CN111786753A - Reference signal measurement method and device - Google Patents
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Abstract
The embodiment of the invention provides a reference signal measuring method and device. The method comprises the following steps: in the process of periodically sending the reference signal to the terminal, if the LBT execution fails, the reference signal is discarded; and after the LBT is successfully executed, sending a reference signal to the terminal at the moment, and simultaneously sending a PDCCH to the terminal, wherein the DCI on the PDCCH carries the number of the reference signals which are not sent due to the LBT execution failure before the moment of sending. The base station informs the terminal of the number of the reference signals which are not sent due to the LBT execution failure, so that the terminal judges whether the reference signal sampling value obtained by the terminal is too low because the base station does not send the reference signals or because the channel condition is poor, and finally obtains an accurate reference signal measurement result, the terminal can be prevented from mistakenly triggering a measurement report under the better channel condition, the improper triggering of switching is avoided, the call drop probability caused by the improper triggering is reduced, and the user service experience is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for measuring a reference signal.
Background
The 5G cells need to periodically send Reference Signal SSB (SS/PBCH Block, Synchronization Signal/Physical Broadcast Channel Block, Synchronization Signal Block), each 5G terminal needs to continuously measure RSRP (Reference Signal Received Power)/RSRQ (Reference Signal Received Quality) of the Reference Signal sent by the cell, and according to the measurement result, the connected terminal determines whether to trigger a measurement report, so that the network can switch the terminal to a cell with better Signal.
When the terminal calculates the reference signal measurement result RSRP/RSRQ, layer three filtering is carried out on the basis of the measurement sampling value provided by the physical layer, so that the situation that the measurement result is inaccurate due to severe jitter of the measurement sampling is avoided. The layer three filtering is that the terminal high layer performs weighted average on the latest measurement sampling value provided by the physical layer and the measurement result obtained after the previous filtering to obtain the latest measurement result. When the current service cell RSRP/RSRQ value measured by the terminal is lower than the RSRP/RSRQ value of the adjacent cell by a certain amount, triggering measurement report, and triggering switching by the network according to the measurement result reported by the terminal to order the terminal to be accessed to the specified adjacent cell to continue the service.
In the current 5G technical research, a 5G network may be deployed on an unlicensed spectrum, and a 5G cell operating in the unlicensed spectrum may be an independent cell, that is, similar to a cell operating in a licensed spectrum, and may independently send a system broadcast message, and independently accept access of a UE, so as to transmit uplink and downlink data for the UE. Since the channel is shared, in order to ensure fair coexistence with the WiFi system, the 5G base station and the terminal operating in the unlicensed spectrum must perform LBT (Listen Before Talk) operation Before transmitting data, where the LBT 'Listen Before Talk' means that when a wireless device (including the base station and the UE) operating in the unlicensed spectrum prepares to transmit data, it first monitors the wireless channel condition, and only when detecting that the wireless channel is idle, it can occupy the channel to transmit data, and if the channel is busy, it cannot use the wireless channel, and needs to wait for the next transmission opportunity.
Based on the prior art scheme, when the 5G cell works in the unlicensed spectrum, an LBT operation is performed before sending the reference signal, and if the LBT fails (i.e., the channel is busy and there may be other devices transmitting), the sending of the reference signal is discarded, and a next sending opportunity is waited. If the terminal physical layer just carries out reference signal sampling at the moment, the obtained sampling value is very low, so that the measurement result obtained by the high layer based on the filtering of the sampling value has serious deviation. Because two situations, namely reference signal loss and signal strength/quality difference, caused by LBT failure cannot be distinguished, a terminal may report a measurement report incorrectly under the condition that a serving cell signal is good, and handover is not properly triggered, and at this time, a neighbor cell signal is not good enough, so that the terminal cannot be successfully accessed to a neighbor cell, and a call drop occurs, which affects user experience.
Disclosure of Invention
In order to solve the problems in the prior art, embodiments of the present invention provide a method and an apparatus for measuring a reference signal.
The embodiment of the invention provides a reference signal measuring method, which is applied to a 5G base station working in an unauthorized frequency spectrum, and comprises the following steps:
in the process of periodically sending the reference signal to the terminal, if the LBT execution fails, the reference signal is discarded;
and after the LBT is successfully executed, sending a reference signal to the terminal at the moment, and simultaneously sending a PDCCH to the terminal, wherein the DCI on the PDCCH carries the number of the reference signals which are not sent due to the LBT execution failure before the moment of sending.
The embodiment of the invention provides a reference signal measuring method, which is applied to a terminal and comprises the following steps:
in the process of receiving a reference signal periodically transmitted by a base station, when a measured value of the received reference signal is lower than a specified threshold value, monitoring a PDCCH in a specified monitoring window, wherein the DCI on the PDCCH carries the number of the reference signals which are not transmitted due to LBT execution failure before the current transmission moment;
if the PDCCH is received in the appointed monitoring window, judging whether the measured value of the reference signal received before is lower than an appointed threshold value or not because the reference signal is not sent due to LBT execution failure according to the number of the reference signal which is carried by the DCI on the PDCCH and is not sent before the current sending time due to LBT execution failure;
and if the LBT is caused by failure in LBT execution and no reference signal is sent, performing layer three filtering based on the measured value of the newly received reference signal to obtain a measured result.
The embodiment of the invention provides a reference signal measuring device, which is applied to a 5G base station working in an unauthorized frequency spectrum, and comprises the following components:
a discarding unit, configured to discard the reference signal if LBT execution fails in a process of periodically sending the reference signal to the terminal;
and a sending unit, configured to send, to the terminal, a PDCCH at a time when the LBT is successfully executed, where the DCI on the PDCCH carries the number of reference signals that have not been sent due to the LBT execution failure before the time of the current sending.
The embodiment of the invention provides a reference signal measuring device, which is applied to a terminal and comprises:
a monitoring unit, configured to monitor a PDCCH in a specified monitoring window when a received reference signal measurement value is lower than a specified threshold in a process of receiving a reference signal periodically transmitted by a base station, where DCI on the PDCCH carries a number of reference signals that have not been transmitted due to LBT execution failure before a current transmission time;
a determining unit, configured to determine, if the PDCCH is received in the designated monitoring window, whether a measurement value of a previously received reference signal is lower than a designated threshold value due to an LBT execution failure and no reference signal transmission according to the number of reference signals that are not transmitted due to an LBT execution failure before the current transmission time and are carried by the DCI on the PDCCH;
and the measurement unit is used for performing layer three filtering based on the measurement value of the reference signal which is received latest if the LBT execution fails and the reference signal is not transmitted, so as to obtain a measurement result.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the reference signal measurement method.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the above-mentioned reference signal measurement method.
According to the reference signal measurement method and device provided by the embodiment of the invention, the base station informs the terminal of the number of the reference signals which are not sent due to the LBT execution failure, so that the terminal judges whether the reference signal sampling value obtained by the terminal is too low because the base station does not send the reference signals or because the channel condition is poor, and finally obtains an accurate reference signal measurement result, the terminal can be prevented from mistakenly triggering a measurement report under a better channel condition, the improper triggering of switching is avoided, the call drop probability caused by the improper triggering is reduced, and the user service experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a reference signal measurement method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a base station sending a PDCCH indicating reference signal discard and a terminal monitoring the PDCCH according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a reference signal measurement method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a reference signal measurement apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a reference signal measurement apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device 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 shows a flowchart of a reference signal measurement method provided by an embodiment of the present invention, where the method is applied to a 5G base station operating in an unlicensed spectrum.
As shown in fig. 1, the method for measuring a reference signal provided in the embodiment of the present invention specifically includes the following steps:
s11, in the process of sending the reference signal to the terminal periodically, if the LBT execution fails, the reference signal is discarded;
specifically, when the 5G cell operates in the unlicensed spectrum, an LBT operation is performed before the reference signal is transmitted, and if the LBT fails (i.e., the channel is busy and there may be other devices transmitting), the current reference signal transmission is discarded and the next transmission opportunity is waited.
And S12, after the LBT is successfully executed, sending the reference signals to the terminal at the moment, and simultaneously sending the PDCCH to the terminal, wherein the DCI on the PDCCH carries the number of the reference signals which are not sent due to the LBT execution failure before the moment of sending.
Fig. 2 shows a diagram of a base station transmitting a PDCCH indicating reference signal discard.
As shown in fig. 2, a 5G base station periodically transmits a reference signal, if a reference signal is discarded due to LBT failure at a certain transmission time, at a next successful transmission time of LBT, the base station transmits a PDCCH (physical Downlink Control channel) PDCCH in a common search space, where the PDCCH carries DCI (Downlink Control information) that indicates that N consecutive reference signals are not transmitted before the current time.
It should be noted that the DCI information may be, but is not limited to, an existing DCI format 1_0 in a 5G system, or a newly defined DCI format, where the DCI format includes a field indicating that N consecutive reference signals are not transmitted before the current transmission time.
The reference signal measuring method provided by the embodiment of the invention is applied to a 5G base station working in an unlicensed frequency spectrum, when a 5G cell works in the unlicensed frequency spectrum, if the reference signal is discarded due to LBT failure, the base station can inform a terminal of the number of the reference signals which are not sent due to LBT execution failure by sending DCI, so that the terminal can judge whether the reference signal sampling value obtained by the terminal is too low because the base station does not send the reference signal or because the channel condition is poor, and finally obtain an accurate reference signal measuring result.
On the basis of the foregoing embodiment, the sending the PDCCH to the terminal includes:
and sending a PDCCH in the common search space, wherein the PDCCH is scrambled by using a new wireless network temporary identifier.
Specifically, the base station transmits a PDCCH in the common search space, and the PDCCH is scrambled using a new Radio Network Temporary Identity (Radio Network Temporary Identity).
The DCI may be, but is not limited to, DCI format 1_0 existing in the 5G system, or may be a new format, where CRC is scrambled using a new Identity RM-RNTI (Radio Measurement-Radio Network Temporary Identity), and the DCI includes a Number of RS dropped field, where the length of the field may be, but is not limited to, 8 bits, and this information indicates how many consecutive reference signals are dropped before the current DCI receiving time. The other bits are reserved.
Fig. 3 is a flowchart illustrating a method for measuring a reference signal according to an embodiment of the present invention, where the method is applied to a terminal.
As shown in fig. 3, the method for measuring a reference signal provided in the embodiment of the present invention specifically includes the following steps:
s21, in the process of receiving the reference signals periodically transmitted by the base station, when the measured value of the received reference signals is lower than a specified threshold, monitoring a PDCCH in a specified monitoring window, wherein the DCI on the PDCCH carries the number of the reference signals which are not transmitted due to LBT execution failure before the current transmission moment;
wherein the reference signal measurement value may be a reference signal received power, RSRP, and/or a reference signal received quality, RSRQ.
Fig. 2 shows a schematic diagram of a terminal monitoring a PDCCH.
Specifically, the terminal receives a decoded reference signal, and when a reference signal measurement value obtained by the physical layer is lower than a preset threshold, a monitoring window PDCCH is started. The DCI on the PDCCH carries special indication information which indicates that continuous N reference signals are not sent before the current time.
It should be noted that the DCI information may be, but is not limited to, an existing DCI format 1_0 in a 5G system, or a newly defined DCI format, where the DCI format includes a field indicating that N consecutive reference signals are not transmitted before the current transmission time.
S22, if the PDCCH is received in the designated monitoring window, determining whether the measurement value of the reference signal received before is lower than a designated threshold value due to the reference signal not being transmitted due to the LBT execution failure according to the number of the reference signals not being transmitted due to the LBT execution failure before the current transmission time carried by the DCI on the PDCCH;
specifically, if the PDCCH is received in the monitoring window while receiving the reference signal, it is determined whether a previously obtained reference signal measurement value is lower than a threshold value due to the reference signal being discarded, based on DCI information on the PDCCH.
And S23, if the LBT execution fails and the reference signal is not sent, performing layer three filtering based on the measured value of the reference signal received latest to obtain the measuring result.
Specifically, if the LBT fails to perform and the reference signal is not transmitted, the terminal physical layer delivers the latest obtained reference signal measurement value to the higher layer, and instructs the higher layer to perform layer three filtering by replacing the previous measurement value with the new measurement value, so that an accurate reference signal measurement result is obtained after filtering.
The reference signal measuring method provided by the embodiment of the invention is applied to a terminal, when a reference signal measured value received by the terminal is lower than a threshold value, a monitoring window is started, when DCI carrying indication information is monitored, whether the previous reference signal measured value is lower than the threshold value is caused by that the reference signal is not sent is judged, if yes, a high layer excludes the previous measuring sampling value when filtering is carried out, and finally an accurate reference signal measuring result is obtained. The method and the device can prevent the terminal from triggering the measurement report wrongly under the better channel condition, avoid improper triggering of switching, reduce the call drop probability caused by improper triggering, and improve the user service experience.
On the basis of the foregoing embodiment, S21 specifically includes:
and monitoring the PDCCH in a public search space, wherein the PDCCH uses a new wireless network temporary identifier for scrambling.
Specifically, the terminal monitors the PDCCH in a common search space, and the PDCCH is scrambled using a new Radio Network Temporary Identity (Radio Network Temporary Identity).
The DCI may be, but is not limited to, DCI format 1_0 existing in the 5G system, or may be a new format, where the CRC is scrambled using a new Identity RM-RNTI (Radio Measurement-Radio Network Temporary Identity), and the DCI includes a Number of RS dropped field, where the field length may be, but is not limited to, 8 bits, and this information indicates how many consecutive reference signals are dropped before the current DCI receiving time. The other bits are reserved.
On the basis of the foregoing embodiment, S23 specifically includes:
and the terminal physical layer submits the latest received reference signal measurement value to a high layer and indicates the high layer to replace the previous measurement value with the latest measurement value to execute layer three filtering, so that an accurate reference signal measurement result is obtained after filtering.
Specifically, if the terminal determines that the previous reference signal measurement value is lower than the threshold value based on the DCI information because the reference signal is not transmitted, the terminal physical layer submits an indication message and the latest obtained reference signal measurement value to the higher layer, and after receiving the indication message, the terminal higher layer performs layer three filtering by using the latest reference signal measurement value instead of the previous measurement value, so as to obtain a measurement result.
On the basis of the above embodiment, the method further includes:
and when the appointed monitoring window is finished, the PDCCH is not monitored any more.
Specifically, when the monitoring window ends, the terminal does not monitor the PDCCH any more.
The following describes embodiments of the present invention in detail by way of examples in a specific context.
Scenario one, cell 1 of the 5G base station operates in unlicensed spectrum, periodically transmits a reference signal SSB with a period of 5ms, and terminal UE1 is connected to cell 1 with better channel conditions.
1) The base station does not successfully send the reference signal of the cell 1 due to LBT failure at time t1, at this time, the UE1 tries to receive the reference signal and measure RSRP/RSRQ, the obtained RSRP/RSRQ value is lower than a preset threshold Th, the UE1 physical layer submits the RSRP/RSRQ measurement value to a higher layer, because the UE1 cannot judge whether the RSRP/RSRQ measurement value is caused by poor channel conditions or due to LBT failure of the base station, the UE1 starts a monitoring window, and the window duration is 20 ms;
2) at time t2(t2 ═ t1+5ms), the base station still fails to perform LBT, and thus does not send a reference signal,
3) at time t3(t3 ═ t1+10ms), the base station performs LBT success, the cell 1 reference signal is successfully transmitted, while the base station transmits PDCCH scrambled with RM-RNTI, carrying DCI information thereon, indicating that 2 consecutive reference signals were discarded before this time due to LBT failure;
4) UE1 receives the RM-RNTI scrambled PDCCH at t3, receives the reference signals and measures to get a new RSRP/RSRQ value (which is higher than the preset threshold Th), and based on the DCI information on the received PDCCH, UE1 knows that 2 reference signals were dropped before t3, including the reference signal at time t1, so UE1 delivers the latest RSRP/RSRQ measurement value to the higher layer and instructs to perform layer three filtering by replacing the previous measurement value with the value.
5) The UE1 high layer receives the indication of the physical layer, performs the layer three filtering again based on the latest RSRP/RSRQ measurement value to obtain an accurate measurement result, finds that the current serving cell signal is good enough, and does not need to trigger a measurement report.
In scenario two, cell 2 of the 5G base station operates in an unlicensed spectrum, periodically transmits a reference signal SSB with a period of 10ms, both terminals UE2 and UE3 are connected to cell 2, UE2 is located in the center of the cell and has a good channel condition, but UE3 is located at the edge of the cell and therefore has a poor channel condition.
1) At time t1, due to LBT failure, the base station does not successfully send the reference signal of cell 2, at this time, UE2 tries to receive the reference signal and obtains an RSRP/RSRQ value, which is lower than a preset threshold Th, and UE2 physical layer submits the RSRP/RSRQ measurement value to a higher layer, because UE2 cannot judge whether the RSRP/RSRQ measurement value is caused by poor channel conditions or due to LBT failure of the base station, UE2 starts a monitoring window, and the window duration is 80 ms;
2) at time t2(t2 ═ t1+10ms), LBT operation of the base station still fails, and thus the reference signal is not successfully sent, at this time, UE3 attempts to receive the reference signal and obtain RSRP/RSRQ measurement values, and UE3 physical layer submits the measurement values to higher layers, and since the RSRP/RSRQ values are lower than a preset threshold Th, UE3 also starts a listening window, the window duration being 80 ms;
3) at time t3(t3 ═ t1+20ms), the base station performs LBT failure, discarding the reference signal of cell 2;
4) at time t4(t4 ═ t1+30ms), the base station performs LBT success, the cell 2 reference signal is successfully transmitted, while the base station transmits the PDCCH scrambled with RM-RNTI, which carries DCI information indicating that 3 reference signals were dropped due to LBT failure before this time;
5) the UE2 receives the PDCCH scrambled by the RM-RNTI, receives the reference signal and obtains a new RSRP/RSRQ value (the value is higher than the threshold), the UE2 determines that the reference signal is discarded at the time t1 based on the received DCI information, so that the UE2 physical layer delivers the latest RSRP/RSRQ measurement value to the higher layer and indicates the value to replace the previous measurement value for layer three filtering, and after the UE2 higher layer receives the indication, the layer three filtering is carried out again based on the latest RSRP/RSRQ measurement value to obtain an accurate measurement result, and the current serving cell signal is found to be good enough without triggering a measurement report;
the UE3 also receives the RM-RNTI scrambled PDCCH, receives the reference signal and obtains a new RSRP/RSRQ value, the UE3 determines that the reference signal is discarded at time t2 based on the received DCI information, the UE3 physical layer delivers the latest RSRP/RSRQ measurement value to the higher layer, and instructs the previous measurement value to be replaced with the value for layer three filtering. Because the UE3 has a poor channel condition, the measurement value is still lower than the preset threshold Th, after the UE3 high layer receives the indication, the layer three filtering is performed again based on the latest RSRP/RSRQ measurement value to obtain an accurate measurement result, and if it is found that the current serving cell has a poor signal and other neighboring cells have signals better than the serving cell, the UE3 high layer triggers a measurement report, and the base station switches the UE3 to a neighboring cell having a better signal according to the measurement report.
In the third scenario, the cell 3 of the 5G base station operates in an unlicensed spectrum, and periodically transmits a reference signal SSB with a period of 10ms, both the terminal UE4 and the terminal UE5 are connected to the cell 3, the UE4 is located at the edge of the cell and has poor channel conditions, and the UE5 is located in the middle of the cell and has good channel conditions.
1) At the time of t1, the base station LBT successfully sends the reference signal of the cell 3, the UE4 tries to receive the reference signal and obtains an RSRP/RSRQ value, because the UE4 has a poor channel condition, the value is lower than a preset threshold Th, the UE4 physical layer submits the RSRP/RSRQ measurement value to a higher layer, and starts a monitoring window, the window duration is 100 ms;
2) at time t2(t2 ═ t1+10ms), LBT operation of the base station fails, and thus the reference signal is not successfully sent, at this time, UE5 attempts to receive the reference signal and obtain an RSRP/RSRQ measurement value, and the UE5 physical layer submits the measurement value to a higher layer, and since the RSRP/RSRQ value is lower than a preset threshold Th, UE5 also starts a listening window, the window duration being 100 ms;
3) at time t3(t3 ═ t1+20ms), the base station performs LBT failure, discarding the reference signal of cell 3;
4) at time t4(t4 ═ t1+30ms), the base station performs LBT success, the cell 3 reference signal is successfully transmitted, while the base station transmits the PDCCH scrambled with RM-RNTI, carrying DCI information thereon indicating that 2 reference signals were dropped due to LBT failure before this time;
5) the UE4 receives the PDCCH scrambled by the RM-RNTI, simultaneously receives the reference signal and obtains a new RSRP/RSRQ value, and the UE4 determines that the reference signal at the t1 moment is not discarded based on the received DCI information, namely the former measurement value is low, which is not caused by the non-transmission of the reference signal, but the current channel condition is poor;
the UE5 also receives the RM-RNTI scrambled PDCCH, receives the reference signal and obtains a new RSRP/RSRQ value, the UE5 determines based on the received DCI information that the reference signal at time t2 is discarded, the UE5 physical layer delivers the latest RSRP/RSRQ measurement to the higher layer, and instructs the previous measurement to be replaced with the value (i.e., the measurement at time t 2) for layer three filtering.
Fig. 4 is a schematic structural diagram of a reference signal measurement apparatus provided in an embodiment of the present invention, which is applied to a 5G base station operating in an unlicensed spectrum.
As shown in fig. 4, the reference signal measurement apparatus according to the embodiment of the present invention includes: a discarding unit 11 and a sending unit 12, wherein:
the discarding unit 11 is configured to discard the reference signal if LBT execution fails in a process of periodically sending the reference signal to the terminal;
specifically, when the 5G cell operates in the unlicensed spectrum, an LBT operation is performed before the reference signal is transmitted, and if the LBT fails (i.e., the channel is busy and there may be other devices transmitting), the current reference signal transmission is discarded and the next transmission opportunity is waited.
The sending unit 12 is configured to send, to the terminal, a PDCCH at a time when the LBT is successfully executed, where the DCI on the PDCCH carries the number of reference signals that have not been sent due to the LBT execution failure before the time of this sending.
Specifically, the 5G base station periodically transmits a reference signal, if a certain transmission time discards the reference signal due to LBT failure, and at a next successful transmission time of LBT, the base station transmits a PDCCH in a common search space while transmitting the reference signal, where the PDCCH carries DCI (Downlink control information) carrying special indication information indicating that N consecutive reference signals are not transmitted before the current time.
It should be noted that the DCI information may be, but is not limited to, an existing DCI format 1_0 in a 5G system, or a newly defined DCI format, where the DCI format includes a field indicating that N consecutive reference signals are not transmitted before the current transmission time.
The reference signal measuring device provided by the embodiment of the invention is applied to a 5G base station working in an unlicensed frequency spectrum, when a 5G cell works in the unlicensed frequency spectrum, if a reference signal is discarded due to LBT failure, the base station can inform a terminal of the number of the reference signals which are not sent due to LBT execution failure by sending DCI, so that the terminal can judge whether the reference signal sampling value obtained by the terminal is too low because the base station does not send the reference signal or because the channel condition is poor, and finally obtain an accurate reference signal measuring result.
On the basis of the foregoing embodiment, the sending unit is configured to send a PDCCH in the common search space, where the PDCCH is scrambled using a new radio network temporary identifier.
Specifically, the base station transmits a PDCCH in the common search space, and the PDCCH is scrambled using a new Radio Network Temporary Identity (Radio Network Temporary Identity).
The DCI may be, but is not limited to, DCI format 1_0 existing in the 5G system, or may be a new format, where the CRC is scrambled using a new Identity RM-RNTI (Radio Measurement-Radio Network Temporary Identity), and the DCI includes a Number of RS dropped field, where the field length may be, but is not limited to, 8 bits, and this information indicates how many consecutive reference signals are dropped before the current DCI receiving time. The other bits are reserved.
Fig. 5 is a schematic structural diagram of a reference signal measurement apparatus provided in an embodiment of the present invention, where the apparatus is applied to a terminal.
As shown in fig. 5, the reference signal measurement apparatus according to the embodiment of the present invention includes: a monitoring unit 21, a judging unit 22 and a measuring unit 23, wherein:
the monitoring unit 21 is configured to, in a process of receiving a reference signal periodically transmitted by a base station, monitor a PDCCH in a specified monitoring window when a measured value of the received reference signal is lower than a specified threshold, where DCI on the PDCCH carries a number of reference signals that are not transmitted due to LBT execution failure before a current transmission time;
wherein the reference signal measurement value may be a reference signal received power, RSRP, and/or a reference signal received quality, RSRQ.
Specifically, the terminal receives a decoded reference signal, and when a reference signal measurement value obtained by the physical layer is lower than a preset threshold, a monitoring window PDCCH is started. The DCI on the PDCCH carries special indication information which indicates that continuous N reference signals are not sent before the current time.
It should be noted that the DCI information may be, but is not limited to, an existing DCI format 1_0 in a 5G system, or a newly defined DCI format, where the DCI format includes a field indicating that N consecutive reference signals are not transmitted before the current transmission time.
The determining unit 22 is configured to, if the PDCCH is received in the designated monitoring window, determine, according to the number of reference signals that are not transmitted due to LBT execution failure before the current transmission time and are carried by the DCI on the PDCCH, whether a measurement value of a reference signal that is received before is lower than a designated threshold value due to the reference signal that is not transmitted due to LBT execution failure;
specifically, if the PDCCH is received in the monitoring window while receiving the reference signal, it is determined whether a previously obtained reference signal measurement value is lower than a threshold value due to the reference signal being discarded, based on DCI information on the PDCCH.
The measurement unit 23 is configured to, if the LBT fails to be performed and the reference signal is not transmitted, perform layer three filtering based on a measurement value of the latest received reference signal to obtain a measurement result.
Specifically, if the LBT fails to perform and the reference signal is not transmitted, the terminal physical layer delivers the latest obtained reference signal measurement value to the higher layer, and instructs the higher layer to perform layer three filtering by replacing the previous measurement value with the new measurement value, so that an accurate reference signal measurement result is obtained after filtering.
The reference signal measuring device provided by the embodiment of the invention is applied to a terminal, when a reference signal measured value received by the terminal is lower than a threshold value, a monitoring window is started, when DCI carrying indication information is monitored, whether the previous reference signal measured value is lower than the threshold value is caused by that a reference signal is not sent is judged, if yes, a high layer excludes the previous measurement sampling value when filtering is carried out, and finally an accurate reference signal measurement result is obtained. The method and the device can prevent the terminal from triggering the measurement report wrongly under the better channel condition, avoid improper triggering of switching, reduce the call drop probability caused by improper triggering, and improve the user service experience.
On the basis of the foregoing embodiment, the monitoring unit 21 is configured to monitor the PDCCH in a common search space, where the PDCCH is scrambled using a new radio network temporary identifier.
Specifically, the terminal monitors the PDCCH in a common search space, and the PDCCH is scrambled using a new Radio Network Temporary Identity (Radio Network Temporary Identity).
The DCI may be, but is not limited to, DCI format 1_0 existing in the 5G system, or may be a new format, where the CRC is scrambled using a new Identity RM-RNTI (Radio Measurement-Radio Network Temporary Identity), and the DCI includes a Number of RS dropped field, where the field length may be, but is not limited to, 8 bits, and this information indicates how many consecutive reference signals are dropped before the current DCI receiving time. The other bits are reserved.
On the basis of the above embodiment, the measurement unit 23 is configured to submit the latest received reference signal measurement value to the higher layer by the terminal physical layer, and instruct the higher layer to perform layer three filtering by replacing the previous measurement value with the latest measurement value, so that an accurate reference signal measurement result is obtained after filtering.
Specifically, if the terminal determines that the previous reference signal measurement value is lower than the threshold value based on the DCI information because the reference signal is not transmitted, the terminal physical layer submits an indication message and the latest obtained reference signal measurement value to the higher layer, and after receiving the indication message, the terminal higher layer performs layer three filtering by using the latest reference signal measurement value instead of the previous measurement value, so as to obtain a measurement result.
On the basis of the above embodiment, the apparatus further includes:
and the processing unit is used for not monitoring the PDCCH any more when the appointed monitoring window is finished.
Specifically, when the monitoring window ends, the terminal does not monitor the PDCCH any more.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
An example is as follows:
fig. 6 illustrates a physical structure diagram of a server, and as shown in fig. 6, the server may include: a processor (processor)31, a communication Interface (communication Interface)32, a memory (memory)33 and a communication bus 34, wherein the processor 31, the communication Interface 32 and the memory 33 are communicated with each other via the communication bus 34. The processor 31 may call logic instructions in the memory 33 to perform the following method: in the process of periodically sending the reference signal to the terminal, if the LBT execution fails, the reference signal is discarded; and after the LBT is successfully executed, sending a reference signal to the terminal at the moment, and simultaneously sending a PDCCH to the terminal, wherein the DCI on the PDCCH carries the number of the reference signals which are not sent due to the LBT execution failure before the moment of sending.
In addition, the logic instructions in the memory 33 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Claims (10)
1. A reference signal measurement method, applied to a 5G base station operating in an unlicensed spectrum, the method comprising:
in the process of periodically sending the reference signal to the terminal, if the LBT execution fails, the reference signal is discarded;
and after the LBT is successfully executed, sending a reference signal to the terminal at the moment, and simultaneously sending a PDCCH to the terminal, wherein the DCI on the PDCCH carries the number of the reference signals which are not sent due to the LBT execution failure before the moment of sending.
2. The method of claim 1, wherein the sending the PDCCH to the terminal comprises:
and sending a PDCCH in the common search space, wherein the PDCCH is scrambled by using a new wireless network temporary identifier.
3. A reference signal measurement method is applied to a terminal, and is characterized in that the method comprises the following steps:
in the process of receiving a reference signal periodically transmitted by a base station, when a measured value of the received reference signal is lower than a specified threshold value, monitoring a PDCCH in a specified monitoring window, wherein the DCI on the PDCCH carries the number of the reference signals which are not transmitted due to LBT execution failure before the current transmission moment;
if the PDCCH is received in the appointed monitoring window, judging whether the measured value of the reference signal received before is lower than an appointed threshold value or not because the reference signal is not sent due to LBT execution failure according to the number of the reference signal which is carried by the DCI on the PDCCH and is not sent before the current sending time due to LBT execution failure;
and if the LBT is caused by failure in LBT execution and no reference signal is sent, performing layer three filtering based on the measured value of the newly received reference signal to obtain a measured result.
4. The method of claim 3, wherein the monitoring the PDCCH within a specified monitoring window comprises:
and monitoring the PDCCH in a public search space, wherein the PDCCH uses a new wireless network temporary identifier for scrambling.
5. The method of claim 3, wherein the performing layer three filtering based on the measurement of the most recently received reference signal to obtain a measurement comprises:
and the terminal physical layer submits the latest received reference signal measurement value to a high layer and indicates the high layer to replace the previous measurement value with the latest measurement value to execute layer three filtering, so that an accurate reference signal measurement result is obtained after filtering.
6. The method of claim 3, further comprising:
and when the appointed monitoring window is finished, the PDCCH is not monitored any more.
7. A reference signal measurement apparatus, the apparatus being applied to a 5G base station operating in unlicensed spectrum, the apparatus comprising:
a discarding unit, configured to discard the reference signal if LBT execution fails in a process of periodically sending the reference signal to the terminal;
and a sending unit, configured to send, to the terminal, a PDCCH at a time when the LBT is successfully executed, where the DCI on the PDCCH carries the number of reference signals that have not been sent due to the LBT execution failure before the time of the current sending.
8. A reference signal measurement device, the device is applied to a terminal, and the device comprises:
a monitoring unit, configured to monitor a PDCCH in a specified monitoring window when a received reference signal measurement value is lower than a specified threshold in a process of receiving a reference signal periodically transmitted by a base station, where DCI on the PDCCH carries a number of reference signals that have not been transmitted due to LBT execution failure before a current transmission time;
a determining unit, configured to determine, if the PDCCH is received in the designated monitoring window, whether a measurement value of a previously received reference signal is lower than a designated threshold value due to an LBT execution failure and no reference signal transmission according to the number of reference signals that are not transmitted due to an LBT execution failure before the current transmission time and are carried by the DCI on the PDCCH;
and the measurement unit is used for performing layer three filtering based on the measurement value of the reference signal which is received latest if the LBT execution fails and the reference signal is not transmitted, so as to obtain a measurement result.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the reference signal measurement method according to any of claims 1 to 6 are implemented when the processor executes the program.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the reference signal measurement method according to any one of claims 1 to 6.
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