CN113225765B - Dual-connection main path switching method and device - Google Patents

Dual-connection main path switching method and device Download PDF

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CN113225765B
CN113225765B CN202010071689.2A CN202010071689A CN113225765B CN 113225765 B CN113225765 B CN 113225765B CN 202010071689 A CN202010071689 A CN 202010071689A CN 113225765 B CN113225765 B CN 113225765B
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comparison result
srs
main path
user terminal
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CN113225765A (en
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侯欣静
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Datang Mobile Communications Equipment Co Ltd
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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
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Abstract

The application discloses a method and a device for switching a dual-connection main path, wherein in an EN-DC scene, the method comprises the following steps: a base station measures the SRS receiving power of an uplink reference signal (SRS) of a user terminal at an NR side; comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold; and when the number of times of measurement reaches a preset number N, determining whether the user terminal switches the main path or not according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement. The method and the device solve the technical problem that the utilization rate of a main path switching scheme is not high due to unreasonable switching of the dual-connection main path in the prior art.

Description

Dual-connection main path switching method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for switching a dual connection primary path.
Background
In an EN-DC (LTE-NR Dual Connectivity, LTE and NR Dual Connectivity) scenario of NSA (Non-stand alone networking), an LTE base station is a Master Node (MN), and an NR base station is a Secondary Node (SN). After the terminal is accessed, the base station can configure whether a primary path (primarypath) of the terminal is MN or SN according to the condition of an uplink channel, so that the terminal can know whether the uplink data is transmitted on an LTE side or an NR side. If the terminal supports two paths of uplink data shunting of LTE (Long Term Evolution)/NR (New Radio, New air interface), the terminal simultaneously performs uplink data transmission on two sides of NR and LTE after the main path rate exceeds a rate threshold, so that most of the uplink service of the user is transmitted in the LTE cell when the terminal is at a difference point in the NR cell. When the radio signal of the NR cell is good, most of the uplink traffic of the user is transmitted in the NR cell.
In the prior art, an algorithm for realizing uplink data distribution is as follows: and the base station judges that the main path parameter of the terminal is configured to be the auxiliary node MN or SN. When the main path is configured as MN, the NR base station determines the number of times that the uplink SRS (Sounding Reference Signal, uplink Reference Signal) reception power is continuously greater than the SRS power high threshold, and when the number of times N is equal to the target number of times, changes the main path to SN and clears the number of times N by 0, and in the detection process, if the number of times does not reach N times, the number of times that the detected SRS reception power is less than the SRS power high threshold will also clear the number of times N by 0 (that is, if the uplink SRS reception power is not continuously greater than the SRS power high threshold N times, the main path will not be switched); when the main path is SN, the NR base station judges the number of times that the uplink SRS receiving power is continuously smaller than the SRS power low threshold, when the number of times N is equal to the target number of times, the main path is changed into MN, and the number of times N is cleared by 0 at the same time.
The above scheme provided by the prior art has extremely high requirements on the SRS measurement module channel, and switching cannot be performed if any receiving power jitter occurs, so that the phenomenon of switching the main path cannot occur at any probability when a terminal is disconnected in practical application of the scheme, thereby causing low utilization rate of the scheme and bringing about the problem that resources cannot be reasonably utilized.
Disclosure of Invention
The application provides a method and a device for switching a dual-connection main path, which are used for solving the technical problems that the utilization rate of a main path switching scheme is not high and resources cannot be reasonably utilized due to unreasonable switching of the dual-connection main path in the prior art.
In a first aspect, a method for switching a dual-connection main path is provided, where in a scenario of dual-connection EN-DC between LTE and NR, the method includes:
a base station measures the SRS receiving power of an uplink reference signal (SRS) of a user terminal at an NR side;
comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
and when the number of times of measurement reaches a preset number N, determining whether the user terminal switches the main path or not according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement.
In an optional implementation manner, the configuring the primary path parameter as an auxiliary node SN, and the determining, according to the primary path configured by the primary path parameter of the user terminal and a proportional value corresponding to the first comparison result or the second comparison result in N times of measurements, whether the user terminal performs switching of the primary path includes:
determining an adjustment value according to the ACK information and the NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value;
adjusting the preset times N by using the adjusting value, wherein the adjusted first target times are obtained;
taking a ratio of the number of times M1 that the first comparison result appears in the N measurements to the first target number of times as the proportional value;
and when the proportional value is larger than a first preset threshold value, switching the main path of the user terminal from the SN to the MN.
An optional implementation manner, where the main path parameter is configured as a main node MN, and the determining, according to the main path configured by the main path parameter of the user terminal and a proportional value corresponding to the first comparison result or the second comparison result in N times of measurements, whether the user terminal performs switching of the main path includes:
determining an adjustment value according to the ACK information and the NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value;
adjusting the preset times N by using the adjusting value to obtain adjusted second target times; adjusting the number L1 of the second comparison result in the N measurements by the adjusting value to obtain L2;
taking the ratio of the L2 to the second target number of times as the proportional value;
and when the proportional value is larger than a second preset threshold value, switching the main path of the user terminal from the MN to the SN.
In an optional embodiment, the ACK information is positively correlated with the adjustment value; the negatively correlating the NACK information with the adjustment value comprises:
when receiving the ACK information, the adjusting value is the sum of the adjusting value obtained at the previous time and the basic adjusting step length; wherein the basic adjustment step length is a target value bler of the error rate;
when NACK information is received, the adjusting value is the difference between the adjusting value obtained in the previous time and k times of basic adjusting step length; wherein the content of the first and second substances,
Figure BDA0002377459660000031
in an optional embodiment, the adjustment value corresponds to a value range of [ -1.5, 0.6 ].
In a second aspect, a dual-connection main path switching apparatus is provided, where in a scenario of dual-connection EN-DC between LTE and NR, the apparatus includes:
the measurement module is used for measuring the SRS receiving power of an uplink reference signal (SRS) of the user terminal at the NR side;
the comparison module is used for comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
and the switching module is used for determining whether the user terminal switches the main path or not according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement when the number of times of measurement reaches a preset number N.
In an optional implementation manner, the primary path parameter is configured to be an auxiliary node SN, and the switching module is specifically configured to determine an adjustment value according to ACK information and NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; adjusting the preset times N by using the adjusting value, wherein the adjusted first target times are obtained; taking a ratio of the number of times M1 that the first comparison result appears in the N measurements to the first target number of times as the proportional value; and when the proportional value is larger than a first preset threshold value, switching the main path of the user terminal from the SN to the MN.
In an optional implementation manner, the main path parameter is configured as a main node MN, and the switching module is specifically configured to determine an adjustment value according to ACK information and NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; adjusting the preset times N by using the adjusting value to obtain adjusted second target times; adjusting the number L1 of the second comparison result in the N measurements by the adjusting value to obtain L2; taking the ratio of the L2 to the second target number of times as the proportional value; and when the proportional value is larger than a second preset threshold value, switching the main path of the user terminal from the MN to the SN.
In an optional embodiment, the ACK information is positively correlated with the adjustment value; the negatively correlating the NACK information with the adjustment value comprises:
when receiving the ACK information, the adjusting value is the sum of the adjusting value obtained at the previous time and the basic adjusting step length; wherein the basic adjustment step length is a target value bler of the error rate;
when NACK information is received, the adjusting value is the difference between the adjusting value obtained in the previous time and k times of basic adjusting step length; wherein the content of the first and second substances,
Figure BDA0002377459660000041
in an optional embodiment, the adjustment value corresponds to a value range of [ -1.5, 0.6 ].
In a third aspect, a base station is provided, including:
a memory to store instructions; and
a processor configured to execute the instructions, wherein the instructions, when executed, cause the base station to implement the method of any of the first aspects.
In a fourth aspect, a storage medium comprises a computer program which, when run on a computer, causes the computer to carry out the method of any one of the first aspect.
The beneficial effect of this application is as follows:
in the method provided by the embodiment of the application, the base station determines whether to switch the main path according to the occupation ratio condition of the times that the SRS receiving power meets the corresponding power threshold in a certain detection time, so that the uplink channel condition of the terminal at the NR side (the occupation ratio of the times that the SRS receiving power meets the corresponding power threshold in the certain detection time) can be judged more truly and accurately, that is, the main path switching mode provided by the embodiment of the application is more closely related to the actual communication perception, and therefore the scheme provided by the embodiment of the application can timely change the main path when the uplink SRS power is integrally poor. If the terminal is located at the difference point in the NR cell, the user uplink data is mainly transmitted to the core network through the 4G base station, and if the wireless signal of the 5G cell is better, the user uplink data is mainly transmitted to the core network through the 5G base station.
Drawings
FIG. 1 is a schematic diagram of a prior art device involved in the EN-DC scenario of NSA;
fig. 2 is a schematic flowchart of a method for switching a dual-connection main path according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for switching a main path by configuring a main path parameter as an auxiliary node SN in the method provided in the embodiment of the present application;
fig. 4 is a schematic flowchart of a method for switching a main path by configuring a main path parameter as a main node MN in the method provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a dual-connection main path switching device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present application.
Detailed Description
In an EN-DC scenario in the prior art, a base station determines whether to switch a main path parameter of a terminal according to whether uplink SRS received power is continuously greater than an SRS power high threshold or continuously less than an SRS power low threshold, where when the continuously greater or continuously less times N are equal to a target time, the main path is switched and the times N are cleared by 0.
In the prior art scheme, the number N of times that the SRS received power continuously satisfies the corresponding power threshold is used as a judgment basis, and if the SRS received power does not satisfy the corresponding power threshold once, the number N is set to 0, but in actual measurement, a power jitter situation often occurs, and although the power jitter cannot represent that the network environment is improved, the number N is directly set to 0 according to the prior art scheme, which results in that the main path switching cannot be performed when the terminal is disconnected in practical application at a high probability; certainly, if the probability of switching is increased, the condition for switching the main path can be reduced, that is, the modification times N target threshold changes the difficulty level of changing the main path, and the modification times N target threshold is small, although the main path can be changed more easily when the receiving power is jittered, based on the jitter phenomenon in actual measurement, the ping-pong effect is easily caused after the N target threshold is reduced, unnecessary signaling is consumed, and the energy consumption of the terminal is increased.
According to the analysis, the method for judging whether to switch the main path by using the times N continuously meeting the corresponding power threshold is very easy to be interfered by power jitter, and the switching judgment can not meet the actual use requirement; but the switching difficulty is reduced, and the energy consumption of the terminal is increased. Based on the above analysis of the actual situation and the network environment situation in the prior art, it can be determined that the probability of occurrence that the SRS received power satisfies the corresponding power threshold can better reflect the actual network situation, so in the dual-connection main path switching method provided in the embodiment of the present application, whether to perform main path switching is determined based on the proportion of occurrences that the SRS received power satisfies the corresponding power threshold in multiple detections, and the overall idea of the method is as follows:
a base station measures the SRS receiving power of an uplink reference signal (SRS) of a user terminal at an NR side;
comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
and when the number of times of measurement reaches a preset number N, determining whether the user terminal switches the main path or not according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement.
In the method provided by the embodiment of the application, the base station determines whether to switch the main path according to the occupation ratio condition of the times that the SRS receiving power meets the corresponding power threshold in a certain detection time, so that the uplink channel condition of the terminal at the NR side (the occupation ratio of the times that the SRS receiving power meets the corresponding power threshold in the certain detection time) can be judged more truly and accurately, that is, the main path switching mode provided by the embodiment of the application is more closely related to the actual communication perception, and therefore the scheme provided by the embodiment of the application can timely change the main path when the uplink SRS power is integrally poor. If the terminal is located at the difference point in the NR cell, the user uplink data is mainly transmitted to the core network through the 4G base station, and if the wireless signal of the 5G cell is better, the user uplink data is mainly transmitted to the core network through the 5G base station.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
To describe the scheme provided by the embodiment of the present application in more detail, first, a scenario used by the embodiment of the present application is briefly described, as shown in fig. 1, in an EN-DC scenario of NSA, a user terminal is simultaneously connected to a 4G base station and a 5G base station (the terminal supports LTE and NR uplink data splitting), and after the user terminal accesses a network, the base station may configure, through an uplink channel condition, an uplink transmission main path of the user terminal as an LTE cell (that is, data transmission is implemented through the 4G base station) or an NR cell (that is, data transmission is implemented through the 5G base station), so that the user terminal knows whether to transmit uplink data on an LTE side or an NR side. Based on a preset transmission strategy, when the user terminal is located at a bad point in the NR cell, most of the uplink service of the user is transmitted in the LTE cell. When the radio signal of the NR cell is good, most of the uplink traffic of the user is transmitted in the NR cell.
Based on the above usage scenarios, the method and apparatus provided by the embodiments of the present application are further described in detail below with reference to the accompanying drawings and specific application scenarios:
example one
As shown in fig. 2, an embodiment of the present application provides a dual connectivity primary path switching method, which may include, in LTE and NR dual connectivity EN-DC:
step 201, a base station measures the uplink reference signal SRS received power of a user terminal at an NR side;
step 202, comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
the SRS power high threshold and the SRS power low threshold in this embodiment mainly refer to the received power when the channel quality is good and the received power when the channel quality is poor, and in the prior art, the SRS power high threshold is generally-80 dbm, and the SRS power low threshold is generally-110 dbm. Of course, in a specific practical application, if the SRS power high threshold and the SRS power low threshold have other values, the method provided in the embodiment of the present application is also applicable.
The method provided by the embodiment of the application is suitable for an EN-DC scene, so that a user terminal is connected with two base stations (an LTE base station and an NR base station); based on a data offloading mechanism in an EN-DC scenario, a base station selects a main path according to a wireless signal state of a cell, that is, selects most data to be transmitted through an NR cell or an LTE cell. The specific switching scenario includes: SN switches to MN (i.e. most data is transmitted over NR cells, most data is transmitted over LTE cells), MN switches to SN (i.e. most data is transmitted over LTE cells, most data is transmitted over NR cells);
in this embodiment, the switching determination is made by the SRS received power of the user equipment measured by the NR base station, and the received power reflects the radio signal state of the NR cell; the concrete conditions comprise:
when the main path parameter is configured to be SN, data of the user terminal is mainly transmitted through the 5G base station, but if the SRS received power is smaller than the SRS power low threshold (i.e. the first comparison result) most of the time (measured many times), it indicates that the wireless signal state of the current NR cell is poor and cannot bear most of the data transmission, and in order to ensure the data transmission requirement, the main path needs to be switched, that is, the main path needs to be switched from SN to MN;
secondly, when the main path parameters are configured to be MN, most data of the user terminal are transmitted in an LTE cell, the SRS received power measured by the NR base station indicates the radio state of the NR cell, and the main path is switched from MN to SN only when the radio state of the NR cell is good enough (or the radio state of the NR cell is good enough than that of the LTE cell); therefore, in this case, if the SRS received power measured by the NR base station is greater than the SRS power high threshold most of the time (multiple measurements) (i.e., the second comparison result), it indicates that the wireless signal state of the current NR cell is good and can bear most of the data transmission tasks, so that the main path may be switched, that is, the main path is switched from MN to SN, in order to ensure the data transmission requirement.
Step 203, when the number of times of the measurement reaches a preset number N, determining whether the user terminal switches the main path according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement.
In the prior art, when judging whether to switch the main path, the main path switching is based on that the SRS receiving power is larger than or smaller than the threshold value for a plurality of times continuously, but the judgment mode has high requirement on the network state, is influenced by various factors and cannot be timely and effectively switched according to the network condition, so that the effect of resource utilization cannot be well achieved; in view of the situation that the prior art cannot effectively solve the problem of the prior art by increasing and decreasing the threshold value, the embodiments of the present application provide a method for determining whether to perform main path switching based on a general probability condition of the network state (for example, the measured SRS received power is greater than the threshold value or less than the threshold value for multiple times). In the method provided in this embodiment, the NR base station is used to measure the SRS received power of the user terminal, so as to more reliably measure the quality of the uplink air interface channel at the 5G side, and when it is determined that the network environment at the 5G side is really bad (the occurrence ratio of the first comparison result exceeds the set threshold), the uplink data of the terminal is configured to be transmitted through the LTE cell, so that the user terminal can select the NR cell as much as possible to transmit data, and thus the uplink data transmission can be completed more quickly. The advantage of high speed rate of NR can be fully utilized, and the uplink data of the terminal can be transmitted as quickly as possible.
In this embodiment of the present application, based on that the current primary path of the user terminal is different, the corresponding switching determination criteria may also be correspondingly different, and in order to describe the method provided in this embodiment in more detail, the following description is performed to switch the primary path from the SN to the MN, and to switch the MN to the SN, respectively, and the specific implementation may be:
(1) the configuring of the main path parameter to an auxiliary node SN, and the determining whether the user terminal performs the switching of the main path according to the main path configured by the main path parameter of the user terminal and a proportional value corresponding to the first comparison result in N measurements includes (the method implementation flow is shown in fig. 3):
step 301, determining an adjustment value according to the received ACK information and NACK information in N measurements; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value;
in an actual network environment, besides that the SRS reception power may reflect the network state of the cell, the ACK/NACK information received by the base station may also reflect the communication state of the cell, and because NACK may be received if data reception is unsuccessful, the communication state of the cell is also reflected from some factors, so in this embodiment, when the ratio of the first comparison result and the second comparison result is determined, the number of times of receiving the ACK/NACK information is also used as an adjustment factor, and the ratio is adjusted.
In the embodiment, when adjusting N, all ACK and NACK information reported in the SRS measurement processes for N times is based. The ACK and the NACK are obtained after the base station decodes the uplink slot data, the ACK is obtained when the uplink slot data is decoded correctly, and the NACK is obtained when the uplink slot data is decoded incorrectly.
Step 302, adjusting the preset times N by using the adjusting value to obtain an adjusted preset time NFirst target number of times Nx1；
In a specific application scenario, assuming that ACK/NACK information of an initially transmitted data block j is received by a gNB at time i, if a Cyclic Redundancy Check (CRC) Check value of the data block is 1, indicating that the data block is decoded incorrectly, that is, a feedback value is NACK (that is, NACK information is received), and calculating a current adjustment value VaddIs a Vadd-1-K (step), wherein Vadd-1The initial value of the adjustment value is 0, wherein the adjustment value is calculated for the ACK or NACK information received at the previous time; k is a set constant, step is adjusted based on step, and in a specific usage scenario, the value of step may be equal to a target value of bler (block error rate, or referred to as bit error rate).
If the CRC value of the data block is 0, indicating that the data block is decoded correctly, namely the feedback value is ACK information, calculating and updating VaddA value of Vadd-1+(step)。
In this embodiment, before the number of SRS measurements does not reach N times, the adjustment value is updated every time ACK information or NACK information is received, and finally the first target number of times N is obtainedx1＝N+VaddThe method is based on a result value obtained after all ACK information and NACK information are received in the SRS measurement process for N times and are subjected to comprehensive calculation.
Step 303, taking the ratio of the number M1 of occurrences of the first comparison result in the N measurements to the first target number as the ratio;
in this example the ratio is M1/[ N + V ]add]From this formula, it can be determined that V is after receiving NACK informationaddIs a Vadd-1-K × (step) according to the above ratio formula, it can be determined that the ratio value after adjustment becomes larger than that before adjustment, directly reflecting the influence of the ratio value of the received NACK information, and further intuitively reflecting the situation that the network status fed back by the received NACK information may be poorThe handover decision can be more adaptive to the actual situation of the cell.
After receiving the ACK message, it may be determined that the cell can normally transmit data, which indicates to a certain extent that the network state of the cell in which the ue is currently located is relatively normal, and the corresponding adjustment value VaddIs a Vadd-1+ (step); the final proportion value can be determined to be adjusted to be smaller according to the proportion value calculation formula, so that the probability of switching the main path is reduced, and the probability of continuously selecting the NR cell for data transmission by the user terminal is improved.
Step 304, when the ratio value is greater than a first preset threshold, switching the main path of the user terminal from SN to MN.
In this example, the main path for uplink data transmission in the EN-DC scenario is more reliably selected based on the measured SRS received power and the ACK/NACK information of the uplink data block. In this embodiment, the ratio value occupied by the first comparison result is also adjusted by using the uplink data ACK/NACK information, so that the judgment condition for finally performing the main path switching is more suitable for the actual network condition of the cell, and thus, the user terminal can make full use of each uplink transmission opportunity, and the main path switching decision is more reliable.
(2) The main path parameter is configured as a main node MN, and the determining whether the user terminal performs the main path switching according to the main path configured by the user terminal main path parameter and a proportional value corresponding to the second comparison result in the N measurements includes (the method implementation flow is shown in fig. 4):
step 401, determining an adjustment value according to the received ACK information and NACK information in the N measurements; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value;
step 402, adjusting the preset times N by using the adjustment value to obtain the adjusted second target times Nx2(ii) a Adjusting the occurrence frequency L1 of the second comparison result in N times of measurement by using the adjustment value to obtain L2;
the preset times N and the times L1 are adjusted in the same way as the previous step 202, which is performed byAdjustment value VaddAnd (3) adjusting: second target number of times Nx2＝N+Vadd，L2＝L1+Vadd；
Step 403, mixing the L2 with the Nx2The ratio of (a) to (b) is taken as the proportional value;
step 404, when the ratio value is greater than a second preset threshold, switching the main path of the user terminal from MN to SN.
In this embodiment, the first preset threshold in the embodiment shown in fig. 3 is the same as the second threshold in the embodiment shown in fig. 4.
In this example, in order to ensure the consistency of the calculation, in the embodiments shown in fig. 2 and 3, the specific ACK information is positively correlated with the adjustment value; the negative correlation of the NACK information with the adjustment value may be:
when receiving the ACK information, the adjusting value is the sum of the previous adjusting value and the basic adjusting step length; wherein the basic adjustment step length is a target value bler of the error rate;
when NACK information is received, the adjusting value is the difference between the previous adjusting value and k times of basic adjusting step length; wherein the content of the first and second substances,
Figure BDA0002377459660000131
since receiving NACK information means that the channel quality of the current cell is poor, in order to ensure the reliability of the network state, the adjustment step size is reduced by K step sizes when NACK information is received, thereby achieving a better convergence effect.
In this example, since the communication system has a target value for the error rate of the message, which is bler in the embodiment of the present application, the bler (block error rate, or bit error rate) is 10% for normal data traffic. Of course, the actual communication system may reduce the error rate by some adaptive method to approach the target error rate (e.g., 10%). QoS (Quality of service) is for data transmission correctness and reliability, for example, voice service reliability requires high requirement, and its error rate (error transmission rate) may need to be 1%; for data services (such as internet access), the bit error rate can be set to 10%, so according to QoS requirements of different services, the bler in the embodiment of the present application can adopt two types, 10% and 1%, or set the bler to other values according to communication quality requirements; when bler is 10%, K is 9.
The step of the basic adjustment step is equal to the value of bler, and in order to improve the consistency of data for program implementation, step in this embodiment may be implemented by using a formula, and specifically, the formula may be:
Figure BDA0002377459660000132
wherein the initialization parameter of the adjustment value may be 0, i.e. Vadd＝0。
Based on the above description of the embodiment, the ACK/NACK information of the initial transmission data block j is received at the time igNB, if the CRC check value of the data block is 1, the data block is indicated to be decoded incorrectly, that is, the feedback value is NACK, and the update V is calculatedaddA value of Vadd-K (step); if the CRC value of the data block is 0, indicating that the data block is decoded correctly, namely the feedback value is ACK, calculating an update VaddA value of Vadd-K (step), the specific scheme is as follows:
Figure BDA0002377459660000141
in this example, since the adjustment value indicates that the ratio of the measurement result is adjusted based on the received ACK information and NACK information, and the adjustment value does not determine the ratio of the last measurement result, the size of the adjustment value is limited in this embodiment, which may specifically be:
Vaddrange of (1), Vadd∈[Vadd_min,Vadd_max]Wherein, if Vadd＞Vadd_maxThen V isadd＝Vadd_maxIf V isadd＜Vadd_minThen V isadd＝Vadd_minIn which V isadd_minCan be taken as 1.5; vadd_maxAnd may take 0.6.
Above VaddExample (A) ofThe value range is an empirical value, and the value range may be adjusted according to the actual using process, and the specific value is set according to the actual application.
As shown in fig. 5, an embodiment of the present application further provides a dual-connection main path switching apparatus, where in a scenario where long term evolution LTE and new air interface NR are dual-connected to EN-DC, the apparatus 500 includes:
a measuring module 501, configured to measure an SRS received power of an uplink reference signal at an NR side of a user terminal;
a comparing module 502, configured to compare the SRS receive power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
the switching module 503 is configured to determine whether the user terminal performs the main path switching according to the main path configured by the main path parameter of the user terminal and a proportional value corresponding to the first comparison result or the second comparison result in the N times of measurements when the number of times of the measurements reaches a preset number N.
In this embodiment, the specific switching scenario of the main path of the terminal device includes: the SN is switched to the MN (that is, most of data is transmitted through the NR cell, and most of data is transmitted through the LTE cell), the MN is switched to the SN (that is, most of data is transmitted through the LTE cell, and most of data is transmitted through the NR cell), and for different switching scenarios, the specific switching determination conditions are different, so that the specific implementation of the switching module for different switching scenarios may be:
1, when the primary path parameter is configured as a secondary node SN, i.e. to determine whether to switch the primary path from SN to MN:
the switching module 503 is specifically configured to determine an adjustment value according to the ACK information and the NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; adjusting the preset times N by using the adjusting value, wherein the adjusted first target times are obtained; taking a ratio of the number of times M1 that the first comparison result appears in the N measurements to the first target number of times as the proportional value; and when the proportional value is larger than a first preset threshold value, switching the main path of the user terminal from the SN to the MN.
2, when the main path parameter is configured to the main node MN, judging whether to switch the main path from the MN to the SN:
the switching module 503 is specifically configured to determine an adjustment value according to the ACK information and the NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; adjusting the preset times N by using the adjusting value to obtain adjusted second target times; adjusting the number L1 of the second comparison result in the N measurements by the adjusting value to obtain L2; taking the ratio of the L2 to the second target number of times as the proportional value; and when the proportional value is larger than a second preset threshold value, switching the main path of the user terminal from the MN to the SN.
Based on the above description, it can be determined that the basis for switching the main path in this embodiment includes ACK/NACK information in addition to the SRS received power of the user terminal; and the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; the specific impact of the ACK/NACK information on the last decision value may be:
when receiving the ACK information, the adjusting value is the sum of the adjusting value obtained at the previous time and the basic adjusting step length; wherein the basic adjustment step length is a target value bler of the error rate;
when NACK information is received, the adjusting value is the difference between the adjusting value obtained in the previous time and k times of basic adjusting step length; wherein the content of the first and second substances,
Figure BDA0002377459660000161
in order to control the influence of the adjustment value on the final measurement result, the adjustment value is limited in this embodiment, and the value range corresponding to the adjustment value may be [ -1.5, 0.6 ].
Based on the same inventive concept, an embodiment of the present application provides a base station, please refer to fig. 6, where the base station includes at least one processor 602 and a memory 601 connected to the at least one processor, a specific connection medium between the processor 602 and the memory 601 is not limited in the embodiment of the present application, fig. 6 illustrates that the processor 602 and the memory 601 are connected by a bus 600, the bus 600 is represented by a thick line in fig. 6, and a connection manner between other components is merely for an illustrative purpose and is not limited thereto. The bus 600 may be divided into an address bus, a data bus, a control bus, etc., and is shown with only one thick line in fig. 6 for ease of illustration, but does not represent only one bus or type of bus.
In the embodiment of the present application, the memory 601 stores instructions executable by the at least one processor 602, and the at least one processor 602 may perform the steps included in the method for controlling a network data forwarding plane by calling the instructions stored in the memory 601. The processor 602 is a control center of the base station, and may connect various parts of the entire base station by using various interfaces and lines, and implement various functions of the base station by executing instructions stored in the memory 601. Optionally, the processor 602 may include one or more processing units, and the processor 602 may integrate an application processor and a modem processor, wherein the application processor mainly handles operating systems, user interfaces, application programs, and the like, and the modem processor mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 602. In some embodiments, processor 602 and memory 601 may be implemented on the same chip, or in some embodiments, they may be implemented separately on separate chips.
Memory 601, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory 601 may include at least one type of storage medium, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charge Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and so on. The memory 601 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 601 in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function for storing program instructions and/or data.
The processor 602 may be a general-purpose processor, such as a Central Processing Unit (CPU), digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like, that implements or performs the methods, steps, and logic blocks disclosed in embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method for controlling a network data forwarding plane disclosed in the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
By programming the processor 602, the code corresponding to the method for controlling the network data forwarding plane described in the foregoing embodiment may be fixed in the chip, so that the chip can execute the steps of the method for controlling the network data forwarding plane when running.
Based on the same inventive concept, embodiments of the present application also provide a storage medium storing computer instructions, which, when executed on a computer, cause the computer to perform the steps of the method for controlling a network data forwarding plane as described above.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A method for switching a dual-connection main path is characterized in that under a Long Term Evolution (LTE) and new air interface (NR) dual-connection EN-DC scene, the method comprises the following steps:
a base station measures the SRS receiving power of an uplink reference signal (SRS) of a user terminal at an NR side;
comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
and when the number of times of measurement reaches a preset number N, determining whether the user terminal switches the main path or not according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement.
2. The method according to claim 1, wherein the primary path parameter is configured as a secondary node SN, and the determining whether the user terminal performs the switching of the primary path according to the primary path configured by the user terminal primary path parameter and a proportional value corresponding to the first comparison result or the second comparison result in N measurements includes:
determining an adjustment value according to the ACK information and the NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value;
adjusting the preset times N by using the adjusting value to obtain an adjusted first target time;
taking a ratio of the number of times M1 that the first comparison result appears in the N measurements to the first target number of times as the proportional value;
and when the proportional value is larger than a first preset threshold value, switching the main path of the user terminal from the SN to the MN.
3. The method according to claim 1, wherein the primary path parameter is configured as a primary node MN, and the determining whether the user terminal performs the switching of the primary path according to the primary path configured by the user terminal primary path parameter and a proportional value corresponding to the first comparison result or the second comparison result in N measurements includes:
determining an adjustment value according to the ACK information and the NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value;
adjusting the preset times N by using the adjusting value to obtain adjusted second target times; adjusting the number L1 of the second comparison result in the N measurements by the adjusting value to obtain L2;
taking the ratio of the L2 to the second target number of times as the proportional value;
and when the proportional value is larger than a second preset threshold value, switching the main path of the user terminal from the MN to the SN.
4. The method of claim 2 or 3, wherein the ACK information is positively correlated with the adjustment value; the negatively correlating the NACK information with the adjustment value comprises:
when receiving the ACK information, the adjusting value is the sum of the adjusting value obtained at the previous time and the basic adjusting step length; wherein the basic adjustment step length is a target value bler of the error rate;
when NACK information is received, the adjusting value is the difference between the adjusting value obtained in the previous time and k times of basic adjusting step length; wherein the content of the first and second substances,
Figure FDA0002377459650000021
5. the method of claim 2 or 3, wherein the adjustment value corresponds to a value range of [ -1.5, 0.6 ].
6. A dual-connection main path switching device is characterized in that under a Long Term Evolution (LTE) and new air interface (NR) dual-connection EN-DC scene, the device comprises:
the measurement module is used for measuring the SRS receiving power of an uplink reference signal (SRS) of the user terminal at the NR side;
the comparison module is used for comparing the SRS receiving power with a preset SRS power threshold to obtain a comparison result; the comparison result comprises a first comparison result that the SRS receiving power is smaller than an SRS power low threshold and a second comparison result that the SRS receiving power is larger than an SRS power high threshold;
and the switching module is used for determining whether the user terminal switches the main path or not according to the main path configured by the main path parameter of the user terminal and the proportional value corresponding to the first comparison result or the second comparison result in the N times of measurement when the number of times of measurement reaches a preset number N.
7. The apparatus according to claim 6, wherein the primary path parameter is configured as a secondary node SN, and the switching module is specifically configured to determine an adjustment value according to ACK information and NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; adjusting the preset times N by using the adjusting value, wherein the adjusted first target times are obtained; taking a ratio of the number of times M1 that the first comparison result appears in the N measurements to the first target number of times as the proportional value; and when the proportional value is larger than a first preset threshold value, switching the main path of the user terminal from the SN to the MN.
8. The apparatus according to claim 6, wherein the primary path parameter is configured as a primary node MN, and the switching module is specifically configured to determine an adjustment value according to the ACK information and NACK information received in the N measurement processes; wherein the ACK information is positively correlated with the adjustment value; the NACK information is negatively correlated with the adjustment value; adjusting the preset times N by using the adjusting value to obtain adjusted second target times; adjusting the number L1 of the second comparison result in the N measurements by the adjusting value to obtain L2; taking the ratio of the L2 to the second target number of times as the proportional value; and when the proportional value is larger than a second preset threshold value, switching the main path of the user terminal from the MN to the SN.
9. A base station, comprising:
a memory to store instructions; and
a processor configured to execute the instructions, wherein the instructions, when executed, cause the base station to implement the method of any of claims 1-5.
10. A storage medium on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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