WO2018010267A1

WO2018010267A1 - Communication method and terminal

Info

Publication number: WO2018010267A1
Application number: PCT/CN2016/096731
Authority: WO
Inventors: 苏二路
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-07-14
Filing date: 2016-08-25
Publication date: 2018-01-18
Also published as: CN107635208A

Abstract

Disclosed in embodiments of the present invention are a communication method and terminal. The method comprises: a first terminal determines a D2D terminal set for pairing with the first terminal; the first terminal determines a first frequency offset amount of itself; if the first frequency offset amount is greater than a predetermined first threshold, the first terminal requests each terminal in the D2D terminal set for a frequency offset amount; the first terminal receives a second frequency offset amount sent by each terminal in the D2D terminal set; the first terminal determines, according to the second frequency offset amount of each terminal in the D2D terminal set, a second terminal from the D2D terminal set; and the first terminal establishes a communication connection to the second terminal.

Description

Communication method and terminal

Technical field

The present invention relates to the field of communications, and in particular, to a communication method and a terminal.

Background technique

A device-to-device (D2D) communication based on a cellular network, or ProSeimity Service (ProSeimity Service), means that user data can be directly transmitted between terminals without being transited through the network. D2D communication is significantly different from traditional cellular communication network architecture. The schematic diagram of D2D communication network architecture is shown in Figure 1. In the D2D communication mode, user data is directly transmitted between terminals, which avoids user data transmission in the cellular communication through the network, thereby generating link gain; secondly, resources between D2D users and between D2D and cellular can be recovered. Therefore, the resource multiplexing gain can be generated; the link gain and the resource multiplexing gain can improve the efficiency of the wireless spectrum resource, thereby improving the network throughput.

With the development of mobile communication services and technologies, close-range data sharing, small-scale social and commercial activities, and specific services for local specific users are all in the current and next-stage wireless platforms. Neglected growth points. The introduction of D2D technology based on neighboring user perception is expected to improve the user experience in the above business model. Figure 2-1 shows the application scenario of the D2D technology. As shown in Figure 2-1, the application scenarios of the D2D technology include: (1) UE1 (User Equipment1, User Equipment 1) and UE2 are not in LTE (Long Term Evolution). In the network coverage, when UE1 and UE2 are relatively close, UE1 and UE2 can directly use D2D technology to communicate. When UE1 and UE2 are far away, they must find a relay terminal to access the LTE network. (2) One of UE1 and UE2 is within the coverage of the LTE network, and one is not within the coverage of the LTE network. At this time, it is necessary to find that the relay terminal is transferred to the LTE network by using the D2D technology; (3) UE1 and UE2 are both within the coverage of the LTE network, but UE1 and UE2 are in different network coverage of the base station, and UE1 is at this time. And UE2 can communicate directly through D2D technology; (4) UE1 and UE2 are both within the coverage of the LTE network, and UE1 and UE2 are within the network coverage of the same base station, and UE1 and UE2 can directly communicate through D2D technology. .

The traditional wireless communication network has high requirements for the communication infrastructure, and the damage of the core network or the access network device may cause the communication system to be paralyzed. The introduction of D2D communication has made it possible for cellular communication terminals to establish Ad Hoc (peer-to-peer) networks. When the wireless communication infrastructure is damaged, or in the coverage area of the wireless network, the terminal can realize end-to-end communication or even access to the cellular network by means of D2D, and the application scenario of the wireless communication is further expanded.

At present, for a terminal in motion, the related technical solution can only use the local machine to communicate with the base station. This method has no problem for a terminal with a relatively small frequency, but because the terminal is in motion, the terminal may be due to Doppler effect, etc. The reason is that the frequency offset of the terminal is too high, and the frequency difference between the base station and the base station becomes larger, which ultimately leads to poor stability of the terminal data service.

When multiple terminals maintain the same direction, the same speed of motion, that is, the terminals are relatively static, but the terminal and the base station are in motion, such as trains, high-speed rails, etc. (as shown in Figure 2-2), D2D The terminal A performs data service in the cell, and the terminal A is far away from the LTE cell. Therefore, the frequency offset of the terminal A may become very high due to high speed or interference, thereby seriously affecting the stability of the terminal data service, and the terminal B is Close to the LTE cell, the frequency offset of terminal B will be relatively low, and the data service is relatively stable. At present, when a frequency offset is large for a terminal in a motion process, the related technical solution can only use the terminal itself to communicate with the base station to perform data services. At this time, the terminal data service may be unstable.

Summary of the invention

In order to solve the related technical problem, the embodiment of the present invention provides a communication method and a terminal, which enable the terminal to maintain a stable data service when the frequency offset of the terminal is large.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

In a first aspect, an embodiment of the present invention provides a communication method, where the method includes:

Determining, by the first terminal, a set of D2D terminals paired with the first terminal;

The first terminal determines its own first frequency offset;

If the first frequency offset is greater than a preset first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set;

Receiving, by the first terminal, a second frequency offset sent by each terminal in the D2D terminal set;

Determining, by the first terminal, the second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

The first terminal establishes a communication connection with the second terminal.

In a second aspect, an embodiment of the present invention provides a communication method, where the method includes:

The second terminal sends its own second frequency offset to the first terminal, where the second terminal is a terminal in the D2D terminal set paired with the first terminal;

Receiving, by the second terminal, the establishment request sent by the first terminal, and establishing a communication connection with the first terminal according to the establishment request;

Receiving, by the second terminal, the first data sent by the base station, and sending the first data to the first terminal;

The second terminal receives the second data sent by the first terminal, and sends the second data to the base station.

In a third aspect, an embodiment of the present invention provides a D2D terminal, where the D2D terminal includes:

a first determining unit, configured to determine a D2D terminal set paired with the D2D terminal;

a second determining unit, configured to determine a first frequency offset of the D2D terminal itself;

a first requesting unit, configured to request a frequency offset from each terminal in the D2D terminal set if the first frequency offset is greater than a preset first threshold;

a first receiving unit, configured to receive, sent by each terminal in the D2D terminal set Second frequency offset;

a third determining unit, configured to determine a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

The first establishing unit is configured to establish a communication connection with the second terminal.

In a fourth aspect, an embodiment of the present invention provides a D2D terminal, where the D2D terminal includes:

a third sending unit, configured to send a second frequency offset of the first terminal to the first terminal, where the second terminal is a terminal in the D2D terminal set paired with the first terminal;

a fifth receiving unit, configured to receive an establishment request sent by the first terminal, and establish a communication connection with the first terminal according to the establishment request;

a fourth sending unit, configured to receive first data sent by the base station, and send the first data to the first terminal;

The sixth receiving unit is configured to receive the second data sent by the first terminal, and send the second data to the base station.

In the embodiment of the present invention, a computer storage medium is further provided, and the computer storage medium may store an execution instruction for executing the communication method in the foregoing embodiment.

An embodiment of the present invention provides a communication method and a terminal, where: a first terminal determines a D2D terminal set paired with the first terminal; the first terminal determines a first frequency offset of the first terminal; A frequency offset is greater than a preset first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set; the first terminal receives each of the D2D terminal sets a second frequency offset sent by the terminal; the first terminal determines a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals; the first terminal Establishing a communication connection with the second terminal; thus, the terminal can maintain the data service of the terminal stably when the frequency offset of the terminal is large.

DRAWINGS

1 is a schematic diagram of a D2D communication network architecture;

Figure 2-1 is a schematic diagram of an application scenario of the D2D technology;

Figure 2-2 shows the application of D2D technology in high-speed rail scenarios;

3 is a schematic flowchart of implementing a communication method according to an embodiment of the present invention;

4 is a schematic flowchart of implementing a communication method according to Embodiment 2 of the present invention;

FIG. 5 is a schematic flowchart of an implementation process of a third communication method according to Embodiment 3 of the present invention; FIG.

6-1 is a schematic structural diagram of a fourth communication system according to Embodiment 4 of the present invention;

6-2 is a schematic flowchart of implementing a communication method according to Embodiment 4 of the present invention;

Figure 6-3 is a schematic diagram of the frequency offset generated by the terminal during the operation of the high-speed rail;

7 is a schematic flowchart of implementing a communication method according to Embodiment 5 of the present invention;

8 is a schematic structural diagram of a communication system according to Embodiment 6 of the present invention;

FIG. 9 is a schematic structural diagram of a communication system according to Embodiment 7 of the present invention.

detailed description

The technical solutions of the present invention are further elaborated below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1

In order to solve the technical problem in the prior art, the embodiment of the present invention provides a communication method, and FIG. 3 is a schematic flowchart of the implementation of the communication method according to the embodiment of the present invention. As shown in FIG. 3, the method includes:

Step S301, the first terminal determines a D2D terminal set that is paired with the first terminal.

Here, the first terminal is in a motion state, the terminal in the D2D terminal set paired with the first terminal is also in a motion state, and the first terminal and the D2D paired with the first terminal are The terminals in the terminal set are relatively stationary. The first terminal may Receiving, by the base station, a request for acquiring a terminal in the D2D pairing group with the first terminal, and receiving a response sent by the base station, where the response carries identifier information of a terminal set of the D2D pairing group with the first terminal. The first terminal is configured to be a set of D2D terminals that are paired with the first terminal in a D2D pairing group, and is determined to be a D2D terminal set that is paired with the first terminal; the first terminal may also use its own discovery mechanism. Automatically acquiring identification information of other D2D-enabled terminals within a certain distance, and sending a pairing request to the other D2D-enabled terminals, and determining a terminal set responding to the pairing request as a D2D paired with the first terminal Terminal collection.

Step S302, the first terminal determines its own first frequency offset;

Here, the first terminal determines the first frequency offset according to a hardware module that is used by itself to determine a frequency offset.

Step S303, if the first frequency offset is greater than a preset first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set;

Step S304, the first terminal receives a second frequency offset sent by each terminal in the D2D terminal set.

Step S305, the first terminal determines a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

Here, the first terminal compares the received second frequency offset of each terminal in the D2D terminal set with its own first frequency offset, and selects a first frequency offset that is smaller than itself. The smallest second frequency offset in the quantity determines the terminal corresponding to the second offset as the second terminal.

Step S306, the first terminal establishes a communication connection with the second terminal.

Here, when the first frequency offset of the first terminal exceeds the set first threshold, if the first terminal performs data service through the base station, because the first frequency offset is too large, causing data The service is unstable. The first terminal establishes a communication connection with the second terminal, and the second terminal has a small frequency offset. The first terminal passes the second terminal and the base station. The communication connection is made, thereby improving the stability of the data service.

In the embodiment of the present invention, the first terminal determines a D2D terminal set that is paired with the first terminal; the first terminal determines its own first frequency offset; if the first frequency offset is greater than a preset a first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set; the first terminal receives a second frequency offset sent by each terminal in the D2D terminal set Transmitting; determining, by the first terminal, a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals; establishing, by the first terminal, communication with the second terminal Connection; in this way, the stability of data traffic between the first terminal and the base station can be improved.

Embodiment 2

The embodiment of the present invention further provides a communication method, and FIG. 4 is a schematic flowchart of the implementation method of the communication method according to the second embodiment of the present invention. As shown in FIG. 4, the method includes:

Step S401, the first terminal determines a D2D terminal set that is paired with the first terminal;

Here, the first terminal is in a motion state, the terminal in the D2D terminal set paired with the first terminal is also in a motion state, and the first terminal and the D2D paired with the first terminal are The terminals in the terminal set are relatively stationary.

Step S402, the first terminal determines its own first frequency offset;

Step S403, determining whether the first frequency offset is greater than a preset first threshold;

Step S404, if the first frequency offset is greater than a preset first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set;

Step S405, each terminal in the D2D terminal set sends a second frequency offset to the first terminal.

Here, the first terminal receives a second frequency offset sent by each terminal in the D2D terminal set.

Step S406, the first terminal determines a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

Here, the first terminal compares the received second frequency offset of each terminal in the D2D terminal set with its own first frequency offset, and selects a first frequency offset that is smaller than itself. The smallest second frequency offset is determined by the terminal corresponding to the second offset as the second terminal.

Step S407, the first terminal sends a setup request to the second terminal, and the first terminal establishes a communication connection with the second terminal according to the establishment request.

Here, the second terminal receives the establishment request and establishes a communication connection with the first terminal based on the establishment request.

Step S408, the first terminal disconnects from the base station;

Step S409, the first terminal receives the first data sent by the second terminal from the base station;

Here, the second terminal receives the first data sent by the base station, and sends the first data to the first terminal.

Step S410, the first terminal sends, to the second terminal, second data for sending to the base station;

Here, the second terminal receives the second data sent by the first terminal, and sends the second data to the base station.

Step S411, determining whether the linear distance between the first terminal and the second terminal exceeds a preset second threshold;

Here, since the first terminal and the second terminal are both in a moving state, the distance between the first terminal and the second terminal may change during the motion.

Step S412, if the linear distance between the first terminal and the second terminal exceeds a preset second threshold, the first terminal disconnects the communication connection with the second terminal, and then Go to step S401;

Step S413, if the linear distance between the first terminal and the second terminal does not exceed a preset second threshold, the second terminal determines its own third frequency offset;

Step S414, the second terminal determines whether the third frequency offset is greater than a preset first threshold;

Step S415, if the third frequency offset is greater than a preset first threshold, the second terminal sends signaling to the first terminal.

Here, the signaling is used to notify the first terminal that the third frequency offset of the second terminal exceeds the first threshold, and the first terminal receives the signaling.

Step S416, the first terminal determines a fourth frequency offset of the first terminal itself;

Step S417, the first terminal determines whether the fourth frequency offset is less than a preset third threshold;

Step S418, if the fourth frequency offset is less than a preset third threshold, the first terminal establishes a communication connection with the base station;

Here, the third threshold is different from the first threshold, and the third threshold is a low threshold for determining whether to adopt the D2D communication method provided by the embodiment of the present invention, where the first threshold is According to the high threshold of the D2D communication method provided by the embodiment of the present invention, when the frequency offset of the terminal is greater than the first threshold or greater than the third threshold, the terminal is triggered to search by using the D2D communication method provided by the embodiment of the present invention. The D2D terminal that the terminal can communicate with.

Step S419, the second terminal disconnects the communication connection with the base station;

Step S420, the first terminal receives the third data sent by the base station, and sends the third data to the second terminal.

Here, the second terminal receives third data from the base station and sent by the first terminal.

Step S421, the first terminal receives the fourth data sent by the second terminal, and sends the fourth data to the base station;

Here, the second terminal sends fourth data that needs to be sent to the base station to the first terminal.

Step S422, if the fourth frequency offset is not less than a preset third threshold, the first terminal disconnects the communication connection with the second terminal, and proceeds to step S404.

Embodiment 3

The embodiment of the present invention first provides a communication method. The embodiment of the present invention describes a terminal A that supports the D2D function. The terminal A is in a motion state, and the terminal A is far away from the base station during the motion, so the The frequency offset of the terminal A is high, and the data service of the terminal A is unstable. This embodiment provides a D2D communication method to solve the technical problem. FIG. 5 is a third D2D communication method according to an embodiment of the present invention. A schematic diagram of the implementation process is shown in FIG. 5, and the method is specifically as follows:

First, it is assumed that there are terminal A and terminal set Ba supporting D2D function, terminal A is far away from the base station, and terminal set Ba (ie, all D2D terminals that are closer to the base station and paired with terminal A) are closer to the base station, and all terminals are Both are in motion and the terminal A and the terminal set Ba are relatively stationary.

Step S501, the terminal A determines whether the frequency offset of the terminal is greater than a threshold value;

Here, the terminal A determines its own first frequency offset, and determines whether the first frequency offset of the terminal is greater than the first threshold. The first threshold may be set according to an actual scenario.

Step S502, if the first frequency offset does not exceed the first threshold, the terminal A performs data communication with the base station according to the normal mode;

Step S503, when the first frequency offset exceeds the first threshold, the terminal A sends a multicast carrying its own first frequency offset to other already paired D2D terminal sets Ba;

Step S504, the terminal set Ba compares its own frequency offset and the frequency offset from the terminal A;

Here, the terminal Ba receives the multicast sent by the terminal A, and parses the multicast to obtain the first frequency offset of the terminal A, compares the second frequency offset of itself with the terminal A from the terminal. The first frequency offset.

Step S505, the pairing terminal Bx sends its own frequency offset to the terminal A;

Here, if the second frequency offset of the terminal Bx in the terminal set Ba is smaller than the first frequency offset of the terminal A, that is, Δf_B < Δf_A, the paired terminal Bx transmits its own second frequency offset. The quantity is given to terminal A, Δf_B represents the second frequency offset, and Δf_A represents the first frequency offset. Where, Ba represents a set of all D2D terminals that are relatively close to the center of the base station and has a lower frequency offset, paired with the terminal A; Bx represents a closer to the center of the base station and the second frequency offset of the second frequency offset is smaller than the first frequency offset Any one of all D2D terminals paired with the terminal A.

Step S506, the terminal A receives the terminal B with the smallest frequency offset selected from the paired terminal Bx and establishes a communication connection with the terminal B;

Here, the terminal A selects the terminal B with the smallest second frequency offset after receiving the second frequency offset from the paired terminal Bx (the terminal with the smallest second frequency offset among the selected Ba sets) Establishing a communication connection with the terminal B.

Step S507, the terminal A receives the communication data sent by the terminal B;

Here, B denotes the terminal with the smallest second frequency offset among the selected Ba sets, and the communication data is from the base station.

Step S508, the distance between the terminal A and the terminal B changes and exceeds a certain distance, then returns to step S501 to re-determine the frequency offset of the terminal A shown;

Here, if the distance between the terminal A measurement and the terminal B changes and exceeds a preset second threshold, then returning to step S501, the first frequency offset of the terminal A is re-determined.

Step S509, determining that the frequency offset of the terminal B is greater than a threshold;

Here, if the distance between the terminal A and the terminal B does not exceed the second threshold, the terminal B and the base station determine a third frequency offset of the terminal B during communication.

Step S510, the terminal B sends signaling to A;

Here, if the third frequency offset of the terminal B exceeds a first threshold, the terminal The B sends a signaling to the terminal A, where the signaling is used to notify the terminal A that the third frequency offset of the terminal B is too large, that is, the terminal A is prompted to have a larger frequency.

Step S511, the terminal A determines whether the frequency offset of the terminal is lower than a value;

Here, the terminal A determines its own fourth frequency offset at this time, and determines whether the fourth frequency offset is lower than the third threshold.

Step S512, if the fourth frequency offset of the terminal A is lower than the third threshold, the terminal A establishes a communication connection with the base station;

In step S513, the terminal B receives the communication data sent by the terminal A.

Here, the terminal B disconnects the communication connection with the base station, and the terminal B communicates with the base station through the terminal A.

In this embodiment, when the terminal (terminal A) supporting the D2D function performs data service during the motion, the technical solution provided by the embodiment of the present invention can avoid data instability caused by excessive frequency offset at the cell edge. Moreover, the terminal does not directly communicate with the base station using its own frequency compensation value, but communicates with the terminal with a small frequency offset (terminal B), and the terminal A receives the communication data sent by the terminal B, and further Data communication anomalies caused by excessive frequency offset are greatly reduced.

Embodiment 4

The present invention provides a communication and system. FIG. 6-1 is a schematic structural diagram of a communication system according to Embodiment 4 of the present invention. As shown in FIG. 6-1, the system includes a terminal A601, a terminal B602, and a base station 603. The terminal A601 includes a first frequency offset determining module 611, a first communications module 612, a first distance measuring module 613, and a first frequency offset varying module 614, and the terminal B602 includes a second frequency offset determining module 621. a second communication module 622, a second distance measurement module 623, and a second frequency offset variation module 624, wherein:

The first frequency offset determining module 611 is configured to determine a first frequency offset of the first frequency offset, and when the first frequency offset exceeds the first threshold, the terminal A sends a multicast carrying The first frequency offset of the body is given to other already paired D2D terminal sets Ba;

The first communication module 612 is configured to establish a communication connection with the terminal B, the terminal A and the terminal B communicate, and the terminal A receives the data sent by the terminal B from the base station;

The first distance measurement module 613 is configured to measure a linear distance between the terminal A and the terminal B, and determine whether a linear distance between the terminal A and the terminal B exceeds a predetermined second threshold;

The first frequency offset change module 614 is configured to generate a frequency offset due to the terminal A during the motion if the linear distance between the terminal A and the terminal B does not exceed the second threshold. Changing, determining a fourth frequency offset of the terminal A, and determining whether the fourth frequency offset is less than a third threshold, if the fourth frequency offset of the terminal A at this time is lower than a third threshold And the terminal A establishes communication with the base station;

The second frequency offset determining module 621 is configured to determine its own second frequency offset, and the terminal B compares its own second frequency offset and the first frequency offset, if the terminal set B The second frequency offset is less than the first frequency offset of the terminal A, that is, Δf_B < Δf_A, the terminal B transmits its own second frequency offset to the terminal A;

The second communication module 622 is configured to establish a communication connection with the terminal A, and the terminal B communicates with the terminal A;

The second distance measuring module 623 is configured to measure a linear distance between the terminal B and the terminal A, and determine whether a linear distance between the terminal B and the terminal A exceeds a predetermined second threshold;

The second frequency offset change module 624 is configured to determine, when the terminal B changes the frequency offset during the motion, determine the third frequency offset of the terminal B, and determine the third frequency. Whether the offset is greater than a first threshold, and if the third frequency offset is greater than the first threshold, the terminal B disconnects communication with the base station and communicates with the base station through the terminal A.

The embodiment further provides a terminal supporting the D2D function, wherein the terminal is on the high-speed rail. For example, if the terminal is far away from the center of the cell, a relatively large frequency offset is generated. In order to reduce the impact on the data service due to the large frequency offset, the embodiment provides A D2D communication method, FIG. 6-2 is a schematic flowchart of an implementation process of a D2D communication method according to an embodiment of the present invention. As shown in FIG. 6-2, the method includes:

Step S601, the terminal A determines the first frequency offset of the self. When the first frequency offset exceeds the first threshold, the terminal A sends the multicast to carry its own first frequency offset to other Paired D2D terminal set Ba, the terminal in the terminal set Ba compares its own second frequency offset and the first frequency offset, if the second frequency offset of the terminal Bx in the terminal set Ba is less than The first frequency offset of the terminal A, that is, Δf_B < Δf_A, the pairing member Bx sends its own second frequency offset to the terminal A;

Here, Figure 6-3 is a schematic diagram of the frequency offset generated by the terminal during the operation of the high-speed rail. The frequency offset of the terminal is due to the Doppler effect, and the calculation method of the Doppler shift:

Where v is the vehicle speed, c is the speed of light, f is the center frequency of the cell, and fd is the Doppler shift. As shown in Figure 6-3, f ₀ is the frequency sent by the base station, and f ₁ is the frequency sent by the terminal. It is the angle between the connection between the base station and the terminal and the horizontal line. As can be seen from Figure 6-3, When the terminal is close to the base station, the downlink frequency sent by the base station received by the terminal is f ₀ +f _d , and the frequency of the uplink sent by the base station is f ₁ +2f _d . When the terminal is far away from the base station, the base station receives the downlink. The frequency of the transmission is f ₀ -f _d , and the frequency of the uplink sent by the terminal received by the base station is f ₁ -2f _d .

Step S602, the terminal A receives the second frequency offset from the paired terminal Bx, selects the terminal B with the smallest first frequency offset, and establishes a communication connection with the terminal B, and the terminal A receives the The communication data sent by terminal B;

In step S603, it is determined whether the distance between the terminal A and the terminal B changes. If the change occurs and exceeds the second threshold, the process returns to step S601 to determine the first frequency offset.

Step S604, the terminal B and the base station determine their own third frequency offset in the communication process. If the third frequency offset of the terminal B exceeds the first threshold, the terminal B notifies. The terminal A, if the fourth frequency offset of the terminal A at this time is lower than a third threshold, the terminal A establishes communication with the base station, and the terminal B disconnects the communication with the base station and passes the Terminal A communicates with the base station.

Embodiment 5

This embodiment first provides an interaction method of a communication system. The following is a specific example to illustrate data when the terminal is far away from the base station to perform data services during the motion, in order to avoid data caused by excessive frequency offset. FIG. 7 is a schematic flowchart of an implementation method of an interaction method of a D2D communication system according to Embodiment 5 of the present invention. As shown in FIG. 7, the method includes:

Step S701, the terminal A determines whether the frequency offset of the terminal is greater than the first threshold;

Here, the terminal A determines its own first frequency offset, and determines whether the first frequency offset of the terminal is greater than the first threshold. The first threshold may be set according to the actual scenario.

Step S702, the terminal A sends a multicast carrying its own frequency offset to other pairs of D2D terminal sets that have been paired;

Step S703, the paired terminal set Bx sends its own frequency offset to the terminal A;

Here, the terminal Ba receives the multicast sent by the terminal A, and parses the multicast to obtain the first frequency offset of the terminal A, compares the second frequency offset of itself with the terminal A from the terminal. The first frequency offset. If the second frequency offset of the terminal Bx in the terminal set Ba is smaller than the first frequency offset of the terminal A, that is, Δf_B<Δf_A, the paired terminal Bx sends its own second frequency offset to Terminal A, Δf_B represents the second frequency offset, and Δf_A represents the first frequency offset.

Step S704, the terminal A selects the terminal B with the smallest frequency offset and establishes a communication connection with the terminal B.

Step S705, the terminal A receives the communication data sent by the terminal B.

Here, the terminal A disconnects the communication connection with the base station, and the terminal B and the base station Communicate.

Step S706, the frequency offset of the terminal B is greater than the first threshold;

Here, since both the terminal A and the terminal B are in a motion state, the distance between the terminal A and the terminal B may change, and the frequency offsets of the terminal A and the terminal B also change. Determining a third frequency offset of the terminal B during communication between the terminal B and the base station if the terminal A measures a change from the terminal B but does not exceed a preset second threshold. .

Step S707, the terminal B sends a signaling to notify the terminal A;

Here, if the third frequency offset of the terminal B is greater than the first threshold, the terminal B sends information to the terminal A, where the signaling is used to notify the terminal A that the terminal is at this time. The frequency offset of B is too large.

Step S708, the terminal A establishes communication with the base station;

Here, after receiving the signaling sent by the terminal B, the terminal A determines its own fourth frequency offset. If the fourth frequency offset is less than the third threshold, the terminal A and the The base station establishes a communication connection.

In step S709, the terminal B receives the communication data sent by the terminal A.

Here, the terminal B disconnects the communication connection with the base station, and communicates with the base station through the terminal A.

It can be seen from the present embodiment that it is assumed that there are two terminals supporting the D2D function, the terminal A is far from the base station, the terminal Bx is closer to the base station, and the terminal A determines its own first frequency offset, when the first When a frequency offset exceeds the first threshold, the terminal A sends a multicast carrying its own first frequency offset to other already paired D2D terminal sets Ba, and each terminal in the terminal set Ba compares its own second. a frequency offset and a first frequency offset from the terminal A, if the second frequency offset of the terminal Bx in the terminal set Ba is smaller than the first frequency offset of the terminal A, that is, Δf_B < Δf_A , the pairing member Bx sends its own second frequency offset to the terminal A;

Receiving, by the terminal A, the second frequency offset from the pairing terminal Bx, selecting the terminal B with the smallest second frequency offset and establishing a communication connection with the terminal B, and the terminal A receiving the terminal B Transmitting from the communication data with the base station; if the distance between the terminal A and the terminal B changes, and exceeds the second threshold, returning to the first step to re-determine the first frequency offset of the terminal A ;

Determining, by the terminal B and the base station, a third frequency offset of the terminal B, if the third frequency offset of the terminal B exceeds a first threshold, the terminal B notifies the terminal A of the When the third frequency offset of the terminal B exceeds the first threshold, the terminal A determines its own fourth frequency offset, if the fourth frequency offset of the terminal A is lower than the third The threshold is such that the terminal A establishes a communication connection with the base station, and the terminal B disconnects the communication connection with the base station and communicates with the base station through the terminal A.

Embodiment 6

Based on the foregoing embodiments, an embodiment of the present invention provides a communication system, and FIG. 8 is a schematic structural diagram of the system. As shown in FIG. 8, the communication system includes a first terminal 801, a second terminal 802, and a base station 803. The first terminal 801 includes: a first determining unit 811, a second determining unit 812, a first requesting unit 813, a first receiving unit 814, a third determining unit 815, a first establishing unit 816, and a first disconnecting unit. The unit 817, the first sending unit 818, and the second receiving unit 819; the second terminal 802 includes: a third sending unit 821, a third establishing unit 822, a sixth receiving unit 823, and a fourth sending unit 824, where:

The first determining unit 811 is configured to determine a D2D terminal set that is paired with the first terminal;

The second determining unit 812 is configured to determine a first frequency offset of the first terminal itself;

The first requesting unit 813 is configured to: if the first frequency offset is greater than a preset first threshold, request a frequency offset from each terminal in the D2D terminal set;

The third sending unit 821 is configured to send its second frequency offset to the first terminal. The second terminal is a terminal in a D2D terminal set paired with the first terminal;

The first receiving unit 814 is configured to receive a second frequency offset sent by each terminal in the D2D terminal set.

The third determining unit 815 is configured to determine a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

The first establishing unit 816 is configured to establish a communication connection with the second terminal;

The third establishing unit 822 is configured to receive an establishment request sent by the first terminal, and establish a communication connection with the first terminal according to the establishment request;

The first disconnecting unit 817 is configured to disconnect the communication connection with the base station 803;

The first sending unit 818 is configured to send, to the second terminal, second data for sending to the base station 803;

The sixth receiving unit 823 is configured to receive the second data sent by the first terminal, and send the second data to the base station 803;

The fourth sending unit 824 is configured to receive the first data sent by the base station 803, and send the first data to the first terminal;

The second receiving unit 819 is configured to receive the first data sent by the second terminal from the base station 803.

It should be noted here that the description of the above embodiment of the communication system is similar to the description of the above embodiment of the method, and has similar advantageous effects as the method embodiment, and therefore will not be described again. For the technical details that are not disclosed in the embodiment of the communication system of the present invention, please refer to the description of the method embodiment of the present invention, and the details are not described herein.

Example 7

The present embodiment provides a communication system according to the foregoing embodiment. FIG. 9 is a schematic structural diagram of a communication system according to Embodiment 7 of the present invention. As shown in FIG. 9, the system includes a first terminal 901. The second terminal 902 and the base station 903, the first terminal 901 includes: a first determining unit 911, a second disconnecting unit 912, a fourth determining unit 913, a fifth determining unit 914, a third receiving unit 915, and a sixth determining a unit 916, a fourth determining unit 917, a second establishing unit 918, a second transmitting unit 919, a fourth receiving unit 9110, a third disconnecting unit 9111, and a second requesting unit 9112, the second terminal 902 comprising: a seventh a determining unit 921, a second determining unit 922, a fifth transmitting unit 923, a fourth disconnecting unit 924, an eighth receiving unit 925, and a sixth transmitting unit 926, wherein:

The first determining unit 911 is configured to determine whether a linear distance between the first terminal and the second terminal exceeds a preset second threshold;

Disconnecting the second terminal with the second terminal connection;

The fourth determining unit 913 is configured to redetermine the D2D terminal set paired with the first terminal;

The fifth determining unit 914 is configured to determine a first frequency offset of the first terminal itself,

The seventh determining unit 921 is configured to determine, if the linear distance between the first terminal and the second terminal does not exceed a preset second threshold, the second terminal determines its own third frequency offset the amount;

The second determining unit 922 is configured to determine whether the third frequency offset is greater than a preset first threshold;

The fifth sending unit 923 is configured to: if the third frequency offset is greater than a preset first threshold, the second terminal sends signaling to the first terminal;

Here, the signaling is used to notify the first terminal that the third frequency offset of the second terminal exceeds the first threshold.

The third receiving unit 915 is configured to receive signaling sent by the second terminal;

The sixth determining unit 916 is configured to determine a fourth frequency offset of the first terminal itself;

The fourth determining unit 917 is configured to determine whether the fourth frequency offset is less than a preset third threshold;

The second establishing unit 918 is configured to establish a communication connection with the base station if the fourth frequency offset is less than a preset third threshold, wherein the third threshold is different from the first threshold Two thresholds;

The second sending unit 919 is configured to receive third data sent by the base station, and send the third data to the second terminal;

The eighth receiving unit 925 is configured to receive third data from the base station that is sent by the first terminal.

The fifth sending unit 926 is configured to send, to the first terminal, fourth data for sending to the base station;

The fourth receiving unit 9110 is configured to receive fourth data sent by the second terminal, and send the fourth data to the base station;

The third disconnecting unit 9111 is configured to disconnect the communication connection with the second terminal if the fourth frequency offset is not less than a preset third threshold;

The second requesting unit 9112 is configured to request a frequency offset from each of the D2D terminal sets paired with the first terminal.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1. The first terminal determines a D2D terminal set that is paired with the first terminal.

S2. The first terminal determines its own first frequency offset.

S3. If the first frequency offset is greater than a preset first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set.

S4. The first terminal receives a second frequency offset sent by each terminal in the D2D terminal set.

S5. The first terminal determines, according to the second frequency offset of each terminal in the D2D terminal set, the second terminal from the D2D terminal set.

S6. The first terminal establishes a communication connection with the second terminal.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

The embodiment of the invention provides a communication method and a terminal, wherein: the first terminal determines a D2D terminal set paired with the first terminal; the first terminal determines its own first frequency offset; if the first frequency offset is greater than Determining a first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set; the first terminal receives a second frequency offset sent by each terminal in the D2D terminal set; the first terminal Determining, by the second frequency offset of each terminal in the D2D terminal set, the second terminal from the D2D terminal set; the first terminal establishes a communication connection with the second terminal; thus, the terminal can make the frequency offset of the terminal larger At the same time, the terminal's data service can also remain stable.

Claims

A communication method, the method comprising:

Determining, by the first terminal, a set of D2D terminals paired with the first terminal;

The first terminal determines its own first frequency offset;

If the first frequency offset is greater than a preset first threshold, the first terminal requests a frequency offset from each terminal in the D2D terminal set;

Receiving, by the first terminal, a second frequency offset sent by each terminal in the D2D terminal set;

Determining, by the first terminal, the second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

The first terminal establishes a communication connection with the second terminal.
The method of claim 1 wherein the method further comprises:

Transmitting, by the first terminal, a communication connection with a base station;

Receiving, by the first terminal, first data sent by the second terminal from the base station;

The first terminal sends second data for sending to the base station to the second terminal.
The method of claim 1 or 2, wherein the method further comprises:

Determining, by the first terminal, whether a linear distance between the first terminal and the second terminal exceeds a preset second threshold;

If the linear distance between the first terminal and the second terminal exceeds a preset second threshold, the first terminal disconnects the communication connection with the second terminal;

Determining, by the first terminal, a set of D2D terminals paired with the first terminal;

The first terminal determines a first frequency offset of the first terminal itself.
The method of claim 3 wherein the method further comprises:

If the linear distance between the first terminal and the second terminal does not exceed a preset second threshold, the first terminal receives signaling sent by the second terminal, where the signaling is used by Notifying the third terminal that the third terminal offset of the second terminal exceeds the first a threshold and requesting a frequency offset of the first terminal;

Determining, by the first terminal, a fourth frequency offset of the first terminal itself;

Determining, by the first terminal, whether the fourth frequency offset is less than a preset third threshold;

If the fourth frequency offset is less than the third threshold, the first terminal establishes a communication connection with the base station, where the third threshold is different from the first threshold by two thresholds;

Receiving, by the first terminal, third data sent by the base station, and sending the third data to the second terminal;

The first terminal receives fourth data sent by the second terminal, and sends the fourth data to the base station.
The method of claim 4 wherein the method further comprises:

If the fourth frequency offset is not less than a preset third threshold, the first terminal disconnects a communication connection with the second terminal;

The first terminal requests a frequency offset from each of the D2D terminal sets paired with the first terminal.
A communication method, the method comprising:

The second terminal sends its own second frequency offset to the first terminal, where the second terminal is a terminal in the D2D terminal set paired with the first terminal;

Receiving, by the second terminal, the establishment request sent by the first terminal, and establishing a communication connection with the first terminal according to the establishment request;

Receiving, by the second terminal, the first data sent by the base station, and sending the first data to the first terminal;

The second terminal receives the second data sent by the first terminal, and sends the second data to the base station.
The method of claim 6 wherein the method further comprises:

The second terminal determines its own third frequency offset;

Determining, by the second terminal, whether the third frequency offset is greater than a preset first threshold;

And if the third frequency offset is greater than a preset first threshold, the second terminal sends signaling to the first terminal, where the signaling is used to notify the first terminal The third frequency offset of the second terminal exceeds the first threshold.
The method of claim 7 wherein the method further comprises:

Transmitting, by the second terminal, a communication connection with a base station;

The second terminal receives third data sent by the first terminal from the base station;

The second terminal sends fourth data for sending to the base station to the first terminal.
A device to device D2D terminal, the D2D terminal comprising:

a first determining unit, configured to determine a D2D terminal set paired with the D2D terminal;

a second determining unit, configured to determine a first frequency offset of the D2D terminal itself;

a first requesting unit, configured to request a frequency offset from each terminal in the D2D terminal set if the first frequency offset is greater than a preset first threshold;

a first receiving unit, configured to receive a second frequency offset sent by each terminal in the D2D terminal set;

a third determining unit, configured to determine a second terminal from the set of D2D terminals according to a second frequency offset of each terminal in the set of D2D terminals;

The first establishing unit is configured to establish a communication connection with the second terminal.
A device to device D2D terminal, the D2D terminal comprising:

a third sending unit, configured to send a second frequency offset of the first terminal to the first terminal, where the D2D terminal is a terminal in a D2D terminal set paired with the first terminal;

a fifth receiving unit, configured to receive an establishment request sent by the first terminal, based on the Establishing a request to establish a communication connection with the first terminal;

a fourth sending unit, configured to receive first data sent by the base station, and send the first data to the first terminal;

The sixth receiving unit is configured to receive the second data sent by the first terminal, and send the second data to the base station.