CN111757531A - Random access backspacing method and device - Google Patents
Random access backspacing method and device Download PDFInfo
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- CN111757531A CN111757531A CN201910239731.4A CN201910239731A CN111757531A CN 111757531 A CN111757531 A CN 111757531A CN 201910239731 A CN201910239731 A CN 201910239731A CN 111757531 A CN111757531 A CN 111757531A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
Abstract
The embodiment of the invention provides a random access backoff method and a random access backoff device. The method comprises the following steps: detecting that the random access of the UE fails, measuring the current channel occupancy rate, and determining a preset first backoff time value corresponding to the channel occupancy rate; acquiring a current Radio Resource Control (RRC) establishment reason, and determining a preset priority parameter corresponding to the RRC establishment reason; and randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism by using the target Backoff parameter value. The embodiment of the invention solves the problem of the Backoff mechanism in the prior art.
Description
Technical Field
The embodiment of the invention relates to the technical field of mobile communication, in particular to a random access backoff method and a random access backoff device.
Background
In mobile communication systems, in order to meet the higher demand of available frequency Bands for future 5G communication networks, 3GPP organizations have confirmed that on the basis of using conventional licensed frequency spectrum, 5G Unlicensed frequency spectrum (NR-U) will be used in 5G networks, such as frequency Bands below 7GHz, frequency Bands below 7-52.6GHz, and/or frequency Bands above 52.6GHz, etc.; the NR-U is used by means of technologies such as Massive MIMO (Massive MIMO), high-frequency communication and beam forming in a 5G network, so that the shortage of authorized spectrum is made up, and the transmission efficiency and the coverage range are improved.
In NR-U unlicensed spectrum operation, the Backoff (Backoff) mechanism of the random access procedure is as follows: if a terminal (User Equipment, UE) receives a MAC PDU subframe (MAC sub PDU) of a Backoff Indicator (BI), and the value is equal to a BI value in the MAC sub PDU, the UE stores a BI-specified Backoff value; otherwise the UE sets the backoff value to 0.
The BI specifies a time range (see section 7.2 of the MAC layer protocol specification 38.321) that the UE needs to wait before retransmitting the preamble. Specifically, if the UE fails to access in the random access process, a Backoff mechanism is triggered, and after waiting for a period of time, the UE initiates random access again, where the waiting time is a random value selected by the UE within a waiting time interval specified by a numerical value from 0 to BI.
Currently, the Backoff mechanism has two disadvantages.
On the one hand, in NR-U, if a scheme similar to NR is adopted, the BI value is configured for all UEs receiving Random Access Response (RAR) messages; if channel sensing (Listen Before Talk, LBT), transmission of an RAR message in the network may be delayed, and if the RAR message is not received or contention resolution fails, once a channel is available, multiple UEs may send preambles at the same time to cause collision. In the NR-U unlicensed spectrum operation, since the channel is shared, when the UE and the network side transmit a message using the channel, it needs to monitor whether the channel is available, which is called as LBT. In the NR-U contention random access process, the UE needs to perform LBT operation first, and then send the preamble after obtaining an available channel.
On the other hand, the BI value should be related to the channel occupancy: when the channel occupancy rate is high, a larger backoff value should be set; when the channel occupancy rate is low, a smaller backoff value should be set; in addition, due to the hidden node effect, the channel occupancy measured by the network may be different from the channel occupancy measured by the UE.
Disclosure of Invention
The embodiment of the invention provides a random access Backoff method and a random access Backoff device, which are used for solving the problems of the prior art that a Backoff mechanism exists.
In one aspect, an embodiment of the present invention provides a random access backoff method, which is applied to a terminal UE, and the method includes:
detecting that the random access of the UE fails, measuring the current channel occupancy rate, and determining a preset first backoff time value corresponding to the channel occupancy rate;
acquiring a current Radio Resource Control (RRC) establishment reason, and determining a preset priority parameter corresponding to the RRC establishment reason;
and randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism by using the target Backoff parameter value.
In one aspect, an embodiment of the present invention provides a random access backoff device, which is applied to a terminal UE, and the device includes:
the measuring module is used for detecting the random access failure of the UE, measuring the current channel occupancy rate and determining a preset first backoff time value corresponding to the channel occupancy rate;
the determining module is used for acquiring the current radio resource control RRC establishment reason and determining a preset priority parameter corresponding to the RRC establishment reason;
and the execution module is used for randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism according to the target Backoff parameter value.
On the other hand, the embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program stored on the memory and executable on the processor, where the processor implements the steps in the fallback method for random access when executing the program.
In still another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the fallback method for random access described above.
According to the random access backoff method and device provided by the embodiment of the invention, when the random access failure of the UE is detected, a first backoff time value is correspondingly determined based on the channel occupancy rate by measuring the current channel occupancy rate, then the current RRC establishment reason is obtained, and the preset priority parameter is determined based on the RRC establishment reason; and finally, randomly selecting a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism according to the target Backoff parameter value. The UE measures the occupancy rate of the channel by itself, so that the hidden node is prevented from influencing the decision-making back-off time of the UE, the priority of the service is distinguished by the RRC establishment reason, a target backoff parameter value is reasonably selected based on the priority of the service and the occupancy rate of the channel, and the problem that under the condition of high load, when the channel is available once, a plurality of UEs attempt to send msg1 at the same time to cause collision is avoided; meanwhile, the embodiment of the invention also leads the high-priority service to be accessed into the channel before the low-priority service, thereby improving the robustness of the competitive random access of the NR-U system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a backoff method for random access according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a random access backoff method according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a backoff device for random access according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a server according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "an embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase "in an embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Fig. 1 shows a flowchart of a backoff method for random access according to an embodiment of the present invention.
As shown in fig. 1, a random access backoff method provided in the embodiment of the present invention is applied to a terminal UE, and the method specifically includes the following steps:
The random access procedure refers to a procedure from when the UE sends a random access preamble (preamble) to try to access the network to when a basic signaling connection is established with the network. Specifically, after the random access procedure is initiated, if the UE does not receive the RAR message within the RAR time window, or the received RAPID of the RAR message does not have a preamble that matches itself, or receives an indication message indicating that the collision resolution fails, the random access procedure is considered to fail.
And when the random access failure is detected, measuring the current channel occupancy rate. The channel occupancy rate reflects the quality of the current network to a certain extent, and due to the effect of hidden nodes, the channel occupancy condition measured by the network may be different from the channel occupancy condition measured by the UE; therefore, the current channel occupancy is measured by the UE.
In the embodiment of the invention, the corresponding first backoff time values are preset in the channel occupancy rates, and the first backoff time values corresponding to different channel occupancy rates are different, so that the situation that a smaller first backoff time value is set for the UE under the condition of high channel occupancy rate to cause contention conflict is avoided.
Wherein, Radio Resource Control (RRC) is mainly used to allocate Radio resources and send signaling; for example, the control signaling between the UE and the access network is mainly an RRC message, which carries all parameters required for establishing, modifying, and releasing protocol entities of the layer and the physical layer, and also carries some signaling of a Non-access stratum (NAS). When the UE initiates connection establishment in an Idle state (Idle) or initiates RRC connection recovery in an Inactive state (Inactive), an RRC layer provides an RRC establishment cause (RRC _ estipaliment _ cause) to the UE.
For example, the 3GPP 5G standard text (Rel-15, 2018-12) has supported the following cause values: "emergency", "highpriority Access", "mt-Access", "mo-Signalling", "mo-Data", "mo-VoiceCall", "mo-VideoCall", "mo-SMS", "mps-priority Access" and "mcs-priority Access".
Each RRC establishment reason corresponds to a preset priority parameter for identifying the current priority degree of the service determined based on the RRC establishment reason, and the Backoff time of different RRC establishment reasons is adjusted through the preset priority parameter.
And 103, randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism by using the target Backoff parameter value.
The second back-off time value is a preset value, and may be 0 millisecond (ms) or other values. After the first Backoff time value is determined in step 101, randomly selecting a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, and then multiplying the Backoff parameter value by a preset priority parameter to obtain a final target Backoff parameter value, wherein the preset priority parameter can be understood as a scaling factor of the initial Backoff parameter value; and executing the Backoff mechanism with the target Backoff parameter value when the rollback operation is started.
In the above embodiment of the present invention, when a UE random access failure is detected, a first backoff time value is determined based on the channel occupancy by measuring the current channel occupancy; then acquiring a current RRC establishment reason, and determining a preset priority parameter based on the RRC establishment reason; and finally, randomly selecting a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism according to the target Backoff parameter value. The UE measures the occupancy rate of the channel by itself, so that the hidden node is prevented from influencing the decision-back time of the UE, the priority of the service is distinguished by the RRC establishment reason, a target backoff parameter value is reasonably selected based on the service priority and the occupancy rate of the channel, and the problem that under the condition of high load, when the channel is available once, a plurality of UEs attempt to send msg1 at the same time to cause collision is avoided; meanwhile, the embodiment of the invention also leads the high-priority service to be accessed into the channel before the low-priority service, thereby improving the robustness of the competitive random access of the NR-U system. The embodiment of the invention solves the problem of the Backoff mechanism in the prior art.
Referring to fig. 2, another embodiment of the present invention provides a random access backoff method applied to a terminal UE, where the method includes the following steps:
The random access process refers to a process from when the UE sends a random access preamble to try to access the network to before a basic signaling connection is established with the network. Specifically, after the random access procedure is initiated, if the UE does not receive the RAR message within the RAR time window, or the received RAPID of the RAR message does not have a preamble that matches itself, or receives an indication message indicating that the collision resolution fails, the random access procedure is considered to fail.
Wherein, the several scenarios of random access failure correspond to different failure types.
Specifically, in the embodiment of the present invention, the step of determining the failure type of the UE random access failure includes:
if a random access preamble identifier RAPID matched with a preamble of the UE exists in a random access response RAR message received by the UE and the RAR carries a backoff indication BI value, determining that a failure type of the UE random access failure is a first type;
otherwise, determining the failure type of the UE random access failure as a second type.
Wherein a Backoff Indicator (BI) value is used to indicate a current second Backoff time value.
The second type includes: if the UE does not receive the Random Access Response (RAR) message, the UE does not receive the RAR message in the RAR time window, or the RAPID of the received RAR message does not have a condition which is consistent with the preamble of the UE, or the UE receives an indication of the failure of solving the random access conflict issued by the network side.
Wherein the different failure types correspond to different second back-off time values. Specifically, in this embodiment of the present invention, the step of determining the second backoff time value corresponding to the failure type includes:
when the failure type is the first type, determining that a corresponding second back-off time value is a preset back-off time corresponding to a back-off indication BI value;
and/or
And when the failure type is the second type, determining that the corresponding second back-off time value is a preset time value.
Wherein, according to the protocol specification of the MAC layer, each rollback indication BI value corresponds to a preset rollback time.
The preset time value may be 0ms or any other preset value.
The channel occupancy rate reflects the quality of the current network to a certain extent, and due to the effect of hidden nodes, the channel occupancy condition measured by the network may be different from the channel occupancy condition measured by the UE; therefore, the current channel occupancy is measured by the UE. In the embodiment of the invention, the corresponding first backoff time values are preset in the channel occupancy rates, and the first backoff time values corresponding to different channel occupancy rates are different, so that the situation that a smaller first backoff time value is set for the UE under the condition of high channel occupancy rate to cause contention conflict is avoided.
The RRC is mainly used for allocating radio resources and sending signaling; the control signaling between the UE and the access network is mainly RRC messages, which carry all parameters required for establishing, modifying, and releasing protocol entities of the layer and the physical layer, and also carry some signaling of the NAS layer. When the UE initiates connection establishment in an Idle state (Idle) or initiates RRC connection recovery in an Inactive state (Inactive), the RRC layer provides an RRC establishment cause to the UE.
Each RRC establishment reason corresponds to a preset priority parameter and is used for identifying the current priority degree, namely the emergency degree, of the service determined based on the RRC establishment reasons, and the Backoff time of different RRC establishment reasons is adjusted through the preset priority parameter.
And step 205, randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism by using the target Backoff parameter value.
After the first Backoff time value is determined, randomly selecting a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the Backoff parameter value by a preset priority parameter to obtain a final target Backoff parameter value, executing a Backoff mechanism by using the target Backoff parameter value when the Backoff operation is started, namely selecting a time value between 0 and the target Backoff parameter value as final Backoff time, and restarting a random process after waiting the Backoff time.
Optionally, in the foregoing embodiment of the present invention, the step of measuring the current channel occupancy includes:
acquiring a current Received Signal Strength Indicator (RSSI);
and carrying out preset sampling processing on the RSSI, and determining the percentage of the RSSI in the sampled data higher than a preset threshold, wherein the percentage is the current channel occupancy rate.
Among them, the Received Signal Strength Indication (RSSI) is an optional part of the wireless transmission layer, and is used to determine the link quality and whether to increase the broadcast transmission Strength. The UE obtains sampling data by measuring RSSI and carrying out preset sampling processing on the RSSI; and determining the channel occupancy rate by calculating the percentage of RSSI in the sampled data higher than a preset threshold value.
That is to say, in the embodiment of the present invention, the channel occupancy is determined based on the RSSI measurement result reported by the current UE physical layer, the RRC layer processes the obtained RSSI sampling value through an L3 window, and counts the percentage of RSSI that is greater than a certain threshold, thereby obtaining the channel occupancy.
Optionally, in the foregoing embodiment of the present invention, the step of determining the preset first backoff time value corresponding to the channel occupancy includes:
determining an occupancy rate gear to which the channel occupancy rate belongs, and determining a preset first return time value corresponding to the occupancy rate gear; wherein each of the occupancy gears corresponds to a continuous duty cycle; and different occupancy gear positions correspond to different preset first return time values.
The value of the occupancy rate gear is not limited, for example, the occupancy rate gear may be 10 gears, and each occupancy rate gear corresponds to a continuous occupancy rate; and different occupancy gears correspond to different preset first retraction time values, for example, the first retraction time values corresponding to 10 gears are respectively 5, 10, 20, 30, 40, 60, 80, 120, 160, and 240, and the unit is ms.
As a first example, referring to table 1, table 1 shows a partial mapping relationship between occupancy and occupancy gear, first rollback time value.
Table 1:
in addition, the above mapping relationship can be implemented in the following two ways:
(1) the mapping relation can be modified by configuring the System Information Block (SIB) or RRC dedicated message to the UE, and the configuration is flexible;
(2) the UE is written in a hard coding mode, the mapping relation is static, the mode is simple to operate, and dynamic modification is not supported.
Optionally, in the foregoing embodiment of the present invention, the step of obtaining the current RRC establishment cause and determining a preset priority parameter corresponding to the RRC establishment cause includes:
acquiring a current Radio Resource Control (RRC) establishment reason from an RRC layer;
determining a preset priority parameter corresponding to the priority gear according to the priority gear to which the RRC establishment reason belongs; and different priority gears correspond to different preset priority parameters.
Each RRC establishment reason corresponds to a priority gear, different priority gears correspond to different preset priority parameters, the preset priority parameters are used for identifying the current priority degree, namely the emergency degree, of the service determined based on the RRC establishment reasons, and the Backoff time of different RRC establishment reasons is adjusted through the preset priority parameters.
As a second example, see table 2 below, where table 2 shows a partial correspondence between RRC establishment cause, priority level, and preset priority parameter:
table 2:
some specific examples of embodiments of the present invention are described below with reference to tables 1 and 2:
the third example:
the random access response RAPID matched with the preamble of the UE exists in the RAR message received by the UE, and the BI parameter is carried in the RAR.
In this scenario, uplink Data of the UE arrives and uplink synchronization is required, so the random access cause value is "mo-Data" and the corresponding random access priority is 3.
Meanwhile, the UE measures the channel occupancy rate to be 0.5. In the last random access attempt, the received RAR message has RAPID consistent with the preamble sent by the RAR message, and the RAR message has BIMAC subPDU.
And the UE records the BI value in the RAR, and indexes the corresponding Backoff time to be 40ms according to the MAC layer protocol table. Since the contention resolution fails in the fourth step, the random access needs to be restarted after waiting for backoff time. The target Backoff parameter value in this scenario is determined as follows:
(1) obtaining a second backoff time value backoff _ x as 40ms based on the BI indication in the RAR;
(2) obtaining a first backoff time value based on the channel occupancy measured by the UE: backoff _ y is 60 ms;
(3) based on the access priority 3, the obtained preset priority parameter as the BI scaling factor is 0.8;
(4) obtaining a target Backoff parameter value:
Backoff＝0.8*max(40,60)＝48ms
after the random access of the UE fails, a value is randomly selected between 0ms and 48ms, and the random process is reinitiated after waiting for corresponding time.
The fourth example:
the UE did not successfully receive the RAR message.
In this scenario, after the UE successfully sends the preamble, the network side fails to successfully send the RAR message due to LBT failure, and therefore the UE does not successfully receive the RAR message within the RAR receiving window, and therefore the random access procedure needs to be initiated again. The access reason value of the UE is 'authentication', and the corresponding access priority is 1. The UE measured the channel occupancy of 0.8. The target Backoff parameter value in this scenario is determined as follows:
(1) since the RAR message is not received, backoff _ x is 0 ms;
(2) obtaining backoff _ y as 320ms based on the channel occupancy rate of 0.8 measured by the UE;
(3) based on the access priority being 1, the obtained BI scaling factor is 0.2;
(4) obtaining a target Backoff parameter value:
Backoff＝0.2*max(0,320)＝64ms
and after the random access of the UE fails, randomly selecting a value between 0 and 64ms, and restarting a random process after waiting for corresponding time.
A fifth example:
the RAR received by the UE does not carry BI.
In this example, when the UE receives that the RAR does not carry the Backoff indicator, the Backoff _ x is 0ms, and the processing mechanism is as in the fourth example, and is not described herein again.
A sixth example:
in the RAR received by the UE, there is no MAC RAR Protocol Data Unit (PDU) subframe matching its preamble.
In this example, the UE receives the RAR message, but does not have the mac RAR subppdu matching its preamble, and considers that the RAR is invalid, so that the backoff _ x is 0ms, as in the fourth example, and is not described herein again.
In the above embodiment of the present invention, when a UE random access failure is detected, a current channel occupancy rate is measured, a first backoff time value is determined based on the channel occupancy rate, then a current RRC establishment cause is obtained, and a preset priority parameter is determined based on the RRC establishment cause; and finally, randomly selecting a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism according to the target Backoff parameter value. The UE measures the occupancy rate of the channel by itself, so that the hidden node is prevented from influencing the decision-making back-off time of the UE, the priority of the service is distinguished by the RRC establishment reason, a target backoff parameter value is reasonably selected based on the priority of the service and the occupancy rate of the channel, and the problem that under the condition of high load, when the channel is available once, a plurality of UEs attempt to send msg1 at the same time to cause collision is avoided; meanwhile, the embodiment of the invention also leads the high-priority service to be accessed into the channel before the low-priority service, thereby improving the robustness of the competitive random access of the NR-U system.
The random access backoff method provided in the embodiment of the present invention is described above, and a random access backoff device provided in the embodiment of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 3, an embodiment of the present invention provides a backoff device for random access, which is applied to a terminal UE, and the device includes:
a measuring module 301, configured to detect that the UE fails to perform random access, measure the current channel occupancy rate, and determine a preset first backoff time value corresponding to the channel occupancy rate.
The random access process refers to a process from when the UE sends a random access preamble to try to access the network to before a basic signaling connection is established with the network. Specifically, after the random access procedure is initiated, if the UE does not receive the RAR message within the RAR time window, or the received RAPID of the RAR message does not have a preamble that matches itself, or receives an indication message indicating that collision resolution fails, the RACH procedure is considered to be failed.
And when the random access failure is detected, measuring the current channel occupancy rate. The channel occupancy rate reflects the quality of the current network to a certain extent, and due to the effect of hidden nodes, the channel occupancy condition measured by the network may be different from the channel occupancy condition measured by the UE; therefore, the current channel occupancy is measured by the UE. In the embodiment of the invention, the corresponding first backoff time values are preset in the channel occupancy rates, and the first backoff time values corresponding to different channel occupancy rates are different, so that the situation that a smaller first backoff time value is set for the UE under the condition of high channel occupancy rate to cause contention conflict is avoided.
A determining module 302, configured to obtain a current radio resource control RRC establishment cause, and determine a preset priority parameter corresponding to the RRC establishment cause.
The RRC is mainly used for allocating radio resources and sending signaling; the control signaling between the UE and the access network is mainly RRC messages, which carry all parameters required for establishing, modifying, and releasing protocol entities of the layer and the physical layer, and also carry some signaling of the NAS layer. When the UE initiates connection establishment in an Idle state (Idle) or initiates RRC connection recovery in an Inactive state (Inactive), an RRC layer provides an RRC establishment cause (RRC estipalimentcause) to the UE.
For example, the 3GPP 5G standard text (Rel-15, 2018-12) has supported the following cause values: "emergency", "highpriority Access", "mt-Access", "mo-Signalling", "mo-Data", "mo-VoiceCall", "mo-VideoCall", "mo-SMS", "mps-priority Access" and "mcs-priority Access".
Each RRC establishment reason corresponds to a preset priority parameter and is used for identifying the current priority degree, namely the emergency degree, of the service determined based on the RRC establishment reasons, and the Backoff time of different RRC establishment reasons is adjusted through the preset priority parameter.
And the executing module 303 is configured to randomly select a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiply the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and execute a Backoff mechanism with the target Backoff parameter value.
The second back-off time value is a preset value, and may be 0 millisecond (ms) or other values. After the first Backoff time value is determined, randomly selecting a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the Backoff parameter value by a preset priority parameter to obtain a final target Backoff parameter value, executing a Backoff mechanism by using the target Backoff parameter value when the Backoff operation is started, namely selecting a time value between 0 and the target Backoff parameter value as final Backoff time, and restarting a random process after waiting the Backoff time.
Optionally, in the above embodiment of the present invention, the apparatus further includes:
a type determining module, configured to determine a failure type of the UE random access failure;
a second determining module, configured to determine a second backoff time value corresponding to the failure type.
Optionally, in the foregoing embodiment of the present invention, the type determining module is configured to:
if a random access preamble identifier RAPID matched with a preamble of the UE exists in a random access response RAR message received by the UE and the RAR carries a backoff indication BI value, determining that a failure type of the UE random access failure is a first type;
otherwise, determining the failure type of the UE random access failure as a second type.
Optionally, in the foregoing embodiment of the present invention, the second determining module is configured to:
when the failure type is the first type, determining that a corresponding second back-off time value is a preset back-off time corresponding to a back-off indication BI value;
and/or
And when the failure type is the second type, determining that the corresponding second back-off time value is a preset time value.
Optionally, in the foregoing embodiment of the present invention, the measurement module 301 includes:
the RSSI acquisition submodule is used for acquiring the RSSI of the current received signal strength indication;
and the sampling submodule is used for carrying out preset sampling processing on the RSSI and determining the percentage of the RSSI in the sampling data higher than a preset threshold, wherein the percentage is the current channel occupancy rate.
Optionally, in the foregoing embodiment of the present invention, the measurement module 301 includes:
the first determining submodule is used for determining the occupancy rate gear to which the channel occupancy rate belongs and determining a preset first return time value corresponding to the occupancy rate gear; wherein each of the occupancy gears corresponds to a continuous duty cycle; and different occupancy gear positions correspond to different preset first return time values.
Optionally, in the foregoing embodiment of the present invention, the determining module 302 includes:
the RRC acquisition submodule is used for acquiring the current RRC establishment reason from the RRC layer;
the gear determining submodule is used for the second obtaining submodule and is used for determining a preset priority parameter corresponding to the priority gear according to the priority gear to which the RRC establishment reason belongs; and different priority gears correspond to different preset priority parameters.
In the above embodiment of the present invention, when detecting that the UE has failed in random access, the measurement module 301 measures the current channel occupancy rate, determines the first backoff time value based on the channel occupancy rate, and the determination module 302 obtains the current RRC establishment cause and determines the preset priority parameter based on the RRC establishment cause; the execution module 303 randomly selects a time value between the second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplies the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executes a Backoff mechanism according to the target Backoff parameter value. The UE measures the occupancy rate of the channel by itself, so that the hidden node is prevented from influencing the decision-back time of the UE, the priority of the service is distinguished by the RRC establishment reason, a target backoff parameter value is reasonably selected based on the service priority and the occupancy rate of the channel, and the problem that under the condition of high load, when the channel is available once, a plurality of UEs attempt to send msg1 at the same time to cause collision is avoided; meanwhile, the embodiment of the invention also leads the high-priority service to be accessed into the channel before the low-priority service, thereby improving the robustness of the competitive random access of the NR-U system.
On the other hand, the embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program stored on the memory and executable on the processor, where the processor implements the steps in the fallback method for random access when executing the program.
For example, as follows, when the electronic device is a server, fig. 4 illustrates a physical structure diagram of the server.
As shown in fig. 4, the server may include: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. The processor 410 may call logic instructions in the memory 430 to perform the following method:
detecting that the random access of the UE fails, measuring the current channel occupancy rate, and determining a preset first backoff time value corresponding to the channel occupancy rate;
acquiring a current Radio Resource Control (RRC) establishment reason, and determining a preset priority parameter corresponding to the RRC establishment reason;
and randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism by using the target Backoff parameter value.
In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In still another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the fallback method for random access described above.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A backoff method of random access is applied to terminal UE, and is characterized in that the method comprises the following steps:
detecting that the random access of the UE fails, measuring the current channel occupancy rate, and determining a preset first backoff time value corresponding to the channel occupancy rate;
acquiring a current Radio Resource Control (RRC) establishment reason, and determining a preset priority parameter corresponding to the RRC establishment reason;
and randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism by using the target Backoff parameter value.
2. The method of claim 1, wherein after the step of detecting the UE random access failure, the method further comprises:
determining a failure type of the UE random access failure;
determining a second back-off time value corresponding to the failure type.
3. The method of claim 2, wherein the step of determining the failure type of the UE random access failure comprises:
if a random access preamble identifier RAPID matched with a preamble of the UE exists in a random access response RAR message received by the UE and the RAR carries a backoff indication BI value, determining that a failure type of the UE random access failure is a first type;
otherwise, determining the failure type of the UE random access failure as a second type.
4. The method of claim 3, wherein the step of determining the second back-off time value corresponding to the failure type comprises:
when the failure type is the first type, determining that a corresponding second back-off time value is a preset back-off time corresponding to a back-off indication BI value;
and/or
And when the failure type is the second type, determining that the corresponding second back-off time value is a preset time value.
5. The method of claim 1, wherein the step of measuring the current occupancy of the channel comprises:
acquiring a current Received Signal Strength Indicator (RSSI);
and carrying out preset sampling processing on the RSSI, and determining the percentage of the RSSI in the sampled data higher than a preset threshold, wherein the percentage is the current channel occupancy rate.
6. The method of claim 1, wherein the step of determining the preset first backoff time value corresponding to the duty cycle comprises:
determining an occupancy rate gear to which the channel occupancy rate belongs, and determining a preset first return time value corresponding to the occupancy rate gear; wherein each of the occupancy gears corresponds to a continuous duty cycle; and different occupancy gear positions correspond to different preset first return time values.
7. The method according to claim 1, wherein the step of obtaining the current RRC establishment cause and determining the preset priority parameter corresponding to the RRC establishment cause comprises:
acquiring a current Radio Resource Control (RRC) establishment reason from an RRC layer;
determining a preset priority parameter corresponding to the priority gear according to the priority gear to which the RRC establishment reason belongs; and different priority gears correspond to different preset priority parameters.
8. A backoff device for random access, applied to a terminal UE, is characterized in that the device comprises:
the measuring module is used for detecting the random access failure of the UE, measuring the current channel occupancy rate and determining a preset first backoff time value corresponding to the channel occupancy rate;
the determining module is used for acquiring the current radio resource control RRC establishment reason and determining a preset priority parameter corresponding to the RRC establishment reason;
and the execution module is used for randomly selecting a time value between a preset second Backoff time value and the first Backoff time value as an initial Backoff parameter value, multiplying the initial Backoff parameter value by the preset priority parameter to obtain a target Backoff parameter value, and executing a Backoff mechanism according to the target Backoff parameter value.
9. An electronic device comprising a memory, a processor, a bus and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the fallback method for random access according to any one of claims 1 to 7 when executing the program.
10. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that: the program, when executed by a processor, implements the steps in a fallback method for random access according to any one of claims 1 to 7.
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