WO2014057431A2 - Procédé et appareil pour système de communication - Google Patents

Procédé et appareil pour système de communication Download PDF

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Publication number
WO2014057431A2
WO2014057431A2 PCT/IB2013/059229 IB2013059229W WO2014057431A2 WO 2014057431 A2 WO2014057431 A2 WO 2014057431A2 IB 2013059229 W IB2013059229 W IB 2013059229W WO 2014057431 A2 WO2014057431 A2 WO 2014057431A2
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WO
WIPO (PCT)
Prior art keywords
local area
area cell
discovery signal
user equipment
cell
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Application number
PCT/IB2013/059229
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English (en)
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WO2014057431A3 (fr
Inventor
Samuli Turtinen
Sami-Jukka Hakola
Timo Koskela
Anna Pantelidou
Original Assignee
Broadcom Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Broadcom Corporation filed Critical Broadcom Corporation
Publication of WO2014057431A2 publication Critical patent/WO2014057431A2/fr
Publication of WO2014057431A3 publication Critical patent/WO2014057431A3/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/22—Self-organising networks, e.g. ad-hoc networks or sensor networks with access to wired networks

Definitions

  • the present invention relates to a method and apparatus for a communication system. Some embodiments of the invention relate to the field of cellular communications and, particularly, to cell and device discovery in a cellular communication system, in particular a system supporting local area cells and device- to-device connections. Background
  • the processing system may comprise at least one processor; and at least one memory including a computer program code.
  • Figure 2 illustrates a flow diagram of a procedure for providing wireless connectivity according to an embodiment of the invention
  • Figure 3 illustrates a signalling diagram related to providing local area cell connectivity according to an embodiment of the invention
  • Figure 4 illustrates signal structures of a device-to-device discovery signal and a local area cell discovery signal according to embodiments of the invention
  • Figures 5 to 7 illustrate embodiments for attaching user equipment to a local area cell provided by another user equipment according to an embodiment of the invention
  • Figure 8 illustrates a flow diagram of a discovery signal search procedure carried out by user equipment according to an embodiment of the invention.
  • Figure 9 illustrates a block diagram of an apparatus according to an embodiment of the invention.
  • Figure 1 illustrates a wireless communication scenario to which embodiments of the invention may be applied.
  • a macro cell base station 104 of a cellular communication system provides wireless access within its coverage area 100 comprising one or more cells.
  • the macro cell base station 104 is part of a fixed infrastructure of a cellular network operator, and it is designed through network planning to provide constant wireless access within its coverage area 100.
  • the macro cell base station 104 may be connected to a core network 106 of the cellular communication system.
  • the core network 106 may comprise core network entities such as a mobility management entity (MME) 102 providing control functions and gateways for data routing.
  • MME mobility management entity
  • UE 110, 120 utilize the wireless access to create connections to other UEs and/or to other networks through the macro cell base station and through the cellular communication system.
  • the UEs 1 10, 120 may also be called terminal devices, mobile terminals, etc.
  • the UEs 110, 120 may additionally utilize direct device-to-device (D2D) connections established directly between two UEs.
  • the D2D connections may utilize radio resources of a radio access network of the cellular communication system, e.g. radio resources of the macro cell base station 104, but the connection itself is not routed through any mediating device, e.g. the radio access network or the macro cell base station 104.
  • the D2D connections may also be called proximity services because of the close mutual proximity of the communicating UEs.
  • the cellular communication system may support establishment of local area cells within its coverage area that are not part of the network operator's network planning. These local area cells are called femto cells and home Node Bs in the literature.
  • the local area cell is created by a local area base station connected to the cellular communication system via a wired or wireless connection.
  • the coverage area of the local area cell is typically significantly smaller than the coverage area 100 of the macro cell base station 104.
  • the local area base station may employ the radio resources and a radio access protocol of the macro cell base station 104, or it may employ another radio access protocol, e.g. IEEE 802.11 (Wi-Fi).
  • the radio access protocol of the cellular communication system may be Universal Mobile Telecommunication System Long-Term Evolution (UMTS LTE) or LTE-Advanced (LTE-A) but it should be appreciated that the present invention applies also to other cellular communication systems.
  • the local area cell may refer to a 3 rd Generation Partnership Project (3 GPP) release and onwards compliant concept of 3GPP local area. Alternatively it can refer to a non-backward compatible type of new local area cell utilizing a new form of radio carrier.
  • 3 GPP 3 rd Generation Partnership Project
  • One use case for the above-mentioned proximity services is in public safety systems, e.g. police and emergency communications.
  • LTE has been selected as the technology for a Public Safety Network.
  • a public safety network may operate on a dedicated frequency spectrum outside the frequency spectra of the commercial cellular communication systems or, in general, commercial radio systems.
  • a public safety device may be configured to operate in both the public safety spectrum and commercial network spectrum. However, only the public safety spectrum may be used for public safety proximity services.
  • Public safety devices may use the proximity services or D2D connections to communicate with each other even though they belong to different public land mobile telecommunication networks (PLMNs).
  • PLMNs public land mobile telecommunication networks
  • a public safety device may automatically use the proximity services when the coverage of the cellular communication system is not available, or the user may manually set the public safety device to use D2D discovery and communication even when network coverage is available.
  • the proximity services of the public safety network may be characterized by following features: all public safety users may utilize the devices supporting the proximity services and the proximity services support both device discovery and data exchange.
  • a UE of the cellular communication system e.g. the UE 120
  • the UE 120 is configured to support the D2D connections and the operation as an ad hoc local area cell.
  • the UE 120 may support the operation in the public safety systems, e.g. it may be used to establish the local area base station in a crisis area for a better connectivity.
  • Figure 2 illustrates a flow diagram of the operation of the UE according to an embodiment of the invention. Referring to Figure 2, the UE 120 is configured to support direct device-to-device connectivity with at least one other UE 110 and to transmit a device-to-device discovery signal indicating the availability of the device- to-device connectivity to the at least one other UE 110 (block 200).
  • the UE 120 is configured to operate as the local area cell by acquiring operational parameters required for the operation as the local area cell and by causing transmission of a local area cell discovery signal from the UE 120 to indicate the availability of the local area cell to the at least one other UE 110.
  • the UE 120 thus operates in two roles: as a terminal device and as the local area base station. It may switch between these two roles or operate them simultaneously, depending on the embodiment.
  • the UE 120 may autonomously control the radio access of the other UEs 110 connected to the local area cell within the coverage area 101 of the UE 120 and within the radio resources allocated to the local area cell.
  • the radio resources may be allocated by the macro cell base station 104 and, additionally, at least one other network entity of the cellular communication system may assign other parameters required for the operation of the local area cell.
  • Figure 3 illustrates a signalling diagram of an embodiment for configuring the UE 120 to establish the local area cell within the coverage area of a macro system comprising the radio access network and a core network of the cellular communication system.
  • the UE 120 is connected to the macro network in block 300.
  • the macro network connection may refer to a wireless cellular connection in which the UE 120 has been registered with the macro network, and the UE 120 may be connected to the macro network either in an idle mode or a connected mode.
  • the macro network connection is a wired connection, e.g. Ethernet connection.
  • D2D connectivity is also enabled in the UE 120 (block 302).
  • the D2D connectivity being enabled may be defined such that the UE 120 is able to establish a D2D connection with at least one other UE 110, and it may transmit D2D discovery signals 304 to announce the availability of the D2D connectivity. Contents of the D2D discovery signal are discussed in connection with Figure 4 below.
  • the other UE 110 may scan for discovery signals in 305.
  • the UE 120 determines to establish the local area cell and, accordingly, requests for the establishment of the local area cell from the macro network.
  • Step 306 may be triggered in response to a user input, for example. The user may thus control the establishment of the local area cell.
  • at least one element of the macro network processes the request and authorises the establishment of the local area cell.
  • the authorising network element may be a core network entity, e.g. the MME 102.
  • the core network entity may also provide at least some of the operational parameters required for the operation of the local area cell, e.g. a cell identifier, through non-access stratum (NAS) signalling.
  • NAS non-access stratum
  • an element of the radio access network e.g.
  • a radio resource controller (RRC) of the macro cell base station 104 may provide radio resource control parameters such as a radio resource allocation in response to receiving an indication about the authorised establishment of the local area cell.
  • the authorisation and the operational parameters may be transferred as temporary cell information (TCI) from the macro system to the UE 120 in step 308.
  • TCI temporary cell information
  • the transfer may comprise signalling on a plurality of control plane levels, e.g. on the NAS level and RRC level.
  • the RRC may be used for resource allocation, while the NAS signalling may be used for overall control of the local area cell establishment, operation, and termination.
  • the NAS signalling may be used between the UE 120 and the core network entity, while the RRC signalling may be used between the macro cell base station 104 and the UE 120.
  • the operational parameters transferred in step 308 may comprise at least some of the following: the radio resource allocation, at least one cell identifier, initial access parameters used for accessing the cell, and a time value specifying the duration for how long the local area cell may operate.
  • the UE 120 Upon receiving the authorisation and the operational parameters in 308, the UE 120 adopts the operational parameters in 310 and reconfigures itself to operate as an access point.
  • the UE 120 also configures its radio transceiver parts to form a frame structure complying with a default frame structure of a local area base station of the cellular communication system.
  • the UE 120 configures its radio transmitter to transmit a local area cell discovery signal indicating the presence of the local area cell to the other UEs 110.
  • the D2D discovery signal transmitted in 304 and the local area cell discovery signal transmitted in 312 have the same physical layer parameters, e.g. the same modulation and coding scheme. This facilitates the detection in the other UEs 110 (in step 305), since the other UEs may detect both discovery signals with the same physical layer procedure.
  • the UE 110 When carrying out the search for the discovery signals in 305, the UE 110 detects the local area cell discovery signal in step 314. In step 316, the UE 110 determines the initial access parameters from the local area cell discovery signal, e.g. by determining from at least one identifier comprised in the discovery signal that the UE 110 may connect with the correct macro network through the local area cell provided by the UE 120and by determining random access channel parameters used for connection establishment. In step 316, the UE 1 10 transmits an attachment request to the UE 120 according to the initial access parameters to the UE 120. In step 318, the UE 318 processes the attachment request, authenticates the UE 110, and prepares control and user plane contexts for the UE 110. Step 318 may also comprise signalling with the macro network. Upon attaching the UE 110 to the local area cell and to the macro network, the UE 120 confirms the completed attachment and provides the UE 110 with a wireless access to the macro network via the local area cell provided by the UE 120.
  • the operation of the local area cell provided by the UE 120 may be terminated by an explicit termination command from the core network entity via the NAS signalling, for example, or upon expiry of a timer counting the time value specifying the active duration of the local area cell, as provided by the core network entity.
  • the establishment of the local area cell by the UE 120 may be triggered by the user input, by the UE 120 autonomously, or by the macro network. For example, if the macro cell base station 104 detects that its capacity is running low, it may configure the UE 120 to establish the local area cell to increase the capacity within the macro cell 100.
  • the UE 120 may be configured to trigger the establishment of the local area cell autonomously upon detecting that it is out of radio coverage of the cellular communication system or that the radio coverage is poor, e.g. communication quality with the macro cell base station below a threshold.
  • the UE 120 may use the cellular connection or other means for connecting to the macro network for authorization, e.g. a Wi-Fi connection or a wired connection. In a public safety system, for example, when a rescue team arrives at a disaster scene where there is no cellular network coverage, the UE 120 may autonomously start acting as a cell.
  • the D2D discovery signal and the local area cell discovery signal may have common characteristics, e.g. the same physical layer parameters and/or partially the same contents.
  • Figure 4 illustrates an embodiment of the D2D discovery signal 424 and an embodiment of the local area cell discovery signal 426.
  • the D2D discovery signal 424 may comprise a synchronization sequence 400 at the head of the D2D discovery signal to facilitate a receiver to synchronize to the frame of the signal 424.
  • the D2D discovery signal 424 may further comprise a discovery signal type indicator 402 specifying whether the discovery signal is the D2D discovery signal 424 or the local area cell discovery signal 426.
  • the discovery signal type indicator 402 may be a one-bit indicator, wherein one value specifies that the signal is the D2D discovery signal 424 and the other value specifies that the signal is the local area cell discovery signal 426.
  • the D2D discovery signal 424 may further comprise D2D discovery information 404 comprising a D2D identifier of the UE 120 transmitting the D2D discovery signal, application layer information related to the D2D connection, e.g. application type used for the D2D connection, etc.
  • the D2D discovery signal 424 may further comprise an extension part indicator 406 indicating whether or not the D2D discovery signal comprises additional, optional field(s) 408.
  • the optional fields 408 may comprise additional application layer information.
  • the D2D discovery signal 424 may comprise a fixed part 420 always contained in the D2D discovery signal and an optional extension part 422 which may be included into or omitted from the D2D discovery signal 424.
  • the fixed part has the same length as the length of the local area cell discovery signal 426.
  • the local area cell discovery signal 426 may also comprise the synchronization sequence 410 and the discovery signal type indicator 412 fields that may be similar to the corresponding fields in the D2D discovery signal 424.
  • the local area cell discovery signal 426 may further comprise an information element 414 comprising the TCI and/or the initial cell access information enabling a UE 110 receiving the signal 426 to establish a cellular connection with the local area cell.
  • the initial cell access information may include at least a cell identifier identifying the local area cell provided by the UE 120.
  • the cell identifier may be the same as or similar to the D2D device identifier comprised in the D2D discovery signal 424.
  • the initial cell access information may comprise a master information block (MIB) specifying downlink bandwidth of the local area cell, physical channel hybrid automatic repeat request indicator channel (PHICH) configuration, and a system frame number (SFN).
  • the initial cell access information may further comprise one or more system information blocks (SIB), e.g. SIB type 1 indicating the PLMN (the macro network) to which the UE 120 is connected, a tracking area code, cell selection information, a frequency band indicator, and scheduling information (periodicity) of other SIBs.
  • SIB system information blocks
  • the initial cell access information may further comprise SIB 2 specifying channel configurations for a random access channel (RACH) a broadcast control channel (BCCH), a physical control channel (PCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH), a sounding reference signal configuration, UE timers, etc.
  • the TCI may comprise an information element indicating that the transmitter of the local area cell discovery signal 426 is a local area base station of a temporary local area cell, an information element indicating the backhaul connection to the macro network and/or properties of the backhaul connection.
  • the properties may include a capacity metric indicating the data rate or a quality-of-service classification of the connectivity provided by the UE 120.
  • the information element indicating the backhaul connection may specify whether the backhaul connection is a wired or wireless connection.
  • Figures 5 to 7 illustrate embodiments for carrying out the attachment of the UE 110 to the local area cell when the UE 120 operates the local area cell.
  • Figures 5 to 7 may be considered as embodiment of steps 316 to 320 from the point of view of the UE 120 and, in some cases, the macro network.
  • Figure 5 illustrates an embodiment where the UE 120 mediates between the UE 110 and the macro network during the attachment procedure.
  • the macro network may carry out at least some steps of the attachment procedure, e.g. security functions such as the authentication of the UE 110 to be attached.
  • the UE 120 operating the local area cell acquires the attachment request from the UE 110 in block 500.
  • the UE 120 Upon receiving the attachment request, the UE 120 forwards the attachment request to the macro network in 502.
  • the macro network may carry out at least authentication of the UE 110 in block 504.
  • Block 504 may comprise signalling between the macro network and the UE 110, and such signalling may be mediated by the UE 120.
  • the macro network may confirm the attachment in 506 and, in some embodiment, provide the UE 120 with at least some of the contextual parameters for the connection with the UE 110.
  • the UE 120 may then establish the context for the UE 110 and start providing the UE 110 with the wireless access to the macro system in 508.
  • Figure 6 illustrates an embodiment where the UE 120 receives the necessary attachment parameters from the macro network beforehand and carries out the attachment of the UE 1 10 autonomously.
  • the macro network transfers the attachment parameters to the UE 120 in 600, e.g. in connection with step 308.
  • the attachment parameters may comprise authentication parameters, e.g. security keys.
  • the UE 120 may carry out at least some of the procedures of the attachment, e.g. the authentication, autonomously. In this embodiment, the UE 120 carries out block 504.
  • Figure 7 illustrates another embodiment where the UE 120 carries out the attachment autonomously.
  • the UE 120 may store beforehand necessary authentication parameters in its memory in block 700.
  • the public safety devices may use security keys from a common family of security keys that share the same characteristics or they may respond in a similar manner to a certain authentication challenge provided by the UE 120. Accordingly, there is no need to transmit any authentication parameters from the macro network to the UE 120.
  • the UE 120 may carry out the authentication in 504 and determine whether or not the UE 1 10 that transmitted the attachment request is another public safety device. If the UE 110 is identified as the public safety device, the UE 120 may approve the attachment request and attach the UE 110 to the local area cell.
  • the UE 110 receives and detects a discovery signal in block 800. The detection may be based on correlating received radio signals with a synchronization sequence the UE 110 is searching for.
  • the UE 110 demodulates and decodes the contents of the received discovery signal on the physical layer in block 802 and forwards the decoded contents to a higher layer processing.
  • the contents of the discovery signal are analysed by extracting the discovery signal type indicator 402, 412 and analysing its value (block 804).
  • the UE 110 may determine whether the discovery signal is a D2D discovery signal 424 indicating the presence of D2D connectivity or a local area cell discovery signal indicating the availability of a local area cell connectivity (block 806).
  • the UE 120 may switch its operation mode between a D2D operation mode and a local area base station operation mode.
  • the UE 120 provides the D2D connectivity
  • the UE 120 provides the local area cell connectivity.
  • the UE 120 may transmit the D2D discovery signal 424 as the only discovery signal, while it may transmit the local area cell discovery signal 426 as the only discovery signal in the local area cell base station mode.
  • the UE 120 may support simultaneous operation of the D2D operation mode and the local area cell base station mode. In such an embodiment, the UE 120 may transmit the D2D discovery signals 424 and the local area cell discovery signals 426 concurrently.
  • the discovery signals 424, 426 may be transmitted with the same, different, or overlapping timing.
  • transmission of a first discovery signal indicates implicitly a transmission resource of another discovery signal.
  • the other discovery signal may comprise reduced contents, e.g. a transmitter identifier of the other discovery signal and or the synchronisation sequence may be omitted.
  • the synchronization may be acquired from the first discovery signal, if a timing offset between the two signals is known, and the transmitter is inherently obvious to the receiver from the transmitter identifier contained in the first discovery signal and the link between the transmissions of the first and the other discovery signal.
  • the UE 120 may determine whether or not other local area cells have been detected within the proximity of the UE 120, e.g. within a detection range of the UE 120 or within the same macro cell 100. If another local area cell is detected, the UE 120 may synchronize to the other local area cell at least one a frame level and transmit the local area cell discovery signal 426 in synchronisation with the other local area cell.
  • the synchronisation may be used with frequency reuse, for example.
  • Figure 9 illustrates a block diagram of an apparatus comprising means for providing the D2D connectivity and the local area cell connectivity according to an embodiment of the invention.
  • the apparatus may be applicable to the UE 120.
  • the apparatus may be a wireless terminal device which complies with specifications of the above-described cellular communication system.
  • the wireless terminal device may also be a cognitive radio apparatus capable of adapting its operation to a changing radio environment, e.g. to changes in parameters of another system or other devices on the same frequency band.
  • the wireless terminal device may be or may be comprised in a computer (PC), a laptop, a tablet computer, a cellular phone, a palm computer, or any other user equipment provided with radio communication capability.
  • the apparatus is comprised in such a wireless terminal device, e.g. the apparatus may comprise a circuitry, e.g. a chip, a processor, a micro controller, or a combination of such circuitries in the wireless terminal device.
  • the apparatus may comprise a communication controller circuitry 10 configured to control wireless communications in the wireless terminal device.
  • the communication controller circuitry 10 may comprise a control part 12 handling control plane communication with respect to transmission, reception, and extraction of signalling information over a control plane connection with the macro network and control information related to D2D connections and local area cell connections with at least one other terminal device.
  • the control part 12 may be configured to communicate with the macro network over a wireless cellular radio connection and/or over a wired connection.
  • the communication controller circuitry 10 may further comprise a data part 16 that handles transmission and reception of payload data over a user plane connection with the macro network and payload data related to D2D connections and local area cell connections with at least one other terminal device.
  • the communication control circuitry 10 may further comprise a D2D controller circuitry 18 configured to establish, maintain, and operate the D2D connectivity in the apparatus.
  • the D2D controller circuitry 18 may cause the control part 12 to transmit the above-described D2D discovery signals 424 to announce the presence of the D2D connectivity.
  • the D2D controller circuitry 18 may control the data part to carry out data transmission related to the D2D connection.
  • the communication control circuitry 10 may further comprise a local area cell controller circuitry 14 configured to control the operation of the local area cell connectivity in the apparatus.
  • the local area cell controller circuitry 14 may carry out the establishment, operation, and termination of the local area cell mode in the apparatus.
  • the local area cell controller circuitry 14 may also cause the control part 12 to transmit the local area cell discovery signals 426.
  • the local area controller circuitry 14 and the D2D controller circuitry 16 may communicate with each other in the embodiment where the discovery signals 424, 426 are transmitted as linked with each other, or the control part 12 may provide the linking autonomously.
  • the circuitries 12 to 18 of the communication controller circuitry 10 may be carried out by the one or more physical circuitries or processors. In practice, the different circuitries may be realized by different computer program modules. Depending on the specifications and the design of the apparatus, the apparatus may comprise some of the circuitries 12 to 18 or all of them.
  • the apparatus may further comprise a memory 20 that stores computer programs (software) configuring the apparatus to perform the above-described functionalities of the UE 120.
  • the memory 20 may also store communication parameters and other information needed for the wireless communications including the D2D communications and local area cell communications.
  • the apparatus may further comprise radio interface components 22 providing the apparatus with radio communication capabilities within the cellular communication system and, in some embodiments, with at least one other radio system, e.g. the Wi-Fi system.
  • the radio interface components 22 may comprise standard well-known components such as an amplifier, filter, frequency-converter, (de)modulator, and encoder/decoder circuitries and one or more antennas.
  • the apparatus may further comprise a user interface enabling interaction with the user of the wireless device.
  • the user interface may comprise a display, a keypad or a keyboard, a loudspeaker, etc.
  • the apparatus carrying out the embodiments of the invention in the wireless device comprises at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to carry out the functionalities of the UE 120 according to any one of the processes described above in connection with Figures 2 to 7.
  • the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to carry out the functionalities of the UE 110 according to Figure 8.
  • the embodiment of Figure 8 may also be carried out by the UE 120 when the UE 120 is searching for discovery signals transmitted by the other terminal devices or local area cell base stations.
  • the at least one processor, the memory, and the computer program code form processing means for carrying out embodiments of the present invention in the user equipment of the cellular communication system.
  • circuitry refers to all of the following: (a) hardware-only circuit implementations such as implementations in only analog and/or digital circuitry; (b) combinations of circuits and software and/or firmware, such as (as applicable): (i) a combination of processor(s) or processor cores; or (ii) portions of processor(s)/software including digital signal processor(s), software, and at least one memory that work together to cause an apparatus to perform specific functions; and (c) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor, e.g. one core of a multi-core processor, and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular element, a baseband integrated circuit, an application-specific integrated circuit (ASIC), and/or a field-programmable grid array (FPGA) circuit for the apparatus according to an embodiment of the invention.
  • ASIC application-specific integrated circuit
  • FPGA field-programmable grid array
  • the processes or methods described in Figures 2 to 8 may also be carried out in the form of a computer process defined by a computer program.
  • the computer program may be in source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, which may be any entity or device capable of carrying the program.
  • Such carriers include transitory and/or non-transitory computer media, e.g. a record medium, computer memory, read-only memory, electrical carrier signal, telecommunications signal, and software distribution package.
  • the computer program may be executed in a single electronic digital processing unit or it may be distributed amongst a number of processing units.
  • the present invention is applicable to cellular or mobile communication systems defined above but also to other suitable communication systems.
  • the protocols used, the specifications of mobile communication systems, their network elements and user equipment, develop rapidly. Such development may require extra changes to the described embodiments. Therefore, all words and expressions should be interpreted broadly and they are intended to illustrate, not to restrict, the embodiment. It will be obvious to a person skilled in the art that, as technology advances, the inventive concept can be implemented in various ways.
  • the invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

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

Abstract

L'invention porte sur une solution pour configurer un équipement utilisateur (UE) d'un système de communication cellulaire afin de prendre en charge une connectivité de dispositif à dispositif (D2D) directe avec au moins un autre équipement utilisateur et d'envoyer un signal de découverte de dispositif à dispositif indiquant la disponibilité de la connectivité de dispositif à dispositif à l'au moins un autre équipement utilisateur. En outre, l'équipement utilisateur est configuré pour fonctionner à titre de cellule locale par acquisition de paramètres opérationnels requis pour le fonctionnement à titre de cellule locale et par provocation de l'émission d'un signal de découverte de cellule locale provenant de l'équipement utilisateur afin d'indiquer la disponibilité de la cellule locale à l'au moins un autre équipement utilisateur.
PCT/IB2013/059229 2012-10-10 2013-10-09 Procédé et appareil pour système de communication WO2014057431A2 (fr)

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GB201218201A GB2506886A (en) 2012-10-10 2012-10-10 A cellular communications system supporting local area cells and device-to-device communications
GB1218201.0 2012-10-10

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WO2014057431A2 true WO2014057431A2 (fr) 2014-04-17
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CN106664643A (zh) * 2014-07-08 2017-05-10 三星电子株式会社 装置至装置(d2d)通信中由用户设备(ue)执行公共陆地移动网络间发现的方法
CN111183597A (zh) * 2018-01-11 2020-05-19 索尼公司 电子设备、无线通信方法和计算机可读存储介质

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GB2524298A (en) 2014-03-19 2015-09-23 Nec Corp Device-to-device radio resource management
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