CN112654099A - LBT-based air interface interception method, device, system and medium - Google Patents
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Abstract
The embodiment of the disclosure relates to an LBT-based air interface interception method, device, system and medium, wherein when air interface interception is performed, the working mode of a distributed base station system is switched to an FDD mode, all subframes in an FDD frame structure are configured to work at an uplink moment, all subframes in the FDD frame structure are intercepted for uplink interference signals, and when the intensity of the uplink interference signals is not greater than a preset threshold value, the working mode of the distributed base station system is switched to a TDD mode, so that the distributed base station system provides service in the TDD mode. The embodiment of the disclosure can not only meet the requirement of the distributed base station system on the LBT function, but also ensure the normal service of the distributed base station system.
Description
Technical Field
The disclosed embodiments relate to the field of communications technologies, and in particular, to an LBT-based air interface listening method, apparatus, system, and medium.
Background
In the related art, a distributed base station system can introduce base station signals into each indoor area in a wired mode and transmit the base station signals through an indoor antenna to achieve the purpose of eliminating indoor signal coverage blind areas. Most of operators usually adopt a network planning method and a Global Positioning System (GPS) synchronization method to avoid signal interference, which is a good method, but brings huge network maintenance cost for the operators. And the method is only suitable for authorized networks with network planning conditions, and is not suitable for unauthorized networks without network planning conditions. As an important way to relieve the pressure of the licensed network, the application of the unlicensed network has become an important development direction, and therefore, in order to effectively use the unlicensed network and reduce the maintenance cost of the licensed network, how to implement a Listen Before Talk mechanism (Listen Before Talk, abbreviated as LBT) on the distributed TDD base station becomes a problem that needs to be solved at present by improving the communication quality through the Listen Before Talk mechanism.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, embodiments of the present disclosure provide an LBT-based air interface listening method, apparatus, system, and medium.
A first aspect of the present disclosure provides an LBT-based air interface listening method, which is applied to a distributed base station system, where the distributed base station system may be, for example, a distributed TDD base station system. The method comprises the following steps:
when air interface monitoring is carried out, the working mode of the distributed base station system is switched to a Frequency Division Duplex (FDD) mode, and all subframes in an FDD frame structure are configured to work at the uplink moment; monitoring uplink interference signals on all subframes in an FDD frame structure; judging whether the strength of the uplink interference signal is greater than a preset threshold value or not; and when the strength of the uplink interference signal is not greater than a preset threshold value, switching the working mode of the distributed base station system to a TDD mode so that the distributed base station system provides service in the TDD mode.
A second aspect of the present disclosure provides an air interface listening device, which is applied to a distributed base station system, where the base station system may be, for example, a distributed TDD base station system, and the air interface listening device includes:
and the first mode switching module is used for switching the working mode of the distributed base station system to the FDD mode when the air interface interception is carried out, and configuring all subframes in the FDD frame structure to work at the uplink moment.
And the monitoring module is used for monitoring the uplink interference signals on all subframes in the FDD frame structure.
And the first judging module is used for judging whether the strength of the uplink interference signal is greater than a preset threshold value.
And the second mode switching module is used for switching the working mode of the distributed base station system to a TDD mode when the strength of the uplink interference signal is not greater than the preset threshold value, so that the distributed base station system provides service in the TDD mode.
A third aspect of the embodiments of the present disclosure provides a baseband processing apparatus, including: a memory element and a processing element, wherein the memory element has stored therein a computer program which, when executed by the processing element, implements the method of the first aspect described above.
A fourth aspect of the embodiments of the present disclosure provides a distributed base station system, where the base station includes: a conversion Unit (CB for short), an extension Unit (SW for short), a Radio frequency Unit (Remote Radio Unit, RRU for short), and the baseband processing apparatus in the third aspect.
A fifth aspect of the embodiments of the present disclosure provides a computer storage medium, in which a computer program is stored, and when the computer program is executed by a processing element of a baseband processing apparatus, the method of the first aspect is implemented.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the working mode of the distributed base station system is switched to the FDD mode when air interface interception is performed, all subframes in the FDD frame structure are configured to work at the uplink moment, uplink interference signals are intercepted on all subframes in the FDD frame structure, and the working mode of the distributed base station system is switched to the TDD mode when the intensity of the uplink interference signals is not greater than a preset threshold value. The air interface interception scheme provided by the embodiment of the disclosure can be applied to a distributed TDD base station system, and solves the problem that the traditional LBT method can only be applied to an integrated small base station but not to a distributed base station system. Meanwhile, in the scheme provided by the embodiment of the disclosure, all subframes in the FDD frame structure are used for monitoring uplink interference, rather than part of subframes are used for uplink and part of subframes are used for downlink or special subframes as in the TDD frame structure, so that the problem of incomplete monitoring due to the existence of downlink subframes or special subframes is avoided, and a better monitoring effect is achieved. In addition, although the distributed base station system in the related art may also obtain the interference situation in a manner that the UE reports interference, at this time, data communication has actually started between the distributed base station system and the UE, and if the interference is large at this time, the reliability of the data communication is still affected.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a distributed TDD base station system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of an air interface listening method based on LBT according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a listening timing of a distributed base station system according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an LBT process provided by an embodiment of the present disclosure;
fig. 5 is a flowchart of an air interface listening method based on LBT according to an embodiment of the present disclosure
Fig. 6 is a flowchart of another LBT-based air interface listening method according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of an air interface listening device according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a baseband processing apparatus according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
With the rapid increase of data services, the data transmission pressure borne by the carrier of the authorized spectrum is also increasing, and therefore, sharing the data traffic in the authorized carrier by the carrier of the unlicensed spectrum becomes an important Evolution direction for the development of the subsequent Long Term Evolution (LTE). The unlicensed spectrum has the following advantages: the frequency spectrum resources are free or low in cost without purchase; individuals and enterprises can participate in deployment, and the admission requirement is low; the frequency bands including 5GHz, 2.4GHz and the like are included, and the available bandwidth is large; the method has the characteristic of resource sharing, and when a plurality of different systems operate in the system or different operators of the same system operate in the system, the utilization efficiency of the frequency spectrum can be improved in a resource sharing mode.
At present, when an unlicensed network is used, in order to ensure communication quality, a base station and a UE are generally required to execute an LBT mechanism when accessing an unlicensed spectrum, but most of current distributed TDD base stations do not support the LBT mechanism, which causes a barrier to the use of the distributed TDD base stations in the unlicensed network. In addition, in the authorized network, a network planning method is generally adopted to avoid signal interference, and the method is really good, but brings huge network maintenance cost for operators.
In view of the above problems in the related art, an embodiment of the present disclosure provides an LBT-based air interface listening scheme, which may be applied to a distributed TDD base station system, so that the distributed TDD base station system can also use an LBT mechanism, a use barrier of the distributed TDD base station system in an unlicensed network is broken, and high maintenance cost caused by using a network planning scheme is avoided.
Specifically, fig. 1 is a schematic structural diagram of a distributed TDD base station system according to an embodiment of the present disclosure, and as shown in fig. 1, the distributed TDD base station system according to this embodiment includes a baseband processing unit BBU, a conversion unit CB, an extension unit SW, and a plurality of radio frequency processing units RRU.
The radio frequency processing unit RRU is connected with the expansion unit SW through a network cable or an optical fiber. In the network cable connection mode, data interaction is performed between the radio frequency processing unit RRU and the expansion unit SW through an electrical interface (for example, an electrical interface with a 1G bandwidth). In the optical fiber connection mode, data interaction is performed between the radio frequency processing unit RRU and the extension unit SW through an optical interface (for example, an optical interface with a 10G bandwidth).
The expansion unit SW and the conversion unit CB are connected by an optical fiber, and a Common Public Radio Interface (CPRI) protocol is used for data interaction.
The conversion unit CB is connected to the baseband processing unit BBU through a network cable or an optical fiber, and in a network cable connection mode, data interaction is performed between the conversion unit CB and the baseband processing unit BBU through an electrical interface (for example, an electrical interface with a 1G bandwidth). In the optical fiber connection mode, data interaction is performed between the conversion unit CB and the baseband processing unit BBU through an optical interface (for example, an optical interface with a 10G bandwidth). And the data interaction between the conversion unit CB and the baseband processing unit BBU adopts an evolution protocol eCPRI of CPRI.
Referring to the distributed TDD base station system shown in fig. 1, an embodiment of the present disclosure provides an LBT-based air interface listening scheme, which may be applied to both an authorized network and an unauthorized network. Specifically, when the air interface is monitored, the working mode of the distributed base station system is seamlessly switched to the FDD mode, and all subframes in the FDD frame structure are configured to work at the uplink time, so that the distributed base station system monitors the uplink interference signal in the FDD mode. After LBT is completed, the working mode of the distributed base station system is switched back to the TDD mode, so that the LBT function of the distributed base station system is realized, the application limit of the distributed base station system in an unauthorized network is broken, and high maintenance cost caused by using a network planning scheme in an authorized network is avoided.
The technical solutions of the embodiments of the present disclosure are described in detail below with reference to exemplary embodiments.
Fig. 2 is a flowchart of an LBT-based air interface listening method according to an embodiment of the present disclosure, where the method may be applied to a distributed base station system to enable the distributed base station system to implement an LBT function, where the distributed base station system may be exemplarily understood as the distributed TDD base station system shown in fig. 1, and the system provides a service in a TDD mode. The method of this embodiment may be executed by a baseband processing apparatus, and the baseband processing apparatus may be embodied as a baseband processing unit BBU in the above-mentioned distributed base station system, or a part of functional modules in the baseband processing unit BBU. As shown in fig. 2, the method comprises the steps of:
And 204, when the strength of the uplink interference signal is not greater than a preset threshold, switching the working mode of the distributed base station system to a TDD mode, so that the distributed base station system provides service in the TDD mode.
For example, in this embodiment, the time for performing air interface listening is configured as two: one is started when the distributed base station system is powered on and initialized, and the other is started when the continuous running time of the distributed base station system in the TDD mode exceeds a first preset time.
For example, fig. 3 is a schematic view of a listening opportunity of a distributed base station system according to an embodiment of the present disclosure, in fig. 3, the distributed base station system performs a first LBT operation at power-on initialization, and a listening time length of the LBT operation is 300ms (in other implementations, the listening time length may also be configured as needed). If the intensity of the uplink interference signal is sensed to be less than the preset threshold, normal traffic service, such as transmission and reception of data, is performed in the next 24 hours (which may not be limited to 24 hours in other implementations). And when the time for continuously executing the service exceeds 24 hours, executing LBT operation again, and cycling the operation till the distributed base station system is powered off. That is to say, in an implementation manner of this embodiment, before performing air interface listening, a listening timing may be determined, and when it is determined that the listening timing is reached, for example, when the distributed base station system is in initial power-on or the continuous operation time in the TDD mode exceeds a first preset time, air interface listening is performed, and the operating mode of the distributed base station system is switched to the FDD mode. When the distributed base station system is judged to be in initial power-on, air interface monitoring can be directly started according to a preset initialization sequence, and the working mode of the distributed base station system is switched to an FDD mode; and when the distributed base station system is not in the initial power-on state, further judging whether the distributed base station system is in a TDD mode, if so, further judging whether the continuous operation time of the distributed base station system in the TDD mode exceeds a first preset time length, if so, performing air interface monitoring, switching the working mode of the distributed base station system to an FDD mode, and otherwise, not performing the air interface monitoring. It is to be understood that this is by way of illustration only and is not to be construed as the only limitation of the present disclosure.
It is worth mentioning that: although the embodiment provides only two air interface listening occasions, in other embodiments, the air interface listening occasions are not limited to these two occasions, but may be freely configured according to needs.
Further, in this embodiment, LBT sensing is performed on the uplink interference signal in the FDD mode. Specifically, when the listening operation is executed, the operating modes of the components (the baseband processing unit BBU, the conversion unit CB, the expansion unit SW, and the radio frequency processing unit RRU) of the distributed base station system are all switched to the FDD mode, all subframes in the FDD frame structure are configured to operate at the uplink time, and then the uplink interference signal is listened through all subframes in the FDD frame structure.
Specifically, fig. 4 is a schematic diagram of an LBT procedure provided by an embodiment of the present disclosure, as shown in fig. 4, when LBT sensing is started, an operation mode of a distributed base station system is switched to an FDD mode, and all subframes in an FDD radio frame are configured to operate at an uplink time, where a subframe operating at the uplink time in fig. 4 is denoted by "UL". The distributed base station system monitors signals on all subframes within the time length of 300ms, if the strength of the monitored surrounding interference signals is greater than a preset threshold value, the monitoring is continued, and the working mode of the distributed base station system is switched to a TDD mode until the strength of the monitored surrounding interference signals is not greater than the preset threshold value. In TDD mode, the distributed base station system will perform reception and transmission of data based on the TDD frame structure. The TDD frame structure shown in fig. 4 includes subframes operating at uplink time, special subframes, and subframes operating at downlink time. Here, the special subframe is denoted by "S", and the subframe operating at the downlink time is denoted by "DL". After entering the TDD mode, the distributed base station system provides service for a first preset time (for example, 24 hours) without performing LBT operation, and after the first preset time, the distributed base station system performs LBT operation again, and so on.
Referring to the FDD frame structure and TDD frame structure in fig. 4, the reason why the operation mode of the distributed base station system is switched to the FDD mode when performing LBT listening in this embodiment is as follows: in the standard protocol, there is a specification on the subframe type (subframe type includes a subframe operating at an uplink time, a subframe operating at a downlink time, and a special subframe) in the TDD frame structure, and there is no special specification on the subframe type in the FDD frame structure, so that all subframes in a radio frame can be set to operate at an uplink time by switching the operation mode to the FDD mode. If the working mode is not converted into the FDD mode, the TDD frame structure can be adopted, and the subframe of the middle work at the uplink time is monitored, but the signal interference situation of the subframe of the TDD frame structure at the downlink time and the special subframe cannot be detected and known, so the monitoring effect is poor.
Optionally, in order not to affect the normal service of the distributed base station system, in this embodiment, when the intensity of the uplink interference signal is detected to be greater than the preset threshold, the continuous working time of the distributed base station system in the FDD mode may be further determined, and when it is determined that the continuous working time of the distributed base station system in the FDD mode exceeds the second preset time duration, the working mode of the distributed base station system is switched to the TDD mode, so that the distributed base station system can provide a service in time; if the second preset time duration is not exceeded, the listening in the FDD mode may be continued. Of course, this is only an exemplary embodiment of this embodiment and is not the only embodiment of this disclosure.
In this embodiment, when performing air interface listening, the working mode of the distributed base station system is switched to the FDD mode, and all subframes in the FDD frame structure are configured to work at an uplink time, and the uplink interference signal is listened on all subframes in the FDD frame structure, and when the strength of the uplink interference signal is not greater than a preset threshold, the working mode of the distributed base station system is switched to the TDD mode, so that through seamless switching between the FDD mode and the TDD mode, the requirement of the distributed base station system on the LBT listening mode is met, and it is further ensured that the distributed base station system can provide normal service in the TDD mode. The air interface interception scheme provided by this embodiment may be applied to a distributed TDD base station system, and solves the problem that the conventional LBT method can only be applied to an integrated small base station system but not to a distributed base station system. Meanwhile, in the scheme provided by this embodiment, all subframes in the FDD frame structure are used for uplink interference monitoring, instead of part of subframes used for uplink and part of subframes used for downlink or special subframes as in the TDD frame structure, so that the problem of incomplete monitoring due to the existence of downlink subframes or special subframes is avoided, and a better monitoring effect is achieved. In addition, although the distributed base station system in the related art may also obtain the interference situation by using a method of reporting interference by the UE, at this time, data communication has actually started between the distributed base station system and the UE, and if the interference is large at this time, reliability of the data communication is still affected.
Fig. 5 is a flowchart of an LBT-based air interface listening method according to an embodiment of the present disclosure, where the method is applied to the distributed TDD base station system shown in fig. 1 in this embodiment. As shown in fig. 5, the method includes:
step 501, when the air interface interception is performed, the BBU sends a first notification message to the CB.
The first notification message is used for instructing the CB to stop sending the interrupt message, and the interrupt message is used for controlling the sending and receiving time of the data.
Step 502, after receiving the first notification message, the CB first closes the uplink and downlink baseband data of the RRU, and then sends a feedback message of the stopped interrupt message to the BBU. At the moment, the BBU stops calling the interrupt message of the CB, the whole distributed TDD base station system is in a silent state, and does not receive uplink baseband data and send downlink baseband data; only push of commands can be done.
Step 503, the BBU switches the operating mode to the FDD mode, and sends a mode switching command to the CB, and simultaneously configures all subframes (for example, all 10 subframes in a 10ms frame structure) in the FDD frame structure to operate at the uplink time. After receiving the mode switching command, the CB switches the working mode of the CB to an FDD mode, sends the mode switching command to the RRU so that the RRU also switches the working mode to the FDD mode, and configures all subframes to work at the uplink time; and after the CB and the RRU execute the working mode switching and the subframe configuration, the CB sends a success response message to the BBU.
And step 504, after receiving the successful response message, the BBU sends a second notification message to the CB, so that the CB resumes sending the interrupt message, starts uplink and downlink baseband data of the RRU, and releases the silent state of the distributed TDD base station system. And after the CB resumes sending the interrupt message, sending a response message for resuming the interrupt message to the BBU.
And step 505, the BBU periodically calls an interrupt message.
Step 506, the BBU periodically starts to receive the data of the uplink signal (i.e. listens for the uplink interference signal).
And 507, when the intensity of the uplink interference is not greater than the preset threshold value, the BBU sends a third notification message to the CB, wherein the third notification message is used for indicating the CB to suspend sending the interrupt message.
Step 508, after receiving the third notification message, the CB first closes the uplink and downlink baseband data of the RRU, and then sends a feedback message of the stop interrupt message to the BBU. At this time, the BBU stops calling the interrupt message, the whole distributed TDD base station system is in a 'silent' state, and does not receive uplink baseband data and send downlink baseband data; only push of commands can be done.
Step 509, the BBU switches the working mode to the TDD mode, and sends a mode switching command to the CB, and configures the radio frame as a TDD frame. After receiving the mode switching command, the CB switches the working mode of the CB to a TDD mode, and sends a mode switching command to the RRU to enable the RRU to switch the working mode to the TDD mode, and wireless frames are configured to be TDD frames; and after the CB and the RRU complete the working mode switching and the frame configuration, the CB sends a successful response message to the BBU.
And step 510, the BBU sends a fourth notification message to the CB, so that the CB resumes sending the interrupt message, opens uplink and downlink baseband data of the RRU, and releases the silent state of the distributed TDD base station system. And after the CB resumes sending the interrupt message, sending a response message for resuming the interrupt message to the BBU.
Step 511, the BBU periodically calls the interrupt message, and the distributed TDD base station system executes the normal service.
In this embodiment, before switching the working mode, the CB is notified to stop sending the interrupt message, so that the distributed TDD base station system is in a silent state during the working mode switching, and the sending of the interrupt message is resumed after the mode switching is completed, thereby avoiding a data exception problem caused by inconsistent working mode switching time of each unit in the distributed base station system.
Fig. 6 is a flowchart of another LBT-based air interface listening method according to an embodiment of the present disclosure, where the method may be applied to the distributed TDD base station system shown in fig. 1, where a baseband processing unit BBU of the base station system includes: a physical unit (BBU PHY), a management unit (BBU OAM), and a drive unit (BBU DRV). As shown in fig. 6, the method includes:
step 1: starting the BBU, starting the operation of the BBU PHY, and sending the initialization TDD message to the BBU DRV; the BBU OAM starts to operate, and meanwhile, a TDD mode is initialized to the CB and the RRU.
Step 2: and connection is established between the BBU PHY and the BBU OAM.
And step 3: the CB periodically (e.g., 1ms) sends an interrupt message to the BBU DRV, where the interrupt message is used to control the transceiving Time of data, and the interrupt message may be understood as a Transmission Time Interval (TTI) message by way of example in this embodiment. After receiving the TTI message, the BBU DRV forwards the TTI message to the BBU PHY, so that the BBU PHY receives uplink data and transmits downlink data according to the TTI message.
And 4, step 4: and starting the LBT operation, and sending a notice (hereinafter referred to as a first notice message) for suspending the transmission of the TTI message to the BBU OAM by the BBU PHY, so that the BBU OAM forwards the first notice message to the CB. The method aims to stop the service of the distributed TDD base station system during the switching of the working mode and avoid the problem of data abnormity caused by inconsistent working mode switching time between the BBU PHY and the BBU OAM.
And 5: and after receiving the first notification message, the CB firstly closes the uplink and downlink baseband data of the RRU, then sends a feedback message of the stopped TTI message to the BBU OAM, and the BBU OAM forwards the feedback message to the BBU PHY. At the moment, the BBU PHY stops calling the TTI message, the whole distributed TDD base station system is in a silent state, and does not receive uplink baseband data and send downlink baseband data; only push of commands can be done.
Step 6: and the BBU PHY switches the working mode to the FDD mode, sends a mode switching command to the BBU OAM and the BBU DRV and instructs the BBU OAM and the BBU DRV to switch the working mode to the FDD mode. And sending a mode switching command to the CB by the BBU OAM, and simultaneously configuring all subframes (10 subframes) in the FDD frame structure to work at the uplink time. After receiving the mode switching command, the CB switches the working mode of the CB to an FDD mode, sends the mode switching command to the RRU so that the RRU also switches the working mode to the FDD mode, and configures all subframes to work at the uplink time; and after the CB and the RRU execute the working mode switching and the subframe configuration, the CB sends a success response message to the BBU OAM.
And 7: and after receiving the successful response message, the BBU OAM sends a second notification message to the CB so that the CB can resume sending the TTI message, and starts uplink and downlink baseband data of the RRU to release the silent state of the distributed TDD base station system. And after the CB resumes sending the TTI message, sending a response message of the TTI message to the BBU OAM so that the BBU OAM sends the response message to the BBU PHY.
And 8: the BBU PHY periodically invokes the TTI message.
And step 9: the BBU PHY periodically switches on receiving data of the uplink signal (i.e., listens for uplink interference signals).
Step 10: when the intensity of the uplink interference is monitored to be smaller than or equal to the preset threshold, the BBU PHY sends a notification (hereinafter referred to as a third notification message) for suspending sending the TTI message to the BBU OAM, so that the BBU OAM forwards the third notification message to the CB.
Step 11: and after receiving the third notification message, the CB firstly closes the uplink and downlink baseband data of the RRU, then sends a feedback message of the stopped TTI message to the BBU OAM, and the BBU OAM forwards the feedback message to the BBU PHY. At the moment, the BBU PHY stops calling the TTI message, the whole distributed TDD base station system is in a silent state, and does not receive uplink baseband data and send downlink baseband data; only push of commands can be done.
Step 12: and the BBU PHY switches the working mode to the TDD mode, and sends a mode switching command to the BBU OAM and the BBU DRV to instruct the BBU OAM and the BBU DRV to switch the working mode to the TDD mode. And sending a mode switching command to the CB by the BBU OAM, and configuring the wireless frame into a TDD frame. After receiving the mode switching command, the CB switches the working mode of the CB to a TDD mode, and sends a mode switching command to the RRU to enable the RRU to switch the working mode to the TDD mode, and wireless frames are configured to be TDD frames; and after the CB and the RRU complete the working mode switching and the frame configuration, the CB sends a successful response message to the BBU OAM.
Step 13: and the BBU OAM sends a fourth notification message to the CB to enable the CB to recover sending the TTI message, and starts uplink and downlink baseband data of the RRU to release the silent state of the distributed TDD base station system. And after the CB resumes sending the TTI message, sending a response message of the TTI message to the BBU OAM so that the BBU OAM sends the response message to the BBU PHY.
Step 14: the BBU PHY periodically calls the TTI message, and the distributed TDD base station system executes normal service.
The method of this embodiment may be performed after the distributed TDD base station system is powered on and initialized.
When the continuous working time of the distributed TDD base station system in the TDD mode exceeds the preset duration, the method for performing the LBT operation is similar to that of this embodiment, and is not described herein again.
In this embodiment, before switching the working mode, the CB is notified to stop sending the TTI message, so that the distributed TDD base station system is in a silent state during the switching of the working mode, and the transmission of the TTI message is resumed after the completion of the mode switching, thereby avoiding a data abnormality problem caused by inconsistency in the working mode switching time between the BBU PHY and the BBU OAM.
Fig. 7 is a schematic structural diagram of an air interface listening device according to an embodiment of the present disclosure, and specifically, the air interface listening device may be embodied as a baseband processing device or a part of functional modules in the baseband processing device in the foregoing embodiment. As shown in fig. 7, the apparatus 70 includes:
the first mode switching module 71 is configured to switch the operating mode of the distributed base station system to a frequency division duplex mode when performing air interface listening, and configure all subframes in a frame structure of frequency division duplex to operate at an uplink time.
A listening module 72, configured to listen to the uplink interference signal on all subframes in the frame structure.
The first determining module 73 is configured to determine whether the strength of the uplink interference signal is greater than a preset threshold.
A second mode switching module 74, configured to switch a working mode of the distributed base station system to a time division duplex mode when the strength of the uplink interference signal is not greater than the preset threshold, so that the distributed base station system provides a service in the time division duplex mode.
In one embodiment, the apparatus further comprises:
and the second judgment module is used for judging whether to carry out air interface interception before carrying out the air interface interception.
The first mode switching module is configured to switch the operating mode of the distributed base station system to a frequency division duplex mode when the second determining module determines to perform air interface listening.
In an embodiment, the second determining module is configured to:
judging whether the distributed base station system is in initial power-on, if so, judging to carry out air interface interception; or judging whether the continuous running time of the distributed base station system in the time division duplex mode exceeds a first preset time length, and if so, judging to carry out air interface interception.
In an embodiment, the second determining module is further configured to:
when the distributed base station system is judged not to be in the initial power-on state, judging whether the distributed base station system is in a time division duplex mode or not; and if the distributed base station system is in a time division duplex mode, judging whether the continuous operation time of the distributed base station system in the time division duplex mode exceeds the first preset time length, and if so, judging to perform air interface interception.
In one embodiment, the apparatus further comprises:
a third judging module, configured to judge whether a continuous operating time of the distributed base station system in the frequency division duplex mode exceeds a second preset time duration when the strength of the uplink interference signal is greater than the preset threshold; if yes, the second mode switching module switches the working mode of the distributed base station system to a time division duplex mode.
In one embodiment, the distributed base station system comprises a baseband processing unit, a conversion unit, an extension unit and a radio frequency processing unit.
The first mode switching module 71 includes:
a first sending unit, configured to send a first notification message to the conversion unit, so that the conversion unit stops sending the interrupt message, and closes the uplink and downlink baseband data of the radio frequency processing unit, so that the distributed base station system stops providing the service.
And the first switching unit is used for switching the working modes of the baseband processing unit, the conversion unit and the radio frequency processing unit into a frequency division duplex mode after receiving the feedback that the conversion unit stops sending the interrupt message.
In one embodiment, the first mode switching module 71 further comprises:
and the second sending unit is used for sending a second notification message to the conversion unit so as to enable the conversion unit to resume sending the interrupt message and start uplink and downlink baseband data of the radio frequency processing unit.
In one embodiment, the second mode switching module 74 includes:
a third sending unit, configured to send a third notification message to the conversion unit, so that the conversion unit stops sending the interrupt message, and closes the uplink and downlink baseband data of the radio frequency processing unit, so that the distributed base station system stops providing the service;
and the second switching unit is used for switching the working modes of the baseband processing unit, the conversion unit and the radio frequency processing unit into a time division duplex mode after receiving the feedback that the conversion unit stops sending the interrupt message.
The apparatus provided in this embodiment is capable of performing the method of any one of the embodiments in fig. 2 to fig. 6, and the performing manner and the beneficial effects thereof are similar and will not be described again here.
Fig. 8 is a schematic structural diagram of a baseband processing apparatus provided in an embodiment of the present disclosure, where the baseband processing apparatus may be understood as a baseband processing apparatus in the foregoing embodiment, as shown in fig. 8, a baseband processing apparatus 80 includes a storage element 81 and a processing element 82, where the storage element 81 stores a computer program, and when the computer program is executed by the processing element 82, the method in any one of the foregoing embodiments in fig. 2 to fig. 6 may be implemented, and the execution manner and the beneficial effects thereof are similar and will not be repeated here.
The embodiment of the present disclosure further provides a distributed base station system, where the base station system includes a switching unit CB, an extension unit SW, a radio frequency processing unit RRU, and a baseband processing apparatus as in any of the above embodiments.
The embodiments of the present disclosure further provide a computer storage medium, where a computer program is stored in the storage medium, and when the computer program is executed by a processing element of the baseband processing apparatus, the method of any one of the embodiments in fig. 2 to fig. 6 may be implemented, and the execution manner and the beneficial effects thereof are similar and will not be repeated herein.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. An air interface interception method based on LBT is characterized in that the communication method is applied to a distributed base station system and comprises the following steps:
when air interface monitoring is carried out, the working mode of the distributed base station system is switched to a frequency division duplex mode, and all subframes in a frame structure of the frequency division duplex mode are configured to work at the uplink moment;
monitoring uplink interference signals on all subframes in the frame structure;
judging whether the strength of the uplink interference signal is greater than a preset threshold value;
and when the strength of the uplink interference signal is not greater than the preset threshold, switching the working mode of the distributed base station system to a time division duplex mode so that the distributed base station system provides service in the time division duplex mode.
2. The method of claim 1, further comprising:
before air interface interception is carried out, judging whether the air interface interception is carried out or not;
and if so, executing the step of switching the working mode of the distributed base station system to a frequency division duplex mode.
3. The method according to claim 2, wherein the determining whether to perform the air interface listening comprises:
judging whether the distributed base station system is in initial power-on, if so, carrying out air interface monitoring; or
And judging whether the continuous running time of the distributed base station system in the time division duplex mode exceeds a first preset time length, if so, carrying out air interface interception.
4. The method of claim 3, further comprising:
if the distributed base station system is not in the initial power-on state, judging whether the distributed base station system is in a time division duplex mode;
and if the distributed base station system is in a time division duplex mode, judging whether the continuous operation time of the distributed base station system in the time division duplex mode exceeds the first preset time length, and if so, carrying out air interface interception.
5. The method of claim 1, further comprising:
when the strength of the uplink interference signal is greater than the preset threshold, judging whether the continuous working time of the distributed base station system in the frequency division duplex mode exceeds a second preset time length;
and if so, switching the working mode of the distributed base station system to a time division duplex mode.
6. The method of claim 1, wherein the distributed base station system comprises a baseband processing unit, a conversion unit, an extension unit, and a radio frequency processing unit;
the switching the operating mode of the distributed base station system to the frequency division duplex mode includes:
sending a first notification message to the conversion unit to enable the conversion unit to stop sending the interrupt message, and closing uplink and downlink baseband data of the radio frequency processing unit, so that the distributed base station system stops providing service;
and after receiving the feedback that the conversion unit stops sending the interrupt message, switching the working modes of the baseband processing unit, the conversion unit and the radio frequency processing unit into a frequency division duplex mode.
7. The method of claim 6, wherein after switching the operation mode of the distributed base station system to the frequency division duplex mode and configuring all subframes in a frame structure of frequency division duplex to operate at uplink time, the method further comprises:
and sending a second notification message to the conversion unit so that the conversion unit resumes sending the interrupt message and starts uplink and downlink baseband data of the radio frequency processing unit.
8. The method of claim 6, wherein switching the operation mode of the distributed base station system to the time division duplex mode comprises:
sending a third notification message to the conversion unit to enable the conversion unit to stop sending the interrupt message, and closing the uplink and downlink baseband data of the radio frequency processing unit, so that the distributed base station system stops providing service;
and after receiving the feedback that the conversion unit stops sending the interrupt message, switching the working modes of the baseband processing unit, the conversion unit and the radio frequency processing unit into a time division duplex mode.
9. An air interface interception apparatus, wherein the apparatus is applied to a distributed base station system, and the apparatus comprises:
the first mode switching module is used for switching the working mode of the distributed base station system into a frequency division duplex mode when air interface interception is carried out, and configuring all subframes in a frame structure of the frequency division duplex to work at an uplink moment;
the monitoring module is used for monitoring uplink interference signals on all subframes in the frame structure;
the first judgment module is used for judging whether the strength of the uplink interference signal is greater than a preset threshold value;
and the second mode switching module is configured to switch the working mode of the distributed base station system to a time division duplex mode when the strength of the uplink interference signal is not greater than the preset threshold, so that the distributed base station system provides a service in the time division duplex mode.
10. A baseband processing apparatus comprising a memory element and a processing element, wherein the memory element has stored therein a computer program which, when executed by the processing element, implements the method according to any one of claims 1-8.
11. A distributed base station system comprising a conversion unit, an extension unit and a radio frequency processing unit, and a baseband processing apparatus according to claim 10.
12. A computer storage medium, characterized in that the storage medium has stored therein a computer program which, when executed by a processing element in a baseband processing apparatus, carries out the method according to any one of claims 1-8.
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| CN107079498A (en) * | 2014-11-17 | 2017-08-18 | 英特尔Ip公司 | Uplink grant auxiliary access in unauthorized frequency range（LAA）First listening for operation is said afterwards（LBT）Design |
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