WO2014161164A1

WO2014161164A1 - Method and apparatus for establishing communication in emergency situation

Info

Publication number: WO2014161164A1
Application number: PCT/CN2013/073680
Authority: WO
Inventors: 张磊; 王轶; 徐月巧; 周华
Original assignee: 富士通株式会社
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2014-10-09

Abstract

Embodiments of the present invention provide a method and an apparatus for establishing communication in an emergency situation. The method comprises: when in an emergency situation, a UE generating an emergency help signal; the UE sending the emergency help signal on a specified time-frequency resource; and if the UE detects a downlink signal sent by a base station, the UE communicating with the base station. By means of the method and apparatus of the embodiments of the present invention, a stranded person can contact a nearest base station in the case of an emergency situation to seek rescue as soon as possible.

Description

Communication establishment method and device in an emergency situation

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

With the development of communication technologies and the popularity of mobile terminal products, the coverage of base stations is becoming wider and more dense. However, in some areas where base stations are not easy to set up, full coverage of communication is still not possible, and people entering these areas For example, some wild explorers who are in danger or lost will not be able to get in touch with the outside world. On the other hand, even in the coverage area of the base station, after some sudden dangers, such as after an earthquake or flood, the base station may be destroyed or powered off, which may result in some trapped people being unable to get in touch with the outside world. In similar circumstances, the trapped person needs urgent help, but there is no public mobile communication signal coverage in the area where it is located, which makes it difficult to rescue. Summary of the invention

It is an object of embodiments of the present invention to provide a communication establishment method and apparatus in an emergency situation, so that a trapped person may contact the nearest base station in an emergency.

According to a first aspect of the embodiments of the present invention, a communication establishment method in an emergency situation is provided, where the method includes:

When in an emergency, the user equipment (UE) generates an emergency help signal;

Sending, by the UE, the emergency help signal on a specified time-frequency resource;

If a downlink signal transmitted by the base station is detected, the UE communicates with the base station.

According to a second aspect of the embodiments of the present invention, a communication establishment method in an emergency situation is provided, where the method includes:

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;

According to a third aspect of the embodiments of the present invention, a communication establishment method in an emergency situation is provided, where the method 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 .

According to a fourth aspect of the embodiments of the present invention, a communication establishment method in an emergency situation is provided, where the method 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;

If the emergency help signal is detected, the base station increases its transmit power by a predetermined step size and starts 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 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.

According to a fifth aspect of the embodiments of the present invention, a user equipment is provided, where the 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;

And a communication unit that communicates with the base station when detecting a downlink signal sent by the base station.

According to a sixth aspect of the present invention, a user equipment is provided, where the user equipment includes: a generating unit that generates an emergency help signal when in an emergency situation;

Establishing a unit that establishes D2D communication with other UEs and maintains time synchronization;

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;

According to a seventh aspect of the embodiments of the present invention, a user equipment is provided, where the 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.

According to an eighth aspect of the present invention, a base station is provided, where the 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.

According to a ninth aspect of the present invention, a communication system is provided, wherein the 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.

According to still another aspect of the embodiments of the present invention, there is also provided 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 The method of establishing communication in an emergency situation as described in the aspect.

According to still another aspect of the present invention, there is provided 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. According to still another aspect of the embodiments of the present invention, there is also provided 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.

According to still another aspect of the present invention, 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.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which illustrate the manner in which the principles of the invention can be employed. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising" is used to mean the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components. DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. To facilitate the illustration and description of some parts of the invention, the corresponding parts in the drawings may be enlarged or reduced. The elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the In the drawing:

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;

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

The foregoing and other features of the embodiments of the invention will be apparent from the These embodiments are merely exemplary and are not limiting of the invention.

Example 1

Embodiments of the present invention provide a communication establishment method in an emergency situation. 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. In this embodiment, when the user needs assistance in an emergency situation and there is no downlink signal coverage, 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.

In another embodiment of the embodiment, if the user determines that there are other users who are in the same situation, or if a group of users encounters an emergency and needs assistance and no downlink signal coverage, then the user can follow FIG. 1 In addition to the method shown, in order to increase the possibility of contacting the available base stations, it is also possible to establish D2D (Device to Device) communication with other users and try with other users. The available base station gets in touch. In this case, the UE (User Equipment, user equipment, also referred to as user) 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.

In the present embodiment, if the distance between the users is sufficiently close, or the users are familiar with each other, one of the users can be selected as the center user to perform the above steps. Preferably, 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.

In the present embodiment, for the non-central user, the emergency help signal may be sent together with the central user according to the control of the central user. 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.

In this embodiment, after the central user establishes a D2D connection with the non-central user and maintains time synchronization, 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.

In this embodiment, 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. For the case of only one UE, in an emergency, 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.

In this embodiment, 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).

In this embodiment, after successfully obtaining the downlink signal sent by the base station, if there is only one UE, directly communicate with the base station; for a case where there are multiple UEs (also UE group), 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. For example, 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.

For the UE to send an emergency help signal:

In the following description, the central UE transmits the emergency help signal as an example. However, this embodiment is not limited thereto. For a case where there is only one UE, or a non-central UE, emergency help can be sent as follows. Signal, no longer repeat the description.

In an embodiment, the UE may send the emergency help signal at a maximum transmit power on the specified time-frequency resource. In the case of only one UE, 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. For the case of multiple UEs, 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.

In another embodiment, the UE may send the emergency help signal in sequence according to a predetermined frequency sequence on a specified time-frequency resource. Wherein, 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.

It is assumed that 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.

In this embodiment, 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.

In this embodiment, 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. For example, the window time is T, and 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. Send an emergency help signal twice. For example, the window time is 10ms, the mobile phone sends the preamble in PRACH format 3, and the mobile phone transmits the PRACH format 3 signal twice in 4 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 transmits the PRACH format 2 signal twice in 6 RBs with the current transmission frequency as the center frequency.

In this embodiment, the foregoing two implementation manners may also be used in combination. For example, when 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.

In this embodiment, if the UE supports only FDD (Frequency Division Duplexing) 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.

In the following description, 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. In the following description, the specified time-frequency resource is taken as the preset frequency group.

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.

In the example of Fig. 3, as described above, whether 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.

In the example of FIG. 3, 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. At the same time, 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. After the traversal of the preset frequency traversal is completed, 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. A set of frequency points can also be all available frequency points in a frequency band. 4 is a flow chart of another method for transmitting an emergency help signal according to a method for testing an FDD base station. Referring to FIG. 4, the method includes:

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.

In the example of Fig. 4, as described above, whether 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.

In the example of FIG. 4, 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. After the traversal of the preset frequency traversal is completed, 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.

In the example of FIG. 5, as described above, whether 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.

In the example of FIG. 5, 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. 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. Different from the examples in FIG. 3 and FIG. 4, in the examples of FIG. 3 and FIG. 4, the FDD uplink and downlink frequencies are different. In this example, the TDD uplink and downlink frequencies are the same.

In this embodiment, for a base station that activates the emergency help signal receiving function, the base station continuously detects a predetermined emergency help signal sequence within at least one of its bandwidth centers within each window time. For example, 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. For example, the waiting timer time on the UE side is T _UE = 120 s, the base station needs 10 steps from the current transmit power to the maximum transmit power, and the waiting timer time on the base station side satisfies T _BS <= T _UE /10=12 s. The processing on the base station side will be described in detail in the following embodiments.

In this embodiment, after the UE sends the emergency help signal according to the foregoing method, as described above, 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. .

For different UEs (in the case of only one UE, a central UE or a non-central UE in multiple UEs), the process of real-time communication with the base station is slightly different, which will be described in detail below.

For the UE to perform real-time communication with the base station after detecting the downlink signal sent by the base station:

If there is only one UE, 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, within a predetermined number of RBs in the middle of the system, The emergency help signal is sent as a random access preamble sequence to send a random access request. For example, the UE may send the random access request with the maximum transmit power. If the random access response (RAR, Random Access Response) sent by the base station is received, 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. Preferably, 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.

If there are multiple UEs, for 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. In addition, 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.

Corresponding to the central UE, 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.

For example, 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). Subsequently, controlled by the central mobile phone, 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. In addition, the random access procedure is the same as the existing standard and will not be described here.

In this embodiment, 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.

For the central UE, if a random access response is received, 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 UEs, for example, the non-central UE reports the maximum transmit power to the central UE, and, for example, the central UE sends the non-central to the central UE when needed. 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.

If the non-central UE receives the random access response, it can do nothing, wait for the indication of the UE, in order to save power, and report the detected random access response to the central UE to help the center UE improve the correct detection. Probability. If the control information sent by the central UE is received, 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.

For example, after receiving the RAR, 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.

In this embodiment, 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.

For example, if 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.

In this embodiment, if 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.

In this embodiment, 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.

If, according to the power control information from the base station, it is determined that the maximum transmit power of only one mobile phone cannot meet the adjusted transmit power requirement, after the successful access to the base station, all the uplink transmissions of subsequent communications require multiple mobile phones to simultaneously upload. . For example, for 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. In addition, since these UEs are all in an emergency, in order to better contact the base station, 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.

Through the method of this embodiment, 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. 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.

Among them, 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.

As described above, in the emergency situation, 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;

Wherein, 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.

If the response signal from the user is not received within the timeout period of the timer, it may be that the user in the trap is too far away from the local area, and the current transmit power cannot cover the area where the user is located, 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.

In this embodiment, as described above, 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.

In this embodiment, if the base station detects the emergency help signal sent by the UE in the random access request mode, the base station may send a random access response to the UE.

Different from the existing standards, in the existing standard, 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. For the specific adjustment method, refer to the following table (TS36.213, Table 6.2-1):

Since the handset in an emergency situation may be farther away from the base station, 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. In this case, 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. .

In an embodiment of the present embodiment, 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

(TPC Command) (Value (in dB))

0 -140

1 - 120

2 -100

3 -80

4 -60

5 -40

6 -20

7 0

In another embodiment of this embodiment, the random access response may include fixed size resource block allocation bits and power adjustment command bits. Considering the emergency, 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.

In this embodiment, if the base station receives the message 3 sent by the UE, and determines that the UE does not have the autonomous positioning function according to the message 3, the base station calculates the location of the UE.

In an embodiment, 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.

In another embodiment, if there are two or more base stations capable of detecting the uplink signal 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.

In another embodiment, after the UE establishes a connection with the network, 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.

In this embodiment, if the base station cannot cover the rescued UE even if the transmission power is increased to the maximum, the base station can estimate the location information of the UE by itself and alarm at the same time. Or a downlink signal is jointly transmitted by multiple base stations. Wherein, if a plurality of base stations can receive the UE signal, the accuracy of the estimation of the direction of arrival of the UE by the base station can be improved.

The existing downlink joint transmission is a joint transmission of user-specific (UE-specific) data after the UE has successfully accessed a certain cell. Here, the UE has not yet accessed the network, and two or more base stations are required to perform cell-specific transmission. For example, 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.

With the method of this embodiment, after the emergency communication function is activated, 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.

Example 3

The embodiment of the invention provides a user equipment. 7-9 are schematic diagrams showing the composition of three embodiments of the user equipment.

Referring to FIG. 7, in this implementation manner, 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.

Referring to FIG. 8, in this embodiment, 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. In addition to 83, 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.

Referring to FIG. 9, in this implementation manner, 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.

In this embodiment, 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.

In this embodiment, the specified time-frequency resource may be a preset frequency point group.

In an embodiment of the first sending unit, 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 When the downlink signal is received, the emergency help signal is continuously transmitted in the preset frequency group or other frequency group.

In another embodiment of the first transmitting unit, 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;

a second detecting module (725, 825, 935), after the third sending module (724, 824, 934) traverses all the uplink frequency points, and the uplink frequency in the preset frequency group Detecting a downlink signal on a downlink frequency point corresponding to the point;

a fourth sending module (726, 826, 936), when the second detecting module (725, 825, 935) does not detect a downlink signal within a preset time period of the timer, at the preset frequency The emergency help signal is continuously transmitted within the point group or other frequency group.

In another embodiment of the first transmitting unit, 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.

In this embodiment, 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.

In this embodiment, 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.

In the embodiment of FIG. 7, 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.

In this embodiment, 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.

In this embodiment, 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.

In the embodiment of FIG. 8, 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.

In this embodiment, 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.

In this embodiment, 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.

In this embodiment, if the user equipment determines that the sum of the maximum transmit powers of all UEs under the D2D communication is greater than or equal to the calculated transmit power of the message 3, 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.

In the embodiment of FIG. 9, 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.

In this embodiment, 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.

In this embodiment, 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.

With the UE of this embodiment, 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.

Example 4

The embodiment of the invention provides a base station. FIG. 10 is a schematic diagram of the composition of the base station. Referring to FIG. 10, 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.

In this embodiment, 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.

In this embodiment, 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.

In an embodiment of this embodiment, 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.

In another implementation of this embodiment, the base station further includes:

a second measurement estimating unit 1005, when receiving the message 3 sent by the UE, and determining, according to the message 3, that the UE does not have the autonomous positioning function, using the UTDOA algorithm, estimating the UE by detecting the uplink signal arrival time difference of the UE. position. In another implementation of this embodiment, 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.

In this embodiment, 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.

With the base station of this embodiment, after the emergency communication function is activated, 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. The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention. A person skilled in the art can make various modifications and changes to the present invention within the scope of the present invention.

Claims

claims

1. A communication establishment method in emergency situations, wherein the method includes:

When in an emergency situation, the user equipment (UE) generates an emergency help signal;

The UE sends the emergency help signal on designated time-frequency resources;

If the downlink signal sent by the base station is detected, the UE communicates with the base station.

2. The method according to claim 1, wherein before the UE sends the emergency help signal on the designated time-frequency resource according to a predetermined policy, the method further includes:

The UE establishes device-to-device (D2D) communication with other UEs and maintains time synchronization; the UE transmits the emergency help signal or information indicating the generation and transmission of the emergency help signal through the above-mentioned D2D communication The link is sent to the other UE, so that the other UE and the UE send the emergency help signal on the designated time-frequency resource.

3. A communication establishment method in emergency situations, wherein the method includes:

The UE establishes D2D communication with the other UE according to the control of the other UE and maintains time synchronization; the UE receives the emergency help signal sent by the other UE or the information used to instruct the generation and transmission of the emergency help signal;

The UE sends the emergency help signal on the designated time-frequency resource according to the control of the other UE; if a downlink signal sent by the base station is detected, the UE communicates with the base station according to the control of the other UE. .

4. The method according to any one of claims 1 to 3, wherein: the UE transmits the emergency help signal with maximum transmit power on designated time-frequency resources; and/or the UE transmits the emergency help signal at the designated time and frequency resources. The emergency help signals are sent sequentially on frequency resources according to a predetermined frequency sequence.

5. The method according to claim 4, wherein the designated time-frequency resource is a preset frequency point group, then the UE sequentially sends the emergency help signal in a predetermined frequency sequence on the designated time-frequency resource. The steps include:

The UE sends the emergency help signal at each uplink frequency point in the preset frequency point group according to a predetermined frequency sequence;

The UE detects downlink signals on the downlink frequency points corresponding to the uplink frequency points in the preset frequency point group; after traversing all the downlink frequency points, if there is no detection within the preset timer time, to the next line signal, then continue to send the emergency help signal in the preset frequency point group or other frequency point groups.

6. The method according to claim 4, wherein the designated time-frequency resource is a preset frequency point group, then the UE sequentially sends the emergency help signal in a predetermined frequency sequence on the designated time-frequency resource. The steps include:

After traversing all the uplink frequency points, the UE detects downlink signals on the downlink frequency points corresponding to the uplink frequency points in the preset frequency point group;

If no downlink signal is detected within the preset timer, the emergency help signal continues to be sent within the preset frequency point group or other frequency point groups.

7. The method according to claim 4, wherein the designated time-frequency resource is a preset frequency point group, then the UE sequentially sends the emergency help signal in a predetermined frequency sequence on the designated time-frequency resource. The steps include:

The UE sends the emergency help signal at each frequency point in the preset frequency point group according to a predetermined frequency sequence;

After traversing all the frequency points, if the UE does not detect a downlink signal on the frequency point in the preset frequency point group within the preset timer, the UE will Continue to send the emergency help signal within the preset frequency point group or other frequency point groups.

8. The method according to any one of claims 5 to 7, wherein the UE continuously sends the emergency help signal so that the duration of the emergency help signal is greater than or equal to a prescribed window time; or, the UE sends the emergency help signal in a certain manner. The emergency help signal is sent at time intervals such that the base station can receive at least one complete emergency help signal within any window after the time when the UE first sends the emergency help signal.

9. The method according to any one of claims 5 to 7, wherein the preset frequency point group or the other frequency point group consists of the UE commonly used frequency points or recently used frequency points, or, the The preset frequency point group or the other frequency point group consists of all available frequency points within a frequency band.

10. The method according to claim 1, wherein if a downlink signal sent by a base station is detected, the step of the UE communicating with the base station includes:

The UE performs downlink signal synchronization with the base station, and uses the emergency help signal as a random access preamble within a predetermined number of resource blocks (RBs) in the middle of the system at the starting position of the first complete window time. (preamble) sequence to send a random access request.

11. The method according to claim 2, wherein if a downlink signal sent by a base station is detected, the step of the UE communicating in real time with the base station includes:

The UE performs downlink signal synchronization with the base station, and uses the emergency help signal as a preamble sequence to send a random access request within a predetermined number of RBs in the middle of the system at the starting position of the first complete window time;

The UE 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, according to the access control The information is at the starting position of the first complete window time and within a predetermined number of RBs in the middle of the system, using the emergency help signal as a preamble sequence to send a random access request.

12. The method according to claim 3, if a downlink signal sent by a base station is detected, the step of the UE communicating in real time with the base station according to the control of the other UE includes:

The UE receives synchronization control information and/or access control information sent by the other UE;

The UE performs downlink signal synchronization with the base station according to the synchronization control information; and/or, the UE performs a predetermined number of times in the middle of the system at the starting position of the first complete window time according to the access control information. Within the RB, a random access request is sent using the emergency help signal as a preamble sequence.

13. The method according to any one of claims 10-12, wherein the step of sending a random access request using the emergency help signal as a preamble sequence includes:

The UE sends the random access request with its maximum transmit power.

14. The method according to claim 10, wherein, after sending the random access request using the emergency help signal as a preamble sequence, the method further includes:

If a random access response is received, the UE calculates the transmission power of message 3 based on the random access response;

The UE sends the message 3 according to the calculated transmission power.

15. The method according to claim 11, wherein, after sending the random access request using the emergency help signal as a preamble sequence, the method further includes:

If the maximum transmission power of the UE is equal to the calculated transmission power of message 3, then the UE is based on Its maximum transmit power sends message 3;

If the maximum transmission power of the UE is greater than the calculated transmission power of message 3, then the UE sends message 3 according to the calculated transmission power;

If 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 message 3, then the UE controls the other UEs to jointly send message 3 with their respective maximum transmit powers;

If the UE determines that the sum of the maximum transmit powers of all UEs under the D2D communication is greater than the calculated transmit power of message 3, then the UE controls the other UEs to jointly reduce the transmit power in proportion and jointly send message 3.

16. The method according to claim 12, wherein, after sending the random access request using the emergency help signal as a preamble sequence, the method further includes:

If a random access response is received, the UE keeps the transmit power unchanged or reduces the transmit power proportionally and sends message 3 according to the control of the other UE.

17. The method according to any one of claims 14-16, wherein the step of the UE sending message 3 includes:

The UE reports its location information in the message 3, or the UE reports whether it has an autonomous positioning function in the message 3.

18. The method according to claim 15, wherein if the UE determines that the sum of the maximum transmission powers of all UEs under the D2D communication is greater than or equal to the calculated transmission power of message 3, the method further includes :

After the UE successfully accesses the base station, after each uplink scheduling, the corresponding downlink control information (DCI information) and the information to be sent are sent to the other UEs, so that all UEs can be scheduled each time. The same information is sent using time-frequency resources, and the power is appropriately adjusted proportionally when the uplink power control information changes.

19. A communication establishment method in emergency situations, wherein the method includes:

The base station with the emergency communication function activated continuously detects the preset emergency help signal within each window time, at least within a predetermined number of resource blocks in its bandwidth center;

If the emergency help signal is detected, the base station increases its transmit power in a predetermined step size and starts a timer;

If no random access request is received from the UE within the timer period, emergency help signal, the base station continues to increase its transmit power in the step size and resets the timer until an emergency help signal sent in the form of a random access request from the UE is detected or reaches its Maximum transmit power.

20. The method according to claim 19, wherein the time from when the base station increases its transmission power to when it reaches its maximum transmission power is less than or equal to the waiting timer time of the UE.

21. The method according to claim 19, wherein if the base station detects the emergency help signal sent by the UE for random access, the method further includes:

The base station sends a random access response to the UE, where the random access response includes power adjustment indication information, or includes fixed-size resource block allocation bits and power adjustment command bits.

22. The method according to claim 19, wherein if the base station does not receive a response signal from the UE when the transmission power reaches the maximum, the method further includes:

The base station estimates the location of the UE and alarms at the same time; or

The base station cooperates with other base stations to send downlink signals using the same time-frequency resources to increase the transmission power to cover the area where the UE is located.

23. A user equipment, wherein the user equipment includes:

A generating unit that generates an emergency help signal when in an emergency;

A first sending unit that sends the emergency help signal on designated time-frequency resources;

A communication unit that communicates with the base station when detecting the downlink signal sent by the base station.

24. The user equipment according to claim 23, wherein the user equipment further includes:

Establishing unit, which establishes D2D communication with other UEs and maintains time synchronization;

A second sending unit that sends the emergency help signal or information indicating the generation and transmission of the emergency help signal to the other UE through the above-mentioned D2D communication link, so that the other UE communicates with the UE Together, the emergency help signal is sent on designated time-frequency resources.

25. A user equipment, wherein the user equipment includes:

An establishment unit that establishes D2D communication with other UEs according to the control of other UEs and maintains time synchronization;

A receiving unit that receives the emergency help signal sent by the other UE or the information used to instruct the generation and transmission of the emergency help signal;

A first sending unit that sends the emergency request on designated time-frequency resources according to the control of the other UE. help signal;

26. The user equipment according to any one of claims 23 to 25, wherein, the first sending unit sends the emergency help signal with maximum transmit power on a designated time-frequency resource; and/or, the third A sending unit sequentially sends the emergency help signal in a predetermined frequency sequence on designated time-frequency resources.

27. The user equipment according to claim 26, wherein the designated time-frequency resource is a preset frequency point group, then when the first sending unit transmits in sequence on the designated time-frequency resource according to a predetermined frequency sequence When sending the emergency help signal, the first sending unit includes:

A first sending module that sends the emergency help signal at each uplink frequency point in the preset frequency point group according to the predetermined frequency sequence;

A first detection module that detects downlink signals on the downlink frequency points corresponding to the uplink frequency points in the preset frequency point group;

The second sending module, when the first detection module traverses all the downlink frequency points and does not detect a downlink signal within the preset timer, within the preset frequency point group or The emergency help signal continues to be sent in other frequency point groups.

28. The user equipment according to claim 26, wherein the designated time-frequency resource is a preset frequency point group, then when the first sending unit transmits sequentially on the designated time-frequency resource according to a predetermined frequency sequence When sending the emergency help signal, the first sending unit includes:

A third sending module that sends the emergency help signal at each uplink frequency point in the preset frequency point group according to the predetermined frequency sequence;

The second detection module detects the downlink signal on the downlink frequency point corresponding to the uplink frequency point in the preset frequency point group after the third sending module traverses all the uplink frequency points;

The fourth sending module continues to send the emergency signal in the preset frequency point group or other frequency point groups when the second detection module does not detect the downlink signal within the preset timer. Signal for help.

29. The user equipment according to claim 26, wherein the designated time-frequency resource is a preset frequency point group, then when the first sending unit sequentially transmits on the designated time-frequency resource according to a predetermined frequency sequence When sending the emergency help signal, the first sending unit includes:

The fifth transmitting module transmits all frequency points at each frequency point in the preset frequency point group according to a predetermined frequency sequence. Described emergency help signal;

The sixth sending module, which traverses all the frequency points after the fifth sending module, and does not detect downlink on the frequency points in the preset frequency point group within the preset timer time When the signal is received, the emergency help signal is continued to be sent within the preset frequency point group or other frequency point groups.

30. The user equipment according to any one of claims 27 to 29, wherein the emergency help signal is sent continuously such that the duration of the emergency help signal is greater than or equal to a specified window time; or, the emergency help signal is It is sent at a certain time interval so that the base station can receive at least one complete emergency help signal within any window period after the moment when the UE first sends the emergency help signal.

31. The user equipment according to any one of claims 27 to 29, wherein the preset frequency point group or the other frequency point group consists of the UE commonly used frequency points or recently used frequency points, or, the The preset frequency point group or the other frequency point group consists of all available frequency points within a frequency band.

32. The user equipment according to claim 23, wherein the communication unit includes:

The first synchronization module uses the detected downlink signal to perform downlink signal synchronization with the base station; the first access module is at the starting position of the first complete window time, within a predetermined number of RBs in the middle of the system, with The emergency help signal is used as a preamble sequence to send a random access request.

33. The user equipment according to claim 24, wherein the communication unit includes:

The second synchronization module uses the detected downlink signal to synchronize the downlink signal with the base station; the second access module is at the starting position of the first complete window time and a predetermined number of points in the middle of the system.

Within the RB, use the emergency help signal as a preamble sequence to send a random access request;

A seventh sending module, which sends synchronization control information and/or access control information to the other UEs, so that the other UEs perform downlink signal synchronization with the base station according to the synchronization control information, and/or, according to the The access control information is at the starting position of the first complete window time and within a predetermined number of RBs in the middle of the system, using the emergency help signal as a preamble sequence to send a random access request.

34. The user equipment according to claim 25, wherein the communication unit includes:

A receiving module, which receives synchronization control information and/or access control information sent by the other UEs; a communication module, which performs downlink signal synchronization with the base station according to the synchronization control information; and/or, according to the access In the control information, at the starting position of the first complete window time, within a predetermined number of RBs in the middle of the system, a random access request is sent using the emergency help signal as a preamble sequence.

35. The user equipment according to claim 32, wherein the communication unit further includes: A first calculation module that, when receiving a random access response, calculates the transmit power of message 3 based on the random access response;

The first processing module sends the message 3 according to the calculated transmission power of the message 3.

36. The user equipment according to claim 33, wherein the communication unit further includes:

The second calculation module, when receiving the random access response, calculates the transmission power of message 3 based on the random access response;

The second processing module, when the maximum transmission power of the UE is equal to the calculated transmission power of message 3, sends message 3 according to the maximum transmission power of the UE; when the maximum transmission power of the UE is greater than the calculated transmission power of message 3 When transmitting power, send 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 message 3, control the other UEs to share Send message 3 with their respective maximum transmit power; when the UE determines that the sum of the maximum transmit powers of all UEs under the D2D communication is greater than the calculated transmit power of message 3, control the other UEs to jointly reduce transmission proportionally Power and send messages together3.

37. The user equipment according to claim 34, wherein the communication unit further includes:

The third processing module, when receiving the random access response, keeps the transmission power unchanged or reduces the transmission power proportionally according to the control of the other UE and sends message 3.

38. The user equipment according to any one of claims 35 to 37, wherein the message 3 contains the location information of the user equipment, or whether the user equipment has an autonomous positioning function.

39. The user equipment according to claim 36, wherein, when the UE determines that the sum of the maximum transmission powers of all UEs under the D2D communication is greater than or equal to the calculated transmission power of message 3, the second processing module At that time, after the user equipment successfully accesses the base station, the corresponding DCI information and the information to be sent are sent to the other UEs after each uplink scheduling, so that all UEs can be configured in the scheduled time and frequency each time. The resources send the same information, and the power is appropriately adjusted proportionally when the uplink power control information changes.

40. A base station, wherein the base station includes:

A detection unit that, after the base station activates the emergency communication function, continuously detects the preset emergency help signal within each window time, at least within a predetermined number of resource blocks in the bandwidth center of the base station. A first processing unit that, when the detection unit detects the emergency help signal, increases the transmission power of the base station with a predetermined step size and starts a timer. If no signal is received within the timer's timing, Arrival If an emergency help signal is sent from the UE in the form of a random access request, the processing unit continues to increase the transmit power of the base station by the step size and resets the timer until the detection unit detects The response signal from the above-mentioned UE or the maximum transmit power reaching the base station.

41. The base station according to claim 40, wherein the time from when the first processing unit increases the transmission power of the base station to reaching the maximum transmission power of the base station is less than or equal to the waiting timer time of the UE. .

42. The base station according to claim 40, wherein the base station further includes:

A sending unit that sends a random access response to the UE when the detection unit detects the emergency help signal sent by the UE for random access, wherein the random access response includes power adjustment. The indication information may include fixed-size resource block allocation bits and power adjustment command bits.

43. The base station according to claim 40, wherein the base station further includes:

The second processing unit is configured to estimate the position of the UE and alarm at the same time when the first processing unit increases the transmission power of the base station to the maximum but still does not receive a response signal from the UE; or

A third processing unit that, when the first processing unit increases the transmit power of the base station to the maximum and still does not receive a response signal from the UE, the base station cooperates with other base stations to transmit downlink signals using the same time-frequency resources. The signal covers the area where the UE is located with increased transmit power.

44. A communication system, wherein the communication system includes the user equipment according to any one of claims 23-39 and the base station according to any one of claims 40-43.

45. A computer-readable program, wherein when the program is executed in a terminal device, the program causes the computer to execute the emergency communication establishment method in any one of claims 1-18 in the terminal device.

46. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the emergency communication establishment method described in any one of claims 1-18 in the device.

47. A computer-readable program, wherein when the program is executed in a base station, the program causes the computer to execute the emergency communication establishment method in any one of claims 19-22 in the base station.

48. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the emergency communication establishment method described in any one of claims 19-22 in the base station.