CN111050364B - Switching management method for 5G ultra-dense network - Google Patents

Switching management method for 5G ultra-dense network Download PDF

Info

Publication number
CN111050364B
CN111050364B CN201911163951.XA CN201911163951A CN111050364B CN 111050364 B CN111050364 B CN 111050364B CN 201911163951 A CN201911163951 A CN 201911163951A CN 111050364 B CN111050364 B CN 111050364B
Authority
CN
China
Prior art keywords
terminal
switching
delay
handover
state
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911163951.XA
Other languages
Chinese (zh)
Other versions
CN111050364A (en
Inventor
张守武
王凤丽
袁春经
田霖
石晶林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kunshan Zhongke Jingshang Information Technology Co.,Ltd.
Original Assignee
Beijing Sylincom Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Sylincom Technology Co ltd filed Critical Beijing Sylincom Technology Co ltd
Publication of CN111050364A publication Critical patent/CN111050364A/en
Application granted granted Critical
Publication of CN111050364B publication Critical patent/CN111050364B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a switching management method for a 5G ultra-dense network, which comprises the following steps: starting an inactive timer for a terminal in a connection state without uplink and downlink data transmission, wherein the time is stopped when the terminal is detected to have uplink and downlink data transmission; under the condition that the inactivity timer is not overtime, determining whether the terminal has a switching requirement; responding to a switching requirement of the terminal, and judging whether the non-active timer stops timing or not; under the condition that the inactive timer does not stop timing, carrying out switching processing or state conversion processing on the terminal according to the data arrival probability of the terminal before the inactive timer is overtime, the switching cost of the terminal and the state conversion cost; and under the condition that the inactive timer stops timing, performing switching processing or state conversion processing on the terminal according to the switching cost and the state conversion cost of the terminal. The embodiment of the invention avoids unnecessary switching and reduces the switching times and the interruption time delay in the 5G ultra-dense network.

Description

Switching management method for 5G ultra-dense network
Technical Field
The invention relates to the technical field of mobile communication, in particular to a switching management method for a 5G ultra-dense network.
Background
The 5G Ultra Dense Network (UDN) obtains a larger cell splitting gain through high-density base station deployment, and achieves higher spectral efficiency and capacity than LTE, and the RRC states (i.e., radio resource control states) of the 5G include an Idle state (RRC Idle), a Connected state (RRC Connected), and an Inactive state (RRC Inactive), where in the Idle state and the Inactive state, the terminal completes mobility management through cell selection/reselection, and in the Connected state, the terminal assists the base station in performing a cell handover process to complete mobility management.
High density deployment of base stations presents a number of problems, for example, increased frequency of handovers and increased chance of handover failures due to the smaller transmit power and coverage area of a single base station. Most of the research at present is directed to a scenario in which there is traffic transmission around a terminal, and the number of handovers is reduced and the handover failure rate is reduced by adjusting parameters related to the handover. However, in the case of a complicated network environment of a 5G ultra-dense network, adjusting parameters is only helpful for improving the handover success rate, and the handover times cannot be effectively reduced. In addition, the parameters are adjusted to switch in advance to ensure low failure rate of switching, and ping-pong switching is easily caused, so that the switching frequency is higher.
In addition to the above parameter adjustment scheme, researchers also propose a handover management scheme to reduce the number of handovers and the handover failure rate. The handover management scheme includes: when the base station/terminal detects that the terminal in the connection state does not transmit uplink and downlink data (or uplink and downlink services), an inactive timer is started for the terminal; if the terminal still has no uplink or downlink data transmission when the inactivity timer expires, the terminal will transition from the Connected state (RRC Connected) to the Inactive state (RRC Inactive). As shown in fig. 1, if the quality of the wireless channel between the terminal and the base station is degraded and is lower than the handover threshold after the inactivity timer is started and before the inactivity timer expires, the base station performs a handover process on the terminal, and the terminal then accesses a cell with better wireless quality. However, the following problems exist in such a scenario: after the handover process is performed, the new base station may start the inactivity timer again, and if the terminal does not have uplink and downlink data transmission, the inactivity timer may be over, and then the terminal transitions to an inactive state. Obviously, this handover is unnecessary and would bring a lot of unnecessary signalling processing to the access network. If the handover fails in the handover process, the re-establishment process initiated by the terminal will also bring more signaling processing and resource allocation operations, resulting in a larger interruption delay for the terminal.
Disclosure of Invention
In order to solve the above problems in the prior art, according to an embodiment of the present invention, there is provided a handover management method for a 5G ultra-dense network, including: starting an inactive timer for a terminal in a connection state without uplink and downlink data transmission, wherein the time is stopped when the terminal is detected to have uplink and downlink data transmission; responding to the switching requirement of the terminal, and judging whether the non-active timer stops timing; under the condition that the inactive timer does not stop timing, performing switching processing or state conversion processing on the terminal according to the data arrival probability of the terminal before the inactive timer is overtime, the switching cost of the terminal and the state conversion cost of the terminal; and under the condition that the inactive timer stops timing, performing switching processing or state conversion processing on the terminal according to the switching cost of the terminal and the state conversion cost of the terminal.
In the above method, when the inactivity timer does not stop counting, performing handover processing or state transition processing on the terminal according to the data arrival probability of the terminal before the inactivity timer expires, the handover cost of the terminal, and the state transition cost of the terminal includes: counting the arrival rate of the historical data of the terminal, and predicting the data arrival probability of the terminal before the expiration of the inactivity timer according to the counted arrival rate of the historical data; comparing the data arrival probability of the terminal before the inactivity timer expires with a predetermined threshold; under the condition that the data arrival probability of the terminal before the non-active timer is overtime is larger than a preset threshold value, comparing the switching cost of the terminal with the state transition cost of the terminal, if the switching cost of the terminal is smaller than the state transition cost of the terminal, performing switching processing on the terminal, and otherwise, switching the terminal to a non-activated state; and under the condition that the data arrival probability of the terminal before the inactivity timer is overtime is less than or equal to a preset threshold value, converting the terminal into an inactive state.
The above method may further comprise: after the inactivity timer stops timing, detecting whether the terminal has uplink and downlink data transmission and is in a connected state, and restarting the inactivity timer in response to detecting that the terminal has no uplink and downlink data transmission and is in the connected state; and after the switching processing is finished, detecting whether the terminal has uplink and downlink data transmission and is in a connection state, and restarting the inactivity timer in response to detecting that the terminal has no uplink and downlink data transmission and is in the connection state.
The above method may further comprise: determining whether the inactivity timer has expired; under the condition that the inactivity timer is determined not to be overtime, determining whether the terminal has a switching requirement; transitioning the terminal to an inactive state if it is determined that the inactivity timer has expired. Wherein determining whether the terminal has a handover requirement comprises: receiving a measurement report reported by the terminal; and determining whether the terminal has a switching requirement according to the measurement report reported by the terminal.
The method may further include predicting a data arrival probability of the terminal before the inactivity timer expires according to:
Figure BDA0002286907800000031
wherein, PT' represents a data arrival probability of the terminal before the inactivity timer expires; e is the base number of the natural logarithm function; λ represents a historical data arrival rate of the terminal; t is t0Indicating the moment when the terminal is determined to have a switching requirement; t represents the time at which the inactivity timer expires.
The above method may further comprise: counting the switching failure rate in a preset time period, and calculating the interruption time delay of successful switching and the interruption time delay of failed switching; calculating the average interruption time delay of the switching according to the following formula as the switching cost of the terminal:
TAIL＝(1-P)*THIL+P*THFIL，
wherein, TAILRepresents the average interrupt latency of the handover; p represents the counted handover failure rate; t isHILAn interrupt delay indicating a successful handover; t isHFILAn interruption delay indicating a handover failure.
In the above method, the interrupt delay of successful handover is calculated according to the following formula:
THIL＝delayRA+0.5*RTT，
and calculating the interruption time delay of the switching failure according to the following formula:
THFIL＝delayRA+6.5*RTT，
wherein, THILAn interrupt delay indicating a successful handover; t isHFILAn interrupt delay indicating a handover failure; delayRARepresenting a random access delay; RTT represents the wireless transmission round trip delay.
The method may further include calculating an interruption delay of the state transition as a state transition cost of the terminal according to the following equation:
TCD＝delayRA+RTT，
wherein, TCDAn interrupt latency representing a state transition; delayRARepresenting a random access delay; RTT represents the wireless transmission round trip delay.
The above method may further comprise: for the terminal in the inactive state, detecting whether the terminal has uplink and downlink data transmission; and responding to the detection that the terminal has uplink and downlink data transmission, and converting the terminal into a connection state.
The embodiment of the invention has the following beneficial effects:
the possibility of the timeout of the inactivity timer is judged by predicting the data arrival probability of the terminal before the expiration of the inactivity timer. If the predicted data arrival probability is less than or equal to the predetermined threshold, the terminal is judged to have low possibility that corresponding data arrives at the base station before the inactivity timer is overtime, namely the probability of the inactivity timer being overtime is high, and the terminal is switched from the connection state to the inactivity state in advance aiming at the situation, so that unnecessary switching is avoided. In addition, if the predicted data arrival probability is greater than the predetermined threshold, that is, the terminal has a high possibility that corresponding data arrives at the base station before the inactivity timer expires (the probability of the inactivity timer expiring is low), or the terminal is not in the inactivity detection process (that is, the terminal has uplink and downlink data transmission), the average interruption time delay of the switching and the interruption time delay of the state transition are compared, the terminal is subjected to switching processing when the average interruption time delay of the switching is less than the interruption time delay of the state transition, otherwise, the state transition processing is performed, so that the interruption time delay of the terminal is reduced, and a lower interruption time delay can be obtained even when the wireless environment is poor.
In summary, the embodiment of the present invention avoids unnecessary handover, reduces the number of handovers and the interruption time delay in a 5G super-dense network, and therefore reduces the handover failure rate and the larger interruption time delay caused by the terminal initiating the reestablishment process when the handover fails.
Drawings
Example embodiments will be described in detail with reference to the accompanying drawings, which are intended to depict example embodiments and should not be construed as limiting the intended scope of the claims. The drawings are not to be considered as drawn to scale unless explicitly indicated.
FIG. 1 illustrates a flow diagram of an existing handoff management scheme according to one embodiment of the present invention;
fig. 2 shows a flow diagram of a handover management method for a 5G ultra-dense network according to one embodiment of the invention;
FIG. 3 shows a schematic diagram of an inactivity detection process in accordance with one embodiment of the invention;
FIG. 4 shows a signaling flow diagram for handover success according to one embodiment of the present invention;
FIG. 5 illustrates a signaling flow diagram for a handover failure according to one embodiment of the present invention;
fig. 6 shows a signaling flow diagram for state transitions according to one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
When studying cell switching in a 5G ultra-dense network, the inventors found that, for a certain terminal in a Connected state (RRC Connected), if there is a small probability that corresponding data (or traffic) reaches a base station, the terminal can be directly switched from the Connected state (RRC Connected) to an Inactive state (RRC Inactive) to avoid unnecessary cell switching processing (hereinafter, simply referred to as switching processing), and the terminal can quickly return to the Connected state (RRC Connected) from the Inactive state (RRC Connected) without causing too high interruption delay; if the probability of the corresponding data reaching the base station is very high, the switching processing or the state conversion processing is selected according to the comparison result by comparing the switching interruption time delay with the state conversion interruption time delay, so that the lower interruption time delay can be obtained. In view of the above, according to an embodiment of the present invention, a handover management method for a 5G ultra-dense network is provided.
Fig. 2 schematically shows a flow diagram of a handover management method for a 5G ultra-dense network according to an embodiment of the present invention, which may be implemented at the base station side. In the method, for a terminal in a Connected state (RRC Connected) without uplink and downlink data transmission, a base station may start an inactivity timer (or referred to as an inactivity timer) for the terminal; in the timing process of the inactivity timer, the terminal is in the inactivity detection process; when detecting that the terminal has uplink and downlink data transmission, the inactivity timer stops timing, and the terminal is not in an inactivity detection process; subsequently, when detecting that the terminal has no uplink and downlink data transmission and is in a connected state again, the base station may restart the inactivity timer for the terminal. The steps of the handover management method for 5G ultra-dense networks will be described in detail below with reference to fig. 2:
step S1, under the condition that the inactive timer is not overtime, determining whether a terminal in a connection state (RRC Connected) has a switching requirement, if the terminal has the switching requirement, executing step S2, otherwise, waiting until the terminal is determined to have the switching requirement or the inactive timer is overtime; in the case where the inactivity timer times out, step S7 is executed (in step S7, the terminal is transitioned from the connected state to the inactive state).
According to an embodiment of the present invention, step S1 may include the following sub-steps:
and S11, determining whether the inactivity timer expires, and if not, performing S12, and if so, performing S7 (i.e., transitioning the terminal from the connected state to the inactive state).
After the base station starts the inactivity timer for the terminal, the inactivity timer starts to calculate the time elapsed since the start from zero, and if the elapsed time reaches a preset time period, the base station determines that the inactivity timer is overtime.
And S12, receiving a measurement report from the terminal, determining whether the terminal has a switching requirement according to the measurement report, executing S2 if the terminal has the switching requirement, and returning to S11 if the terminal does not have the switching requirement.
Generally, a terminal in a Connected state (RRC Connected) periodically performs related measurements according to a measurement configuration message sent by a base station, and sends a measurement report to the base station, where the measurement report may include measurement results of a serving cell (such as RSRP and RSRQ measurement values) and measurement results of neighboring cells (used by the base station to determine which cell to handover to before performing a handover process). Then, the base station receives the measurement report sent by the terminal, evaluates the measurement report to determine whether the quality of the wireless channel between the base station and the terminal is lower than a handover threshold, if so, determines that the terminal has a handover requirement and performs step S2, otherwise, returns to sub-step S11.
In the above embodiment, the terminal may periodically send a measurement report to the base station; in other embodiments, the terminal may also perform relevant measurement and send a measurement report to the base station when the reporting condition is satisfied.
S2, responding to the switching requirement of the terminal, determining whether the terminal is in the non-active detection process, if so, executing the step S3, otherwise, executing the step S5.
As described above, after the base station starts the inactivity timer for the terminal, when it is detected that the terminal has uplink and downlink data transmission, timing is stopped, and the terminal is not in the inactivity detection process after timing is stopped; thereafter, if it is detected again that the terminal does not transmit uplink and downlink data and the terminal is in a connected state, the base station may restart the inactivity timer for the terminal. In step S2, the base station determines whether or not the inactivity timer has stopped counting, determines that the terminal is in an inactivity detection procedure if the counting is not stopped, and performs step S3 (in step S3, it predicts a data arrival probability of the terminal before the inactivity timer expires), and determines that the terminal is not in an inactivity detection procedure if the counting is stopped, and performs step S5 (the reason why steps S3 to S4 are skipped is that the terminal has uplink and downlink data transmission, and thus, it is not necessary to perform an operation such as predicting a data arrival probability of the terminal before the inactivity timer expires).
And S3, responding to the terminal in the non-activity detection process, and predicting the data arrival probability of the terminal before the non-activity timer is overtime. The data arrival probability of the terminal before the inactivity timer expires refers to: probability that the corresponding data (traffic) of the terminal reaches the base station before the inactivity timer expires at the present time (i.e., the time at which the handover requirement of the terminal is determined).
According to one embodiment of the present invention, step S3 includes the following sub-steps:
and S31, counting the historical data arrival rate of the terminal by the base station. That is, the probability that the corresponding data of the terminal will arrive at the base station within a past period of time (e.g., a period of time before the time at which the terminal is determined to have a handover need) is counted by the base station.
And S32, predicting the data arrival probability of the terminal before the expiration of the inactivity timer by the base station according to the following formula:
Figure BDA0002286907800000073
wherein, PT' represents the data arrival probability of the terminal before the expiration of the inactivity timer, e is the base number of a natural logarithm function, lambda is the historical data arrival rate of the terminal counted by the base station, t0Indicating the moment when the terminal is determined to have a switching requirement; t denotes the time at which the inactivity timer expires.
The derivation of equation (1) is as follows:
assuming that the process of the corresponding data of the terminal arriving at the base station is a Poisson flow, t is0(i.e., the time at which it is determined that the terminal has a handover need) to T (i.e., the time at which the inactivity timer of the terminal expires) (T)0And T) is divided into n parts as shown in FIG. 3. Note that the resulting time interval is Δ t:
Figure BDA0002286907800000071
the probability that the terminal has corresponding data to arrive at the base station in each time interval Δ t is expressed as follows:
PΔt＝λ*Δt (3)
where λ represents a historical data arrival rate of the terminal.
According to equation (3), the probability that the terminal has no corresponding data to reach the base station in each time interval Δ t can be expressed as follows:
PΔt'＝1-λ*Δt (4)
on the basis of the public display (4), at the time T, the probability that the terminal has no corresponding data to reach the base station is as follows:
PT＝(PΔt')n＝(1-λ*Δt)n (5)
substituting equation (2) into equation (5) yields:
Figure BDA0002286907800000072
it will be appreciated by those skilled in the art that when n tends to infinity, i.e., n → ∞, the following formula can be obtained:
Figure BDA0002286907800000081
where e is the base of the natural logarithm function.
When n tends to infinity, the probability that the terminal has no corresponding data to reach the base station at time T can be obtained according to equations (6) and (7):
Figure BDA0002286907800000082
according to equation (8), the probability that the terminal has corresponding data to reach the base station at time T, i.e. equation (1), i.e. the probability that the terminal has data to reach before the inactivity timer expires, can be obtained.
S4, comparing the data arrival probability of the terminal before the timeout of the inactivity timer with a preset threshold value PthresholdIf the data arrival probability of the terminal before the time-out of the inactivity timer is larger than a predetermined threshold value PthresholdThen, step S5 is executed, otherwise step S7 is executed (in step S7, the terminal is shifted to the inactive state).
In step S4, when the predicted data arrival probability of the terminal before the inactivity timer expires is equal to or less than a predetermined threshold PthresholdMeanwhile, the probability that the terminal has corresponding data to reach the base station before the inactivity timer expires is considered to be small, and thus the terminal does not need to be subjected to cell handover processing, but rather, state transition processing of the terminal is performed (see step S7).
And S5, comparing the average interruption time delay of the switching with the interruption time delay of the state transition, if the average interruption time delay of the switching is smaller than the interruption time delay of the state transition, executing the step S6 (in the step S6, performing switching processing on the terminal), otherwise executing the step S7.
According to one embodiment of the present invention, step S5 includes the following sub-steps:
and S51, counting the switching failure rate in the past period of time.
The base station may count the handover failure rate and obtain the handover failure rate P for a period of time (e.g., for one hour) before calculating the average interruption delay of the handover.
And S52, calculating the interrupt time delay of successful switching.
Fig. 4 schematically shows a signaling flow diagram of successful handover according to an embodiment of the present invention, as shown in fig. 4, when the handover is successful, the interruption delay mainly relates to a process of performing random access and an uplink reconfiguration to a target base station (e.g., the target gNB shown in fig. 4) after a terminal (e.g., the UE shown in fig. 4) receives a reconfiguration message. Based on this, the interruption time delay T of successful switchingHILSatisfies the relationship shown in the following formula:
THIL≥delayRA+0.5*RTT (9)
wherein, RTT (Round-Trip Time) represents the Round-Trip delay of wireless transmission, delayRAIndicating the random access delay.
The left side and the right side of the formula (9) can be equal, namely T, under the conditions of not considering the processing time of the terminal and the network side, the link delay between the base station and the core network and assuming that the base station is an ideal backhaul linkHIL＝delayRA+0.5 RTT to calculate the interruption time delay T for successful handoverHIL。
And S53, calculating the interruption time delay of the switching failure.
Fig. 5 schematically shows a signaling flow diagram of handover failure according to an embodiment of the present invention, and as shown in fig. 5, when handover fails, the interruption delay mainly relates to a random access procedure, an RRC reestablishment procedure, and an uplink reestablishment procedure for the terminal to reestablish. Interruption time delay T of switching failureHFILSatisfies the relationship shown in the following formula:
THFIL≥delayRA+6.5*RTT (10)
wherein, RTT (Round-Trip Time) represents the Round-Trip delay of wireless transmission, delayRAIndicating the random access delay.
Similar to the calculation of the interruption delay of successful handover, the left and right sides of the equation (10) can be made equal, i.e., T, without considering the processing time of the terminal and the network side, the delay of the link between the base station and the core network, and assuming that the base station is an ideal backhaul linkHFIL＝delayRA+6.5 Round Trip Time (RTT) to calculate the interruption time delay T of the failed handoverHFIL。
And S54, calculating the average interruption time delay of the switching, wherein the average interruption time delay of the switching can also be regarded as the switching cost of the terminal.
The base station may calculate the average interruption delay for the handover according to:
TAIL＝(1-P)*THIL+P*THFIL (11)
wherein, TAILRepresents the average interrupt latency of the handover; p is the handover failure rate counted by the base station in sub-step S51; t isHILAn interrupt delay indicating a successful handover; t isHFILAn interruption delay indicating a handover failure.
And S55, calculating the interruption time delay of the state transition, wherein the interruption time delay of the state transition can also be regarded as the state transition cost of the terminal.
Fig. 6 is a signaling flow diagram schematically illustrating state transition according to an embodiment of the present invention, and as shown in fig. 6, when the terminal is in an Inactive state (RRC Inactive) and is disconnected from the source base station, and then returns to a Connected state (RRC Connected), a random access procedure is required. When the access base station is replaced by the terminal, the access base station (e.g., target gNE shown in fig. 6) requests the context of the terminal from the previous serving base station (e.g., source gNE shown in fig. 6), and the terminal receives an RRC Connection Resume and then completes the access. Based on this, the interruption time delay T of the state transitionCDSatisfies the relationship shown in the following formula:
TCD≥delayRA+RTT (12)
wherein, RTT (Round-Trip Time) represents the Round-Trip delay of wireless transmission, delayRAIndicating the random access delay.
Similar to the calculation of the interruption delay of the handover success/failure, the left and right sides of the equation (12), i.e., T, can be made equal without considering the processing time of the terminal and the network side, the delay of the link between the base station and the core network, and assuming that the base station is an ideal backhaul linkCD＝delayRA+ RTT to calculate the interrupt delay T of state transitionCD。
Substep S56. compare average interruption time delay T of switchingAILInterrupt delay T with state transitionCDIf the average interruption time delay T of the handoverAILInterrupt latency T less than state transitionCDThen, step S6 is performed (in step S6, the terminal is subjected to the handover process), otherwise, step S7 is performed (in step S7, the terminal is subjected to the state transition process).
S6, switching the terminal; after the handover process is completed, in response to detecting that the terminal has no uplink and downlink data transmission and is in a Connected state (RRC Connected), the inactivity timer is restarted for the terminal, and if the inactivity timer expires, step S7 is executed.
Specifically, the base station determines a target cell according to a measurement report reported by the terminal (the base station usually selects a cell with better radio quality), and sends a handover request to the corresponding target base station to perform handover processing. After the handover process is completed, the new base station (i.e., the target base station) restarts the inactivity timer for the terminal when detecting that the terminal has no uplink and downlink data transmission and is in a connected state, and determines whether the inactivity timer has timed out, and if not, does not perform other operations, and if so, performs step S7.
And S7, converting the terminal from the Connected state (RRC Connected) to the non-activated state (RRC Inactive). Subsequently, for a terminal in an Inactive state (RRC Inactive), detecting whether the terminal has uplink and downlink data (service) transmission; in response to detecting that the terminal has uplink and downlink data transmission (i.e., traffic), the terminal is transitioned from the Inactive state (RRC Inactive) to the Connected state (i.e., RRC Connected), and returns to step S1. It will be understood by those skilled in the art that if the terminal is to be transitioned from the Inactive state (RRC Inactive) to the Connected state (i.e., RRC Connected), a state transition command may be initiated by the base station or a state recovery request may be initiated by the terminal to bring the terminal back to the Connected state quickly.
In the above embodiment, the possibility of the inactivity timer expiring is determined by predicting the data arrival probability of the terminal before the inactivity timer expires. If the predicted data arrival probability is less than or equal to the predetermined threshold, the terminal is judged to have low possibility that corresponding data arrives at the base station before the inactivity timer is overtime, namely the probability of the inactivity timer being overtime is high, and the terminal is switched from the connection state to the inactivity state in advance aiming at the situation, so that unnecessary switching is avoided. In addition, if the predicted data arrival probability is greater than the predetermined threshold, that is, the terminal has a high possibility that corresponding data arrives at the base station before the inactivity timer expires (the probability of the inactivity timer expiring is low), or the terminal is not in the inactivity detection process (that is, the terminal has uplink and downlink data transmission), the average interruption time delay of the switching and the interruption time delay of the state transition are compared, the terminal is subjected to switching processing when the average interruption time delay of the switching is less than the interruption time delay of the state transition, otherwise, the state transition processing is performed, so that the interruption time delay of the terminal is reduced, and a lower interruption time delay can be obtained even when the wireless environment is poor.
In step S6 of the foregoing embodiment, after the terminal is switched, in response to detecting that the terminal has no uplink and downlink data transmission and is in a connected state, the terminal restarts the inactivity timer, and if the inactivity timer expires, step S7 is executed; in another embodiment, the step S1 may be returned to directly after restarting the inactivity timer for the terminal.
It should be noted that some exemplary methods are depicted as flowcharts. Although a flowchart may describe the operations as being performed serially, it can be appreciated that many of the operations can be performed in parallel, concurrently, or with synchronization. In addition, the order of the operations may be rearranged. A process may terminate when an operation is completed, but may have additional steps not included in the figure or embodiment.
The above-described methods may be implemented by hardware, software, firmware, middleware, pseudocode, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware, or pseudo code, the program code or code segments to perform the tasks may be stored in a computer readable medium such as a storage medium, and a processor may perform the tasks.
It should be appreciated that the software-implemented exemplary embodiment is typically encoded on some form of program storage medium or implemented over some type of transmission medium. The program storage medium may be any non-transitory storage medium such as a magnetic disk (e.g., a floppy disk or a hard drive) or an optical disk (e.g., a compact disk read only memory or "CD ROM"), and may be read only or random access. Similarly, the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.

Claims (10)

1. A handover management method for a 5G ultra-dense network comprises the following steps:
starting an inactive timer for a terminal in a connection state without uplink and downlink data transmission, wherein the time is stopped when the terminal is detected to have uplink and downlink data transmission;
responding to the switching requirement of the terminal, and judging whether the non-active timer stops timing;
predicting the data arrival probability of the terminal before the time of the non-active timer is over under the condition that the non-active timer does not stop timing, comparing the data arrival probability of the terminal before the time of the non-active timer is over with a preset threshold value, carrying out switching processing or state conversion processing on the terminal according to the switching cost of the terminal and the state conversion cost of the terminal under the condition that the data arrival probability of the terminal before the time of the non-active timer is over is larger than the preset threshold value, and converting the terminal into the non-active state under the condition that the data arrival probability of the terminal before the time of the non-active timer is over is smaller than or equal to the preset threshold value; wherein performing the handover processing or the state transition processing on the terminal according to the handover cost of the terminal and the state transition cost of the terminal includes: comparing the switching cost of the terminal with the state transition cost of the terminal, if the switching cost of the terminal is less than the state transition cost of the terminal, performing switching processing on the terminal, otherwise, switching the terminal to an inactive state;
and under the condition that the inactive timer stops timing, performing switching processing or state conversion processing on the terminal according to the switching cost of the terminal and the state conversion cost of the terminal.
2. The method according to claim 1, wherein in a case where the inactivity timer does not stop counting, a historical data arrival rate of the terminal is counted, and a data arrival probability of the terminal before the inactivity timer expires is predicted according to the counted historical data arrival rate.
3. The method according to claim 1 or 2, wherein the method further comprises:
after the inactivity timer stops timing, detecting whether the terminal has uplink and downlink data transmission and is in a connected state, and restarting the inactivity timer in response to detecting that the terminal has no uplink and downlink data transmission and is in the connected state;
and after the switching processing is finished, detecting whether the terminal has uplink and downlink data transmission and is in a connection state, and restarting the inactivity timer in response to detecting that the terminal has no uplink and downlink data transmission and is in the connection state.
4. The method according to claim 1 or 2, wherein the method further comprises:
determining whether the inactivity timer has expired;
under the condition that the inactivity timer is determined not to be overtime, determining whether the terminal has a switching requirement;
transitioning the terminal to an inactive state if it is determined that the inactivity timer has expired.
5. A method according to claim 1 or 2, wherein the method comprises predicting a data arrival probability of the terminal before the inactivity timer expires according to:
Figure FDA0003307312050000021
wherein, PT' represents a data arrival probability of the terminal before the inactivity timer expires; e is the base number of the natural logarithm function; λ represents a historical data arrival rate of the terminal; t is t0Indicating the moment when the terminal is determined to have a switching requirement; t represents the time at which the inactivity timer expires.
6. The method according to claim 1 or 2, wherein the method further comprises:
counting the switching failure rate in a preset time period, and calculating the interruption time delay of successful switching and the interruption time delay of failed switching;
calculating the average interruption time delay of the switching according to the following formula as the switching cost of the terminal:
TAIL＝(1-P)*THIL+P*THFIL，
wherein, TAILRepresents the average interrupt latency of the handover; p represents the counted handover failure rate; t isHILAn interrupt delay indicating a successful handover; t isHFILAn interruption delay indicating a handover failure.
7. The method of claim 6, wherein the interrupt latency for successful handover is calculated according to:
THIL＝delayRA+0.5*RTT，
and calculating the interruption time delay of the switching failure according to the following formula:
THFIL＝delayRA+6.5*RTT，
wherein, THILAn interrupt delay indicating a successful handover; t isHFILAn interrupt delay indicating a handover failure; delayRARepresenting a random access delay; RTT represents the wireless transmission round trip delay.
8. The method according to claim 1 or 2, wherein the method further comprises calculating an interruption delay of a state transition as a state transition cost of the terminal according to:
TCD＝delayRA+RTT，
wherein, TCDAn interrupt latency representing a state transition; delayRARepresenting a random access delay; RTT represents the wireless transmission round trip delay.
9. The method according to claim 1 or 2, wherein the method further comprises:
for the terminal in the inactive state, detecting whether the terminal has uplink and downlink data transmission;
and responding to the detection that the terminal has uplink and downlink data transmission, and converting the terminal into a connection state.
10. The method of claim 4, wherein determining whether the terminal has a handover need comprises:
receiving a measurement report reported by the terminal;
and determining whether the terminal has a switching requirement according to the measurement report reported by the terminal.
CN201911163951.XA 2019-01-29 2019-11-25 Switching management method for 5G ultra-dense network Active CN111050364B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910085438 2019-01-29
CN2019100854387 2019-01-29

Publications (2)

Publication Number Publication Date
CN111050364A CN111050364A (en) 2020-04-21
CN111050364B true CN111050364B (en) 2021-12-21

Family

ID=70233834

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911163951.XA Active CN111050364B (en) 2019-01-29 2019-11-25 Switching management method for 5G ultra-dense network

Country Status (1)

Country Link
CN (1) CN111050364B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112887921B (en) * 2021-01-23 2022-02-01 深圳市智开科技有限公司 Method and equipment for reducing packet loss during switching of WAPI CPE (wireless local area network interface) equipment between APs (access points)
CN114051287B (en) * 2021-09-28 2023-06-20 浪潮软件科技有限公司 Terminal connection time distribution method and system
CN114301921B (en) * 2021-12-28 2024-04-30 中国电信股份有限公司 Network node control method, device, storage medium and electronic equipment
CN114301555B (en) * 2022-01-04 2023-06-16 烽火通信科技股份有限公司 Channel switching method, device, equipment and readable storage medium
CN117412396A (en) * 2022-07-05 2024-01-16 上海推络通信科技合伙企业(有限合伙) Method and apparatus in a communication node for wireless communication
CN117042071A (en) * 2023-09-28 2023-11-10 新华三技术有限公司 Mobility management method, device and equipment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012066011A1 (en) * 2010-11-15 2012-05-24 Research In Motion Limited Managing communications across a wireless network
WO2012065915A1 (en) * 2010-11-15 2012-05-24 Research In Motion Limited Managing wireless communications
CN104683029A (en) * 2014-12-15 2015-06-03 北京邮电大学 Vertical handover method for heterogeneous networking of VLC (Visible Light Communication)
CN105933940A (en) * 2016-05-24 2016-09-07 安徽科技学院 Seamless handover method based on collaborative base station clustering in ultra-dense network
CN108123923A (en) * 2016-11-30 2018-06-05 北京中科晶上科技股份有限公司 A kind of Convergence gateway for supporting a variety of communication technologys
CN108156620A (en) * 2018-01-30 2018-06-12 东南大学 A kind of super-intensive network small station dormancy method based on channel and queue aware
CN108337702A (en) * 2017-12-25 2018-07-27 中国电子科技集团公司第七研究所 A kind of wireless switching acceptance controlling method based on switching historical information statistics

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8995394B2 (en) * 2012-06-15 2015-03-31 Amazon Technologies, Inc. System for fast dormancy on wireless networks
US8971194B2 (en) * 2012-10-29 2015-03-03 At&T Intellectual Property I, L.P. Controlling wireless transition timers based on application and content

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012066011A1 (en) * 2010-11-15 2012-05-24 Research In Motion Limited Managing communications across a wireless network
WO2012065915A1 (en) * 2010-11-15 2012-05-24 Research In Motion Limited Managing wireless communications
CN104683029A (en) * 2014-12-15 2015-06-03 北京邮电大学 Vertical handover method for heterogeneous networking of VLC (Visible Light Communication)
CN105933940A (en) * 2016-05-24 2016-09-07 安徽科技学院 Seamless handover method based on collaborative base station clustering in ultra-dense network
CN108123923A (en) * 2016-11-30 2018-06-05 北京中科晶上科技股份有限公司 A kind of Convergence gateway for supporting a variety of communication technologys
CN108337702A (en) * 2017-12-25 2018-07-27 中国电子科技集团公司第七研究所 A kind of wireless switching acceptance controlling method based on switching historical information statistics
CN108156620A (en) * 2018-01-30 2018-06-12 东南大学 A kind of super-intensive network small station dormancy method based on channel and queue aware

Also Published As

Publication number Publication date
CN111050364A (en) 2020-04-21

Similar Documents

Publication Publication Date Title
CN111050364B (en) Switching management method for 5G ultra-dense network
US9622139B2 (en) Method for improving handover performance in a cellular wireless communication system
EP3796711A1 (en) Handover method and apparatus
US11490303B2 (en) Cell handover method and apparatus, RRC reestablishment method and apparatus, storage medium and user equipment
CA2943412C (en) Mobility robustness optimization in a cellular network
CN105637930B (en) Method and apparatus for controlling handover in mobile communication system
RU2671951C2 (en) Electronic apparatus in wireless communications system and mobility measurement method
EP2740295A1 (en) Method and apparatus for mobile terminal connected mode mobility
CN104322104A (en) Classifying failure reports as either current or stale for mobility robustness optimization adjustments
KR101831952B1 (en) Method and apparatus for handover
WO2016095549A1 (en) Method and device for applying cell connection establishment failure report, and storage medium
CN110831081B (en) Switching information reporting method, switching robustness optimizing method, switching information reporting device, switching robustness optimizing device, storage medium, user equipment and base station
WO2021088270A1 (en) Mobility optimization method and related apparatus
KR20140018776A (en) Method and apparatus for adjusting mobility parameter
WO2013044884A1 (en) Radio connection reestablishment method, user equipment and enb
US11736996B2 (en) Conditional handover method and apparatus
CN112584552B (en) Method for recovering radio link failure, user equipment and base station
CN116803120A (en) Prediction in a distributed network
CN112291803B (en) Communication method, terminal equipment and computer readable storage medium
KR102247314B1 (en) Method and apparatus for recovering radio link failure in mobile communication system
KR102023370B1 (en) Method and apparatus for set neighbor in mobile communication system
WO2011088637A1 (en) Method and system for cell selection and handover in relay network
WO2023040787A1 (en) Cell handover method and communication apparatus
WO2024017237A1 (en) Method executed by user equipment, and user equipment
WO2024094056A1 (en) Information reporting method and user equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20220615

Address after: Room 1208, complex south building, room 9, No. 1699, Zuchongzhi South Road, Yushan Town, Kunshan City, Suzhou City, Jiangsu Province 215300

Patentee after: Kunshan Zhongke Jingshang Information Technology Co.,Ltd.

Address before: 100190 No. 10 South Road, Haidian District Academy of Sciences, Beijing

Patentee before: BEIJING SYLINCOM TECHNOLOGY CO.,LTD.