WO2017089405A1 - Informations de système segmentées dans un système de communication sans fil - Google Patents

Informations de système segmentées dans un système de communication sans fil Download PDF

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Publication number
WO2017089405A1
WO2017089405A1 PCT/EP2016/078565 EP2016078565W WO2017089405A1 WO 2017089405 A1 WO2017089405 A1 WO 2017089405A1 EP 2016078565 W EP2016078565 W EP 2016078565W WO 2017089405 A1 WO2017089405 A1 WO 2017089405A1
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Prior art keywords
information
transmission
transmissions
information related
information elements
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PCT/EP2016/078565
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English (en)
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Claudio Rosa
Frank Frederiksen
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Nokia Solutions And Networks Oy
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection

Definitions

  • the present invention relates to the field of wireless communications. More specifically, the present invention relates to methods, apparatus, systems and computer programs for providing system information in particular in systems operated in unlicensed/license exempt spectrum.
  • 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, 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.
  • a 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).
  • 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 is often referred to as user equipment (UE).
  • 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.
  • LTE long-term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • LTE Rel-1 1 LTE Rel-1 1
  • LTE Rel-12 LTE Rel-13
  • LTE-A LTE-Advanced
  • Communication systems may be configured to use a mechanism for aggregating radio carriers to support wider transmission bandwidth.
  • CA carrier aggregation
  • a communication device with reception and/or transmission capabilities for CA can simultaneously receive and/or transmit on multiple component carriers (CCs) corresponding to multiple serving cells, for which the
  • the communication device has acquired/monitors system information needed for initiating connection establishment.
  • CA radio resource control
  • the communication device has only one radio resource control (RRC) connection with the network.
  • RRC radio resource control
  • one serving cell provides the non-access stratum (NAS) mobility information, such as tracking area identity information.
  • NAS non-access stratum
  • NAS non-access stratum
  • SCells secondary serving cells
  • SCells can be configured to form together with the PCell a set of serving cells under CA.
  • the carrier corresponding to the PCell is the downlink primary component carrier (DL PCC), while in the uplink it is the uplink primary component carrier (UL PCC).
  • DL PCC downlink primary component carrier
  • U PCC uplink primary component carrier
  • a SCell needs to be configured by the network using RRC signaling before usage in order to provide necessary information, such as DL radio carrier frequency and physical cell identity (PCI) information, to the communication device.
  • a SCell for which such necessary information has been provided to a communication device is referred to as configured cell for this communication device.
  • the information available at the communication device after cell configuration is in particular sufficient for carrying out cell measurements.
  • a configured SCell is in a deactivated state after cell configuration for energy saving. When a SCell is deactivated, the communication device does in particular not monitor/receive the physical dedicated control channel (PDCCH) or physical downlink shared channel (PDSCH) in the SCell.
  • PDCH physical dedicated control channel
  • PDSCH physical downlink shared channel
  • LTE provides for a mechanism for activation and deactivation of SCells via media access control (MAC) control elements to the communication device.
  • Communication systems may be configured to support simultaneous communication with two or more access nodes. In LTE this mechanism is referred to as dual connectivity (DC).
  • a communication device may be configured in LTE to communicate with a master eNB (MeNB) and a secondary eNB (SeNB).
  • MeNB master eNB
  • SeNB secondary eNB
  • the MeNB may typically provide access to a macrocell
  • the SeNB may provide on a different radio carrier access to a relatively small cell, such as a picocell.
  • LTE supports two different user plane architectures for communication devices in DC mode.
  • the MeNB In the first architecture (split bearer) only the MeNB is connected via an S1 -U interface to the serving gateway (S-GW) and the user plane data is transferred from the MeNB to the SeNB via an X2 interface.
  • the SeNB In the second architecture the SeNB is directly connected to the S-GW, and the MeNB is not involved in the transport of user plane data to the SeNB.
  • DC in LTE reuses with respect to the radio interface concepts introduced for CA in LTE.
  • a first group of cells can be provided for a communication device by the MeNB and may comprise one PCell and one or more SCells
  • a second group of cells referred to as seconday cell group (SCG)
  • SCG seconday cell group
  • PSCell primary SCell
  • This second group of cells may further comprise one or more SCells.
  • Future networks may progressively integrate data transmissions of different radio technologies in a communication between one or more access nodes and a communication device. Accordingly, communication devices may be able to operate simultaneously on more than one radio access technology, and carrier aggregation and dual connectivity may not be limited to the use of radio carriers of only one radio access technology. Rather, aggregation of radio carriers according to different radio access technologies and concurrent communication on such aggregated carriers may be supported. Small cells, such as picocells, may progressively be deployed in future radio access networks to match the increasing demand for system capacity due to the growing population of communication devices and data applications. Integration of radio access technologies and/or a high number of small cells may bring about that a communication device may detect more and more cells in future networks which are suitable candidates for connection establishment.
  • Enhancements of carrier aggregation and dual connectivity mechanisms may be needed to make best use of these cells in future radio access networks.
  • Such enhancements may allow for an aggregation of a high number of radio carriers at a communication device, for example up to 32 are currently specified in LTE Rel. 13, and in particular an integration of radio carriers operated on unlicensed spectrum.
  • Wireless communication systems may be licensed to operate in particular spectrum bands.
  • a technology for example LTE, may operate, in addition to a licensed band, in an unlicensed band.
  • LTE operation in the unlicensed spectrum may be based on the LTE Carrier Aggregation (CA) framework where one or more low power secondary cells (SCells) operate in the unlicensed spectrum and may be either downlink-only or contain both uplink (UL) and downlink (DL), and where the primary cell
  • CA LTE Carrier Aggregation
  • PCell operates in the licensed spectrum and can be either LTE Frequency Division Duplex (FDD) or LTE Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • LTE-LAA LTE Licensed-Assisted Access
  • LTE-U LTE in Unlicensed Spectrum
  • LTE-LAA specified in 3GPP as part of Rel. 13
  • LTE-U LTE-U as defined by the LTE-U Forum
  • the licensed and unlicensed bands may be operated together using, e.g. , carrier aggregation or dual connectivity.
  • carrier aggregation between a primary cell (PCell) on a licensed band and one or more secondary cells (SCells) on unlicensed band may be applied, and uplink control information of the SCells is communicated in the PCell on licensed spectrum.
  • PCell primary cell
  • SCells secondary cells
  • stand-alone operation using unlicensed carrier only may be used.
  • standalone operation at least some of the functions for access to cells on unlicensed spectrum and data transmission in these cells are performed without or with only minimum assistance or signaling support from license-based spectrum.
  • Dual connectivity operation for unlicensed bands can be seen as an example of the scenario with minimum assistance or signaling from license-based spectrum.
  • Unlicensed band technologies may need to abide by certain rules, e.g. a clear channel assessment procedure, such as Listen-Before-Talk (LBT), in order to provide fair coexistence between LTE and other technologies such as Wi-Fi as well as between LTE operators.
  • LBT Listen-Before-Talk
  • respective rules may be specified in regulations.
  • a user or an access point may, depending on rules or regulatory requirements, need to perform a Clear Channel Assessment (CCA) procedure, such a Listen-Before-Talk (LBT).
  • CCA Clear Channel Assessment
  • LBT Listen-Before-Talk
  • the user or access node may, for example, monitor a given radio frequency, i.e. carrier, for a short period of time to ensure that the spectrum is not already occupied by some other transmission.
  • the requirements for CCA procedures, such as LBT vary depending on the geographic region: e.g. in the US such requirements do not exist, whereas in e.g. Europe and Japan the network elements operating on unlicensed bands need to comply with LBT requirements.
  • CCA procedures such as LBT
  • LBT long term evolution
  • DL downlink
  • UL uplink
  • An uplink transmission may not be subject to a CCA procedure, such as LBT, if the time between a DL transmission and a subsequent UL transmission is less than or equal to a predetermined value.
  • certain signaling rules such as Short Control Signaling (SCS) rules defined for Europe by ETSI, may allow for the transmission of control or management information without LBT operation, if the duty cycle of the related signaling does not exceed a certain threshold, e.g. 5%, within a specified period of time, for example 50 ms.
  • SCS Short Control Signaling
  • the aforementioned SCS rules for example, can be used by compliant communication devices, referred to as operating in adaptive mode for respective SCS transmission of management and control frames without sensing the channel for the presence of other signals.
  • adaptive mode is defined in ETSI as a mechanism by which equipment can adapt to its environment by identifying other transmissions present in a band, and addresses a general requirement for efficient operation of communications systems on unlicensed bands.
  • scheduled UL transmissions may in general be allowed without LBT, if the time between a DL transmission from an access node and a subsequent UL transmission is less than or equal to a predetermined value, and the access node has performed a clear channel assessment procedure, such as LBT, prior to the DL transmission.
  • the total transmission time covering both DL transmission and subsequent UL transmission may be limited to a maximum burst or channel occupancy time.
  • the maximum burst or occupancy time may be specified, for example, by a regulator.
  • a respective time window may comprise one or more transmission time intervals (TTI), such as subframes in LTE, and is in the following referred to as uplink transmission opportunity or downlink transmission opportunity.
  • TTI transmission time intervals
  • a TTI is the time period reserved in a scheduling algorithm for performing a data transmission of a dedicated data unit in the communication system.
  • the determination may further be based on rules or regulations specifying a minimum and/or maximum allowed length of uplink transmissions and/or downlink transmissions.
  • the determination of uplink and downlink opportunities may in particular be based on the outcome of a clear channel assessment procedure, and communication devices or access nodes will only start data transmission on a frequency band after having assessed that the frequency band is clear, that is, not occupied by data transmissions from other communication devices or access nodes. Further rules or regulations may govern data transmissions in a communication between an access node and one or more communication devices.
  • These rules may, for example, specify a maximum length of a time window in the communication covering at least one transmission in a first direction, for example in DL in a cellular system from an access node of a cell, and at least one subsequent transmission in the reverse direction, for example in UL from one or more communication devices in the cell.
  • a time window comprising one or more DL and UL transmissions is in the following referred to as communication opportunity.
  • DL transmissions may comprise scheduling information which may be transmitted on a DL control channel. The scheduling information may in particular be used for scheduling one or more UL data transmissions and/or one or more DL data transmissions within the current one or more future communication opportunities.
  • Scheduling information for a data transmission is indicative of an assignment of contents attributes, format attributes and mapping attributes to the data transmission.
  • Mapping attributes relate to one or more channel elements allocated to the transmission on the physical layer. Specifics of the channel elements depend on the radio access technology and may depend on the used channel type.
  • a channel element may relate to a group of resource elements, while each resource element relates to a frequency attribute, for example a subcarrier index (and the respective frequency range) in a system employing orthogonal frequency-division multiplexing (OFDM), and a time attribute, such as the transmission time of an OFDM or Single-Carrier FDMA symbol.
  • OFDM orthogonal frequency-division multiplexing
  • a channel element may further relate to a code attribute, such as a cover code or a spreading code, which may allow for parallel data transmission on the same set of resource elements.
  • a code attribute such as a cover code or a spreading code
  • Illustrative examples for channel elements in LTE are control channel elements (CCE) on the physical downlink control channel (PDCCH) or the enhanced physical downlink control channel (EPDCCH), PUCCH resources on the physical uplink control channel (PUCCH), and physical resource blocks (PRB) on the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH).
  • CCE control channel elements
  • PUCCH physical downlink control channel
  • PUCCH physical uplink control channel
  • PRB physical resource blocks
  • PDSCH physical downlink shared channel
  • Format attributes relate to the processing of a set of information bits in the transmission prior to the mapping to the allocated channel elements.
  • Format attributes may in particular comprise a modulation and coding scheme used in the transmission and the length of the transport block in the transmission.
  • Contents attributes relate to the user/payload information conveyed through the transmission.
  • a contents attribute is any information which may in an application finally affect the arrangement of a detected data sequence at the receiving end.
  • Contents attributes may comprise the sender and/or the receiver of the transmission.
  • Contents attributes may further relate to the information bits processed in the transmission, for example some kind of sequence number in a communication. Contents attributes may in particular indicate whether the transmission is a retransmission or relates to a new set of information bits. In case of a hybrid automatic repeat request (HARQ) scheme contents attributes may in particular comprise an indication of the HARQ process number, that is, a HARQ-specific sequence number, the redundancy version (RV) used in the transmission and a new data indicator (NDI).
  • HARQ hybrid automatic repeat request
  • Scheduling information for a data transmission need not comprise assignment information for the complete set of attributes needed in the data transmission. At least a part of the attributes can be preconfigured, for example through semi-persistent scheduling, and can be used in more than one data transmission. Some of the attributes may be signaled implicitly or may be derivable, for example from timing information.
  • dynamic scheduling in a more complex system such as a cellular mobile network, requires transmission of scheduling information on a DL control channel.
  • the DL scheduling information related to a certain data transmission may be transmitted on a component carrier other than the data transmission. Transmission of a data and scheduling information on different component carriers is referred to as cross-carrier scheduling.
  • Scheduling information may be included in downlink control information (DCI).
  • DCI downlink control information
  • Downlink control information (DCI) may be transmitted on a downlink control channel, such as the physical downlink control channel (PDCCH) or the enhanced physical downlink control channel (EPDCCH) in LTE.
  • Scheduling information may be destined to individual communication devices, groups of communication devices or all communication devices in a cell.
  • the downlink control information may comprise respective identity information of the addressed communication devices.
  • This identity information may be included in the encoding of the downlink control information for error detection, for example by including the identity information in a cyclic redundancy check (CRC) calculation.
  • a device-specific identifier such as the cell radio network temporary identifier (C-RNTI) in LTE, may be used for normal unicast data transmission to a certain communication device.
  • Specific identifiers such as the system information RNTI (Sl- RNTI) and the paging RNTI (P-RNTI) may be configured for notifying communication devices in a cell of non-unicast data transmissions and data transmissions prior to the assignment of a device-specific identifier in a cell.
  • a communication device may start monitoring channel elements related to a DL control channel carrying scheduling information after detection of a DL data burst in the cell.
  • the detection of the DL data burst may be based on the detection of a certain signal in the cell, for example a reference signal, such as a cell reference signal which the communication device may blindly detect, or based on explicit signaling indicative of the presence of the DL data burst.
  • Monitoring channel elements related to a DL control channel may comprise blind detection of scheduling information destined to the communication device.
  • the control channel may be a physical downlink control channel (PDCCH) or enhanced physical downlink control channel (EPDCCH) as specified in LTE or a similar channel.
  • PDCH physical downlink control channel
  • EPDCCH enhanced physical downlink control channel
  • the communication device may further detect a DL data transmission on a data channel, such as a physical downlink shared channel (PDSCH) or a similar channel, based on the detected scheduling information.
  • a communication system may employ a retransmission mechanism, such as Automatic Repeat Request (ARQ), for handling transmission errors.
  • a receiver in such a system may use an error-detection code, such as a Cyclic Redundancy Check (CRC), to verify whether a data packet was received in error.
  • CRC Cyclic Redundancy Check
  • the receiver may notify the transmitter on a feedback channel of the outcome of the verification by sending an acknowledgement (ACK) if the data packet was correctly received or a non-acknowledgement (NACK) if an error was detected.
  • the transmitter may subsequently transmit a new data packet related to other information bits, in case of an ACK, or retransmit the data packet received in error, in case of a NACK.
  • the retransmission mechanism may be combined with forward error-correction coding
  • FEC redundancy information
  • HARQ hybrid automatic repeat request
  • retransmissions may contain identical copies of the first transmission.
  • the various transmissions related to the same information bits may comprise different redundancy versions (RV), and each retransmission makes additional redundancy information available at the receiver for data detection.
  • the number of transmissions related to the same information bits may be limited in a communication system by a maximum number of not successful transmissions, and a data packet related to new information bits may be transmitted once the maximum number of not successful transmissions has been reached.
  • a scheduling grant may comprise a new data indicator (NDI) notifying a communication device whether the scheduled transmission is destined for a data packet related to new information bits.
  • NDI new data indicator
  • the scheduling grant may comprise an indication of the redundancy version (RV) used or to be used in the transmission.
  • RV redundancy version
  • Each data packet often referred to as transport block, may be transmitted in a communication system within a transmission time interval (TTI), such as a subframe in LTE.
  • TTI transmission time interval
  • At least two transport blocks may be transmitted in parallel in a TTI when spatial multiplexing is employed.
  • Processing of a transport block, its transmission and the processing and transmission of the corresponding HARQ-ACK feedback may take several TTIs. For example, in LTE-FDD such a complete HARQ loop takes eight subframes.
  • HARQ processes are needed in a data stream in LTE-FDD for continuous transmission between an access node and a communication device.
  • the HARQ processes are handled in the access nodes and the communication devices in parallel, and each HARQ process controls the transmission of transport blocks and ACK/NACK feedback related to a set of information bits in the data stream.
  • An essential parameter a communication device needs for acquiring basic configuration information of a system and for measurement reporting of neighbouring cell is the respective system timing.
  • a communication device determines the system timing during the cell search procedure.
  • the network may assist the cell search by transmitting one or more
  • the one or more synchronization signals in a cell such as the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) in LTE.
  • the one or more synchronization signals may be transmitted on predetermined channel resources at predetermined offsets from the start of basically equivalent system time intervals, such as the radio frames in LTE.
  • a communication device may determine the starts of system time intervals in the cell from the known offsets once it has detected the one or more synchronizations signals in the cell.
  • the one or more synchronization signals may provide the communication device with further information on the cell.
  • the further information may be conveyed through different sequences or different combinations of sequences of the one or more
  • the physical cell identifier (PCID) of a cell is signalled using respective PSS and SSS sequences. Information on the cell may also be conveyed through relative offsets between the one or more synchronization signals.
  • different relative offsets between PSS and SSS are indicative of the duplexing mode, frequency division duplex (FDD) or time division duplex (TDD), used in the cell, and the cyclic prefix length used in the cell.
  • FDD frequency division duplex
  • TDD time division duplex
  • a communication device needs to know basic configuration information of the system. This basic configuration information is in the following referred to as system information. System information may therefore be broadcast repeatedly from access points of a wireless communication system.
  • the time period between two broadcasts of the same information element may depend on the relevance of the conveyed information for a communication device entering a cell.
  • System information elements may therefore be grouped into system information blocks (SIB) in dependence on the relevance of the conveyed information.
  • SIB system information blocks
  • One system information block may provide an initial set of system information elements.
  • This system information block is in the following referred to a as master information block (MIB).
  • MIB master information block
  • the master information block (MIB) may comprise parameters needed for initial access of a communication device to the system.
  • Information elements of an exemplary MIB are presented in the following with reference to the information elements in LTE.
  • the MIB in LTE includes
  • PHICH physical hybrid ARQ indicator channel
  • SFN system frame number
  • the communication device may need to receive the master information block (MIB) before it can start reading/detecting further system information.
  • the master information block (MIB) may therefore be transmitted on a dedicated broadcast channel, such as the physical broadcast channel (PBCH) in LTE.
  • PBCH physical broadcast channel
  • This dedicated broadcast channel may be transmitted on predetermined channel/resource elements, so as to allow for detection of the master information block (MIB) by a
  • the PBCH in LTE is mapped in each radio frame (system frame) to the central 72 subcarriers of the first four OFDM symbols in the second slot of the first subframe. Accordingly, the PBCH is transmitted in LTE every 10 ms.
  • the master information block on the PBCH is updated in LTE every 40 ms and each repetition within this update period contains an individually decodable version of the master information block (MIB).
  • MIB master information block
  • the communication device may further discover the number of transmit antenna ports in a cell from the dedicated broadcast channel, for example by determining respective arrangements of signals in space-frequency blocks on the channel and/or by determining a sequence used in the cell for scrambling cyclic redundancy check bits according to the number of cell-specific reference signal ports.
  • Further system information related to other system information blocks (SIBs) may be transmitted on a shared downlink channel, such as the physical downlink shared channel (PDSCH) in LTE.
  • PDSCH physical downlink shared channel
  • DCI Downlink control information
  • the downlink control information (DCI) may be transmitted on a downlink control channel, such as the physical downlink control channel (PDCCH) in LTE.
  • the downlink control information may be marked on the downlink control channel with a specific identifier, such as the system information radio network temporary identifier (SI-RNTI) in LTE.
  • SI-RNTI system information radio network temporary identifier
  • system information elements may be grouped in dependence on the relevance of the information provided therein. An exemplary grouping is presented in the following with reference to some system information block types in LTE:
  • a first system information block type such as SIB1 in LTE, may provide scheduling information on the transmission of further system information blocks (SIB2 and beyond in LTE).
  • the first system information block type may include information on at least one operator of the cell. It may further comprise access restrictions with regard to different groups of communication devices.
  • the first system information block type may further comprise information indicative of the allocation of transmission time intervals in uplink or downlink in a communication opportunity, such as the uplink- downlink configuration in LTE-TDD.
  • a second system information block type such as SIB 2 in LTE, may include
  • the second information block type may further include random access parameters and uplink power control parameters.
  • a third system information block type such as SIB3 in LTE, may include information related to intra-frequency cell (re)selection.
  • Further system block types may include system information related to neighbouring cells, public warning messages, commercial alerting system information etc.
  • the various system information block types may be broadcast at regular time intervals, ranging in LTE, for example, from 80 ms to approximately 5 seconds. These time intervals may be configurable in a cell, and a respective schedule may be included in a special system information block type, such as SIB1 in LTE.
  • the time period between two transmissions of said special system information block type may be preconfigured or may be specified in a standard, for example by specifying a number of system time intervals, such as the radio frames in LTE, between two transmissions. Accordingly, the communication may need to know a numbering of the system time intervals, such as the system frame number (SFN) in LTE, for determining when certain system information is broadcast in a cell.
  • SIB1 is broadcast with an update period of eight radio frames (80 ms) and repeated in the 5 th subframe of every radio frame with even system frame number (SFN).
  • An indication of a system time interval numbering such as the SFN in LTE, may be broadcast in a system on a dedicated broadcast channel in a master information block.
  • An update period may be specified for the dedicated broadcast channel which may include several repetitions, so as to ensure a reliable decoding of the data block carried on the dedicated broadcast channel.
  • a data block carried on PBCH in LTE is transmitted once per radio frame (every 10 ms) and is only updated every four radio frames (every 40 ms). Repeated transmission of a data block on the dedicated broadcast channel facilitates averaging/combining of received samples at a communication device.
  • the system time interval number in the master information block of a repetition cannot indicate the number of the current system time interval if the first transmission and the repetition occur in different system time intervals.
  • the MIB in LTE does not include the two least significant bits of the SFN, and a communication device may need to decode/combine the PBCH at different timing positions for determining the position of the 40 ms update period of the MIB from which it can infer the two least significant bits of the SFN.
  • the following relates to system information acquisition by a communication device in a system operated on unlicensed (license exempt) spectrum.
  • CCA clear channel assessment
  • LBT listen-before-talk
  • system information may be transmitted using a robust modulation and coding scheme ensuring successful decoding after only one transmission by most of the communication devices in a cell.
  • Transmitting a larger set of system information elements using a safe modulation and coding scheme may lead to relatively big transport blocks in systems operated on unlicensed spectrum.
  • the included system information may comprise elements, the size of which depends on the current network configuration, such as the SIB-Mappinglnfo and the PLMN- IdentityList in SIB 1 specified in LTE.
  • the capacity available for transmission of system information may vary with the data load on the shared data channel used for transmission of system information.
  • a method comprising, receiving in a first transmission time interval of a wireless communication system a first transmission comprising information related to one or more information elements of a set of information elements providing system information. The method further comprises determining whether the first
  • transmission is associated with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements, and further receiving information related to the at least one of the one or more information elements in at least one of the one or more second transmissions, if the determining is affirmative.
  • the method may further comprise, receiving complete information related to the at least one of the one or more information elements in the first transmission, if the determining is not affirmative.
  • the extension information may comprise at least one of:
  • the method may further comprise, evaluating a time offset configuration related to the time between the first transmission and the at least one of the one or more second transmissions.
  • the time offset configuration may be predetermined.
  • the time information in the extension information may be indicative of the time offset configuration.
  • the time offset configuration may comprise information indicative of a search window related to the at least one of the one or more second transmissions.
  • the first transmission and the at least one of the one or more second transmissions may occur in the same downlink transmission opportunity.
  • the at least one of the one or more second transmissions may occur in the transmission time interval following the first transmission time interval.
  • the first transmission time interval and the one or more second transmission time intervals may be subframes as specified for an evolved universal terrestrial radio access network.
  • the time offset configuration may comprise at least one of:
  • the identifier information in the extension information may be indicative of a cell radio network temporary identifier as specified for an evolved universal terrestrial radio access network.
  • the information related to the at least one of the one or more information elements may comprise partial or complete information related to the at least one of the one or more information elements.
  • the first transmission may comprise no or only partial information related to the at least one of the one or more information elements.
  • the first transmission may comprise at least a part of the extension information.
  • An extension indication identifier used on a downlink control channel may notify one or more communication devices of the association between the first transmission and the extension information.
  • the first transmission may comprise a discovery reference signal.
  • the time offset configuration may be based on a discovery measurement timing
  • the first transmission and the at least one of the one or more second transmissions may be subject to execution of a clear channel assessment procedure.
  • a method comprising preparing for a first transmission time interval a first transmission comprising information related to one or more information elements of a set of information elements providing system information. The method further comprises determining whether the first transmission needs association with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements, and further causing transmission of information related to the at least one of the one or more information elements in at least one of the one or more second transmissions, if the determining is affirmative.
  • the method may further comprise, causing transmission of complete information related to the at least one of the one or more information elements in the first transmission, if the determining is not affirmative.
  • the extension information may comprise at least one of:
  • the method may further comprise, providing a time offset configuration related to the time between the first transmission and the at least one of the one or more second transmissions.
  • the time offset configuration may be predetermined.
  • the time information in the extension information may be indicative of the time offset configuration.
  • the time offset configuration may comprise information indicative of a search window related to the at least one of the one or more second transmissions.
  • the first transmission and the at least one of the one or more second transmissions may occur in the same downlink transmission opportunity.
  • the at least one of the one or more second transmissions may occur in the transmission time interval following the first transmission time interval.
  • the first transmission time interval and the one or more second transmission time intervals may be subframes as specified for an evolved universal terrestrial radio access network.
  • the time offset configuration may comprise at least one of:
  • the identifier information in the extension information may be indicative of a cell radio network temporary identifier as specified for an evolved universal terrestrial radio access network.
  • the information related to the at least one of the one or more information elements may comprise partial or complete information related to the at least one of the one or more information elements.
  • the first transmission may comprise no or only partial information related to the at least one of the one or more information elements.
  • the first transmission may comprise at least a part of the extension information.
  • An extension indication identifier used on a downlink control channel may notify one or more communication devices of the association between the first transmission and the extension information.
  • the first transmission may comprise a discovery reference signal.
  • the time offset configuration may be based on a discovery measurement timing configuration as specified for an evolved universal terrestrial radio access network.
  • the first transmission and the at least one of the one or more second transmissions may be subject to execution of a clear channel assessment procedure.
  • an apparatus comprising at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus at least to receive in a first transmission time interval of a wireless communication system a first transmission comprising information related to one or more information elements of a set of information elements providing system information.
  • the at least one memory and the computer program code further configured, with the at least one processor, to cause the apparatus at least to determine whether the first transmission is associated with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements, and further to receive information related to the at least one of the one or more information elements in at least one of the one or more second transmissions, if the determining is affirmative.
  • the at least one memory and the computer program code may further be configured, with the at least one processor, to cause the apparatus at least to perform a method according to embodiments of the first aspect.
  • an apparatus comprising at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus at least to prepare for a first transmission time interval a first transmission comprising information related to one or more information elements of a set of information elements providing system information, and to determine whether the first transmission needs association with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements, and further to cause transmission of information related to the at least one of the one or more information elements in at least one of the one or more second transmissions, if the determining is affirmative.
  • the at least one memory and the computer program code may further be configured, with the at least one processor, to cause the apparatus at least to perform a method according to embodiments of the second aspect.
  • an apparatus comprising means for performing a method according to embodiments of the first aspect.
  • an apparatus comprising means for performing a method according to embodiments of the second aspect.
  • 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 in a first transmission time interval of a wireless communication system a first transmission comprising information related to one or more information elements of a set of information elements providing system information.
  • the process further comprising determining whether the first transmission is associated with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements, and further receiving information related to the at least one of the one or more information elements in at least one of the one or more second transmissions, if the determining is affirmative.
  • 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 preparing for a first transmission time interval a first transmission comprising information related to one or more information elements of a set of information elements providing system information.
  • the process further comprising determining whether the first transmission needs association with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements, and further causing transmission of information related to the at least one of the one or more information elements in at least one of the one or more second transmissions, if the determining is affirmative.
  • a computer program product for a computer comprising software code portions for performing the steps of a method according to embodiments of the first aspect.
  • a computer program product for a computer comprising software code portions for performing the steps of a method according to embodiments of the second aspect.
  • a mobile communication system comprising at least one apparatus according to the third aspect and at least one apparatus according to the forth aspect.
  • a mobile communication system comprising at least one apparatus according to the fifth aspect and at least one apparatus according to the sixth aspect.
  • 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 an example method of a mobile communication device supporting transmission of segmented system information
  • Figure 4 shows an example method of an access node supporting transmission of segmented system
  • Figure 5 shows a signaling diagram illustrating segmentation and transmission of system information.
  • Figure 6 shows a schematic diagram of an example control apparatus
  • 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.
  • the control apparatus may additionally or alternatively be provided in a radio network controller.
  • LTE systems may however be considered to have a so-called "flat" architecture, without the provision of RNCs; rather the (e)NB is in communication with a system architecture evolution gateway (SAE-GW) and a mobility management entity (MME), which entities may also be pooled meaning that a plurality of these nodes may serve a plurality (set) of (e)NBs.
  • SAE-GW is a "high-level" user plane core network element in LTE, which may consist of the S-GW and the P-GW (serving gateway and packet data network gateway, respectively). The functionalities of the S-GW and P-GW are separated and they are not required to be co- located.
  • base stations 106 and 107 are shown as connected to a wider communications network 1 13 via gateway 112.
  • a further gateway function may be provided to connect to another network.
  • the smaller base stations 1 16, 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 1 16, 1 18 and 120 may be part of a second network, for example WLAN and may be WLAN APs.
  • 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.
  • MS mobile station
  • PDA personal data assistant
  • a mobile communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and so on. Users may thus be offered and provided numerous services via their communication devices. Non-limiting examples of these services comprise two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. Users may also be provided broadcast or multicast data. Non-limiting examples of the content comprise downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • 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.
  • 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 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.
  • ICDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • Signaling mechanisms and procedures which may enable a device to address in-device coexistence (IDC)
  • 3GPP 3rd Generation Partnership Project
  • LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • LTE-A LTE Advanced
  • 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.
  • eNBs evolved or enhanced Node Bs
  • eNBs evolved or enhanced Node Bs
  • eNBs evolved or enhanced Node Bs
  • 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
  • a base station can provide coverage for an entire cell or similar radio service area.
  • a signalling scheme which allows for overload handling on a channel carrying system information.
  • a scheme for a communication system using a shared data channel for transmission of system information such as a system employing a LTE-based radio access technology operated on unlicensed spectrum.
  • Such a scheme may comprise a first transmission comprising a first part or segment of system information related to one or more information elements of a set of system information elements.
  • the first transmission may be transmitted in a first transmission time interval.
  • the scheme may further comprise determining at a communication device whether the first transmission is associated with extension information indicative of one or more second transmissions in one or more second transmission time intervals.
  • the one or more second transmissions may comprise one or more further parts or segments of the system information of the set of system information elements.
  • the communication device may further receive the one or more further parts or segments of the system information in at least one of the one or more second transmissions, if the first transmission is associated with one or more second transmissions, that is, if only a first part or segment of the system information related to a set of system information elements is transmitted in the first transmission.
  • the beneficial effect of such a transmission scheme may be seen in that the suggested segmentation of system information allows for a load adjustment on the channel carrying system information according to current load fluctuations.
  • the scheme avoids in particular applying compression techniques, such as a reduced forward error correction (by using a less robust modulation and coding scheme) according to current load and interference conditions on the channel.
  • Figure 3 shows an example method of a mobile communication device supporting transmission of segmented system information
  • the communication device monitors a downlink control channel, such as PDCCH and EPDCCH in LTE, and determines whether a DL data burst in a first TTI contains system information on a channel, such as PDSCH in LTE.
  • the communication device may receive in the first TTI a first transmission comprising information related to one or more information elements of a set of information elements providing system information. The method proceeds to step 320.
  • the communication device determines whether the first transmission is associated with extension information indicative of one or more second transmissions in one or more second TTIs comprising information related to at least one of the one or more information elements in the set of information elements. The method proceeds to step 330 if the determining is affirmative. Otherwise, the method proceeds to step 340.
  • the communication device receives information related to the at least one of the one or more information elements in at least one of the one or more second transmissions.
  • the communication device receives complete information related to the at least one of the one or more information elements in the first transmission.
  • Figure 4 shows an example method of an access node supporting transmission of segmented system information.
  • the access node prepares for a first TTI a first transmission comprising information related to one or more information elements of a set of information elements providing system information.
  • the access node may notify communication devices in a cell on a downlink control channel of the system information included in the first transmission.
  • the method proceeds to step 420.
  • the access node determines whether the first transmission needs association with extension information indicative of one or more second transmissions in one or more second transmission time intervals comprising information related to at least one of the one or more information elements in the set of information elements.
  • the method proceeds to step 430 if the determining is affirmative. Otherwise, the method proceeds to step 440.
  • the access node transmits information related to the at least one of the one or more information elements in at least one of the one or more second transmissions.
  • the access node transmits complete information related to the at least one of the one or more information elements in the first transmission.
  • the set of information elements in the methods shown in Figures 3 and 4 may be predetermined, and may, for example, comprise information elements similar to those specified in LTE for SIB 1 and SIB 2, or a combination thereof suitable for operating an LTE- based system on unlicensed spectrum. Such a combination is in the following referred to as eSIB.
  • a typical size of a transport block related to a set of information elements may be specified in a system.
  • the typical size may be specified such it can accommodate all information elements in the set of information elements in most deployment scenarios or cell configurations. However, there may be deployment scenarios/cell configurations in which the size of the transport block exceeds the specified typical size.
  • a too big transport block may be split into segments, and the segments may be transmitted in a first and one or more second transmissions.
  • the first transmission may comprise no or only partial information related to the at least one of the one or more information elements. In other words, information related to an information element in a set of information elements may completely missing in the first transmission or only a part of the respective information may be included in the first transmission.
  • the one or more second transmissions may comprise partial or complete information related to the at least one of the one or more information elements.
  • a second transmission may include complete information related to an information element missing in the first transmission, or it may include only a part of the information related to an information element, which is not completely included in the first transmission.
  • An extension indication identifier used on a downlink control channel may notify one or more communication devices of the association between the first transmission and the extension information.
  • the extension indication identifier such as a predetermined eSI-RNTI may be used for indicating that the scheduled system information related to a set of system information elements is incomplete (for example, due to segmentation of the transport block), and needs extension, meaning that the content of the scheduled system information is at a later time extended/completed.
  • the extension indication identifier may also be used for notifying communication devices of transmissions comprising further segments for completing the system information related to the set of system information elements.
  • the specific eSI-RNTI may be used for notifying communication devices of transmissions comprising further segments for completing the system information related to the set of system information elements.
  • the extension information may comprise at least one of:
  • the extension information may indicate whether the system information provided in a transmission is "self-contained" or needs to be completed by information provided in further transmissions.
  • the occurrence information may comprise a boolean value TRUE or FALSE indicating whether further transmissions are needed.
  • the time information may specify the time, for example TTIs or ms or subframes in an LTE-based systems between a first transmission and a second
  • the time information may comprise a time offset configuration.
  • the frequency information may specify the frequency resources, for example physical resource blocks in an LTE-based system, used in a second transmission for completing the system information provided in the first transmission
  • the identifier may be a specific eSI-RNTI, as discussed above, and provided in the first transmission.
  • the identifier information may be indicative of a cell radio network temporary identifier as specified for an evolved universal terrestrial radio access network.
  • the method may further comprise, evaluating a time offset configuration related to the time between the first transmission and the at least one of the one or more second transmissions.
  • the time offset configuration may be predetermined.
  • the time information in the extension information may be indicative of the time offset configuration.
  • the time offset configuration may comprise information indicative of a search window related to the at least one of the one or more second transmissions.
  • the first transmission and the at least one of the one or more second transmissions may occur in the same downlink transmission opportunity.
  • the at least one of the one or more second transmissions may occur in the transmission time interval following the first transmission time interval.
  • the first transmission time interval and the one or more second transmission time intervals may be subframes as specified for an evolved universal terrestrial radio access network.
  • the time offset configuration may comprise at least one of:
  • the time offset may be expressed as a number of subframes or as number of radio frames.
  • the offset may indicate the time between the subframe in which a first transmission was provided and the subframe in which a second transmission is provided in a cell.
  • the offset may only indicate in which system frame number (SFN) a second transmission is scheduled to occur, while a predetermined subframe may be used within the indicated system frame.
  • SFN system frame number
  • the first transmission may comprise a discovery reference signal.
  • the time offset configuration may be based on a discovery measurement timing
  • the first transmission and the at least one of the one or more second transmissions may be subject to execution of a clear channel assessment procedure.
  • Figure 5 shows a signaling diagram illustrating segmentation and transmission of system information according to embodiments of the present invention.
  • Figure 5 shows a first transmission in TTI n comprising system information related to a set of information elements.
  • the set of information elements may be
  • the channel used for transmission of system information may be overloaded in TTI n, and the first transmission may comprise only a first segment 510 of the system information related to the set of information elements.
  • the first transmission is associated with extension information 520 and 540_1 .
  • Extension information 520 in Figure 5 is indicative of a second transmission in TTI n+1 providing a second segment 530 of the system information related to the set of information elements.
  • the second segment 530 may contain at least partial information related to one or more information elements in the set of information elements, in the following referred to as subset of the second segment.
  • Extension information 540_1 in Figure 5 is indicative of a further second transmission in TTI m providing a third segment 550 of the system information related to the set of information elements.
  • Extension information 540_1 may in particular comprise offset information for offset 555.
  • the third segment 550 may contain at least partial information related to one or more information elements in the set of information elements, in the following referred to as subset of the third segment.
  • the subsets of the second and the third information element may share at least one information element in the set of information elements.
  • extension information indicative of the further second transmission in TTI m may be provided in the transmission in TTI n+1 .
  • Extension information 540_2 in the example of Figure 5 is indicative of the further second transmission in TTI m providing the third segment 550.
  • Extension information 540_2 may be provided if the channel used for transmission of system information is overloaded in TTI n+1 .
  • extension information 540_2 related to the third segment of the system information provided in TTI m may at least partially overwrite extension information 540_1 for TTI m.
  • Extension information 540_2 may be indicative of a further second transmission in a TTI, which is not TTI m (not shown in Figure 5), or may be associated with a separate segment of the system information in TTI m (not shown in Figure 5).
  • FIG. 5 shows the transmission of detection reference signals (DRS) 560 in TTIs n, n+1 , n+2, n+3 and n+4.
  • DRS detection reference signals
  • LTE Rel-12 for supporting an efficient on/off mechanism of small cells in a system.
  • DRS have in particular been introduced to facility fast discovery of dormant cells and measurements of dormant cells for radio resource management.
  • a communication device may use DRS for performing discovery measurements according to a preconfigured discovery measurement timing configuration (DMTC) 565.
  • the DMTC may indicate the time instances when a communication device may assume DRS to be present in a downlink transmission.
  • a DMTC may specify a length of the DRS transmission, of for example 5 ms, as shown in Figure 5, and a configurable periodicity of, for example, 40, 80 or 160 ms.
  • the system may need to ensure that DRS transmissions of cells in an area of the network are aligned with the preconfigured DMTC, so as to ensure that the cells can be discovered by the communication device.
  • the DMTC specifies an activity pattern for communication devices in a cell or group of cells, and it may be beneficial to couple transmissions carrying system information with DRS transmissions. It should be understood that each block of the flowchart of the Figures 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.
  • FIG. 7 shows an example of a control apparatus for a communication system, for example to be coupled to and/or for controlling a station of an access system, such as a RAN node, e.g. a base station, (e) node B or 5G AP, a central unit of a cloud architecture or a node of a core network such as an MME or S-GW, a scheduling entity, or a server or host.
  • a RAN node e.g. a base station
  • node B or 5G AP e.g. a base station
  • a central unit of a cloud architecture or a node of a core network such as an MME or S-GW
  • a scheduling entity 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.
  • the control apparatus 300 can be configured to execute an appropriate software code to provide the control functions. Control functions may comprise providing segmenting of system information messages for overload handling.
  • apparatuses may comprise or be coupled to other units or modules etc., such as radio parts or radio heads, used in or for transmission and/or reception.
  • apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the embodiments of this invention may be implemented by computer software executable by a data processor of the mobile device, 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

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Abstract

L'invention concerne un procédé comprenant la réception, dans un premier intervalle de temps d'émission d'un système de communication sans fil, d'une première émission comprenant des informations relatives à un ou plusieurs éléments d'information d'un ensemble d'éléments d'information fournissant des informations de système. Le procédé comprend en outre la détermination si la première émission est associée à des informations d'extension indiquant une ou plusieurs deuxièmes émissions dans un ou plusieurs deuxièmes intervalles de temps d'émission comprenant des informations relatives à au moins l'un ou aux plusieurs éléments d'information dans l'ensemble d'éléments d'information, et en outre, la réception d'informations relatives à au moins l'un ou aux plusieurs éléments d'information dans au moins l'une ou les plusieurs deuxièmes émissions si la détermination est affirmative.
PCT/EP2016/078565 2015-11-25 2016-11-23 Informations de système segmentées dans un système de communication sans fil WO2017089405A1 (fr)

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