CN102215499B - Method for determining occurrence time of measurement event - Google Patents
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Abstract
The invention provides a method for determining occurrence time of a measurement event. According to the method, a time interval of reporting a measurement report relative to the occurrence time of the measurement event is recorded and the time interval is reported to a network side through the measurement report, so that the problem of use time inconsistency at a UE (Use Equipment) side and the network side can be effectively overcome, and the network side is ensured to obtain a network standard time according to the network standard time when the measurement event occurs.
Description
Technical Field
The present invention relates to a measurement technique in a mobile communication system, and more particularly, to a method of determining a time when a measurement event occurs.
Background
In TD-SCDMA systems, layer 1 provides measurement specifications for User Equipment (UE) and mobile communication system terrestrial radio access network (UTRAN), which comprise a range of measurement capabilities. These measurements are divided into different measurement types like frequency measurements, inter-system measurements, communication capacity measurements, communication quality measurements and internal measurements. The UTRAN initiates a measurement by sending a "measurement control message" to the UE, which contains: measurement Identification (ID), measurement type, command (including setting up, changing or releasing measurements), measurement target, measurement volume, reporting mechanism (including periodic or event triggered), and mode (including acknowledged or unacknowledged). When the reporting mechanism is satisfied, the UE sends a measurement report to the UTRAN, where the measurement report includes the measurement ID and the measurement result. In IDLE mode, measurement control messages are broadcast in system messages.
Reporting the measurement to the UTRAN by the UE can be divided into real-time reporting and non-real-time reporting, wherein the real-time reporting means that the UE immediately reports a corresponding measurement report to the network after completing the measurement required by the network; the non-real-time reporting means that the UE reports the network after completing the measurement. For UTRAN, the measurement reported by the UE not only assists the network in cell selection/reselection and handover, but also helps the network to locate some problems, and preferably, the network side can correlate the measurement reported by the UE with the measurement of the network side itself, and identify and locate some problems of network specifications and network quality, such as coverage optimization problems, mobility problems, capacity problems, common channel parameter setting problems, and the like. In this way, the network side desires to obtain some radio parameters measured by the UE and also to obtain time information (i.e., occurrence time of a measurement event) when the UE measures the radio parameters, and the network side desires to include the time information in the measurement report message and transmit the measurement report message to the network.
The TD-SCDMA system is a whole network synchronization system, and the whole network realizes synchronization through a Global Positioning System (GPS), so the time of the network side is GPS time, which is generally called "network standard time". While the time on the UE side is non-GPS time. Therefore, in order to make the network side know the occurrence time of the measurement event, how to correspond the time reported by the UE to the time of the network side needs to be considered.
At present, a method for making the network side know the occurrence time of the measurement event is not proposed.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for determining the occurrence time of a measurement event, which enables a network side to know the occurrence time of the measurement event.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method of determining when a measurement event occurs, the method comprising the steps of:
a. the User Equipment (UE) determines the time interval d between the occurrence of a measurement event and the reporting of a corresponding measurement report according to the local time or the System Frame Number (SFN)1-transmitting said time interval to a base station (NodeB) including in said measurement report;
b. the NodeB records the SFN number T when the measurement report is received3Will T3Converting into Connection Frame Number (CFN), performing Frame Protocol (FP) package on the measurement report, and converting into CFN T3The FP packet is sent to a Radio Network Controller (RNC) by being contained in the packet header of the FP packet;
c. when the RNC has the capability of obtaining the current network standard time, the RNC records the connection frame number T when the FP packet is received4And determining the T4Corresponding network standard time Tnetwork_stan dardCalculating T4And T in the FP packet3Difference d of2D is mixing2And stationD in the measurement report1Respectively converted into Greenwich time format according to Ttriger_measure＝Tnetwork_stan dard-d1-d2Calculating the network standard time T when the measurement event occurstriger_measure；
When the RNC does not have the capability of obtaining the current network standard time, the RNC records the current connection frame number T when receiving the FP packet4And counting the CFNs at the same time until the measurement report in the FP packet needs to be sent to other network entities, wherein the network entities are the network entities which are specified by the system and used for determining the network standard time when the measurement event occurs, and calculating the T4And T in the FP packet3Difference d of2Calculating the counting result of the CFN and the d2And d3D is mixing3Including sending to the network entity in the measurement report, the network entity determining a network standard time T 'at which the measurement report was received'network_stan dardAccording to Ttriger_measure＝T′nelwork_stan dard-d1-d3Calculating the network standard time T when the measurement event occurstriger_measure。
In summary, the method for determining the occurrence time of the measurement event according to the present invention records the time interval between the reporting of the measurement report and the occurrence of the measurement event, and reports the time interval to the network side through the measurement report, so that the problem of inconsistent time used by the UE side and the network side can be effectively solved, and the network side can know the network standard time when the measurement event occurs according to the network standard time.
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Fig. 1 is a flowchart of a first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The UE may use two modes, i.e. absolute time and relative time, when recording the occurrence time information of the measurement event. The absolute time is consistent with the standard time of the network, which requires the network side to send the standard time of the network to the UE, and the network side can send the standard time of the network to the UE through broadcast messages or Radio Resource Control (RRC) signaling, but the format of the system messages or the format of the RRC signaling needs to be modified, which greatly changes the standard; the relative time refers to a period of time interval when the measurement event occurs, and as long as the network side knows the time interval and the network standard time corresponding to the end point of the time interval, the start point corresponding to the time interval, that is, the time when the measurement event occurs can be known, so that the network does not need to notify the standard time to the UE.
Based on this, the core idea of the invention is: and the UE side records and reports the time of the measurement event in a relative time form. Specifically, the UE records the time interval between the occurrence of the measurement event and the reporting of the measurement report in the measurement report through the measurement report and notifies the network side, so that the network side can calculate the network standard time corresponding to the occurrence time of the measurement event according to the network standard time when the measurement report is received and the time interval carried in the measurement report.
Fig. 1 is a flowchart of a first embodiment of the present invention. As shown in fig. 1, this embodiment includes the steps of:
In this step, the UE records the occurrence time of the measurement event in a relative time manner, i.e. according to the local time or the systemFrame Number (SFN) determining the time interval d between the occurrence of a measurement event and the reporting of a measurement report1Therefore, in the subsequent process, the network side can calculate the occurrence time of the corresponding measurement event according to the network standard time when the measurement report is received. In this embodiment, the time interval d may be obtained by extracting a local time or a system frame number statistics manner1。
Specifically, the UE determines the time interval d between the occurrence of a measurement event and the reporting of a corresponding measurement report according to the local time1The method of (1) may be:
when the measurement event occurs, the UE records the current local time T1；
When the UE reports the measurement report generated during measurement to the NodeB according to the requirement of the reporting mechanism in the measurement configuration, i.e. the reporting mechanism is periodically reported or event triggered, i.e. when the period of periodic reporting comes or an event triggered to report occurs, the UE needs to report the measurement report generated during measurement to the NodeB, and the UE records the local time T at that time2UE according to d1＝T2-T1Calculating said time interval d1。
Specifically, the UE determines the time interval d between the occurrence of the measurement event and the reporting of the measurement report according to the SFN1The method of (1) may be:
when the measurement event occurs, the UE starts counting SFN numbers;
stopping the counting when the UE needs to report a measurement report generated during measurement to the NodeB, and taking the counting result as the time interval d1。
It should be noted that the time length of one SFN is 10ms, the SFN count is in a cyclic count manner, i.e., the SFN number is counted from 0 to 4095, the next SFN is counted from 0 again, i.e., the count period of the SFN is 4096, and the time length of 4096 SFNs is 40960ms, i.e., 40.96 seconds. The time when the UE measurement occurs and the time interval reported by the measurement are likely to exceed 4096 SFNs, and thus the time range for recording the SFN may not be sufficient. Therefore, further, in order to avoid that the UE counts more difficultly and the reported information amount is too large due to too large time interval in practical application, the following two methods of recording the time interval by using the SFN number may be adopted:
the method comprises the following steps:
when the SFN number is counted, the current counting unit can be converted into a format of Greenwich mean time from the SFN, namely a mode of day-hour-minute-second, and the time is increased by 10ms when one SFN is counted; correspondingly, the format of the counting result to be reported is the format of Greenwich mean time.
The second method comprises the following steps:
when the counting is performed, a 4096-system counting method is adopted. Here, the 4096 th order is the same as the existing binary, octal, decimal, etc. principles, i.e. one bit is added for every 4096 SFNs, and those skilled in the art can implement 4096 th order according to the existing binary principles, and will not be described herein again.
Accordingly, the resulting time interval d1Is in 4096-ary format, where m represents a multiple of 4096 SFNs and n represents the remainder within 4096 SFNs, assuming a representation in m-n format. For example, if the relative time reported to the network by the UE is 100-: 100 × 4096+321 is 409921 in SFN.
In practical application, the time interval d is obtained by counting the system frame number1The method of (2) may have the following problems:
if the UE is powered off in the counting process, the counting is lost, and even if the subsequent UE is powered on again, the accurate reporting of the SFN counter value cannot be finished.
To overcome the above problem, further, when the counting is performed (i.e. during the period from the measurement occurrence to the reporting measurement), if the UE performs the power-off operation, the measurement report is invalid, i.e. the reporting of the measurement report is not required. Thereafter, when the UE is powered back on, the network may decide again if necessary whether to reconfigure the measurements to the UE.
In practical application, the time interval d is obtained by extracting local time or counting the system frame number1A threshold may be further specified for the time interval, such as 1000 times 2 days or 4096 SFNs, etc., and different thresholds may be specified for measurements applied in different scenarios. If the time value recorded by the measurement report exceeds a specified threshold, the measurement report is considered to be invalid, and the UE can discard the measurement report. This not only helps to maintain the validity of the measurement log, but also helps to reduce the amount of information in the reporting interval.
Specifically, when the UE acquires the time interval d by extracting the local time1The above object can be achieved by the following two methods:
the method comprises the following steps:
the UE calculates the current local time and the T in real time1And if the time difference is greater than a preset time difference threshold, the UE cancels the report of the measurement report and exits the method.
In the first method, when the time difference is greater than the preset time difference threshold, the current measurement event and the corresponding measurement report are both invalid, that is, the UE does not need to perform the measurement and report the corresponding measurement report thereafter.
The second method comprises the following steps:
the UE calculates the current local time and the T in real time1And if the time difference is larger than a preset time difference threshold, discarding the currently generated measurement report, including the measured wireless parameters and the time information. Then UE restarts counting SFN number, and continues to carry out corresponding measurement according to the requirement of measurement configuration, and generates corresponding measurement report, thus ensuringIt is proved that the measurement reported by the UE to the network side is always the latest measurement.
Similarly, the time interval d is obtained by counting the system frame number1In this case, the following two methods may be adopted:
the method comprises the following steps:
and when counting, if the current counting value is greater than a preset SFN threshold, the UE cancels the report of the measurement report and exits the method.
The second method comprises the following steps:
and during counting, if the current count value is greater than a preset SFN threshold, clearing the count, discarding the currently generated measurement report, restarting counting the SFN number, and continuously generating a corresponding measurement report according to the current measurement.
Each threshold in the above method may be set by a person skilled in the art according to an actual application scenario, and details are not described here.
This step is mainly used to record the time when the NodeB receives the measurement report, and notify the time to the RNC through the header of the FP packet, so that the RNC can calculate the processing delay of the measurement report at the NodeB according to the time, and further calculate the occurrence time of the measurement event according to the processing delay.
It should be noted that the SFN is used for counting the transmission of air interface radio frames, the numerical range is 0 to 4095, and the counting of the value is synchronous at the UE side and the NodeB side; and the counting of the wireless frames between the NodeB and the RNC is realized through CFN, the numerical range of the CFN is 0-255, and the counting of the CFN at the NodeB side and the RNC side is synchronous.
The time recorded when the NodeB receives the measurement report is SFN, and the time recorded when the RNC receives the FP packet transmitted by the NodeB is CFN, so the NodeB needs to convert this SFN into CFN, so that the RNC calculates the processing delay of the measurement report at the NodeB from this time and the time when the RNC receives the FP packet. For uplink transmission, the relationship between SFN and CFN can be determined by the following equation:
CFN＝(SFN-Frame Offset)mod 256(from L1 to L2)
the Frame Offset is a layer 1 parameter specific to a radio link, and the value range is 0 to 255, and the parameter is calculated by a Serving RNC (SRNC) and sent to the NodeB. And the NodeB calculates the CFN corresponding to the SFN by using the formula according to the SFN when the air interface data is received.
103, when the RNC has the capability of obtaining the current network standard time, the RNC records the connection frame number T when the FP packet is received4And determining the T4Corresponding network standard time Tnetwork_stan dardCalculating T4And T in the FP packet3Difference d of2D is mixing2And d in the measurement report1Respectively converted into Greenwich time format according to Ttriger_measure＝Tnetwork_stan dard-d1-d2Calculating the network standard time T when the measurement event occurstriger_measure。
Here, when the RNC has the capability of obtaining the current network standard time, the connection frame number when the FP packet is received may be converted into the corresponding network standard time, and a specific conversion method is known to those skilled in the art and is not described herein again. Thus, the RNC can obtain the network standard time when the measurement event occurs according to the network standard time, the processing time of the NodeB on the measurement report, and the time interval carried in the measurement report.
Wherein,T4and T in the FP packet3Difference d of2The processing time of the NodeB on the measurement report. Since the format of the network standard time is the format of Greenwich mean time, and d2Is CFN, therefore, d needs to be reduced2Conversion to Greenwich time format for Ttriger_measure＝Tnetwork_stan dard-d1-d2Obtaining the network standard time T when the measurement event occurstriger_measure. Also, if d in the measurement report1In SFN format, conversion to greenwich time format is also required.
When the RNC does not have the capability of obtaining the current network standard time, the RNC records the current connection frame number T when receiving the FP packet4And simultaneously counting the CFNs until the measurement report in the FP packet needs to be sent to other network entities, wherein the network entities are network entities which are specified by a system and used for determining the network standard time when the measurement event occurs. RNC calculates T4And T in the FP packet3Difference d of2Calculating the counting result of the CFN and the d2And d3D is mixing3Including sending to the network entity in the measurement report, the network entity determining a network standard time T 'at which the measurement report was received'network_stan dardAccording to Ttriger_measure＝T′network_stan dard-d1-d3Calculating the network standard time T when the measurement event occurstriger_measure。
In this step, counting the CFNs until the measurement report in the FP packet needs to be sent to other network entities, so as to obtain a processing delay at the RNC side; calculating T4And T in the FP packet3Difference d of2For obtaining the processing delay of the NodeB side; calculating the counting result of the CFN and the d2And d3Then the sum d of the processing time delay of the measurement report at the NodeB side and the RNC side can be obtained3。
Here, when the RNC does not haveWhen the capability of the current network standard time is obtained, the RNC needs to send the measurement report to a network entity designated by the system and used for determining the network standard time when the measurement event occurs, and simultaneously notifies the network entity of the processing delay of the measurement report at the NodeB side and the RNC side, so that the network entity can receive the network standard time when the measurement report is received and the processing delay d3And time interval d in the measurement report1According to Ttriger_measure＝T′network_stan dard-d1-d3Calculating the network standard time T when the measurement event occurstriger_measure。
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of determining when a measurement event occurs, the method comprising the steps of:
a. the User Equipment (UE) determines the time interval d between the occurrence of a measurement event and the reporting of a corresponding measurement report according to the local time or the System Frame Number (SFN)1-transmitting said time interval to a base station (NodeB) including in said measurement report;
b. the NodeB records the SFN number T when the measurement report is received3Will T3Conversion into corresponding Connection Frame Number (CFN), toThe measurement report is subjected to Frame Protocol (FP) packaging, and T converted into CFN3The FP packet is sent to a Radio Network Controller (RNC) by being contained in the packet header of the FP packet;
c. when the RNC has the capability of obtaining the current network standard time, the RNC records the connection frame number T when the FP packet is received4And determining the T4Corresponding network standard time Tnetwork_standardCalculating T4And T in the FP packet3Difference d of2D is mixing2And d in the measurement report1Respectively converted into Greenwich time format according to Ttriger_measure＝Tnetwork_standard-d1-d2Calculating the network standard time T when the measurement event occurstriger_measure；
When the RNC does not have the capability of obtaining the current network standard time, the RNC records the current connection frame number T when receiving the FP packet4And counting the CFNs at the same time until the measurement report in the FP packet needs to be sent to other network entities, wherein the network entities are the network entities which are specified by the system and used for determining the network standard time when the measurement event occurs, and calculating the T4And T in the FP packet3Difference d of2Calculating the counting result of the CFN and the d2And d3D is mixing3Including sending to the network entity in the measurement report, the network entity determining a network standard time T 'at which the measurement report was received'network_standardAccording to Ttriger_measure＝T'network_standard-d1-d3Calculating the network standard time T when the measurement event occurstriger_measure。
2. The method of claim 1, wherein the determining the time interval d between the occurrence of a measurement event and the reporting of a corresponding measurement report in step a1The method comprises the following steps:
a1, when the measurement event happens, the UE records the current local time T1；
a2, when the UE needs to report the measurement report generated in the measurement to the base station, recording the current local time T2According to d1＝T2-T1Calculating said time interval d1。
3. The method of claim 1, wherein the determining the time interval d between the occurrence of a measurement event and the reporting of a corresponding measurement report in step a1The method comprises the following steps:
a1, when the measurement event occurs, the UE starting counting SFN number;
a2, stopping the counting when the UE needs to report the measurement report generated in the measurement to the base station, and using the counting result as the time interval d1。
4. The method of claim 3, wherein the step a further comprises:
converting the current count value from SFN into format of Greenwich mean time during counting;
the format of the counting result in the step a2 is greenwich mean time format.
5. The method of claim 3, wherein the step a further comprises:
when the counting is performed, the counting is performed in a 4096-ary manner.
6. The method of claim 3, wherein step a further comprises:
and when counting is carried out, if the UE executes shutdown operation, the measurement report is invalid, and the method is exited.
7. The method of claim 3, wherein step a further comprises:
and when counting, if the current counting value is greater than a preset SFN threshold, the UE cancels the report of the measurement report and exits the method.
8. The method of claim 3, wherein step a further comprises:
and during counting, if the current count value is greater than a preset SFN threshold, clearing the count, discarding the currently generated measurement report, restarting counting the SFN number, and continuously generating a corresponding measurement report according to the current measurement.
9. The method of claim 2, further comprising between steps a1 and a 2:
the UE calculates the current local time and the T in real time1And if the time difference is greater than a preset time difference threshold, the UE cancels the report of the measurement report and exits the method.
10. The method of claim 3, further comprising between steps a1 and a 2:
the UE calculates the current local time and the T in real time1And if the time difference is larger than a preset time difference threshold, discarding the currently generated measurement report, restarting counting the SFN number, and continuously generating a corresponding measurement report according to the current measurement.
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| WO2008156326A2 (en) * | 2007-06-20 | 2008-12-24 | Electronics And Telecommunications Research Institute | Method of multiplexing transmission frame of digital broadcasting signal, apparatus for multiplexing transmission frame, and transmitting apparatus |
| CN101388713A (en) * | 2007-09-14 | 2009-03-18 | 展讯通信（上海）有限公司 | Method for calibrating GPS standard time in TD-SCDMA radio communication system |
| CN101631049A (en) * | 2008-07-18 | 2010-01-20 | 郑州威科姆科技股份有限公司 | Method and device for testing network time service precision |
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| WO2008156326A2 (en) * | 2007-06-20 | 2008-12-24 | Electronics And Telecommunications Research Institute | Method of multiplexing transmission frame of digital broadcasting signal, apparatus for multiplexing transmission frame, and transmitting apparatus |
| CN101388713A (en) * | 2007-09-14 | 2009-03-18 | 展讯通信（上海）有限公司 | Method for calibrating GPS standard time in TD-SCDMA radio communication system |
| CN101631049A (en) * | 2008-07-18 | 2010-01-20 | 郑州威科姆科技股份有限公司 | Method and device for testing network time service precision |
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