Cell switching control method and electronic equipment

Abstract

The invention relates to a cell switching control method and electronic equipment. The cell switching control method for V2V communication according to one embodiment comprises at least one of the following steps: adjusting the triggering time of a vehicle reporting a measurement report by using vehicle state information, the vehicle state information comprising a vehicle position and a driving direction, and shortening the triggering time under the condition that the driving direction is outward along the radial direction of a cell; combined judgment is carried out by combining switching conditions of a group of vehicles which are in V2V communication so as to improve judgment accuracy and judgment speed, and the group of vehicles comprise a sending vehicle and a receiving vehicle; and performing group switching on a group of vehicles performing V2V communication to reduce signaling overhead, the group of vehicles including a transmitting vehicle and a receiving vehicle.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 202110418691.7, filing date of April 19, 2021, and invention name “Electronic device, wireless communication method and cell switching control method”. The Chinese patent application No. 202110418691.7 is a divisional application of the Chinese patent application filed on November 5, 2015, with application number 201510746905.8 and invention name “Wireless communication device and wireless communication method”. Technical Field

[0002] The present disclosure generally relates to the field of wireless communications, and more particularly, to a wireless communication device and a wireless communication method. Background Art

[0003] In a wireless communication system, when a mobile station moves from one cell (referring to a base station or the coverage area of ​​a base station) to another cell, channel switching is required to maintain uninterrupted communication for mobile users. How to successfully and quickly complete cell switching is one of the important aspects of cellular cell system design in wireless communication systems.

[0004] ProSe direct communication in cellular networks, such as device-to-device (D2D) communication, generally refers to a service that can directly transmit user data between terminals without passing through the network. In particular, as a typical scenario for IoT applications, D2D communication can include vehicle-to-vehicle (V2V) communication, etc. The communication resources used by devices performing ProSe direct communication are allocated by the current serving cell base station, so ProSe direct communication also needs to consider cell switching issues. Summary of the invention

[0005] A brief summary of embodiments of the present invention is provided below to provide a basic understanding of certain aspects of the present invention. It should be understood that the following summary is not an exhaustive summary of the present invention. It is not intended to identify key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to provide certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] According to one embodiment, a wireless communication device for a user equipment side includes one or more processors, which are configured to: obtain information about the movement of the wireless communication device relative to its serving base station; adjust the triggering conditions for sending a measurement report for performing a cell switching based on the information; and control the sending of the measurement report according to the adjusted triggering conditions.

[0007] According to another embodiment, a wireless communication method for a user equipment side includes: obtaining information about the movement of the wireless communication device relative to its serving base station; adjusting the triggering conditions of the measurement report for performing the cell switching based on the information; and controlling the sending of the measurement report according to the adjusted triggering conditions.

[0008] According to another embodiment, a wireless communication device for a base station side includes one or more processors, and the processor is configured to: obtain a measurement report sent by a user equipment when a trigger condition is met, wherein the trigger condition is related to the movement of the user equipment relative to the base station; determine whether to perform a cell switching based on the measurement report; and generate a switching command for the user equipment when it is determined to perform a cell switching.

[0009] According to another embodiment, a wireless communication method for a base station side includes: obtaining a measurement report sent by a user equipment when a trigger condition is met, wherein the trigger condition is related to the movement of the user equipment relative to the base station; determining whether to perform a cell switching based on the measurement report; and generating a switching command for the user equipment when it is determined to perform a cell switching.

[0010] The embodiments of the present invention are helpful to improve the efficiency and / or accuracy of the cell switching process.

[0011] According to one aspect of the present disclosure, a cell switching control method for V2V communication is provided, including at least one of the following: adjusting a trigger time for a vehicle to report a measurement report using vehicle status information, the vehicle status information including a vehicle position and a driving direction, wherein the trigger time is shortened when the driving direction is outward along a radial direction of a cell; making a joint decision based on switching conditions of a group of vehicles performing V2V communication to improve decision accuracy and decision speed, the group of vehicles including a sending vehicle and a receiving vehicle; and performing group switching on a group of vehicles performing V2V communication to reduce signaling overhead, the group of vehicles including a sending vehicle and a receiving vehicle.

[0012] According to another aspect of the present disclosure, an electronic device on the first user equipment side of a wireless communication system is provided, including a circuit, configured to: perform cellular communication with a first base station while performing short-distance service direct communication with a second user equipment; measure a signal of the first base station and a signal of a second base station adjacent to the first base station; trigger an A3 event report when the measurement result meets the report triggering condition of the A3 event; receive an RRC reconfiguration message from the first base station containing a switching configuration for switching to the second base station; and after receiving the RRC reconfiguration message, perform the short-distance service direct communication with the second user equipment using time-frequency resources in a dedicated resource pool until a connection is successfully established with the second base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention may be better understood by referring to the following description given in conjunction with the accompanying drawings, wherein the same or similar reference numerals are used throughout the drawings to represent the same or similar components. The accompanying drawings, together with the following detailed description, are included in and form a part of this specification and are used to further illustrate the preferred embodiments of the present invention and to explain the principles and advantages of the present invention. In the drawings:

[0014] Figure 1 is a block diagram showing a configuration example of a wireless communication device for a user equipment side according to an embodiment of the present invention;

[0015] Figure 2 is a block diagram showing a configuration example of a wireless communication device for a user equipment side according to another embodiment;

[0016] Figure 3 is a flowchart showing an example of a process of a wireless communication method for a user equipment side according to an embodiment of the present invention;

[0017] Figure 4 is a block diagram showing a configuration example of a wireless communication device for a base station side according to one embodiment of the present invention;

[0018] Figure 5 is a block diagram showing a configuration example of a wireless communication device for a base station side according to another embodiment;

[0019] Figure 6 is a flowchart showing an example of a process of a wireless communication method for a base station side according to an embodiment of the present invention;

[0020] Figure 7 is a block diagram showing a configuration example of a wireless communication device for a user equipment side according to an embodiment of the present invention;

[0021] Figure 8 is a block diagram showing a configuration example of a wireless communication device for a base station side according to one embodiment of the present invention;

[0022] Fig. 9 is a block diagram showing an exemplary structure of a computer implementing the method and apparatus of the present disclosure;

[0023] Fig.10 is a block diagram showing an example of a schematic configuration of a smartphone to which the technology of the present disclosure can be applied;

[0024] Fig.11 is a block diagram showing an example of a schematic configuration of an eNB (evolved base station) to which the technology of the present disclosure can be applied;

[0025] Fig.12 is a block diagram of an example of a schematic configuration of a car navigation device to which the technology of the present disclosure can be applied;

[0026] Fig.13 is a schematic diagram for illustrating a V2V application scenario to which an embodiment of the present invention can be applied;

[0027] Fig.14 is a schematic diagram for explaining cell switching conditions;

[0028] Fig.15 is a schematic diagram for illustrating the movement of a vehicle relative to a serving cell base station;

[0029] Fig.16 is a schematic diagram for explaining adjustment of cell switching conditions;

[0030] Fig.17 is a flowchart for explaining an example of a process for determining a cell switching mode;

[0031] Fig.18 is a flowchart for explaining an example of a method for determining a cell switching; and

[0032] Fig.19 is a flow chart for illustrating an example process of cell switching. DETAILED DESCRIPTION

[0033] Embodiments of the present invention will be described below with reference to the accompanying drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that for the purpose of clarity, the representation and description of components and processes that are not related to the present invention and are known to those of ordinary skill in the art are omitted in the drawings and descriptions.

[0034] like Figure 1 As shown, the wireless communication device 100 according to this embodiment includes a processor 110. The processor 110 includes an acquisition unit 111, an adjustment unit 113, and a control unit 115. It should be noted that although the acquisition unit 111, the adjustment unit 113, and the control unit 115 are shown in the form of functional modules in the figure, it should be understood that the functions of the acquisition unit 111, the adjustment unit 113, and the control unit 115 can also be implemented by the processor 110 as a whole, and not necessarily by discrete actual components in the processor 110. In addition, although the processor 110 is shown as a box in the figure, the communication device 100 may include multiple processors, and the functions of the acquisition unit 111, the adjustment unit 113, and the control unit 115 can be distributed to multiple processors, so that the multiple processors cooperate to perform these functions.

[0035] According to one embodiment, the acquisition unit 111 is configured to acquire information about the movement of the wireless communication device 100 relative to its serving base station. The adjustment unit 113 is configured to adjust the triggering condition for sending the measurement report for performing the cell handover based on the information acquired by the acquisition unit 111. The control unit 115 is configured to control the sending of the measurement report according to the triggering condition adjusted by the adjustment unit 113.

[0036] Next, the corresponding processing performed by the acquisition unit 111, the adjustment unit 113 and the control unit 115 is described in conjunction with a specific embodiment.

[0037] The acquisition unit 111 may acquire information about the movement of the wireless communication device 100 relative to the base station in a variety of ways. In a certain embodiment, the acquisition unit 111 is configured to: acquire the location information of the serving base station and the location information of the wireless communication device 100, and determine the information about the movement of the wireless communication device 100 relative to the serving base station based on the acquired location information of the serving base station and the wireless communication device 100.

[0038] The acquisition unit 111 may obtain the location information of the base station according to the signaling from the base station. The acquisition unit may, for example, acquire the location information of the wireless communication device 100 through a global positioning system (GPS) device of the wireless communication device 100. The motion state of the wireless communication device 100 relative to the base station may be determined according to the location information. An example method of acquiring the motion information by the acquisition unit 111 will be described in more detail later in conjunction with specific embodiments.

[0039] In addition, according to an embodiment, the triggering condition for sending the measurement report for performing the cell handover to be adjusted by the adjustment unit 113 may include the length of the triggering time for triggering the sending of the measurement report.

[0040] Next, first refer to Fig.14 The measurement report used to perform cell switching and the triggering condition for sending the measurement report are briefly described.

[0041] The corresponding standards for handover measurement and decision defined in the LTE (Long Term Evolution) standard involve the following aspects:

[0042] Reference Signal Received Power (RSRP) is a key parameter that can represent the strength of wireless signals in LTE networks and one of the physical layer measurement requirements. It is the average value of the signal power received on all resource elements (REs) carrying reference signals within a symbol.

[0043] Handover Hysteresis Margin (HOM): This is the RSRP difference between the current serving cell and the adjacent cell. This value can be set according to different communication environments, and its size determines the length of the handover duration.

[0044] Trigger time (TTT, Time to Trigger): that is, a certain HOM condition must be continuously met during this period of time before a switching decision can be made. TTT can effectively prevent the occurrence of the "ping-pong effect" during switching.

[0045] The user equipment (UE) monitors the RSRP of all measured cells, and sends a measurement report to the eNB of the serving cell when the RSRP continuously satisfies the condition of the following formula (1) within a given TTT.

[0046] RSRP T -RSRP S ≥HOM continuous TTT ( / ms) Formula (1)

[0047] The UE may set the TTT parameter according to its movement speed (for example, see the contents related to SpeedStateScaleFactors in 3GPP (3rd Generation Partnership Project) TS36.331); RSRP T is the reference signal received power of the target cell; RSRP S is the reference signal received power of the serving cell.

[0048] After receiving the measurement report, the currently serving eNB starts preparing to hand over the UE to the new target cell (assuming that the target cell always has enough resources for the UE to be handed over). The preparation time can be modeled as a constant protocol delay, Fig.14 It is represented as P. After the preparation is completed, the serving cell sends a handover command message to the UE.

[0049] According to a specific embodiment, the information about the movement of the wireless communication device 100 relative to the serving base station obtained by the obtaining unit 111 may include the angle between the movement direction of the wireless communication device 100 and the radial direction of the wireless communication device 100 relative to the serving base station. The radial direction of the wireless communication device 100 relative to the serving base station refers to: the direction of a ray starting from the position of the serving base station and passing through the wireless communication device 100 (for example, Fig.15 In indicated direction).

[0050] More specifically, the acquisition unit 111 may be configured to acquire the motion information in the following manner: determine the radial direction according to the location information of the serving base station and the location information of the wireless communication device 100. The location information of the serving base station may be obtained according to the measurement control signaling from the serving base station. Alternatively, the location information of the serving base station may be obtained according to the system information block from the serving base station.

[0051] Refer to the following Fig.15 A specific example of the above-mentioned embodiment will be described.

[0052] exist Fig.15 In the example shown, the driving direction of the vehicle 1510 as an example of the user device is The radial direction of the cell of the vehicle 1510 with respect to its serving base station 1520 (i.e., the direction of the radius passing through the vehicle 1510 with the base station 1520 as the center) is and The angle between them is θ.

[0053] For example, the angle can be calculated according to the following formula (2):

[0054]

[0055] The radial direction of the cell of the vehicle 1510 relative to the base station 1520 is For example, it can be calculated by the following formula (3):

[0056]

[0057] Wherein, (v1, v2) is the coordinate of the vehicle 1510, and (e1, e2) is the coordinate of the eNB. The vehicle coordinates (v1, v2) are obtained, for example, by a GPS device of the vehicle, and the base station coordinates (e1, e2) are obtained, for example, by signaling from a base station.

[0058] As an example, the eNB coordinates (e1, e2) may be added to the RRC (Radio Resource Control) reconfiguration message (RRCConnectionReconfigurtion) (measurement control measConfig in) sent by the eNB. An example of the measurement control signaling format is shown in Table 1 below.

[0059] Table 1: Measurement control signaling format

[0060] eNB coordinates Measurement control

[0061] In addition, the eNB coordinates (e1, e2) may also be included in a system information block, such as MIB or SIB1.

[0062] In the above example, a vehicle is used as an example of a user device. Here, a V2V communication scenario, which is one of the application scenarios of an embodiment of the present invention, is briefly described. The communication resources used by the vehicle in V2V communication are allocated by the current serving cell eNB. When the vehicle drives to an adjacent cell, the communication resources are not authorized by the cell eNB, which may cause interference to other users in the cell. Therefore, V2V communication also needs to consider the switching problem. Fig.13 In the V2V communication scenario shown, many vehicles on the road perform V2V communication within the coverage of the cellular network. Considering the high-speed mobility of vehicles, vehicles can easily move from the current cell to the adjacent cell, so cell switching occurs frequently. In addition, compared with traditional cellular communications and other D2D communications, V2V communications (especially when road safety information is involved) have higher requirements on communication delay and information detection rate. Therefore, the solution of the embodiment of the present invention that helps to improve the efficiency and / or accuracy of the cell switching process is particularly meaningful for V2V application scenarios. However, it should be understood that the embodiments of the present invention are also applicable to wireless communication scenarios other than V2V, such as V2X, etc.

[0063] Continue to refer to Figure 1 An example configuration of a wireless communication device 100 according to an embodiment of the present invention is described. According to one embodiment, the adjustment unit 113 may be configured to adjust the trigger condition for sending the measurement report in the following manner: when the information about the movement of the wireless communication device 100 relative to the serving base station indicates that the movement direction of the wireless communication device 100 is away from the serving base station, shorten the trigger time. In the embodiment of the present invention, the adjustment of the trigger duration is based on the trigger duration set in a traditional or existing manner, that is, the adjustment may be an adjustment of the trigger duration that has been set in a traditional or existing manner.

[0064] More specifically, in a case where the acquisition unit 111 acquires the angle between the movement direction of the wireless communication device 100 and the radial direction of the cell of the wireless communication device 100 with respect to the serving base station as the movement information of the wireless communication device 100, the adjustment of the trigger condition by the adjustment unit 113 may include: in a case where the absolute value of the angle is less than a predetermined threshold, shortening the length of the trigger time for triggering the sending of the measurement report as the absolute value of the angle decreases, wherein the predetermined threshold is greater than 0° and less than or equal to 90°.

[0065] In addition, according to an embodiment, the adjustment unit 113 may be configured to make the trigger time not less than a predetermined lower limit value. The predetermined lower limit value may be determined according to conditions such as actual application scenarios and system configuration, and the predetermined lower limit value reflects the maximum tolerance limit of the occurrence of the ping-pong effect.

[0066] Next, an example manner in which the adjustment unit 113 adjusts the trigger condition for sending the measurement report is described. It should be understood that the embodiments of the present invention are not limited to the specific details of the following example.

[0067] According to an example implementation, the triggering time TTT for sending the measurement report may be adjusted according to the following equation (4).

[0068] TTT f =min(TTT*(a+sinθ),TTT)

[0069] Formula (4)

[0070] Among them, TTT f is the adjusted value of TTT, θ∈[0, 90°], to ensure TTT f is greater than 0, α is a constant greater than 0 and less than 1. Fig.16 As shown:

[0071] TTT f is a piecewise function, and the value of α determines TTT f The lower bound of α*TTT, TTT f The upper bound is TTT;

[0072] When θ∈(0, sin -1 (1-a)), TTTf is a strictly monotonically increasing function of θ; when θ∈(sin -1 (1-a),90°), TTTf is TTT.

[0073] For example, when α is TTT f The minimum value is When θ=45°TTT f The maximum value TTT is reached.

[0074] In another example, TTT can be determined according to the following formula (5): f

[0075] TTT f =a*TTT+(1-a)*sinθ*TTT, θ∈[0, 90°] Formula (5)

[0076] In this example, TTTf is between α*TTT and TTT, and TTTf is a strictly monotonically increasing function of θ in the range of θ∈[0, 90°].

[0077] The above describes an embodiment in which the motion direction is used as the motion information. However, in other embodiments, the trigger condition can also be adjusted based on other motion information. For example, according to one embodiment, the adjustment unit 113 can be configured to adjust the length of the trigger time based on the motion rate of the wireless communication device 100.

[0078] For example, TTT can be adjusted according to the function generally represented by the following equation (6):

[0079] TTT f =f(sf,θ,α,TTT),θ∈[0,90°] Formula (6)

[0080] Wherein sf is a speed factor, which is used to indicate whether the movement rate of the wireless communication device 100 is high speed, medium speed or low speed. The f function is an increasing function of θ, and the value range is [α*sf*TTT, sf*TTT]. θ can be regarded as a factor that determines how fast a vehicle leaves the cell of its service base station.

[0081] The parameter α in formula (6) can be included in the measConfig information element sent by the eNB. In the case of meeting a certain judgment accuracy (for example, the accuracy is above 80%, which can be defined according to specific system requirements), in order to make full use of the direction information, α can be set as small as possible, which is beneficial for the vehicle to reduce TTT and achieve fast switching. However, if α is set too small, it may result in too small TTT and lead to more frequent cell reselection. Those skilled in the art will understand that parameters such as α and the specific form of the function f can be appropriately set according to the specific application.

[0082] Through the above-mentioned embodiments of the present invention, the motion information of the user equipment, such as the vehicle position and driving direction, can be used to effectively shorten the triggering time of reporting the measurement report.

[0083] In addition, regarding the direction of movement, as described above, the direction of movement of the wireless communication device 100 may include the real-time direction of movement of the wireless communication device, the average direction of movement in a previous predetermined time period, or the estimated average direction of movement in a subsequent predetermined time period. More specifically, in a V2V scenario, the direction of movement of a vehicle may include, for example:

[0084] The real-time movement direction of the vehicle may include the instantaneous driving direction of the vehicle at the time of entering the A3 event (since the road extension direction is fixed in the traffic scene, the driving direction is also relatively stable);

[0085] The historical statistical direction of the vehicle over a period of time, such as the average driving direction of the vehicle within a predetermined time period before entering the A3 event (the average driving direction over a period of time may refer to the vector direction from the vehicle position at the start time to the vehicle position at the end time); or

[0086] For example, in an autonomous driving scenario, the navigation route indicates the average driving direction of the vehicle in the future.

[0087] The above describes an example implementation of adjusting the trigger condition by the adjustment unit 113. Accordingly, the control unit 115 can control the sending of the measurement report according to the trigger condition adjusted by the adjustment unit 113 in the following manner: when the difference between the reference signal received power of the serving base station and the target base station for performing the cell handover is continuously greater than a predetermined threshold within the adjusted trigger time, the measurement report is sent.

[0088] In addition, in addition to adjusting the length of the trigger time according to the motion information, the entry of the trigger event of the measurement report can also be controlled according to the motion information.

[0089] According to one embodiment, the control unit 115 may be configured to control entry and / or exit of a triggering event for performing a measurement report for cell switching based on information about the motion of the wireless communication device 100 relative to the serving base station.

[0090] For example, controlling the entry and / or exit of the trigger event based on the motion information may include: making the entry condition of the trigger event at least include the movement of the wireless communication device away from the serving base station; and / or exiting the trigger event when the movement direction of the wireless communication device approaches the serving base station. In addition, the entry condition may also include: the difference in reference signal received power between the serving base station and the target base station for performing cell switching is greater than a predetermined threshold.

[0091] Still refer to Fig.15 According to a specific embodiment, the control unit 115 may control the entry and exit of a trigger event (eg, an A3 event) according to the following conditions:

[0092] Enter the A3 event condition when the following conditions are met:

[0093] RSRP T -RSRP S ≥HOM and θ<90°

[0094] Exit A3 event condition when the following conditions are met:

[0095] RSRP T -RSRP S ≤HOM or θ>90°.

[0096] Among them, RSRP T is the reference signal received power of the target cell, RSRP S is the reference signal received power of the serving cell.

[0097] Next, refer to Figure 2 A wireless communication device according to another embodiment of the present invention is described. Figure 2 As shown, the wireless communication device 200 includes a processor 210 and a transceiver 220. The processor 210 includes an acquisition unit 211, an adjustment unit 213 and a control unit 215, and the configurations thereof are respectively similar to those of the reference Figure 1 The acquisition unit 111, adjustment unit 113 and control unit 115 described above are similar, and their detailed description is omitted here.

[0098] The transceiver 220 is configured to send a measurement report for performing cell switching to another wireless communication device that performs short range service direct communication with the wireless communication device 200 .

[0099] The wireless communication device according to this embodiment can be applied to a scenario where a joint handover is performed on wireless communication devices that perform short-range service direct communication.

[0100] More specifically, still taking the V2V application scenario as an example, since the close distance characteristics and driving actions of the two V2V communication parties are consistent, the eNB can regard the two communication parties as a whole to determine whether a cell switching is required. According to this embodiment, the wireless communication device 200 can provide its measurement report to another wireless communication device, and the other wireless communication device can provide their measurement reports together to the serving base station, so that the base station can make a joint decision on the cell switching of the two communication devices.

[0101] Accordingly, according to one embodiment, the transceiver 220 may also be configured to receive a measurement report for performing cell switching from one or more other wireless communication devices that perform short-range service direct communication with the wireless communication device 200. In this embodiment, the wireless communication device 200 may receive measurement reports from other wireless communication devices, and provide their measurement reports together with the wireless communication device 200's own measurement report to the serving base station, so that the base station makes a joint decision on the cell switching of these communication devices.

[0102] More specifically, the transceiver 220 may be configured to send the measurement reports of other wireless communication devices received within a predetermined time period together with the measurement report of the wireless communication device 200 to the serving base station.

[0103] Next, an example method of joint decision on cell switching is described in conjunction with a V2V application scenario.

[0104] First, consider the case where both parties in V2V communication are traveling in the same direction. The so-called same direction means that both parties in V2V communication are traveling in the same direction along the road. Since the close distance characteristics and driving actions of both parties in V2V communication are consistent, the eNB can treat the sender and receiver as a whole to determine whether switching is required.

[0105] Reference Fig.17 When the eNB receives a measurement report from another vehicle in V2V communication within a certain time τ (S1720) after receiving a measurement report from one of the two vehicles in V2V communication ("Yes" in S1710), the eNB makes a joint switching decision (S1750), which can reduce the probability of wrong switching judgment. When the second measurement report is not received within τ time ("No" in S1730), the eNB switches the vehicle that sent the first measurement report alone (S1740).

[0106] In the above example, the eNB receives measurement reports from both parties of the V2V communication respectively. However, the measurement reports of both parties of the communication may also be sent uniformly by one communication device as in the above embodiment. In this case, the communication device responsible for uniformly sending the measurement reports sends the two measurement reports to the eNB together when the measurement report of the V2V communication object is received within a predetermined time (corresponding to Fig.17 Otherwise, it sends its own measurement report (corresponding to S1750 in Fig.17 in S1740).

[0107] In addition, in the case of joint switching of wireless communication devices performing close range direct communication, the trigger conditions such as TTT and HOM can be further reduced while ensuring a certain switching judgment accuracy, and the adjustment of the trigger conditions can be determined by the relative speed and relative distance between the devices. In other words, according to some embodiments, the adjustment of the trigger conditions for sending the measurement report depends not only on the movement of the device relative to the base station, but also on the relative movement between the devices.

[0108] Accordingly, according to one embodiment, the acquisition unit 111 may also be configured to acquire information about the distance and / or relative speed between the wireless communication device 100 and another wireless communication device that performs short-range service direct communication with the wireless communication device 100. Furthermore, the adjustment unit 113 may also be configured to further adjust the triggering condition for sending the measurement report based on the distance and / or relative speed with the other wireless communication device.

[0109] More specifically, the adjusting unit 113 may be configured to reduce the triggering time for triggering the sending of the measurement report and / or the switching hysteresis difference as the distance between the wireless communication device 100 and another wireless communication device increases.

[0110] For example, the trigger time TTT and the handover hysteresis difference HOM for triggering the measurement report to be sent may be adjusted by the following equations (7) and (8) respectively.

[0111] TTT=β·TTT Formula (7)

[0112] H0M=β·HOM Formula (8)

[0113] Here, β is a constant greater than 0 and less than 1.

[0114] For example, β in equations (7) and (8) may be related to the distance between the sending and receiving vehicles. Taking the V2V application scenario as an example, in V2V communication, the sending vehicle periodically broadcasts V2V information. After receiving the V2V information, the receiving vehicle periodically sends an acknowledgment message (ACK), which is required to include the location information V of the receiving vehicle. R , send the vehicle according to its own location information V T and the received vehicle position information V in the confirmation message R Calculate the distance between vehicles The smaller the distance D between vehicles, the closer β is to 1, and the larger the distance D between vehicles, the smaller β is. β can be regarded as a quantity that measures the degree of coupling between the transmitting and receiving vehicles.

[0115] For example, let β = e -D / 100

[0116] When the distance D between vehicles is close to 0, β is close to 1, and HOM and TTT are almost unchanged; the larger the distance D between vehicles, the smaller β is, but after the V2V communication coverage range is about 100 meters, the value of β will not be too small. The sending vehicle can update the β value in the V2V information when sending V2V information in the next cycle.

[0117] In the above example, the case where the two communicating vehicles are moving in the same direction in the V2V scenario is considered. However, if the two communicating vehicles are traveling in opposite directions, there is no basis for the above joint judgment, so the sending and receiving vehicles should be judged and switched separately. The so-called opposite directions refer to the opposite extension directions of the two V2V communicating vehicles along the driving road.

[0118] Next, refer to Fig.18 An example method for determining a cell switching decision method based on the movement direction of two parties in a short-range direct communication service is described.

[0119] At S1810, determining whether the movement directions of two parties in the short-range service direct communication are the same;

[0120] If the movement directions are different, cell switching is performed by independent decision (S1820);

[0121] If the movement directions are the same, a joint decision method may be used to perform cell switching (S1830).

[0122] The selection of the judgment mode can be determined by the base station side according to the driving directions of the sender and the receiver. For example, the resource configuration information of the direct communication of the short-range service sent by the base station before the two parties start communicating indicates that the two parties use the joint judgment or independent judgment method. In addition, whether the driving directions are the same or opposite can be judged by, for example, the method measured by the base station.

[0123] In addition, when a joint decision method is used for cell switching, the user equipment may, for example, report a measurement report for cell switching in the following manner:

[0124] The user equipment performing the short-distance service direct communication reports the measurement report to the base station separately;

[0125] The user equipment performing the short-distance service direct communication sends a measurement report to one of the user equipments, and the user equipment collects the measurement reports of other user equipments received within a predetermined time, combines its own measurement report and reports it to the base station. If the measurement report of other user equipments is not received within the predetermined time, only its own measurement report will be reported, and the base station makes a switching decision based on the received single measurement report or combined measurement report; or

[0126] A method of coexistence of independent decision and joint decision can be adopted. For example, the base station can configure at least two TTT values ​​for the switching event, which are used for independent decision and joint decision respectively. The UE can, for example, perform measurement reports for the two TTT values ​​and corresponding processing respectively, and the base station makes a switching decision according to the report received first. Similarly, an embodiment of the present invention can also include, for example, configuring multiple TTTs (TTTs for independent decision and TTTs for joint decision) for the A3 event.

[0127] Through the above-mentioned embodiments of the present invention, by combining the user equipment of the near field service direct communication to perform a joint decision on the switching condition, the decision accuracy and decision speed can be improved.

[0128] An example method of joint decision for cell switching is described above. Next, an example method of performing cell switching according to an example embodiment of the present invention is described. In order to avoid signaling congestion caused by a large number of switching requests in a short period of time and to reduce signaling overhead, according to an embodiment of the present invention, user equipment performing short-range service direct communication can be grouped for cell switching.

[0129] For example, when cell switching is to be performed between two vehicles performing V2V communication, the target eNB can reserve two C-RNTIs (cell radio network temporary identifiers) and two random access preamble sequences, which are sent by the source eNB to one of the vehicles, which then informs the other vehicle and completes the group switching process.

[0130] Next, refer to Fig.19This example group switching process is described, and it should be understood that the embodiments of the present invention are not limited to the specific details of the following example.

[0131] In step S1: the source eNB notifies the vehicles TV and RV (TV and RV are vehicles performing V2V communication) of the measurement configuration message through the measConfig information element carried in the RRCConnectionReconfigurtion message, that is, sends down the measurement control, and the message includes the coordinate information of the source base station.

[0132] In step S2: TV and RV report a measurement report to the eNB. The measurement report includes, for example, a 1-bit transceiver indication bit and a 1-bit priority indication bit.

[0133] In step S3: the source eNB makes a joint decision.

[0134] In step S4: the source eNB sends a handover request to the target eNB, which includes the necessary information required by the target side to prepare for the handover, such as the target cell identifier, the C-RNTI of the sending vehicle and the receiving vehicle in the source cell included in the RRC context, etc.

[0135] If the target eNB can guarantee communication resources, admission control is performed in S5. The target eNB configures the required communication resources, reserves two C-RNTIs and two random access preamble sequences.

[0136] In step S6: the target eNB sends a handover request confirmation message to the source eNB. The message contains an RRC container, which contains a handover command that triggers the UE to perform a handover. The handover command contains two new C-RNTIs, two random access dedicated preamble codes, access parameters, system information, etc.

[0137] In step S7: the source eNB sends an RRCConnectionReconfigurtion message to the sending vehicle, including the RRC container and handover resource allocation information in the previous step.

[0138] In step S8: the TV informs the RV of the switching resource allocation information, the new C-RNTI and Preamble code, access parameters, system information, etc.

[0139] After S8, TV and RV can communicate using resources allocated in the switching resource pool (as will be described later).

[0140] In step S9: TV and RV initiate non-contention-based random access to the target cell.

[0141] After accessing the target cell, in step S10, the target eNB allocates new resources to the sending vehicle.

[0142] In step S11: the target eNB notifies the source eNB that the handover is successful, and notifies the source eNB that the handover resource pool resources can be released.

[0143] In step S12, the source eNB releases the handover resources and control plane related resources.

[0144] As mentioned above, the signaling overhead for cell switching can be effectively reduced through group switching.

[0145] Regarding the above-mentioned handover resource pool, it should be noted that since the handover interruption time is about 30ms, the life cycle of the above-mentioned resource pool resources can also be set to 50ms, and the source eNB will automatically release the handover resource pool resources after the timing ends. If there are no idle handover resources allocated to non-safety-related vehicles, the handover resource allocation information will not be included in S7, but it will still include new C-RNTI and Preamble information. In S8, the sending vehicle informs the receiving vehicle of the new C-RNTI and Preamble code, access parameters, system information, etc. Since no handover resources are allocated, there is a handover interruption after disconnecting from the source cell, but group handover can still be achieved.

[0146] Next, the configuration of switching resource pools is described in more detail.

[0147] LTE hard handover causes a period of interruption after the UE is disconnected from the source base station and before it establishes a connection with the target base station. To ensure the continuity of direct communication of short-range services during the handover process, according to an embodiment of the present invention, some time-frequency resources can be reserved to form a handover resource pool. Before disconnecting from the source base station, the sending vehicle will be allocated a time-frequency resource in the handover resource pool for end-to-end communication between vehicles until the vehicle is allocated new resources after establishing a connection with the target base station.

[0148] The configuration of the switching resource pool can follow the following principles:

[0149] The source cell and the destination cell share the same handover resource pool, ensuring that the use of the handover resource pool will not interfere with other users in the two cells;

[0150] The source and target cell base stations are aware of the use of the handover resource pool to prevent the same resource from being allocated repeatedly;

[0151] The resources in the handover resource pool can be reused by UEs located at the center of the cell to improve resource utilization.

[0152] In addition, for example, for V2V application scenarios, since the vehicles on both sides of the road travel in different directions, the switching resource pool can be divided into two parts:

[0153] The handover resources used by the vehicle switching from cell 1 to cell 2.

[0154] Handover resources used by vehicles switching from cell 2 to cell 1.

[0155] The traffic volume on both sides of the road is often different. Considering fairness, the relative number of the two parts of the time-frequency resources in the above switching resource pool should be dynamically adjusted according to the traffic volume on both sides of the road. For example, within T time, the number of vehicles switching from cell 1 to cell 2 is n, and the number of vehicles switching from cell 2 to cell 1 is m. The total number of time-frequency resources in the switching resource pool is N+M. Among them, N is the number of switching resources from cell 1 to cell 2, and M is the number of switching resources from cell 2 to cell 1. Then,

[0156]

[0157] In addition, for example, the resource pool configuration information may be updated every time T.

[0158] In addition, since there may be a large number of vehicles that need to switch and time-frequency resources are scarce, resource competition issues can be considered when allocating switching resources.

[0159] For example, V2V communications may be classified into safety-related and non-safety-related, and given high priority and low priority respectively.

[0160] Several blocks of dedicated time-frequency resources are reserved in the two parts of the switching resource pool respectively, which are used to allocate to safety-related vehicles when the remaining resources are exhausted. For the convenience of explanation, the dedicated time-frequency resources are called the first part and the remaining resources are called the second part.

[0161] Accordingly, the following resource allocation principles can be adopted:

[0162] Method 1: If there are remaining resources in the second part, the resources in the first part will not be allocated.

[0163] Method 2: When there are remaining resources in the second part, if multiple vehicles request to switch resources at the same time, resources are allocated to them in order of high and low priority.

[0164] Method 3: When there are no remaining resources in the second part:

[0165] a) When a high-priority vehicle requests handover resources, the eNB allocates the first part of resources to it.

[0166] b) At this time, if any resources are released, they should be immediately added to the first part to ensure the number of idle time-frequency resources in the original first part.

[0167] c) If a low priority vehicle requests a switching resource, it will not be allocated a switching resource, so there is a switching interruption.

[0168] The above example resource contention scheme is intended to ensure the needs of safety-related V2V communication vehicles when switching resources are tight.

[0169] Through the above handover resource pool configuration, during the cell handover process, handover resource pool resources are allocated to user equipment to ensure the continuity of its communication and dynamically adjust the resource pool configuration, and it can be ensured that high-priority users have priority in obtaining handover resource resources.

[0170] Next, an example method of joint decision and group switching of cell switching in a broadcast scenario is described. The same parts of the example method of user equipment cell switching in a broadcast scenario and the unicast scenario described above are not repeated, and only the following differences are described. In addition, the V2V application scenario is used as an example for description, but it should be understood that the embodiments of the present invention are also applicable to other wireless communication scenarios.

[0171] Regarding the division of groups, the joint decision in the broadcast scenario requires the source base station to have information about the vehicles performing V2V communication. Therefore, the vehicle identifier (such as C-RNTI) should be added to the V2V broadcast information sent by the vehicle. Once the receiving vehicle within the broadcast coverage demodulates the broadcast information and obtains the C-RNTI of the sending vehicle, it immediately sends a joining request to the eNB.

[0172] The eNB side may establish a broadcast group information table, as shown in Table 2 below, which records the C-RNTIs of the broadcasting vehicles and receiving vehicles in the broadcast group.

[0173] Table 2. Broadcast group member information table

[0174] member C-RNTI Send vehicle C-RNTI Receiving vehicle 1 C-RNTI1 Receiving vehicle 2 C-RNTI2

[0175] When the receiving vehicle loses the signal of the broadcasting vehicle, it sends a request to the eNB to exit, and the eNB deletes the information of the vehicle in the broadcast group member information table, so that the eNB can grasp the member information of the broadcast group in real time.

[0176] Example of joint decision: Assume that there are 7 vehicles in the group, including 1 sending vehicle and 6 receiving vehicles. For example, when the eNB receives measurement reports from the sending vehicle and more than half of the receiving vehicles, it can make a switching decision without waiting for all vehicles to report measurement reports, which can reduce the switching delay.

[0177] Example of group handover: After the source eNB makes a handover decision, it can send a handover request to the target eNB, including the broadcast group information table. The target eNB sends a handover request confirmation message to the source eNB. The specific content of the RRC container can include a handover command that triggers the UE to switch. The handover command contains multiple old C-RNTIs and new C-RNTIs, and also carries a random access dedicated Preamble code, access parameters, system information, etc., where the old C-RNTI and the new C-RNTI and Peamble correspond one to one. The source eNB sends an RRCConnectionReconfigurtion message to the sending vehicle, including the RRCcontainer and handover resource allocation information in the previous step. The sending vehicle broadcasts the receiving vehicle's handover resource allocation information, new C-RNTI and Preamble code, access parameters, system information, etc., and the receiving vehicle obtains the new C-RNTI and Preamble by comparing the old C-RNTI.

[0178] In the above description of the wireless communication device according to the embodiment of the present invention, some methods and processes are obviously disclosed. Next, without repeating the details described above, a description is given of the wireless communication method for the user equipment side according to the embodiment of the present invention.

[0179] like Figure 3 In the wireless communication method for user equipment side according to an embodiment of the present invention:

[0180] In step S310, information about the movement of the wireless communication device relative to its serving base station is obtained.

[0181] Next, in step S320, a triggering condition for a measurement report for performing a cell handover is adjusted based on the acquired information.

[0182] Next, in step S330, the sending of the measurement report is controlled according to the adjusted trigger condition.

[0183] The above describes embodiments of a wireless communication device and method for a user equipment side. Embodiments of the present invention also include a wireless communication device and method for a base station side.

[0184] like Figure 4 As shown, according to an embodiment of the present invention, a wireless communication device 400 for a base station side includes one or more processors 410 , and the processor 410 includes an acquiring unit 411 , a determining unit 413 , and a generating unit 415 .

[0185] The acquisition unit 411 is configured to acquire a measurement report sent by the user equipment when a trigger condition is met, wherein the trigger condition is related to a movement of the user equipment relative to the base station.

[0186] The determining unit 413 is configured to determine whether to perform cell handover of the user equipment based on the measurement report.

[0187] The generating unit 415 is configured to generate a handover command for the corresponding user equipment in the case of determining to perform cell handover.

[0188] The trigger condition is, for example, adjusted by the user equipment according to the movement of the user equipment relative to the base station, and the movement of the user equipment relative to the base station is, for example, determined by the user equipment according to the position of the base station. Accordingly, according to one embodiment, the wireless communication device for the base station side is configured to send the position information of the base station to the user equipment.

[0189] like Figure 5 As shown, the wireless communication device 500 for the base station side includes one or more processors 510, and a transceiver 520. The processor 510 includes an acquisition unit 511, a determination unit 513, and a generation unit 515, and its configuration is similar to the acquisition unit 411, the determination unit 413, and the generation unit 415 described above.

[0190] The transceiver 520 is configured to send information about the location of the base station to the user equipment.

[0191] According to an embodiment, the transceiver 520 is configured to send the location information of the base station via radio resource control signaling. For example, the transceiver 520 may notify the user equipment of the measurement configuration message via the measConfig information element carried in the RRCConnectionReconfigurtion message, which may include the location information of the base station.

[0192] In addition to including the location information of the base station in the measurement control signaling sent to the user equipment, the location information of the base station may also be included in a system information block (eg, MIB or SIB1) sent to the user equipment.

[0193] The user equipment may adjust the triggering condition of the measurement report based on the information from the base station, wherein the adjustment of the triggering condition may be related to the angle between the movement direction of the user equipment and the radial direction of the base station, wherein the radial direction may be determined according to the location information of the base station and the location information of the user equipment.

[0194] In addition, the wireless communication device used at the base station side according to the embodiment of the present invention can perform group switching on user equipment.

[0195] According to an embodiment, the wireless communication device may be configured to generate a common handover command for the first user equipment and the second user equipment when a measurement report from a second user equipment performing close range service direct communication with the first user equipment is received within a predetermined time period after receiving a measurement report for cell handover from the first user equipment. In this embodiment, the base station receives measurement reports from multiple user equipments respectively.

[0196] In addition, measurement reports of multiple user equipments may also be collected by one of the user equipments and sent together to the base station. According to another embodiment, the wireless communication device may be configured to generate a common switching command for the first user equipment and the at least one other user equipment based on the measurement reports of the first user equipment and at least one other user equipment performing short-range service direct communication with the first user equipment received from the first user equipment.

[0197] Next, refer to Figure 6 A wireless communication method used at a base station side according to an embodiment of the present invention is described.

[0198] At S610, a measurement report sent by a user equipment when a trigger condition is met is obtained, where the trigger condition is related to a movement of the user equipment relative to a base station.

[0199] Next, at S620, it is determined whether to perform cell switching based on the measurement report.

[0200] Next, at S630, in the case where it is determined to perform cell switching, a switching command for the user equipment is generated.

[0201] As an example, each step of the above method and each component module and / or unit of the above device can be implemented as software, firmware, hardware or a combination thereof. In the case of being implemented by software or firmware, it can be transmitted from a storage medium or a network to a computer (e.g., a computer) having a dedicated hardware structure. Fig. 9 The general-purpose computer 900 shown in the figure is installed with programs constituting software for implementing the above-mentioned method. When various programs are installed on the computer, it is possible to execute various functions, etc.

[0202] exist Fig. 9 In the embodiment, an operation processing unit (i.e., CPU) 901 performs various processes according to a program stored in a read-only memory (ROM) 902 or a program loaded from a storage section 908 to a random access memory (RAM) 903. In the RAM 903, data required when the CPU 901 performs various processes and the like is also stored as needed. The CPU 901, the ROM 902, and the RAM 903 are linked to each other via a bus 904. An input / output interface 905 is also linked to the bus 904.

[0203] The following components are linked to the input / output interface 905: an input section 906 (including a keyboard, a mouse, etc.), an output section 907 (including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.), a storage section 908 (including a hard disk, etc.), a communication section 909 (including a network interface card such as a LAN card, a modem, etc.). The communication section 909 performs communication processing via a network such as the Internet. A drive 910 may also be linked to the input / output interface 905 as needed. A removable medium 911 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is installed on the drive 910 as needed, so that a computer program read therefrom is installed in the storage section 908 as needed.

[0204] In the case where the above-described series of processing is realized by software, a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 911 .

[0205] It should be understood by those skilled in the art that such storage media is not limited to Fig. 9 The removable medium 911 shown has a program stored therein and is distributed separately from the device to provide the program to the user. Examples of the removable medium 911 include magnetic disks (including floppy disks (registered trademark)), optical disks (including compact disk read-only memory (CD-ROM) and digital versatile disks (DVD)), magneto-optical disks (including minidiscs (MD) (registered trademark)), and semiconductor memories. Alternatively, the storage medium may be a ROM 902, a hard disk included in the storage section 908, or the like, in which the program is stored and distributed to the user together with the device containing them.

[0206] The embodiment of the present invention further relates to a program product storing machine-readable instruction codes. When the instruction codes are read and executed by a machine, the method according to the embodiment of the present invention can be executed.

[0207] Accordingly, the storage medium for carrying the program product storing the machine-readable instruction code is also included in the disclosure of the present invention, including but not limited to a floppy disk, an optical disk, a magneto-optical disk, a memory card, a memory stick, and the like.

[0208] Embodiments of the present application also relate to the following electronic devices. In the case where the electronic device is used on the base station side, the electronic device can be implemented as any type of evolved Node B (eNB), such as a macro eNB and a small eNB. A small eNB can be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB, and a home (femto) eNB. Alternatively, the electronic device can be implemented as any other type of base station, such as a NodeB and a base transceiver station (BTS). The electronic device may include: a main body (also referred to as a base station device) configured to control wireless communications; and one or more remote radio heads (RRHs) arranged in a place different from the main body. In addition, the various types of terminals described below can all work as base stations by temporarily or semi-persistently performing base station functions.

[0209] When the electronic device is used on the user equipment side, it can be implemented as a mobile terminal (such as a smart phone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable / dongle-type mobile router, and a digital camera) or a vehicle-mounted terminal (such as a car navigation device). In addition, the electronic device can be a wireless communication module (such as an integrated circuit module including a single or multiple chips) installed on each of the above terminals.

[0210] [Application examples for terminal devices]

[0211] Fig.10 2 is a block diagram showing an example of a schematic configuration of a smartphone 2500 to which the technology of the present disclosure can be applied. The smartphone 2500 includes a processor 2501, a memory 2502, a storage device 2503, an external connection interface 2504, a camera 2506, a sensor 2507, a microphone 2508, an input device 2509, a display device 2510, a speaker 2511, a wireless communication interface 2512, one or more antenna switches 2515, one or more antennas 2516, a bus 2517, a battery 2518, and an auxiliary controller 2519.

[0212] The processor 2501 may be, for example, a CPU or a system on chip (SoC), and controls the functions of the application layer and other layers of the smartphone 2500. The memory 2502 includes a RAM and a ROM, and stores data and programs executed by the processor 2501. The storage device 2503 may include a storage medium such as a semiconductor memory and a hard disk. The external connection interface 2504 is an interface for connecting an external device (such as a memory card and a universal serial bus (USB) device) to the smartphone 2500.

[0213] The camera 2506 includes an image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and generates a captured image. The sensor 2507 may include a group of sensors such as a measurement sensor, a gyroscope sensor, a geomagnetic sensor, and an acceleration sensor. The microphone 2508 converts the sound input to the smart phone 2500 into an audio signal. The input device 2509 includes, for example, a touch sensor, a keypad, a keyboard, a button, or a switch configured to detect a touch on the screen of the display device 2510, and receives an operation or information input from a user. The display device 2510 includes a screen such as a liquid crystal display (LCD) and an organic light emitting diode (OLED) display, and displays an output image of the smart phone 2500. The speaker 2511 converts the audio signal output from the smart phone 2500 into sound.

[0214] The wireless communication interface 2512 supports any cellular communication scheme (such as LTE and LTE-Advanced), and performs wireless communication. The wireless communication interface 2512 may generally include, for example, a baseband (BB) processor 2513 and a radio frequency (RF) circuit 2514. The BB processor 2513 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and perform various types of signal processing for wireless communication. Meanwhile, the RF circuit 2514 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via an antenna 2516. The wireless communication interface 2512 may be a chip module on which the BB processor 2513 and the RF circuit 2514 are integrated. Fig.10 As shown, the wireless communication interface 2512 may include multiple BB processors 2513 and multiple RF circuits 2514. Fig.10 An example is shown in which the wireless communication interface 2512 includes a plurality of BB processors 2513 and a plurality of RF circuits 2514 , but the wireless communication interface 2512 may also include a single BB processor 2513 or a single RF circuit 2514 .

[0215] In addition, in addition to the cellular communication scheme, the wireless communication interface 2512 can support other types of wireless communication schemes, such as short-range wireless communication schemes, near field communication schemes, and wireless local area network (LAN) schemes. In this case, the wireless communication interface 2512 can include a BB processor 2513 and an RF circuit 2514 for each wireless communication scheme.

[0216] Each of the antenna switches 2515 switches a connection destination of the antenna 2516 between a plurality of circuits (eg, circuits for different wireless communication schemes) included in the wireless communication interface 2512 .

[0217] Each of the antennas 2516 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used for the wireless communication interface 2512 to transmit and receive wireless signals. Fig.10 As shown, the smart phone 2500 may include multiple antennas 2516. Fig.13 An example is shown in which the smart phone 2500 includes a plurality of antennas 2516 , but the smart phone 2500 may also include a single antenna 2516 .

[0218] In addition, the smartphone 2500 may include an antenna 2516 for each wireless communication scheme. In this case, the antenna switch 2515 may be omitted from the configuration of the smartphone 2500.

[0219] The bus 2517 connects the processor 2501, the memory 2502, the storage device 2503, the external connection interface 2504, the camera 2506, the sensor 2507, the microphone 2508, the input device 2509, the display device 2510, the speaker 2511, the wireless communication interface 2512, and the auxiliary controller 2519 to each other. The battery 2518 is fed to the Fig.13 The various blocks of the smartphone 2500 shown are supplied with power, the feed lines being partially shown as dashed lines in the figure. The auxiliary controller 2519 operates the minimum necessary functions of the smartphone 2500, for example in a sleep mode.

[0220] exist Fig.10 In the illustrated smart phone 2500, by using Figure 2 The transceiver 220 described may be implemented by the wireless communication interface 2512. Figure 1 and Figure 2 At least part of the functions of each unit described above may also be implemented by the processor 2501 or the auxiliary controller 2519. For example, the power consumption of the battery 2518 may be reduced by having the auxiliary controller 2519 execute part of the functions of the processor 2501. In addition, the processor 2501 or the auxiliary controller 2519 may execute the program stored in the memory 2502 or the storage device 2503 to perform the reference Figure 1 and Figure 2 At least part of the functionality of each unit is described.

[0221] [Application examples for base stations]

[0222] Fig.11 23 is a block diagram showing an example of a schematic configuration of an eNB to which the technology of the present disclosure can be applied. The eNB 2300 includes one or more antennas 2310 and a base station device 2320. The base station device 2320 and each antenna 2310 may be connected to each other via a radio frequency (RF) cable.

[0223] Each of the antennas 2310 includes a single or multiple antenna elements (such as multiple antenna elements included in a multiple-input multiple-output (MIMO) antenna) and is used for the base station device 2320 to transmit and receive wireless signals. Fig.11 As shown, the eNB 2300 may include multiple antennas 2310. For example, the multiple antennas 2310 may be compatible with multiple frequency bands used by the eNB 2300. Fig.11 An example is shown in which the eNB 2300 includes a plurality of antennas 2310 , but the eNB 2300 may also include a single antenna 2310 .

[0224] The base station device 2320 includes a controller 2321 , a memory 2322 , a network interface 2323 , and a wireless communication interface 2325 .

[0225] The controller 2321 may be, for example, a CPU or a DSP, and operates various functions of the higher layers of the base station device 2320. For example, the controller 2321 generates a data packet based on the data in the signal processed by the wireless communication interface 2325, and transmits the generated packet via the network interface 2323. The controller 2321 may bundle data from a plurality of baseband processors to generate a bundled packet, and transmit the generated bundled packet. The controller 2321 may have a logical function to perform the following control: the control may be such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. The control may be performed in conjunction with a nearby eNB or core network node. The memory 2322 includes a RAM and a ROM, and stores programs executed by the controller 2321 and various types of control data (such as a terminal list, transmission power data, and scheduling data).

[0226] The network interface 2323 is a communication interface for connecting the base station device 2320 to the core network 2324. The controller 2321 can communicate with the core network node or another eNB via the network interface 2323. In this case, the eNB 2300 and the core network node or other eNBs can be connected to each other through a logical interface (such as an S1 interface and an X2 interface). The network interface 2323 can also be a wired communication interface or a wireless communication interface for a wireless backhaul line. If the network interface 2323 is a wireless communication interface, the network interface 2323 can use a higher frequency band for wireless communication compared to the frequency band used by the wireless communication interface 2325.

[0227] The wireless communication interface 2325 supports any cellular communication scheme (such as long term evolution (LTE) and LTE-Advanced), and provides a wireless connection to a terminal located in a cell of the eNB 2300 via an antenna 2310. The wireless communication interface 2325 may generally include, for example, a BB processor 2326 and an RF circuit 2327. The BB processor 2326 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and perform various types of signal processing of layers (e.g., L1, medium access control (MAC), radio link control (RLC), and packet data convergence protocol (PDCP)). Instead of the controller 2321, the BB processor 2326 may have a part or all of the above-mentioned logical functions. The BB processor 2326 may be a memory storing a communication control program, or a module including a processor configured to execute a program and related circuits. Updating the program may change the function of the BB processor 2326. The module may be a card or a blade inserted into a slot of the base station device 2320. Alternatively, the module may also be a chip mounted on a card or a blade. Meanwhile, the RF circuit 2327 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via the antenna 2310 .

[0228] like Fig.11 As shown, the wireless communication interface 2325 may include multiple BB processors 2326. For example, the multiple BB processors 2326 may be compatible with multiple frequency bands used by the eNB 2300. Fig.11 As shown, the wireless communication interface 2325 may include multiple RF circuits 2327. For example, the multiple RF circuits 2327 may be compatible with multiple antenna elements. Fig.11 An example is shown in which the wireless communication interface 2325 includes a plurality of BB processors 2326 and a plurality of RF circuits 2327 , but the wireless communication interface 2325 may also include a single BB processor 2326 or a single RF circuit 2327 .

[0229] exist Fig.11 In the eNB 2300 shown, by using Figure 5 The transceiver 520 described may be implemented by the wireless communication interface 2325. Figure 4 and Figure 5 At least part of the functions of each unit described in the embodiment may also be performed by the controller 2321. For example, the controller 2321 may execute the program stored in the memory 2322 to perform the reference Figure 4 and Figure 5 At least part of the functionality of each unit is described.

[0230] [Application examples for car navigation devices]

[0231] Fig.1213 is a block diagram showing an example of a schematic configuration of a car navigation device 1320 to which the technology of the present disclosure can be applied. The car navigation device 1320 includes a processor 1321, a memory 1322, a global positioning system (GPS) module 1324, a sensor 1325, a data interface 1326, a content player 1327, a storage medium interface 1328, an input device 1329, a display device 1330, a speaker 1331, a wireless communication interface 1333, one or more antenna switches 1336, one or more antennas 1337, and a battery 1338.

[0232] The processor 1321 may be, for example, a CPU or a SoC, and controls a navigation function and other functions of the car navigation device 1320. The memory 1322 includes a RAM and a ROM, and stores data and a program executed by the processor 1321.

[0233] The GPS module 1324 measures the position (such as latitude, longitude and altitude) of the car navigation device 1320 using GPS signals received from GPS satellites. The sensor 1325 may include a group of sensors such as a gyro sensor, a geomagnetic sensor and an air pressure sensor. The data interface 1326 is connected to, for example, the vehicle network 1341 via a terminal not shown, and acquires data (such as vehicle speed data) generated by the vehicle.

[0234] The content player 1327 reproduces content stored in a storage medium such as a CD and a DVD, which is inserted into the storage medium interface 1328. The input device 1329 includes, for example, a touch sensor, a button, or a switch configured to detect a touch on the screen of the display device 1330, and receives an operation or information input from a user. The display device 1330 includes a screen such as an LCD or an OLED display, and displays an image of a navigation function or reproduced content. The speaker 1331 outputs a sound of a navigation function or reproduced content.

[0235] The wireless communication interface 1333 supports any cellular communication scheme (such as LTE and LTE-Advanced) and performs wireless communication. The wireless communication interface 1333 may generally include, for example, a BB processor 1334 and an RF circuit 1335. The BB processor 1334 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and perform various types of signal processing for wireless communication. Meanwhile, the RF circuit 1335 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via an antenna 1337. The wireless communication interface 1333 may also be a chip module on which the BB processor 1334 and the RF circuit 1335 are integrated. Fig.12 As shown, the wireless communication interface 1333 may include multiple BB processors 1334 and multiple RF circuits 1335. Fig.12 An example is shown in which the wireless communication interface 1333 includes a plurality of BB processors 1334 and a plurality of RF circuits 1335 , but the wireless communication interface 1333 may also include a single BB processor 1334 or a single RF circuit 1335 .

[0236] In addition, in addition to the cellular communication scheme, the wireless communication interface 1333 can support other types of wireless communication schemes, such as short-range wireless communication schemes, near field communication schemes, and wireless LAN schemes. In this case, for each wireless communication scheme, the wireless communication interface 1333 can include a BB processor 1334 and an RF circuit 1335.

[0237] Each of the antenna switches 1336 switches a connection destination of the antenna 1337 between a plurality of circuits (such as circuits for different wireless communication schemes) included in the wireless communication interface 1333 .

[0238] Each of the antennas 1337 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used for the wireless communication interface 1333 to transmit and receive wireless signals. Fig.12 As shown, the car navigation device 1320 may include multiple antennas 1337. Fig.13 An example is shown in which the car navigation device 1320 includes a plurality of antennas 1337 , but the car navigation device 1320 may also include a single antenna 1337 .

[0239] In addition, the car navigation device 1320 may include an antenna 1337 for each wireless communication scheme. In this case, the antenna switch 1336 may be omitted from the configuration of the car navigation device 1320.

[0240] Battery 1338 is fed via a feeder Fig.12 The respective blocks of the illustrated car navigation device 1320 are supplied with electric power, and feed lines are partially illustrated as dotted lines in the figure. The battery 1338 accumulates electric power supplied from the vehicle.

[0241] exist Fig.12 In the illustrated car navigation device 1320, by using Figure 2 The transceiver 220 described above may be implemented by the wireless communication interface 1333. The processor 1321 may execute the program stored in the memory 1322 to perform the reference Figure 1 and Figure 2 At least part of the functionality of each unit is described.

[0242] The technology of the present disclosure may also be implemented as an in-vehicle system (or vehicle) 1340 including one or more blocks of a car navigation device 1320, an in-vehicle network 1341, and a vehicle module 1342. The vehicle module 1342 generates vehicle data (such as vehicle speed, engine speed, and fault information), and outputs the generated data to the in-vehicle network 1341.

[0243] In the above description of specific embodiments of the present invention, features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or replace features in other embodiments.

[0244] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0245] In the above embodiments and examples, reference numerals are used to represent various steps and / or units. It should be understood by those skilled in the art that these reference numerals are only for the convenience of description and drawing, and do not represent the order or any other limitation.

[0246] In addition, the method of the present invention is not limited to being executed in the time sequence described in the specification, and may also be executed in other time sequences, in parallel or independently. Therefore, the execution order of the method described in this specification does not limit the technical scope of the present invention.

[0247] Although the present invention has been disclosed above by describing specific embodiments of the present invention, it should be understood that all the above embodiments and examples are exemplary rather than restrictive. Those skilled in the art may design various modifications, improvements or equivalents of the present invention within the spirit and scope of the appended claims. These modifications, improvements or equivalents should also be considered to be included in the protection scope of the present invention.

[0248] The present technology may also be configured as follows.

[0249] 1. An electronic device at a first user equipment side in a wireless communication system, comprising a circuit, configured to:

[0250] Performing cellular communication with the first base station and performing short-range service direct communication with the second user equipment at the same time;

[0251] measuring a signal of the first base station and a signal of a second base station adjacent to the first base station;

[0252] When the measurement result meets the reporting triggering condition of the A3 event, the A3 event report is triggered;

[0253] receiving an RRC reconfiguration message including a handover configuration regarding handover to the second base station from the first base station; and

[0254] After receiving the RRC reconfiguration message, the short distance service direct communication is performed with the second user equipment using the time and frequency resources in the dedicated resource pool until a connection is successfully established with the second base station.

[0255] 2. An electronic device according to 1, wherein the dedicated resource pool is composed of a portion of time-frequency resources specially reserved.

[0256] 3. The electronic device according to 1, wherein the dedicated resource pool is provided to the first user equipment by the first base station through an RRC reconfiguration message.

[0257] 4. The electronic device according to 1, wherein the source cell of the first base station and the target cell of the second base station share the same dedicated resource pool.

[0258] 5. The electronic device according to 1, wherein the resources in the dedicated resource pool are reused by user equipment located at a center of a cell.

[0259] 6. The electronic device according to 1, wherein the dedicated resource pool comprises two parts: a first part for direct communication of security-related short-range services and a second part as the remaining resources.

[0260] 7. The electronic device according to any one of 1-6, wherein the first user device and the second user device are vehicles and perform V2V communication.

[0261] 8. The electronic device according to 7, wherein the first user device and the second user device are considered as a group, and the circuit is configured to:

[0262] The RRC reconfiguration message received from the first base station is sent to the second user equipment.

[0263] 9. The electronic device according to 8, wherein the circuit is configured to report the information of the second user equipment to the first base station as the information of the V2V group member.

[0264] 10. An electronic device at a first base station side in a wireless communication system, comprising a circuit, configured to:

[0265] receiving an A3 event report from a first user equipment, including a signal measurement result of the first user equipment on the first base station and an adjacent second base station;

[0266] Based on the A3 event report, sending a handover request to the second base station and receiving a handover request confirmation from the second base station; and

[0267] An RRC reconfiguration message containing a switching configuration for switching to the second base station is sent to the first user equipment to trigger the first user equipment to use time and frequency resources in a dedicated resource pool to perform short-range direct communication with the second user equipment until the first user equipment successfully establishes a connection with the second base station.

[0268] 11. The electronic device according to 10, wherein the dedicated resource pool is composed of a portion of time-frequency resources specially reserved.

[0269] 12. The electronic device according to 10, wherein the dedicated resource pool is provided to the first user equipment by the first base station through an RRC reconfiguration message.

[0270] 13. The electronic device according to 10, wherein the source cell of the first base station and the target cell of the second base station share the same dedicated resource pool.

[0271] 14. The electronic device according to 10, wherein the resources in the dedicated resource pool are reused by user equipment located at a center of a cell.

[0272] 15. The electronic device according to 10, wherein the dedicated resource pool comprises two parts: a first part for security-related short-range service direct communication and a second part as the remaining resources.

[0273] 16. The electronic device according to any one of 10-15, wherein the first user device and the second user device are vehicles and perform V2V communication.

[0274] 17. The electronic device according to 16, wherein the first user device and the second user device are considered as a group, and the circuit is configured to receive a group membership report containing information about the second user device from the first user device.

[0275] 18. The electronic device according to 17, wherein the circuit is configured to include the group member information in the handover request to notify the second base station, so that the second base station prepares system information and access resources for the group members.

[0276] 19. A wireless communication method performed by a first user equipment in a wireless communication system, comprising:

[0277] Performing cellular communication with the first base station and performing short-range service direct communication with the second user equipment at the same time;

[0278] measuring a signal of the first base station and a signal of a second base station adjacent to the first base station;

[0279] When the measurement result meets the reporting triggering condition of the A3 event, the A3 event report is triggered;

[0280] receiving an RRC reconfiguration message including a handover configuration regarding handover to the second base station from the first base station; and

[0281] After receiving the RRC reconfiguration message, the short distance service direct communication is performed with the second user equipment using the time and frequency resources in the dedicated resource pool until a connection is successfully established with the second base station.

[0282] 20. The wireless communication method according to 19, wherein the dedicated resource pool is composed of a portion of time-frequency resources specially reserved.

[0283] 21. A wireless communication method according to 19, wherein the dedicated resource pool is provided to the first user equipment by the first base station through an RRC reconfiguration message.

[0284] 22. A wireless communication method according to 19, wherein the source cell of the first base station and the target cell of the second base station share the same dedicated resource pool.

[0285] 23. The wireless communication method according to 19, wherein the resources in the dedicated resource pool are reused by user equipment located at a center position of a cell.

[0286] 24. The wireless communication method according to 19, wherein the dedicated resource pool comprises two parts: a first part for direct communication of security-related short-range services and a second part as the remaining resources.

[0287] 25. The wireless communication method according to any one of 19-24, wherein the first user device and the second user device are vehicles and perform V2V communication.

[0288] 26. The wireless communication method according to 25, wherein the first user equipment and the second user equipment are regarded as a group, and the wireless communication method further comprises:

[0289] The RRC reconfiguration message received from the first base station is sent to the second user equipment.

[0290] 27. The wireless communication method according to 26, wherein the wireless communication method further comprises: reporting the information of the second user equipment to the first base station as the information of the V2V group member.

[0291] 28. A wireless communication method performed by a first base station in a wireless communication system, comprising:

[0292] receiving an A3 event report from a first user equipment, including a signal measurement result of the first user equipment on the first base station and an adjacent second base station;

[0293] Based on the A3 event report, sending a handover request to the second base station and receiving a handover request confirmation from the second base station; and

[0294] An RRC reconfiguration message containing a switching configuration for switching to the second base station is sent to the first user equipment to trigger the first user equipment to use time and frequency resources in a dedicated resource pool to perform short-range direct communication with the second user equipment until the first user equipment successfully establishes a connection with the second base station.

[0295] 29. The wireless communication method according to 28, wherein the dedicated resource pool is composed of a portion of time-frequency resources specially reserved.

[0296] 30. The wireless communication method according to 28, wherein the dedicated resource pool is provided to the first user equipment by the first base station through an RRC reconfiguration message.

[0297] 31. A wireless communication method according to 28, wherein the source cell of the first base station and the target cell of the second base station share the same dedicated resource pool.

[0298] 32. The wireless communication method according to 28, wherein the resources in the dedicated resource pool are reused by user equipment located at a center position of a cell.

[0299] 33. The wireless communication method according to 28, wherein the dedicated resource pool comprises two parts: a first part for direct communication of security-related short-range services and a second part as the remaining resources.

[0300] 34. A wireless communication method according to any one of 28-33, wherein the first user device and the second user device are vehicles and perform V2V communication.

[0301] 35. A wireless communication method according to 34, wherein the first user equipment and the second user equipment are regarded as a group, and the wireless communication method further comprises: receiving a group membership report containing information about the second user equipment from the first user equipment.

[0302] 36. A wireless communication method according to 35, wherein the wireless communication method further comprises: including the group member information in the switching request and notifying the second base station so that the second base station prepares system information and access resources for the group members.

[0303] 37. A cell switching control method for V2V communication, characterized in that the cell switching control method comprises at least one of the following:

[0304] Using vehicle status information to adjust the trigger time of the vehicle reporting the measurement report, the vehicle status information includes the vehicle position and driving direction, wherein the trigger time is shortened when the driving direction is outward along the radial direction of the cell;

[0305] Performing a joint decision based on the handover conditions of a group of vehicles that are performing V2V communication to improve the accuracy and speed of the decision, wherein the group of vehicles includes a sending vehicle and a receiving vehicle; and

[0306] A group of vehicles performing V2V communication is switched in groups to reduce signaling overhead, wherein the group of vehicles includes a sending vehicle and a receiving vehicle.

[0307] 38. The cell switching control method according to 37, characterized in that adjusting the trigger time by using the vehicle status information comprises:

[0308] The base station coordinate information is added to the measurement control sent by the base station, and the vehicle calculates the radial direction of the cell based on its own coordinates and the base station coordinates.

[0309] 39. The cell switching control method according to 37, characterized in that adjusting the trigger time by using vehicle status information comprises:

[0310] The trigger time is adjusted according to the difference between the radial direction of the cell and the driving direction of the vehicle.

[0311] 40. The cell switching control method according to 37 is characterized in that the joint decision based on the switching conditions of a group of vehicles performing V2V communication comprises:

[0312] Within a certain period of time, the base station makes a switching decision after receiving the measurement reports of the sending vehicle and the receiving vehicle, thereby improving the accuracy of the decision.

[0313] 41. The cell switching control method according to 40 is characterized in that the joint decision based on the switching conditions of a group of vehicles performing V2V communication comprises:

[0314] Reduce the trigger time of measurement report.

[0315] 42. The cell switching control method according to 37, characterized in that performing group switching comprises:

[0316] The source base station notifies the target base station of a handover request including group member information;

[0317] The target base station prepares system information and access resources for the members in the group, and informs the source base station in the handover request confirmation;

[0318] The source base station sends system information and access resources to the sending vehicle; and

[0319] The sending vehicle sends system information and access resources to the receiving vehicle.

[0320] 43. The cell switching control method according to 42, characterized in that performing group switching further comprises:

[0321] The source base station records the identification of the sending vehicle or the receiving vehicle, and the corresponding C-RNTI.

[0322] 44. The cell switching control method according to 43, characterized in that performing group switching further comprises:

[0323] Adding the identifier C-RNTI of the sending vehicle to the broadcast information of the sending vehicle;

[0324] The receiving vehicle within the communication range demodulates the broadcast information and immediately sends a joining request to the base station, wherein the joining request includes the receiving vehicle identifier and the sending vehicle identifier C-RNTI;

[0325] The base station receives the joining request on the corresponding time-frequency resource, and records the receiving vehicle identifier and the C-RNTI of the receiving vehicle in the group member information table of the sending vehicle; and

[0326] When the receiving vehicle loses the signal of the sending vehicle, it sends a request to exit to the base station, and the base station deletes the information of the receiving vehicle in the group member information table.

Claims

1. A cell switching control method for V2V communication, characterized in that: The cell switching control method includes at least one of the following: Using vehicle status information to adjust the trigger time of the vehicle reporting the measurement report, the vehicle status information includes the vehicle position and driving direction, wherein the trigger time is shortened when the driving direction is outward along the radial direction of the cell; Performing a joint decision based on the handover conditions of a group of vehicles that are performing V2V communication to improve the accuracy and speed of the decision, wherein the group of vehicles includes a sending vehicle and a receiving vehicle; and A group of vehicles performing V2V communication is switched in groups to reduce signaling overhead, wherein the group of vehicles includes a sending vehicle and a receiving vehicle.

2. The cell switching control method according to claim 1, characterized in that: Using vehicle status information to adjust the trigger time includes: The base station coordinate information is added to the measurement control sent by the base station, and the vehicle calculates the radial direction of the cell based on its own coordinates and the base station coordinates.

3. The cell switching control method according to claim 1, characterized in that: Using vehicle status information to adjust the trigger time includes: The trigger time is adjusted according to the difference between the radial direction of the cell and the driving direction of the vehicle.

4. The cell switching control method according to claim 1, characterized in that: The combined decision of the handover conditions of a group of vehicles in V2V communication includes: Within a certain period of time, the base station makes a switching decision after receiving the measurement reports of the sending vehicle and the receiving vehicle, thereby improving the accuracy of the decision.

5. The cell switching control method according to claim 4, characterized in that: The combined decision of the handover conditions of a group of vehicles in V2V communication includes: Reduce the trigger time of measurement report.

6. The cell switching control method according to claim 1, characterized in that: Performing group switching includes: The source base station notifies the target base station of a handover request including group member information; The target base station prepares system information and access resources for the members in the group, and informs the source base station in the handover request confirmation; The source base station sends system information and access resources to the sending vehicle; and The sending vehicle sends system information and access resources to the receiving vehicle.

7. The cell switching control method according to claim 6, characterized in that: Performing group switching also includes: The source base station records the identification of the sending vehicle or the receiving vehicle, and the corresponding C-RNTI.

8. The cell switching control method according to claim 7, characterized in that: Performing group switching also includes: Adding the identifier C-RNTI of the sending vehicle to the broadcast information of the sending vehicle; The receiving vehicle within the communication range demodulates the broadcast information and immediately sends a joining request to the base station, wherein the joining request includes the receiving vehicle identifier and the sending vehicle identifier C-RNTI; The base station receives the joining request on the corresponding time-frequency resource, and records the receiving vehicle identifier and the C-RNTI of the receiving vehicle in the group member information table of the sending vehicle; and When the receiving vehicle loses the signal of the sending vehicle, it sends a request to exit to the base station, and the base station deletes the information of the receiving vehicle in the group member information table.

9. An electronic device at a first user equipment side in a wireless communication system, comprising a circuit, configured to: Performing cellular communication with the first base station and performing short-range service direct communication with the second user equipment at the same time; measuring a signal of the first base station and a signal of a second base station adjacent to the first base station; When the measurement result meets the reporting triggering condition of the A3 event, the A3 event report is triggered; receiving an RRC reconfiguration message from the first base station including a handover configuration for handover to the second base station; as well as After receiving the RRC reconfiguration message, the short distance service direct communication is performed with the second user equipment using the time and frequency resources in the dedicated resource pool until a connection is successfully established with the second base station.

10. The electronic device according to claim 9, wherein: The dedicated resource pool is composed of a portion of time-frequency resources that are specially reserved.

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