CN102291730A - Radio link monitoring method, device and system - Google Patents
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- 230000011664 signaling Effects 0.000 claims description 33
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- 238000012545 processing Methods 0.000 claims description 11
- 238000009499 grossing Methods 0.000 claims description 2
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Abstract
The invention discloses a radio link monitoring method, device and system, which can be used for improving the reliability of radio monitoring of a terminal. The radio link monitoring method comprises the following steps: a base station determines the information of inference level of subframes; and the base station informs the information of interference level of the subframes to the terminal, wherein the information of inference level of the subframes is provided to the terminal for monitoring radio links.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for monitoring a wireless link.
Background
In the existing Long Term Evolution (LTE) standard, a User Equipment (UE) uses the received quality of a downlink common pilot (RSRQ) as a reference for radio link monitoring. The physical layer of the UE periodically compares the RSRQ measurement result with a specified threshold, and if the RSRQ measurement result is lower than the out-of-step threshold Qout, the out-of-sync is reported to the RRC layer once; and if the in-sync threshold is higher than the Qin, reporting the in-sync once to a radio resource control protocol (RRC) layer. The UE may select any one subframe to perform measurement, or may average measurement results of several subframes.
Since the UE-specific measurement mechanism is not standardized, it may cause a difference between the radio link monitoring result and the real situation. For example, the UE may normally operate on a subframe with small partial interference, but the RSRQ measurement selects a subframe with large interference, and if the result of the determination is lower than the out-of-synchronization threshold Qout, the UE reports out-of-sync to the RRC layer, that is, the UE determines that the radio link fails and requires to perform RRC connection reestablishment. In fact, most subframes may have relatively low interference and may be provided for the UE to work normally, so that the reliability of the radio link monitoring is not high and system resources are wasted.
In summary, with the introduction of the time domain interference coordination technology, there may be a large difference in the quality of the radio link on different time domain resources. Whereas conventional UE-side radio link monitoring assumes that the radio link quality fluctuation over different time domain resources is small. The UE does not know the possible radio link quality difference, and therefore, the reliability of the radio link monitoring performed by the UE is low.
Disclosure of Invention
The invention provides a method, a device and a system for monitoring a wireless link, which are used for improving the reliability of the wireless link monitoring of a terminal.
The embodiment of the invention provides a method for monitoring a wireless link, which comprises the following steps:
the base station determines subframe interference level information;
and the base station informs the terminal of the subframe interference level information, and the subframe interference level information is used for providing the terminal for wireless link monitoring.
The embodiment of the invention provides a method for monitoring a wireless link, which comprises the following steps:
a terminal obtains subframe interference level information determined by a base station;
and the terminal monitors the wireless link according to the subframe interference level information.
The embodiment of the invention provides a device for monitoring a wireless link, which comprises:
a judging unit for determining subframe interference level information;
and the sending unit is used for informing the terminal of the subframe interference level information, and the subframe interference level information is used for providing the terminal for wireless link monitoring.
The embodiment of the invention provides a device for monitoring a wireless link, which comprises:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring subframe interference level information determined by a base station;
and the processing unit is used for monitoring the wireless link according to the subframe interference level information.
The embodiment of the invention provides a system for monitoring a wireless link, which comprises:
a base station for determining subframe interference level information; informing the terminal of the information of the possible large interference subframes;
the terminal is used for obtaining the subframe interference level information determined by the base station; and monitoring a wireless link according to the subframe interference level information.
In the embodiment, a base station determines subframe interference level information; and informing the terminal of the subframe interference level information, and monitoring a wireless link by the terminal by using the acquired subframe interference level information. The embodiment of the invention can ensure the reliability of the UE wireless link monitoring when the quality of the wireless links on different time domain resources has larger difference. And the monitoring reliability of the UE wireless link is improved.
Drawings
Fig. 1 is a flowchart illustrating a method for monitoring a wireless link at a network side according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for performing radio link monitoring at a terminal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for radio link monitoring on a network side according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for monitoring a wireless link at a terminal side according to an embodiment of the present invention.
Detailed Description
In order to improve the reliability of the terminal in wireless link monitoring, in the embodiment of the invention, a base station determines subframe interference level information; and informing the terminal of the subframe interference level information, and monitoring a wireless link by the terminal by using the acquired subframe interference level information.
Referring to fig. 1, a method for monitoring a wireless link at a network side according to an embodiment of the present invention includes the following steps:
step 101: the base station determines subframe interference level information.
The subframe interference level information is interference level information of each subframe, or indication information of a possible large interference subframe set, or indication information of a possible small interference subframe set, wherein the possible large interference subframe is a subframe of which the interference intensity exceeds a set threshold; the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
The subframe interference level information may be explicit information or implicit information.
Such as: if the subframe interference level information is possible large interference subframe information, the base station determines that the possible large interference subframe can be implemented according to various ways, such as:
the base station determines a possible large interference subframe through a set interference coordination algorithm; or,
the base station periodically counts the quality information of wireless channels of all subframes reported by the central terminal, and determines the subframe of which the statistical result of the quality information of the wireless channels meets a specific condition as a large-interference subframe; or,
the base station periodically counts the wireless channel quality information of each subframe reported by all the terminals, and determines the subframe of which the statistical result of the wireless channel quality information meets a specific condition as a large-interference subframe.
Similar to the above embodiments, when the subframe interference level information is possible small interference subframe information, the description is omitted here.
Step 102: and the base station informs the terminal of the subframe interference level information, and the subframe interference level information is used for providing the terminal for wireless link monitoring.
The base station may notify the subframe interference level information to a terminal served by the base station by means of system broadcast, RRC dedicated signaling, Medium Access Control (MAC) dedicated signaling, or physical layer dedicated signaling.
Referring to fig. 2, a method for performing radio link monitoring at a terminal side according to an embodiment of the present invention includes the following steps:
step 201: and the terminal obtains the subframe interference level information determined by the base station.
The subframe interference level information is interference level information of each subframe, or indication information of a possible large interference subframe set, or indication information of a possible small interference subframe set,
the possible large interference subframes are subframes with interference intensity exceeding a set threshold;
the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
The subframe interference level information is explicit information or implicit information.
The terminal may obtain the subframe interference level information determined by the base station from the received system broadcast, RRC dedicated signaling, MAC dedicated signaling, or physical layer dedicated signaling.
Step 202: and the terminal monitors the wireless link according to the subframe interference level information.
In step 202, the terminal may perform radio link monitoring according to the subframe interference level information, including:
the UE can determine a small interference subframe according to the subframe interference level information, measure the position of the determined small interference subframe and monitor a wireless link according to a measurement result; or,
and the UE determines the position of a large interference subframe and the position of a small interference subframe according to the subframe interference level information, measures the positions of the large interference subframe and the small interference subframe respectively, smoothes the measurement result of each subframe, and monitors a wireless link according to the smoothed result.
Of course, the UE may also perform measurement on the scheduled subframe and perform radio link monitoring according to the measurement result.
The technical solution of the present invention will be described in detail below with reference to specific examples.
In this embodiment, a method for improving UE radio link monitoring reliability is introduced, where a base station determines a possible large interference subframe and notifies the UE of the information, and the UE enhances a radio link monitoring process according to the information provided by the base station.
First, base station judges possible large interference subframe
If a specific interference coordination algorithm is used among the base stations, a possible large-interference subframe can be judged through information interaction among the base stations. The information interaction between the base stations can be realized through information interaction interfaces existing between the base stations, including but not limited to an X2 interface, an S1 interface, an O & M interface, an air interface, UE transfer and the like. The specific content of the interaction may be one or a combination of information that the local base station will transmit signals or transmit high-power signals on some subframes, the neighboring base station may transmit signals or transmit high-power signals on some subframes, the local base station will not transmit signals or only transmit low-power signals on some subframes, and the neighboring base station cannot transmit signals or only transmit low-power signals on some subframes.
If no specific interference coordination algorithm is used among the base stations, the possible large-interference subframes can be estimated through the downlink wireless channel quality feedback received by the base station side. The statistics may be performed based on feedback of a specific UE or based on feedback of all UEs.
The following 3 methods for determining the interference level of a specific subframe by a base station are given, and it should be noted that the following methods are only implementation algorithms inside the base station.
Example 1:
the base stations realize interference coordination through an X2 interface, and the interactive information is that the base station 1 transmits signals on the first half of downlink subframes and the base station 2 transmits signals on the second half of downlink subframes. According to the above information, the base station 1 will determine the second half of the downlink subframes as large interference subframes, and the base station 2 will determine the first half of the downlink subframes as large interference subframes.
Example 2:
and no interference coordination mechanism exists among the base stations, the base stations periodically count the wireless channel quality information of each subframe reported by the central UE, and if the wireless channel quality information counting result of a certain subframe meets a specific condition, the subframe is judged to be a large-interference subframe. Conditions that may be used include, but are not limited to, the following:
the sub-frame radio channel quality is Thre1 lower than the average value of all sub-frame radio channel qualities;
the sub-frame radio channel quality is lower than Thre2 n times in succession.
Example 3:
and no interference coordination mechanism exists among the base stations, the base stations periodically count the wireless channel quality information of all subframes reported by all the UE, and if the wireless channel quality information statistical result of a certain subframe meets a specific condition, the subframe is judged to be a large-interference subframe. Conditions that may be used include, but are not limited to, the following:
and in the sub-frame wireless channel quality reported by all the UE, the value of p% is lower than Thre 3.
The base station informs the UE of the possible large interference subframes.
After the base station obtains the relevant information of the large interference subframe, the base station informs the UE served by the base station of the information in a system broadcast or RRC dedicated signaling or MAC dedicated signaling or physical layer dedicated signaling mode. Specific indications include, but are not limited to, the following: indicating the interference situation for each subframe separately, or, indicating only a set of large (or small) interference subframes.
Four examples are given below
Example 1:
the base station notifies the interference situation on each downlink subframe through system broadcast, for example, indicates the interference situation of each downlink subframe in a bitmap manner, wherein the interference situation can be quantified into a plurality of classes for indication.
Example 2:
and the base station informs a plurality of downlink subframe sets with different interference levels through system broadcasting. For example, all downlink subframes are divided into Set a and Set B, which respectively correspond to subframes with large interference and subframes with small interference, and indicate the downlink subframes included in Set a and Set B.
Example 3:
the base station notifies the interference situation on each downlink subframe through the dedicated RRC signaling of the UE, for example, indicates the interference situation of each downlink subframe in a bitmap manner, where the interference situation may be quantized into several classes for indication.
Example 4:
and the base station informs a plurality of downlink subframe sets with different interference levels through dedicated RRC signaling of the UE. For example, all downlink subframes are divided into Set a and Set B, which respectively correspond to subframes with large interference and subframes with small interference, and indicate the downlink subframes included in Set a and Set B.
Example 5:
the base station notifies the interference situation on each downlink subframe through the MAC dedicated signaling, for example, indicates the interference situation of each downlink subframe in a bitmap manner, where the interference situation may be quantized into several classes for indication.
Example 6:
and the base station informs a plurality of downlink subframe sets with different interference levels through MAC special signaling. For example, all downlink subframes are divided into SetA and Set B, which correspond to subframes with large interference and subframes with small interference, respectively, and indicate the downlink subframes included in Set a and Set B.
Example 7:
the base station notifies the interference situation on each downlink subframe through a physical layer dedicated signaling, for example, indicates the interference situation of each downlink subframe in a bitmap manner, wherein the interference situation can be quantized into a plurality of classes for indication.
Example 8:
and the base station informs a plurality of downlink subframe sets with different interference levels through a physical layer special signaling. For example, all downlink subframes are divided into SetA and Set B, which correspond to subframes with large interference and subframes with small interference, respectively, and indicate the downlink subframes included in Set a and Set B.
And the UE enhances the wireless link monitoring process according to the information provided by the base station.
And the UE limits the position of a subframe executed by downlink signal quality measurement corresponding to wireless link monitoring according to the information provided by the base station, or performs post-processing on the measurement result to obtain a more reliable wireless link monitoring result. Specifically, there may be 3 implementation methods as follows:
example 1:
and the UE only carries out measurement at the position indicated as the small interference subframe and carries out wireless link monitoring according to the measurement result.
Example 2:
the UE measures at the positions indicated as the large interference subframe and the small interference subframe, for example, selects a certain number of large interference subframes and small interference subframes respectively within a certain time, and smoothes the measurement result of each subframe, for example, performs radio link monitoring according to the smoothed result by using a linear average or weighted average method.
Example 3:
and the UE only carries out measurement on the scheduled subframe and carries out wireless link monitoring according to the measurement result.
Referring to fig. 3, an apparatus for monitoring a radio link on a network side according to an embodiment of the present invention includes: a judging unit 31 and a transmitting unit 32.
A judging unit 31 for determining subframe interference level information;
a sending unit 32, configured to notify the terminal of the subframe interference level information, where the subframe interference level information is used for providing the terminal with radio link monitoring.
The subframe interference level information is interference level information of each subframe, or indication information of a possible large interference subframe set, or indication information of a possible small interference subframe set, wherein the possible large interference subframe is a subframe of which the interference intensity exceeds a set threshold; the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value. The subframe interference level information is explicit information or implicit information.
If the subframe interference level information is possible large interference subframe information, the determining unit 31 is configured to determine a possible large interference subframe according to a set interference coordination algorithm; or periodically counting the wireless channel quality information of each subframe reported by the central terminal, and judging the subframe of which the counting result of the wireless channel quality information meets a specific condition as a large-interference subframe; or counting the wireless channel quality information of each subframe reported by all the terminals, and judging the subframe of which the statistical result of the wireless channel quality information meets a specific condition as a large-interference subframe.
The sending unit 32 is configured to notify the subframe interference level information to a terminal served by the base station in a system broadcast, RRC dedicated signaling, MAC dedicated signaling, or physical layer dedicated signaling manner.
Referring to fig. 4, an apparatus for monitoring a wireless link at a terminal side according to an embodiment of the present invention includes: an acquisition unit 41 and a processing unit 42.
An obtaining unit 41, configured to obtain subframe interference level information determined by a base station;
and the processing unit 42 is configured to perform radio link monitoring according to the subframe interference level information.
The subframe interference level information is interference level information of each subframe, or indication information of a possible large interference subframe set, or indication information of a possible small interference subframe set,
the possible large interference subframes are subframes with interference intensity exceeding a set threshold;
the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
The obtaining unit 41 is configured to obtain subframe interference level information determined by the base station from the received system broadcast, RRC dedicated signaling, MAC dedicated signaling, or physical layer dedicated signaling.
The subframe interference level information is explicit information or implicit information.
The processing unit 42 is configured to determine a small interference subframe according to the subframe interference level information, perform measurement at the determined position of the small interference subframe, and perform wireless link monitoring according to the measurement result; or, determining the position of the large interference subframe and the position of the small interference subframe according to the subframe interference level information, respectively measuring the position of the large interference subframe and the position of the small interference subframe, smoothing the measurement result of each subframe, and monitoring the wireless link according to the smoothed result.
Of course, the processing unit 42 may also perform measurement on the scheduled subframe and perform radio link monitoring according to the measurement result.
The system for monitoring the wireless link of the embodiment of the invention comprises: a base station and a terminal. Wherein,
a base station for determining subframe interference level information; informing the terminal of the information of the possible large interference subframes;
the terminal is used for obtaining the subframe interference level information determined by the base station; and monitoring a wireless link according to the subframe interference level information.
In this system, the base station and the terminal may interact according to the embodiments in fig. 1 and fig. 2, which are not described herein again.
In this embodiment, the base station determines the subframe interference level information; and informing the terminal of the subframe interference level information, wherein the subframe interference level information is used for providing the terminal for wireless link monitoring. The embodiment of the invention can improve the monitoring reliability of the UE wireless link when the quality of the wireless link on different time domain resources has larger difference.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (21)
1. A method of radio link monitoring, the method comprising the steps of:
the base station determines subframe interference level information;
and the base station informs the terminal of the subframe interference level information, and the subframe interference level information is used for providing the terminal for wireless link monitoring.
2. The method according to claim 1, characterized in that the subframe interference level information is interference level information per subframe, or is indication information of a set of possible large interference subframes, or is indication information of a set of possible small interference subframes,
the possible large interference subframes are subframes with interference intensity exceeding a set threshold;
the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
3. The method of claim 2, wherein if the subframe interference level information is possible large interference subframe information, the base station determines the subframe interference level information, and comprises:
the base station determines a possible large interference subframe through a set interference coordination algorithm; or,
the base station periodically counts the wireless channel quality information of each subframe reported by the central terminal, and determines the subframe of which the statistical result of the wireless channel quality information meets a specific condition as a possible large-interference subframe; or,
the base station periodically counts the wireless channel quality information of each subframe reported by all the terminals, and determines the subframe of which the statistical result of the wireless channel quality information meets a specific condition as a possible large-interference subframe.
4. The method of claim 1, wherein the base station informs the terminal of the subframe interference level information, and wherein the method comprises:
and the base station informs the terminal served by the base station of the subframe interference level information in a system broadcast mode, a radio resource control protocol (RRC) special signaling mode, a Media Access Control (MAC) special signaling mode or a physical layer special signaling mode.
5. The method of claim 1, wherein the subframe interference level information is explicit information or implicit information.
6. A method of radio link monitoring, the method comprising the steps of:
a terminal obtains subframe interference level information determined by a base station;
and the terminal monitors the wireless link according to the subframe interference level information.
7. The method according to claim 6, characterized in that the subframe interference level information is interference level information per subframe, or is indication information of a set of possible large interference subframes, or is indication information of a set of possible small interference subframes,
the possible large interference subframes are subframes with interference intensity exceeding a set threshold;
the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
8. The method of claim 7, wherein the obtaining, by the terminal, the subframe interference level information frame determined by the base station comprises:
the terminal obtains the subframe interference level information determined by the base station from the received system broadcast, the radio resource control protocol RRC dedicated signaling, the media access control MAC dedicated signaling or the physical layer dedicated signaling.
9. The method of claim 7, wherein the subframe interference level information is explicit information or implicit information.
10. The method of claim 7, wherein the terminal performs radio link monitoring according to the subframe interference level information, and comprises:
the terminal determines a small interference subframe according to the subframe interference level information, measures the position of the determined small interference subframe, and monitors a wireless link according to the measurement result; or,
and the terminal determines the position of a large interference subframe and the position of a small interference subframe according to the subframe interference level information, measures the positions of the large interference subframe and the small interference subframe respectively, smoothes the measurement result of each subframe, and monitors a wireless link according to the smoothed result.
11. An apparatus for wireless link monitoring, the apparatus comprising:
a judging unit for determining subframe interference level information;
and the sending unit is used for informing the terminal of the subframe interference level information, and the subframe interference level information is used for providing the terminal for wireless link monitoring.
12. The apparatus of claim 11, wherein the subframe interference level information is interference level information of each subframe, or indication information of a possible large interference subframe set, or indication information of a possible small interference subframe set,
the possible large interference subframes are subframes with interference intensity exceeding a set threshold;
the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
13. The apparatus of claim 12, wherein if the subframe interference level information is possible high interference subframe information,
the judging unit is used for determining a possible large interference subframe through a set interference coordination algorithm; or periodically counting the wireless channel quality information of each subframe reported by the central terminal, and judging the subframe of which the counting result of the wireless channel quality information meets a specific condition as a large-interference subframe; or counting the wireless channel quality information of each subframe reported by all the terminals, and judging the subframe of which the statistical result of the wireless channel quality information meets a specific condition as a large-interference subframe.
14. The apparatus of claim 11, wherein the transmitting unit is configured to notify the subframe interference level information to a terminal served by the base station through system broadcast, RRC dedicated signaling, MAC dedicated signaling, or physical layer dedicated signaling.
15. The apparatus of claim 12, wherein the subframe interference level information is explicit information or implicit information.
16. An apparatus for wireless link monitoring, the apparatus comprising:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring subframe interference level information determined by a base station;
and the processing unit is used for monitoring the wireless link according to the subframe interference level information.
17. The apparatus of claim 16, wherein the subframe interference level information is interference level information for each subframe, or indication information for a set of possible large interference subframes, or indication information for a set of possible small interference subframes,
the possible large interference subframes are subframes with interference intensity exceeding a set threshold;
the possible small interference subframes are subframes of which the interference strength does not exceed a set threshold value.
18. The apparatus of claim 16, wherein the obtaining unit is configured to obtain the subframe interference level information determined by the base station from the received system broadcast, RRC dedicated signaling, MAC dedicated signaling, or physical layer dedicated signaling.
19. The apparatus of claim 17, wherein the subframe interference level information is explicit information or implicit information.
20. The apparatus of claim 17, wherein the processing unit is configured to determine a small interference subframe according to the subframe interference level information, perform measurement at a position of the determined small interference subframe, and perform radio link monitoring according to a measurement result; or, determining the position of the large interference subframe and the position of the small interference subframe according to the subframe interference level information, respectively measuring the position of the large interference subframe and the position of the small interference subframe, smoothing the measurement result of each subframe, and monitoring the wireless link according to the smoothed result.
21. A system for wireless link monitoring, the system comprising:
a base station for determining subframe interference level information; informing the terminal of the information of the possible large interference subframes;
the terminal is used for obtaining the subframe interference level information determined by the base station; and monitoring a wireless link according to the subframe interference level information.
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| CN104519579A (en) * | 2013-09-27 | 2015-04-15 | 上海贝尔股份有限公司 | Operating and signal-generating methods, devices and systems based on sub-frame sets |
| CN107770808A (en) * | 2016-08-19 | 2018-03-06 | 北京信威通信技术股份有限公司 | A kind of anti-disturbance method and device |
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| US20080130526A1 (en) * | 2006-11-30 | 2008-06-05 | Nokia Corporation | Apparatus, method and computer program product providing LCR-TDD compatible frame structure |
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| CN104519579B (en) * | 2013-09-27 | 2019-06-18 | 上海诺基亚贝尔股份有限公司 | Operation and signaling generation method, device and system based on sub-frame set |
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