above methods may be implemented as a computer program product comprising code means for producing the respective above steps when run on a computer device.
  • the above apparatuses may be implemented as network elements or nodes, ac- cess devices, fixed or mobile terminal devices, or as modules, chips or chip sets provided in these nodes, elements or devices.
  • An access device e.g. base station or the like
  • An access device can change the borders of resource allocation (as long as the reference point is kept constant), as the terminal device will search for alloca- tion grants from a set of candidates which are defined from the reference point. In this way, it is possible for the access device to change spectrum usage according to various access conditions, e.g. current load condition.
  • minimum impact is provided to the majority of terminal devices when an access device changes the used system bandwidth.
  • a kind of fixed control channel definition can thus be provided to all connected terminal devices while at the same time allowing for relatively fast updates of the used system bandwidth.
  • each control channel can be self-defined based on some initial parameters.
  • the definition of the control channel can de- pend only on the starting or reference point (and not on the currently used bandwidth), and a marginal or minimal scheduling of the control channel can be provided.
  • the allocated control channel may be provided in an at least temporarily fixed pattern of control channels allocated to terminal devices connected to the wireless access network. It may point to at least one physical resource provided for data transmission, e.g. uplink transmission and/or downlink transmission.
  • control parameter may be adapted to define the location of the control channel relative to a location of a broadcast channel or relative to a predetermined system offset signaled over the broadcast channel.
  • Fig. 1 shows a schematic diagram indicating a network architecture in which the present invention can be implemented
  • Fig. 2 shows schematic block diagrams of a terminal device and an access device according to embodiments of the present invention
  • Fig. 3 shows a flow diagram of a transmitting-end processing according to an embodiment of the present invention
  • Fig. 4 shows a flow diagram of a receiving-end processing according to an embodiment of the present invention
  • Fig. 5 shows a schematic representation of a control channel structure according to an embodiment
  • Fig. 6 shows a schematic block diagram of a software-based implementation according to an embodiment of the present invention.
  • Fig. 1 shows a schematic diagram of a general network architecture in which the present invention can be implemented.
  • a radio access network 300 e.g., a cellular Universal Mobile Telecommunications System (UMTS) Terrestrial Access Network (UTRAN) according to the Long Term Evolution (LTE) or 3 rd Generation Partnership Project (3GPP) Release 8 standard, provides access to a user equipment (UE) or - more generally - a MS 10 via a first access device 20, such as a GSM and/or UMTS base station device (e.g. Node B) of a first operator, and a second access device 30, such as an enhanced Node B (eNB) according to LTE of a second operator.
  • a first access device 20 such as a GSM and/or UMTS base station device (e.g. Node B) of a first operator
  • a second access device 30 such as an enhanced Node B (eNB) according to LTE of a second operator.
  • eNB enhanced Node B
  • a control channel structure is defined and provided e.g. for the downlink direction from the radio access network 300 to the UE 10, which control channel allows for a variable number of control channels to exist independent of the used bandwidth.
  • the intention is to have a concept which will provide minimum impact to the majority of MS's when an access device (e.g. BS or the like) changes the used system bandwidth.
  • the introduced concept will sacrifice frequency diversity on the control channel for a unitary definition of physical resources defined for each control channel. More specifically, the control channel is suggested to be defined relative to a reference point (in the time or frequency domain) instead of relative to the total used bandwidth.
  • the proposed control channel layout is configured to provide a fixed definition to all connected MSs while at the same time allowing for relatively fast updates of the used system bandwidth. Requiring all connected MSs to simply decode the broadcast channel all time would significantly increase power consumption of the connected MSs - especially if they are only needing traffic on a seldom basis (e.g., voice over internet protocol - VoIP).
  • each control channel is adapted to be self-defined based on some initial parameters (that is, for example, relative to the location of the BCH or relative to a given system offset which could be communicated/indicated over the BCH or any other suitable parameter).
  • Fig. 2 shows schematic block diagrams of a terminal device or terminal (e.g. the MS 10) and a network node or network device (e.g. first or second access devices 20, 30) according to the embodiment of the present invention.
  • a received information is checked by a parameter detection (PD) functionality or unit 15 for provision of a predetermined access control parameter, e.g., based on a predetermined bit pattern, location, or other dedicated characterizing feature of a received data stream.
  • the parameter detection functionality or unit 15 may be provided as a part of an RRC functionality which controls reception operation of a receiver part of a radio frequency (RF) front-end unit 16 which enables wireless transmission and reception via an antenna.
  • RF radio frequency
  • a detected access control parameter is forwarded to an access controller or control unit 14 which derives the allocated control channel based on the access control parameter and under consideration of a pre-defined reference point which has been set previously or which is pro- vided as a default parameter.
  • the access control parameter is selected or set in a signaling functionality or unit (Sl) 22 which is controlled by a control parameter functionality or unit (CP) 21 , e.g., in response to a correspond- ing control input which could for example be supplied by the network operator or stored in a suitable memory device (not shown).
  • the control parameter is incorporated in or added to a control message (e.g. in an access control message or any other suitable message or signaling) in a message control information (MCI) functionality or unit 23 and transmitted via an RF front-end unit 24 and an antenna.
  • MCI message control information
  • Fig. 3 shows a flow diagram of a transmitting-side processing according to an embodiment of the present invention, which could be implemented based on a processing routine in the MS 10 for uplink transmissions or in the access devices 20, 30 for downlink transmissions.
  • step S101 a control channel is allocated or an allocated control channel is determined based on a received or set information.
  • step S102 the access control parameter is determined based on the allocated control channel and the pre-defined reference point.
  • step S103 the access control parameter is signaled in a suitable message to the other transmission end, and it is checked in step S102 whether a sharing indicator is provided.
  • the access control parameter may be part of a dedicated access control signalling to the other transmission end.
  • Fig. 4 shows a flow diagram of a receiving-side processing according to an embodiment of the present invention, which could be implemented based on a proc- essing routine in the MS 10 for downlink transmissions or in the access devices 20, 30 for uplink transmissions.
  • step S101 the access control parameter is detected in a received message or data stream.
  • step S102 an allocated control channel is derived from the access control parameter based on the pre-defined reference point.
  • step S103 the allocated control channel is accesses to derive transmission resources to be used for network connections.
  • Fig. 5 shows a schematic representation of a control channel structure according to an embodiment. As can be gathered from this representation, a set of vertically stacked control channels is indicated on the left side next to a stack of available physical user payload resources which may correspond to different frequencies, channels, time slots, codes, which each points to a set of physical resources for data transmission.
  • Fig. 5 shows a schematic representation of a control channel structure according to an embodiment. As can be gathered from this representation, a set of vertically stacked control channels is indicated on the left side next to a stack of available physical user payload resources which may correspond to different frequencies, channels, time slots, codes, which each points to a set of physical resources for data transmission.
  • Fig. 5 shows a schematic
  • the vertical direction may thus correspond to the frequency domain, time domain, code domain or any other domain suitable to differentiate channels and transmission resources.
  • the first block in Fig. 5 may represent a set of resources that are constructed using any combination of time, frequency, and code domains.
  • a first control channel C1 is defined, which starts directly after the reference point and which points to the similarly vertically hatched resource regions.
  • a successive second control channel C2 is defined which points to similar non-vertically hatched resource regions.
  • each of the control channels may contain a number of sub-channels each capable of pointing to similar non-vertically hatched resource regions. Such a configuration allows to define a set of mother control channel regions, where each mother control channel can carry multiple subchannels for control.
  • a reference point is defined in the time/frequency domain such that each MS listening for the broadcast channel can drive where its allocated or a desired control channel 'starts'.
  • the control channels can be defined in a manner suitable to be derivable from the signalled access control parameter.
  • the control channels may be defined in a linear manner with increasing/decreasing frequency, such that one control channel element is not scattered over a large bandwidth.
  • control channel structure by knowing the reference or starting point of the control channel structure, it is still possible to employ increased coding on top of this such that a control channel for a single user can be constructed by using aggregation of multiple elements for a single control channel.
  • the proposed channel access concept can be applied to both uplink and downlink allocations, so that the borders of allocation can be adjusted (as long as the reference point is kept constant).
  • Allocation grants can be searched from a set of candidates which are defined from the reference point. In this way it is possible to change the spectrum usage according to the current load or other channel conditions.
  • control channel will require some overhead of the control channel, as each single control channel should be able to address the full potential used system bandwidth, while schemes with more information on the actually used bandwidth will be able to utilize more compression on the signalling.
  • control channel(s) could be added above the C2 allocation, if a new user is added in the system. If the used bandwidth is to be reduced for the current active access device, control channel(s) above the non- vertically hatched area could be omitted, so as to reduce data payload carriers (resources) accordingly.
  • Fig. 6 shows a schematic block diagram of an alternative software-based implementation of the above embodiment and its implementation examples for achiev- ing a dynamic control channel structure.
  • the required functionalities can be implemented in a processing unit 210, which may be any processor or computer device with a control unit which performs control based on software routines of a control program stored in a memory 212.
  • the control program may also be stored separately on a computer-readable medium.
  • Program code instructions are fetched from the memory 212 and are loaded to the control unit of the processing unit 210 in order to perform the processing steps of the above functionalities of Figs. 2 to 4, which may be implemented as the above mentioned software routines.
  • the processing steps may be performed on the basis of input data Dl and may generate output data DO.
  • the input data Dl may cor- respond to a desired control channel allocation to be signalled by the access control parameter, and at the receiving side the input data Dl may correspond to the received data stream or message. Furthermore, at the transmitting side the output data DO may correspond to a message or signalling with the added access control parameter and at the receiving side the output data DO may correspond to the derived control channel.
  • the above embodiments may be implemented as a computer pro- gram product comprising code means for generating each individual processing step when run on a computer device or data processor of the first and second access devices 20, 30 or terminal device (e.g. MS 10), respectively.
  • a reference point is set or defined in at least one of a time domain and frequency domain, and at least one control parameter is signaled from the wireless access network to a wireless terminal device, wherein the at least one control parameter defines a location of a control channel allocated to the wireless terminal device within a broadcast signal.
  • the at least one control parameter can be used at the wireless terminal device to derive the location of the allocated control channel within a broadcast signal.

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

Abstract

La présente invention concerne des procédés, des appareils, un système et un produit de programme informatique permettant de fournir un accès à un canal de commande d’un réseau d’accès sans fil. Un point de référence est configuré ou défini dans un domaine temporel et/ou un domaine fréquentiel, et au moins un paramètre de commande est signalé depuis le réseau d’accès sans fil vers un dispositif terminal sans fil, le ou les paramètres de commande définissant un emplacement d’un canal de commande attribué au dispositif terminal sans fil dans un signal de radiodiffusion. Le ou les paramètres de commande peuvent être utilisés sur le dispositif terminal sans fil pour dériver l’emplacement du canal de commande attribué dans un signal de radiodiffusion.
PCT/EP2008/003627 2008-05-06 2008-05-06 Structure de canal de commande dynamique pour une utilisation de spectre flexible Ceased WO2009135499A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/003627 WO2009135499A1 (fr) 2008-05-06 2008-05-06 Structure de canal de commande dynamique pour une utilisation de spectre flexible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/003627 WO2009135499A1 (fr) 2008-05-06 2008-05-06 Structure de canal de commande dynamique pour une utilisation de spectre flexible

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015006756A1 (fr) * 2013-07-12 2015-01-15 Mediatek Singapore Pte. Ltd. Procédé de contrôle d'accès aux canaux dans les réseaux locaux sans fil
WO2018031976A1 (fr) * 2016-08-12 2018-02-15 Motorola Mobility Llc Procédé et appareil comprenant au moins un paramètre pour définir une communication radio plus flexible
CN109391451A (zh) * 2017-08-11 2019-02-26 华为技术有限公司 一种控制信息的发送、接收方法及设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030096614A1 (en) * 2001-11-19 2003-05-22 Toni Paila Method and system of identifying network services
WO2007146131A2 (fr) * 2006-06-15 2007-12-21 Lucent Technologies Inc. Indicateur d'une commande variable de structure de canal pour les émissions dans un système cellulaire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030096614A1 (en) * 2001-11-19 2003-05-22 Toni Paila Method and system of identifying network services
WO2007146131A2 (fr) * 2006-06-15 2007-12-21 Lucent Technologies Inc. Indicateur d'une commande variable de structure de canal pour les émissions dans un système cellulaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SANJAY KUMAR ET AL: "Spectrum sharing for next generation wireless communication networks", 14 February 2008, COGNITIVE RADIO AND ADVANCED SPECTRUM MANAGEMENT, 2008. COGART 2008. FIRST INTERNATIONAL WORKSHOP ON, IEEE, PISCATAWAY, NJ, USA, PAGE(S) 1 - 5, ISBN: 978-1-4244-2139-8, XP031247475 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015006756A1 (fr) * 2013-07-12 2015-01-15 Mediatek Singapore Pte. Ltd. Procédé de contrôle d'accès aux canaux dans les réseaux locaux sans fil
WO2018031976A1 (fr) * 2016-08-12 2018-02-15 Motorola Mobility Llc Procédé et appareil comprenant au moins un paramètre pour définir une communication radio plus flexible
CN109417754A (zh) * 2016-08-12 2019-03-01 摩托罗拉移动有限责任公司 包括用于定义更灵活的无线通信的一个或多个参数的方法与装置
US11528171B2 (en) 2016-08-12 2022-12-13 Motorola Mobility Llc Method and apparatus including one or more parameters for defining a more flexible radio communication
CN109391451A (zh) * 2017-08-11 2019-02-26 华为技术有限公司 一种控制信息的发送、接收方法及设备
CN109391451B (zh) * 2017-08-11 2021-06-01 华为技术有限公司 一种控制信息的发送、接收方法及设备
US11129087B2 (en) 2017-08-11 2021-09-21 Huawei Technologies Co., Ltd. Control information sending/receiving method and device
CN113472498A (zh) * 2017-08-11 2021-10-01 华为技术有限公司 一种控制信息的发送、接收方法及设备
CN113472498B (zh) * 2017-08-11 2023-03-10 华为技术有限公司 一种控制信息的发送、接收方法及设备
US11849386B2 (en) 2017-08-11 2023-12-19 Huawei Technologies Co., Ltd. Control information sending/receiving method and device
US12323902B2 (en) 2017-08-11 2025-06-03 Huawei Technologies Co., Ltd. Control information sending/receiving method and device

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