WO2019138150A1 - Method, apparatus and computer program - Google Patents

Method, apparatus and computer program Download PDF

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Publication number
WO2019138150A1
WO2019138150A1 PCT/FI2018/050023 FI2018050023W WO2019138150A1 WO 2019138150 A1 WO2019138150 A1 WO 2019138150A1 FI 2018050023 W FI2018050023 W FI 2018050023W WO 2019138150 A1 WO2019138150 A1 WO 2019138150A1
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WO
WIPO (PCT)
Prior art keywords
bandwidth part
resource block
physical resource
block index
control
Prior art date
Application number
PCT/FI2018/050023
Other languages
French (fr)
Inventor
Karol Schober
Sami-Jukka Hakola
Jorma Kaikkonen
Original Assignee
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.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/FI2018/050023 priority Critical patent/WO2019138150A1/en
Publication of WO2019138150A1 publication Critical patent/WO2019138150A1/en

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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—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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 signaling, i.e. of overhead other than pilot signals

Definitions

  • the present application relates to a method, apparatus, system and computer program and in particular but not exclusively to the alignment of control resource sets (CORESETs) in new radio (NR).
  • CORESETs control resource sets
  • NR new radio
  • 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, communication of 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 (NR) networks.
  • NR is being standardized by the 3rd Generation Partnership Project
  • a method comprising receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the method may comprise receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the method may comprise receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • a method comprising providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the method may comprise providing the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the method may comprise providing an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • an apparatus comprising means for receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, means for determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and means for determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the apparatus may comprise means for receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the apparatus may comprise means for receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • an apparatus comprising means for providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the apparatus may comprise means for providing the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the apparatus may comprise means for providing an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • an apparatus 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 receive, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determine an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determine, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the apparatus may be configured to receive the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the apparatus may be configured to receive an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • an apparatus 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 provide, to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the apparatus may be configured to provide the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the apparatus may be configured to provide an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • a computer program embodied on a non-transitory computer-readable storage medium, the computer program comprising program code for controlling a process to execute a process, the process comprising, receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the process may comprise receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the process may comprise receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • a computer program embodied on a non-transitory computer-readable storage medium, the computer program comprising program code for controlling a process to execute a process, the process comprising, providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part.
  • the second bandwidth part may be a dedicated bandwidth part.
  • the first bandwidth part may be configured using a physical broadcast channel.
  • the first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be a remaining system information control resource set.
  • the process may comprise providing the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
  • the second bandwidth part may be configured using radio resource control signalling.
  • the process may comprise providing an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
  • the user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
  • a computer program product for a computer comprising software code portions for performing the steps the method of the first aspect when said product is run on the computer.
  • 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 schematic diagram for a dedicated CORESET and a RMSI CORESET on a NW carrier
  • Figure 5 shows a flowchart of a method according to an embodiment
  • Figure 6 shows a flowchart of a method according to an embodiment. Detailed description
  • a wireless communication system 100 such as that shown in figure 1
  • mobile communication devices or user equipment (UE) 102, 104, 105 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • 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 of a base station can be interconnected with other control entities.
  • the control apparatus is typically provided with memory capacity and at least one data processor.
  • the control apparatus and functions may be distributed between a plurality of control units. In some systems, the control apparatus may additionally or alternatively be provided in a radio network controller.
  • 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, 1 18 and 120 may also be connected to the network 1 13, for example by a separate gateway function and/or via the controllers of the macro level stations.
  • the base stations 1 16, 1 18 and 120 may be pico or femto level base stations or the like. In the example, stations 1 16 and 1 18 are connected via a gateway 1 1 1 whilst station 120 connects via the controller apparatus 108. In some embodiments, the smaller stations may not be provided. Smaller base stations 116, 1 18 and 120 may be part of a second network, for example WLAN and may be WLAN APs.
  • the communication devices 102, 104, 105 may access the communication system based on various access techniques, such as code division multiple access (CDMA), or wideband CDMA (WCDMA).
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • Other non-limiting examples comprise time division multiple access (TDMA), frequency division multiple access (FDMA) and various schemes thereof such as the interleaved frequency division multiple access (IFDMA), single carrier frequency division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA), space division multiple access (SDMA) and so on.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • IFDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • LTE-A LTE Advanced
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Base stations of such systems are known as evolved or enhanced Node Bs (eNBs) and provide E-UTRAN features such as user plane Packet Data Convergence/Radio Link Control/Medium Access Control/Physical layer protocol (PDCP/RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the communication devices.
  • E-UTRAN features such as user plane Packet Data Convergence/Radio Link Control/Medium Access Control/Physical layer protocol (PDCP/RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the communication devices.
  • RRC Radio Resource Control
  • Other examples of radio access system comprise those provided by base stations of systems that are based on technologies such as wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access).
  • WLAN wireless local area network
  • WiMax Worldwide Interoperability for Microwave Access
  • Network architecture in NR may be similar to that of LTE-advanced.
  • Base stations of NR systems may be known as next generation Node Bs (gNBs).
  • Changes to the network architecture may depend on the need to support various radio technologies and finer QoS support, and some on-demand requirements for e.g. QoS levels to support QoE of user point of view.
  • network aware services and applications, and service and application aware networks may bring changes to the architecture. Those are related to Information Centric Network (ICN) and User- Centric Content Delivery Network (UC-CDN) approaches.
  • ICN Information Centric Network
  • UC-CDN User- Centric Content Delivery Network
  • NR may use multiple input - multiple output (MIMO) antennas, many more base stations or nodes than the LTE (a so-called small cell concept), including macro sites operating in co-operation with smaller stations and perhaps also employing a variety of radio technologies for better coverage and enhanced data rates.
  • MIMO multiple input - multiple output
  • Future networks may utilise network functions virtualization (NFV) which is a network architecture concept that proposes virtualizing network node functions into“building blocks” or entities that may be operationally connected or linked together to provide services.
  • a virtualized network function (VNF) may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or data storage may also be utilized.
  • radio communications this may mean node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labour between core network operations and base station operations may differ from that of the LTE or even be non-existent.
  • a possible mobile 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’smart 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.
  • 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.
  • Non-limiting examples of these services comprise two-way or multiway 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 mobile 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.
  • the user may control the operation of the mobile 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 display 208, a speaker and a microphone can be also provided.
  • a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • the mobile 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 mobile device.
  • Figure 3 shows an example of a control apparatus for a communication system, for example to be coupled to and/orfor controlling a station of an access system, such as a RAN node, e.g. a base station, eNB or gNB, or a node of a core network such as an MME or S-GW, or a server or host.
  • the method may be implanted in a single control apparatus or across more than one control apparatus.
  • the control apparatus may be integrated with or external to a node or module of a core network or RAN.
  • base stations comprise a separate control apparatus unit or module.
  • the control apparatus can be another network element such as a radio network controller or a spectrum controller.
  • each base station may have such a control apparatus as well as a control apparatus being provided in a radio network controller.
  • the control apparatus 300 can be arranged to provide control on communications in the service area of the system.
  • the control 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.
  • a carrier bandwidth part is a contiguous set of physical resource blocks (PRB), selected from a contiguous subset of the common resource blocks for a given numerology(u) on a given carrier.
  • PRB physical resource blocks
  • all the grids are typically aligned with respect to a common PRB0 of the network carrier (i.e. the left edge of the BW). That is, the bandwidth parts are aligned with a common PRB grid.
  • the PRB grid may have a granularity, which may be denoted as N.
  • N may comprise 6 PRBs for CORESET configuration.
  • the CORESET sub-blocks start at PRBO+mN, where m at least 0.
  • the N may be equal to 1.
  • CORESET defines physical time and frequency resources on which physical downlink control channel (PDCCH) can be transmitted.
  • a UE may be configured to monitor PDCCH in one or multiple CORESETs.
  • CORESETs in NR may be at least one of a dedicated CORESET and a remaining system information (RMSI) CORESET.
  • RMSI refers to System Information Block #1 (SIB1 ).
  • SIB1 System Information Block #1
  • the RMSI CORESET may be configured by PBCH and contains Type0/0A/1 -PDCCH common search space.
  • the dedicated CORESET is CORESET configured for a given UE. In NR the dedicated CORESET may be configured with 6PRB granularity.
  • Dedicated CORESETs may be configured such that they are aligned within a control resource grid, e.g. a 6PRB grid starting at common PRB0. This would be similar to configuration of BWPs with respect to the PRB0 or setting the reference point of reference signal sequences to the PRB0, which enables scheduling of users operating using different bandwidth parts (BWP) on the same network carrier.
  • BWP bandwidth parts
  • DL bandwidth part BWP
  • RB indexing RB-offset indexing and RB-offset are used to configure the frequency-domain resource.
  • DL bandwidth part BWP
  • RB-offset resource block indexing
  • the control resource set of TypeO-PDCCH common search space herein referred as the Remaining Minimum System Information (RMSI) CORESET, may be configured by the Physical Broadcast Channel (PBCH).
  • PBCH Physical Broadcast Channel
  • the RMSI CORESET bandwidth defines the initial DL BWP and spans the entire initial BWP BW.
  • the initial BWP may be used by a UE for access to the network.
  • the UE may operate in Initial BWP also after the initial access.
  • Eight bits are used in the PBCH to define the RMSI CORESET location that carries TypeO- PDCCH common search-space together with the information regarding the synchronisation signal (SS)/PBCH block and RMSI (SIB1 ) numerology.
  • Four bits are used to provide an index to a table, an example of which is shown in Table 1 , which determines the number of consecutive resource blocks and a number of consecutive symbols for the control resource set (i.e. frequency and time allocation).
  • a further four bits is used to define physical downlink control channel (PDCCH) monitoring occasions of the TypeO-PDCCH common search-space.
  • PDCCH physical downlink control channel
  • RB indexing is for the initial DL BWP.
  • an offset for the RMSI CORESET in respect to the SS/PBCH block is provided.
  • the offset for the configurations of Table 1 are defined in Offset (RBs)” in the last column.
  • the offset is defined with respect to the subcarrier spacing of the RMSI CORESET and is the difference between the smallest RB index of the SS/PBCH block and the smallest RB index of RMSI CORESET carrying TypeO-PDCCH common search space. Due to restricted payload size in PBCH the range of the offsets may be limited. The range of offsets may cover a minimum range needed to ensure CORESET placement in the carrier BW.
  • the dedicated CORESET allocation in a BWP, is with 6 PRB granularity in 6 PRB frequency grid aligned with common PRB0 of the network carrier.
  • the RMSI CORESET allocation in the frequency domain (spanning the entire initial active DL BWP) is in PRB raster, and the starting PRB of initial active DL BWP cannot be always aligned with common 6PRB grid (with respect to common PRB0) because of the limited flexibility of the offset.
  • a misaligned CORESET structure may increase the blocking between control channel elements (CCEs) of RMSI CORESET which is always present in the carrier and dedicated CORESET which is configured on BWP other than initial BWP.
  • CCEs control channel elements
  • Figure 4 shows a schematic block diagram illustrating misalignment in the CORESET structure.
  • the dedicated CORESET is aligned in the 6PRB grid.
  • the RMSI CORESET can float anywhere in the PRB grid as a gNB may have limited flexibility to place the RMSI CORESET relative to the SS/PBCH block.
  • the misalignment of overlapping CORESETs is expressed by“Misalignment” in Figure 4, which is in this example is equal to 3PRB.
  • the alignment of the CORESETs in 6PRB grid, on initial BWP and dedicated BWP may be achieved implicitly given by two variables known by the UE: BWP' nit start and BWP ded start .
  • Figure 5 shows an example flowchart of a method according to an example.
  • the method comprises receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part.
  • the method comprises determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index for a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid of granularity N is aligned with the first physical resource block of the first bandwidth part.
  • Figure 6 shows an example flowchart of a method according to an example.
  • the method comprises providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
  • N may comprise one or more physical resource blocks.
  • N may comprise 6 physical resource blocks.
  • the first bandwidth part may be an initial bandwidth part and the second bandwidth part may be a dedicated bandwidth part.
  • the first physical resource block of a physical resource block grid of granularity N may be defined as PRB0.
  • the control resource set associated with the user equipment may be a dedicated CORESET.
  • the first resource block index for a control resource set associated with the user equipment may be referred to as the dedicated CORESET first PRB.
  • the index of the first PRB of a first bandwidth part is the index of the start PRB of the initial BWP and may be referred to as BWP init start .
  • BWP init start is known by all UEs for which the cell operates as Pcell, and is defined with respect to PRBO of a common resource block grid (e.g. the physical resource block grid of granularity N). BWP init start may be provided to the UE via PBCH.
  • the first bandwidth part may be defined by a second control resource set configured by a PBCH.
  • the first bandwidth part may be defined by the bandwidth of the second control resource set.
  • the second control resource set may be defined as an RMSI CORESET, i.e. the control resource set of TypeO-PDCCH common search space.
  • An index of the first PRB of the second bandwidth part is the start PRB of the dedicated BWP and may be referred to as BWP ded start .
  • BWP ded start is known by the UE, and is defined with respect to PRBO of the common resource block grid. BWP ded start may be provided to the UE using RRC signalling.
  • the offset, D, between a first physical resource block index of a first bandwidth part and a physical resource block grid of granularity N, may be determined using equation 1 .
  • the dedicated CORESET first PRB (in common PRB indexing) within the dedicated BWP may be determined using equation 2, wherein N is also the granularity of the CORESET configuration.
  • the common PRB indexing can be converted to PRB indexing of the BWP given BWP ded start- Dedicated CORESETs configured on BWPs in a Pcell and Scells (with the same common PRB0 as Pcell) are aligned in the 6PRB grid.
  • the 6PRB grid is aligned with the start of the starting PRB of the initial access BWP.
  • Having RMSI and dedicated CORESETs aligned in a PRB grid may improve the coexistence of the overlapping CORESETs. No additional configuration or other signalling may be needed.
  • the method may be implemented on a mobile device as described with respect to figure 2 or control apparatus as shown in Figure 3.
  • Control functions may comprise receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • control functions may comprise providing, to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and, in dependence on said offset and the first physical resource block index of said second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
  • 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. It is noted that whilst embodiments have been described in relation to NR architecture, similar principles can be applied in relation to other networks and communication systems where device-to-device communication and proximity services are available. Therefore, although certain embodiments were described above by way of example with reference to certain example architectures for wireless networks, technologies and standards, embodiments may be applied to any other suitable forms of communication systems than those illustrated and described herein.
  • 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, such as 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.

Abstract

There is provided a method comprising receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of said second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.

Description

Title
Method, apparatus and computer program Field
The present application relates to a method, apparatus, system and computer program and in particular but not exclusively to the alignment of control resource sets (CORESETs) in new radio (NR).
Background
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, communication of 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.
In a wireless communication system at least a part of a communication session between at least two stations occurs over a wireless link. Examples of wireless systems comprise public land mobile networks (PLMN), satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN). 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. 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. One example of a communications system is 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 (NR) networks. NR is being standardized by the 3rd Generation Partnership Project (3GPP).
Summary
In a first aspect there is provided a method comprising receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set. The method may comprise receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel. The second bandwidth part may be configured using radio resource control signalling.
The method may comprise receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a second aspect there is provided a method comprising providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The method may comprise providing the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
The second bandwidth part may be configured using radio resource control signalling. The method may comprise providing an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a third aspect there is provided an apparatus, said apparatus comprising means for receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, means for determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and means for determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The apparatus may comprise means for receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
The second bandwidth part may be configured using radio resource control signalling. The apparatus may comprise means for receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a fourth aspect there is provided an apparatus, said apparatus comprising means for providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The apparatus may comprise means for providing the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
The second bandwidth part may be configured using radio resource control signalling.
The apparatus may comprise means for providing an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling. The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a fifth aspect there is provided an apparatus 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 receive, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determine an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determine, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The apparatus may be configured to receive the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
The second bandwidth part may be configured using radio resource control signalling. The apparatus may be configured to receive an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a sixth aspect there is provided an apparatus 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 provide, to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The apparatus may be configured to provide the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
The second bandwidth part may be configured using radio resource control signalling. The apparatus may be configured to provide an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a seventh aspect, there is provided a computer program embodied on a non-transitory computer-readable storage medium, the computer program comprising program code for controlling a process to execute a process, the process comprising, receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The process may comprise receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel. The second bandwidth part may be configured using radio resource control signalling.
The process may comprise receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In an eighth aspect, there is provided a computer program embodied on a non-transitory computer-readable storage medium, the computer program comprising program code for controlling a process to execute a process, the process comprising, providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
N may comprise one or more physical resource blocks.
N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part. The second bandwidth part may be a dedicated bandwidth part.
The first bandwidth part may be configured using a physical broadcast channel.
The first bandwidth part may be defined by a second control resource set configured by the physical broadcast channel.
The first bandwidth part may be defined by the bandwidth of the second control resource set.
The second control resource set may be a remaining system information control resource set.
The process may comprise providing the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
The second bandwidth part may be configured using radio resource control signalling. The process may comprise providing an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
The user equipment may be associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
In a ninth aspect there is provided a computer program product for a computer, comprising software code portions for performing the steps the method of the first aspect when said product is run on the computer.
In the above, many different embodiments have been described. It should be appreciated that further embodiments may be provided by the combination of any two or more of the embodiments described above.
Description of Figures
Embodiments will now be described, by way of example only, with reference to the accompanying Figures in which:
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 schematic diagram for a dedicated CORESET and a RMSI CORESET on a NW carrier;
Figure 5 shows a flowchart of a method according to an embodiment;
Figure 6 shows a flowchart of a method according to an embodiment. Detailed description
Before explaining in detail the examples, certain general principles of a wireless communication system and mobile communication devices are briefly explained with reference to Figures 1 to 3 to assist in understanding the technology underlying the described examples.
In a wireless communication system 100, such as that shown in figure 1 , mobile communication devices or user equipment (UE) 102, 104, 105 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving node or point. 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. In Figure 1 control apparatus 108 and 109 are shown to control the respective macro level base stations 106 and 107. The control apparatus of a base station can be interconnected with other control entities. The control apparatus is typically provided with memory capacity and at least one data processor. The control apparatus and functions may be distributed between a plurality of control units. In some systems, the control apparatus may additionally or alternatively be provided in a radio network controller.
In Figure 1 base stations 106 and 107 are shown as connected to a wider communications network 113 via gateway 1 12. A further gateway function may be provided to connect to another network.
The smaller base stations 116, 1 18 and 120 may also be connected to the network 1 13, for example by a separate gateway function and/or via the controllers of the macro level stations. The base stations 1 16, 1 18 and 120 may be pico or femto level base stations or the like. In the example, stations 1 16 and 1 18 are connected via a gateway 1 1 1 whilst station 120 connects via the controller apparatus 108. In some embodiments, the smaller stations may not be provided. Smaller base stations 116, 1 18 and 120 may be part of a second network, for example WLAN and may be WLAN APs.
The communication devices 102, 104, 105 may access the communication system based on various access techniques, such as code division multiple access (CDMA), or wideband CDMA (WCDMA). Other non-limiting examples comprise time division multiple access (TDMA), frequency division multiple access (FDMA) and various schemes thereof such as the interleaved frequency division multiple access (IFDMA), single carrier frequency division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA), space division multiple access (SDMA) and so on.
An example of wireless communication systems are architectures standardized by the 3rd Generation Partnership Project (3GPP). A latest 3GPP based development is often referred to as the long term evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) radio-access technology. The various development stages of the 3GPP specifications are referred to as releases. More recent developments of the LTE are often referred to as LTE Advanced (LTE-A). The LTE employs a mobile architecture known as the Evolved Universal Terrestrial Radio Access Network (E-UTRAN). Base stations of such systems are known as evolved or enhanced Node Bs (eNBs) and provide E-UTRAN features such as user plane Packet Data Convergence/Radio Link Control/Medium Access Control/Physical layer protocol (PDCP/RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the communication devices. Other examples of radio access system comprise those provided by base stations of systems that are based on technologies such as 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.
An example of a suitable communications system is the 5G or NR concept. Network architecture in NR may be similar to that of LTE-advanced. Base stations of NR systems may be known as next generation Node Bs (gNBs). Changes to the network architecture may depend on the need to support various radio technologies and finer QoS support, and some on-demand requirements for e.g. QoS levels to support QoE of user point of view. Also network aware services and applications, and service and application aware networks may bring changes to the architecture. Those are related to Information Centric Network (ICN) and User- Centric Content Delivery Network (UC-CDN) approaches. NR may use multiple input - multiple output (MIMO) antennas, many more base stations or nodes than the LTE (a so-called small cell concept), including macro sites operating in co-operation with smaller stations and perhaps also employing a variety of radio technologies for better coverage and enhanced data rates.
Future networks may utilise network functions virtualization (NFV) which is a network architecture concept that proposes virtualizing network node functions into“building blocks” or entities that may be operationally connected or linked together to provide services. A virtualized network function (VNF) may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or data storage may also be utilized. In radio communications this may mean node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labour between core network operations and base station operations may differ from that of the LTE or even be non-existent.
A possible mobile 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. Such 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’smart 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. 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 multiway 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 mobile 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. The user may control the operation of the mobile 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 display 208, a speaker and a microphone can be also provided. Furthermore, a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
The mobile 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. In Figure 2 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 mobile device.
Figure 3 shows an example of a control apparatus for a communication system, for example to be coupled to and/orfor controlling a station of an access system, such as a RAN node, e.g. a base station, eNB or gNB, or a node of a core network such as an MME or S-GW, or a server or host. The method may be implanted in a single control apparatus or across more than one control apparatus. The control apparatus may be integrated with or external to a node or module of a core network or RAN. In some embodiments, base stations comprise a separate control apparatus unit or module. In other embodiments, the control apparatus can be another network element such as a radio network controller or a spectrum controller. In some embodiments, each base station may have such a control apparatus as well as a control apparatus being provided in a radio network controller. The control apparatus 300 can be arranged to provide control on communications in the service area of the system. The control 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.
In NR carrier bandwidth parts (BWP) are used. A carrier bandwidth part is a contiguous set of physical resource blocks (PRB), selected from a contiguous subset of the common resource blocks for a given numerology(u) on a given carrier. In NR, all the grids (precoding resource blog group (PRG), resource block group (RBG), numerologies) are typically aligned with respect to a common PRB0 of the network carrier (i.e. the left edge of the BW). That is, the bandwidth parts are aligned with a common PRB grid. The PRB grid may have a granularity, which may be denoted as N. For example in NR, N may comprise 6 PRBs for CORESET configuration. To be aligned, the CORESET sub-blocks start at PRBO+mN, where m at least 0. For BWP configuration, the N may be equal to 1.
CORESET defines physical time and frequency resources on which physical downlink control channel (PDCCH) can be transmitted. A UE may be configured to monitor PDCCH in one or multiple CORESETs. CORESETs in NR may be at least one of a dedicated CORESET and a remaining system information (RMSI) CORESET. In the context of NR, RMSI refers to System Information Block #1 (SIB1 ). The RMSI CORESET may be configured by PBCH and contains Type0/0A/1 -PDCCH common search space. The dedicated CORESET is CORESET configured for a given UE. In NR the dedicated CORESET may be configured with 6PRB granularity.
Dedicated CORESETs may be configured such that they are aligned within a control resource grid, e.g. a 6PRB grid starting at common PRB0. This would be similar to configuration of BWPs with respect to the PRB0 or setting the reference point of reference signal sequences to the PRB0, which enables scheduling of users operating using different bandwidth parts (BWP) on the same network carrier.
For a dedicated CORESET, which may be configured by UE-specific RRC signaling, downlink (DL) bandwidth part (BWP)-specific resource block (RB) indexing and RB-offset are used to configure the frequency-domain resource. To ensure all dedicated CORESETs on different BWPs, and even across UEs, are aligned in the 6PRB grid, the length of the bit-map is defined as
Floor((N_RB (ceil(BWP_start/6)*6-BWP_start))/6) The CORESET starting RB is ceil(BWP_start/6)*6
The control resource set of TypeO-PDCCH common search space, herein referred as the Remaining Minimum System Information (RMSI) CORESET, may be configured by the Physical Broadcast Channel (PBCH). The RMSI CORESET bandwidth defines the initial DL BWP and spans the entire initial BWP BW. The initial BWP may be used by a UE for access to the network. The UE may operate in Initial BWP also after the initial access.
Eight bits are used in the PBCH to define the RMSI CORESET location that carries TypeO- PDCCH common search-space together with the information regarding the synchronisation signal (SS)/PBCH block and RMSI (SIB1 ) numerology. Four bits are used to provide an index to a table, an example of which is shown in Table 1 , which determines the number of consecutive resource blocks and a number of consecutive symbols for the control resource set (i.e. frequency and time allocation). A further four bits is used to define physical downlink control channel (PDCCH) monitoring occasions of the TypeO-PDCCH common search-space.
Figure imgf000018_0001
Table 1
For a CORESET configured by PBCH, RB indexing is for the initial DL BWP.
As part of the frequency and time allocation, an offset for the RMSI CORESET in respect to the SS/PBCH block is provided. The offset for the configurations of Table 1 are defined in Offset (RBs)” in the last column. The offset is defined with respect to the subcarrier spacing of the RMSI CORESET and is the difference between the smallest RB index of the SS/PBCH block and the smallest RB index of RMSI CORESET carrying TypeO-PDCCH common search space. Due to restricted payload size in PBCH the range of the offsets may be limited. The range of offsets may cover a minimum range needed to ensure CORESET placement in the carrier BW.
That is, the dedicated CORESET allocation, in a BWP, is with 6 PRB granularity in 6 PRB frequency grid aligned with common PRB0 of the network carrier. The RMSI CORESET allocation in the frequency domain (spanning the entire initial active DL BWP) is in PRB raster, and the starting PRB of initial active DL BWP cannot be always aligned with common 6PRB grid (with respect to common PRB0) because of the limited flexibility of the offset.
Overlapping dedicated and RMSI CORESETs may not be aligned, resulting in misaligned CORESET structure. A misaligned CORESET structure may increase the blocking between control channel elements (CCEs) of RMSI CORESET which is always present in the carrier and dedicated CORESET which is configured on BWP other than initial BWP.
Figure 4 shows a schematic block diagram illustrating misalignment in the CORESET structure. The dedicated CORESET is aligned in the 6PRB grid. The RMSI CORESET can float anywhere in the PRB grid as a gNB may have limited flexibility to place the RMSI CORESET relative to the SS/PBCH block. The misalignment of overlapping CORESETs is expressed by“Misalignment” in Figure 4, which is in this example is equal to 3PRB. The alignment of the CORESETs in 6PRB grid, on initial BWP and dedicated BWP may be achieved implicitly given by two variables known by the UE: BWP'nit startand BWPded start.
Figure 5 shows an example flowchart of a method according to an example.
In a first step, S 1 , the method comprises receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part.
In a second step, S2, the method comprises determining, an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N (N=6 in the following example).
In a third step, S3, the method comprises determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index for a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid of granularity N is aligned with the first physical resource block of the first bandwidth part.
Figure 6 shows an example flowchart of a method according to an example.
In a first step, T 1 , the method comprises providing to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N and determining an offset between the first physical resource block index of the first bandwidth part and a first physical resource block of a physical resource block grid of granularity N.
N may comprise one or more physical resource blocks. For example, N may comprise 6 physical resource blocks.
The first bandwidth part may be an initial bandwidth part and the second bandwidth part may be a dedicated bandwidth part.
The first physical resource block of a physical resource block grid of granularity N may be defined as PRB0. The control resource set associated with the user equipment may be a dedicated CORESET.
The first resource block index for a control resource set associated with the user equipment may be referred to as the dedicated CORESET first PRB.
The index of the first PRB of a first bandwidth part is the index of the start PRB of the initial BWP and may be referred to as BWPinit start. BWPinit start is known by all UEs for which the cell operates as Pcell, and is defined with respect to PRBO of a common resource block grid (e.g. the physical resource block grid of granularity N). BWPinit start may be provided to the UE via PBCH.
The first bandwidth part may be defined by a second control resource set configured by a PBCH. The first bandwidth part may be defined by the bandwidth of the second control resource set. The second control resource set may be defined as an RMSI CORESET, i.e. the control resource set of TypeO-PDCCH common search space.
An index of the first PRB of the second bandwidth part is the start PRB of the dedicated BWP and may be referred to as BWPded start. BWPded start is known by the UE, and is defined with respect to PRBO of the common resource block grid. BWPded start may be provided to the UE using RRC signalling.
The offset, D, between a first physical resource block index of a first bandwidth part and a physical resource block grid of granularity N, may be determined using equation 1 .
Figure imgf000020_0001
The dedicated CORESET first PRB (in common PRB indexing) within the dedicated BWP may be determined using equation 2, wherein N is also the granularity of the CORESET configuration.
Figure imgf000020_0002
The common PRB indexing can be converted to PRB indexing of the BWP given BWPded start- Dedicated CORESETs configured on BWPs in a Pcell and Scells (with the same common PRB0 as Pcell) are aligned in the 6PRB grid. The 6PRB grid is aligned with the start of the starting PRB of the initial access BWP.
Having RMSI and dedicated CORESETs aligned in a PRB grid may improve the coexistence of the overlapping CORESETs. No additional configuration or other signalling may be needed.
It should be understood that each block of the flowcharts of Figure 5 and Figure 6 and any combination thereof may be implemented by various means or their combinations, such as hardware, software, firmware, one or more processors and/or circuitry.
The method may be implemented on a mobile device as described with respect to figure 2 or control apparatus as shown in Figure 3.
Control functions may comprise receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part, determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
Alternatively, or in addition, control functions may comprise providing, to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and, in dependence on said offset and the first physical resource block index of said second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
It should be understood that the 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. Although the apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities. It is noted that whilst embodiments have been described in relation to NR architecture, similar principles can be applied in relation to other networks and communication systems where device-to-device communication and proximity services are available. Therefore, although certain embodiments were described above by way of example with reference to certain example architectures for wireless networks, technologies and standards, embodiments may be applied to any other suitable forms of communication systems than those illustrated and described herein.
It is also noted herein that while the above describes example embodiments, there are several variations and modifications which may be made to the disclosed solution without departing from the scope of the present invention.
In general, 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, such as 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.
Further in this regard it should be noted that 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.
The foregoing description has provided by way of non-limiting examples a full and informative description of the exemplary embodiment of this invention. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the appended claims. However, all such and similar modifications of the teachings of this invention will still fall within the scope of this invention as defined in the appended claims. Indeed there is a further embodiment comprising a combination of one or more embodiments with any of the other embodiments previously discussed.

Claims

Claims
1. A method comprising:
receiving, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part;
determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N; and determining, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
2. A method according to claim 1 , wherein N comprises one or more physical resource blocks.
3. A method according to claim 2, wherein N comprises 6 physical resource blocks.
4. A method according to claims 1 to 3, wherein the first bandwidth part is an initial bandwidth part and the second bandwidth part is a dedicated bandwidth part.
5. A method according to claims 1 to 4, wherein the first bandwidth part is configured using a physical broadcast channel.
6. A method according to claims 5, wherein the first bandwidth part is defined by a second control resource set configured by the physical broadcast channel.
7. A method according to claim 6, wherein the first bandwidth part is defined by the bandwidth of the second control resource set.
8. A method according to claim 6 or claim 7, wherein the second control resource set is a remaining system information control resource set.
9. A method according to claims 1 to 8, comprising receiving the indication of the first physical resource block index of the first bandwidth part using the physical broadcast channel.
10. A method according to claims 1 to 9, wherein the second bandwidth part is configured using radio resource control signalling.
1 1. A method according to claim 10, comprising receiving an indication of the first physical resource block index of the second bandwidth part via radio resource control signalling.
12. A method according to claims 1 to 1 1 , wherein the user equipment is associated with a primary cell, or a secondary cell having a common physical resource block grid of granularity N with the primary cell.
13. A method comprising:
providing, to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and, in dependence on said offset and the first physical resource block index of said second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
14. An apparatus comprising means for performing a method according to any one of claims 1 to 12 or claim 13.
15. A computer program product for a computer, comprising software code portions for performing the steps of any of claims 1 to 12 or claim 13 when said product is run on the computer.
16. An apparatus 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: receive, at a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part;
determine an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N; and
determine, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
17. An apparatus 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:
provide, to a user equipment, an indication of a first physical resource block index of a first bandwidth part and an indication of a first physical resource block index of a second bandwidth part for use in determining an offset between the first physical resource block index of the first bandwidth part and a physical resource block grid of granularity N and, in dependence on said offset and the first physical resource block index of the second bandwidth part, a first resource block index of a control resource set associated with the user equipment, the control resource set aligned with a control resource set grid of granularity N, such that the control resource set grid is aligned with the first physical resource block index of the first bandwidth part.
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