CN111294913A - NB-IOT terminal chip narrowband uplink shared channel transmission power control method - Google Patents
NB-IOT terminal chip narrowband uplink shared channel transmission power control method Download PDFInfo
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- CN111294913A CN111294913A CN202010085366.9A CN202010085366A CN111294913A CN 111294913 A CN111294913 A CN 111294913A CN 202010085366 A CN202010085366 A CN 202010085366A CN 111294913 A CN111294913 A CN 111294913A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
- H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the speed of the mobile
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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
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Abstract
The invention relates to the technical field of narrowband Internet of things, and particularly discloses a method for controlling the transmission power of a narrowband uplink shared channel of an NB-IOT terminal chip, which comprises the steps of initializing the transmission power when npusch transmits for the first time; and measuring the receiving power of the downlink reference signal in the ul gap, and updating the sending power based on the receiving power of the downlink reference signal. By adopting the technical scheme of the invention, the processor resource can be effectively saved. Effective measurement opportunities are increased, and the transmission power is updated through prediction when the measurement opportunity conditions are not met, so that the overall power control is more accurate.
Description
Technical Field
The invention relates to the technical field of narrowband Internet of things, in particular to a method for controlling the sending power of a narrowband uplink shared channel of an NB-IOT terminal chip.
Background
The NB-IOT (Narrow Band Internet of Things) is an Internet of Things technology evolved based on an LTE (Long term evolution) standard protocol, has many advantages of high spectrum resource utilization rate, supporting a large number of medium-low speed users, deep coverage, reducing terminal power consumption, and the like, and is mainly oriented to an Internet of Things application scenario of medium-low speed, deep coverage, low power consumption, and large connection.
In the NB-IOT system, the transmission power parameter configured by RRC mainly comes from system information and proprietary configuration, and does not change in real time during uplink transmission, so the power change during transmission mainly comes from real-time calculation of path loss. The path loss is obtained by the difference between the downlink reference power, the non-anchor carrier power deviation and the actually measured downlink received power, and the expression is as follows:
PLc＝nrs-Power+nrs-PowerOffsetNonAnchor–NRSRP
since the downlink reference Power nrs-Power and the non-anchor carrier Power deviation nrs-poweroffset nonanchor are configured by RRC once in the above expression, the real-time variation of the path loss mainly comes from the measured value of the downlink reference signal received Power NRSRP.
Unlike LTE, NB-IOT is a half-duplex system, and a terminal in an uplink transmission subframe cannot receive downlink signals, and measurement of downlink reference signals can only be performed in a 40ms ul gap window with a period of 256+40 ms. Thus, although the protocol specifies that npusch transmit power calculations are in slot units, recalculating power every slot without any change in parameters during consecutive npusch uplink transmissions becomes meaningless and wastes processor resources.
For this reason, a transmission power calculation method that saves processor resources is required.
Disclosure of Invention
The invention provides a method for controlling the sending power of a narrow-band uplink shared channel of an NB-IOT terminal chip, which can effectively save processor resources.
In order to solve the technical problem, the present application provides the following technical solutions:
a narrow-band uplink shared channel sending power control method for an NB-IOT terminal chip comprises initializing sending power when npusch sends for the first time; and measuring the receiving power of the downlink reference signal in the ul gap, and updating the sending power based on the receiving power of the downlink reference signal.
The basic scheme principle and the beneficial effects are as follows:
in the scheme, the sending power is updated only in the npusch sending initialization process and the ul gap internal re-initialization after the measurement is completed, and the sending power is not calculated any more in other sending time, so that unnecessary calculation cost is avoided, and processor resources can be effectively saved.
Further, according to the length of the time occupied by the nprach resource, whether the measurement of the downlink reference signal received power can be performed within the current occupied time is judged, and if not, the measurement is not performed; if yes, the downlink reference signal received power is measured during nprach resource, and after the measurement is completed, the transmission power is updated based on the downlink reference signal received power.
In the npusch transmission process, subframes occupied by nprach resource may be encountered, and these subframes cannot be used for npusch transmission, and these subframes can be used for downlink measurement. Therefore, in the preferred embodiment, whether the downlink reference signal received power can be measured (enough NRS) within the current occupied time is determined according to the length of the nprach resource occupied time, and if yes, the downlink reference signal received power is measured during the nprach resource period, and after the measurement is completed, the transmission power is updated based on the downlink reference signal received power, so that the uplink transmission power control can be more accurate.
Further, when calculating the time length occupied by npreach resource, the method includes the following steps:
s1, judging whether the current time is within an npreach resource range, and jumping to S2 if the current time is within the npreach resource range; if not, jump to S4;
s2, calculating the end time of npreach resource; judging whether the end time of the nprach resource is within the ul gap range, and jumping to S3 if the end time of the nprach resource is within the ul gap range; if not, jumping to S7;
s3, calculating the end time of ul gap and jumping to S7;
s4, judging whether the current time is within the ul gap range; if the signal is in the ul gap range; jump to S5; if not, ending;
s5, calculating the end time of ul gap; then judging whether the end time of ul gap is within the nprachresource range; if the current position is within the nprach resource range, jumping to S6; if not, in the nprachresource range; jump to S7;
s6, calculating the end time of npreach resource;
and S7, subtracting the starting time based on the ending time, wherein the difference is the occupation time length.
In the preferred scheme, the non-overlapping and overlapping conditions are simplified and merged into two conditions of ul gap and nprachresource, and the two conditions are analyzed and processed respectively. If overlap occurs, the measurement can be continued until the end of the whole overlap time (before npusch initialization) without measuring ul gap and nprach resource separately, so that the calculation times are reduced; because time can be combined together during overlapping, nprach resource which is originally lower than the threshold value can be used for measurement after being combined with ul gap, the occurrence probability that nprach resource exists alone and cannot be used for measurement is reduced, the measurement opportunity is fully utilized, and the calculation of the transmission power can be more accurate.
The occupied time length calculated by the optimal scheme enables ul gap time and nprach resource time to be overlapped for measurement, the number of time windows capable of measuring is increased, and the real-time performance and the accuracy of a measuring result are improved.
Further, the method also comprises a step of evaluating the moving speed of the terminal, wherein whether the moving speed is greater than a threshold value or not is judged, and if the moving speed is greater than the threshold value, a prediction algorithm is started; the transmit power is adjusted based on a predictive algorithm.
The NB-IOT terminals are mostly used in low-speed mobile scenarios, and the adjustment time interval of the effective power control during npusch transmission is relatively large, which is satisfied in most cases. However, if the usage scenario needs to be extended to a scenario with a slightly faster moving speed, the adjustment period of a maximum of 296ms (256+40) is delayed, and if the coverage area of the surrounding NB-IOT base station is not large (a dense city is deployed), the movement of this time may cause the npusch signal power reaching the base station to deviate greatly from the actual demand. In order to solve the problem, in the preferred embodiment, the moving speed is evaluated, a threshold is set, and when the moving speed is greater than the threshold, a prediction algorithm is started to continuously adjust the npusch transmitting power in the cycle, so that the transmitting power can be changed in real time and approaches to the actual demand.
Further, when the transmission power is updated based on the measured value of the downlink reference signal received power, the path loss is calculated based on the measured value of the downlink reference signal received power, and then the transmission power is updated based on the path loss.
Drawings
FIG. 1 is a schematic view of intra-ulgap measurement according to the first embodiment;
FIG. 2 is a diagram illustrating the duration of the nprach resource occupancy of embodiment one;
FIG. 3 is a flowchart of the first embodiment when calculating the time duration occupied by nprach resource;
FIG. 4 is a schematic diagram of the overlap of ul gap and nprach resource of the first embodiment;
FIG. 5 is a schematic illustration of measurements when ul gap and nprach resource overlap for example one;
fig. 6 is a diagram illustrating transmission power adjustment according to the second embodiment.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
In the method for controlling the transmission power of the narrowband uplink shared channel of the NB-IOT terminal chip according to this embodiment, as shown in fig. 1, the method includes initializing the transmission power when npusch transmits for the first time; the method also comprises the steps of measuring the receiving power of the downlink reference signal in the ul gap, calculating the path loss based on the measured value of the receiving power of the downlink reference signal, and updating the sending power based on the path loss.
As shown in fig. 2, according to the length of the time occupied by the nprach resource, it is determined whether the measurement of the downlink reference signal received power can be performed within the current occupied time, and if not, no measurement is performed; if so, the downlink reference signal received power is measured during nprachresource. In this embodiment, the occupied time length for measuring the downlink reference signal received power is related to the signal-to-noise ratio, and the lower the signal-to-noise ratio, the longer the time required. The resource time is configured by the network, and the terminal cannot change the resource time and can only judge whether the requirement of the time length required to be measured under the current signal-to-noise ratio environment is met. This part belongs to the prior art and is not described in detail here.
As shown in fig. 3, when calculating the length of time occupied by nprach resource, the method includes the following steps:
s1, judging whether the current time is within an npreach resource range, and jumping to S2 if the current time is within the npreach resource range; if not, jump to S4;
s2, calculating the end time of npreach resource; judging whether the end time of the nprach resource is within the ul gap range, and jumping to S3 if the end time of the nprach resource is within the ul gap range; if not, jumping to S7;
s3, calculating the end time of ul gap and jumping to S7;
s4, judging whether the current time is within the ul gap range; if the signal is in the ul gap range; jump to S5; if not, ending;
s5, calculating the end time of ul gap; then judging whether the end time of ul gap is within the nprachresource range; if the current position is within the nprach resource range, jumping to S6; if not, in the nprachresource range; jump to S7;
s6, calculating the end time of npreach resource;
and S7, subtracting the starting time based on the ending time, wherein the difference is the occupation time length.
As shown in fig. 4, in this embodiment, the non-overlapping and overlapping cases are unified and simplified into two cases, i.e., ul gap and nprach resource, which are encountered first, and the two cases are analyzed and processed respectively. As shown in fig. 5, if overlap occurs, the measurement can be continued until the end of the entire overlap time (before npusch initialization) without separately measuring ul gap and nprach resource, reducing the number of calculations; because time can be combined together during overlapping, nprach resource which is originally lower than the threshold value can be used for measurement after being combined with ul gap, the occurrence probability that nprach resource exists alone and cannot be used for measurement is reduced, the measurement opportunity is fully utilized, and the calculation of the transmission power can be more accurate.
The embodiment updates the transmission power by utilizing the overlapping opportunity of ul gap and nprach resource, reduces the times of meaningless measurement and power calculation by analyzing the self time characteristics and the overlapping relation of the ul gap and the nprach resource, ensures that the measurement opportunity is utilized more fully, ensures that the latest measurement result is more conveniently applied to the calculation of the transmission power, and ensures that the transmission power is more accurate.
Example two
The difference between this embodiment and the first embodiment is that, as shown in fig. 6, in the step of evaluating the moving speed of the terminal in this embodiment, it is determined whether the moving speed is greater than a threshold value, and if so, a prediction algorithm is started; the transmit power is adjusted based on a predictive algorithm.
By introducing the prediction method, the transmission power of the NB-IOT terminal at a slightly higher moving rate can be closer to the actual requirement, and the application scene is effectively expanded. In this embodiment, the prediction algorithm may adopt a conventional prediction algorithm such as a cubic exponential smoothing algorithm.
EXAMPLE III
The difference between this embodiment and the first embodiment is that, in this embodiment, when the length of time occupied by nprach resource is calculated, and when the ul gap and nprach resource do not satisfy the measurement condition after time superposition, the downlink reference signal received power is estimated based on a prediction algorithm, and the path loss is calculated, and then the transmission power is updated based on the path loss.
In the embodiment, effective measurement opportunities are increased, and the transmission power is updated through prediction when the measurement opportunity conditions are not met, so that the overall power control is more accurate.
The above are merely examples of the present invention, and the present invention is not limited to the field related to this embodiment, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art can know all the common technical knowledge in the technical field before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the scheme, and some typical known structures or known methods should not become barriers to the implementation of the present invention by those skilled in the art in light of the teaching provided in the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (5)
1. A narrow-band uplink shared channel sending power control method for an NB-IOT terminal chip comprises initializing sending power when npusch sends for the first time; the method is characterized by also comprising the steps of measuring the receiving power of the downlink reference signal in the ul gap and updating the sending power based on the receiving power of the downlink reference signal.
2. The method for controlling the transmission power of the narrowband uplink shared channel of the NB-IOT terminal chip according to claim 1, wherein: judging whether the downlink reference signal receiving power can be measured or not in the current occupation time according to the occupation time length of the nprach resource, and if not, not measuring; if yes, the downlink reference signal received power is measured during nprach resource, and after the measurement is completed, the transmission power is updated based on the downlink reference signal received power.
3. The method for controlling the transmission power of the narrow-band uplink shared channel of the NB-IOT terminal chip according to claim 2, wherein: when the time length occupied by the npreach resource is calculated, the method comprises the following steps:
s1, judging whether the current time is within an npreach resource range, and jumping to S2 if the current time is within the npreach resource range; if not, jump to S4;
s2, calculating the end time of npreach resource; judging whether the end time of the nprach resource is within the ul gap range, and jumping to S3 if the end time of the nprach resource is within the ul gap range; if not, jumping to S7;
s3, calculating the end time of ul gap and jumping to S7;
s4, judging whether the current time is within the ul gap range; if the signal is in the ul gap range; jump to S5; if not, ending;
s5, calculating the end time of ul gap; then judging whether the end time of ul gap is within the nprach resource range; if the current position is within the nprach resource range, jumping to S6; if not, in the nprach resource range; jump to S7;
s6, calculating the end time of npreach resource;
and S7, subtracting the starting time based on the ending time, wherein the difference is the occupation time length.
4. The method for controlling the transmission power of the narrowband uplink shared channel of the NB-IOT terminal chip according to claim 1, wherein: the method also comprises a step of evaluating the moving speed of the terminal, wherein the step of judging whether the moving speed is greater than a threshold value or not is carried out, and if so, a prediction algorithm is started; the transmit power is adjusted based on a predictive algorithm.
5. The method for controlling the transmission power of the narrowband uplink shared channel of the NB-IOT terminal chip according to claim 1, wherein: when the transmission power is updated based on the measured value of the downlink reference signal received power, the path loss is calculated based on the measured value of the downlink reference signal received power, and then the transmission power is updated based on the path loss.
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