WO2013044866A1

WO2013044866A1 - Synchronization time difference obtaining method, device, and system

Info

Publication number: WO2013044866A1
Application number: PCT/CN2012/082423
Authority: WO
Inventors: 肖登坤; 蔺波; 杨青
Original assignee: 华为技术有限公司
Priority date: 2011-09-29
Filing date: 2012-09-29
Publication date: 2013-04-04
Also published as: CN103037406A

Abstract

Disclosed are a synchronization time difference obtaining method, device, and system. According to an embodiment of the present invention, an arrival time of a first path of a signal transmitted by a base station or a frame header position of a signal transmitted by the base station is detected, a synchronization time difference is calculated according to the arrival time on the first path of the signal transmitted by the base station or the frame header position of the signal transmitted by the base station, and then the synchronization time difference is sent to the detected base station, so that the base station can obtain the synchronization time difference between the base station and a base station having an X2 interface therebetween, and relevant processing may be performed subsequently according to the synchronization time difference. For example, search performance and interference coordination capability of a cell are improved on the basis of the synchronization time difference.

Description

Synchronization time difference acquisition method, device and system

The present application claims the priority of the Chinese Patent Application No. 201110293439.4, entitled "Synchronization Time Difference Acquisition Method, Apparatus and System", filed on September 29, 2011, the entire contents of which is incorporated herein by reference. in. Technical field

The present invention relates to the field of communications technologies, and in particular, to a synchronization information acquisition method, apparatus, and system. Background technique

In the Long Term Evolution (LTE-A, Long-term Evolution Advance) system, a low power node (LPN) is introduced, and a low power node and a macro base station together form a heterogeneous network. In a heterogeneous network, the base stations that cover the same interfere with each other. Therefore, interference coordination needs to be performed on the heterogeneous network.

In the simulation experiment of interference coordination for heterogeneous networks, the inventors of the present invention found that the synchronization time difference between the two base stations has a certain relationship with the search performance of the cell and whether the interference coordination can be more accurate, but in the prior art In the synchronous network or the asynchronous network, the clocks of the base stations are not accurately synchronized, and there is no related technology in the prior art on how to acquire synchronization information between the base stations. Summary of the invention

Embodiments of the present invention provide a synchronization time difference acquisition method, apparatus, and system, which can acquire a synchronization time difference between two base stations.

According to an aspect of the present invention, in an executable manner, a synchronization time difference acquisition method is provided, including:

The terminal respectively detects a first path arrival time of the signals transmitted by the at least two base stations;

Calculating a synchronization time difference according to a first path arrival time of the signals transmitted by the at least two base stations; and transmitting the synchronization time difference to a serving base station of the terminal. According to another aspect of the present invention, in an executable manner, a synchronization time difference acquisition method is provided, including:

Detecting a frame header position of a signal transmitted by the base station;

Calculating a synchronization time difference according to a frame header position of a signal transmitted by the base station;

The synchronization time difference is transmitted to the macro base station.

According to another aspect of the present invention, in an executable manner, a communication device is provided, including:

a detecting unit, configured to respectively detect a first path arrival time of a signal transmitted by the at least two base stations; and a calculating unit, configured to calculate a synchronization time difference according to a first path arrival time of the signals transmitted by the at least two base stations;

And a sending unit, configured to send the synchronization time difference to a serving base station of the terminal.

a detecting unit, configured to detect a frame header position of a signal transmitted by the base station;

a calculating unit, configured to calculate a synchronization time difference according to a frame header position of the signal transmitted by the base station; and a sending unit, configured to send the synchronization time difference to the macro base station.

According to another aspect of the present invention, in an executable manner, a communication system is provided, including a base station and any one of the communication devices provided by the embodiments of the present invention;

And a base station, configured to receive a synchronization time difference sent by the communications device.

In the embodiment of the present invention, the first path arrival time of the signal transmitted by the base station or the frame header position of the signal transmitted by the base station (ie, the synchronization point of the signal generated by the base station) is used, according to the first path arrival time of the signal transmitted by the base station or the signal transmitted by the base station. The frame header position calculates the synchronization time difference, and then sends the synchronization time difference to the detected base station, so that the base station can acquire the synchronization time difference between the base station and the base station having its own X2 interface, so that the related processing can be performed according to the synchronization time difference, for example. And improving the search performance of the cell, the interference coordination capability, and the like based on the synchronization time difference. The method for detecting the PSS/SSS information of the macro base station by the LPN proposed by the present invention obtains the time difference, and only transmits the time difference from the LPN to the macro base station, thereby saving signaling overhead. The present invention also proposes another method, that is, performing measurement from the UE side, and obtaining a first-path arrival time difference between the RSRP, the RSRQ, and the base station, and reporting it to the base station. DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings can also be obtained from those skilled in the art based on these drawings without paying any creative effort. 2a is a schematic diagram of a network scenario when a terminal calculates a synchronization time difference; FIG. 3a is a schematic diagram of a network scenario when a synchronization time difference is calculated by a low power node; FIG. 4a is a schematic structural diagram of a network device according to an embodiment of the present invention;

FIG. 4b is another schematic structural diagram of a network device according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without making creative labor are within the scope of the present invention.

Embodiments of the present invention provide a synchronization information acquisition method, apparatus, and system. The following is a detailed description. This embodiment is a method embodiment of the present invention. In this embodiment, it will be described from the perspective of a communication device, where the communication device may be a terminal or a low power node.

A method for acquiring a synchronization time difference, comprising: detecting a first path arrival time of a base station signal or a synchronization point of a signal generated by a base station; calculating a synchronization time difference according to a detected first path arrival time of the base station signal or a synchronization point of the base station generating a signal; The synchronization time difference is sent to the base station.

Referring to Figure 1, the specific process can be as follows:

Step 101: Detect a first path arrival time of a signal transmitted by a base station or a synchronization point of a signal generated by a base station

(The synchronization point at which the base station generates a signal refers to the position of the frame header of the signal transmitted by the base station); for example, it can be specifically:

The terminal respectively detects a first path arrival time of signals transmitted from at least two base stations; or The low power node obtains a synchronization point of the signal generated by the macro base station by detecting a primary synchronization signal (PSS, Primary Synchronization Signal) and a secondary synchronization signal (SSS) sent by the macro base station.

The first path arrival time refers to the time when the first path of the signal transmitted by the base station reaches the terminal, and the synchronization point generated by the macro base station refers to the frame header position of the signal transmitted by the macro base station.

Step 102: Calculate a synchronization time difference according to the detected first-path arrival time of the signal transmitted by the base station or the synchronization point of the signal generated by the base station; as follows:

For example, if the detecting function is completed by the terminal in step 101, then step 102 may specifically be:

The terminal compares the detected first-path arrival times of the signals transmitted by the at least two base stations to obtain a synchronization time difference. For example, if the base station 1 and the base station 2 are mutually adjacent base stations, the base station 1 and the base station 2 are located within the same coverage area. The terminal may detect the first path arrival time of the signal transmitted by the base station 1 and the first path arrival time of the signal transmitted by the base station 2, wherein the first path arrival time of the signal transmitted by the base station 1 is detected as 00:00:00:000 The first path arrival time of the signal transmitted by the base station 2 is 00:00:00:001, then the terminal compares the arrival times of the two first paths, and the synchronization time difference is lms (milliseconds).

For another example, if the detection function is performed by the low-power node in step 101, then step 102 may specifically be:

The low power node compares the obtained synchronization point of the signal generated by the macro base station with the synchronization point of the locally generated signal to obtain a synchronization time difference. For example, if the macro base station 1 and the low power node are mutually adjacent base stations, the low power node can acquire the synchronization point of the signal generated by the macro base station, for example, when the time of the macro base station is 00:00:00:000, the time of the low power node. It is 00:00:00:001. At this time, the low power node compares the two times to know that the synchronization time difference between the low power node and the macro base station is 1 ms.

Step 103: Send the synchronization time difference obtained in step 102 to the detected base station; for example, if in step 102, the synchronization time difference is calculated by the terminal, then step 103 may specifically be: :

The terminal carries the synchronization time difference by adding a new message element (IE, Information Element) to the message reported by the terminal, so as to separately send the synchronization time difference to the two adjacent base stations. Alternatively, the terminal may also send the synchronization time difference to the two adjacent base stations detected by an independent message. or,

Step 103 may specifically be: the terminal sends the obtained synchronization time difference to the service base station of the terminal, or

The terminal transmits the obtained synchronization time difference to the serving base station of the terminal. For example, the terminal may send the synchronization time difference to the serving base station of the terminal by using the message element IE for carrying the synchronization time difference in the message reported to the serving base station at the terminal. Alternatively, the terminal may also send the synchronization time difference to the serving base station of the terminal through an independent message.

Thereafter, the serving base station that obtains the synchronization time difference can also transmit the synchronization time difference to other base stations through the X2 interface.

For another example, if the synchronization time difference is calculated by the low power node in step 102, then step 103 may specifically be:

The low power node sends the calculated synchronization time difference to the macro base station through the X2 port. For example, the low power node may send the synchronization time difference through the message element IE for carrying the synchronization time difference in the signaling of the X2 port. Give the macro base station. details as follows:

A new IE is added to the signaling of the X2 port to carry the synchronization time difference, and then the low power node transmits the synchronization time difference to the macro base station through the new IE. Or,

The low power node can also send the synchronization time difference to the macro base station through the signaling of the newly defined X2 port.

The signaling of the X2 port may specifically be: an X2 setup request (X2 SETUP REQUEST), an X2 setup response (X2 SETUP RESPONSE), a base station configuration correction (ENB CONFIGURATION UPDATE), a base station configuration correction notification (ENB CONFIGURATION UPDATE ACKNOWLEDGE), a cell Activation request (CELL ACTIVATION REQUEST) or cell activation response (CELL ACTIVATION RESPONSE), and so on.

Of course, in order to save the signaling process, before sending the synchronization time difference to the base station, it is also possible to further determine whether the synchronization time difference is sent to the base station. If the synchronization time difference is so small that it can be ignored, the synchronization time difference may not be mentioned. If the synchronization time is large, the synchronization time difference needs to be sent to the base station, that is, before the synchronization time difference is sent to the base station, the synchronization time difference acquisition method may further include: Determine that the synchronization time difference is greater than the set synchronization time difference threshold.

The synchronization time difference threshold can be set according to the actual application requirements.

As can be seen from the above, in this embodiment, the first path arrival time of the signal transmitted by the base station or the synchronization point of the signal generated by the base station is used, and the synchronization time difference is calculated according to the first path arrival time of the signal transmitted by the base station or the synchronization point of the signal generated by the base station, and then The synchronization time difference is sent to the detected base station, so that the base station can acquire the synchronization time difference between itself and the neighboring base station (that is, the base station having the X2 interface with itself), so that the related processing can be performed according to the synchronization time difference, for example, based on This synchronization time difference improves the search performance of the cell, as well as interference coordination capabilities, and the like. This embodiment is another method embodiment provided by an embodiment of the present invention.

According to the method described in the foregoing embodiment, the following is a detailed description of the network device as a terminal.

Scenario: As shown in Figure 2a, base station 1 and base station 2 are adjacent base stations, and terminal A is located under the common coverage of base station 1 and base station 2. Referring to Figure 2b, the specific process can be as follows:

Step 201: Terminal A detects a first path arrival time of a signal from the base station 1 and a first path arrival time of the signal from the base station 2, respectively.

For example, the first path arrival time of the signal from the base station 1 detected by the terminal A is 00:00:00:000, and the first path arrival time of the signal from the base station 2 is 00:00:00:001.

Step 202: Terminal A compares the detected first path arrival time of the signal from the base station 1 with the first path arrival time of the signal from the base station 2, to obtain a synchronization time difference;

For example, in step 102, the first path arrival time of the signal from the base station 1 detected by the terminal A is 00:00:00:000, and the first path arrival time of the signal from the base station 2 is 00:00:00:001. At this time, terminal A can compare the arrival times of the two first paths, and calculate the difference between the two time points as 1 ms. Therefore, it can be concluded that the synchronization time difference between the base station 1 and the base station 2 is lms, Step 203: Step 203: The terminal A reports the obtained synchronization time difference to the base station 1 and the base station 2 together with the reference signal received power (RSRP, Reference Signal Receiving Power) and the reference signal received quality (RSRQ, Reference Signal Received Quality). The details can be as follows:

In the prior art, the terminal generally needs to measure the parameters such as the RSRP and the RSRQ of the serving base station, and then report the parameters to the serving base station. Therefore, the synchronization time difference obtained in step 202 can be carried in the reporting message of parameters such as RSRP and RSRQ. It is sent to base station 1 and base station 2. For example, you can pass A new IE is added to the message reported by the terminal to carry the synchronization time difference to be reported. For example, in the MeasConfig information element, a new IE can be added to carry the synchronization time difference that needs to go to work.

It should be noted that the terminal A can also report the obtained synchronization time difference to the serving base station of the terminal together with the reference signal received power and the reference signal receiving quality, and then transmitted by the serving base station to the other base stations through the X2 interface, where Narration.

Optionally, in order to save the signaling process, before step 203, the size of the synchronization time difference obtained in step 202 may also be determined, as follows:

The terminal A determines whether the synchronization time difference is greater than the set synchronization time difference threshold. If yes, step 203 is performed; otherwise, the process ends.

For example, the threshold value of the synchronization time difference may be set to 200 μs (microseconds). Then, if the synchronization time difference obtained in step 202 is lms, the terminal A needs to send the synchronization time difference to the base station 1 and the base station 2 ( That is, step 203) is performed, but if the obtained synchronization time difference is 2.5 μs in step 202, the terminal Α may not transmit the synchronization time difference to the base station 1 and the base station 2 (ie, step 203 is not performed), and so on. and many more.

As can be seen from the above, in this embodiment, the terminal A detects the first path arrival time of the signals transmitted by the at least two base stations, and then calculates the synchronization time difference according to the first path arrival time of the signals transmitted by the at least two base stations, and then synchronizes the time difference. The base station 1 and the base station 2 are sent to the detected base station 1 and the base station 2, so that the base station 1 and the base station 2 can obtain the synchronization time difference between themselves and the neighboring base station (that is, the base station having the X2 interface with itself), so that the synchronization time difference can be subsequently performed according to the synchronization time difference. Correlation processing, for example, improves the search performance of the cell based on the synchronization time difference, as well as interference coordination capability, and the like. This embodiment is another method embodiment provided by an embodiment of the present invention.

In a heterogeneous network, although the low-power node itself acts as a base station, it can also be regarded as a receiver, which can receive the primary synchronization signal (PSS, Primary Synchronization Signal) and secondary synchronization sent by the macro base station. Signal (SSS, Secondary Synchronization Signal). Therefore, the communication device can also be a low power node.

In this embodiment, the specific low power point of the communication device will be described as an example.

Scenario: As shown in FIG. 3a, the low power node 1 and the macro base station 2 are neighboring base stations, and the low power node 1 is located within the coverage of the macro base station 2 (ie, the signal of the macro base station 2 can be received), see Figure 3b, the specific process can be as follows:

Step 301: The low power node 1 obtains a synchronization point of the signal generated by the macro base station 2 by detecting the primary synchronization signal and the secondary synchronization signal transmitted by the macro base station 2. For example, the time point at which the low power node 1 detects the primary synchronization signal or the secondary synchronization signal sent by the macro base station 2 is: 00:00:00:000 (ie, the synchronization point of the signal generated by the macro base station 2 is: 00:00:00: 000); At this time, the low power node 1 itself time point is: 00:00:00:001 (that is, the synchronization point of the locally generated signal is: 00:00:00:001), then the low power node 1 according to these two Step 302 is performed at each time point.

Step 302: The low power node 1 compares the obtained synchronization point of the signal generated by the macro base station 2 with the synchronization point of the locally generated signal to obtain a synchronization time difference.

For example, in step 301, the low power node 1 detects that the synchronization point of the signal generated by the macro base station 2 is 00:00:00:000, and the synchronization point of the signal generated locally by the low power node 1 is: 00:00:00:001 Then, comparing the two synchronization points, the time difference between the two is 1 ms. Therefore, the synchronization time difference can be obtained as lms, and then step 303 is performed.

Step 303: The low-power node 1 sends the obtained synchronization time difference to the macro base station 2 through the X2 port. For example, a new IE may be added to the signaling of the X2 port to carry the synchronization time difference, where the X2 port letter The specifics may be: X2 setup request, X2 setup response, base station configuration correction, base station configuration correction notification, cell activation request or cell activation response, and the like.

Optionally, in order to save the signaling process, before step 303, the synchronization time difference obtained in step 302 may also be determined, as follows:

The low power node 1 determines whether the synchronization time difference is greater than the set synchronization time difference threshold. If yes, step 303 is performed; otherwise, the process ends.

For example, the threshold value of the synchronization time difference can be set to 200 μ s. Then, if the synchronization time difference obtained in step 302 is lms, the low power node 1 needs to send the synchronization time difference to the macro base station 2 (ie, step 303 is performed). ), but if the obtained synchronization time difference is 2.5 μs in step 202, the low power node 1 may not transmit the synchronization time difference to the macro base station 2 (ie, does not perform step 303), and so on, and so on.

As can be seen from the above, in this embodiment, the synchronization point of the signal generated by the macro base station is detected by the low power node 1, and then the synchronization time difference is calculated according to the synchronization point of the signal generated by the macro base station, and the synchronization time difference is transmitted to the detected macro base station 2 So that the macro base station 2 can acquire the synchronization time difference between itself and the neighboring base station, so that the related processing can be performed according to the synchronization time difference, for example, based on This synchronization time difference improves the search performance of the cell, as well as interference coordination capabilities, and the like. The above method for obtaining the synchronization time difference can be specifically applied to the cell search method and the interference coordination method to provide system performance. For example, after the base station obtains the synchronization time difference, the base station can select a suitable blank frame mode to send to the terminal according to the synchronization time difference, so that the cell search time can be shortened compared to the randomly selected blank frame sent to the terminal, thereby saving the power of the terminal. Improve system performance, and so on, so I won't go into details here.

In an embodiment, the terminal respectively detects the first path arrival time of the signals from the plurality of base stations; the terminal compares the detected multiple path arrival times by two to obtain a synchronization time difference between any two base stations; for example, located at The base station 1, the base station 2, and the base station 3 can detect the first arrival time of the signal of the base station 1, the first arrival time of the signal of the base station 2, and the first arrival time of the signal of the base station 3, respectively. The first path arrival time of the signal of the base station 1 is detected as 00: 00: 00: 000, the first path arrival time of the signal of the base station 2 is 00: 00: 00: 001, and the first path arrival time of the signal of the base station 3 is 00 :00:00:002, then the terminal compares the arrival times of the three first-paths in pairs, and the synchronization time difference between the base station 1 and the base station 2 is lms (milliseconds), and the synchronization between the base station 1 and the base station 3 The time difference is 2 ms, and the synchronization time difference between the base station 2 and the base station 3 is lms; the terminal transmits the obtained synchronization time difference between the two base stations to the corresponding two base stations respectively; for example, Transmitting the synchronization time difference between the base station 1 and the base station 2 obtained in step 102 to the base station 1 and the base station 2, respectively, and transmitting the synchronization time difference between the base station 1 and the base station 3 obtained in step 102 to the base station 1 and the base station 3, respectively. And transmitting the synchronization time difference between the base station 2 and the base station 3 obtained in step 102 to the base station 2 and the base station 3, respectively.

The base station selects an appropriate transmission format to transmit almost blank subframes according to the synchronization time difference between the base station and other base stations, thereby improving cell search performance and achieving system optimization. This embodiment is an apparatus embodiment provided by an embodiment of the present invention.

Correspondingly, the embodiment of the present invention further provides a communication device. Referring to FIG. 4a, the communication device includes a detecting unit 401, a calculating unit 402, and a sending unit 403.

The detecting unit 401 is configured to detect a first path arrival time of a signal transmitted by the base station or a frame head position of the signal transmitted by the base station (that is, a synchronization point at which the base station generates a signal);

The calculating unit 402 is configured to calculate a synchronization time difference according to the first path arrival time of the signal transmitted by the base station detected by the detecting unit 401 or the frame head position of the signal transmitted by the base station;

The sending unit 403 is configured to send the synchronization time difference obtained by the calculating unit 402 to the detected base station.

The communication device may specifically be as follows:

(One) The detecting unit 401 is specifically configured to separately detect a first path arrival time of the signals transmitted by the at least two base stations;

The calculating unit 402 is configured to calculate a synchronization time difference according to the first path arrival time of the signals transmitted by the at least two base stations obtained by the detecting unit 401, for example, the detected first path arrival times of the signals transmitted by the at least two base stations may be compared, Get the synchronization time difference;

For example, if the base station 1 and the base station 2 are mutually adjacent base stations, the detection unit 401 of the terminal located in the coverage area of the base station 1 and the base station 2 can respectively transmit the first path arrival time of the signal transmitted by the base station 1 and the signal transmitted by the base station 2. The first path arrival time is detected, wherein the first path arrival time of the signal transmitted by the base station 1 is detected as 00:00:00:000, and the first path arrival time of the signal transmitted by the base station 2 is 00:00:00:001. Then, the calculation unit 402 of the terminal compares the arrival times of the two first paths, and the synchronization time difference is lms (milliseconds).

The sending unit 403 is specifically configured to send the synchronization time difference obtained by the calculating unit 402 to the serving base station of the terminal, or may send the synchronization time difference obtained by the calculating unit 402 to the detected two base stations. For example, the synchronization time difference may be carried by adding a new IE to the message reported by the terminal, that is,

The sending unit 403 is specifically configured to send the synchronization time difference to the serving base station of the terminal by using a message element IE for carrying the synchronization time difference in the message of the serving base station on the terminal. Or,

The sending unit 403 may be specifically configured to carry a synchronization time difference by adding a new IE to the message on the terminal, so as to separately send the synchronization time difference to the detected two base stations.

It should be noted that, if the sending unit 403 sends the synchronization time difference obtained by the calculating unit 402 to the serving base station of the terminal, the serving base station that obtains the synchronization time difference can subsequently transmit the synchronization time difference to other base stations through the X2 interface.

In this case, the communication device may specifically be a terminal or other device having similar functions to the terminal. (2)

The detecting unit 401 is specifically configured to detect a frame header position of the signal transmitted by the base station, for example, specifically, by detecting a primary synchronization signal PSS and a secondary synchronization signal SSS sent by the macro base station, to obtain a synchronization point of the signal generated by the macro base station;

The calculating unit 402 is specifically configured to calculate a synchronization time according to a frame header position of a signal transmitted by the base station For example, if the detecting unit 401 detects the synchronization point of the signal generated by the macro base station by detecting the primary synchronization signal PSS and the secondary synchronization signal SSS transmitted by the macro base station, the calculation unit 402 can generate the signal of the obtained macro base station. The synchronization point is compared with the synchronization point of the locally generated signal to obtain a synchronization time difference;

For example, if the macro base station and the low power node are mutually adjacent base stations, the detecting unit 401 of the low power node can acquire the synchronization point of the signal generated by the macro base station, for example, when the time of the macro base station is 00:00:00:000, the low power The time of the node is 00:00:00:001. Then, the calculation unit 402 of the low power node compares the two times, and the synchronization time difference between the low power node and the macro base station 1 is 1 ms.

The sending unit 403 is specifically configured to send the synchronization time difference to the macro base station. For example, the synchronization time difference may be sent to the macro base station through the X2 port. For example, the synchronization time difference can be specifically added by adding a new IE to the signaling of the X2 port, that is,

The sending unit 403 is specifically configured to send the synchronization time difference to the macro base station by using a message element IE for carrying the synchronization time difference in signaling of the X2 port.

At this time, the communication device may specifically be a low power node or other device having similar functions to the low power node.

Optionally, in order to save the signaling process, before sending the synchronization time difference to the base station, whether it is necessary to send the synchronization time difference to the base station for further determination, if the synchronization time difference is so small that it can be ignored, The synchronization time difference is sent to the base station, otherwise, if the synchronization time is large, the synchronization time difference needs to be sent to the base station, as shown in Figure 4b, the communication device may further include a determining unit 404;

The determining unit 404 is configured to determine whether the synchronization time difference is greater than the set synchronization time difference threshold. The sending unit 403 is configured to: when the determining unit 404 determines that the synchronization time difference is greater than the set synchronization time difference threshold, send the synchronization time difference to the base station, For example, the synchronization time difference is transmitted to the serving base station of the terminal, or the synchronization time difference is transmitted to the macro base station, and the like.

If the determining unit 404 determines that the synchronization time difference is not greater than the set synchronization time difference threshold, the transmitting unit 403 may not transmit the synchronization time difference to the base station.

For the specific implementation of the above various units, refer to the foregoing method embodiments, and details are not described herein again. In the specific implementation, each of the above units may be implemented as a separate entity, or may be implemented in any combination as one or several entities. As can be seen from the above, the detecting unit 401 of the communication device of this embodiment can detect the first path arrival time of the signal transmitted by the base station or the frame header position of the signal transmitted by the base station, and then the calculating unit 402 according to the first path arrival time of the signal transmitted by the base station. Or the frame header position of the signal transmitted by the base station calculates a synchronization time difference, and finally the transmitting unit 403 sends the synchronization time difference to the detected base station, so that the base station can acquire itself and the neighboring base station (ie, the base station having the X2 interface with the base station) The synchronization time difference between the two is such that the correlation processing can be performed according to the synchronization time difference, for example, improving the search performance of the cell based on the synchronization time difference, and the interference coordination capability, and the like. This embodiment is a system embodiment provided by an embodiment of the present invention.

Correspondingly, the embodiment of the present invention further provides a communication system, including any communication device provided by the embodiment of the present invention. In addition, the communication system may further include a base station;

a communication device, configured to detect a first-path arrival time of a signal transmitted by the base station or detect a frame header position of the signal transmitted by the base station (ie, detect a synchronization point at which the base station generates a signal), according to the detected first-path arrival time of the signal transmitted by the base station or Calculating a synchronization time difference by a frame header position of a signal transmitted by the base station, and transmitting a synchronization time difference to the base station;

After receiving the synchronization time difference, the base station may perform correlation processing based on the synchronization time difference, for example, improving the search performance of the cell based on the synchronization time difference, and the interference coordination capability, and the like.

For details, refer to the foregoing device embodiments, and details are not described herein again.

For example, the base station may specifically include a first base station and a second base station, and the communication device is specifically a terminal, that is, the communication system may include a first base station, a second base station, and a terminal;

a first base station, configured to receive a synchronization time difference sent by the terminal;

a second base station, configured to receive a synchronization time difference sent by the terminal;

a terminal, configured to respectively detect a first path arrival time of a signal from the first base station, and a first path arrival time of the signal from the first base station, and compare the detected arrival times of the two first paths to obtain a synchronization time difference, which will be obtained. The synchronization time difference is sent to the first base station and the second base station, respectively.

The terminal may carry the synchronization time difference by adding a new IE to the message on the terminal, so that the synchronization time difference is separately sent to the first base station and the second base station.

For another example, the base station may be a macro base station, and the communication device is specifically a low power node, that is, the communication system may include a macro base station and a terminal; a macro base station, configured to receive a synchronization time difference sent by the low power node;

a low power node, configured to detect a synchronization point of a signal generated by the macro base station by detecting a primary synchronization signal and a secondary synchronization signal sent by the macro base station, and compare the synchronization point of the generated signal generated by the macro base station with a synchronization point of the locally generated signal, The synchronization time difference is sent to the macro base station through the X2 port.

For example, a new IE may be added to the signaling of the X2 port to carry the synchronization time difference, so as to send the synchronization time difference to the macro base station. The signaling of the X2 port may specifically include an X2 establishment request, an X2 establishment response, a base station configuration correction, a base station configuration correction notification, a cell activation request, or a cell activation response, and the like.

For the specific implementation of the foregoing devices, refer to the foregoing embodiments, and details are not described herein again.

It can be seen that the communication device in the communication system of this embodiment can detect the first path arrival time of the signal transmitted by the base station or the frame header position of the signal transmitted by the base station, and then according to the first path arrival time of the signal transmitted by the base station or the base station transmits the time. The frame header position of the signal calculates a synchronization time difference, and sends the synchronization time difference to the detected base station, so that the base station can acquire the synchronization time difference between itself and the neighboring base station (ie, the base station having the X2 interface with itself), so that the subsequent time can be Correlation processing is performed according to the synchronization time difference, for example, improving the search performance of the cell based on the synchronization time difference, and the interference coordination capability, and the like. A person of ordinary skill in the art may understand that all or part of the steps of the foregoing embodiments may be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: Read Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.

The foregoing description of the method, apparatus, and system for synchronizing information provided by the embodiments of the present invention is only for helping to understand the method and core idea of the present invention. Meanwhile, for those skilled in the art, according to the present invention, The present invention is not limited by the scope of the present invention.

Claims

Claim

A method for acquiring a synchronization time difference, comprising:

Calculating a synchronization time difference according to a first path arrival time of the signals transmitted by the at least two base stations; and transmitting the synchronization time difference to a serving base station of the terminal.

The method according to claim 1, wherein the sending the synchronization time difference to the serving base station of the terminal comprises:

The terminal sends the synchronization time difference to the serving base station of the terminal by using the message element IE for carrying the synchronization time difference in the message reported to the serving base station at the terminal.

The method according to claim 1 or 2, wherein before the sending the synchronization time difference to the serving base station of the terminal, the method further includes:

It is determined that the synchronization time difference is greater than a set synchronization time difference threshold.

4. A method for acquiring a synchronization time difference, which is characterized by comprising:

Detecting a frame header position of a signal transmitted by the base station;

The synchronization time difference is transmitted to the macro base station.

5. The method of claim 4, wherein

The detecting a frame header position of the signal transmitted by the base station includes: the low power node detects a synchronization point generated by the macro base station by detecting the primary synchronization signal PSS and the secondary synchronization signal SSS sent by the macro base station;

Calculating the synchronization time difference according to the frame header position of the signal transmitted by the base station, comprising: the low power node comparing the synchronization point of the obtained macro base station generated signal with the synchronization point of the locally generated signal to obtain a synchronization time difference;

The transmitting the synchronization time difference to the macro base station includes: transmitting, by the low power node, the synchronization time difference to the macro base station through the X2 port.

The method according to claim 5, wherein the low power node sends the synchronization time difference to the macro base station through the X2 port, including:

The low power node transmits the synchronization time difference to the macro base station by using a message element IE for carrying the synchronization time difference in signaling of the X2 port.

The method according to claim 6, wherein the signaling of the X2 port comprises: X2 setup request, X2 setup response, base station configuration correction, base station configuration correction notification, cell activation request, or cell activation response.

The method according to any one of claims 4 to 7, wherein before the sending the synchronization time difference to the macro base station, the method further includes:

9. A communication device, comprising:

a detecting unit, configured to respectively detect a first-path arrival time of the signals transmitted by the at least two base stations; and a calculating unit, configured to calculate a synchronization time difference according to a first-path arrival time of the signals transmitted by the at least two base stations detected by the detecting unit;

And a sending unit, configured to send the synchronization time difference calculated by the calculating unit to the serving base station of the terminal.

10. The communication device according to claim 9, wherein:

The sending unit is specifically configured to send the synchronization time difference to the serving base station of the terminal by using a message element IE for carrying the synchronization time difference calculated by the calculating unit in the message reported by the terminal to the serving base station.

The communication device according to claim 9 or 10, further comprising: a determining unit, configured to determine whether the synchronization time difference is greater than a set synchronization time difference threshold; when the time difference threshold is The synchronization time difference is sent to the serving base station of the terminal.

12. A communication device according to claim 9 or 10, characterized in that

The communication device is specifically a terminal.

13. A communication device, comprising:

a calculating unit, configured to calculate a synchronization time difference according to a frame header position of a signal transmitted by the base station detected by the detecting unit;

And a sending unit, configured to send, to the macro base station, the synchronization time difference calculated by the calculating unit.

14. The communication device of claim 13 wherein:

The detecting unit is specifically configured to obtain a synchronization point of a signal generated by the macro base station by detecting a primary synchronization signal PSS and a secondary synchronization signal SSS sent by the macro base station; The calculating unit is specifically configured to compare a frame header position of the generated signal generated by the obtained macro base station with a frame header position of the locally generated signal to obtain a synchronization time difference;

The sending unit is specifically configured to send, by using the X2 port, the synchronization time difference calculated by the calculating unit to the macro base station.

15. The communication device according to claim 14, wherein:

The sending unit is specifically configured to send the synchronization time difference to the macro base station by using a message element IE for carrying the synchronization time difference in signaling of the X2 port.

The network device according to any one of claims 13 to 15, further comprising a determining unit;

a determining unit, configured to determine whether the synchronization time difference is greater than a set synchronization time difference threshold; and the sending unit is configured to: when the determining unit determines that the synchronization time difference is greater than a set synchronization time difference threshold, The time difference is sent to the macro base station.

The network device according to any one of claims 13 to 15, wherein the communication device is specifically a low power node.

A communication system, comprising: a base station and the communication device according to any one of claims 9 to 17;