• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for direct communication between mobile terminals using GSM carrier frequencies, wherein each carrier frequency transmits TOMA frames with a TDMA frame duration of 4.615 ms and each TOMA frame comprises 8 time slots with a duration of 577 microseconds, characterized in that a multiframe is agreed by combining several, preferably 26, TOMA frames, wherein the participating terminals are operated in simplex mode and always send and receive within an agreed TDMA frame of the multiframe in separate time slots.
    公开号:AT515238A1
    申请号:T12/2014
    申请日:2014-01-09
    公开日:2015-07-15
    发明作者:Hanan Armoni；Saar Shlapoverski
    申请人:Hanan Armoni；
    IPC主号:
    专利说明:

    Method and system for direct communication of mobile terminals
    The invention relates to a method and a system for direct communication of mobile terminals.
    The GSM standard for mobile voice and data transmission between mobile terminals, which is used worldwide, transmits the digital data using a mixture of frequency division multiplexing and Time Division Multiple Access (TDMA), in which transmission and reception bands are provided in different frequency bands. The GSM frequency band is divided into several channels that are 200 kHz apart. For GSM 900, there are 124 channels for the uplink (uplink) to the base station in the range of 890-915 MHz, and 124 channels for the downlink (downlink) in the range of 935-960 MHz.
    The TDMA frame duration is approximately 4.615 ms and corresponds to the duration of exactly 1250 symbols. Each of the eight time slots per frame thus takes approximately 0.577 ms, corresponding to the duration of 156.25 symbols. In these timeslots, bursts of various types can be sent and received. The duration of a normal burst is approximately 0.546 ms in which 148 symbols are transmitted.
    After transmitting a receive burst, the mobile will switch to the transmit frequency offset by 45 MHz, where it will send the burst of the return channel to the base station. Since downlink and uplink occur offset by three time slots, one antenna suffices for both directions.
    However, a GSM telephony system still requires an upright network provided by one or more base stations. Communication of the terminals together is not provided with this system.
    The object of the invention is to provide a transmission method with which two or more mobile terminals, which are constructed according to the GSM standard, can also perform a direct communication with each other. This should be done without changing the hardware by purely software changes.
    Operation in direct mode is intended to enable communication even if the network fails, e.g. in case of disaster or if there is no network for other reasons, for example in rural areas or in the case of commercial use, for example by rail workers. Since direct mode is non-network dependent, there are no network dependent costs in data transmission. be large construction sites, where many employees communicate with each other, which can cause significant costs in network operation.
    This object is achieved in accordance with the invention by using the existing GSM carrier frequencies, each carrier frequency transmitting TDMA frames with a TDMA frame duration of 4.615ms and each TDMA frame comprising 8 timeslots of 577 microseconds duration, and further comprising aggregating several , preferably 26, TDMA frame a multiframe is agreed, wherein the participating terminals are operated in simplex mode and always within an agreed TDMA frame of the multiframe send and receive in mutually separated time slots.
    This has the advantage that the conventional GSM transmission is not affected: the terminals can still transmit and receive in the GSM system, in the unused time slots of the multiframe. Only individual time slots of the GSM transmission frames are used for simplex communication with other terminals. The participating terminals use the GSM transmission frame and build their own synchronized self-synchronizing and frequency-locked multiframes within which they can communicate with each other in a simplex manner.
    According to the invention, through an internal filter of the terminals, a particular frequency range may be selected for direct communication, which overlaps with, or preferably comprises, the GSM uplink or GSM downlink frequency band. However, a separate license-free frequency band can also be used for the direct communication.
    According to the invention, it may be provided that in two TDMA frames, preferably at positions 11 and 25 of the multiframe, frequency correction burst FCCH and in two further TDMA frames, preferably at positions 12 and 25 of the multiframe, synchronization burst SCH and in the remaining TDMA Multi-frame framing data bursts TCH.
    According to the invention, 158.25 bits can be transmitted in each time slot, a data burst TCH comprising a training sequence of 26 bits and two data packets of 57, a synchronization burst SCH comprising a training sequence of 64 bits and two data packets of 39 bits each, and the frequency correction burst FCCH 142 bits with the symbol " 0 " includes.
    According to the invention, it can be provided that a mobile terminal assumes a repeater function, wherein it forwards a data packet received in a first time slot, preferably in position TSO, of an agreed TDMA frame in a second time slot, preferably at position TS3, of the same TDMA frame.
    According to the invention, it can be provided that the terminal, depending on whether it is the first, second or third repeater, broadcasts the received data packet in different time slots within the agreed TDMA frame, preferably at position TS3, TS4 and TS5. This prevents a collision of the data packets in overlapping areas between the originally transmitted signal and the signal transmitted by the repeater.
    According to the invention, the method for direct communication by pure software methods in the mobile terminal is implemented as a stand-alone method, thus can be executed without network coverage. It may be practicable simultaneously with a GSM transmission.
    Software level new Level 1, Level 2 and Level 3 protocols may be provided while the signal processor and all hardware functions are shared with the GSM functionality.
    The invention further relates to a mobile terminal, in particular a mobile telephone, which is set up to carry out a method according to the invention, as well as a system of a multiplicity of mobile terminals, on which a method according to the invention is carried out.
    Fig. 1 shows an embodiment of a corresponding multiframe 3 comprising 26 individual TDMA frames 1. Each TDMA frame 1 comprises eight time slots 2 designated TSO to TS7. When using direct communication, bursts called TCH, FCCH and SCH are transmitted in the time slots. The abbreviation TCH denotes the traffic channel burst containing the voice data to be transmitted. FCCH means Frequency Correction Channel, and SCH is the Synchronization Channel. The frames 11 and 24 within the multiframe transmission of the frequency correction bursts FCCH, and the frames 12 and 25 serve to transmit the synchronization bursts SCH. In both the transmit mode and the receive mode, within the multiframe in each TDMA frame, only the first time slot TSO is allocated for transmission or reception, while the other time slots TS1 to TS7 remain idle. The transmission is in simplex mode so that a mobile device can only ever either send or receive.
    Fig. 2 shows the structure of a TCH data burst, a SCH synchronization burst and an FCCH frequency correction burst. 114 data bits are transmitted in a TCH data burst, 78 data bits in an SCH synchronization burst, and no data bits in a frequency correction burst.
    When operating terminals in direct mode, the range is limited by the relatively low transmission power and by terrain influences. The present invention therefore also provides the possibility that the mobile terminals according to the invention take over a repeater function and, like a relay station, mediate the data transmission between two or more other terminals.
    Fig. 3 shows the basic situation in the execution of the repeater function. A sender transmits data to a first repeater in direct communication. This is still within range of the sender, receiving the data and sending it within its range. A second repeater, which is within range of the first repeater, receives the data and transmits it in its transmission area. This allows for direct communication between terminals that are not in the same coverage area.
    Fig. 4 shows the transmission protocol in the repeater function. Each frame not only operates in time slot 1, but uses the remaining time slots. The first time slot TSO is used to receive the transmitted burst. Through time slot TS3, the signal is passed from the talker and the first repeater. The second repeater receives in time slot 1 labeled Rx and transmits the signal over time slot TS4. Another repeater would also receive the data in time slot TSO, but forward it in time slot TS5.
    Also in the repeater function, the transmission is in simplex mode so that each mobile terminal can only either send or receive.
    Figs. 5a and 5b show the structure of the software stack for the subject method in a layer model compared to the conventional GSM software stack. The DM protocol stack in L2 or L3 includes a Direct Transmission (DT) call control module, a Mobility Management (MM) module supporting Mobile ID, User ID, or Group ID, a Security (SE) module supporting UserMode and Supervisor Fashion as well as a Radio Resource Management (RR) module.
    The near-hardware DM L1 protocol (not shown) is implemented as an extension of the GSM L1 protocol and can be implemented in the GSM L1A or L1S layer and provides the correct assignment of the time slots, TDMA frames and the correct construction of the multiframe used.
    The invention is not limited to the present embodiments, but includes all methods and systems within the scope of the following claims.
    权利要求:
    Claims (8)
    [1]
    Claims 1. A method for direct communication between mobile terminals using GSM carrier frequencies, each carrier frequency transmitting TDMA frames (1) with a TDMA frame duration of 4.615ms and each TDMA frame comprising 8 time slots (2) with a duration of 577 microseconds thereby characterized in that a multiframe (3) is arranged by combining a plurality, preferably 26, TDMA frames, the involved terminals being operated in simplex mode and always transmitting and receiving within disjoint time slots within an agreed TDMA frame (1) of the multiframe.
    [2]
    2. The method according to claim 1, characterized in that in two TDMA frames (1), preferably at the positions 11 and 25 of the multiframe (3), frequency correction bursts FCCH and in two further TDMA frames, preferably at the positions 12th and 25 of the multiframe, synchronization bursts SCH and in the remaining TDMA frames of the multiframe data bursts TCH.
    [3]
    A method according to claim 2, characterized in that 158.25 bits are transmitted in each time slot (2), a data burst TCH comprising a training sequence of 26 bits and two data packets of 57, a synchronization burst SCH a training sequence of 64 bits and two data packets of 39 bits each, and the frequency correction burst FCCH 142 bits with the symbol " 0 " includes.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that a mobile terminal takes on a repeater function, wherein there is a received in a first time slot, preferably in position TSO, an agreed TDMA frame data packet in a second time slot, preferably at position TS3 , the same TDMA frame broadcasts.
    [5]
    A method according to claim 4, characterized in that the terminal broadcasts the received data packet in different time slots within the agreed TDMA frame, preferably at positions TS3, TS4 and TS5, depending on whether it is the first, second or third repeater.
    [6]
    6. Mobile terminal, in particular a mobile telephone, characterized in that it is adapted to carry out a method according to one of claims 1 to 5.
    [7]
    A mobile terminal according to claim 6, characterized in that the GSML layers 1, 2 and 3 are adapted for carrying out a method according to any one of claims 1 to 5.
    [8]
    8. System of a plurality of mobile terminals according to one of claims 6 or 7, characterized in that a method according to one of claims 1 to 5 is carried out.
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    同族专利:
    公开号 | 公开日
    AT515238B1|2015-11-15|
    CA2936310A1|2015-07-16|
    AU2014376884A8|2016-06-30|
    EP3092726B1|2018-04-04|
    EP3092726A1|2016-11-16|
    US20160345373A1|2016-11-24|
    US10129913B2|2018-11-13|
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    NZ720370A|2020-07-31|
    AU2014376884A1|2016-06-09|
    AU2014376884B2|2018-09-20|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA12/2014A|AT515238B1|2014-01-09|2014-01-09|Method and system for direct communication of mobile terminals|ATA12/2014A| AT515238B1|2014-01-09|2014-01-09|Method and system for direct communication of mobile terminals|
    NZ720370A| NZ720370A|2014-01-09|2014-05-13|Method and system for direct communication between mobile terminals|
    PCT/IB2014/061399| WO2015104592A1|2014-01-09|2014-05-13|Method and system for direct communication between mobile terminals|
    EP14727376.7A| EP3092726B1|2014-01-09|2014-05-13|Method and system for direct communication between mobile terminals|
    US15/107,788| US10129913B2|2014-01-09|2014-05-13|Method and system for direct communication between mobile terminals|
    CA2936310A| CA2936310A1|2014-01-09|2014-05-13|Method and system for direct communication between mobile terminals|
    AU2014376884A| AU2014376884B2|2014-01-09|2014-05-13|Method and system for direct communication between mobile terminals|
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