WO2014161164A1 - Procédé et appareil pour établir une communication dans une situation d'urgence - Google Patents

Procédé et appareil pour établir une communication dans une situation d'urgence Download PDF

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Publication number
WO2014161164A1
WO2014161164A1 PCT/CN2013/073680 CN2013073680W WO2014161164A1 WO 2014161164 A1 WO2014161164 A1 WO 2014161164A1 CN 2013073680 W CN2013073680 W CN 2013073680W WO 2014161164 A1 WO2014161164 A1 WO 2014161164A1
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WO
WIPO (PCT)
Prior art keywords
base station
emergency help
signal
help signal
frequency
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2013/073680
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English (en)
Chinese (zh)
Inventor
张磊
王轶
徐月巧
周华
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Fujitsu Ltd
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Fujitsu Ltd
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Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to PCT/CN2013/073680 priority Critical patent/WO2014161164A1/fr
Publication of WO2014161164A1 publication Critical patent/WO2014161164A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]

Definitions

  • the present invention relates to the field of communications, and in particular, to a communication establishment method and apparatus in an emergency situation. Background technique
  • a communication establishment method in an emergency situation includes:
  • the user equipment When in an emergency, the user equipment (UE) generates an emergency help signal;
  • the UE If a downlink signal transmitted by the base station is detected, the UE communicates with the base station.
  • a communication establishment method in an emergency situation includes:
  • the user equipment When in an emergency, the user equipment (UE) generates an emergency help signal;
  • the UE establishes device-to-device (D2D) communication with other UEs and maintains time synchronization; the UE passes the emergency help signal or information for indicating generation and transmission of the emergency help signal through the above D2D communication Sending the link to the other UE, so that the other UE sends the emergency help signal on the specified time-frequency resource together with the UE; Sending, by the UE, the emergency help signal on a specified time-frequency resource;
  • D2D device-to-device
  • the UE If a downlink signal transmitted by the base station is detected, the UE communicates with the base station.
  • a communication establishment method in an emergency situation includes:
  • the UE establishes D2D communication with the other UEs according to the control of other UEs and maintains time synchronization; the UE receives an emergency help signal sent by the other UE or information used to indicate the generation and transmission of the emergency help signal;
  • the UE sends the emergency help signal on the specified time-frequency resource according to the control of the other UE; if the downlink signal sent by the base station is detected, the UE communicates with the base station according to the control of the other UE .
  • a communication establishment method in an emergency situation includes:
  • the base station activated with the emergency communication function continuously detects the preset emergency help signal in at least a predetermined number of resource blocks in its bandwidth center in each window time;
  • the base station increases its transmit power by a predetermined step size and starts a timer
  • the base station continues to increase its transmit power by the step size, and resets the timing. Until the emergency help signal sent by the random access request from the UE is detected or reaches its maximum transmit power.
  • a user equipment includes: a generating unit that generates an emergency help signal when in an emergency situation;
  • a first sending unit configured to send the emergency help signal on a specified time-frequency resource
  • a communication unit that communicates with the base station when detecting a downlink signal sent by the base station.
  • a user equipment includes: a generating unit that generates an emergency help signal when in an emergency situation;
  • a second sending unit configured to send the emergency help signal or information for indicating generation and transmission of the emergency help signal to the other UE by using the link of the D2D communication, so that the other UE and the The UE sends the emergency help signal together on the specified time-frequency resource;
  • a first sending unit configured to send the emergency help signal on a specified time-frequency resource
  • a communication unit that communicates with the base station when detecting a downlink signal sent by the base station.
  • a user equipment includes: an establishing unit, which establishes D2D communication with the other UE according to control of other UEs and maintains time synchronization;
  • a receiving unit which receives an emergency help signal sent by the other UE or information used to indicate the generation and transmission of the emergency help signal
  • a first sending unit configured to send the emergency help signal on a specified time-frequency resource according to the control of the other UE
  • the communication unit when detecting the downlink signal sent by the base station, performs real-time communication with the base station according to the control of the other UE.
  • a base station includes: a detecting unit, after the base station activates an emergency communication function, continuously in each window time, at least in the a predetermined number of resource blocks in the bandwidth center of the base station, and a first processing unit for detecting a preset emergency help signal, wherein when the detecting unit detects the emergency help signal, the step is increased by a predetermined step Determining the transmit power of the base station, and starting a timer, if the emergency help signal sent by the UE in the random access request mode is not received within the time period of the timer, the processing unit continues in the step size The transmit power of the base station is increased, and the timer is reset until the detecting unit detects a response signal from the UE or a maximum transmit power reaching the base station.
  • a communication system includes the user equipment according to any one of the foregoing fifth to seventh aspects, and the base station according to the eighth aspect.
  • a computer readable program wherein when the program is executed in a terminal device, the program causes the computer to perform any of the aforementioned first to third aspects in the terminal device.
  • a storage medium storing a computer readable program, wherein the computer readable program causes the computer to perform the method of any of the foregoing first to third aspects in the device The method of establishing communication in an emergency.
  • a computer readable program wherein when the program is executed in a base station, the program causes the computer to perform the emergency situation in the base station described in the foregoing fourth aspect Communication establishment method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the communication establishment method in an emergency situation according to the foregoing fourth aspect in a base station .
  • the beneficial effects of the embodiments of the present invention are as follows: The method and the device of the embodiments of the present invention enable the trapped person to contact the nearest base station in an emergency situation, thereby being rescued as soon as possible.
  • FIG. 1A is a flowchart of a communication establishment method in an emergency situation according to an embodiment of the present invention
  • 1B is a flowchart of a method for establishing a communication of a non-center user in an emergency
  • Figure 2 is a schematic diagram of the D2D connection mode in an emergency
  • FIG. 3 is a flow chart of a method for transmitting an emergency help signal according to a method for testing an FDD base station
  • FIG. 4 is a flow chart of another method for transmitting an emergency help signal according to a method for testing a FDD base station
  • FIG. 5 is a method for transmitting an emergency according to a method for testing a TDD base station. Flow chart of method for requesting a signal
  • FIG. 6 is a flowchart of a method for establishing a communication in an emergency situation according to another embodiment of the present invention
  • FIG. 7 is a schematic diagram showing the composition of three embodiments of a user equipment according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing the composition of a base station according to an embodiment of the present invention. detailed description
  • FIG. 1A is a flowchart of the method. Referring to FIG. 1A, the method includes:
  • Step 101 When in an emergency, the UE generates an emergency help signal
  • Step 102 The UE sends the emergency help signal on a specified time-frequency resource.
  • Step 103 If detecting a downlink signal sent by the base station, the UE communicates with the base station.
  • the emergency help signal may be sent in accordance with the method shown in FIG. 1 to try to contact the available base station. In this case, the user may not be sure if there are other users who are in the same situation.
  • the user can follow FIG. 1
  • D2D Device to Device
  • the UE User Equipment, user equipment, also referred to as user
  • the UE is known to have other UEs around, and it can establish a server (the UE serves as a central UE) to wait for other UEs to join, or join.
  • Another UE is established by the server; in another way, if the UE does not know whether there are other UEs around, it can enable the visible function in the D2D communication (that is, allow other UEs to detect themselves), and actively search for whether the surrounding area There are other UEs that establish D2D communication with surrounding UEs when searching for other UEs or being searched. Therefore, before step 102, the method further includes:
  • Step S1 The UE establishes D2D communication with other UEs and maintains time synchronization; Step S2: The UE uses the emergency help signal or is used to indicate the emergency help signal generation and The transmitted information is sent to the other UE through the link of the D2D communication, so that the other UE sends the emergency help signal on the specified time-frequency resource together with the UE.
  • one of the users can be selected as the center user to perform the above steps.
  • a user with a stronger terminal function can be selected as a central user, for example, a user with autonomous positioning function, which helps the base station to find the user as soon as possible, so as to rescue as soon as possible.
  • the central user can act as a server or controller to uniformly control and manage the other users, establish D2D connections with other users, and implement time synchronization.
  • the D2D connection may be the connection shown in FIG. 2 (with UE1 as the central user), and the specific connection manner may be a D2D connection method without base station assistance specified by the LTE (Long Term Evolution) standard, or may be Other D2D connection methods other than the LTE standard, such as Bluetooth, WiFi, etc., are not limited by this embodiment.
  • FIG. 1B is a flowchart of the communication establishment method of the non-center user in an emergency situation, please refer to FIG. 1B. , the method includes:
  • Step 201 The UE establishes D2D communication with the other UEs according to control of other UEs and maintains time synchronization.
  • Step 202 The UE receives an emergency help signal sent by the other UE or information used to generate and send the emergency help signal.
  • Step 203 The UE sends the emergency help signal on a specified time-frequency resource according to the control of the other UE.
  • Step 204 If detecting a downlink signal sent by the base station, the UE performs real-time communication with the base station according to the control of the other UE.
  • the central UE can control the non-central UE to send the same signal on the same time-frequency resource together with the D2D communication, that is, the above Emergency help signal. At this time, all UEs can transmit the above emergency request signal together at the appointed time.
  • the emergency help signal may be a preamble sequence (a preamble sequence for performing random access) of an LTE P ACH (Physical and Om Access Channel) channel.
  • the UE can directly specify the above
  • the preamble sequence is sent on the time-frequency resource; for a case where there are multiple UEs, the central UE may send the preamble sequence to other non-central UEs through the established D2D communication link; or may send the necessary parameters of the preamble sequence to other
  • the non-central UE may also send the indication information of the preamble to other non-central UEs when the standard has previously agreed on the preamble sequence (that is, the other non-central UEs have known the preamble sequence in advance), in this case, if The standard pre-arranges a plurality of preamble sequences for emergency assistance, and the central UE can send the sequence number of the preamble sequence to be sent to other non-central UEs.
  • the preamble sequence may be one or more, and is pre-agreed as an emergency help signal for emergency help. Considering that there is no downlink timing reference when transmitting the emergency help signal, it may cause serious timing errors, so in a preferred embodiment, this/these sequences are distinguished only by the root sequence number, instead of It is distinguished by the cyclic shift parameter N cs (N cs is defined with reference to TS 36.211 section 5.7.2 and Table 5.7.2-2).
  • the UE group may still It seems to be in the form of a UE (virtualized into one UE) to communicate with the base station in real time.
  • the central UE generates a message sent to the base station (which may be an emergency help signal transmitted by a random access request signal, or may be a subsequent signal). And transmitting the message to other non-central UEs.
  • the other non-central UEs perform physical layer processing on the message, such as coding and modulation, and then map the message to the specified time-frequency resource, and all UEs in the UE group. Sent at the agreed time.
  • the following describes the process of transmitting the emergency help signal to the UE and the process of the UE performing real-time communication with the base station after detecting the downlink signal sent by the base station.
  • the central UE transmits the emergency help signal as an example.
  • this embodiment is not limited thereto.
  • emergency help can be sent as follows. Signal, no longer repeat the description.
  • the UE may send the emergency help signal at a maximum transmit power on the specified time-frequency resource.
  • the base station since the UE increases its transmission power, it is more advantageous for the base station to detect the emergency help signal sent by the UE and rescue it.
  • both the central UE and the non-central UE transmit the emergency help signal with the maximum transmit power, as described above, because the UEs send the emergency help together at the agreed time on the same time-frequency resource.
  • Signal compared to only one UE In the case of a stronger signal, it is more advantageous for the base station to detect the emergency help signal for rescue.
  • the UE may send the emergency help signal in sequence according to a predetermined frequency sequence on a specified time-frequency resource.
  • the UE since the UE transmits the emergency help signal, there is no information about the base station. Therefore, the UE sequentially transmits the emergency help signal in a certain frequency order.
  • the order of selecting the frequency may be preset by the manufacturer or the operator in the UE (for example, a mobile phone). For example, a plurality of frequency points that are recently connected to the network may be stored in the mobile phone as the specified time-frequency resource, and then The emergency help signal is transmitted one by one in a step of 100 kHz in the bandwidth supported by the mobile phone.
  • the emergency help signal occupies a bandwidth of N RBs (Resource Blocks). For example, if the emergency help signal is transmitted as a P ACH signal, the bandwidth is 6 RBs.
  • one method is that the UE continuously transmits an emergency help signal such that the duration of the emergency help signal is greater than or equal to a prescribed window time. For example, if the window time is 10ms, the mobile phone sends the preamble in PRACH format 3, and the mobile phone continuously transmits 4 PRACH format 3 signals in 6 RBs with the current transmission frequency as the center frequency. For another example, the window time is 10ms, the mobile phone sends the preamble in PRACH format 2, and the mobile phone continuously transmits 6 PRACH format 2 signals in 6 RBs with the current transmission frequency as the center frequency.
  • another method is that the UE sends an emergency help signal at a certain interval each time, so that the base station can receive at least one complete emergency help signal in any window time after the initial transmission time of the UE.
  • the window time is T
  • the time domain duration of an emergency help signal is t1.
  • the UE continuously continues in steps of less than or equal to (T-2*tl) within 6 RBs with the current transmission frequency as the center frequency.
  • the window time is 10ms
  • the mobile phone sends the preamble in PRACH format 3
  • the mobile phone transmits the PRACH format 3 signal twice in 4 RBs with the current transmission frequency as the center frequency.
  • the window time is 10ms, the mobile phone sends the preamble in PRACH format 2, and the mobile phone transmits the PRACH format 2 signal twice in 6 RBs with the current transmission frequency as the center frequency.
  • the foregoing two implementation manners may also be used in combination.
  • the UE the case of one UE or the central UE or the non-central UE in the case of multiple UEs
  • sends an emergency help signal it may be specified.
  • the emergency help signal is sequentially transmitted on the time-frequency resource in order of the predetermined frequency order with the maximum transmission power.
  • the UE in the duplex mode transmits the emergency help signal according to the method of the pilot FDD base station; if the UE is a UE that only supports the TDD (Time Division Duplexing) mode, it follows the method of testing the TDD base station.
  • the emergency help signal is sent; if the UE is a dual mode UE, the heuristics of the two modes can be performed, and the order of the probes may depend on the operator of the UE, or the system of the network in which the UE last remains connected.
  • the emergency help signal is transmitted according to the method of testing the FDD base station and the emergency help signal is sent according to the method of the TDD base station.
  • the specified time-frequency resource is taken as the preset frequency group.
  • FIG. 3 is a flow chart of a method for transmitting an emergency help signal according to the method of testing FDD. Referring to FIG. 3, the method includes:
  • Step 301 The UE sends the emergency help signal to each uplink frequency point in the preset frequency group according to a predetermined frequency sequence.
  • Step 302 The UE detects a downlink signal on a downlink frequency point corresponding to an uplink frequency point in the preset frequency group.
  • Step 303 After traversing all the downlink frequency points, if no downlink signal is detected within the preset timer time, the transmission continues in the preset frequency group or other frequency group.
  • the emergency help signal After traversing all the downlink frequency points, if no downlink signal is detected within the preset timer time, the transmission continues in the preset frequency group or other frequency group.
  • the emergency help signal After traversing all the downlink frequency points, if no downlink signal is detected within the preset timer time, the transmission continues in the preset frequency group or other frequency group.
  • the emergency help signal After traversing all the downlink frequency points, if no downlink signal is detected within the preset timer time, the transmission continues in the preset frequency group or other frequency group. The emergency help signal.
  • the emergency help signal is transmitted in step 301 or the emergency help signal is transmitted in step 303, it may be transmitted continuously or at regular intervals. Further, whether it is transmitted continuously or at regular intervals, it can be transmitted at the maximum transmission power. Specifically, as described above, it will not be described here.
  • the UE may continuously send an emergency help signal according to the above method in each of the uplink frequency points in a certain set of uplink frequency points in a preset order.
  • the central UE detects the downlink signal at the downlink frequency point corresponding to the group of uplink frequency points according to the normal initial cell search method.
  • the central UE starts the timer. Before the timer stops, the UE does not send the uplink signal, but only the central UE follows the normal initial cell search method in the downlink corresponding to the group of uplink frequency points.
  • the frequency point detects the downlink signal. If the timer is stopped, the UE has not retrieved the downlink signal.
  • the UE may repeat the above steps within the set of frequency points, or repeat the above steps within the next set of frequency points.
  • a set of frequency points can be composed of commonly used frequency points of the UE or recently used frequency points.
  • Step 401 The UE sends the emergency help signal at each uplink frequency point in the preset frequency group according to a predetermined frequency sequence.
  • Step 402 After traversing all the uplink frequency points, the UE detects a downlink signal on a downlink frequency point corresponding to an uplink frequency point in the preset frequency group.
  • Step 403 If no downlink signal is detected within the preset time period of the timer, the emergency help signal is continuously transmitted in the preset frequency group or other frequency group.
  • the emergency help signal is transmitted in step 401 or the emergency help signal is transmitted in step 403, it may be transmitted continuously or at regular intervals. Further, whether it is transmitted continuously or at regular intervals, it can be transmitted at the maximum transmission power. Specifically, as described above, it will not be described here.
  • the UE may continuously send an emergency help signal according to the above method in each of the uplink frequency points in a certain set of uplink frequency points in a preset order.
  • the central UE starts the timer, and starts to detect the downlink signal at the downlink frequency point corresponding to the group of uplink frequency points according to the normal initial cell search method.
  • the UE no longer sends an upstream signal until the timer expires. If the timer is stopped, the UE has not retrieved the downlink signal.
  • the UE may repeat the above steps within the set of frequency points or repeat the above steps within the next set of frequency points.
  • a set of frequency points may be composed of UE common frequency points or recently used frequency points.
  • a set of frequency points can also be all available frequency points in a frequency band. Different from the example of Fig. 3, the timing of starting to detect the downlink signal is different.
  • FIG. 5 is a flowchart of a method for transmitting an emergency help signal according to a method for testing a TDD base station. Referring to FIG. 5, the method includes:
  • Step 501 The UE sends the emergency help signal at each frequency point in the preset frequency group according to a predetermined frequency sequence.
  • Step 502 After traversing all the frequency points, if the UE does not detect a downlink signal at a frequency point in the preset frequency group within a preset time period of the timer, The UE continues to send the emergency help signal in the preset frequency group or other frequency group.
  • the emergency help signal is transmitted in step 501 or the emergency help signal is transmitted in step 502, it may be transmitted continuously or at regular intervals. Further, whether it is transmitted continuously or at regular intervals, it can be transmitted at the maximum transmission power. Specifically as mentioned above, I will not repeat them here.
  • the UE may continuously transmit an emergency help signal at each frequency point in accordance with the above method in a predetermined frequency sequence in a predetermined order.
  • the central UE After the traversal of the preset frequency traversal is completed, the central UE starts a timer. Before the timer stops, only the central UE sequentially detects the downlink signal at the set of frequency points according to the usual initial cell search method. If the timer is stopped, the UE has not retrieved the downlink signal. The UE may repeat the above steps within the set of frequency points, or repeat the above steps within the next set of frequency points.
  • the FDD uplink and downlink frequencies are different. In this example, the TDD uplink and downlink frequencies are the same.
  • the base station continuously detects a predetermined emergency help signal sequence within at least one of its bandwidth centers within each window time.
  • the emergency help signal is sent in the form of a PRACH signal, and the window time is 10 ms. Then, every 10 ms, the base station uses the local emergency help signal sequence to detect the center 6 RB signals. Once the base station detects the emergency help signal, it will increase the transmit power by one step and then start the wait timer. If the timer is stopped, the base station has not received a response signal from the UE. Then, the base station further increases the transmission power by the above step, and restarts the waiting timer. This is repeated until the maximum transmit power of the base station is reached.
  • the base station needs to ensure that the maximum transmit power is reached, and does not exceed the waiting timer time of the UE.
  • the base station needs 10 steps from the current transmit power to the maximum transmit power
  • the processing on the base station side will be described in detail in the following embodiments.
  • the UE detects the downlink signal sent by the base station, and if the downlink signal sent by the base station is detected, performs real-time communication with the base station. .
  • the process of real-time communication with the base station is slightly different, which will be described in detail below.
  • the emergency help signal is sent as a random access preamble sequence to send a random access request.
  • the UE may send the random access request with the maximum transmit power.
  • the random access response RAR, Random Access Response
  • the UE calculates the message 3 according to the random access response. Transmitting the power, and transmitting the message 3 according to the calculated transmit power of the message 3.
  • the UE can report its own location or capability in the message 3, so that the base station calculates its location, when the UE receives its own ID. After message 4, it is confirmed that the base station is successfully accessed, whereby subsequent communication can be performed.
  • the central UE of the multiple UEs after detecting the downlink signal sent by the base station, the UE performs downlink signal synchronization with the base station, and at the first complete window time start position, in the system Within a predetermined number of RBs in the middle, the emergency access signal is transmitted as a preamble sequence with the emergency help signal. Similarly, the central UE can transmit the random access request with its maximum transmit power.
  • the central UE may further send synchronization control information and/or access control information to the other UE, so that the other UE performs downlink signal synchronization with the base station according to the synchronization control information, and/or, according to the
  • the access control information is sent to the first complete window time starting position, and the emergency access signal is used as a preamble sequence to send a random access request in a predetermined number of RBs in the middle of the system.
  • the non-central UE of the multiple UEs after detecting the downlink signal sent by the base station, the non-central UE of the multiple UEs performs downlink signal synchronization with the base station according to the synchronization control information sent by the received central UE; and/or, According to the received access control information, at the first complete window time start position, within the predetermined number of RBs in the middle of the system, the emergency access signal is sent as a preamble sequence to send a random access request. Similarly, the non-central UE can transmit the random access request with its maximum transmit power.
  • the downlink mobile phone After the downlink mobile phone detects the downlink signal, it will detect the broadcast information, such as cell ID, carrier frequency, bandwidth, frame structure type and/or uplink and downlink configuration (UL/DL).
  • the configuration is delivered to other mobile phones, and the timing information is sent or all mobile phones synchronize the downlink signals with the base station according to the above information (that is, all mobile phones and the base station are downlink synchronized).
  • all mobile phones are randomly accessed at the beginning of the first full window time, with 6 RBs in the middle of the system, with an emergency help signal (preamble sequence as described above).
  • the transmit power of the emergency help signal is still transmitted at the maximum transmit power of all mobile phones, rather than the power calculation method in the existing process.
  • the random access procedure is the same as the existing standard and will not be described here.
  • the base station after detecting the emergency help signal sent by the UE for performing emergency random access, the base station sends a random access response (RAR) to the UE, and according to the received random access response, the UE may Perform the appropriate processing.
  • RAR random access response
  • the UE calculates the transmit power of the message 3 according to the random access response; if the maximum transmit power of the UE is equal to the calculated transmit power of the message 3, The UE sends a message 3 according to its maximum transmit power; if the maximum transmit power of the UE is greater than the calculated transmit power of the message 3, the UE sends a message 3 according to the calculated transmit power; if the UE determines The sum of the maximum transmit powers of all the UEs in the D2D communication is equal to the calculated transmit power of the message 3, and the UE controls the other UEs to jointly send the message 3 with the respective maximum transmit power; If the sum of the maximum transmit powers of all the UEs in the D2D communication is greater than the calculated transmit power of the message 3, the UE controls the other UEs to jointly reduce the transmit power and jointly send the message, wherein the central UE can pass the foregoing
  • the established D2D communication link acquires information about the maximum transmit power of the other non-central
  • the UE requests the maximum transmit power of each non-central UE, and each non-central UE reports its maximum transmit power to the central UE according to the request of the central UE.
  • the manner of obtaining the maximum transmit power of each non-central UE is only an example, and the embodiment is not limited thereto.
  • the non-central UE may send the message 3 according to the control of the central UE, according to the indication of the central UE, keeping the transmission power unchanged or proportionally reducing its transmission power.
  • the central mobile phone calculates the required transmit power of the message 3 by referring to the TPC information carried in the uplink grant (UL grant) carried in the RAR. If the adjusted transmit power requirement can be met only by the maximum transmit power of one mobile phone, the subsequent process can be completed independently by the central mobile phone alone, and other mobile phones can access the downlink cell for normal communication according to the normal process; if only one The maximum transmit power of the mobile phone cannot meet the adjusted transmit power requirement, but the total power needs to be adjusted downward. Then the central mobile phone controls all mobile phones to reduce the transmit power proportionally, and completes the subsequent process together until the emergency communication ends. At the same time, the central mobile phone transmits the temporary cell radio network temporary identifier (Temporary C-R TI) and the UL grant carried in the RAR to other mobile phones, so that each mobile phone can send the same message at the specified time-frequency resource.
  • Temporal C-R TI Temporal C-R TI
  • the UE (the central UE or the non-central UE) can also report information about the measurement location, such as its location information or whether it has an autonomous positioning function, in the message 3, so that the base station can accurately estimate its location and thus better. Rescue.
  • the central UE acting as a server has autonomous positioning functions other than cellular networks, such as GPS (Global Positioning System, Global Positioning System). And the central UE has successfully autonomously locates before connecting to the cellular network, and directly reports its location information in the message 3. If the central UE as the server has an autonomous positioning function other than the cellular network, such as GPS, but cannot obtain its own location information before connecting to the cellular network, the capability can be reported in the message 3, so that the cellular can be utilized after the connection is successfully established. Auxiliary information provided by the network to help obtain location information and further escalation. If there is no mobile phone in the mobile phone group with autonomous positioning function outside the cellular network, the capability can be reported in message 3, indicating that there is no autonomous positioning capability.
  • GPS Global Positioning System, Global Positioning System
  • the base station sends a NACK signal after receiving the message 3, that is, the UE receives the NACK after transmitting the message 3. Then the UE retransmits the message 3.
  • the retransmission of the message 3 is consistent with the initial transmission method of the message 3, that is, it is completed by the central mobile phone or all the mobile phones are completed together, as described above, and details are not described herein again.
  • the UE if the UE receives the message 4 sent by the base station and confirms that the UE-ID included in the message 4 is its own, the UE (the central UE or the non-central UE) can confirm that the base station has successfully accessed. After the mobile phone successfully accesses the base station, subsequent communication can be performed.
  • the central UE when it is determined that the sum of the maximum transmit powers of all the UEs under D2D communication is greater than or equal to the calculated transmit power of the message 3, the central mobile phone monitors the PDCCH channel, and the corresponding DCI is performed after each uplink scheduling.
  • the information (Downlink Control Information, such as DCI Format 0 and/or DCI Format 3/3 A) and the information to be sent are sent to other mobile phones, so that each time the mobile phone can send the same information in the scheduled time-frequency resources, and When the uplink power control information is changed, the power is appropriately adjusted proportionally.
  • the step indicated by the power adjustment factor carried by the DCI information needs to be changed, for example, the existing TS36.213 table 5.1
  • the step factor in .1.1-2 is changed to a non-positive value, and the absolute value becomes larger.
  • the central UE may enable a counter to count the number of times that the maximum power of only one mobile phone can satisfy the required transmit power of the base station. After the counter reaches the maximum number of times, the subsequent communication can be completed by the central UE alone, and other non-central UEs can be controlled by the central UE or independently choose to continue the communication or exit the communication.
  • one UE or multiple UEs can establish communication with an available base station in an emergency situation, and strive for time and manner for successful rescue.
  • Example 2
  • the embodiment of the present invention further provides a communication establishment method in an emergency situation, which is a processing on the base station side corresponding to the method of Embodiment 1, wherein in Embodiment 1, a partial processing on the base station side has been described.
  • a communication establishment method in an emergency situation which is a processing on the base station side corresponding to the method of Embodiment 1, wherein in Embodiment 1, a partial processing on the base station side has been described.
  • the same contents as those of the method of Embodiment 1 will not be repeatedly described.
  • 6 is a flow chart of the method of this embodiment. Referring to FIG. 6, the method includes:
  • Step 601 The base station that activates the emergency communication function continuously detects the preset emergency help signal in a predetermined number of resource blocks of the bandwidth center in each window time.
  • the base stations of the sea, forest, Gobi, desert, and mountainous areas may be activated by emergency communication functions, or, after an emergency, such as earthquakes, tsunamis, floods, etc., the still available base stations may be activated by the emergency communication function.
  • the UE may transmit the emergency help signal according to the method of Embodiment 1, and the base station activated with the emergency communication function may detect the preset emergency help signal.
  • Step 602 If the emergency help signal is detected, the base station increases its transmit power by a predetermined step size, and starts a timer;
  • an emergency help signal if an emergency help signal is detected, it indicates that the user in the trap is waiting for rescue. At this time, the base station increases the transmission power thereof to obtain contact with the user in the trap.
  • Step 603 If the emergency help signal sent by the UE in the random access request mode is not received within the time period of the timer, the base station continues to increase its transmit power by the step size, and The timer is set until a response signal from the UE is detected or its maximum transmit power is reached.
  • the base station may further Increase its transmit power until a response signal from the user is detected or its maximum transmit power is reached.
  • the time from the base station to increase its transmit power to reach its maximum transmit power is less than or equal to the waiting timer time of the UE, otherwise the UE may not detect the downlink signal of the base station.
  • the frequency of transmitting the emergency help signal is changed to make it more difficult to contact.
  • the base station may send a random access response to the UE.
  • the RAR contains a 1-bit hopping identifier (Hopping). Flag), 10-bit fixed size resource block assignment, 4-bit shortened modulation and coding scheme, 3-bit for scheduling PUSCH (Physical Uplink Shared Channel) TPC command for scheduled PUSCH, 1 bit uplink delay (UL delay, Uplink delay), and 1 bit CSI (Channel-State Information, Channel status indication) Request (CSI request).
  • the 3 bits of the TPC command for power control are used to adjust the transmission power of the message 3.
  • TS36.213, Table 6.2-1 For the specific adjustment method, refer to the following table (TS36.213, Table 6.2-1):
  • the step size of the power adjustment in the existing standard designed for ordinary mobile phone users may not be applicable to the handset in an emergency situation.
  • the step size needs to be adjusted. Since the mobile phone sends the emergency help signal with the maximum transmit power, the power adjustment here only needs to be adjusted in the direction of power reduction, so the values in the table are all non-positive values. In addition, considering the emergency, the mobile phone is far away from the base station, and the farthest distance may reach 100 km (the maximum cell radius of the LTE (Long Term Evolution) standard design), so the power adjustment step size is larger than the existing step size. .
  • the random access response may include power adjustment indication information, where the step indicated by the power adjustment indication information is greater than a step size of an existing standard, and both are negative values, for example,
  • the above form is changed to the following form: TPC command value
  • the random access response may include fixed size resource block allocation bits and power adjustment command bits.
  • the transmission method can adopt a simple and reliable method. Therefore, in this embodiment, the CSI request bits in the RAR, and/or the Hopping flag bits, and other bits except the fixed size resource block assignment can be used. Omitted, and the power adjustment command bit is increased, thereby increasing the possibility of the power adjustment factor and refining the power adjustment strength.
  • the base station calculates the location of the UE.
  • the base station may measure a Round Trip Time according to the emergency help signal sent by the UE, and then estimate the location of the UE according to the round trip time of the signal, or the UE obtained according to the round trip time and the measurement.
  • the Angel of Arrival estimates the location of the UE.
  • the base station may use the UTDOA algorithm to estimate the location of the UE by detecting the UE uplink signal arrival time difference.
  • the base station may measure a Round Trip Time according to the SS and/or DMRS and/or PUSCH signals sent by the UE, and then perform a round trip according to the signal.
  • the time is estimated by the location of the UE, or the location of the UE is estimated based on the round trip time of the signal and the Angel of Arrival of the UE uplink signal obtained by the measurement.
  • the base station can estimate the location information of the UE by itself and alarm at the same time.
  • a downlink signal is jointly transmitted by multiple base stations.
  • the existing downlink joint transmission is a joint transmission of user-specific (UE-specific) data after the UE has successfully accessed a certain cell.
  • the UE has not yet accessed the network, and two or more base stations are required to perform cell-specific transmission.
  • two or more base stations in common frequency In-band, a 6RB continuous resource is selected, and a virtual cell is virtualized for the emergency help UE in this resource. That is, all cells transmit the same PSS/SSS and CRS signals at the same location, so that the UE can use these signals to perform downlink synchronization with the virtual cell, and uplink access.
  • the base station may contact the UE in an emergency situation to rescue the trapped person as soon as possible.
  • the embodiment of the present invention further provides a user equipment, as described in Embodiment 3 below. Since the principle of the user equipment solving the problem is similar to the communication establishment method in the emergency situation of Embodiment 1, the specific implementation may refer to the specific implementation. The implementation of the method of Embodiment 1 will not be repeated.
  • the embodiment of the invention provides a user equipment.
  • 7-9 are schematic diagrams showing the composition of three embodiments of the user equipment.
  • the user equipment includes:
  • Generating unit 71 which generates an emergency help signal when in an emergency situation
  • a first sending unit 72 configured to send the emergency help signal on a specified time-frequency resource
  • the communication unit 73 when detecting the downlink signal transmitted by the base station, communicates with the base station.
  • the user equipment includes the generation unit 81, the first transmission unit 82, and the communication unit, which are respectively the same as the generation unit 71, the first transmission unit 72, and the communication unit 73 shown in FIG.
  • the communication unit which are respectively the same as the generation unit 71, the first transmission unit 72, and the communication unit 73 shown in FIG.
  • it also includes:
  • Establishing unit 84 which establishes D2D communication with other UEs;
  • a second sending unit 85 configured to send the emergency help signal or information for indicating generation and transmission of the emergency help signal to the other UE by using the link of the D2D communication, so that the other UE and the The UE transmits the emergency help signal on the designated time-frequency resource.
  • the user equipment includes:
  • An establishing unit 91 which establishes D2D communication with the other UE according to control of other UEs; the receiving unit 92 receives an emergency help signal sent by the other UE or is used to indicate generation and transmission of the emergency help signal Information;
  • a first sending unit 93 configured to send the emergency help signal on a specified time-frequency resource according to the control of the other UEs;
  • the communication unit 94 when detecting the downlink signal sent by the base station, according to the control and location of the other UE The base station performs real-time communication.
  • the user equipment shown in FIG. 9 can be used together with the user equipment shown in FIG. 8, and the user equipment shown in FIG. 8 is used as a central user to jointly transmit the emergency help signal on the specified time-frequency resource.
  • the first sending unit (72, 82, 93) may send the emergency help signal with the maximum transmit power on the specified time-frequency resource, or may further follow the predetermined frequency on the specified time-frequency resource.
  • the emergency help signal is sequentially transmitted in sequence.
  • the specified time-frequency resource may be a preset frequency point group.
  • the first sending unit (72, 82, 93) comprises: a first sending module (721, 821, 931) in the predetermined frequency order, in the preset Sending the emergency help signal to each of the uplink frequency points in the frequency group;
  • a first detecting module (722, 822, 932) detecting a downlink signal on a downlink frequency point corresponding to an uplink frequency point in the preset frequency group;
  • a second sending module (723, 823, 933) traversing and detecting all the downlink frequency points in the first detecting module (722, 822, 932), and not detecting in a preset timer time
  • the emergency help signal is continuously transmitted in the preset frequency group or other frequency group.
  • the first transmitting unit (72, 82, 93) comprises: a third transmitting module (724, 824, 934) in the predetermined frequency order, in the Sending the emergency help signal to each of the uplink frequency points in the preset frequency group;
  • the emergency help signal is continuously transmitted within the point group or other frequency group.
  • the first transmitting unit (72, 82, 93) comprises: a fifth sending module (727, 827, 937) in the predetermined frequency order, in the preset Sending the emergency help signal at each frequency point in the frequency group;
  • a sixth sending module (728, 828, 938) traversing all of the frequency points in the fifth sending module (727, 827, 937), and not in the timing time of the preset timer
  • the preset frequency point group When the downlink signal is detected on the inner frequency point, the emergency help signal is continuously transmitted in the preset frequency point group or other frequency point group.
  • the emergency help signal may be continuously transmitted, such that the duration of the emergency help signal is greater than or equal to a predetermined window time, or may be sent at a certain time interval, so that the base station sends the emergency for the first time in the UE. At least one complete emergency help signal can be received in any window time after the time of the help signal.
  • the preset frequency point group or other frequency point group may be composed of a common frequency point or a recently used frequency point of the UE, or may be composed of all available frequency points in one frequency band. This embodiment is not intended to be limiting.
  • the communication unit 73 may include:
  • a first synchronization module 731 wherein the downlink signal is synchronized with the base station by using the detected downlink signal; the first access module 732 is at a first complete window time start position, and is within a predetermined number of RBs in the middle of the system. Sending a random access request with the emergency help signal as a preamble sequence.
  • the communication unit 73 may further include:
  • a first calculating module 733 configured to calculate a transmit power of the message 3 according to the random access response when receiving the random access response
  • the first processing module 734 transmits the message 3 using the calculated transmit power of the message 3.
  • the first processing module 734 may report the location information of the user equipment in the message 3.
  • the message 3 may also report whether the user equipment has an autonomous positioning function.
  • the communication unit 83 may include:
  • a second synchronization module 831 which uses the detected downlink signal to perform downlink signal synchronization with the base station;
  • a second access module 832 which is at a first complete window time start position, within a predetermined number of RBs in the middle of the system Sending a random access request by using the emergency help signal as a preamble sequence;
  • a seventh sending module 833 which sends synchronization control information and/or access control information to the other UE, so that the other UE performs downlink signal synchronization with the base station according to the synchronization control information, and/or
  • the access control information is sent to the first complete window time starting position, and the emergency access signal is used as a preamble sequence to send a random access request in a predetermined number of RBs in the middle of the system.
  • the communication unit 83 may further include:
  • a second calculating module 834 when receiving the random access response, calculating, according to the random access response The transmit power of the interest 3;
  • a second processing module 835 when the maximum transmit power of the UE is equal to the calculated transmit power of the message 3, sending the message 3 according to the maximum transmit power thereof; the maximum transmit power of the UE is greater than the calculated message 3 Transmit power according to the calculated transmit power, and send a message 3 according to the calculated transmit power; when the UE determines that the sum of the maximum transmit powers of all UEs under the D2D communication is equal to the calculated transmit power of the message 3, control the other UEs to jointly Transmitting the message 3 with the respective maximum transmit power; when the UE determines that the sum of the maximum transmit powers of all the UEs under the D2D communication is greater than the calculated transmit power of the message 3, controlling the other UEs to jointly reduce the transmission Power and send message 3 together.
  • the second processing module 835 may report the location information of the user equipment in the message 3.
  • the message 3 may also report whether the user equipment has an autonomous positioning function.
  • the second processing module 835 may be at the user equipment. After successfully accessing the base station, after each uplink scheduling, the corresponding DCI information and the to-be-sent information are sent to the other UEs, so that all UEs can send the same information in the scheduled time-frequency resources every time, and When the uplink power control information is changed, the power is appropriately adjusted proportionally.
  • the communication unit 94 can include:
  • a receiving module 941 which receives synchronization control information and/or access control information sent by the other UE; a communication module 942, which performs downlink signal synchronization with the base station according to the synchronization control information; and/or, according to the The access control information, in the first full window time start position, sends the random access request as the preamble sequence with the emergency help signal in a predetermined number of RBs in the middle of the system.
  • the communication unit 94 may further include:
  • the third processing module 943 maintains the transmit power unchanged or proportionally reduces the transmit power and transmits the message 3 according to the control of other UEs.
  • the third processing module 943 may report the location information of the user equipment in the message 3, and may also report whether the user equipment has an autonomous positioning function in the message 3.
  • communication can be established with an available base station in an emergency, and time and manner are obtained for successful rescue.
  • the embodiment of the present invention further provides a base station, as described in Embodiment 4 below. Since the principle of solving the problem by the base station is similar to the communication establishment method in the emergency case of Embodiment 2, the specific implementation may refer to the actual implementation. The implementation of the method of the second embodiment will not be repeated.
  • FIG. 10 is a schematic diagram of the composition of the base station.
  • the base station includes:
  • the detecting unit 1001 after the base station activates the emergency communication function, continuously performs a preset emergency help signal in a predetermined number of resource blocks of the bandwidth center of the base station continuously in each window time. Detection
  • a first processing unit 1002 when the detecting unit 1001 detects the emergency help signal, increase the transmit power of the base station by a predetermined step, and start a timer if the time of the timer is Receiving the emergency help signal sent by the UE in the random access request manner, the first processing unit 1002 continues to increase the transmit power of the base station by the step size, and resets the timer until The detecting unit 1001 detects an emergency help signal transmitted by the random access request from the UE or a maximum transmit power that arrives at the base station.
  • the time from when the first processing unit 1002 increases the transmit power of the base station to when the maximum transmit power of the base station is reached is less than or equal to the waiting timer time of the UE.
  • the base station may further include:
  • the sending unit 1003 when the detecting unit 1001 detects the emergency help signal for performing random access, and sends a random access response to the UE, where the random access response includes
  • the power adjustment indication information includes or includes a fixed size resource block allocation bit and a power adjustment command bit.
  • the power adjustment indication information is used to indicate that the UE keeps the transmit power unchanged or decreases the transmit power.
  • the base station further includes:
  • a first measurement estimating unit 1004 when receiving the message 3 sent by the UE, and determining, according to the message 3, that the UE does not have an autonomous positioning function, measuring a round trip time according to an emergency help signal sent by the UE, Estimating the location of the UE according to the round trip time of the signal, or estimating the location of the UE according to the round trip time of the signal and the angle of arrival of the uplink signal of the UE obtained by the measurement.
  • the base station further includes:
  • the base station further includes:
  • a third measurement estimating unit 1006 when receiving the message 3 sent by the UE, and determining, according to the message 3, that the UE does not have an autonomous positioning function, according to the SRS and/or DMRS and/or DMRS sent by the UE
  • the PUSCH signal measures the round-trip time of the signal, estimates the position of the UE according to the round-trip time of the signal, or estimates the position of the UE according to the round-trip time of the signal and the angle of arrival of the uplink signal of the UE obtained by the measurement.
  • the base station may further include:
  • a second processing unit 1007 when the first processing unit 1002 increases the transmit power of the base station to a maximum and still does not receive the response signal from the UE, estimates the location of the UE, and simultaneously alarms; or
  • the third processing unit 1008 when the first processing unit 1002 increases the transmit power of the base station to a maximum and still does not receive the response signal from the UE, cooperates with other base stations to transmit the downlink signal in the same time-frequency resource. Cover the area where the UE is located by increasing the transmit power.
  • the UE in an emergency situation can be contacted, so as to rescue the trapped person as soon as possible.
  • the embodiment of the present invention further provides a communication system, where the communication system includes the user equipment described in Embodiment 3 and the base station described in Embodiment 4.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in the terminal device, the program causes the computer to execute the communication establishment method in the emergency case described in Embodiment 1 in the terminal device.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer in the device to perform the emergency communication establishment method described in Embodiment 1.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes the computer to execute the communication establishment method in the emergency case described in Embodiment 2 in the base station.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the communication establishment method in the emergency situation described in Embodiment 2 in the base station.
  • the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Public Health (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Conformément à des modes de réalisation, la présente invention concerne un procédé et un appareil pour établir une communication dans une situation d'urgence. Le procédé comprend les opérations suivantes : en cas de situation d'urgence, un équipement utilisateur (UE) génère un signal d'aide d'urgence; l'UE envoie le signal d'aide d'urgence sur une ressource temps-fréquence spécifiée; et si l'UE détecte un signal de liaison descendante envoyé par une station de base, l'UE communique avec la station de base. Au moyen du procédé et de l'appareil des modes de réalisation de la présente invention, une personne en détresse peut contacter une station de base la plus près dans le cas d'une situation d'urgence pour chercher un sauvetage dès que possible.
PCT/CN2013/073680 2013-04-03 2013-04-03 Procédé et appareil pour établir une communication dans une situation d'urgence Ceased WO2014161164A1 (fr)

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CN107135495A (zh) * 2016-02-26 2017-09-05 中兴通讯股份有限公司 紧急信号的传输方法及装置
CN113747549A (zh) * 2020-05-28 2021-12-03 中国电信股份有限公司 基站控制方法、装置、存储介质和通信系统
CN115643551A (zh) * 2021-07-19 2023-01-24 苹果公司 用于长距离设备到设备通信的功率高效同步
CN116074763A (zh) * 2022-11-11 2023-05-05 南京畅索软件科技有限公司 一种共享求助信息的方法、终端、服务器、基站及系统

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CN1798354A (zh) * 2004-12-21 2006-07-05 华为技术有限公司 一种实现信息传输的方法

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Publication number Priority date Publication date Assignee Title
CN107135495A (zh) * 2016-02-26 2017-09-05 中兴通讯股份有限公司 紧急信号的传输方法及装置
CN107135495B (zh) * 2016-02-26 2021-06-15 中兴通讯股份有限公司 紧急信号的传输方法及装置
CN113747549A (zh) * 2020-05-28 2021-12-03 中国电信股份有限公司 基站控制方法、装置、存储介质和通信系统
CN113747549B (zh) * 2020-05-28 2022-09-06 中国电信股份有限公司 基站控制方法、装置、存储介质和通信系统
CN115643551A (zh) * 2021-07-19 2023-01-24 苹果公司 用于长距离设备到设备通信的功率高效同步
CN116074763A (zh) * 2022-11-11 2023-05-05 南京畅索软件科技有限公司 一种共享求助信息的方法、终端、服务器、基站及系统

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