WO2019095191A1 - Procédé et appareil de fourniture de contrôle d'accès - Google Patents

Procédé et appareil de fourniture de contrôle d'accès Download PDF

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Publication number
WO2019095191A1
WO2019095191A1 PCT/CN2017/111324 CN2017111324W WO2019095191A1 WO 2019095191 A1 WO2019095191 A1 WO 2019095191A1 CN 2017111324 W CN2017111324 W CN 2017111324W WO 2019095191 A1 WO2019095191 A1 WO 2019095191A1
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WIPO (PCT)
Prior art keywords
user device
access
barring
level
coverage enhancement
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PCT/CN2017/111324
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English (en)
Inventor
Haitao Li
Yanji Zhang
Jussi-Pekka Koskinen
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Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201780097020.7A priority Critical patent/CN111373815A/zh
Priority to PCT/CN2017/111324 priority patent/WO2019095191A1/fr
Publication of WO2019095191A1 publication Critical patent/WO2019095191A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed

Definitions

  • Some embodiments relate to a method and apparatus providing an access control mechanism.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as user terminals, base stations and/or other nodes by providing carriers between the various entities involved in the communications path.
  • a communication system can be provided for example by means of a communication network and one or more compatible communication devices.
  • the communication sessions may comprise, for example, communicationof data for carrying communications such as voice, video, electronic mail (email) , text message, multimedia and/or content data and so on.
  • Non-limiting examples of services provided comprise two-way or multi-way calls, data communication or multimedia services and access to a data network system, such as the Internet.
  • wireless communication system at least a part of a communication session between at least two stations occurs over a wireless link.
  • wireless systems comprise public land mobile networks (PLMN) , satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN) .
  • PLMN public land mobile networks
  • WLAN wireless local area networks
  • the wireless systems can typically be divided into cells, and are therefore often referred to as cellular systems.
  • a user can access the communication system by means of an appropriate communication device or terminal.
  • a communication device of a user may be referred to as user equipment (UE) or user device.
  • UE user equipment
  • a communication device is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other users.
  • the communication device may access a carrier provided by a station, for example a base station of a cell, and transmit and/or receive communications on the carrier.
  • the communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved. Communication protocols and/or parameters which shall be used for the connection are also typically defined.
  • UTRAN 3G radio
  • Other examples of communication systems are the long-term evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) radio-access technology and so-called 5G or New Radio networks. Standardization of 5G or New Radio networks is currently under discussion. LTE is being standardized by the 3rd Generation Partnership Project (3GPP) .
  • 3GPP 3rd Generation Partnership Project
  • a method comprising: applying at a user device an access policy for coverage enhancement level access barring, said access policy being dependent on a status associated with said user device.
  • the status may be a mobility status of said user device.
  • the status may comprise said user device being one of a stationary user device and mobile user device.
  • the method may comprise receiving a first access policy for use when the user device is mobile and a second access policy for when the user device is stationary and applying the first or the second access policy in dependence on if the user device is stationary or mobile.
  • the method may comprise determining if said user device is mobile device is stationary or mobile and applying a respective one of the first and second access policies in response to said determining.
  • the status may be is a radio resource management monitoring state.
  • the status may be a radio resource management neighbour cell monitoring state.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, one in which neighbour cell measurements are performed on a first time scale, and one in which neighbour cell measurements are performed on a second time scale faster than the first time scale.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, relaxed monitoring, and normal monitoring.
  • the method may comprise receiving said access policy at said user device.
  • the method may comprise determining at the user device a status and selecting an access policy from a plurality of access policies in dependence on the determined status.
  • the policy which is applied may be associated with a given one or more coverage enhancement levels.
  • the method may comprise determining at the user device that a current coverage enhancement level for said user device is barred and in response to said determining, attempting by said user device to access using a different coverage enhancement level.
  • this may be carried out by a stationary UE, to avoid it being stuck/barred in an overloaded CE level.
  • the method may comprise receiving at said user device information which indicates if said user device is permitted to use a different coverage enhancement level when the current coverage enhancement level for said user device is barred.
  • this may be carried out by a stationary UE, to avoid it being stuck/barred in an overloaded CE level.
  • the access policy may comprises information about which of a plurality of control procedures is to be performed.
  • the information may be provided for a plurality of different coverage enhancement levels.
  • Different information may be provided for a plurality of different coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels when said user device is stationary.
  • the information may comprise information indicating if a first barring procedure is to be skipped and in response to said information indicating that the first barring procedure is to be skipped performing a second barring procedure.
  • This may be associated with a stationary user device and/or a mobile device, depending on for example network strategy. This may be associated with no monitoring and/or relaxed monitoring and/or normal monitoring.
  • the information may comprise information indicating that a second barring procedure is not required and performing a first barring procedure.
  • This may be associated with a stationary user device and/or a mobile user device, depending on for example network strategy. This may be associated with no monitoring and/or relaxed monitoring and/or normal monitoring.
  • the first barring procedure may comprise a cell level barring mechanism.
  • This may be referred to as a “legacy” procedure in some scenarios.
  • this may be pre Rel-15 in the context of 3GPP.
  • the second barring procedure may comprise a coverage enhancement level barring.
  • the information may comprise at least one flag.
  • the applied policy may comprise barring threshold information for one or more coverage enhancement levels.
  • This may for example be associated with a stationary user device, to allow a stationary user device to retry a different CE level when the current CE level is barred.
  • an apparatus in a user device comprising at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: apply an access policy for coverage enhancement level access barring, said access policy being dependent on a status associated with said user device.
  • the status may be a mobility status of said user device.
  • the status may comprise said user device being one of a stationary user device and mobile user device.
  • the at least one memory and the computer program code may be configured to, with the at least one processor to receive a first access policy for use when the user device is mobile and a second access policy for when the user device is stationary and applying the first or the second access policy in dependence on if the user device is stationary or mobile.
  • the at least one memory and the computer program code may be configured to, with the at least one processor determine if said user device is mobile device is stationary or mobile and applying a respective one of the first and second access policies in response to said determining.
  • the status may be is a radio resource management monitoring state.
  • the status may be a radio resource management neighbour cell monitoring state.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, one in which neighbour cell measurements are performed on a first time scale, and one in which neighbour cell measurements are performed on a second time scale faster than the first time scale.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, relaxed monitoring, and normal monitoring.
  • the at least one memory and the computer program code may be configured to, with the at least one processor receive said access policy at said user device.
  • the at least one memory and the computer program code may be configured to, with the at least one processor determine a status and selecting an access policy from a plurality of access policies in dependence on the determined status.
  • the policy which is applied may be associated with a given one or more coverage enhancement levels.
  • the at least one memory and the computer program code may be configured to, with the at least one processor determine that a current coverage enhancement level is barred and in response to said determining, attempt to access using a different coverage enhancement level.
  • this may be carried out by a stationary UE, to avoid it being stuck/barred in an overloaded CE level.
  • the at least one memory and the computer program code may be configured to, with the at least one processor receive information which indicates if said user device is permitted to use a different coverage enhancement level when the current coverage enhancement level is barred.
  • this may be carried out by a stationary UE, to avoid it being stuck/barred in an overloaded CE level.
  • the access policy may comprises information about which of a plurality of control procedures is to be performed.
  • the information may be provided for a plurality of different coverage enhancement levels.
  • Different information may be provided for a plurality of different coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels when said user device is stationary.
  • the information may comprise information indicating if a first barring procedure is to be skipped and in response to said information indicating that the first barring procedure is to be skipped performing a second barring procedure.
  • This may be associated with a stationary user device and/or a mobile device, depending on for example network strategy. This may be associated with no monitoring and/or relaxed monitoring and/or normal monitoring.
  • the information may comprise information indicating that a second barring procedure is not required and performing a first barring procedure.
  • This may be associated with a stationary user device and/or a mobile user device, depending on for example network strategy. This may be associated with no monitoring and/or relaxed monitoring and/or normal monitoring.
  • the first barring procedure may comprise a cell level barring mechanism.
  • This may be referred to as a “legacy” procedure in some scenarios.
  • this may be pre Rel-15 in the context of 3GPP.
  • the second barring procedure may comprise a coverage enhancement level barring.
  • the information may comprise at least one flag.
  • the applied policy may comprise barring threshold information for one or more coverage enhancement levels.
  • This may for example be associated with a stationary user device, to allow a stationary user device to retry a different CE level when the current CE level is barred.
  • an apparatus in an access node comprising at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: cause transmission of an access policy to a user for coverage enhancement level access barring, said access policy being dependent on a status associated with said user device.
  • the status may be a mobility status of said user device.
  • the status may comprise said user device being one of a stationary user device and mobile user device.
  • the at least one memory and the computer program code may be configured to, with the at least one processor to cause transmitting of a first access policy for use when the user device is mobile and a second access policy for when the user device is stationary and applying the first or the second access policy in dependence on if the user device is stationary or mobile.
  • the at least one memory and the computer program code may be configured to, with the at least one processor to determine if said user device is mobile device is stationary or mobile and providing a respective one of the first and second access policies in response to said determining.
  • the status may be is a radio resource management monitoring state.
  • the status may be a radio resource management neighbour cell monitoring state.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, one in which neighbour cell measurements are performed on a first time scale, and one in which neighbour cell measurements are performed on a second time scale faster than the first time scale.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, relaxed monitoring, and normal monitoring.
  • the policy which is applied may be associated with a given one or more coverage enhancement levels.
  • the at least one memory and the computer program code may be configured to, with the at least one processor to cause transmission to said user device information which indicates if said user device is permitted to use a different coverage enhancement level when the current coverage enhancement level for said user device is barred.
  • this may be carried out by a stationary UE, to avoid it being stuck/barred in an overloaded CE level.
  • the access policy may comprises information about which of a plurality of control procedures is to be performed.
  • the information may be provided for a plurality of different coverage enhancement levels.
  • Different information may be provided for a plurality of different coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels when said user device is stationary.
  • the information may comprise information indicating if a first barring procedure is to be skipped and in response to said information indicating that the first barring procedure is to be skipped performing a second barring procedure.
  • This may be associated with a stationary user device and/or a mobile device, depending on for example network strategy.
  • the information may comprise information indicating that a second barring procedure is not required and performing a first barring procedure.
  • This may be associated with a stationary user device and/or a mobile user device, depending on for example network strategy.
  • the first barring procedure may comprise a cell level barring mechanism.
  • This may be referred to as a “legacy” procedure in some scenarios.
  • this may be pre Rel-15 in the context of 3GPP.
  • the second barring procedure may comprise a coverage enhancement level barring.
  • the information may comprise at least one flag.
  • the applied policy may comprise barring threshold information for one or more coverage enhancement levels.
  • The may for example be associated with a stationary user device, to allow a stationary user device to retry a different CE level when the current CE level is barred.
  • a method comprising: causing transmission of an access policy to a user for coverage enhancement level access barring, said access policy being dependent on a status associated with said user device.
  • the status may be a mobility status of said user device.
  • the status may comprise said user device being one of a stationary user device and mobile user device.
  • the method may comprise causing transmitting of a first access policy for use when the user device is mobile and a second access policy for when the user device is stationary and applying the first or the second access policy in dependence on if the user device is stationary or mobile.
  • the method may comprise determining if said user device is mobile device is stationary or mobile and providing a respective one of the first and second access policies in response to said determining.
  • the status may be is a radio resource management monitoring state.
  • the status may be a radio resource management neighbour cell monitoring state.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, one in which neighbour cell measurements are performed on a first time scale, and one in which neighbour cell measurements are performed on a second time scale faster than the first time scale.
  • the neighbour cell monitoring state may comprise one of: one in which no monitoring is performed, relaxed monitoring, and normal monitoring.
  • the policy which is applied may be associated with a given one or more coverage enhancement levels.
  • the method may comprise causing transmission to said user device information which indicates if said user device is permitted to use a different coverage enhancement level when the current coverage enhancement level for said user device is barred.
  • this may be carried out by a stationary UE, to avoid it being stuck/barred in an overloaded CE level.
  • the access policy may comprises information about which of a plurality of control procedures is to be performed.
  • the information may be provided for a plurality of different coverage enhancement levels.
  • Different information may be provided for a plurality of different coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels.
  • the information may comprise information indicating that coverage enhancement level barring is not performed for one or more coverage enhancement levels when said user device is stationary.
  • the information may comprise information indicating if a first barring procedure is to be skipped and in response to said information indicating that the first barring procedure is to be skipped performing a second barring procedure.
  • This may be associated with a stationary user device and/or a mobile device, depending on for example network strategy.
  • the information may comprise information indicating that a second barring procedure is not required and performing a first barring procedure.
  • This may be associated with a stationary user device and/or a mobile user device, depending on for example network strategy.
  • the first barring procedure may comprise a cell level barring mechanism.
  • This may be referred to as a “legacy” procedure in some scenarios.
  • this may be pre Rel-15 in the context of 3GPP.
  • the second barring procedure may comprise a coverage enhancement level barring.
  • the information may comprise at least one flag.
  • the applied policy may comprise barring threshold information for one or more coverage enhancement levels.
  • The may for example be associated with a stationary user device, to allow a stationary user device to retry a different CE level when the current CE level is barred.
  • a computer program comprising program code means adapted to perform the method (s) may also be provided.
  • the computer program may be stored and/or otherwise embodied by means of a carrier medium.
  • the computer program may be provided on a non transitory computer program carrying medium.
  • Figure 1 shows a schematic diagram of an example communication system comprising a base station and a plurality of communication devices
  • Figure 2 shows a schematic diagram of an example mobile communication device
  • Figure 3 shows a schematic diagram of an example control apparatus
  • Figure 4 shows a method flow
  • a wireless communication devices for example, user equipment (UE) 102, 104, 105 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving wireless infrastructure node or point.
  • a node can be, for example, a base station or an eNodeB (eNB) , or in a 5G system a Next Generation NodeB (gNB) , or other wireless infrastructure node.
  • eNB eNodeB
  • gNB Next Generation NodeB
  • Base stations are typically controlled by at least one appropriate controller apparatus, so as to enable operation thereof and management of mobile communication devices in communication with the base stations.
  • the controller apparatus may be located in a radio access network (e.g.
  • wireless communication system 100 or in a core network (CN) (not shown) and may be implemented as one central apparatus or its functionality may be distributed over several apparatus.
  • the controller apparatus may be part of the base station and/or provided by a separate entity such as a Radio Network Controller.
  • control apparatus 108 and 109 are shown to control the respective macro level base stations 106 and 107.
  • the control apparatus may additionally or alternatively be provided in a radio network controller.
  • Other examples of radio access system comprise those provided by base stations of systems that are based on technologies such as 5G or new radio, wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access) .
  • a base station can provide coverage for an entire cell or similar radio service area.
  • base stations 106 and 107 are shown as connected to a wider communications network 113 via gateway 112.
  • a further gateway function may be provided to connect to another network.
  • the smaller base stations 116, 118 and 120 may also be connected to the network 113, for example by a separate gateway function and/or via the controllers of the macro level stations.
  • the base stations 116, 118 and 120 may be pico or femto level base stations or the like. In the example, stations 116 and 118 are connected via a gateway 111 whilst station 120 connects via the controller apparatus 108. In some embodiments, the smaller stations may not be provided.
  • a possible wireless communication device will now be described in more detail with reference to Figure 2 showing a schematic, partially sectioned view of a communication device 200.
  • a communication device is often referred to as user equipment (UE) or terminal.
  • An appropriate mobile communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise a mobile station (MS) or mobile device such as a mobile phone or what is known as a 's mart phone', a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle) , personal data assistant (PDA) or a tablet provided with wireless communication capabilities, or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • a mobile communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email) , text message, multimedia and so on. Users may thus be offered and provided numerous services via their communication devices. Non-limiting examples of these services comprise two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. Users may also be provided broadcast or multicast data. Non-limiting examples of the content comprise downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • a wireless communication device may be for example a mobile device, that is, a device not fixed to a particular location, or it may be a stationary device.
  • the wireless device may need human interaction for communication, or may not need human interaction for communication.
  • the latter devices are sometimes referred to as MTC (machine type communication) devices.
  • MTC machine type communication
  • Such devices may only have a subset of the components and/or simplified versions of the components shown in Figure 2.
  • the terms UE are used to refer to any type of wireless communication device.
  • a mixture of different types of device may be configured to operate within network.
  • the wireless device 200 may receive signals over an air or radio interface 207 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 206.
  • the transceiver apparatus 206 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the wireless device.
  • a wireless device is typically provided with at least one data processing entity 201, at least one memory 202 and other possible components 203 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 204.
  • a user may control the operation of the wireless device by means of a suitable user interface such as key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a suitable user interface such as key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 208, a speaker and a microphone may optionally be provided.
  • a wireless communication device may optionally comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • the communication devices 102, 104, 105 may access the communication system based on various access techniques.
  • FIG. 3 shows an example of a apparatus which may be provided in a base station.
  • the apparatus 300 comprises at least one memory 301, at least one data processing unit 302, 303 and an input/output interface 304. Via the interface the control apparatus can be coupled to a receiver and a transmitter of the base station.
  • the receiver and/or the transmitter may be implemented as a radio front end or a remote radio head.
  • the control apparatus 300 or processor 201 can be configured to execute an appropriate software code to provide the control functions.
  • a narrowband LTE system may support machine-type communications (MTC) or machine-to-machine communications (M2M) .
  • MTC machine-type communications
  • M2M machine-to-machine communications
  • This narrowband LTE system may be sometimes referred to as LTE-M.
  • loT Internet of Things
  • the loT comprises inter-working of connected devices including, but not limited to, user equipment, vehicles, domestic appliances etc.
  • Narrowband loT (NB-loT) is a radio technology standard for enabling loT devices to communicate using a cellular network. Enhancements to NB-loT are ongoing.
  • An aim for NB-loT enhancements and LTE-M is to enhance access barring. This may be for improving access and/or load control in idle mode e.g. CE (coverage enhancement) -level based access barring.
  • CE coverage enhancement
  • CE has been proposed.
  • CE has been proposed to address issues such as the need for extending the range and/or coverage associated with a base station.
  • CE may be achieved by increasing for example the number of repetitions of transmission.
  • CE may have a plurality of different levels. The number of different levels may be any suitable number.
  • current proposals have up to 4 levels for LTE-M and up to 3 levels for NB-loT. Different proposals may have different levels. Each level may be associated with a different number of repetition of transmission.
  • access by a UE to a particular cell can be barred or restricted in dependence on the CE level and/or mode.
  • the UEs with a higher CF level may require more resources than a UE with a lower CE level.
  • the probability of a UE getting resources may be the same regardless of the CE level. In other embodiments, the probability of a UE getting resources may be dependent on the CE level.
  • the NB-loT access control feature is referred to as access barring AB separately from LTE access control mechanisms.
  • This access barring may be intended for delay-tolerant services, e.g. Machine Type Communication (MTC) services without strict delay requirements.
  • MTC Machine Type Communication
  • a barring bitmap is may be transmitted in system information block. It has been proposed to transmit this information in a system information block SIB for the narrow band. This information may be sent separately from other system information.
  • SIB14 or SIB2 has been proposed to send this bitmap information. This bitmap information may only be transmitted only when access control is enabled.
  • a base station may restrict the access for some CE level users to avoid the overload.
  • Different CE levels may be associated with different radio resources.
  • the PRACH (physical random access channel) resource may be separate for different CE levels. This may be those CE level (s) or modes associated with a relatively high repetition rate. Fairness issues might arise for the UEs which always have poor coverage, e.g. UEs in the form of stationary underground meters. If UEs are not differentiated when accessing the NW, those stationary UEs may not be able to have better chance to set up the connection as other UEs which just happen to move to the edge of the cell. Then meters report might be delayed or lost.
  • a stationary UE may be stuck on the most robust repetition level (that is with the most repetitions) .
  • That CE level may be level 3. This may be because congestion on that level at time of high load. For example a proportion of mobile UEs are also relying on that same level. This might least to stationary UEs being stuck on that CE level because those UEs are in a static, non-changing radio environment while the mobile UEs may expect a dynamic radio environment to take the UE out of that CE level.
  • different access probabilities for stationary UEs and mobile UEs may be provided so that a proportion of the mobile UEs may be moved from the CE level in question This may be achieved by barring a certain proportion of those mobile UEs from that CE level. This may keep the congestion down from the stationary UEs in that CE level.
  • These probabilities may be on a per CE level basis or applied for a CE level specifically.
  • the base station may provide the different access probabilities to a UE.
  • the base station may provide a common probability for each CE level or a specific CE level, and an extra proportion factor to the stationary UE, from which the access probability for the stationary UE could be derived.
  • the UE may itself determine if it stationary or mobile and then apply the appropriate access probability. Alternatively or additionally, this may be determined by the base station and signalled to the UE.
  • Access barring may address congestion on the PRACH.
  • eMTC enhanced MTC
  • NB-loT the PRACH for each CE level uses different resources. This may provide a finer granularity for network to perform congestion control on each CE level.
  • an access probability (sometimes referred to as barring factor) and an access class barring time.
  • barring factor an access probability
  • an access class barring time When a UE request access, it derives a random number between 0 and 1 and compares that number to an access probability. When the number is less than the access probability, the device proceeds to the random access procedure. Otherwise the device is barred for a time duration before it can attempt to access the network again.
  • Some embodiments may relate to the access barring mechanism for one or more of NB-loT, LTE-M and NR UEs. Of course other embodiments may relate to any other suitable standard.
  • Some embodiments may distinguish the stationary UEs from the mobile UEs and apply different access policies for the stationary UEs and the mobile UEs. Any suitable parameter or parameter may be used to distinguish the UEs. For example, this may be based on a serving cell's RSRP (reference signal received power) change or cell reselection count/result. In some embodiments, different access policies for the stationary UEs and the mobile UEs may be applied.
  • RSRP reference signal received power
  • Some embodiments may provide one or more options for enhancing the access barring mechanism for different CE levels.
  • different barring factors/probabilities for different CE levels are signalled to the UE. This may allow the network to set different access probabilities according to an estimation on UE's population/distribution and/or accessing activities in each CE level.
  • an indication as to whether a UE is allowed to try to access the cell in another CE level if current CE level is barred is provided. This is because traffic load in different CE levels might be independent and one CE level which is overloaded does not necessarily mean other CE levels are also overloaded. This may allow a UE to access the network via a lighter loaded CE level, when the cell is barred in the current over-loaded CE level.
  • a skip indication is provided to allow the UE to skip the existing barring mechanism and to directly perform the CE level based access barring. If for some reason, the network has to set the existing barring factor relatively high, then the UE will most likely not pass the access control even if for some CE levels the CE level specific barring factor is not that high. In this case, skipping the existing barring mechanism may help the UE to pass the access control and apply the radio resource more efficiently.
  • the UE may be signalled which access barring mechanism the UE shall follow.
  • the base station may define the access barring mechanism in accordance with the strategy that the base station is following.
  • the UE may be signalled that ignoring the CE level based barring is allowed for a certain CE level. For example, for stationary UEs in an overloaded CE level, if the network wants to let the UE have access, then ignoring the CE level based barring can avoid the UE from being barred in this CE level.
  • the UE may determine that the UE is allowed to ignore the CE level based barring. For example, as explained above, stationary UEs may benefit from this, otherwise, stationary UEs will always be barred by an over-loaded CE level.
  • the barring functionality may be based on RRM (radio resource management monitoring) .
  • Signalling from the access point or base station may be via a broadcast communication and/or via dedicated signalling.
  • a base station will broadcast or signal the barring factors for different CE levels. This may be to all the UEs in the cell, to all the LTE-M UEs in a cell, to all NB-loT UEs in a cell or to a specific UE. This contrasts with prior arrangements where one access control probability for the UE is provided.
  • This barring factor is used for access control, and is different from the PRACH's weighing factors for anchor/non-anchor PRBs (physical resource blocks) . These weighing factors may be broadcast to the UEs and may be used by UE to select the PRB on which it transmits random access preambles.
  • step S2 it is determined if the UE passes the access control of a given level.
  • step S3 where only after a UE passes the access control of a given CE level, will the UE be able to select the PRBs to do a RA (random access procedure) on that CE level, based on the weighting factors of anchor/non-anchor PRBs.
  • the given CE level may be selected by the UE in dependence on one or more factors. For example the CE level may be selected based on a measured RSRP reference signal received power and/or RSRQ reference signal received quality and/or the like. In other embodiments, the CE level may be selected alternatively or additionally in dependence on the amount of data the UE has to send. In other embodiments, the base station may determine the CE level based on one or more factors. The selected CE level, if selected by the base station, may be signalled to the UE.
  • the base station may signal to a UE if that UE is allowed to try to access the cell in another CE level.
  • the base station may indicate that the UE is allowed to try a different, deeper (higher repetition rate) CE level, if the cell is barred in the current CE level, e.g. the one associated with the measured RSRP result.
  • the allowing/disallowing indication can be signalled per cell or per CE level. This may be beneficial because traffic load in different CE levels might be independent and one CE level being overloaded does not necessarily mean other CE levels are also overloaded.
  • the information may be transmitted with the information in step S1 or may be separately transmitted. In some embodiments, the information of step S1 may be broadcast and this additional information about whether the UE is allowed to access the cell in another CE level may be signalled to the UE.
  • step S4 it is determined if the UE is allowed to try another level.
  • next step is S5 where it is determined if the UE passes the access control of the new CE level.
  • next step is S3 and if not the next step is step S4.
  • N is an integer greater than or equal to one.
  • the allowing/disallowing to try another CE level may alternatively or additionally determined based on a barring factor threshold configured by the base station. For example, only those CE levels with a sufficiently Iow barring factor, e.g. below a barring factor threshold, are allowed to retrying for access with another CE level.
  • This threshold may be signalled by the base station. For example this threshold may be broadcast by the base station together with the barring factors for each CE level. For example, a CE level, when the barring factor is lower than say 0.3, can be allowed for retrying for access.
  • the base station may configure UE to skip the existing legacy barring mechanism and to directly perform the CE level based access barring check such as discussed in relation to Figure 4.
  • the legacy barring mechanism is a cell level barring mechanism. Whenever a UE wants to access the cell, the UE draws a random number and sees whether it is smaller than the cell level barring factor. If yes, the UE is allowed to perform a RA procedure; if not, the cell is barred.
  • the CE level access barring may be disabled according to the indication from base station for a particular CE level, e.g. when barring factors are too high and thus block the access.
  • the indication may be a flag or indication for a CE level. The purpose of this indication may be to disable the access barring for this CE level. This means that as long as UE passes the legacy (cell level) barring control, the UE does not need to perform the barring control for this CE level.
  • the UE may skip the legacy (cell level) barring control, and perform the CE level barring control directly. This could be indicated by base station.
  • the base station may indicate whether ignoring the CE level based access control is allowed for a certain CE level. This may be provided in system information broadcasting or the like. When the CE level based access control can be ignored and/or what would happen when the CE level based access control is ignored may be determined by the UE according to a criterion or criteria defined by the base station.
  • the UE may determine whether it can ignore the CE level based access control according to the evaluation of its stationary state, e.g. by detecting a change of its serving cell RSRP or a cell reselection count.
  • the UE may perform the normal AC check during the initial access.
  • An aim may to avoid the fairness issue for those stationary UEs which are always requiring a deeper CF level. This means as long as a UE passes the normal AC check, it is allowed to access the cell using this CE level without performing further the CE level based access control for this CE level.
  • a UE may ignore the CE level based AC and perform the normal AC procedure if the UE satisfies one or more of the following conditions:
  • the UE tries a connection setup with the same cell as the last serving cell in connected state
  • the UE worked in a certain CE level which is indicated by base station during connected state
  • the UE keeps in the same CE level when initiating the state transition
  • a different barring behaviour may be based on the UE RRM monitoring i.e. the UE applies barring based on the UE RRM neighbour cell monitoring state e.g. as follows
  • the UE may select legacy barring, Alternatively or additionally the barring check is performed only for some CE level (s)
  • the UE may select CE level barring.
  • the barring check is performed only for some CE level (s) .
  • the UE could select both barring mechanisms.
  • the UE may sequentially perform AC: first, legacy cell level AC, if passed, then CE level AC, if passed, then UE is allowed to do RA procedure for this CE level.
  • the barring check is performed only for some CE level (s) .
  • only one of the monitoring states are provided. It should be appreciated that in some embodiments, two or more of these monitoring states may be provided.
  • the UE may dynamically determines whether to apply relaxed monitoring by the change in serving cell RSRP or the like. If there are configuration parameters for the dynamic determination whether to apply relaxed monitoring, those may be provided by means of system information. Relaxed monitoring may applicable when the UE is below neighbour cell measurement thresholds such as Sintrasearch or Sintersearch thresholds respectively, if configured.
  • the UEs that apply “relaxed monitoring” may need to perform neighbour cell measurements on a relatively slow time scale, regardless if the UE considers itself to be stationary.
  • the slow time scale may be the same or different for different UEs.
  • the UE may apply for neighbour cell measurements “normal mobility requirements” or “relaxed monitoring requirements” .
  • Some embodiments may provide one or more of the following advantages.
  • Some embodiments may enable the load balancing among different CE levels.
  • Some embodiments may allow the offload from a congested CE level to another CE level. This may reduce the latency and/or improve resource utilization efficiency.
  • Some embodiments may address the fairness issue for stationary UEs always in apoor coverage location.
  • the ACB mechanism comprises a set of access classes. For example classes 0 to 9 are for regular users, class 10 is for emergency calls and classes 11 to 15 are for high priority or operator services.
  • embodiments may be used with any suitable standard. Some embodiments may be used with narrow band arrangement such as NB-LTE, LTE-M and NB-loT. However, these are by way of example only and the some embodiments may be used in any other suitable scenario. Some embodiments may be used with non-narrow band scenarios.
  • apparatuses may comprise or be coupled to other units or modules etc., such as radio parts or radio heads, used in or for transmission and/or reception.
  • apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the embodiments of this invention may be implemented by computer software executable by a data processor of the mobile device, suchas in the processor entity, or by hardware, or by a combination of software and hardware.
  • Computer software or program also called program product, including software routines, applets and/or macros, may be stored in any apparatus-readable data storage medium and they comprise program instructions to perform particular tasks.
  • a computer program product may comprise one or more computer-executable components which, when the program is run, are configured to carry out embodiments.
  • the one or more computer-executable components may be at least one software code or portions of it.
  • any blocks of the logic flow as in the Figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.
  • the physical media is a non-transitory media.
  • the memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may comprise one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) , application specific integrated circuits (ASIC) , FPGA, gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • Embodiments of the inventions may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé consistant à appliquer, au niveau d'un dispositif utilisateur, une politique d'accès d'interdiction d'accès à un niveau d'amélioration de couverture. La politique d'accès dépend d'un état associé audit dispositif utilisateur. Différentes politiques peuvent être appliquées en fonction du fait que le dispositif est mobile ou immobile.
PCT/CN2017/111324 2017-11-16 2017-11-16 Procédé et appareil de fourniture de contrôle d'accès WO2019095191A1 (fr)

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PCT/CN2017/111324 WO2019095191A1 (fr) 2017-11-16 2017-11-16 Procédé et appareil de fourniture de contrôle d'accès

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