WO2015113286A1

WO2015113286A1 - Method and device for clock synchronization

Info

Publication number: WO2015113286A1
Application number: PCT/CN2014/071816
Authority: WO
Inventors: 范霄安; 万蕾; 郑娟; 马莎; 夏媛
Original assignee: 华为技术有限公司
Priority date: 2014-01-29
Filing date: 2014-01-29
Publication date: 2015-08-06
Also published as: CN105009656A

Abstract

Provided are a method and device for clock synchronization. The method comprises: a second base station receives a clock synchronization state of at least a first base station, the second base station determines a synchronization source base station on the basis of the clock synchronization state of the first base station; and, the second base station synchronizes on the basis of clock information of the synchronization source base station, where the clock synchronization state comprises whether or not clock synchronization is reliable and/or a clock synchronization type, and the clock synchronization type of the first base station comprises at least one among a clock synchronization source of the first base station, an operator to which the first base station belongs, a base station type of the first base station, and an identity of the first base station. The provided method and device for clock synchronization are capable of ensuring the accuracy of clock synchronization.

Description

Clock synchronization method and device

Technical field

The present invention relates to communication technologies, and in particular, to a clock synchronization method and apparatus. Background technique

In the communication system, in order to ensure normal data transmission between the macro base station and each micro base station and between each micro base station, clock peers need to be implemented between each micro base station and between the micro base station and the macro base station. Clock peers include time peers and / or frequency peers. When the frequency is the same between the micro base stations and the micro base station and the macro base station, it means that the frequency error of each micro base station or macro base station is within a set threshold range; when each micro base station and the micro base station and the macro base station The time synchronization is the deviation between the transmission timings of the micro base stations, or the deviation between the reception timings of the respective micro base stations and the reception timings of the same user equipment, or the transmission timing of each micro base station and the macro base station. The deviation between the micro base stations and the macro base station transmission timing reaches the reception timing of the same user equipment end within a set threshold range. In the prior art, the clock peer is realized by network listening, that is, a part of the micro base station obtains the clock peer through the clock homonym signal provided by the external source, and provides the same as the other source. The clock homologous signal enables other micro base stations to also implement clock coherence, that is, inter-station peers. Among them, the external source can be: Global Navigation Satellite System (GNSS), such as Global Positioning System (GPS), wired network clock, macro base station with overlapping base area with micro base station, etc. .

FIG. 1 is a schematic structural diagram of a multi-hop peer system. In order to identify the peer state of each micro base station, the peer level of each micro base station is predetermined, and the scenario of multi-hop peer is particularly common under densely deployed micro base stations. As can be seen from FIG. 1, the macro base station acquires the timing information by using the Global Positioning System (GPS), that is, sets the peer level to 0; the micro base station 1 obtains the timing information through the macro base station, that is, The peer class is set to 1; the micro base station 2 obtains the timing peer information through the micro base station 1, that is, the peer class is set to 2; FIG. 1 shows a 3-hop peer system. The micro base station M in FIG. 1 is an isolated base station. When the micro base station M-1 obtains peer information through the isolated micro base station M, it is easy to guide. To the same level is not accurate.

Generally, a peer base station is required to determine the same source base station by receiving the strength of the signal transmitted by other base stations and/or the peer class of other base stations. For example, the peer base station may determine the signal transmitting base station that corresponds to the strongest received signal as the same source base station.

However, this peer-to-peer method of the prior art, since some base stations belong to isolated base stations, and do not need to consider the relationship with other base stations, the clocks of such base stations are freely configured, timing reference point randomness. Larger. If the peer base station determines such a base station as the same source base station, it will result in inaccurate peers. More seriously, in a multi-hop peer system, if the peer base station is inaccurate, it will serve as the same source base station of other base stations, resulting in infinite error propagation of the clock peer error, resulting in the error of the clock peer. control. Summary of the invention

Embodiments of the present invention provide a clock synchronization method and apparatus to ensure the accuracy of clock peers. In a first aspect, an embodiment of the present invention provides a clock peer device, including: a receiving module, configured to receive a clock peer state of at least one first base station;

a determining module, configured to determine a peer base station according to a clock peer state of the first base station; and a peer module, configured to perform a peer according to clock information of the same source base station;

The clock peer state includes whether the clock peer is reliable and/or the clock peer type. The clock peer type of the first base station includes a clock peer source of the first base station, a carrier of the first base station slave, At least one of a base station type of the first base station and an identity of the first base station.

In a first possible implementation manner of the first aspect, the receiving module is specifically configured to: receive a clock peer state of the first base station by means of air interface signaling.

In a second possible implementation manner of the first aspect, the receiving module is specifically configured to: receive a clock peer state of the first base station by using a backhaul link backhaul; or receive the a clock peer state of the first base station, where the clock peer state of the first base station is reported by the first base station to the centralized controller; or

Receiving, by the macro base station, a clock peer state of the first base station, where a clock peer state of the first base station is reported by the first base station to the macro base station.

According to the first aspect, the first or the second possible implementation of the first aspect, in a third possible implementation, the receiving module is specifically configured to: Receiving a cell identifier of at least one first base station;

Determining a clock peer state of the first base station according to the cell identifier of the first base station and a first preset rule.

According to a first possible implementation manner of the first aspect, in a fourth possible implementation, the receiving module is specifically configured to:

Receiving a primary peer sequence PSS and/or a secondary sequence SSS sent by the first base station;

According to the main colleague sequence? The 88 and/or the secondary sequence SSS and the sixth preset rule determine the cell identity of the first base station.

According to a first possible implementation manner of the first aspect, in a fifth possible implementation, the receiving module is specifically configured to:

Receiving a sequence sent by the first base station, and determining a clock peer state of the first base station according to the sequence and the second preset rule.

According to a fifth possible implementation manner of the first aspect, in a sixth possible implementation, the receiving module is specifically configured to:

The second base station receives the primary synchronization sequence sent by the first base station? 88 and / or auxiliary sequence

SSS, and at least one sequence, the transmission time position of the sequence having a preset time interval between the PSS or the SSS transmission time position, and/or the transmission frequency position of the sequence and the PSS or There is a preset frequency interval between the SSS transmission frequency positions.

According to the sixth or seventh possible implementation of the first aspect, in a seventh possible implementation, the receiving module is specifically configured to:

Determining a clock state of the first base station according to a format of the sequence and a third preset rule.

According to the first possible implementation manner of the first aspect, in an eighth possible implementation, the receiving module is specifically configured to:

Reading a preset bit in the physical broadcast channel PBCH sent by the first base station;

Determining a clock peer state of the first base station according to a preset bit in the PBCH and a fourth preset rule.

According to a first possible implementation manner of the first aspect, in a ninth possible implementation manner, the receiving module is specifically configured to:

Reading a peer level sent by the first base station in a physical layer channel; Determining a clock peer state of the first base station according to the peer level and a fifth preset rule. According to a first possible implementation manner of the first aspect, in a tenth possible implementation, the receiving module is specifically configured to:

And receiving, by the uplink transmission channel, a clock peer state of the first base station sent by the UE, where a clock source peer state of the first base station is sent by the first base station to the UE by using a physical layer channel.

According to the ninth or the tenth possible implementation manner of the first aspect, in the eleventh possible implementation manner, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a bearer system The channel of the information block SIB, the paging channel, the physical downlink control channel PDCCH, the enhanced physical downlink control channel EPDCCH, and the physical downlink shared channel PDSCH.

In a second aspect, an embodiment of the present invention provides a clock synchronization device, including:

a determining module, configured to determine a clock peer state of the first base station, where a clock peer state of the first base station includes a clock peer of the first base station is reliable and/or a clock peer type, the clock of the first base station The peer type includes at least one of a clock peer source of the first base station, an operator of the first base station slave, a base station type of the first base station, and an identity of the first base station;

a sending module, configured to send a clock peer state of the first base station to the second base station, so that the second base station determines the same source base station according to the clock peer state of the first base station, and according to the first base station The clock information is peered.

In a first possible implementation manner of the second aspect, the sending module is specifically configured to: send, by using air interface signaling, a clock peer state of the first base station.

In a second possible implementation manner of the second aspect, the sending module is specifically configured to: send a clock peer state of the first base station by using a backhaul link; or: set a clock of the first base station The peer state is reported to the centralized controller, so that the centralized controller sends the clock peer state of the first base station to the second base station; or

The clock peer state of the first base station is reported to the macro base station, so that the macro base station sends the clock peer state of the first base station to the second base station.

According to the second aspect, the first or the second possible implementation of the second aspect, in a third possible implementation, the sending module is specifically configured to:

And sending, by the second base station, the cell identifier of the first base station, so that the second base station determines, according to the cell identifier of the first base station, a first preset rule that the clock of the first base station is the same State.

According to a first possible implementation manner of the second aspect, in a fourth possible implementation, the sending module is specifically configured to:

Determining the main synchronic sequence PSS and/or the auxiliary synchronizing sequence SSS according to its own clock peer state and the sixth preset rule;

Transmitting, by the second base station, the primary synchronic sequence PSS and/or the secondary synchronizing sequence SSS, so that the second base station determines, according to the primary synchronic sequence PSS and/or the auxiliary synchronizing sequence SSS The cell identity of the first base station.

According to the first possible implementation manner of the second aspect, in a fifth possible implementation, the sending module is specifically configured to:

Determining at least one sequence according to its own clock peer state and a second preset rule;

The sequence is sent by means of air interface signaling, so that the second base station determines a clock peer state of the first base station according to the sequence and the second preset rule.

According to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, the sending time position of the sequence has a preset time interval between the PSS or the SSS sending time position And / or a transmission frequency position of the sequence having a preset frequency interval between the PSS or the SSS transmission frequency position;

The sending module is specifically configured to:

Transmitting the primary synchronic sequence PSS and/or the auxiliary synchronizing sequence SSS to the second base station, and at least one of the sequences.

According to the sixth or seventh possible implementation of the second aspect, in a seventh possible implementation, the sending module is specifically configured to:

Determining a format of the sequence according to its own clock peer state and a third preset rule; transmitting the sequence to the second base station according to the format, so that the second base station determines, according to the format of the sequence The clock peer state of the first base station.

According to the first possible implementation manner of the second aspect, in the eighth possible implementation, the sending module is specifically configured to:

Carrying its own clock peer state in a preset bit in the physical broadcast channel PBCH; transmitting the physical broadcast channel PBCH to the second base station, so that the second base station is pre-prescribed according to the physical broadcast channel PBCH Setting the bit and the fourth preset rule to determine the time of the first base station Zhong Tong’s status.

According to a first possible implementation manner of the second aspect, in a ninth possible implementation manner, the sending module is specifically configured to:

Determining the peer level of the first base station according to its own clock peer state and a fifth preset rule;

And transmitting, by the physical layer channel, the peer level of the first base station to the second base station, so that the second base station determines the clock of the first base station according to the peer level and the fifth preset rule. Peer status.

According to a first possible implementation manner of the second aspect, in a tenth possible implementation, the sending module is specifically configured to:

Sending, by the physical layer channel, the clock peer state of the first base station to the UE, so that the UE sends the clock peer state of the first base station to the second base station by using an uplink transport channel.

According to the ninth or the tenth possible implementation manner of the second aspect, in the eleventh possible implementation, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a bearer system The channel of the information block SIB, the paging channel, the physical downlink control channel PDCCH, the enhanced physical downlink control channel EPDCCH, and the physical downlink shared channel PDSCH.

In a third aspect, an embodiment of the present invention provides a base station, including:

a receiver, configured to receive a clock peer state of the at least one first base station,

a processor, configured to determine a peer-to-peer base station according to a clock peer state of the first base station; the processor is further configured to perform a peer according to the clock information of the same source base station;

In a first possible implementation manner of the third aspect, the receiver is specifically configured to: receive a clock peer state of the first base station by means of air interface signaling.

In a second possible implementation manner of the third aspect, the receiver is specifically configured to: receive a clock peer state of the first base station by using a backhaul link; or receive, by using a centralized controller, the first a clock peer state of a base station, wherein a clock peer state of the first base station is reported by the first base station to the centralized controller; or

Receiving, by the macro base station, a clock peer state of the first base station, where the clock of the first base station is the same The 歩 state is reported by the first base station to the macro base station.

According to the third aspect, the first or the second possible implementation manner of the third aspect, in a third possible implementation manner, the receiver is specifically configured to:

Receiving a cell identifier of at least one first base station;

According to a first possible implementation manner of the third aspect, in a fourth possible implementation, the receiver is specifically configured to:

According to a first possible implementation manner of the third aspect, in a fifth possible implementation, the receiver is specifically configured to:

Receiving a sequence of transmissions by the first base station, and determining a clock peer state of the first base station according to the sequence and the second preset rule.

According to a fifth possible implementation manner of the third aspect, in a sixth possible implementation, the receiver is specifically configured to:

Receiving a primary synchronization sequence PSS and/or a secondary synchronization sequence SSS sent by the first base station, and at least one sequence, and a preset between a transmission time position of the sequence and a time position of the PSS or the SSS transmission The time interval, and/or the transmission frequency position of the sequence has a preset frequency interval from the PSS or the SSS transmission frequency position.

According to the sixth or seventh possible implementation of the third aspect, in a seventh possible implementation, the receiver is specifically configured to:

According to a first possible implementation manner of the third aspect, in an eighth possible implementation, the receiver is specifically configured to:

Determining a clock peer state of the first base station according to a preset bit in the PBCH and a fourth preset rule. According to a first possible implementation manner of the third aspect, in a ninth possible implementation manner, the receiver is specifically configured to:

Reading a peer level sent by the first base station in a physical layer channel;

Determining a clock peer state of the first base station according to the peer level and a fifth preset rule. According to a first possible implementation manner of the third aspect, in a tenth possible implementation manner, the receiver is specifically configured to:

According to the ninth or the tenth possible implementation manner of the third aspect, in an eleventh possible implementation manner, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a bearer system The channel of the information block SIB, the paging channel, the physical downlink control channel PDCCH, the enhanced physical downlink control channel EPDCCH, and the physical downlink shared channel PDSCH.

In a fourth aspect, an embodiment of the present invention provides a clock peer base station, including:

a processor, configured to determine a clock peer state of the first base station, where a clock peer state of the first base station includes a clock peer of the first base station is reliable and/or a clock peer type, the clock of the first base station The peer type includes at least one of a clock peer source of the first base station, an operator of the first base station slave, a base station type of the first base station, and an identity of the first base station;

a transmitter, configured to send a clock peer state of the first base station to the second base station, so that the second base station determines the same source base station according to the clock peer state of the first base station, and according to the first base station The clock information is peered.

In a first possible implementation manner of the fourth aspect, the transmitter is specifically configured to: send, by using air interface signaling, a clock peer state of the first base station.

In a second possible implementation manner of the fourth aspect, the transmitter is specifically configured to: send a clock peer state of the first base station by using a backhaul link; or: set a clock of the first base station The peer state is reported to the centralized controller, so that the centralized controller sends the clock peer state of the first base station to the second base station; or

According to the fourth aspect, the first or second possible implementation of the fourth aspect, in the third In a possible implementation manner, the transmitter is specifically configured to:

And sending, by the second base station, the cell identifier of the first base station, so that the second base station determines, according to the cell identifier of the first base station, and the first preset rule, the clock state of the first base station.

According to a first possible implementation of the fourth aspect, in a fourth possible implementation, the transmitter is specifically configured to:

Sending the primary synchronizing sequence PSS and/or the secondary synchronizing sequence SSS to the second base station, so that the second base station is according to the main synchronizing sequence? The 88 and/or secondary sequence SSS determines the cell identity of the first base station.

According to a first possible implementation manner of the fourth aspect, in a fifth possible implementation, the transmitter is specifically configured to:

According to the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner, the sending time position of the sequence has a preset time interval between the PSS or the SSS sending time position And / or the transmission frequency position of the sequence has a preset frequency interval between the PSS or the SSS transmission frequency position.

The transmitter is specifically configured to:

According to the sixth or seventh possible implementation of the fourth aspect, in a seventh possible implementation, the transmitter is specifically configured to:

According to a first possible implementation of the fourth aspect, in an eighth possible implementation, the transmitter is specifically configured to: Carrying its own clock peer state in a preset bit in the physical broadcast channel PBCH; transmitting the physical broadcast channel PBCH to the second base station, so that the second base station is pre-prescribed according to the physical broadcast channel PBCH And setting a bit and a fourth preset rule to determine a clock peer state of the first base station.

According to a first possible implementation of the fourth aspect, in a ninth possible implementation, the transmitter is specifically configured to:

According to a first possible implementation of the fourth aspect, in a tenth possible implementation, the transmitter is specifically configured to:

According to the ninth or the tenth possible implementation manner of the foregoing aspect, in the eleventh possible implementation manner, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a bearer system The channel of the information block SIB, the paging channel, the physical downlink control channel PDCCH, the enhanced physical downlink control channel EPDCCH, and the physical downlink shared channel PDSCH.

In a fifth aspect, an embodiment of the present invention provides a clock synchronization method, including:

Receiving, by the second base station, a clock peer state of the at least one first base station,

The second base station determines the same source base station according to the clock peer state of the first base station;

The second base station performs the same according to the clock information of the same source base station;

In a first possible implementation manner of the fifth aspect, the receiving, by the second base station, a clock peer state of the at least one first base station includes:

The second base station receives the clock peer state of the first base station by means of air interface signaling. In a second possible implementation manner of the fifth aspect, the second base station receives at least one The clock peer state of a base station, including:

Receiving, by the second base station, a clock peer state of the first base station by using a backhaul link; or

The second base station receives the clock peer state of the first base station by using the centralized controller, and the clock peer state of the first base station is reported by the first base station to the centralized controller; or The second base station receives the clock peer state of the first base station by using the macro base station, and the clock peer state of the first base station is reported by the first base station to the macro base station.

According to the fifth aspect, the first or the second possible implementation manner of the fifth aspect, in a third possible implementation manner, the receiving, by the second base station, the clock peer state of the at least one first base station includes:

Receiving, by the second base station, a cell identifier of at least one first base station;

The second base station determines a clock peer state of the first base station according to the cell identifier of the first base station and a first preset rule.

According to the first possible implementation manner of the fifth aspect, in a fourth possible implementation, the receiving, by the second base station, the cell identifier of the at least one first base station includes:

SSS;

The second base station according to the primary peer sequence? The 88 and/or the secondary sequence SSS and the sixth preset rule determine the cell identity of the first base station.

According to the first possible implementation manner of the fifth aspect, in a fifth possible implementation manner, the receiving, by the second base station, the clock peer state of the first base station by using air interface signaling, The second base station receives the sequence of transmission of the first base station, and determines a clock peer state of the first base station according to the sequence and the second preset rule.

According to the fifth possible implementation manner of the fifth aspect, in a sixth possible implementation, the reading, by the second base station, the sequence of the sending of the first base station includes:

The second base station receives the primary synchronization sequence sent by the first base station? 88 and / or a secondary sequence SSS, and at least one sequence, the transmission time position of the sequence having a preset time interval between the PSS or the SSS transmission time position, and / or the transmission of the sequence There is a preset frequency interval between the frequency location and the PSS or the SSS transmission frequency location.

According to the sixth or seventh possible implementation of the fifth aspect, in a seventh possible implementation In the mode, the determining, by the second base station, the clock peer state of the first base station according to the sequence and the second preset rule, including:

The second base station determines a clock peer state of the first base station according to the format of the sequence and a third preset rule.

According to the first possible implementation manner of the fifth aspect, in an eighth possible implementation, the receiving, by the second base station, the clock peer state of the first base station by means of air interface signaling, including: The second base station reads a preset bit in the physical broadcast channel PBCH sent by the first base station;

The second base station determines a clock peer state of the first base station according to a preset bit in the PBCH and a fourth preset rule.

According to the first possible implementation manner of the fifth aspect, in a ninth possible implementation manner, the second base station, by using air interface signaling, to receive a clock source peer state of the first base station, includes: The second base station reads the peer class sent by the first base station in the physical layer channel; the second base station determines the clock peer state of the first base station according to the peer class and the fifth preset rule.

According to the first possible implementation manner of the fifth aspect, the receiving, by the second base station, the clock peer state of the first base station by means of air interface signaling, in the tenth possible implementation manner, The second base station receives the clock peer state of the first base station that is sent by the UE by using the uplink transmission channel, and the information of the clock peer state of the first base station is sent by the first base station to the UE by using a physical layer channel. .

According to the ninth or the tenth possible implementation manner of the fifth aspect, in the eleventh possible implementation, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a bearer system The channel of the information block SIB, the paging channel, the physical downlink control channel PDCCH, the enhanced physical downlink control channel EPDCCH, and the physical downlink shared channel PDSCH.

In a sixth aspect, an embodiment of the present invention provides a clock synchronization method, including:

The first base station determines its own clock peer state, and the clock peer state of the first base station includes whether the clock of the first base station is reliable and/or the clock type, and the clock of the first base station is the same. The type includes at least one of a clock peer source of the first base station, an operator of the first base station, a base station type of the first base station, and an identity of the first base station;

Transmitting, by the first base station, a clock peer state of the first base station to the second base station, so that the second base station The base station determines the same source base station according to the clock peer state of the first base station, and performs the same according to the clock information of the first base station.

In a first possible implementation manner of the sixth aspect, the sending, by the first base station, the clock peer state of the first base station to the second base station includes:

The first base station sends a clock peer state of the first base station by means of air interface signaling. In a second possible implementation manner of the sixth aspect, the first base station sends a clock peer state of the first base station to the second base station, including:

Transmitting, by the first base station, a clock peer state of the first base station by using a backhaul link; or

The first base station reports the clock state of the first base station to the centralized controller, so that the centralized controller sends the clock peer state of the first base station to the second base station; or The first base station reports the clock peer state of the first base station to the macro base station, so that the macro base station sends the clock peer state of the first base station to the second base station.

According to the sixth aspect, the first or the second possible implementation manner of the sixth aspect, in a third possible implementation manner, the first base station sends a clock peer of the first base station to a second base station Status, including:

The first base station sends the cell identifier of the first base station to the second base station, so that the second base station determines, according to the cell identifier of the first base station, and the first preset rule, that the first base station Clock peer status.

According to the first possible implementation manner of the sixth aspect, in a fourth possible implementation, the sending, by the first base station, the cell identifier of the first base station to the second base station includes:

Determining, by the first base station, a primary peer sequence PSS and/or a secondary sequence SSS according to its own clock peer state and a sixth preset rule;

The first base station sends the primary synchronization sequence to the second base station? 88 and/or the secondary sequence SSS, such that the second base station determines the cell identity of the first base station according to the primary peer sequence PSS and/or the secondary sequence SSS.

According to the first possible implementation manner of the sixth aspect, in a fifth possible implementation manner, the first base station sends a clock peer state of the first base station by means of air interface signaling, including: The first base station determines at least one sequence according to its own clock peer state and a second preset rule. The first base station sends the sequence by means of air interface signaling, so that the second base station determines a clock peer state of the first base station according to the sequence and the second preset rule.

According to the fifth possible implementation manner of the sixth aspect, in a sixth possible implementation manner, the sending time position of the sequence has a preset time interval between the PSS or the SSS sending time position And / or a transmission frequency position of the sequence having a preset frequency interval between the PSS or the SSS transmission frequency position;

Sending, by the first base station, the sequence by means of air interface signaling, including:

The first base station sends the primary synchronization sequence to the second base station? 88 and / or a secondary sequence SSS, and at least one of said sequences.

According to the sixth or the seventh possible implementation manner of the sixth aspect, in a seventh possible implementation manner, the first base station sends a clock peer state of the first base station by using air interface signaling, Includes:

Determining, by the first base station, the format of the sequence according to its own clock peer state and a third preset rule;

And transmitting, by the first base station, the sequence to the second base station according to the format, so that the second base station determines a clock peer state of the first base station according to a format of the sequence.

According to the first possible implementation manner of the sixth aspect, in an eighth possible implementation, the first base station sends a clock peer state of the first base station by means of air interface signaling, including: The base station carries its own clock peer state in a preset bit in the physical broadcast channel PBCH.

The first base station sends the physical broadcast channel PBCH to the second base station, so that the second base station determines the first base station according to preset bits in the physical broadcast channel PBCH and a fourth preset rule. Clock peer status.

According to the first possible implementation manner of the sixth aspect, in a ninth possible implementation manner, the first base station sends a clock peer state of the first base station by means of air interface signaling, including: Determining, by the first base station, a peer level of the first base station according to its own clock peer state and a fifth preset rule;

Transmitting, by the first base station, a peer level of the first base station to the second base station on a physical layer channel, so that the second base station determines, according to the peer level and the fifth preset rule, The clock of the first base station is in the same state. According to the first possible implementation manner of the sixth aspect, in a tenth possible implementation manner, the first base station sends a clock peer state of the first base station by means of air interface signaling, including: The first base station sends the clock peer state of the first base station to the UE through the physical layer channel, so that the UE sends the clock peer state of the first base station to the second base station by using the uplink transport channel.

According to the ninth or the tenth possible implementation manner of the sixth aspect, in the eleventh possible implementation manner, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a bearer system The channel of the information block SIB, the paging channel, the physical downlink control channel PDCCH, the enhanced physical downlink control channel EPDCCH, and the physical downlink shared channel PDSCH.

The clock synchronization method and device provided by the embodiment of the present invention, after the first base station determines its own clock peer state, sends the clock peer state to the second base station, and the second base station according to the clock of the first base station The state is determined to be the same as the source base station, and then based on the same source base station, that is, the second base station can confirm the clock peer state of the first base station before performing the peer, only when determining the clock of the first base station. The first base station is determined to be the same source base station after being reliable and/or the clock peer type of the first base station has a high priority, so that the second base station can be avoided due to the inaccuracy of the clock information of the first base station. Inaccurate problems ensure that the second base station performs the same according to the correct clock information, which can improve the accuracy of the clock synchronization of the entire system. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

Figure 1 is a schematic structural view of a multi-hop homonym system;

2 is a schematic structural view of Embodiment 1 of a clock homophone device according to the present invention;

3 is a schematic structural diagram of Embodiment 2 of a clock homophone device according to the present invention;

4 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention;

5 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention;

6 is an interaction flowchart of Embodiment 1 of a clock synchronization method according to the present invention; Figure 7 is a schematic diagram showing the time-frequency distribution of PSS and SSS in an FDD system. detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In this paper, unless otherwise specified, the smaller the peer level, the higher the accuracy of the peer, or the smaller the number of peer hops experienced between the base station and the external source. The base station according to the embodiment of the present invention includes a macro base station and a micro base station. In the following embodiments, the first base station indicates that the base station provides the peer information, and the second base station indicates that the base station needs to be the same (requires updating the peer information). Base station. The second base station performs the same source resource base station search process, which may be performed when the second base station is just turned on, or may be executed when the second base station runs after searching for a period of time and then searches for the same source again.

2 is a schematic structural diagram of Embodiment 1 of a clock peer device according to the present invention. The device in this embodiment may be configured on a base station, and the base station may serve as a second base station, that is, a base station that needs to update peer information. As shown in FIG. 2, the apparatus 200 of this embodiment may include: a receiving module 11, a determining module 12, and a peer module 13, wherein

The receiving module 11 may be configured to receive a clock peer state of the at least one first base station; the determining module 12 may be configured to determine the same source base station according to the clock peer state of the first base station;

The peer module 13 may be configured to perform the same according to the clock information of the same source base station, where the clock peer state includes whether the clock peer is reliable and/or the clock peer type, and the first base station The clock synchronization type includes at least one of a clock peer source of the first base station, an operator of the first base station, a base station type of the first base station, and an identity of the first base station.

The clock peers included in the clock peer state may be, for example: a clock peer from a Global Navigation Satellite System (GNSS), such as a GPS, a Beidou satellite navigation system, or a wired network (such as the IEEE1588 clock)歩 protocol, Ethernet clock peer protocol), or the clock provided by the macro base station with the overlapping area of the micro base station 歩, or the same clock provided by the micro base station.

The base station type of the first base station may be: a macro base station, a micro base station, and a micro base station, which is characterized by low transmission power and small coverage, and the micro base station may specifically include a metro cell, a micro cell, and a pico cell. (Pico cell), Femto cell.

The identity of the first base station may be: a base station (for example, a header) that directly implements a clock with the same source through the external source, and a base station (for example, a non-header) that does not directly communicate with the same source through the external source, and the external source may be : The clock provided by the GNSS is the same; the clock provided by the wired network is the same; the clock provided by the macro base station is the same; the base station that does not directly communicate with the same source through the external source can be: The base station that obtains the same clock by the header.

It should be noted that the identity of the base station is generally for a cluster of base stations, and the cluster of base stations may be multiple base stations densely deployed in a certain geographical area. The clustering may be defined by a carrier, a cluster. The header in the base station may be a base station in the cluster base station that acquires the same clock with the external source through the out-of-cluster clock, and the non-header is the base station in the cluster base station that acquires the same clock through the header.

The definition of whether the clock peer is reliable or not can be: The base station that can obtain the clock information directly through the external source or indirectly through the external source is considered to be a reliable base station, and the clock is directly obtained through the external source. Information means that the base station can obtain clock information directly from GNSS, such as GPS, Beidou satellite navigation system, or wired network (such as IEEE1588 clock peer protocol, Ethernet clock peer protocol); indirectly obtain the clock through the external source The information indicates that the base station obtains the clock information of the external source through other base stations. For example, the base station A directly acquires the clock peer through the external source, and the base station B acquires the clock peer through the base station A, then the clock peer of the base station B belongs to Indirect access to peer information through the outside world, SP, can also be considered reliable.

Whether the clock peer is reliable or not can also be defined as: The clock of the base station considering the relative clock relationship with other base stations is considered to be reliable, and the clock of the base station that does not consider the relative clock relationship with other base stations will be considered. Peer is considered unreliable.

The definition of whether the clock peer is reliable or not can also be: The clock of the same base station is considered to be reliable, and the clock of the base station that is not the same (or failed) is considered to be unreliable.

The definition of whether the clock peer is reliable or not can also be: The clock of the base station directly or indirectly passed through the GNSS or the wired network is considered to be reliable, and the clock of the base station that does not directly or indirectly pass the GNSS or the wired network is considered as not Reliable, such as any of the isolated base stations or a cluster of base stations deployed in isolation. The definition of whether the clock peer is reliable or not can also be: The clock source of the GNSS, the wired network, and the base station of at least one of the peer base stations is considered to be reliable; otherwise, it is considered unreliable, such as an isolated base station or Any one of a cluster of base stations deployed in isolation.

Whether the clock peer is reliable or not can be defined according to other rules. For example, it can also be defined as: As long as any of the above-mentioned "clock peers are not reliable" definition base stations are considered to be unreliable; or as long as the above is satisfied Any base station whose definition of "clock is reliable" is considered to be reliable. This embodiment of the present invention does not limit this.

It should be noted that whether the clock peer is reliable or not can be defined by a standard protocol specification, or can be implemented by a network side configuration, for example, by an OAM configuration, a macro base station configuration, or a behavior implemented by a base station side. The first base station and/or the second base station are made known to each other.

The first base station may comprise a macro base station and a pico base station, and the second base station is preferably a micro base station, but may also comprise a macro base station. The first base station and the second base station may belong to the same operator or may belong to different operators.

Optionally, in a manner, the receiving module 11 is specifically configured to:

Receiving a clock peer state of the first base station by means of air interface signaling.

Optionally, in another manner, the receiving module 11 is specifically configured to:

Receiving a clock peer state of the first base station by means of a backhaul link backhaul; or receiving a clock peer state of the first base station by using a centralized controller, where a clock peer state of the first base station is The first base station reports to the centralized controller; or

The backhaul backhaul can be an S1/X2 interface.

Specifically, when the clock peer state of the first base station indicates that the clock of the first base station is reliable, and/or indicates that the clock peer type of the first base station has a high priority, the clock of this embodiment is the same. The device may use the first base station as a candidate peer base station or directly determine the first base station as a peer source base station.

Since the receiving module 11 may receive the clock peer state of the plurality of first base stations, and there may be multiple first base stations having the same clock state, for example, there are multiple first clocks with reliable clocks, these clocks are reliable. The first base station can be used as a candidate peer base station, and the determining module 12 can select a first base station as the same source base station according to a preset rule, for example, according to the peer class. Selecting, selecting the first base station with the lowest peer level as the same source base station; or, selecting according to the priority of the clock peer type, providing high homology precision, small homology error, and facilitating different operators The clock peer type of the first base station has a high priority, and the priority of the clock peer type can be expressed as follows: The clock source is GNSS priority is greater than the clock source is the priority of the wired network or wireless peer, the clock The first base station whose source is the GNSS or the wired network has a higher priority than the first base station whose clock source is the wireless peer, and the first base station whose clock source is the wireless peer, refers to the first base station receiving the same signal transmitted by other base stations. Realizing the same; the priority of the macro base station is greater than the priority of the micro base station, the priority of the first base station belonging to the same operator as the second base station is greater than the first base station not belonging to the same carrier by the second base station (in some scenarios) The first base station that belongs to the same carrier as the second base station may have a lower priority than the first base station that does not belong to the same carrier as the second base station. If it is determined that the first base station is the same source base station and has the least impact on other already connected base stations, then such first base station can be considered to have a high priority clock peer type, and the first base station can be used as the first base station The same as the source base station, the impact is the smallest, which may mean that the number of base stations that need to re-adjust the clock peer is the least for the base stations that have already been the same; or the priority of the clock peer type of the first base station as the header is greater than The clock of the first base station of the non-header is of the same type as the priority of the first base station, and the first base station of the non-header can be marked with the clock of the first base station, or the first base station is a header or a non-header. To mark.

For the case of multiple candidate peer base stations, the second base station may also be selected according to other rules, which is not limited in this embodiment of the present invention.

It should be noted that the priority corresponding to different types of clocks can be defined by standard protocol specifications or by network side configuration, for example, by OAM configuration, by macro base station configuration, or by base station side. The behavior is not limited herein, so that the first base station and/or the second base station can be known.

In the clock peer device of the embodiment, after the receiving module receives the clock peer state of the first base station, the determining module determines the same source base station according to the clock peer state of the first base station, and then the peer module is based on the same The source base station performs the same, that is, it can confirm the clock peer state of the first base station before performing the peer, and only has the high priority in determining whether the clock of the first base station is reliable and/or the clock type of the first base station is high. After the level is determined, the first base station is determined to be the same as the source base station, so that the problem that the second base station is inaccurate due to the inaccuracy of the clock information of the first base station is avoided, and the second base station is ensured according to the correct clock information. Peer, can improve the clock peer of the entire system Precision.

Further, the receiving module 11 can be configured in the following six manners.

In the first alternative implementation, the cell identity (cell identity) is used to indicate the clock peer state.

Therefore, the receiving module 11 can be specifically used to:

Receiving a cell identifier of at least one first base station;

In a second optional implementation, the clock peer state of the first base station may be indicated by a primary peer sequence PSS and/or a secondary sequence SSS.

The receiving module 11 can be specifically configured to:

It should be noted that the second optional implementation may include two situations:

In one case, both the PSS and the SSS are used to indicate the clock peer state of the first base station, which may correspond to the scheme for determining the clock peer state according to the cell identity in the first alternative implementation manner, that is, After receiving the PSS and the SSS of the first base station, the receiving module 11 may determine the cell identifier of the first base station according to the PSS and/or the SSS, and then determine the clock of the first base station according to the first preset rule.歩 state; of course, the clock peer state can be directly indicated by the PSS and the SSS, that is, after receiving the PSS and the SSS of the first base station, the receiving module 11 directly determines the clock peer state of the first base station according to the sixth preset rule. .

In another case, only one of the PSS and the SSS is used to indicate the clock peer state of the first base station, that is, the receiving module 11 receives the PSS and the SSS of the first base station, but determines the first base station only according to the PSS or the SSS. The clock is in the same state.

In a third optional implementation, one or more sequences may be introduced to indicate a clock peer state of the first base station. The sequence can be sent by means of air interface signaling.

Therefore, the receiving module 11 can be specifically used to:

Receiving a sequence sent by the first base station, and determining a clock peer state of the first base station according to the sequence and the second preset rule. Wherein the transmission time position of the sequence has a preset time interval between the PSS or the SSS transmission time position, and/or the transmission frequency position of the sequence and the PSS or the SSS transmission frequency position There is a preset frequency interval between each other. Therefore, the receiving module 11 can receive the primary synchronizing sequence PSS and/or the auxiliary synchronizing sequence SSS sent by the first base station, and at least one sequence.

In the foregoing third optional implementation manner, the second base station may detect at a preset sending position and/or a preset frequency position, determine whether the sequence exists, or determine a sequence of the received sequence to determine the sequence. The clock state of a base station.

Optionally, in addition to indicating the clock peer state of the first base station by using the introduced sequence, the sequence of the sequence may be used to indicate the clock peer state of the first base station. For example, introducing a first sequence having multiple formats, when the first sequence is transmitted at the first frequency position, indicating that the clock of the first base station is reliable, and when the first sequence is sent at the second frequency position, indicating The clock of a base station is unreliable; or, for example, when the first sequence is transmitted at different time positions or frequency positions, indicating different clock synchronizing types of the first base station. In a specific implementation, the first sequence may be an NLRS sequence.

Therefore, the receiving module 11 is specifically configured to:

In a fourth optional implementation manner, the clock peer state may be indicated by a preset bit of the PBCH, for example, the clock peer may be reliable or unreliable by using 1-bit information, or may be bitmapped by X-bit information (bitmap) The form of the clock indicates the type of the clock peer, or the type of the clock is indicated in binary form by the y-bit information, where X, y are integers.

Therefore, the receiving module 11 can be specifically used to:

In a fifth alternative implementation, the clock peer state can be indicated by a predefined peer level. For example, the maximum peer level or reserved peer level that can be supported in the system can be used to indicate whether the clock peer is reliable or the different peer classes that can be supported in the system can be different. . Further, the peer level can be identified by different cells, Different sequence formats, preset bits in the PBCH are represented.

Therefore, the receiving module 1 1 can be specifically used to:

Determining a clock peer state of the first base station according to the peer level and a fifth preset rule. In a sixth optional implementation manner, the clock state information of the first base station can be obtained by means of UE assistance.

Therefore, the receiving module 1 1 can be specifically used to:

The clock peer state of the first base station sent by the UE is received by the uplink transmission channel, and the clock peer state of the first base station is sent by the first base station to the UE by using a physical layer channel.

In a specific implementation, a signal that can receive the first base station and the second base station at the same time may be selected.

The UE serves as the secondary UE, and the first base station may notify the secondary UE of the clock state information of the first base station by using the physical layer channel, and the secondary UE may notify the second base station of the clock state information of the first base station by using the uplink transmission channel, where The time resource, the frequency resource, and the sequence resource occupied by the clock state information of the first base station in the uplink transport channel may be defined in advance. Therefore, the receiving module 1 1 can detect whether the energy exceeds the set threshold on the fixed time resource and the frequency resource to determine the clock peer state of the first base station, for example, whether the clock peer is reliable, or can be used at a fixed time resource and Different sequences are detected on the frequency resources to distinguish the clock peer state of the first base station. The specific format of the physical layer channel occupied by the first base station to notify the secondary UE of the clock state information may also be defined in advance or obtained by UE blind detection.

In the fifth and sixth implementation manners, the physical layer channel may include at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a channel carrying a system information block SIB, a paging channel, and a physical downlink control channel. PDCCH, enhanced physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.

FIG. 3 is a schematic structural diagram of Embodiment 2 of a clock peer device according to the present invention. The device in this embodiment may be configured on a base station, and the base station may serve as a first base station, that is, a base station that needs to update peer information. As shown in FIG. 3, the apparatus 300 of this embodiment may include: a determining module 21 and a sending module 22, where

a determining module 21, configured to determine a clock peer state of the first base station, where a clock peer state of the first base station includes whether a clock peer of the first base station is reliable and/or a clock peer type, the first base The clock peer type of the station includes at least one of a clock peer source of the first base station, an operator of the first base station, a base station type of the first base station, and an identity of the first base station;

The sending module 22 is configured to send a clock peer state of the first base station to the second base station, so that the second base station determines the same source base station according to the clock peer state of the first base station, and according to the first The clock information of the base station is the same.

The clock peers include the same clock source as: Clock peers from Global Navigation Satellite System (GNSS), such as GPS, Beidou satellite navigation system, or wired network (such as IEEE1588 clock) The peer protocol, the Ethernet clock peer protocol, or the clock provided by the macro base station having the overlapping area of the micro base station, or the clock provided by the micro base station.

It should be noted that the identity of the base station is generally for a cluster of base stations, and the cluster of base stations may be multiple base stations densely deployed in a certain geographical area. The clustering may be defined by the operator when deployed. The header in the cluster base station may be a base station in the cluster base station that acquires the same clock with the external source through the out-of-cluster clock, and the non-header is the base station in the cluster base station that acquires the same clock through the header.

The definition of whether the clock peer is reliable or not can be: The base station that can obtain the clock information directly through the external source or indirectly through the external source is considered to be a reliable base station, and the clock is directly obtained through the external source. Information means that the base station can obtain clock information directly from GNSS, such as GPS, Beidou satellite navigation system, or wired network (such as IEEE1588 clock peer protocol, Ethernet clock peer protocol); indirectly obtain the clock through the external source The information indicates that the base station obtains the clock information of the external source through other base stations. For example, the base station A directly acquires the clock peer through the external source, and the base station B acquires the clock peer through the base station A, then the clock peer of the base station B belongs to Indirect access to peer information through the outside world, SP, can also be considered reliable. Whether the clock peer is reliable or not can also be defined as: The clock of the base station considering the relative clock relationship with other base stations is considered to be reliable, and the clock of the base station that does not consider the relative clock relationship with other base stations will be considered. Peer is considered unreliable.

The definition of whether the clock peer is reliable or not can also be: The clock of the base station directly or indirectly passed through the GNSS or the wired network is considered to be reliable, and the clock of the base station that does not directly or indirectly pass the GNSS or the wired network is considered as not Reliable, such as isolated base stations.

Optionally, in a manner, the sending module 22 may be specifically configured to:

Transmitting the clock peer state of the first base station by means of air interface signaling.

Optionally, in another manner, the sending module 22 is specifically configured to:

Transmitting the clock peer state of the first base station by means of a backhaul link backhaul; or reporting the clock peer state of the first base station to the centralized controller, so that the centralized controller will perform the first Sending a clock peer state of the base station to the second base station; or

The backhaul backhaul can be an S1/X2 interface.

When the sending module 22 sends the clock peer state of the first base station indicating that the clock of the first base station is reliable and/or the clock peer type of the first base station has a high priority, the second base station may A base station acts as a candidate peer base station or directly determines the first base station as a peer source base station.

The clock peer device of the embodiment determines the clock state of the clock by the determining module, and sends the clock peer state of the first base station to the second base station by using the sending module, so that the second base station to be peered can Confirming the clock peer state of the first base station before performing the peer, and determining the first base station only after determining that the clock of the first base station is reliable and/or the clock peer type of the first base station has a high priority. The same as the source base station, thereby avoiding the problem that the second base station is inaccurate due to the inaccuracy of the clock information of the first base station, and ensuring that the second base station performs the same according to the correct clock information, thereby improving the clock of the entire system. The accuracy of 歩. Further, the transmitting module 22 in the above embodiment may be configured in the following six manners.

In the first optional implementation, the clock peer status is indicated by the cell identifier cell ID. Therefore, the sending module 22 can be specifically used to:

Therefore, the sending module 22 can be specifically used to:

Determine the main homologous sequence according to its own clock peer state and the sixth preset rule? 88 and / or auxiliary 歩 sequence SSS;

Transmitting, to the second base station, the primary synchronic sequence PSS and/or the secondary synchronizing sequence SSS, so that the second base station determines, according to the primary synchronic sequence PSS and/or the auxiliary synchronizing sequence SSS The clock peer state of the first base station.

Therefore, the sending module 22 can be specifically used to:

Wherein the transmission time position of the sequence has a preset time interval between the PSS or the SSS transmission time position, and/or the transmission frequency position of the sequence and the PSS or the SSS transmission frequency position The transmission module 22 is specifically configured to: send the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS to the second base station, and At least one of said sequences.

Optionally, in addition to indicating the clock peer state of the first base station by using the introduced sequence, The pattern of the sequence indicates the clock peer state of the first base station. For example, introducing a first sequence having multiple formats, when the first sequence is transmitted at the first frequency position, indicating that the clock of the first base station is reliable, and when the first sequence is sent at the second frequency position, indicating The clock of a base station is unreliable; or, for example, when the first sequence is transmitted at different time positions or frequency positions, indicating different clock synchronizing types of the first base station. In a specific implementation, the first sequence may be an NLRS sequence.

Therefore, the sending module 22 can be specifically used to:

In the fourth optional implementation manner, the clock peer state may be indicated by a preset bit of the PBCH, for example, the 1-bit information may indicate that the clock peer is reliable or unreliable, and the bit map is used for the X-bit information. The form indicates the clock peer type, or the clock peer type is indicated in binary form by the y-bit information, where X, y are integers.

Therefore, the sending module 22 can be specifically used to:

Carrying its own clock peer state in a preset bit in the physical broadcast channel PBCH; transmitting the physical broadcast channel PBCH to the second base station, so that the second base station is pre-prescribed according to the physical broadcast channel PBCH And setting a bit and a fourth preset rule to determine a clock peer state of the first base station.

In a fifth alternative implementation, the clock peer status can be indicated by a predefined peer level. For example, the maximum peer level or reserved peer level that can be supported in the system can be used to indicate whether the clock peer is reliable or the different peer classes that can be supported in the system can be different. . Further, the peer level can be represented by different cell identifiers, different sequence formats, and preset bits in the PBCH.

Therefore, the sending module 22 can be specifically used to:

And transmitting, by the physical layer channel, the peer level of the first base station to the second base station, so that the second base station determines the clock of the first base station according to the peer level and the fifth preset rule. Peer status. In a sixth optional implementation manner, the clock state information of the first base station may be obtained by using a UE-assisted manner.

Therefore, the sending module 22 can be specifically used to:

In a specific implementation, a UE that can receive the signals of the first base station and the second base station can be selected as the secondary UE, and the first base station can notify the secondary UE of the clock state information of the first base station by using a physical layer channel, where the secondary UE can The clock state information of the first base station is used to notify the second base station by using the uplink transmission channel. The time resource, the frequency resource, and the sequence resource occupied by the clock state information of the first base station in the uplink transmission channel may be defined in advance. Therefore, the receiving module 11 can detect whether the energy exceeds the set threshold on the fixed time resource and the frequency resource to determine the clock peer state of the first base station, for example, whether the clock peer is reliable, or can pass the fixed time resource and frequency. Different sequences are detected on the resource to distinguish the clock peer state of the first base station. The specific format of the physical layer channel occupied by the first base station to notify the secondary UE of the clock state information may also be defined in advance or obtained by UE blind detection.

In the fifth and sixth implementation manners, the physical layer channel includes at least one of the following: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a channel carrying a system information block SIB, a paging channel, and a physical downlink control channel PDCCH. The enhanced physical downlink control channel EPDCCH and the physical downlink shared channel PDSCH.

Certainly, each of the base stations can serve as the second base station to be the same as the first base station to provide the peer information to the other base stations. Therefore, the clock for updating the peer information in each of the foregoing device embodiments. The peer device and the clock peer device for providing the peer information can be simultaneously set on one base station.

4 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention. The base station in this embodiment can be used as a second base station, that is, a base station that needs to update peer information. As shown in FIG. 4, the base station 400 of this embodiment may include: a receiver 401 and a transmitter 402, and further shows a processor 403, a memory 404, and a bus 405, the receiver 401, the transmitter 402, and the processor. 403. The memory 404 is connected through the bus 405 and completes communication with each other.

The bus 405 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an extended industrial standard. Extended Industry Standard Architecture (ESA) bus, etc. The bus

The 405 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 4, but it does not mean that there is only one bus or one type of bus.

Memory 404 is for storing executable program code, the program code including computer operating instructions. Memory 404 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory.

The processor 403 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

The receiver 401 is configured to receive a clock peer state of the at least one first base station, where the processor 403 is configured to determine, according to the clock peer state of the first base station, the same source base station; And performing the same according to the clock information of the same source base station; wherein, the clock peer state includes whether the clock peer is reliable and/or the clock peer type, and the clock peer type of the first base station includes the first At least one of a clock source of the base station, an operator of the first base station, a base station type of the first base station, and an identity of the first base station.

The clock peers included in the clock peer state may be, for example, a clock peer from a Global Navigation Satellite System (GNSS), such as a GPS, a Beidou satellite navigation system, or a wired network (such as the IEEE1588 clock).歩 protocol, Ethernet clock peer protocol), or the clock provided by the macro base station with the overlapping area of the micro base station, or the clock provided by the micro base station.

It should be noted that the identity of the base station is generally for a cluster of base stations, and a cluster of base stations may be multiple base stations densely deployed within a certain geographical area, and the clusters may be divided by the operator department. As defined by the department, a header in a cluster of base stations may be a base station in the cluster base station that acquires a clock with the same source through the out-of-cluster clock, and the non-header is a base station in the cluster base station that acquires the same clock through the header.

Optionally, in a manner, the receiver 401 is specifically configured to:

Optionally, in another manner, the receiver 401 is specifically configured to:

The backhaul backhaul can be an S1/X2 interface.

Specifically, when the clock peer state of the first base station indicates that the clock of the first base station is the same as the clock and the clock peer type has a high priority, the clock peer device of the embodiment may use the first The base station acts as a candidate peer base station or directly determines the first base station as the same source base station. Since the receiver 401 may receive the clock peer state of the plurality of first base stations, and there may be multiple first base stations with the same clock, the first base station with the same clock can be used as the candidate peer base station, and the processing is performed. The 403 may select a first base station as the same source base station according to a preset rule.

Since the receiver 401 may receive the clock peer state of the plurality of first base stations, and there may be multiple first base stations having the same clock state, for example, there are multiple first clocks with reliable clocks, these clocks are reliable. The first base station can be used as a candidate peer base station. The processor 403 can select a first base station as the same source base station according to a preset rule. For example, the first base station can be selected according to the peer level, and the first peer with the lowest rank is selected. The base station serves as the same source base station; or, according to the priority of the clock peer type, it can provide high homology precision, small homology error, and facilitate the same clock of the first base station between different operators. The type has a high priority, and the priority of the clock peer type can be expressed as follows: The clock source is GNSS with a priority greater than the clock source being the priority of the wired network or the wireless peer, and the clock source is the GNSS or the first base station of the wired network. The first base station whose priority is greater than the wireless source with the clock source is the same as the first base station of the wireless peer, and the first base station is the first base station. Receiving a peer signal transmitted by another base station to achieve the same; the priority of the macro base station is greater than the priority of the micro base station, and the priority of the first base station belonging to the same carrier as the second base station is greater than that of the second base station not belonging to the same operator. The first base station (in some scenarios, the first base station that belongs to the same carrier as the second base station may have a lower priority than the first base station that does not belong to the same carrier as the second base station); or, if the first base station is determined After the same as the other base station, the first base station can be regarded as a high-priority clock peer type, and the first base station can be regarded as the same source base station. The minimum impact may be that the number of base stations that need to re-adjust the clock peer is the smallest for the base stations that have already been the same; or the clock peer type of the first base station as the header has a higher priority than the first base station that is the non-header. The clock peer type priority, the first base station as the header and / or as a non-header can use the clock of the first base station Source to indicate, or directly with the first base station is a header or non-header.

It should be noted that the priority corresponding to different types of clocks can be defined by standard protocol specifications or by network side configuration, for example, by OAM configuration, by macro base station configuration, or by base station side. The behavior of the first base station is not limited here. And / or the second base station can know each other.

After receiving the clock peer state of the first base station by the receiver, the processor determines, according to the clock peer state of the first base station, the same source base station, and then performs the same based on the same source base station, that is, It is possible to confirm the clock peer state of the first base station before performing the peer, and determine the first base station only after determining that the clock of the first base station is reliable and/or the type of the clock peer has a high priority. The same as the source base station, thereby avoiding the problem that the second base station is inaccurate due to the inaccuracy of the clock information of the first base station, and ensuring that the second base station performs the same according to the correct clock information, thereby improving the clock of the entire system. The accuracy of 歩.

Further, the receiver 401 can be configured in the following six manners.

In the first optional implementation, the clock peer status is indicated by the cell identifier cell ID. Therefore, the receiver 401 can be specifically configured to:

Receiving a cell identifier of at least one first base station;

In the second alternative implementation, the primary synchronic sequence PSS and/or the auxiliary synchronizing sequence may be used.

The SSS indicates the clock peer state of the first base station.

Therefore, the receiver 401 can be specifically configured to:

According to the main colleague sequence? The 88 and/or the secondary sequence SSS determines the cell identity of the first base station.

Therefore, the receiver 401 can be specifically configured to:

In a specific implementation, the receiver 401 may be specifically configured to:

The second base station receives the primary synchronization sequence sent by the first base station? 88 and / or a secondary sequence SSS, and at least one sequence, the transmission time position of the sequence having a preset time interval between the PSS or the SSS transmission time position, and / or the transmission of the sequence There is a preset frequency interval between the frequency location and the PSS or the SSS transmission frequency location. Optionally, in addition to indicating the clock peer state of the first base station by using the introduced sequence, the sequence of the sequence may be used to indicate the clock peer state of the first base station.

Therefore, the receiver 401 can be specifically configured to:

In the fourth optional implementation manner, the clock peer state may be indicated by the preset bit of the PBCH. For example, the lbit information may indicate that the clock peer is reliable or unreliable, or may use a bit map of the X bit information. The form indicates the clock peer type, or the clock peer type is indicated in binary form by the y bit information, where X, y are integers.

Therefore, the receiver 401 can be specifically configured to:

Determining a clock peer state of the first base station according to the peer level and a fifth preset rule. In a sixth optional implementation manner, the clock state of the first base station can be learned by means of UE assistance.

Therefore, the receiver 401 can be specifically configured to:

In a specific implementation, a UE that can receive the signals of the first base station and the second base station can be selected as the secondary UE, and the first base station can notify the secondary UE of the clock state information of the first base station by using a physical layer channel, where the secondary UE can Using the uplink transport channel, the clock state of the first base station The information is notified to the second base station, wherein the time resource, the frequency resource, and the sequence resource occupied by the clock state information of the first base station in the uplink transmission channel may be defined in advance. Therefore, the receiver 401 can detect whether the energy of the first base station is in the same state, such as whether the clock peer is reliable, or the fixed time resource and frequency, on the fixed time resource and the frequency resource. Different sequences are detected on the resource to distinguish the clock peer state of the first base station. The specific format of the physical layer channel occupied by the first base station to notify the secondary UE of the clock state information may also be defined in advance or obtained by blind detection by the UE.

In the fifth and sixth implementation manners, the physical layer channel may include at least one of the following: a physical broadcast channel PBCH, a channel carrying a system information block SIB, a paging channel, a physical downlink control channel PDCCH, and an enhanced physics. Downlink control channel EPDCCH, physical downlink shared channel PDSCH.

FIG. 5 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention. The base station in this embodiment may serve as a first base station, that is, a base station that provides peer information. As shown in FIG. 5, the base station 500 of this embodiment may include: a receiver 501 and a transmitter 502, and further shows a processor 503, a memory 504, and a bus 505, the receiver 501, the transmitter 502, and the processor. 503. The memory 504 is connected through the bus 505 and completes communication with each other.

The bus 505 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (ESA) bus. The bus 505 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 5, but it does not mean that there is only one bus or one type of bus.

Memory 504 is for storing executable program code, the program code including computer operating instructions. Memory 504 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory.

The processor 503 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

The processor 503 may be configured to determine a clock peer state of the first base station, where the clock peer state of the first base station includes whether the clock of the first base station is reliable and/or a clock peer type. The clock peer type of a base station includes the clock peer source of the first base station, and the first base station slave At least one of the carrier, the base station type of the first base station, and the identity of the first base station; the transmitter 502, configured to send the clock peer state of the first base station to the second base station, so that the second base station Determining the same source base station according to the clock peer state of the first base station, and performing the same according to the clock information of the first base station.

The definition of whether the clock peer is reliable or not can be: The base station that can obtain the clock information directly through the external source or indirectly through the external source is considered to be a reliable base station, and the clock is directly obtained through the external source. Information means that the base station can obtain clock information directly from GNSS, such as GPS, Beidou satellite navigation system, or wired network (such as IEEE1588 clock peer protocol, Ethernet clock peer protocol); indirectly obtains clock information through external sources It means that the base station obtains the clock information of the external source through other base stations. For example, the base station A directly acquires the clock peer through the external source, and the base station B acquires the clock peer through the base station A, then the clock of the base station B belongs to the indirect. By obtaining the same information from the outside world, the SP can also be considered reliable.

The definition of whether the clock peer is reliable or not can also be: It will take into account the relative clocks of other base stations. The clock of the base station of the 歩 relationship is considered to be reliable, and the clock of the base station that does not consider the relative clock relationship with other base stations is considered to be unreliable.

Optionally, in one manner, the transmitter 502 is specifically configured to:

The first base station sends a clock peer state of the first base station by means of air interface signaling. Optionally, in another manner, the transmitter 502 is specifically configured to:

The backhaul backhaul can be an S1/X2 interface.

Specifically, when the clock peer state of the first base station indicates that the clock of the first base station is the same as the clock and the clock peer type has a high priority, the base station in this embodiment may use the first base station as a candidate. The same source base station or directly determines the first base station as the same source base station.

The base station in this embodiment sends its own clock peer state to the second base station after determining its own clock peer state, so that the second base station can determine the same source base station according to the clock peer state of the first base station. And the peer base station performs the same, that is, enables the second base station to confirm the clock peer state of the first base station before performing the peer, thereby avoiding the second clock due to the inaccuracy of the clock information of the first base station. The problem of inaccurate peers of the base station ensures that the second base station performs the same according to the correct clock information, which can improve the accuracy of the clock synchronization of the entire system.

Further, the transmitter 502 can be configured in the following six manners.

In the first optional implementation, the clock peer status is indicated by the cell identifier cell ID. Therefore, the transmitter 502 can be specifically configured to:

Therefore, the transmitter 502 can be specifically configured to:

In a specific implementation, the transmission time position of the sequence may be set to have a preset time interval between the PSS or the SSS transmission time position, and/or the sequence transmission frequency position is related to the PSS or the There is a preset frequency interval between SSS transmission frequency positions;

The transmitter 502 can be specifically configured to:

Optionally, in addition to indicating the clock peer state of the first base station by using the introduced sequence, the sequence of the sequence may be used to indicate the clock peer state of the first base station.

Therefore, the transmitter 502 can be specifically configured to:

In the fourth optional implementation manner, the clock peer state may be indicated by a preset bit of the PBCH. For example, the 1-bit information may indicate that the clock peer is reliable or unreliable, and the X-bit information indicates the clock in the form of a bitmap.歩 type, or when the y-bit information is indicated in binary form The type of the same type, x and y are integers.

Therefore, the transmitter 502 can be specifically configured to:

In a sixth optional implementation manner, the clock state of the first base station can be learned by means of UE assistance.

Therefore, the transmitter 502 can be specifically configured to:

In a specific implementation, a UE that can receive the signals of the first base station and the second base station can be selected as the secondary UE, and the first base station can notify the secondary UE of the clock state information of the first base station by using a physical layer channel, where the secondary UE can The clock state information of the first base station is used to notify the second base station by using the uplink transmission channel. The time resource, the frequency resource, and the sequence resource occupied by the clock state information of the first base station in the uplink transmission channel may be defined in advance. Therefore, the second base station can detect whether the energy of the first base station is reliable by detecting whether the energy exceeds the set threshold on the fixed time resource and the frequency resource, and can also detect different sequences on the fixed time resource and the frequency resource. , to distinguish the clock peer state of the first base station. The first base station notifies the secondary UE clock The specific format of the physical layer channel occupied by the status information may also be defined in advance or passed.

UE blind detection is obtained.

In the fifth and sixth implementation manners, the physical layer channel may include at least one of the following: a physical broadcast channel PBCH, a channel carrying a system information block SIB, a paging channel, a physical downlink control channel PDCCH, and an enhanced type. Physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.

FIG. 6 is an interaction flowchart of Embodiment 1 of the clock synchronization method of the present invention. In this embodiment, the first base station is a base station that provides clock peer information, and the second base station is a base station to be peered. As shown in FIG. 6, the clock synchronization method of this embodiment can be as follows.

Step 601: The first base station determines its own clock peer state.

The clock peer relationship includes whether the clock peer is reliable and/or the clock peer type. The clock peer type of the first base station may include a clock peer source of the first base station, and a carrier of the first base station slave. At least one of a base station type of the first base station and an identity of the first base station.

The clock peers include the same clock source as: Clock peers from GNSS, such as GPS, Beidou satellite navigation system, or wired network (eg IEEE1588 clock peer protocol, Ethernet clock peer protocol) ), or the clock provided by the macro base station having the overlapping area of the micro base station, or the clock provided by the micro base station is the same as the base station type of the first base station: macro base station, micro base station, and micro base station The radio base station may include a metro cell, a micro cell, a pico cell, and a femto cell.

Whether the clock peer is reliable or not can be: It will be able to connect directly to the source or the source through the outside world. The base station that obtains the clock information through the external source and the source is considered to be a reliable base station, and the clock information is directly obtained through the external source, which means that the base station can directly from the GNSS, such as GPS, Beidou satellite navigation system, or The wired network (for example, the IEEE1588 clock peer protocol and the Ethernet clock peer protocol) acquires clock information; the indirect acquisition of the clock information by the external source means that the base station obtains the clock information of the external source through other base stations, for example, the base station A. The clock peer is obtained directly from the external source, and the base station B obtains the clock peer through the base station A. Then, the clock of the base station B is indirectly obtained through the external source, and the SP can also be considered as reliable. .

Step 602: The first base station sends a clock peer state of the first base station to the second base station. Correspondingly, the second base station receives the clock peer state of the first base station.

In the step 602, the manner in which the second base station receives the clock peer state of the first base station may be a network listening mode of the second base station, or may be a backhaul manner, or It can be assisted by User Equipment (User Equipment, UE for short).

Optionally, in an implementation manner, the step 602 may be: the first base station sends a clock peer state of the first base station by using air interface signaling.

This method can be applied to scenarios in which the first base station and the second base station are subordinate to different operators, and also applicable to scenarios in which the first base station and the second base station are subordinate to the same carrier.

Optionally, in another implementation manner, the first base station sends a clock peer state of the first base station by using a backhaul link backhaul; or The first base station reports the clock state of the first base station to the centralized controller, so that the centralized controller sends the clock peer state of the first base station to the second base station; or The first base station reports the clock peer state of the first base station to the macro base station, so that the macro base station sends the clock peer state of the first base station to the second base station.

When the macro base station sends the clock peer status, there are two cases:

In the first case, the first base station and the second base station transmit through a macro base station. Specifically, the first base station reports the clock peer state of the first base station to a macro base station having a radio interface or a wired interface with the first base station, and may be, for example, a macro base station having a coverage overlap area with the first base station. So that the macro base station sends the clock peer state of the first base station to the second base station.

In the second case, the first base station and the second base station transmit through two macro base stations. Specifically, the first base station reports the clock peer state of the first base station to a first macro base station that has a radio interface or a wired interface with the first base station, and may be, for example, a coverage overlap area with the first base station. a macro base station, such that the first macro base station sends a clock peer state of the first base station to the second macro base station, so that the second macro base station compares the clock of the first base station The status is sent to the second base station. In this process, data transmission between the first macro base station and the second macro base station can also be forwarded by the centralized controller.

The sending a clock peer state of the first base station by using the backhaul link may be applicable to a scenario in which the first base station and the second base station are subordinate to the same carrier. The scenario in which the first base station and the second base station are subordinate to different operators.

The backhaul backhaul can be an S1/X2 interface.

Step 603: The second base station determines the same source base station according to the clock peer state of the first base station. Specifically, when the clock peer state of the first base station indicates that the clock of the first base station is reliable, and/or indicates that the clock peer type of the first base station has a high priority, the second base station may The first base station serves as a candidate peer base station or directly determines the first base station as a peer source base station.

Since the second base station may receive the clock peer state of the plurality of first base stations in step 602, and there may be multiple first base stations with the same clock, the first base station with the same clock can be used as a candidate. The second base station may select a first base station as the same source base station according to a preset rule, for example, may select according to the peer level, and select the first base station with the lowest peer level as the same source base station; or It can be selected according to the priority of the clock peer type, and can provide high homology precision, small homology error, and facilitate the first base station of the peer between different operators. The clock peer type has a high priority, and the clock peer type priority can be expressed as: The clock source is

The priority of the GNSS is greater than the priority of the wired network or the wireless peer, the clock source is GNSS or the first base station of the wired network has a higher priority than the first base station whose clock source is the wireless peer, and the clock source is the wireless peer. The first base station means that the first base station realizes the peer by receiving the homology signal sent by the other base station; the priority of the macro base station is greater than the priority of the micro base station, and the priority of the first base station belonging to the same carrier of the second base station a first base station that is not in the same carrier as the second base station. (In some scenarios, the first base station that belongs to the same carrier as the second base station may have a lower priority than the second base station does not belong to the same carrier. Or a base station); or, if it is determined that the first base station is the same source base station, and has the least impact on other already connected base stations, then the first base station can be used as the same source base station, the impact is minimal, and Refers to the base station that has already been peered, the number of base stations that need to re-adjust the clock peer is the least; or, the priority of the first base station as the header The priority of the first base station that is greater than the non-header, the first base station as the header and/or the non-header may be marked with the clock of the first base station, or directly indicated by the first base station as a header or a non-header. . The selection may be made according to other rules, which is not limited by the embodiment of the present invention.

It should be noted that the priority corresponding to the different types of clocks can be implemented by the network side, or can be implemented by the base station side, which is not limited, so that the first base station and/or the second base station can know each other. .

Step 604: The second base station performs the same according to the clock information of the same source base station.

In this embodiment, after the first base station determines its own clock peer state, it sends the clock peer state to the second base station, and the second base station determines the same source base station according to the clock peer state of the first base station, and then The peer base station is configured to perform the same, that is, the second base station can confirm the clock peer state of the first base station before performing the peer, and only determine that the clock of the first base station is reliable and/or the clock of the first base station. After the peer type has a high priority, the first base station is determined to be the same source base station, so that the problem that the second base station is inaccurate due to the inaccuracy of the clock information of the first base station can be avoided, and the second base station is guaranteed. By synchronizing with the correct clock information, the accuracy of the clock synchronization of the entire system can be improved.

Further, in the step 602 of the first embodiment, the first base station sends the clock peer state of the first base station to the second base station, and the following six implementation manners may be adopted.

In the first optional implementation, the cell identity (cell ID) is used. To indicate the clock peer status.

Specifically, the foregoing step 602 can include:

The first base station sends the cell identifier of the first base station to the second base station; the second base station determines the clock peer state of the first base station according to the cell identifier of the first base station and the first preset rule. . That is, the cell ID of the first base station carries information that the clock peer is reliable. The cell identifier cell ID may be represented by a physical cell identifier (PCI), or an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN Cell Global Identifier). It can also be expressed in other ways, as long as it can be ensured that the first base station can be uniquely determined in the same operator and/or different operator scenarios by the cell identity of the first base station. . For example, suppose that the set of all cell IDs is N, and the part cell ID is taken from the set N to form the set M. Obviously, M is the true subset of N. The cell ID included in the M is used to indicate that the clock of the first base station is unreliable, and the cell ID that does not belong to the set M is used to indicate that the clock of the first base station is equally reliable; or the cell ID included in the M is used to indicate the The clock of a base station is reliable, and the cell ID that does not belong to the set M is used to indicate that the clock of the first base station is unreliable.

The cell ID for indicating that the clock is reliable and/or unreliable can be known to the second base station in a predefined manner, or the first base station and the second base station can be known, for example, by factory setting; or by a centralized controller For example, the operation management and maintenance (OAM) configuration is implemented; or it can be configured by a centralized controller such as a Mobility Management Entity (MME); or it can be implemented by other centralized controllers. The configuration may be implemented by a coordinator or an E-coordinator (Enhanced Coordinator); or may be implemented by a macro base station having a wireless or wired interface with the first base station and the second base station, where the macro base stations may be the same or different. The "wireless interface" herein means that the macro base station can notify the second base station, or the first base station and the second base station, the "wired" by using the air interface signaling manner to indicate whether the clock is reliable or unreliable. The interface "can be an S1 interface or an X2 interface.

If the first base station and/or the second base station know the set of cell IDs for indicating the clock peer reliability by the above predefined manner, the cell ID ensemble that the system can support can be utilized (for example, for the LTE system, if the cell ID is PCI) Representing, then the cell ID corpus includes 504 different cPCIs, deriving a set of cell IDs indicating that the clock peers are unreliable; for the same reason, if the first base The station or the second base station learns the set of cell IDs for indicating that the clock peers are unreliable in the above predefined manner, and can utilize the cell ID ensemble that the system can support (for example, for the LTE system, if the cell ID is represented by PCI, then the cell The ID ensemble consists of 504 different PCIs, and the set of cell IDs used to indicate that the clocks are reliable at the same time is derived.

The method for determining the cell ID of the first base station may be as follows:

In a first possible manner, the first base station may determine the cell ID according to its own clock peer state and the learned cell ID set indicating that the clock is in a reliable and unreliable state;

In a second possible manner, the first base station can be configured and implemented according to the clock peer state of the first base station by using the centralized controller and the macro base station having the wireless or wired interface of the first base station, for the second possible manner. Optionally, the macro base station that needs the centralized controller and the first base station has a wireless or wired interface first knows the clock peer state of the first base station. For example, the first base station may report the clock state of the first base station to the centralized controller, and the macro base station having the wireless or wired interface of the first base station, so that the clock state of the first base station is known.

After receiving the cell ID of the first base station, the second base station may determine whether the cell ID of the first base station belongs to a cell ID indicating that the clock is reliable. If yes, the clock state of the first base station may be determined as Reliable; if not, it can be determined that the clock peer state of the first base station is unreliable.

It should be noted that, in this implementation manner, the second base station receives the cell identifier of the at least one first base station, and may be in the form of air interface signaling or a backhaul manner, which is not limited by the embodiment of the present invention.

Similarly, in the foregoing optional implementation manner, the clock identifier type may also be indicated by the cell identifier cell ID. The clock peer type may include at least one of a clock peer source, an operator of the first base station, a base station type of the first base station, and an identity of the first base station. Specifically, the cell ID may be specified to be the same as various clocks. Corresponding relationship between the source, or the correspondence between the cell lD and the subordinate operator of the base station, or the correspondence between the cell ID and the type of the base station, or the correspondence between the cell ID and whether the first base station is a header or a non-header relationship.

In a specific implementation, one method is: a part of the cell ID may be reserved to represent the clock source as the GNSS, a part of the cell ID represents the clock peer source as the wired network, and a part of the cell ID represents the clock peer source as the macro base station, such that The second base station may determine the source of the clock of the first base station according to the cell ID of the first base station, so as to determine whether the first base station can be used as the same source base station; one method is: assign different cell IDs to different operators. , for example, a base station belonging to the first carrier The cell ID in the first range is used, so that the second base station can determine, according to the cell ID of the first base station, the operator to which the first base station belongs, so as to determine whether the first base station can be used as the same source base station; The base station of the operator adopts the cell ID in the second range; the other method is to allocate different cell IDs by using different types of base stations, so that the second base station can determine the type of the first base station according to the cell ID of the first base station, thereby Determining whether the first base station can be used as the same source base station;

Another method is: assigning different cell IDs to the first base stations having different identities, for example, using a cell ID in the first range for a base station or a cluster of base stations in a cluster of base stations that directly implement the same clock source through the external source. For a non-header in a base station or a cluster of base stations that do not directly communicate with the same source through the external source, the cell ID in the second range is used, where a cluster of base stations can be densely deployed in a certain geographical area. The base station, the clustering may be defined by the operator when deployed, where the header may be a base station in the cluster of base stations that acquires the same clock with the source through the cluster clock, and the non-header is a cluster of base stations that acquires the clock through the header. Peer base station.

The cell identifier may be composed of a primary synchronization sequence (L1), and a secondary synchronization sequence (SSS). In the existing LTE specifications, there are 504 PCIs, wherein the PCI configuration may be expressed as a physical cell identifier = a PCI group X (the number IDs in each group). The S-504 physical cell identifiers may be divided into 168 physical cell identifier groups, and each physical cell identifier group includes three identification numbers. Therefore, the reservation of the cell ID (for example, PCI) can also be implemented by reserving the cell ID group (for example, a physical cell identity group) or by reserving the number IDs in each grou, and equivalently, by reservation for indication The SGS of PCI grou or the PSS used to indicate the number IDs in each grou is implemented.

Specifically, the process of the first base station transmitting the cell identifier of the first base station may be as follows:

Step 1: The first base station determines a cell identifier of the first base station according to its own clock peer state and a first preset rule.

Step 2: The first base station determines a primary peer sequence PSS and/or a secondary sequence SSS according to the cell identifier.

In a specific implementation, the first base station may first determine its cell identifier according to the foregoing method, and then determine a primary peer sequence PSS and/or a secondary sequence sss according to the cell identifier.

Step 3: The first base station sends the primary synchronizing sequence PSS and/or the auxiliary synchronizing sequence SSS to the second base station. Step 4: The second base station determines a cell identifier of the first base station according to the primary peer sequence PSS and/or a secondary sequence SSS.

The second base station may determine the cell ID of the first base station by reading the PSS and/or SSS sent by the first base station during the search process of the same source base station, and then pass between the predefined cell ID and the clock peer state. Corresponding relationship, determining a clock peer state of the first base station, if the second base station determines that the clock of the first base station is reliable and/or the type of the clock peer has a high priority, the second base station may use the first base station as A candidate peer base station, or directly using the first base station as a peer base station.

In addition, for the cell ID transmission of the first base station, a manner of using a backhaul link may be adopted in addition to the air interface. The cell identity can be an ECGI marked by a higher layer. When the backhaul link is used, the process in which the first base station interacts with the second base station and the second base station determines the clock peer state of the first base station may be as follows:

Step 1: The first base station determines the cell according to its own clock peer state and the first preset rule.

ID.

Step 2: The first base station sends the cell ID to the second base station by using a backhaul link.

Step 3: The second base station determines, according to the cell ID, a clock peer state of the first base station.

The cell ID is sent to the second base station by using a backhaul link. In a specific implementation, the cell ID may be sent to the second base station by using a centralized controller, or may be sent to the second base station by using a macro base station. The second base station sends the cell ID.

It should be noted that, in the above two implementation manners, if the first base station and the second base station belong to different operators, optionally, different operators need to negotiate through negotiation or paper protocol or other methods. Or determine the reserved cell ID information, so that the base stations of different operators have the same understanding of the correspondence between the cell ID and the clock peer state.

In the second optional implementation manner, in step 602 of the foregoing method embodiment, the clock peer state of the first base station may be directly indicated by using the reserved PSS and/or the SSS.

In the first optional implementation manner described above, the clock peer type is also indicated by the PSS and the SSS (constituting the cell identifier cell ID), but in the second alternative implementation, directly through the PSS and \ or SSS indicates the state of the clock peer, where the cell identity is not involved.

In the specific implementation, it can be specified that only one of the PSS and the SSS is used to directly indicate the same clock. The 歩 type can also indicate the clock peer type by both PSS and SSS. Specifically, the method for the second base station to determine the clock peer state of the first base station may be as follows (specified by using only the PSS indication clock peer type as an example):

Step 1: The first base station determines a primary peer sequence PSS of the first base station according to its own clock peer state and a sixth preset rule.

Step 2: The first base station sends a primary peer sequence PSS of the first base station to a second base station. It should be noted that, in the actual transmission process, the first base station usually sends the PSS and the SSS together. Step 3: The second base station determines a clock peer state of the first base station according to a primary peer sequence PSS of the first base station.

When the SSS is used to indicate the clock type, or the PSS and SSS are both used to indicate the clock type, the method is similar. You only need to change the PSS in the above three steps to SSS, or change to PSS and SSS is OK, so I won't go into details.

The above method uses only one of the PSS and the SSS, or the method of directly indicating the clock peer type by using the PSS and the SSS, and the same manner can also be adopted by the air interface or the backhaul link.

It should be noted that, in the foregoing second optional implementation manner, if the first base station and the second base station belong to different operators, optionally, different operators need to negotiate or a paper protocol or In other manners, the information of the reserved PSS or SSS is exchanged or determined, so that the base stations of different operators have the same understanding of the correspondence between the PSS or the SSS and the clock peer state.

The second base station may determine, according to the type of the clock peer, whether the first base station can be used as the clock source base station, and the clock peer type is indicated by the PSS and the SSS, and the specific implementation method and the first optional implementation manner are introduced. The method of indicating the clock type by the cell ID is similar, and will not be described here.

In a third optional implementation, in step 602 of the foregoing method embodiment, one or more sequences may be introduced to indicate a clock peer state of the first base station. The sequence can be sent by means of air interface signaling.

Specifically, the step 602 of the foregoing method embodiment may include:

Step 1: The first base station determines at least one sequence according to its own clock peer state and a second preset rule.

Step 2: The first base station sends the sequence by means of air interface signaling;

Step 3: The second base station determines the first according to the sequence and the second preset rule The clock state of the base station.

a predetermined time interval between a transmission time position of the sequence and the PSS or the SSS transmission time position, and/or a transmission frequency position of the sequence and a position of the PSS or the SSS transmission frequency Has a preset frequency interval. In one aspect, the second base station may indicate a clock peer state by using the sequence at a determined time position and a determined frequency location, for example, indicating whether the clock peer is reliable, and on the other hand, the second base station may also determine A different sequence of time positions and determined frequency positions are present to indicate the clock peer state.

Therefore, the foregoing step 2 may include: sending, by the first base station, the primary synchronizing sequence PSS and/or the auxiliary synchronizing sequence SSS, and at least one sequence to the second base station.

The sequence of the transmission may include a transmission time position, a transmission frequency position, and a sequence format. The transmission format may be directly learned by the first base station and the second base station in a predefined manner. The predefined specific implementation manner may include any one of the following. Or a combination thereof: a factory setting of the first base station and the second base station, a centralized controller such as an OAM configuration, an MME configuration, a coordinator or a Ε-coOTdinatOT configuration, or an Acer with a wireless or wired interface with the first base station and the second base station Station configuration.

The transmission frequency position of the sequence may be indicated by a determined frequency interval between the PSS or SSS transmission frequency positions, or may be determined by a transmission bandwidth having a determined frequency interval and sequence between the PSS or SSS transmission frequency positions. These parameters can also be made known to the first base station and the second base station in a predefined manner. The form of the sequence may be obtained by at least one of the following methods, generated by a pseudo-random sequence, or generated by a Zadoff-Chu sequence, or generated by a machine-generated sequence. For example, the sequence form of the sequence may be different from the application in the existing LTE system. The 4th PSS sequence outside the 3 PSS sequences. Specifically, the transmission frequency position may be indicated by any one of the following methods: using an occupied subcarrier index; and using an occupied resource block (RB, Resource Block) index. For example, the determined frequency interval may be expressed as a specific subcarrier index or a specific RB index relative to the PSS or SSS transmission frequency position, the number of offset subcarriers or the number of RBs, and the transmission bandwidth of the sequence may be an integer number of subcarriers. It is represented by a carrier or an integer number of RBs.

The transmission time position of the sequence may be indicated by a determined time interval from the PSS or SSS transmission time position; it may also be indicated by a specific period and a subframe offset within the period. Specifically, the transmission time position of the sequence may be indicated by any one of the following methods: using an OFDM index number; using a subframe index number and an OFDM index number; using a radio frame The index number, the subframe index number, and the OFDM index number are represented by: the slot index number and the OFDM index number; and are represented by the radio frame index number, the slot index number, and the OFDM index number. The determined time interval may be represented by N OFDM symbols. When the indication method is used, if the OFDM index number determined by the time interval is not within the range of the OFDM index number (0 to 13) within one subframe or no longer The OFDM index number in the slot indicates that the OFDM symbol determined by the time interval is not in the current subframe or in the current slot.

The following is an example of a frequency division duplex (FDD) system to illustrate the implementation of the implementation method. It should be noted that the method can also be applied to a TDD system.

Figure 7 is a schematic diagram showing the time-frequency distribution of PSS and SSS in the FDD system, as shown in Figure 7,

The primary synchronization channel (P-SCH) of the PSS and the secondary synchronization channel (S-SCH) carrying the SSS are distributed in the frequency domain over the middle 6 RBs of the entire system bandwidth. Up, every 5ms is sent in time. For the FDD system, the P-SCH and the S-SCH are transmitted in the 0th subframe and the 5th subframe, and the 5th OFDM symbol and the 6th OFDM symbol respectively located in the subframe. . In the LTE system, one RB is a time-frequency resource block composed of 12 subcarriers and 7 OFDM symbols.

Based on FIG. 7, and the position where the PSS transmission time position has a certain time interval, it can be understood that the time position of the P-SCH carrying the PSS (ie, the 5th OFDM symbol) has a certain time interval, as described above, if The time position of the PSS transmission is represented by M (in this example, M=5), and the determined time interval is represented by N OFDM symbols, then M+N represents the transmission time position of the sequence, and N may be a positive integer or a negative Integer, specifically, if the maximum value of the OFDM symbol index supported by the system is K, then the OFDM index number where the transmission time position of the sequence is located can be determined by "(M+N) MOD K", using (M+N) /K Downwardly, the relationship between the subframe index number of the OFDM symbol in which the transmission time position of the sequence is located and the subframe index number in which the PSS is located is determined. Specific examples are as follows: for example, M=5, N=3, K=14, then (M+N) MOD K=8, (M+N) /K rounded down to 0, indicating the transmission time position of the sequence The #8th OFDM symbol located in the same subframe as the subframe in which the PSS is located; for example, M=5, N=9, K=14, Bay lj (M+N) MOD K=0, (M+N) If /K is rounded down to 1, it means that the transmission time position of the sequence is located at the 0th OFDM symbol of the next subframe of the subframe in which the PSS is located.

Based on Figure 7, and the PSS transmission frequency position has a position of a determined frequency interval, for example, sent by PSS The highest frequency point in the transmission frequency position is the reference (indicated by A), and the frequency interval is represented by an integer number of subcarriers (indicated by B), then the highest frequency point of the transmission frequency position of the sequence can be determined as A+B or the lowest frequency point. Determined as A+B, specifically indicating the highest frequency point or the lowest frequency point, can be achieved in a predefined way. By sending the bandwidth, the transmission frequency position of the sequence can be determined.

It should be noted that, in the foregoing description, the PSS transmission is taken as an example, and the transmission time position and the transmission frequency position of the sequence are determined according to the PSS description based on the SSS transmission time position and the transmission frequency position.

In addition, in the existing LTE system, the PSS and the SSS are sent twice in each radio frame. To save the system overhead on the first base station side, the sequence is determined by a certain time interval and frequency interval between the pass and the PSS or the SSS. The method of transmitting the time position and the frequency time position can be entered in a specified sequence only once in each radio frame.

It should be noted that, in the foregoing third optional implementation manner, the second base station may detect at a preset sending position and/or a preset frequency position, determine whether the sequence exists, or determine the received sequence. Why is the sequence to determine the clock peer state of the first base station.

Further, in addition to indicating the clock peer state of the first base station by using the introduced sequence, the sequence of the sequence may be used to indicate the clock peer state of the first base station. For example, introducing a first sequence having multiple formats, when the first sequence is transmitted at the first frequency position, indicating that the clock of the first base station is reliable, and when the first sequence is sent at the second frequency position, indicating The clock of a base station is unreliable; or, for example, when the first sequence is transmitted at different time positions or frequency positions, indicating different clock synchronizing types of the first base station. Specifically, the step 602 of the method embodiment may include:

Step 1: The first base station determines a format of the sequence according to its own clock peer state and a third preset rule.

Step 2: The first base station sends the sequence to the second base station according to the format. Step 3: The second base station determines, according to the format of the sequence, a clock peer state of the first base station. .

The first base station may be configured according to its own clock peer state and the learned sequence format, where the sequence format includes at least one of a transmission time position, a transmission frequency position, and a sequence form, and determines whether a specified transmission time position and a transmission frequency are required. The position is transmitted in sequence, or it is determined that the clock transmission mode is indicated by a different transmission pattern form of the sequence. For example, if the clock of the first base station is reliable, the first base station may send the sequence according to a preset transmission pattern, and conversely, if the first base station If the clock is unreliable, the first base station may not transmit the sequence according to the preset transmission pattern. Of course, the preset transmission pattern can also be used to indicate that the clock peer is unreliable. In this case, if the clock of the first base station is reliable, the first base station may not send the sequence according to the preset transmission pattern.

The second base station can learn the correspondence between the clock peer state and the format of the sequence in a predefined manner. The second base station acquires the timing position of the first base station by reading the PSS and the SSS sent by the first base station, and determines the cell ID of the first base station, and then detects the sequence according to the third preset rule. . The second base station determines the clock peer state of the first base station by detecting the presence or absence of a sequence or a different transmission pattern of the sequence. It should be noted that, because the second base station reads the PSS and the SSS sent by the first base station, only the frame boundary of the first base station transmission time, that is, the 10 ms boundary, can be determined. Therefore, if the sequence of the predefined indication sequence is more than 10 ms. The second base station also needs to read a physical broadcast channel (Physical Broadcast Channel, PBCH) sent by the first base station to determine a system frame number (SFN) of the first base station, thereby determining a sequence transmission time. position.

It should be noted that, if the first base station and the second base station belong to different operators, optionally, different operators can determine the sequence sending pattern information and the sequence and the clock through negotiation or paper protocol or other means. The correspondence between the states of the , is such that the base stations of different operators agree on the understanding of the correspondence between the transmission pattern of the sequence and the state of the clock peer.

In a specific implementation, the clock peer status may be indicated by a predefined network listening reference signal NLRS format (NLRS pattern). The NLRS pattern includes the transmission time position of the NLRS, the transmission frequency position, and the transmission sequence form. The method described in this implementation manner may be adopted for the transmission time position, the transmission frequency position, and the transmission sequence form of the NLRS. For example, the NLRS transmitted in the Nth subframe of the Mth radio frame indicates that the clock is reliable, and the NLRS transmitted in the Kth subframe in the Mth radio frame indicates that the clock is unreliable, wherein M, N, K is an integer not less than 0, and Ν and Κ may be equal or unequal. If Ν and Κ are equal, it is also possible to confirm whether the clock peer is reliable by the frequency position of the NLRS transmission in the first (or Κ) subframe.

The first base station may determine the NLRS pattern to be transmitted according to the third preset rule according to its own peer state, or may also pass through a centralized controller (such as OAM, MME), and the first base station has a wireless or wired interface. The station directly implements the configuration according to the third preset rule according to the clock state of the first base station. When the configuration is implemented, the centralized controller and the macro base station having the wireless or wired interface of the first base station first learn the first The clock state of a base station. E.g, The first base station may report the clock peer state of the first base station to the centralized controller, and the macro base station having the wireless or wired interface of the first base station first knows the clock peer state of the first base station.

The second base station can learn the correspondence between the NLRS pattern and the clock peer state in a predefined manner. The second base station determines the timing information and the frequency information of the signal sent by the first base station by reading the PSS and the SSS sent by the first base station in the search process of the same source base station, and then determining the possible existence according to the predefined NLRS pattern. The NLRS pattern transmits the location, and by blind detection, detects whether the NLRS pattern indicating the clock peer state exists. If the reserved NLRS pattern for indicating whether the clock is the same is more than 10 ms, the second base station needs to read the PBCH of the first base station to determine the system frame number SFN of the first base station, thereby determining the reserved NLRS pattern. The sending time location. Then, the second base station determines the clock peer state of the first base station according to the format of the sequence and the third preset rule.

In addition, in the third alternative implementation described above, the clock peer type may also be indicated by a sequence or a sequence format. The clock peer type may include at least one of a clock peer source, an operator of the first base station, a base station type of the first base station, and an identity of the first base station, and specifically, the sequence may be specified, or Corresponding relationship between the format of the sequence and the source of the various clocks, or specifying the sequence, or the correspondence between the format of the sequence and the operator of the base station, or specifying the sequence, or the format of the sequence Correspondence with the type of base station.

In a specific implementation, one method is: a first sequence can be introduced to represent a clock source as a GNSS, a second sequence represents a clock peer source as a wired network, and a third sequence represents a clock peer source as a macro base station, such that The second base station may determine the source of the clock of the first base station according to the sequence sent by the first base station. Of course, only one sequence may be introduced, and different clock sources are distinguished by different formats of the sequence, so as to determine whether the source can be The first base station serves as the same source base station; one method is: assigning different sequences to different operators, for example, the base station belonging to the first operator adopts a fourth sequence, so that the second base station can determine the first sequence according to the sequence An operator to which the base station belongs to determine whether the first base station can be used as the same source base station; the base station belonging to the second operator adopts the cell ID in the second range; another method is to allocate with different types of base stations Different sequences, such that the second base station can determine the type of the first base station according to the sequence of the first base station, thereby determining whether The first base station can be used as the same source base station. Another method is: assigning different cell IDs to the first base stations having different identities, for example, using a cell ID in the first range for a base station or a cluster of base stations in a cluster of base stations that directly implement the same clock source through the external source. For non-directly through the outside world A non-header in a base station or a cluster of base stations that implements clock synchronization uses a cell ID in a second range, where a cluster of base stations may be a plurality of base stations densely deployed within a certain geographical area, and the clusters may be divided. It is defined by the carrier deployment. The header here can be a base station in a cluster of base stations that acquires the same clock with the source through the cluster clock. The non-header is the base station in the cluster of base stations that obtains the same clock through the header.

In a fourth optional implementation manner, in step 602 of the foregoing method embodiment, the bit state of the clock may be indicated by using a bit carried by the PBCH or by using a binary form, for example, The lbit information indicates the clock peer status.

Which bit contained in the PBCH and the correspondence between the different contents indicated by the bit and the clock peer state can be made known to the first base station and the second base station in a predefined manner.

Specifically, the step 602 of the foregoing method embodiment may include:

Step 1: The first base station carries its own clock peer state in a preset bit in the physical broadcast channel PBCH;

Step 2: The first base station sends the physical broadcast channel PBCH to the second base station. Step 3: The second base station determines, according to the preset bit and the fourth preset rule in the physical broadcast channel PBCH The clock of the first base station is in the same state.

The first base station may determine, according to its own clock peer state, a specific indication content of the bit in the PBCH indicating whether the clock peer is reliable and/or the clock peer type, for example, 1 is reliable, 0 is unreliable, or 1 is used. The representation is unreliable, 0 means reliable; or, the X-bit information can be used to indicate the clock peer type in the form of a bitmap, or the clock type can be indicated in binary form by the y-bit information, where X, y are Integer.

The second base station can learn, by a predefined manner, a correspondence between the indication content of the preset bit and the clock peer state, that is, the fourth preset rule. The second base station obtains the clock peer information of the first base station by reading the PSS and the SSS sent by the first base station, and then, by receiving and parsing the PBCH sent by the first base station, Indicates the content of the bit indication of the clock peer state, and further determines the clock peer state of the first base station. The second base station performs the same source base station search process, which may be performed when the second base station is just powered on, or the second base station re-searches for the same source.

It should be noted that, if the first base station and the second base station belong to different operators, optionally, different operators need to interact or determine PBCH through negotiation or paper protocol or other means. The position of the bit used to indicate the clock peer state and the correspondence between the content indicated by the bit and the clock peer state, so that the base stations of different operators have a unified understanding of the bit position and the bit indication content.

In addition, in the fourth optional implementation described above, the clock peer type may also be indicated by a preset bit carried by the PBCH. The clock peer type may include at least one of a clock peer source, an operator of the first base station, a base station type of the first base station, and an identity of the first base station. Specifically, the preset bit and each may be specified. The correspondence between the clock source and the source, or the correspondence between the preset bit and the operator of the base station, or the correspondence between the preset bit and the type of the base station.

In the specific implementation, different clocks can be indicated in the form of bitmaps, and different clocks can be indicated in binary form. For example, two-bit information can be used to indicate four different clocks in the binary state, or two bits of information can be used to indicate two different clocks in the form of a bitmap. One method is: the first type indicated by the preset bit, for example, 00, the content representing the clock source is GNSS, and the second content indicated by the preset bit, for example, 01, represents that the source of the clock is the wired network. The third content indicated by the preset bit, for example, 11, represents that the source of the clock is the macro base station, so that the second base station can determine the source of the clock of the first base station according to the content of the preset bit, thereby determining whether the The first base station is used as a peer base station; a method is: indicating, by using a preset bit, information of a carrier that is dependent on the base station, so that the second base station can determine, according to the preset bit, the operator to which the first base station belongs, thereby determining Whether the first base station can be used as the same source base station; another method is to indicate the type of the base station by using a preset bit, so that the second base station can determine the type of the first base station according to the preset bit of the first base station, thereby determining Whether the first base station can be used as the same source base station. Another method is to indicate the identity of the base station with a preset bit, for example, 1 for the header, 0 for the non-header, or 1 for the non-header, 0 for the header, and PBCH.

In a fifth optional implementation, for the step 602 of the foregoing method embodiment, the clock peer status may be indicated by a predefined peer level. For example, the maximum peer level or reserved peer level that can be supported in the system can be used to indicate whether the clock peer is reliable or the different peer classes that can be supported in the system can be different. . Further, the peer level can be represented by different cell identifiers, different sequence formats, and preset bits in the PBCH.

Specifically, the step 602 of the foregoing method embodiment may include: Step 1: The first base station determines a peer level of the first base station according to its own clock peer state and a fifth preset rule.

Step 2: The first base station sends a peer level of the first base station to the second base station on a physical layer channel;

Step 3: The second base station determines a clock peer state of the first base station according to the peer class and the fifth preset rule.

The first base station selects an appropriate peer level according to its own peer state, and the relationship between the learned peer class and the indicated clock peer state (ie, the fifth preset rule). Alternatively, the centralized controller, and the macro base station having the wireless or wired interface of the first base station, can directly implement the peer class of the first base station according to the clock peer state configuration of the first base station, and when adopting the configuration mode, It is also required that the centralized controller and the macro base station having the wireless or wired interface with the first base station first know the clock peer state of the first base station. For example, the first base station may report the clock peer state of the first base station to the centralized controller, and the macro base station having the wireless or wired interface of the first base station first knows the clock peer state of the first base station.

The first base station may add the peer class to the existing physical layer channel for transmission. The physical layer channel may be any one of the following: PBCH, a channel carrying a system information block (SIB), paging Paging, physical downlink control channel (Physical Downlink Control Channel, PDCCH), Enhanced PDCCH (Physical Downlink Data Channel, PDSCH), or may be attached to different NLRSs. In the pattern, different NLRS patterns can represent different peer classes. Of course, other methods are also used, which are not limited in this embodiment of the present invention.

The second base station can learn the correspondence between the clock peer state and the peer class in a predefined manner. Further, the second base station can also learn the manner in which the first base station sends the peer class in a predefined manner. Which channel is used to transmit the peer level information as described above; or, the first base station can notify the second base station of the manner in which it transmits the peer class by means of signaling.

The second base station determines the clock peer state of the first base station by reading the peer relationship level sent by the first base station and the correspondence between the learned peer class and the clock peer state during the search process of the same source base station. .

It should be noted that, if the first base station and the second base station belong to different operators, optionally, different operators need to determine the peer level and time by negotiation or paper agreement or other means. Whether the clocks have the same relationship between the peers, so that the base stations of different operators are used to indicate which peers are reliable and/or unreliable, and which peers are used to indicate which clocks are of the same type. Consistent.

In the specific implementation, it can be extended for the current peer level, and different peer classes are set for different clock sources; different levels are set for different operators; different peer classes are set for different base station types. ; or set different peer ratings for base stations with different identities. And the smaller the peer level can be set, the higher the reliability of the same clock.

In a sixth optional implementation manner, in step 602 of the foregoing method embodiment, the second base station may be informed of the clock state of the first base station by using a UE-assisted manner.

Specifically, the foregoing step 602 can include:

Step 1: The first base station sends a clock peer state of the first base station to the UE through a physical layer channel.

The physical layer channel includes: a peer-to-peer channel SCH, a physical broadcast channel PBCH, a channel carrying a system information block SIB, a paging channel, a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, and a physical downlink shared channel PDSCH. .

Step 2: The UE sends a clock peer state of the first base station to the second base station by using an uplink transmission channel.

In a specific implementation, a UE that can receive the signals of the first base station and the second base station can be selected as the secondary UE, and the first base station can notify the secondary UE of the clock state information of the first base station by using a physical layer channel, where the secondary UE can The clock state information of the first base station is used to notify the second base station by using the uplink transmission channel. The time resource, the frequency resource, and the sequence resource occupied by the clock state information of the first base station in the uplink transmission channel may be defined in advance. Therefore, the second base station can detect whether the energy exceeds the set threshold on the fixed time resource and the frequency resource to determine the clock peer state of the first base station, and can also detect different sequences on the fixed time resource and the frequency resource. To distinguish the clock peer state of the first base station. The specific format of the physical layer channel occupied by the first base station to notify the secondary UE of the clock state information may also be defined in advance or obtained by UE blind detection.

It should be noted that the foregoing specific implementation manners in the foregoing embodiments or various implementation manners of the present invention may include any one or a combination of the following: factory settings, OAM configuration, and configuration of the first base station and the second base station, MME configuration, other centralized controllers such as coordinator or E-coordinator Configuration, or, a macro base station configuration with a wireless or wired interface with the first base station and the second base station.

It should be noted that, in the embodiments of the present invention or in various implementation manners, information transmission between the first base station and the second base station, for example, information such as cdl ID, sequence, peer class, or other information may be transmitted. In the air interface mode or the backhaul link mode, more specifically, the air port or the backhaul link may be directly used for interaction, or may be transmitted through a centralized controller or through a macro base station.

It should be noted that whether the clock peer is reliable, the priority of different clock peer types, and various preset rules for determining the clock peer state (such as the first preset rule, the second preset rule The first protocol and the second base station can be implemented by the network side configuration, for example, by the OAM configuration, by the macro base station configuration, or by the behavior of the base station side, such as the factory setting. Mutual knowledge. Different operators can define the above content through negotiation or paper protocol, so as to ensure that the base stations belonging to different operators have the same understanding of the above contents.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, when executed, The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A clock synchronization device, characterized in that it includes:

A receiving module, configured to receive the clock synchronization status of at least one first base station;

a determining module, configured to determine a synchronization source base station according to the clock synchronization status of the first base station; a synchronization module, configured to synchronize according to the clock information of the synchronization source base station;

Wherein, the clock synchronization status includes whether the clock synchronization is reliable and\or the clock synchronization type, and the clock synchronization type of the first base station includes the clock synchronization source of the first base station, the operator to which the first base station is affiliated, At least one of the base station type of the first base station and the identity of the first base station.

2. The device according to claim 1, wherein the receiving module is specifically configured to: receive the clock synchronization status of the first base station through air interface signaling.

3. The device according to claim 1, wherein the receiving module is specifically configured to: receive the clock synchronization status of the first base station through a backhaul link; or, receive the clock synchronization status through a centralized controller. The clock synchronization status of the first base station, which is reported by the first base station to the centralized controller; or,

The clock synchronization status of the first base station is received by the macro base station, and the clock synchronization status of the first base station is reported by the first base station to the macro base station.

4. The device according to any one of claims 1 to 3, characterized in that the receiving module is specifically used for:

receiving a cell identity of at least one first base station;

The clock synchronization status of the first base station is determined according to the cell identity of the first base station and the first preset rule.

5. The device according to claim 2, wherein the receiving module is specifically configured to: receive the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS sent by the first base station;

According to the main synchronization sequence? 88 and/or auxiliary synchronization sequence SSS and the sixth preset rule determine the cell identity of the first base station.

6. The device according to claim 2, wherein the receiving module is specifically configured to: receive a sequence sent by the first base station, and determine the clock of the first base station according to the sequence and the second preset rule. Synchronous status.

7. The device according to claim 6, wherein the receiving module is specifically configured to: receive by the second base station the main synchronization sequence sent by the first base station? 88 and\or auxiliary synchronization sequence SSS, and at least one sequence, there is a preset time interval between the transmission time position of the sequence and the PSS or the SSS transmission time position, and/or the transmission frequency position of the sequence is consistent with the PSS or the SSS transmission time position. There is a preset frequency interval between the SSS transmission frequency positions.

8. The device according to claim 6 or 7, characterized in that the receiving module is specifically used for:

The clock synchronization status of the first base station is determined according to the format of the sequence and a third preset rule.

9. The device according to claim 2, wherein the receiving module is specifically configured to: read preset bits in the physical broadcast channel PBCH sent by the first base station;

The clock synchronization status of the first base station is determined according to the preset bits in the PBCH and the fourth preset rule.

10. The device according to claim 2, wherein the receiving module is specifically configured to: read the synchronization level sent by the first base station in the physical layer channel;

The clock synchronization status of the first base station is determined according to the synchronization level and a fifth preset rule.

1 1. The device according to claim 2, wherein the receiving module is specifically configured to: receive the clock synchronization status of the first base station sent by the UE through an uplink transmission channel, and the clock of the first base station The source synchronization status is sent by the first base station to the UE through a physical layer channel.

12. The device according to claim 10 or 11, characterized in that the physical layer channel includes at least one of the following: synchronization channel SCH, physical broadcast channel PBCH, bearer system information block

SIB channel, paging channel, physical downlink control channel PDCCH, enhanced physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.

13. A clock synchronization device, characterized by including:

Determining module, used to determine its own clock synchronization status. The clock synchronization status of the first base station includes whether the clock synchronization of the first base station is reliable and/or the clock synchronization type. The clock synchronization status of the first base station The synchronization type includes at least one of the clock synchronization source of the first base station, the operator to which the first base station belongs, the base station type of the first base station, and the identity of the first base station;

A sending module, configured to send the clock synchronization status of the first base station to the second base station, so that the second base station determines the synchronization source base station based on the clock synchronization status of the first base station, and determines the synchronization source base station based on the clock synchronization status of the first base station. clock information for synchronization.

14. The device according to claim 13, wherein the sending module is specifically configured to: send the clock synchronization status of the first base station through air interface signaling.

15. The device according to claim 13, wherein the sending module is specifically configured to: send the clock synchronization status of the first base station through a backhaul link; or, send the clock synchronization status of the first base station to The clock synchronization status is reported to the centralized controller, so that the centralized controller sends the clock synchronization status of the first base station to the second base station; or,

Report the clock synchronization status of the first base station to the macro base station, so that the macro base station sends the clock synchronization status of the first base station to the second base station.

16. The device according to any one of claims 13 to 15, characterized in that the sending module is specifically used for:

Send the cell identifier of the first base station to the second base station, so that the second base station determines the clock synchronization status of the first base station based on the cell identifier of the first base station and the first preset rule.

17. The device according to claim 14, wherein the sending module is specifically configured to: determine the main synchronization sequence according to its own clock synchronization status and the sixth preset rule? 88 and\or auxiliary step sequence SSS;

Send the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS to the second base station, so that the second base station determines the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS. cell identifier of the first base station.

18. The device according to claim 14, wherein the sending module is specifically configured to: determine at least one sequence according to its own clock synchronization status and the second preset rule;

The sequence is sent through air interface signaling, so that the second base station determines the clock synchronization status of the first base station according to the sequence and the second preset rule.

19. The device according to claim 18, characterized in that,

There is a preset time interval between the transmission time position of the sequence and the PSS or SSS transmission time position, and/or there is a preset time interval between the transmission frequency position of the sequence and the PSS or SSS transmission frequency position. With preset frequency intervals;

The sending module is specifically used for:

The primary synchronization sequence PSS and/or the secondary synchronization sequence SSS, and at least one of the sequences are sent to the second base station.

20. The device according to claim 18 or 19, characterized in that the sending module is specifically used for:

Determine the format of the sequence according to its own clock synchronization status and a third preset rule; send the sequence to the second base station according to the format, so that the second base station determines the sequence according to the format of the sequence Describe the clock synchronization status of the first base station.

21. The device according to claim 14, wherein the sending module is specifically configured to: carry its own clock synchronization status in preset bits in the physical broadcast channel PBCH; send to the second base station The physical broadcast channel PBCH is used to enable the second base station to determine the clock synchronization status of the first base station according to preset bits in the physical broadcast channel PBCH and a fourth preset rule.

22. The device according to claim 14, wherein the sending module is specifically configured to: determine the synchronization level of the first base station according to its own clock synchronization status and a fifth preset rule;

Send the synchronization level of the first base station to the second base station on the physical layer channel, so that the second base station determines the clock of the first base station based on the synchronization level and the fifth preset rule Synchronous status.

23. The device according to claim 14, wherein the sending module is specifically configured to: send the clock synchronization status of the first base station to the UE through a physical layer channel, so that the UE passes the uplink transmission channel Send the clock synchronization status of the first base station to the second base station.

24. The device according to claim 22 or 23, characterized in that the physical layer channel includes at least one of the following: synchronization channel SCH, physical broadcast channel PBCH, channel carrying system information block SIB, paging channel, physical Downlink control channel PDCCH, enhanced physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.

25. A base station, characterized by including:

a receiver configured to receive the clock synchronization status of at least one first base station,

A processor, configured to determine a synchronization source base station according to the clock synchronization status of the first base station; the processor is also configured to synchronize according to the clock information of the synchronization source base station;

26. The base station according to claim 25, wherein the receiver is specifically configured to: receive the clock synchronization status of the first base station through air interface signaling.

27. The base station according to claim 25, wherein the receiver is specifically configured to: receive the clock synchronization status of the first base station through a backhaul link; or, receive the clock synchronization status of the first base station through a centralized controller. The clock synchronization status of the first base station, which is reported by the first base station to the centralized controller; or,

28. The base station according to any one of claims 25 to 27, characterized in that the receiver is specifically used for:

receiving a cell identity of at least one first base station;

29. The base station according to claim 26, wherein the receiver is specifically configured to: receive the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS sent by the first base station;

30. The base station according to claim 26, wherein the receiver is specifically configured to: receive the sequence sent by the first base station, and determine the clock of the first base station according to the sequence and the second preset rule. Synchronous status.

31. The base station according to claim 30, wherein the receiver is specifically configured to: receive the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS sent by the first base station, and at least one sequence, There is a preset time interval between the transmission time position of the sequence and the PSS or SSS transmission time position, and/or there is a preset time interval between the transmission frequency position of the sequence and the PSS or SSS transmission frequency position. With preset frequency intervals.

32. The base station according to claim 30 or 31, characterized in that the receiver is specifically used for:

33. The base station according to claim 26, characterized in that the receiver is specifically used for: Read the preset bits in the physical broadcast channel PBCH sent by the first base station;

34. The base station according to claim 26, wherein the receiver is specifically configured to: read the synchronization level sent by the first base station in the physical layer channel;

35. The base station according to claim 26, wherein the receiver is specifically configured to: receive the clock synchronization status of the first base station sent by the UE through an uplink transmission channel, and the clock source of the first base station The synchronization status is sent by the first base station to the UE through a physical layer channel.

36. The base station according to claim 34 or 35, characterized in that the physical layer channel includes at least one of the following: synchronization channel SCH, physical broadcast channel PBCH, channel carrying system information block SIB, paging channel, physical Downlink control channel PDCCH, enhanced physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.

37. A clock synchronization base station, characterized by including:

A processor configured to determine its own clock synchronization status. The clock synchronization status of the first base station includes whether the clock synchronization of the first base station is reliable and/or the clock synchronization type. The clock synchronization status of the first base station The synchronization type includes at least one of the clock synchronization source of the first base station, the operator to which the first base station belongs, the base station type of the first base station, and the identity of the first base station;

A transmitter configured to send the clock synchronization status of the first base station to the second base station, so that the second base station determines the synchronization source base station based on the clock synchronization status of the first base station, and determines the synchronization source base station based on the clock synchronization status of the first base station. clock information for synchronization.

38. The base station according to claim 37, wherein the transmitter is specifically configured to: send the clock synchronization status of the first base station through air interface signaling.

39. The base station according to claim 37, wherein the transmitter is specifically configured to: send the clock synchronization status of the first base station through a backhaul link; or, send the clock synchronization status of the first base station to The clock synchronization status is reported to the centralized controller, so that the centralized controller sends the clock synchronization status of the first base station to the second base station; or,

40. The base station according to any one of claims 37 to 39, characterized in that the transmitter is specifically used for:

41. The base station according to claim 38, characterized in that the transmitter is specifically configured to: determine the primary synchronization sequence PSS and\or the secondary synchronization sequence SSS according to its own clock synchronization status and the sixth preset rule ;

Send the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS to the second base station, so that the second base station can perform synchronization according to the primary synchronization sequence? 88 and/or auxiliary synchronization sequence SSS determines the cell identity of the first base station.

42. The base station according to claim 38, wherein the transmitter is specifically configured to: determine at least one sequence according to its own clock synchronization status and the second preset rule;

43. The base station according to claim 42, characterized in that,

The transmitter is specifically used for:

44. The base station according to claim 42 or 43, characterized in that the transmitter is specifically used for:

45. The base station according to claim 38, wherein the transmitter is specifically configured to: carry its own clock synchronization status in preset bits in the physical broadcast channel PBCH; and send to the second base station The physical broadcast channel PBCH, so that the second base station can The preset bits in the physical broadcast channel PBCH and the fourth preset rule determine the clock synchronization status of the first base station.

46. The base station according to claim 38, wherein the transmitter is specifically configured to: determine the synchronization level of the first base station according to its own clock synchronization status and a fifth preset rule;

47. The base station according to claim 38, characterized in that the transmitter is specifically configured to: send the clock synchronization status of the first base station to the UE through a physical layer channel, so that the UE passes the uplink transmission channel Send the clock synchronization status of the first base station to the second base station.

48. The base station according to claim 46 or 47, characterized in that the physical layer channel includes at least one of the following: synchronization channel SCH, physical broadcast channel PBCH, channel carrying system information block SIB, paging channel, physical Downlink control channel PDCCH, enhanced physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.

49. A clock synchronization method, characterized by including:

The second base station receives the clock synchronization status of at least one first base station,

The second base station determines the synchronization source base station according to the clock synchronization status of the first base station;

The second base station synchronizes according to the clock information of the synchronization source base station;

50. The method according to claim 49, characterized in that the second base station receives the clock synchronization status of at least one first base station, including:

The second base station receives the clock synchronization status of the first base station through air interface signaling.

51. The method according to claim 49, characterized in that the second base station receives the clock synchronization status of at least one first base station, including:

The second base station receives the clock synchronization status of the first base station through a backhaul link; or,

The second base station receives the clock synchronization status of the first base station through the centralized controller, The clock synchronization status of the first base station is reported to the centralized controller by the first base station; or, the second base station receives the clock synchronization status of the first base station through a macro base station, and the first base station The clock synchronization status of the base station is reported by the first base station to the macro base station.

52. The method according to any one of claims 49 to 51, characterized in that the second base station receives the clock synchronization status of at least one first base station, including:

The second base station receives the cell identity of at least one first base station;

The second base station determines the clock synchronization status of the first base station based on the cell identity of the first base station and the first preset rule.

53. The method according to claim 50, characterized in that the second base station receives the cell identity of at least one first base station, including:

The second base station receives the main synchronization sequence sent by the first base station? 88 and\or auxiliary synchronization sequence

SSS;

The second base station according to the main synchronization sequence? 88 and/or auxiliary synchronization sequence SSS and the sixth preset rule determine the cell identity of the first base station.

54. The method according to claim 50, characterized in that the second base station receives the clock synchronization status of the first base station through air interface signaling, including:

The second base station receives the sequence sent by the first base station, and determines the clock synchronization status of the first base station according to the sequence and the second preset rule.

55. The method according to claim 54, characterized in that the second base station reads the sequence sent by the first base station, including:

The second base station receives the main synchronization sequence sent by the first base station? 88 and/or auxiliary synchronization sequence SSS, and at least one sequence, there is a preset time interval between the sending time position of the sequence and the PSS or SSS sending time position, and/or the sending of the sequence There is a preset frequency interval between the frequency position and the PSS or SSS transmission frequency position.

56. The method according to claim 54 or 55, characterized in that the second base station determines the clock synchronization status of the first base station according to the sequence and a third preset rule, including:

The second base station determines the clock synchronization status of the first base station according to the format of the sequence and a third preset rule.

57. The method according to claim 50, wherein the second base station receives the clock synchronization status of the first base station through air interface signaling, including: The second base station reads the preset bits in the physical broadcast channel PBCH sent by the first base station;

The second base station determines the clock synchronization status of the first base station based on the preset bits in the PBCH and a fourth preset rule.

58. The method according to claim 50, characterized in that the second base station receives the clock source synchronization status of the first base station through air interface signaling, including:

The second base station reads the synchronization level sent by the first base station in the physical layer channel; the second base station determines the clock synchronization of the first base station based on the synchronization level and a fifth preset rule. state.

59. The method according to claim 50, characterized in that the second base station receives the clock synchronization status of the first base station through air interface signaling, including:

The second base station receives the clock synchronization status of the first base station sent by the UE through an uplink transmission channel. The information about the clock synchronization status of the first base station is sent by the first base station to the first base station through a physical layer channel. Described UE.

60. The method according to claim 50 or 59, characterized in that the physical layer channel includes at least one of the following: synchronization channel SCH, physical broadcast channel PBCH, carrying system information block

61. A clock synchronization method, characterized by including:

The first base station determines its own clock synchronization status. The clock synchronization status of the first base station includes whether the clock synchronization of the first base station is reliable and\or the clock synchronization type. The clock synchronization status of the first base station The type includes at least one of the clock synchronization source of the first base station, the operator to which the first base station belongs, the base station type of the first base station, and the identity of the first base station;

The first base station sends the clock synchronization status of the first base station to the second base station, so that the second base station determines the synchronization source base station according to the clock synchronization status of the first base station, and determines the synchronization source base station according to the first base station clock information for synchronization.

62. The method according to claim 61, characterized in that the first base station sends the clock synchronization status of the first base station to the second base station, including:

The first base station sends the clock synchronization status of the first base station through air interface signaling.

63. The method according to claim 61, characterized in that: the first base station transmits data to the second base station. The station sends the clock synchronization status of the first base station, including: :

The first base station sends the clock synchronization status of the first base station through a backhaul link; or,

The first base station reports the clock synchronization status of the first base station to the centralized controller, so that the centralized controller sends the clock synchronization status of the first base station to the second base station; or, The first base station reports the clock synchronization status of the first base station to the macro base station, so that the macro base station sends the clock synchronization status of the first base station to the second base station.

64. The method according to any one of claims 61 to 63, characterized in that the first base station sends the clock synchronization status of the first base station to the second base station, including:

The first base station sends the cell identity of the first base station to the second base station, so that the second base station determines the cell identity of the first base station based on the cell identity of the first base station and a first preset rule. Clock synchronization status.

65. The method according to claim 62, characterized in that the first base station sends the cell identity of the first base station to the second base station, including:

The first base station determines the main synchronization sequence according to its own clock synchronization status and the sixth preset rule.

PSS and\or auxiliary synchronization sequence SSS;

The first base station sends the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS to the second base station, so that the second base station transmits the primary synchronization sequence PSS and/or the secondary synchronization sequence SSS according to the primary synchronization sequence PSS and/or the secondary synchronization sequence The step sequence SSS determines the cell identity of the first base station.

66. The method according to claim 62, wherein the first base station sends the clock synchronization status of the first base station through air interface signaling, including:

The first base station determines at least one sequence according to its own clock synchronization status and a second preset rule;

The first base station sends the sequence through air interface signaling, so that the second base station determines the clock synchronization status of the first base station based on the sequence and the second preset rule.

67. The method according to claim 66, characterized in that,

The first base station sends the sequence through air interface signaling, including: The first base station sends the main synchronization sequence to the second base station? 88 and/or auxiliary synchronization sequence SSS, and at least one of said sequences.

68. The method according to claim 66 or 67, characterized in that the first base station sends the clock synchronization status of the first base station through air interface signaling, including:

The first base station determines the format of the sequence according to its own clock synchronization status and a third preset rule;

The first base station sends the sequence to the second base station according to the format, so that the second base station determines the clock synchronization status of the first base station according to the format of the sequence.

69. The method according to claim 62, wherein the first base station sends the clock synchronization status of the first base station through air interface signaling, including:

The first base station carries its own clock synchronization status in the preset bits in the physical broadcast channel PBCH,

The first base station sends the physical broadcast channel PBCH to the second base station, so that the second base station determines the first base station according to the preset bits in the physical broadcast channel PBCH and the fourth preset rule. Clock synchronization status.

70. The method according to claim 62, wherein the first base station sends the clock synchronization status of the first base station through air interface signaling, including:

The first base station determines the synchronization level of the first base station according to its own clock synchronization status and a fifth preset rule;

The first base station sends the synchronization level of the first base station to the second base station through a physical layer channel, so that the second base station determines the synchronization level based on the synchronization level and the fifth preset rule. Clock synchronization status of the first base station.

71. The method according to claim 62, wherein the first base station sends the clock synchronization status of the first base station through air interface signaling, including:

The first base station sends the clock synchronization status of the first base station to the UE through a physical layer channel, so that the UE sends the clock synchronization status of the first base station to the second base station through an uplink transmission channel.

72. The method according to claim 70 or 71, characterized in that the physical layer channel includes at least one of the following: synchronization channel SCH, physical broadcast channel PBCH, channel carrying system information block SIB, paging channel, physical Downlink control channel PDCCH, enhanced physical downlink control channel EPDCCH, physical downlink shared channel PDSCH.