CN109151920B - Method for transmitting synchronization signal and base station - Google Patents
Method for transmitting synchronization signal and base station Download PDFInfo
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- CN109151920B CN109151920B CN201710456148.XA CN201710456148A CN109151920B CN 109151920 B CN109151920 B CN 109151920B CN 201710456148 A CN201710456148 A CN 201710456148A CN 109151920 B CN109151920 B CN 109151920B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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Abstract
The invention provides a method for sending a synchronous signal and a base station, wherein the method for sending the synchronous signal comprises the following steps: the base station acquires a downlink synchronous signal, and after the base station is configured with a pre-configured compensation time delay, the base station sends the downlink synchronous signal to the terminal equipment so that the terminal equipment detects the downlink synchronous signal in a search window. Namely, the base station of the adjacent cell is actively configured with the compensation time delay, so that when the base station sends a downlink synchronization signal to the terminal, the distance between the terminal and the base station is compensated through the compensation time delay, and under the condition of not changing hardware, the distance difference between the base station of the adjacent cell and the base station of the main cell is eliminated, thereby avoiding the problem that the terminal equipment cannot detect the synchronization signal sent by the base station of the adjacent cell.
Description
Technical Field
The embodiment of the invention relates to the communication technology, in particular to a method for sending a synchronization signal and a base station.
Background
In a Long Term Evolution (LTE) system, in order to support mobility management of a terminal, that is, User Equipment (UE), and ensure continuity of a terminal service, the UE in a moving process may constantly search for a neighboring cell, acquire synchronization, and estimate reception quality of a cell signal, thereby determining whether to perform handover or cell reselection. Therefore, from the UE handover process, detecting and searching the downlink synchronization signal of the neighboring cell is a prerequisite condition for the subsequent measurement action of the neighboring cell, and is mainly divided into primary synchronization signal detection and secondary synchronization signal detection. After the uplink synchronization and the terminal transmission timing adjustment are completed, a Radio Resource Control (RRC) signaling flow is started to complete cell handover.
Fig. 1 is a schematic diagram of a handover scenario of a UE between a primary cell and a neighboring cell. As shown in fig. 1, in a handover zone, when a difference between a distance from a neighboring cell to a terminal and a distance from a serving cell to the terminal is too large (as in fig. 1, the neighboring cell is relatively too close to the terminal), a downlink synchronization signal of the neighboring cell arrives at the terminal, and the terminal is transmitting in an uplink subframe of a main zone, and at this time, the terminal cannot demodulate the downlink synchronization signal arriving in the neighboring cell, and even cannot initiate measurement on the neighboring cell, which easily causes handover failure and service interruption.
Disclosure of Invention
The sending method and the base station of the synchronization signal provided by the embodiment of the invention are used for solving the problems that a terminal cannot demodulate the downlink synchronization signal arriving in the adjacent cell, and cannot initiate measurement to the adjacent cell, so that the switching failure and the service interruption are easily caused.
A first aspect of an embodiment of the present invention provides a method for sending a synchronization signal, including:
a base station acquires a downlink synchronous signal;
and after the base station is configured with the compensation time delay in advance, the base station sends the downlink synchronous signal to the terminal equipment so that the terminal equipment detects the downlink synchronous signal in a search window.
Optionally, the base station includes a baseband processing unit BBU and a radio remote unit RRU, and before the base station sends the downlink synchronization signal to the terminal device after a pre-configured compensation delay, the method further includes:
and the BBU sends the pre-configured compensation delay to the RRU.
Optionally, the method further includes:
the RRU judges whether the compensation time delay exceeds the caching capacity of the RRU or not;
and if not, caching the compensation time delay by the RRU.
Optionally, after the pre-configured compensation delay, the base station sends the downlink synchronization signal to the terminal device:
the RRU adjusts downlink time delay according to the compensation time delay;
and the RRU sends the downlink synchronous signal to the terminal equipment according to the adjusted downlink time delay.
Optionally, the adjusting, by the RRU, the downlink delay according to the compensation delay includes:
the RRU judges whether a carrier wave is established;
and if the carrier is established on the RRU, refreshing a logic delay register value and an uplink and downlink time slot switching point register value according to the compensation delay to finish downlink delay adjustment.
Optionally, the method further includes:
if no carrier is established on the RRU, refreshing the logic delay register value according to the compensation delay in the process of waiting for the periodic delay configuration message of the BBU;
and refreshing the register value of the uplink and downlink time slot switching point according to the compensation time delay in the process of establishing the carrier according to the carrier establishment command sent by the BBU, and finishing downlink time delay adjustment.
A second aspect of the present invention provides a base station, including:
the processing module is used for acquiring a downlink synchronous signal;
and the transmission module is used for sending the downlink synchronization signal to the terminal equipment after the pre-configured compensation time delay so that the terminal equipment detects the downlink synchronization signal in the search window.
Optionally, the processing module includes a baseband processing unit BBU; the transmission module comprises a Radio Remote Unit (RRU), and the BBU sends the pre-configured compensation delay to the RRU after the pre-configured compensation delay and before the transmission module sends the downlink synchronization signal to the terminal equipment.
Optionally, the RRU determines whether the compensation delay exceeds a cache capacity of the RRU;
and if not, the RRU is also used for caching the compensation time delay.
Optionally, the RRU adjusts the downlink delay according to the compensation delay;
and the RRU sends the downlink synchronous signal to the terminal equipment according to the adjusted downlink time delay.
Optionally, the RRU is specifically configured to:
judging whether a carrier wave is established;
and if the carrier is established on the RRU, refreshing a logic delay register value and an uplink and downlink time slot switching point register value according to the compensation delay to finish downlink delay adjustment.
Optionally, the RRU is further configured to:
if no carrier is established on the RRU, refreshing the logic delay register value according to the compensation delay in the process of waiting for the periodic delay configuration message of the BBU;
and refreshing the register value of the uplink and downlink time slot switching point according to the compensation time delay in the process of establishing the carrier according to the carrier establishment command sent by the BBU, and finishing downlink time delay adjustment.
The third aspect of the present invention provides a base station, including: a memory storing program instructions, a processor for controlling execution of the program instructions, and a transceiver. The processor controls and executes the sending method of the synchronization signal provided by any one of the foregoing implementation manners of the first aspect.
According to the method and the base station for sending the synchronization signal, provided by the embodiment of the invention, the compensation time delay is actively configured on the base station of the adjacent cell, so that when the base station sends the downlink synchronization signal to the terminal, the distance between the terminal and the base station is compensated through the compensation time delay, the distance difference between the base station of the adjacent cell and the base station of the main cell is eliminated under the condition of not changing hardware, the problem that the terminal equipment cannot detect the synchronization signal sent by the base station of the adjacent cell is avoided, the terminal can demodulate the downlink synchronization signal arriving at the adjacent cell, the measurement is initiated on the adjacent cell, and the cell switching is completed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a handover scenario of a UE between a primary cell and a neighboring cell;
fig. 2 is a flowchart of a first embodiment of a method for sending a synchronization signal according to the present invention;
FIG. 3 is a schematic diagram of a BBU/RRU time delay measurement topology structure of a base station provided by the present invention;
fig. 4 is a schematic diagram of a downlink delay adjustable point of a base station according to the present invention;
fig. 5 is a flowchart of an example of a method for transmitting a synchronization signal according to the present invention;
fig. 6a is a schematic diagram of a downlink signal delay effect in the prior art;
fig. 6b is a schematic diagram of a downlink signal delay effect of a base station according to the present invention;
fig. 7 is a schematic structural diagram of a base station according to a first embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a handover scenario of a UE between a primary cell and a neighboring cell. As shown in fig. 1, in a handover zone of a terminal device (or called as a terminal, UE, etc.), when a difference between a distance from a neighboring cell to the terminal and a distance from a serving cell to the terminal is too large (the neighboring cell is relatively too close to the terminal), a downlink synchronization signal of the neighboring cell reaches the terminal, and the terminal is transmitting in an uplink subframe of a main zone, and at this time, the terminal cannot demodulate the downlink synchronization signal that the neighboring cell reaches, and even cannot initiate measurement on the neighboring cell, which is likely to cause handover failure and service interruption. The reason why the above problem occurs is that the terminal performs the search based on the timing advance of the current serving cell (primary cell) when performing the search for the downlink synchronization signal of the neighboring cell. When the distance between the adjacent cell and the terminal is too close, the situation that the wireless frame head of the adjacent cell reaches the terminal before the current service area occurs, when the frame head synchronizing signal of the adjacent cell exceeds too much forward and exceeds the searching window range of the current reference of the terminal, the terminal can directly discard the frame, so that the downlink synchronization with the adjacent cell cannot be obtained, and finally the terminal is disconnected from the network and fails in switching in the moving process.
For such a situation, a common method is to solve the problem by network optimization means of improving terminal hardware, enlarging the search window range, and increasing the coverage radius of the neighboring cell. However, the capabilities of terminal chips of different manufacturers are different, and for a base station (evolved Node B, eNB) side, it is not mandatory that all terminals make a search window large enough to meet the extreme requirement of site selection; meanwhile, for the constructed station, there are usually some construction restrictions, which make it difficult to implement the scheme of increasing the radius of the neighboring cell, and even if the radius of the neighboring cell can be increased, it is difficult to ensure that the increased radius of the neighboring cell is enough to compensate the difference in distance between the two cells and the terminal. Therefore, the present invention provides a method for transmitting a synchronization signal on the base station side to overcome this problem.
Fig. 2 is a flowchart of a first embodiment of a method for sending a synchronization signal, as shown in fig. 2, the method for sending a synchronization signal provided in this embodiment is applied to a base station side, specifically, to a base station side of a neighboring cell of a terminal, so that when the terminal is in a handover band, a downlink synchronization signal of the neighboring cell base station can be detected in a search window, and a specific implementation step of the method for sending a synchronization signal is as follows;
s101: the base station acquires a downlink synchronization signal.
S102: and after the pre-configured compensation time delay, the base station sends the downlink synchronization signal to the terminal equipment so that the terminal equipment detects the downlink synchronization signal in the search window.
In this step, the base station side of the neighboring cell needs to perform the configuration of the compensation delay, specifically, the distance difference between the terminal in the handover zone and the base station of the current serving cell and the base station of the neighboring cell may be measured, and the delay required for the distance difference in signal transmission may be determined, so that the compensation delay is determined according to the measurement, and is configured in advance on the base station side of the neighboring cell, so that when the base station obtains the downlink synchronization signal and sends the downlink synchronization signal to the terminal, the base station may perform the compensation for the distance difference according to the compensation delay and then send the downlink synchronization signal.
In a specific implementation of the scheme, a private protocol message (e.g., TDL IR private message) may be newly added between the BBU of the neighboring cell Base station and the RRU, and a user specifies the compensation delay at the BBU according to measurement or other specific conditions, and sends the specified compensation delay to the RRU via the BBU, and then the RRU dynamically updates the current delay according to the compensation delay or prestores the compensation delay according to the condition of the current cell of the terminal, and the compensation delay becomes effective after the cell is activated, specifically including the following two implementation manners:
in a first implementation manner, after a pre-configured compensation delay, before a base station sends the downlink synchronization signal to a terminal device, the method further includes: and the BBU sends the pre-configured compensation delay to the RRU.
The RRU of the base station updates the current delay amount according to the compensation delay and sends a downlink synchronization signal to the terminal device according to the new delay.
In a second implementation manner, after the pre-configured compensation delay, before the base station sends the downlink synchronization signal to the terminal device, the method further includes: and the BBU sends the pre-configured compensation delay to the RRU.
The RRU judges whether the compensation time delay exceeds the caching capacity of the RRU or not; and if not, caching the compensation time delay by the RRU.
In this scheme, whether the compensation delay is obtained in advance for buffering, and the buffer takes effect when the cell is activated, or the buffer takes effect directly when the compensation delay is received, the specific implementation manner of the base station sending the downlink synchronization signal is as follows: and the RRU adjusts the downlink time delay according to the compensation time delay, sends the downlink synchronous signal to the terminal equipment according to the adjusted downlink time delay, and compensates the distance difference between the terminal equipment and the base station of the current service cell and the base station of the adjacent cell.
In the sending method of the synchronization signal provided in this embodiment, the compensation delay is actively configured on the base station of the neighboring cell, so that when the base station sends the downlink synchronization signal to the terminal, the distance between the terminal and the base station is compensated through the compensation delay, and under the condition that hardware is not changed, the distance difference between the base station of the neighboring cell and the base station of the main cell is eliminated, thereby avoiding the problem that the terminal device cannot detect the synchronization signal sent by the base station of the neighboring cell, so that the terminal can demodulate the downlink synchronization signal that the neighboring cell arrives, initiate measurement on the neighboring cell, and complete cell switching.
FIG. 3 is a schematic diagram of a BBU/RRU time delay measurement topology structure of a base station provided by the present invention; fig. 4 is a schematic diagram of a downlink delay adjustable point of a base station provided by the present invention, as shown in fig. 3, for a BBU and an RRU # 1, a downlink direction T12 is an optical fiber delay amount, and a downlink direction T2a is an RRU internal delay amount, and in order to align downlink air interface signals of the base station, corresponding delay compensation may be selected on the BBU/RRU side, so that two delay configuration adjustable points may actually be provided in order to achieve the purpose of the present invention. As shown in fig. 4, Ttotal in fig. 4 is a total amount of time delay between data sent by the BBU in the downlink direction and an air interface of the RRU, that is: ttotal is BBU cache (DL CalBBU) + optical fiber delay (T12) + RRU cache (DL CalRRU) + RRU downlink delay (T2 a);
for TDL IR, Ttotal is a fixed value determined by the fiber pull-out distance (maximum support 40 km pull), and T12 and T2a are RRU measurement report values, so the delay compensation adjustable points are on DL CalBBU and DL CalRRU. The configurable buffer amount of the RRU is limited by the maximum compensation capacity of the RRU. In addition, if the downlink delay is selected to be adjusted on the RRU, the corresponding overall offset of the uplink-to-downlink and downlink-to-uplink timeslot switching points of the RRU is also considered.
Therefore, the scheme performs compensation on the basis of the original time delay measurement and compensation, and the adjustment of the downlink time delay can be performed on both the BBU and the RRU. An example of this implementation will now be described.
Fig. 5 is a flowchart of an example of a method for sending a synchronization signal, as shown in fig. 5, based on the foregoing scheme, the specific implementation manner of updating a time delay in the method for sending a synchronization signal provided by the present invention includes at least the following two types:
in a first implementation manner, the RRU determines whether a carrier has been established; and if the carrier is established on the RRU, refreshing a logic delay register value and an uplink and downlink time slot switching point register value according to the compensation delay to finish downlink delay adjustment.
In a first implementation manner, if no carrier is established on the RRU, the logical delay register value is refreshed according to the compensation delay in the process of waiting for the periodic delay configuration message of the BBU; and refreshing the register value of the uplink and downlink time slot switching point according to the compensation time delay in the process of establishing the carrier according to the carrier establishment command sent by the BBU, and finishing downlink time delay adjustment.
The specific process is as follows:
the BBU informs the RRU of the downlink delay adjustment amount (namely the compensation delay in the scheme) through a private message, after the RRU receives the downlink delay adjustment amount, the RRU judges whether the downlink delay adjustment amount exceeds the cache capacity of the RRU, if so, the RRU is informed of the failure of the compensation delay configuration, and if not, the RRU stores the downlink delay adjustment amount. And then judging whether the carrier is established on the RRU, if so, the RRU immediately refreshes a logic time delay register value, immediately refreshes a register value of an uplink and downlink time slot switching point, and finishes the adjustment of downlink time delay so that the base station can send the downlink synchronous signal according to the adjusted downlink time delay. If no carrier is established on the RRU, a BBU cycle time delay configuration message is waited, a time delay adjustment quantity is refreshed in the cycle time delay configuration process, a BBU issues a carrier establishment command to establish a carrier, and in the process of establishing the carrier, a numerical value in an uplink and downlink time slot switching point register is refreshed to complete downlink time delay adjustment, so that a base station can send the downlink synchronization signal according to the adjusted downlink time delay.
Fig. 6a is a schematic diagram of a downlink signal delay effect in the prior art; fig. 6b is a schematic diagram of a downlink signal delay effect of a base station according to the present invention; as shown in fig. 6a and 6b, comparing the effects before and after the synchronization signal transmission method is performed, for the terminal, the air interface delay, i.e. the distance, as can be seen from the above effect diagram, when the distance from the base station antenna to the terminal cannot be changed, in order to align the downlink signal at the terminal side, the delay buffer amount on the RRU can be actively adjusted to achieve the effect of changing the distance, and by newly adding a BBU/RRU downlink delay configuration interface and processing, under the premise of not changing the site, adopting a forced network optimization method and not upgrading the hardware capability of the existing terminal, the problem of handover failure is effectively solved by utilizing smaller resource cost (software upgrading only) to eliminate the possibly overlarge distance difference between the UE and the two eNBs of the main/adjacent areas, the invention can flexibly adjust the time delay parameter according to the actual situation, and has generalizability to the problems. The problem that the terminal equipment cannot detect the synchronous signal sent by the base station of the adjacent cell is avoided, so that the terminal can demodulate the downlink synchronous signal arriving at the adjacent cell, initiate measurement on the adjacent cell and complete cell switching
Fig. 7 is a schematic structural diagram of a base station according to a first embodiment of the present invention: as shown in fig. 7, the base station 10 includes:
a processing module 11, configured to obtain a downlink synchronization signal;
a transmission module 12, configured to send the downlink synchronization signal to a terminal device after a preconfigured compensation delay, so that the terminal device detects the downlink synchronization signal in a search window.
The base station provided in this embodiment is configured to implement the technical solution of the base station in any of the above embodiments, and the implementation principle and technical effect are similar, and the distance between the terminal and the base station is compensated by compensating the time delay, so that the distance difference between the neighboring cell base station and the main cell base station is eliminated without changing hardware, and the problem that the terminal device cannot detect the synchronization signal sent by the neighboring cell base station is avoided.
Fig. 8 is a schematic structural diagram of a second base station embodiment provided in the present invention: as shown in fig. 8, on the basis of the first embodiment, the processing module 11 includes a baseband processing unit BBU 111; the transmission module 12 includes a radio remote unit RRU 121, and the BBU 111 sends the pre-configured compensation delay to the RRU 121 after the pre-configured compensation delay and before the transmission module 12 sends the downlink synchronization signal to the terminal device.
Optionally, the RRU 121 determines whether the compensation delay exceeds a cache capacity of the RRU 121;
if not, the RRU 121 is further configured to buffer the compensation delay.
Optionally, the RRU 121 adjusts the downlink delay according to the compensation delay;
and the RRU 121 sends the downlink synchronization signal to the terminal device according to the adjusted downlink delay.
Optionally, the RRU 121 is specifically configured to:
judging whether a carrier wave is established;
if the RRU 121 has already established a carrier, the downlink delay adjustment is completed according to the compensation delay refreshing logic delay register value and the uplink and downlink timeslot switching point register value.
Optionally, the RRU 121 is further configured to:
if no carrier is established on the RRU 121, refreshing the logical delay register value according to the compensation delay in the process of waiting for the periodic delay configuration message of the BBU 111;
and refreshing the register value of the uplink and downlink time slot switching point according to the compensation time delay in the process of establishing the carrier according to the carrier establishment command sent by the BBU 111, and finishing downlink time delay adjustment.
The base station provided in this embodiment is configured to implement the technical solution of the base station in any of the above embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
In the specific implementation of the above embodiments, it should be understood that the processing module may be implemented as a processor, the processor may be integrated in the base station, or may be configured outside the base station to implement the processing function, the transmission module may be implemented by a receiver and/or a transmitter, etc., and the base station may further include a memory for storing program codes and data.
In the implementation of the base station, it should be understood that the Processor may be a Central Processing Unit (CPU), other general-purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for transmitting a synchronization signal, the method comprising:
a base station acquires a downlink synchronous signal;
after the base station is configured with the compensation time delay in advance, the base station sends the downlink synchronization signal to the terminal equipment, so that the terminal equipment detects the downlink synchronization signal in a search window; the base station is a neighbor cell base station of the terminal equipment; the base station comprises a base band processing unit (BBU) and a Radio Remote Unit (RRU);
wherein the method further comprises:
measuring the distance difference between the terminal equipment in the switching zone and the current service cell base station and the adjacent cell base station, and determining the compensation time delay according to the distance difference;
wherein, after the pre-configured compensation delay, before the base station sends the downlink synchronization signal to the terminal device, the method further includes:
the BBU sends the pre-configured compensation delay to the RRU;
after the pre-configured compensation delay, the base station sends the downlink synchronization signal to a terminal device:
the RRU adjusts downlink time delay according to the compensation time delay;
the RRU sends the downlink synchronous signal to the terminal equipment according to the adjusted downlink time delay;
wherein, the RRU adjusting the downlink delay according to the compensation delay comprises:
the RRU judges whether a carrier wave is established;
and if the carrier is established on the RRU, refreshing a logic delay register value and an uplink and downlink time slot switching point register value according to the compensation delay to finish downlink delay adjustment.
2. The method of claim 1, further comprising:
the RRU judges whether the compensation time delay exceeds the caching capacity of the RRU or not;
and if not, caching the compensation time delay by the RRU.
3. The method of claim 1, further comprising:
if no carrier is established on the RRU, refreshing the logic delay register value according to the compensation delay in the process of waiting for the periodic delay configuration message of the BBU;
and refreshing the register value of the uplink and downlink time slot switching point according to the compensation time delay in the process of establishing the carrier according to the carrier establishment command sent by the BBU, and finishing downlink time delay adjustment.
4. A base station, comprising:
the processing module is used for acquiring a downlink synchronous signal;
a transmission module, configured to send the downlink synchronization signal to a terminal device after a preconfigured compensation delay, so that the terminal device detects the downlink synchronization signal in a search window; the base station is a neighbor cell base station of the terminal equipment;
wherein the transmission module is further configured to:
measuring the distance difference between the terminal equipment in the switching zone and the current service cell base station and the adjacent cell base station, and determining the compensation time delay according to the distance difference;
the processing module comprises a baseband processing unit (BBU); if the transmission module comprises a Radio Remote Unit (RRU), after the pre-configured compensation delay, the transmission module sends the downlink synchronization signal to terminal equipment, and before the transmission module sends the pre-configured compensation delay to the RRU;
the RRU adjusts downlink time delay according to the compensation time delay;
the RRU sends the downlink synchronous signal to the terminal equipment according to the adjusted downlink time delay;
wherein the RRU is specifically configured to:
judging whether a carrier wave is established;
and if the carrier is established on the RRU, refreshing a logic delay register value and an uplink and downlink time slot switching point register value according to the compensation delay to finish downlink delay adjustment.
5. The base station of claim 4, wherein the RRU determines whether the compensation delay exceeds a buffering capability of the RRU;
and if not, the RRU is also used for caching the compensation time delay.
6. The base station of claim 4, wherein the RRU is further configured to:
if no carrier is established on the RRU, refreshing the logic delay register value according to the compensation delay in the process of waiting for the periodic delay configuration message of the BBU;
and refreshing the register value of the uplink and downlink time slot switching point according to the compensation time delay in the process of establishing the carrier according to the carrier establishment command sent by the BBU, and finishing downlink time delay adjustment.
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| CN110213797B (en) * | 2019-05-29 | 2022-05-10 | 鼎桥通信技术有限公司 | Air interface signal alignment processing method, device, equipment and storage medium |
| WO2021056295A1 (en) * | 2019-09-25 | 2021-04-01 | Oppo广东移动通信有限公司 | Time synchronization method and related device |
| CN113498114A (en) * | 2020-04-07 | 2021-10-12 | 富华科精密工业（深圳）有限公司 | Signal synchronization method and device based on 5G small base station sniffer channel |
| CN113543039B (en) * | 2020-04-22 | 2022-06-10 | 成都鼎桥通信技术有限公司 | Multicast signal sending method and device |
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