CN111954246B - Downlink evaluation method, base station and equipment - Google Patents
Downlink evaluation method, base station and equipment Download PDFInfo
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- CN111954246B CN111954246B CN201910415449.7A CN201910415449A CN111954246B CN 111954246 B CN111954246 B CN 111954246B CN 201910415449 A CN201910415449 A CN 201910415449A CN 111954246 B CN111954246 B CN 111954246B
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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
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the invention relates to the technical field of narrowband internet of things communication and discloses a downlink evaluation method, which comprises the following steps: acquiring the transmitting power of a base station; acquiring uplink channel loss; and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss. By the method, the testing efficiency and the testing precision of the downlink are greatly improved, the break-over of protocols is broken through, and the network evaluation efficiency is greatly improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of narrowband internet of things communication, in particular to a downlink evaluation method, a base station and equipment.
Background
Narrowband internet of things (Narrow Band Internet of Things, NB-IoT) is an emerging technology in the IoT field that supports cellular data connectivity of low power devices over a wide area network, also known as a Low Power Wide Area Network (LPWAN). NB-IoT supports efficient connections for long standby times, high demand devices for network connections. NB-IoT device battery life is said to be improved by at least 10 years while still providing very comprehensive indoor cellular data connection coverage.
The NB-LoT network evolves based on the existing LTE network, and borrows a lot of equipment and mechanisms in the existing LTE network, in the LTE network, a network side can evaluate the coverage quality of a downlink network by collecting and processing MR information reported by a terminal, compared with DT and CQT test methods (DT test, drive test, commonly called drive test; CQT test, callQualityTest, call quality dialing test, also referred to as testing the performance of a wireless data network at a fixed place), the method has the advantages that the evaluation of the downlink coverage by using the MR information reported by the terminal side is more comprehensive, and the network optimization reference value is higher.
In the research process, the inventor discovers that the prior NB-IoT network protocol prescribes that the terminal does not report MR data, so that the downlink coverage evaluation can only adopt the traditional DT and CQT test methods, namely software analysis test is used for counting the relevant indexes of the downlink coverage, such as coverage rate, average RSRP and the like. When evaluating the downlink quality of the NB-IoT network, particularly in a deep coverage scene, the problems of high test cost and incomplete evaluation exist.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a downlink evaluation method, a base station, and an apparatus, which overcome or at least partially solve the above-described problems.
According to an aspect of an embodiment of the present invention, there is provided a downlink evaluation method, including:
acquiring the transmitting power of a base station;
acquiring uplink channel loss;
and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss.
Optionally, the acquiring the base station transmitting power specifically includes:
acquiring downlink narrowband reference signal transmitting power P NRS 。
Optionally, the acquiring uplink channel loss includes:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is less than or equal to 2, calculating the uplink channel loss PL UL The method comprises the following steps:
Optionally, the acquiring uplink channel loss of the base station includes:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2, calculating the uplink channel loss PL UL The method comprises the following steps:
calculating average received power P' (t) of the narrowband physical uplink shared channel NPUSCH:
P'(t)＝P PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported for PHY, N RX The number of the uplink receiving antennas;
PL UL ＝P TX -P' (t), where P TX Maximum transmit power P for a user terminal MAX 。
Optionally, the method further comprises: the base station inquires the user terminal capability table to obtain the maximum transmitting power P of the user terminal MAX 。
Optionally, the P TX ＝23dBm。
Optionally, the downlink evaluation is performed according to the base station transmitting power and the uplink channel loss, specifically:
calculating Reference Signal Received Power (RSRP):
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
Optionally, the downlink evaluation is performed according to the base station transmitting power and the uplink channel loss, specifically:
calculating the reference signal received power RSRP:
RSRP＝P NRS -(P TX -P'(t))；
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
According to another aspect of an embodiment of the present invention, there is provided a base station including: a transceiver and a processor;
the transceiver: the method comprises the steps of receiving a signal sent by a terminal and sending a reference signal to the terminal;
the processor: and the method is used for acquiring the transmitting power of the base station, calculating the uplink channel loss, and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss.
According to another aspect of the embodiments of the present invention, there is provided a downlink evaluation apparatus including: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus;
the memory is configured to store at least one executable instruction that causes the processor to perform the downlink evaluation method provided in the method embodiment described above.
According to yet another aspect of the embodiments of the present invention, there is provided a computer storage medium having stored therein at least one executable instruction for causing a processor to perform the downlink evaluation method provided in the above-described method embodiment.
The downlink evaluation method provided by the embodiment of the invention evaluates the downlink loss by calculating the uplink loss, evaluates the uplink loss by means of PHR reported by the terminal through the technical scheme of evaluating the downlink coverage based on the link symmetry, greatly improves the testing efficiency and the testing precision of the downlink, breaks through the protocol, and greatly improves the network evaluation efficiency.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present invention can be more clearly understood, and the following specific embodiments of the present invention are given for clarity and understanding.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 illustrates an NB-IoT network signaling interaction diagram in accordance with an embodiment of the present invention;
fig. 2 is a flowchart of a downlink evaluation method according to an embodiment of the present invention;
FIG. 3 illustrates a PHR message structure diagram provided by an embodiment of the invention;
fig. 4 shows a schematic structural diagram of a base station device according to an embodiment of the present invention;
fig. 5 shows a block diagram of a downlink evaluation apparatus provided by an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows an NB-IoT network signaling interaction diagram of an embodiment of the present invention, describing the implementation environment of the embodiment of the present invention, as shown in fig. 1:
in the random access process, the UE firstly sends an RA Preamble to the eNB, and if the RA Preamble is captured by the eNB, the eNB sends a reply message RA Response to the UE, wherein the reply message comprises the C-RNTI, the TA and the uplink authorized resource. After receiving the RA Response, the UE sends Msg3, i.e. rrcconnectionrequest message, to the eNB through the narrowband physical uplink shared channel NPUSCH, where the message includes UE identity and RRC establishment cause. In the random access flow based on competition, the Msg3 carries CCCH signaling and DVI/PHR, and the scrambling code of the PUSCH carried by the Msg3 is generated by the Temp C-RNTI. CCCH carried in Msg3 varies according to scene: the initial access bearer RRCConnectionRequest, RRC carries the RRCConnectionResumeRequest at recovery. If the eNB successfully receives the RRC message, an Msg4 message, namely RRCConnection setup, will be sent to the UE. After receiving the Msg3 message, the UE sends an Msg5 message to the eNB, including an RRC connection setup complete message rrcconnectionsetup complete, and also including a NAS message, such as a Service Request message, etc., so as to complete the entire random access procedure.
As shown in fig. 2, a downlink evaluation method according to an embodiment of the present invention is provided, where the core idea of the embodiment of the present invention is to estimate downlink path loss based on uplink path loss, and the base station eNB calculates uplink path loss according to the received power of MSG3 at the base station side and the transmit power at the terminal side when the UE is accessed, and further, uses the symmetry of uplink and downlink, and uses NRS transmit power to remove the approximately estimated uplink path loss, and further calculates the received power RSRP of the downlink reference signal received by the UE.
Step 101: acquiring the transmitting power of a base station;
the method comprises the steps of obtaining downlink transmitting power of a base station, wherein a narrow-band reference signal NRS is a physical layer signal and is mainly used for downlink channel modulation, RSRP measurement and the like, and in the embodiment of the invention, the P of NRS signal power transmitted by the base station is obtained NRS The downlink channel estimation is performed as the base station transmit power.
102: acquiring uplink channel loss;
the accuracy of the loss estimation of the uplink channel is affected by the accuracy of the power measurement of the uplink received signal, including the coverage area, and when the uplink signal is weak to a certain extent, the accuracy of the signal function measurement is reduced in a nonlinear manner. From the simulation results, the lowest signal-to-noise ratio for the 3.75K measurement accuracy interval is relatively low, so the 3.75K approach is recommended at far coverage. Meanwhile, the uplink signal receiving power measurement is also influenced by the RU number and the repetition number of the NPUSCH, and is essentially the measurement of the pilot frequency of the NPUSCH, so that the more the RU number and the more the repetition number, the more accurate the measurement.
Therefore, when acquiring uplink signal loss, it is necessary to distinguish between the following two cases:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is less than or equal to 2:
the uplink of the terminal adopts an open loop power control mode, and the transmitting power is calculated as follows:
P NPUSCH ＝min{P MAX ,10log10(M NPUSCH )+P O_NPUSCH +α*PL}
wherein:
-M NPUSCH bandwidth representing NPUSCH resource allocation: {1/4,1,3,6,12} (reflecting uplink transmission resource bandwidth);
-P O_NPUSCH the larger the value of the expected received power sent by the UE, the larger the uplink throughput and edge coverage, but if the value is set too large, inter-cell interference will be caused;
- α is a path loss compensation factor, and the parameter is used to compensate the path loss of the cell when calculating the NPUSCH transmit power, and when α=1, the UE transmit power is calculated as a full path loss compensation, and α <1, the UE transmit power is calculated as a partial path loss compensation;
PL is the downlink loss estimated by the UE.
At this time, the terminal transmitting power or PL (path loss) cannot be directly obtained, and the path loss is estimated according to the PH level reported by the terminal in Msg 3. The UE includes PHR information in the Msg3 message, where PHR is 2 bits, as shown in fig. 3.
The pH is rated in four ways as shown in the following Table:
TABLE 1
| PH grade | Power Headroom Level (Power headroom grade) |
| 0 | POWER_HEADROOM_0 |
| 1 | POWER_HEADROOM_1 |
| 2 | |
| 3 | POWER_HEADROOM_3 |
In normal coverage, its corresponding dB value is defined as shown in the following table:
TABLE 2
In enhanced coverage (CEL 1 and CEL 2), the dB values mapped are shown in the following table:
TABLE 3 Table 3
| Reported level | Measured quantity value(dB) | PH value |
| POWER_HEADROOM_0 | -23≤PH<-10 | -16 |
| POWER_HEADROOM_1 | -10≤PH<-2 | -6 |
| POWER_HEADROOM_2 | -2≤PH<6 | 2 |
| POWER_HEADROOM_3 | PH>＝6 | 6 |
The PH level reported by the terminal corresponds to a PH range. When estimating the path loss by using the PH, a PH value is assigned to each PH range to perform the path loss estimation. Therefore, the eNB can know the corresponding PH according to the PHR reported by the terminal.
Therefore, its uplink loss is:
wherein:
-p0_npusch is a value configured on the eNB for the desired received power;
-an α -path loss compensation factor configured on the eNB;
-P MAX the maximum transmitting power reported by the terminal is obtained from the terminal side;
the PH is a power headroom PH value obtained from the PH level reported by the terminal.
When the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2:
the terminal transmits with maximum power (three types of 23dB/20dB/14 dB), the maximum transmitting power of the terminal is obtained through UE capability inquiry, eNB sends a ServiceRequest message to the core network, inquires the UE capability to the core network, and at the moment, the maximum transmitting power P of the user terminal is obtained TX ＝P MAX 。
Calculating the average received power P '(t), P' (t) =p of NPUSCH PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported by physical layer PHY, N RX The number of uplink receiving antennas.
Taking P' (t) as NPUSCH power received by eNB, namely P RX ＝P'(t)。
Uplink loss PL UL ＝P TX -P'(t)＝P MAX -(P PHY (t)-10*log 10 (N RX ))。
When the maximum transmitting power P of the terminal cannot be obtained MAX When the terminal is in the power mode, the maximum transmitting power P of the terminal is set MAX Set to 23dB.
It should be noted that, due to the influence of the maximum transmission power of the terminal, according to the protocol, the maximum transmission power of the terminal has three types of 23/20/14dB, and needs to be obtained through the capability query of the UE. Meanwhile, due to the influence of measurement fluctuation, certain error fluctuation exists in one-time measurement of the PHY layer, and the MAC layer averages the measurement results of a plurality of NPUSCH, so that the measurement accuracy can be improved.
103: and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss.
From step 102, an uplink loss PL can be obtained UL Downlink estimation is performed using uplink and downlink symmetry, and using uplink loss as downlink loss.
The transmitting power of the base station is P NRS Thus when the narrow band is physicallyWhen the retransmission times of the NPUSCH of the line sharing channel are less than or equal to 2:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2:
RSRP＝P NRS -(P TX -P'(t))＝P NRS -(P MAX -(P PHY (t)-10*log 10 (N RX )))。
therefore, the estimation of the downlink channel can be performed according to the RSRP value.
In summary, the downlink evaluation method provided by the embodiment of the invention evaluates the downlink loss by calculating the uplink loss, evaluates the uplink loss by means of PHR reported by the terminal through the technical scheme of evaluating the downlink coverage based on the link symmetry, greatly improves the testing efficiency and the testing precision of the downlink, breaks through the protocol, and greatly improves the network evaluation efficiency.
Another embodiment of the present invention also proposes a base station 400, as shown in fig. 4, comprising a transceiver 410 and a processor 420,
the transceiver 410: the method comprises the steps of receiving a signal sent by a terminal and sending a reference signal to the terminal;
the processor 420: and the method is used for acquiring the transmitting power of the base station, calculating the uplink channel loss, and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss.
Further, the processor 420 may also obtain the downlink narrowband reference signal transmit power P NRS 。
Further, the processor 420 may further obtain uplink channel loss, including:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is less than or equal to 2, calculating the uplink channel loss PL UL The method comprises the following steps:
Further, the processor 420 may further obtain uplink channel loss, including:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2, calculating the uplink channel loss PL UL The method comprises the following steps:
calculating average received power P' (t) of the narrowband physical uplink shared channel NPUSCH:
P'(t)＝P PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported for PHY, N RX The number of the uplink receiving antennas;
PL UL ＝P TX -P' (t), where P TX Maximum transmit power P for user terminal MAX 。
Further, the base transceiver station 410 may also query the ue capability table to obtain the maximum ue transmit power P MAX 。
Further, the processor 420 performs downlink evaluation according to the base station transmitting power and the uplink channel loss, specifically:
calculating Reference Signal Received Power (RSRP):
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
Further, the processor 420 performs downlink evaluation according to the base station transmitting power and the uplink channel loss, specifically:
calculating the reference signal received power RSRP:
RSRP＝P NRS -(P TX -P'(t))；
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
In summary, the base station provided by the embodiment of the invention estimates the downlink loss by calculating the uplink loss, estimates the uplink loss by means of PHR reported by the terminal through the technical scheme of estimating the downlink coverage based on the link symmetry, greatly improves the testing efficiency and the testing precision of the downlink, breaks through the protocol, and greatly improves the network evaluation efficiency.
Another embodiment of the present invention provides a non-transitory computer storage medium storing at least one executable instruction for performing the downlink evaluation method of any of the above-described method embodiments.
The executable instructions may be particularly useful for causing a processor to:
acquiring the transmitting power of a base station;
acquiring uplink channel loss;
and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss.
Optionally, the acquiring the base station transmitting power specifically includes:
acquiring downlink narrowband reference signal transmitting power P NRS 。
Optionally, the acquiring uplink channel loss includes:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is less than or equal to 2, calculating the uplink channel loss PL UL The method comprises the following steps:
Optionally, the acquiring uplink channel loss of the base station includes:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2, calculating the uplink channel loss PL UL The method comprises the following steps:
calculating average received power P' (t) of the narrowband physical uplink shared channel NPUSCH:
P'(t)＝P PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported for PHY, N RX The number of the uplink receiving antennas;
PL UL ＝P TX -P' (t), where P TX Maximum transmit power P for user terminal MAX 。
Optionally, the method further comprises: the base station inquires the user terminal capability table to obtain the maximum transmitting power P of the user terminal MAX 。
Optionally, the P TX ＝23dBm。
Optionally, the downlink evaluation is performed according to the base station transmitting power and the uplink channel loss, specifically:
calculating Reference Signal Received Power (RSRP):
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
Optionally, the downlink evaluation is performed according to the base station transmitting power and the uplink channel loss, specifically:
calculating the reference signal received power RSRP:
RSRP＝P NRS -(P TX -P'(t))；
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
In summary, the computer storage medium provided by the embodiment of the invention estimates the downlink loss by calculating the uplink loss, estimates the uplink loss by means of PHR reported by the terminal through the technical scheme of estimating the downlink coverage based on the link symmetry, greatly improves the testing efficiency and the testing precision of the downlink, breaks through the protocol, and greatly improves the network evaluation efficiency.
Fig. 5 shows a schematic structural diagram of an embodiment of a downlink evaluation device provided by the present invention, and the specific embodiment of the present invention is not limited to the specific implementation of the downlink evaluation device.
As shown in fig. 5, the downlink evaluation apparatus may include: a processor 502, a communication interface (Communications Interface) 504, a memory 506, and a communication bus 508.
Wherein: processor 502, communication interface 504, and memory 506 communicate with each other via communication bus 508. A communication interface 504 for communicating with network elements of other devices, such as clients or other servers. The processor 502 is configured to execute the program 510, and may specifically perform the relevant steps in the embodiment of the downlink evaluation method described above.
In particular, program 510 may include program code including computer-operating instructions.
The processor 502 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention. The one or more processors comprised by the downlink evaluation device may be the same type of processor, such as one or more CPUs; but may also be different types of processors such as one or more CPUs and one or more ASICs.
A memory 506 for storing a program 510. Memory 506 may comprise high-speed RAM memory or may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The program 510 may be specifically operable to cause the processor 502 to:
acquiring the transmitting power of a base station;
acquiring uplink channel loss;
and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss.
Optionally, the acquiring the base station transmitting power specifically includes:
acquiring downlink narrowband reference signal transmitting power P NRS 。
Optionally, the acquiring uplink channel loss includes:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is less than or equal to 2, calculating the uplink channel loss PL UL The method comprises the following steps:
Optionally, the acquiring uplink channel loss of the base station includes:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2, calculating the uplink channel loss PL UL The method comprises the following steps:
calculating average received power P' (t) of the narrowband physical uplink shared channel NPUSCH:
P'(t)＝P PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported for PHY, N RX The number of the uplink receiving antennas;
PL UL ＝P TX -P' (t), where P TX Maximum transmit power P for user terminal MAX 。
Optionally, the method further comprises: the base station inquires the user terminal capability table to obtain the maximum transmitting power P of the user terminal MAX 。
Optionally, the P TX ＝23dBm。
Optionally, the downlink evaluation is performed according to the base station transmitting power and the uplink channel loss, specifically:
calculating Reference Signal Received Power (RSRP):
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
Optionally, the downlink evaluation is performed according to the base station transmitting power and the uplink channel loss, specifically:
calculating the reference signal received power RSRP:
RSRP＝P NRS -(P TX -P'(t))；
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
In summary, the downlink evaluation device provided by the embodiment of the invention evaluates the downlink loss by calculating the uplink loss, evaluates the uplink loss by means of PHR reported by the terminal through the technical scheme of evaluating the downlink coverage based on the link symmetry, greatly improves the testing efficiency and the testing precision of the downlink, breaks through the tuning of the protocol, and greatly improves the network evaluation efficiency.
The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, embodiments of the present invention are not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
Claims (8)
1. A method of downlink evaluation, comprising:
acquiring the transmitting power of a base station; the acquiring the transmitting power of the base station specifically comprises the following steps:
acquiring downlink narrowband reference signal transmitting power P NRS ；
Acquiring uplink channel loss; when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2, calculating the uplink channel loss PL UL The method comprises the following steps:
calculating average received power P' (t) of the narrowband physical uplink shared channel NPUSCH:
P'(t)＝P PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported for PHY, N RX The number of the uplink receiving antennas;
PL UL ＝P TX -P' (t), where P TX Maximum transmit power P for user terminal MAX ；
Performing downlink evaluation according to the base station transmitting power and the uplink channel loss; and performing downlink evaluation according to the base station transmitting power and the uplink channel loss, specifically:
calculating the reference signal received power RSRP:
RSRP＝P NRS -(P TX -P'(t))；
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
2. The downlink evaluation method of claim 1, wherein the acquiring uplink channel loss comprises:
when the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is less than or equal to 2, calculating the uplink channel loss PL UL The method comprises the following steps:
3. The downlink evaluation method according to claim 1, wherein the method further comprises: inquiring a user terminal capability table to obtain the maximum transmitting power P of the user terminal MAX 。
4. The downlink evaluation method of claim 1, wherein the P TX ＝23dBm。
5. The downlink evaluation method according to claim 2, wherein the downlink evaluation is performed according to the base station transmission power and the uplink channel loss, specifically:
calculating Reference Signal Received Power (RSRP):
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
6. A base station, comprising: a transceiver and a processor;
the transceiver: the method comprises the steps of receiving a signal sent by a terminal and sending a reference signal to the terminal;
the processor: the method comprises the steps of acquiring transmitting power of a base station, acquiring uplink channel loss, and carrying out downlink evaluation according to the transmitting power of the base station and the uplink channel loss; the method specifically comprises the following steps of:
acquiring downlink narrowband reference signal transmitting power P NRS ；
When the retransmission times of the NPUSCH of the narrowband physical uplink shared channel is more than 2, calculating the uplink channel loss PL UL The method comprises the following steps:
calculating average received power P' (t) of the narrowband physical uplink shared channel NPUSCH:
P'(t)＝P PHY (t)-10*log 10 (N RX ) Wherein P is PHY (t) received signal power reported for PHY, N RX The number of the uplink receiving antennas;
PL UL ＝P TX -P' (t), where P TX Maximum transmit power P for user terminal MAX ；
Performing downlink evaluation according to the base station transmitting power and the uplink channel loss; and performing downlink evaluation according to the base station transmitting power and the uplink channel loss, specifically:
calculating the reference signal received power RSRP:
RSRP＝P NRS -(P TX -P'(t))；
and carrying out downlink evaluation according to the Reference Signal Received Power (RSRP).
7. A downlink evaluation apparatus, comprising: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus;
the memory is configured to store at least one executable instruction that causes the processor to perform the downlink evaluation method according to any one of claims 1-5.
8. A computer storage medium having stored therein at least one executable instruction for causing a processor to perform the downlink evaluation method of any one of claims 1-5.
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