CN109429259B - Downlink channel quality reporting method and user terminal - Google Patents
Downlink channel quality reporting method and user terminal Download PDFInfo
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- CN109429259B CN109429259B CN201710720352.8A CN201710720352A CN109429259B CN 109429259 B CN109429259 B CN 109429259B CN 201710720352 A CN201710720352 A CN 201710720352A CN 109429259 B CN109429259 B CN 109429259B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Abstract
The invention provides a downlink channel quality reporting method and a user terminal. The method comprises the following steps: mapping the SINR measurement value of the downlink reference signal to a CQI index value after the triggering of the CQI report; and assembling a CQI MAC control unit in the MAC PDU of the uplink resource based on the CQI index value so as to report the quality of the downlink channel to the network side. The invention provides a downlink channel quality reporting method, which aims at the single subband working requirement of a TD-LTE230 system, represents the downlink channel quality through a downlink SINR measured value, and triggers the reporting of downlink channel quality information through an MAC layer. The invention designs a CQI MAC control unit, and the terminal maps the downlink SINR measured value into a CQI index value which is borne in the uplink MAC PDU and reported to the network side.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a downlink channel quality reporting method and a user terminal.
Background
In a broadband access system based on the TD-LTE technology, the available bandwidth of the system is divided into a plurality of continuous or discontinuous sub-bands, and each sub-band is transmitted by adopting the Orthogonal Frequency Division Multiplexing (OFDM) technology. The sub-band is divided into a synchronous sub-band, a broadcast sub-band and a service sub-band according to functions. The synchronous sub-band is used for sending downlink synchronous signals, the broadcast sub-band is used for downlink broadcast and uplink random access, and the service sub-band is used for transmitting services. In order to reduce the cost of the terminal, the system supports a single subband operation mode, and each physical channel must be independently transmitted on each subband. The terminal works on all or part of sub-bands according to different selections of hardware capabilities, and the terminal with the weakest capability only works on a single sub-band. A typical application scenario is a power system wireless broadband access network, referred to as TD-LTE230 network for short, where frequency spectrums are discretely distributed in a 230MHz frequency band, each sub-band is 25kHz, and a schematic diagram of frequency resource distribution is shown in fig. 1.
The TD-LTE230 network requires to support deep coverage, and in order to improve the transmission performance of each physical channel, a repetitive transmission mode is adopted in the time domain, and a periodic transmission mode is adopted to obtain a time diversity gain. Therefore, the timing relationship of data transmission is as follows: in one PDCCH period, the PDCCH sends uplink authorization information to schedule a PUSCH and/or downlink authorization information to schedule a PDSCH, and the transmission time of the PDCCH depends on the maximum repetition times of the PDCCH configured by RRC message and the repetition times of the PDCCH configured by uplink authorization and/or downlink authorization; after the last repeated transmission of the PDCCH is finished, the next radio frame starts to transmit the PUSCH and/or the PDSCH, the PUSCH transmission time depends on the number of the radio frames occupied by the transmission blocks configured by the uplink authorization and the number of repeated times, and the PDSCH transmission time depends on the number of the radio frames occupied by the transmission blocks configured by the downlink authorization and the number of repeated times; the feedback information of the uplink transmission block is indicated by NDI in uplink authorization information of a next PDCCH period spaced by one PDCCH period, the feedback information of the downlink transmission block is carried by PUCCH which starts to be transmitted by a next radio frame after the last repeated transmission of PDSCH is finished, the PUCCH occupies all uplink subframes of one radio frame, when the PDSCH transmission time is more than 16 radio frames, the PUCCH occupies 2 radio frames, otherwise, 1 radio frame is occupied.
In the existing LTE system, the PUCCH bearer content includes a scheduling request SR, downlink HARQ feedback information ACK/NACK, and downlink channel quality indication CSI (including information such as CQI, PMI, RI, and the like). In the TD-LTE230 system, a single subband working mode is supported, a PUCCH channel is simplified, and only used for carrying feedback information of a PDSCH transport block, and new reporting mechanisms need to be defined for downlink channel quality information.
Disclosure of Invention
The present invention provides a downlink channel quality reporting method and a user terminal that overcome the above problems or at least partially solve the above problems.
According to an aspect of the present invention, a method for reporting downlink channel quality is provided, including:
mapping the SINR measurement value of the downlink reference signal to a CQI index value after the triggering of the CQI report;
and assembling a CQI MAC control unit in the MAC PDU of the uplink resource based on the CQI index value so as to report the quality of the downlink channel to the network side.
Further, mapping the SINR measurement value of the downlink reference signal to a CQI index value after the CQI report is triggered, further includes:
after triggering of a CQI report, measuring an SINR value of the downlink reference signal to obtain a current SINR measured value;
and mapping the current SINR measurement value to a CQI index value.
Further, mapping the current SINR measurement value to a CQI index value, further comprising:
setting a CQI value interval as [ M, N ] and a value step as K, wherein M, N and K are integers, and the number of CQI index values is a positive value of (N-M)/K;
classifying the SINR measured values according to the number of the CQI index values to obtain classification grades of different SINR measured values;
and acquiring a current CQI index value based on the classification level of the current SINR measured value.
Further, the assembling a CQI MAC control unit in the MAC PDU of the uplink resource based on the CQI index value to report the downlink channel quality to the network side further includes:
if the uplink resource can contain the CQI MAC control unit in the process of the priority processing of the logical channel, the CQI MAC control unit is packaged according to the CQI index value;
and the CQI MAC control unit is assembled in the MAC PDU and then reported, and the CQI MAC control unit is identified by a logical channel ID.
Specifically, the length of the CQI MAC control element is 2 bytes, and includes LCID, P/C, Type, R, and CQI fields;
the LCID is used for indicating a logical channel ID, and the field length is 3 bits; wherein 101 denotes a PHR/CQI MAC CE.
The P/C is used for indicating whether PHR or CQI, and the field length is 2 bits; where 00 denotes PHR and 01 denotes CQI.
The Type is used for identifying the PHR Type when the P/C field indicates the PHR, and the field length is 2 bits.
And the R is a reserved bit, and the length of the field is 3 bits.
The CQI is used for indicating the SINR measured value of the downlink channel, and the field length is 6 bits.
Further, the CQI reporting trigger includes: the CQI timer expires;
after the CQI control unit is assembled in the MAC PDU of the uplink resource, the method further comprises the following steps: the CQI timer is started or restarted.
Further, the CQI timer is positioned at the MAC layer of the user terminal; and the user terminal configures the CQI timer according to the RRC signaling sent by the base station.
Further, the method for reporting the downlink channel quality further comprises the following steps: and if the uplink resource does not exist, sending an SR request to the network side to acquire the uplink resource.
According to another aspect of the present invention, there is also provided a user terminal, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method for reporting the downlink channel quality and the method of any optional embodiment of the method for reporting the downlink channel quality of the embodiments of the present invention.
According to another aspect of the present invention, a non-transitory computer-readable storage medium is provided, which stores computer instructions, where the computer instructions cause the computer to execute a method for reporting downlink channel quality and all the optional embodiments thereof according to an embodiment of the present invention.
The embodiment of the invention provides a downlink channel quality reporting method, which aims at the single subband working requirement of a TD-LTE230 system, represents the downlink channel quality through a downlink SINR measured value, and triggers the reporting of downlink channel quality information through an MAC layer. The embodiment of the invention designs a CQI MAC control unit, and the terminal maps the downlink SINR measured value into a CQI index value which is borne in the uplink MAC PDU and reported to the network side.
Drawings
Fig. 1 is a schematic diagram of frequency resource distribution of a TD-LTE230 network according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for reporting downlink channel quality according to an embodiment of the present invention;
FIG. 3 is a diagram of a CQI MAC control unit according to an embodiment of the present invention;
fig. 4 is a block diagram of a user terminal according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 2, an embodiment of the present invention provides a method for reporting quality of a downlink channel, including:
s100, mapping the SINR measurement value of the downlink reference signal into a CQI index value after triggering of the CQI report;
in the embodiment of the invention, the downlink channel quality report needs certain conditions to be triggered. Different systems may have different trigger condition devices, which is not limited in the embodiment of the present invention. Specifically, the triggering of the downlink channel quality reporting mechanism in the embodiment of the present invention is at the MAC layer of the user equipment.
Optionally, the CQI report trigger includes: CQI timer CQI-reportperiod times out. Specifically, the CQI timer is located in the MAC layer of the user equipment. And the user terminal configures the CQI timer according to the RRC signaling sent by the base station.
The embodiment of the invention takes the SINR (signal to noise ratio) measured value of the downlink reference signal as the index of the downlink channel quality, maps the SINR measured value into a CQI value and reports the CQI value to the base station.
S101, based on the CQI index value, assembling a CQI MAC control unit in the MAC PDU of the uplink resource so as to report the quality of the downlink channel to the network side.
If uplink resources exist, the CQI value mapped by the SINR measured value is assembled into a CQI MAC control unit, and is packaged in the MAC PDU of the uplink resources to be sent to the base station.
The embodiment of the invention provides a downlink channel quality reporting method, which aims at the single subband working requirement of a TD-LTE230 system, represents the downlink channel quality through a downlink SINR measured value, and triggers the reporting of downlink channel quality information through an MAC layer. The embodiment of the invention designs a CQI MAC control unit, and the terminal maps the downlink SINR measured value into a CQI index value which is borne in the uplink MAC PDU and reported to the network side.
In an optional embodiment, the method for reporting downlink channel quality further includes: and if the uplink resource does not exist, sending an SR request to the network side to acquire the uplink resource. After the uplink resource is acquired, a CQI MAC control unit is assembled in the MAC PDU of the uplink resource according to step S101 to report the quality of the downlink channel to the network side.
In an optional embodiment, in S100, the mapping, after the CQI report is triggered, the SINR measurement value of the downlink reference signal to a CQI index value further includes:
after triggering of a CQI report, measuring an SINR value of the downlink reference signal to obtain a current SINR measured value; and mapping the current SINR measurement value to a CQI index value.
In an optional embodiment, mapping the current SINR measurement value to a CQI index value further includes:
setting a CQI value interval as [ M, N ] and a value step as K, wherein M, N and K are integers, and the number of CQI index values is a positive value of (N-M)/K;
classifying the SINR measured values according to the number of the CQI index values to obtain classification grades of different SINR measured values;
and acquiring a current CQI index value based on the classification level of the current SINR measured value.
In the embodiment of the invention, the value interval is limited for the CQI for configuring the byte length of the CQI MAC control unit, and under the condition that the value stepping length is fixed, the value interval is fixed, so that the number of CQI index values is also determined.
In a specific embodiment, the number of CQI index values is 45 assuming that the CQI span is [ -15, 30] dB and the value is stepped to 1 dB. The user terminal may divide the SINR value into 45 classes according to the SINR measurement value of the downlink channel in the historical period or the SINR measurement value of a certain time period, where each class corresponds to one CQI index. Then the corresponding current CQI index value can be obtained according to the level corresponding to the current SINR measurement value of the downlink channel.
In an optional embodiment, the assembling, in S101, a CQI MAC control unit in a MAC PDU of an uplink resource based on the CQI index value to report downlink channel quality to a network side further includes:
if the uplink resource can contain the CQI MAC control unit in the process of the priority processing of the logical channel, the CQI MAC control unit is packaged according to the CQI index value;
and the CQI MAC control unit is assembled in the MAC PDU and then reported, and the CQI MAC control unit is identified by a logical channel ID.
Corresponding to the CQI triggering of the foregoing embodiment, after the assembling the CQI control unit in the MAC PDU of the uplink resource, the method further includes: the CQI timer CQI-reportperiod is started or restarted.
As shown in fig. 3, in an alternative embodiment, the CQI MAC control element has a length of 2 bytes, and includes LCID, P/C, Type, R and CQI fields;
the LCID is used for indicating a logical channel ID, and the field length is 3 bits; wherein 101 denotes a PHR/CQI MAC CE.
The P/C is used for indicating whether PHR or CQI, and the field length is 2 bits; where 00 denotes PHR and 01 denotes CQI.
The Type is used for identifying the PHR Type when the P/C field indicates the PHR, and the field length is 2 bits.
And the R is a reserved bit, and the length of the field is 3 bits.
The CQI is used for indicating the SINR measured value of the downlink channel, and the field length is 6 bits.
In summary, the embodiments of the present invention define a downlink channel quality reporting mechanism triggered by the MAC layer and a CQI MAC control unit format, so as to provide a downlink channel quality reporting method, which characterizes downlink channel quality by a downlink SINR measurement value according to a single subband working requirement of the TD-LTE230 system, and triggers downlink channel quality information reporting by the MAC layer. In the embodiment of the invention, the user terminal maps the downlink SINR measured value into the CQI index value, and the CQI MAC control unit loads the CQI index value in the uplink MAC PDU and reports the CQI index value to the network side.
Fig. 4 shows a block diagram of a user terminal according to an embodiment of the present invention.
Referring to fig. 4, the user terminal includes: a processor (processor)501, a memory (memory)502, and a bus 503;
wherein, the processor 501 and the memory 502 complete the communication with each other through the bus 503;
the processor 501 is configured to call program instructions in the memory 502 to perform the methods provided by the above-mentioned method embodiments, for example, including: mapping the SINR measurement value of the downlink reference signal to a CQI index value after the triggering of the CQI report; and based on the CQI index value, assembling a CQI MAC control unit in the MAC PDU of the uplink resource to report the downlink channel quality to the network side.
Another embodiment of the present invention discloses a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including: mapping the SINR measurement value of the downlink reference signal to a CQI index value after the triggering of the CQI report; and based on the CQI index value, assembling a CQI MAC control unit in the MAC PDU of the uplink resource to report the downlink channel quality to the network side.
Another embodiment of the invention provides a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform a method provided by the above method embodiments, for example, comprising: mapping the SINR measurement value of the downlink reference signal to a CQI index value after the triggering of the CQI report; and based on the CQI index value, assembling a CQI MAC control unit in the MAC PDU of the uplink resource to report the downlink channel quality to the network side.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of a user terminal and the like are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple 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, the method of the present application is only a preferred embodiment 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 (9)
1. A method for reporting downlink channel quality is characterized by comprising the following steps:
in the TD-LTE230 network, mapping an SINR measurement value of a downlink reference signal into a CQI index value after triggering a CQI report;
based on the CQI index value, if the uplink resource exists, assembling a CQIMAC control unit in the MAC PDU of the uplink resource to report the quality of the downlink channel to the network side;
if the uplink resource does not exist, an SR request is sent to the network side to acquire the uplink resource, and after the uplink resource is acquired, a CQIMAC control unit is assembled in the MAC PDU of the uplink resource to report the quality of a downlink channel to the network side;
the length of the CQIMAC control unit is 2 bytes, and the CQIMAC control unit comprises LCID, P/C, Type, R and CQI fields;
the LCID is used for indicating a logical channel ID, and the field length is 3 bits;
the P/C is used for indicating whether PHR or CQI, and the field length is 2 bits;
the Type is used for identifying the PHR Type when the P/C field indicates the PHR, and the field length is 2 bits;
the R is a reserved bit, and the length of the field is 3 bits;
the CQI is used for indicating the SINR measured value of the downlink channel, and the field length is 6 bits.
2. The method of claim 1, wherein the mapping the SINR measurement value of the downlink reference signal to a CQI index value after the CQI report is triggered further comprises:
after triggering of a CQI report, measuring an SINR value of the downlink reference signal to obtain a current SINR measured value;
and mapping the current SINR measurement value to a CQI index value.
3. The method of claim 2, wherein mapping the current SINR measurement value to a CQI index value, further comprises:
setting a CQI value interval as [ M, N ] and a value step as K, wherein M, N and K are integers, and the number of CQI index values is a positive value of (N-M)/K;
classifying the SINR measured values according to the number of the CQI index values to obtain classification grades of different SINR measured values;
and acquiring a current CQI index value based on the classification level of the current SINR measured value.
4. The method according to any of claims 1-3, wherein the assembling a CQIMAC control element in the MAC PDU of the uplink resource based on the CQI index value to report the downlink channel quality to the network side further comprises:
if the uplink resource can contain the CQIMAC control unit in the process of logic channel priority processing, the CQIMAC control unit is packaged according to the CQI index value;
and the CQIMAC control unit is assembled in the MAC PDU and then reported, and the CQI MAC control unit is identified by a logical channel ID.
5. The method of claim 1, wherein the CQI reporting trigger comprises: the CQI timer expires;
after the CQI control unit is assembled in the MAC PDU of the uplink resource, the method further comprises the following steps: the CQI timer is started or restarted.
6. The method of claim 5, wherein the CQI timer is located at a MAC layer of a user terminal; and the user terminal configures the CQI timer according to the RRC signaling sent by the base station.
7. The method of claim 1, further comprising, if there is no uplink resource, sending an SR request to a network side to obtain the uplink resource.
8. A user terminal, comprising:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 7.
9. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 7.
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| CN111294151B (en) * | 2019-07-05 | 2023-07-25 | 展讯通信（上海）有限公司 | Channel quality reporting method, base station, user equipment and readable storage medium |
| WO2021007809A1 (en) * | 2019-07-17 | 2021-01-21 | 华为技术有限公司 | Channel quality reporting method, device and system |
| EP4037430B1 (en) * | 2019-11-06 | 2023-09-13 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Channel quality feedback method and apparatus |
| CN114143725A (en) * | 2021-12-13 | 2022-03-04 | 中信科移动通信技术股份有限公司 | Broadband cluster call processing method and system |
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| CN105024784A (en) * | 2015-07-23 | 2015-11-04 | 大唐移动通信设备有限公司 | Method and device for CQI report and control method and device for CQI report |
| CN105191194A (en) * | 2013-03-22 | 2015-12-23 | 富士通株式会社 | Channel quality indicator configuration method and modulation and coding scheme configuration method and apparatus |
| CN105850066A (en) * | 2013-12-27 | 2016-08-10 | Lg电子株式会社 | Method and apparatus for reporting channel state information |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105191194A (en) * | 2013-03-22 | 2015-12-23 | 富士通株式会社 | Channel quality indicator configuration method and modulation and coding scheme configuration method and apparatus |
| CN105850066A (en) * | 2013-12-27 | 2016-08-10 | Lg电子株式会社 | Method and apparatus for reporting channel state information |
| CN105024784A (en) * | 2015-07-23 | 2015-11-04 | 大唐移动通信设备有限公司 | Method and device for CQI report and control method and device for CQI report |
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