CN108235346B - Method and device for monitoring inactive UE in LTE system - Google Patents
Method and device for monitoring inactive UE in LTE system Download PDFInfo
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- CN108235346B CN108235346B CN201611200931.1A CN201611200931A CN108235346B CN 108235346 B CN108235346 B CN 108235346B CN 201611200931 A CN201611200931 A CN 201611200931A CN 108235346 B CN108235346 B CN 108235346B
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Abstract
The invention provides a method and a device for monitoring inactive UE in a base station of an LTE system, wherein the method comprises the following steps: a, estimating the occupation of an uplink buffer of the UE according to the obtained input data corresponding to the UE; b, when the occupation of the uplink buffer zone and the occupation of the uplink throughput, the downlink throughput and the downlink buffer of the UE are all zero, starting an inactivity timer; c determining the UE as an inactive UE when the inactivity timer expires. According to the scheme of the invention, the accuracy of the monitoring result of the inactive UE can be greatly improved, and the QoS of the user can be ensured.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for monitoring an inactive UE in an LTE system.
Background
Inactive UE (user equipment) monitoring is an important feature in wireless communication systems, if a connected UE is monitored as being data inactive, the resources occupied by the UE can be released for other UEs to optimize radio resource utilization, and the UE can be considered inactive only if both uplink (Up Link, UL) and downlink (Down Link, DL) meet the inactivity criterion.
In the related art, in a UMTS (Universal Mobile Telecommunications System) System, a 3GPP (3rd Generation Partnership Project) protocol supports traffic measurement, that is, a NodeB RRC (Radio Resource Control) can easily determine whether a UE is in an inactive state based on a traffic measurement report from the UE RRC and a NodeB user plane. However, in the LTE system (the LTE system includes LTE and its subsequent upgrade system), although eNB (evolved Node B, evolved base station) RRC can still determine whether UE downlink is in an inactive state based on eNB user plane traffic measurement report, since 3GPP does not support traffic measurement report in protocol in the LTE system, eNB cannot easily know whether UE uplink is in an inactive state.
Currently, typical solutions for inactive UE monitoring in LTE systems are: the eNB uses RLC (Radio Link Control) uplink throughput received from MAC (Media Access Control) as a measure for uplink inactivity monitoring, uses downlink throughput and downlink buffer occupancy as a measure for downlink inactivity monitoring, and when the uplink throughput, the downlink throughput and the downlink buffer occupancy of the UE are all zero, the base station will start an inactivity timer and determine the UE as an inactive UE when the inactivity timer expires; the inactivity timer is stopped if one of the three metrics is no longer zero. This solution may lead to inaccurate uplink inactivity monitoring results, thus making the monitoring results of inactive UEs less accurate, e.g. a UE with uplink buffer occupancy but with zero uplink throughput for various reasons, such as not being scheduled, according to the above solution the user will be considered uplink inactive, which is clearly unreasonable as the UE has data to send, which should not be considered uplink inactive, otherwise the QoS of the user will be reduced (Quality of Service).
Disclosure of Invention
An object of the present invention is to provide a method and apparatus for monitoring an inactive UE in an LTE system to more accurately determine whether the UE is really in an inactive state.
According to an aspect of the present invention, there is provided a method for monitoring an inactive UE in a base station of an LTE system, wherein the method comprises:
a, estimating the occupation of an uplink buffer of the UE according to the obtained input data corresponding to the UE;
b, when the occupation of the uplink buffer zone and the occupation of the uplink throughput, the downlink throughput and the downlink buffer of the UE are all zero, starting an inactivity timer;
c determining the UE as an inactive UE when the inactivity timer expires.
According to another aspect of the present invention, there is also provided an apparatus for monitoring an inactive UE in a base station of an LTE system, wherein the apparatus comprises:
a first estimating device, configured to estimate uplink buffer occupancy of the UE according to the obtained input data corresponding to the UE;
starting means for starting an inactivity timer when the uplink buffer occupancy and the uplink throughput, the downlink throughput, and the downlink buffer occupancy of the UE are all zero;
means for determining that the UE is an inactive UE when the inactivity timer expires.
According to another aspect of the present invention, there is also provided a base station for monitoring an inactive UE in an LTE system, the base station including the apparatus for monitoring an inactive UE of the present invention.
Compared with the prior art, the invention has the following advantages: the uplink buffer occupation of the UE is introduced into an LTE system as a measurement factor when the UE is inactive to monitor, whether an inactivity timer is started is determined by judging whether the uplink buffer occupation, the uplink throughput, the downlink throughput and the downlink buffer of the UE are all zero or not, so as to further determine whether the UE is the inactive UE or not, so that the accuracy of the monitoring result of the inactive UE can be greatly improved, the UE with the uplink buffer occupation can be effectively prevented from being determined as the inactive UE due to the fact that the uplink throughput is zero, the radio resource utilization rate and the system performance are greatly improved, and meanwhile the QoS of a user can be ensured.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flowchart illustrating a method for monitoring an inactive UE in a base station of an LTE system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of input data corresponding to a UE obtained by a base station according to an example of the present invention;
fig. 3 is a flowchart illustrating a context release procedure of an inactive UE according to an example of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for monitoring an inactive UE in a base station of an LTE system according to an embodiment of the present invention.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
While the exemplary embodiments are susceptible to various modifications and alternative forms, certain embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intention to limit example embodiments to the specific forms disclosed, but on the contrary, example embodiments are to cover all modifications, equivalents, and alternatives falling within the scope of the claims. Like reference numerals refer to like elements throughout the description of the various figures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
The term "wireless device" or "device" as used herein may be considered synonymous with and sometimes hereinafter referred to as: a client, user equipment, mobile station, mobile user, mobile terminal, subscriber, user, remote station, access terminal, receiver, mobile unit, etc., and may describe a remote user of wireless resources in a wireless communication network.
Similarly, the term "base station" as used herein may be considered synonymous with, and sometimes referred to hereinafter as: a node B, an evolved node B, an eNodeB, a Base Transceiver Station (BTS), an RNC, etc., and may describe a transceiver that communicates with and provides radio resources to a mobile in a wireless communication network that may span multiple technology generations. The base stations discussed herein may have all of the functionality associated with conventional well-known base stations, except for the ability to implement the methods discussed herein.
The methods discussed below, some of which are illustrated by flow diagrams, may be implemented by hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware or microcode, the program code or code segments to perform the necessary tasks may be stored in a machine or computer readable medium such as a storage medium. The processor(s) may perform the necessary tasks.
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent to", etc.) should be interpreted in a similar manner.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Portions of the exemplary embodiments and corresponding detailed description are presented in terms of software, or algorithms and symbolic representations of operations on data bits within a computer memory. These descriptions and representations are the ones by which those of ordinary skill in the art effectively convey the substance of their work to others of ordinary skill in the art. An algorithm, as the term is used here, and as it is used generally, is conceived to be a self-consistent sequence of steps leading to a desired result. The steps are those requiring physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of optical, electrical, or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated. It has proven convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like.
In the following description, the illustrative embodiments will be described with reference to acts and symbolic representations of operations (e.g., in the form of flowcharts) that can be implemented as program modules or functional processes including routines, programs, objects, components, data structures, etc., that perform particular tasks or implement particular abstract data types and that can be implemented using existing hardware at existing network elements. Such existing hardware may include one or more Central Processing Units (CPUs), Digital Signal Processors (DSPs), application specific integrated circuits, Field Programmable Gate Arrays (FPGAs) computers, and the like.
It should be recognized that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise, or as is apparent from the discussion, terms such as "processing," "computing," "determining," or "displaying" or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical, electronic quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.
It should also be noted that the software implemented aspects of the exemplary embodiments are typically encoded on some form of program storage medium or implemented over some type of transmission medium. The program storage medium may be a magnetic (e.g., floppy disk or hard drive) or optical (e.g., compact disk read only memory or "CD ROM") storage medium, and may be a read only or random access storage medium. Similarly, the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The exemplary embodiments are not limited by these aspects of any given implementation.
The processor and memory may operate together to perform device functions. For example, the memory may store code segments relating to the functionality of the device. The code segments may in turn be executed by a processor. In addition, the memory may store processing variables and constants for use by the processor.
The present invention is described in further detail below with reference to the attached drawing figures.
Fig. 1 is a flowchart illustrating a method for monitoring an inactive UE in a base station of an LTE system according to an embodiment of the present invention. The method of this embodiment is mainly implemented by a base station in an LTE system, wherein the LTE system of the present invention includes an LTE (Long Term Evolution) system and a subsequent upgrade system thereof, such as an LTE-a (LTE-Advanced, LTE-evolved) system, a 5G (fifth generation mobile communication technology) system, and the like.
The method of the present embodiment includes step S1, step S2, and step S3.
In step S1, the base station estimates the uplink buffer occupancy of the UE according to the obtained input data corresponding to the UE.
Wherein the input data comprises any input obtained by the base station relating to buffer occupancy of the UE. Preferably, the input data comprises input from at least one of: call processing; UL MAC control plane and user plane; an RLC user plane; a RACH (Random Access Channel) decoder; a PUCCH (Physical Uplink Control Channel) decoder; a PUSCH (Physical Uplink Shared Channel) decoder; DL MAC.
Fig. 2 is a schematic diagram of input data corresponding to a UE obtained by a base station according to an example of the present invention, where the input data includes RAB (Radio Access Bearer) parameters (such as GBR) from Call Processing (Call Processing), Resource request (Resource request) from a RACH decoder or a PUCCH decoder, buffer increment prediction (buffer increment prediction) from DL MAC, scheduling grants (scheduling grants) from a UL scheduler (including a static and/or dynamic scheduler), a buffer status report (buffer status report) from a MAC UL user plane, and a MAC data reception notification (MAC data reception notification) (where the MAC UL user plane determines the MAC data reception notification by combining data from the UL user plane and a result reported by the RLC decoder).
The uplink buffer occupancy represents an estimation of the UE uplink buffer Data size by the base station side, and the uplink buffer occupancy can reflect Data that can be used for transmission in a UE UL RLC SDU (Service Data Unit) buffer, that is, Data that has not been scheduled by any other HARQ (Hybrid Automatic Repeat reQuest) process. It should be noted that the uplink buffer occupancy does not take into account the data already waiting for HARQ feedback, which means that in case of HARQ failure, the uplink buffer occupancy of the UE needs to be estimated again.
Specifically, the base station estimates the size of the uplink buffer data of the UE according to all the obtained input data corresponding to the UE, so as to obtain the uplink buffer occupancy of the UE.
Preferably, the input data includes a buffer status recently reported by the UE and received by the base station, and the step S1 further includes steps S11 and S12.
In step S11, the base station estimates and updates the filtered UE buffer result according to the buffer status recently reported by the UE.
Specifically, the base station estimates the filtered UE cache result according to the buffer state recently reported by the UE, and updates the UE cache result before filtering at the base station side to the newly estimated filtered UE cache result.
Preferably, the base station estimates the filtered UE buffering result according to the buffer status and based on the following formula:
Fn＝(1-α)*Fn-1+α*Mn
wherein, FnRepresenting the UE buffer result after the filtering at the base station side, Fn-1Representing the UE buffer results before base station side filtering, MnRepresenting the buffer status recently reported by the UE and alpha representing the filter coefficient (also called forgetting factor). Wherein, when the buffer status reported by the UE is received for the first time, F is set0Is set as M1。
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner for estimating and updating the filtered UE buffer result according to the buffer status recently reported by the UE, for example, using the formula Fn＝(1-α)*Fn-1+w*α*Mn(where w is a predetermined adjustment factor) or other formulas for estimating the filtered UE buffer result, etc., are all included in the scope of the present invention.
In step S12, the base station estimates the uplink buffer occupancy of the UE according to the filtered UE buffer result and other input data except the buffer status.
Preferably, the base station estimates the uplink buffer occupancy of the UE according to the filtered UE buffering result and other input data except the buffer status based on the following formula:
ULBOSize(n+1)＝ULBOSize(n)-ScheduledSize(n)+Fn
wherein ULBOSize (n +1) represents an estimate of uplink buffer occupancy for the UE after base station side filtering, ULBOSize (n) represents an estimate of uplink buffer occupancy for the UE based on the other input data before base station side filtering, FnIndicating the filtered UE buffer result, and scheduledsize (n) indicating the scheduled or granted buffer size (i.e. the estimated scheduled or granted buffer occupancy).
The base station may update the estimated ULBOSize (n +1) based on the above formula every TTI (Transmission Time Interval), where the scheduled size (n) indicates the scheduled or granted buffer size of the TTI.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner for estimating the uplink buffer occupancy of the UE according to the filtered UE buffering result and other input data besides the buffer status, such as estimating the uplink buffer occupancy of the UE by using a simple variation of the above formula, etc., should be included in the scope of the present invention.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner for estimating the uplink buffer occupancy of the UE according to the obtained input data corresponding to the UE, such as estimating the uplink buffer occupancy of the UE by using a simple variation of the above formula, should be included in the scope of the present invention.
In step S2, the base station starts an inactivity timer when the uplink buffer occupancy and the uplink throughput, the downlink throughput, and the downlink buffer occupancy of the UE are all zero.
When the uplink buffer occupancy, the uplink throughput, the downlink throughput, and the downlink buffer of the UE are not all zero, the base station directly determines the UE as the active UE. That is, as long as one of the uplink buffer occupancy, the uplink throughput, the downlink throughput, and the downlink buffer of the UE is not zero, the UE will be determined as an active UE, and thus it can be determined more accurately whether the UE is really in an inactive state, so that the monitoring result of the inactive UE is more accurate.
In step S3, when the inactivity timer expires, the base station determines that the UE is an inactive UE.
Preferably, before the inactivity timer expires, when it is monitored that the uplink buffer occupancy, the uplink throughput, the downlink buffer occupancy, and the downlink throughput are not all zero, the base station stops the inactivity timer, i.e., determines the UE as an active UE.
Preferably, the method of this embodiment further comprises the steps of: when the UE is determined to be an inactive UE, the base station requests an MME (Mobile Management Entity) to trigger a Context Release (Context Release) process of the UE, so as to Release resources occupied by the UE, so that the released resources can be reused by other UEs.
Fig. 3 is a flowchart illustrating a context release procedure of an inactive UE according to an example of the present invention. When the UE is monitored as an inactive UE, the eNB sends S1AP a UE CONTEXT RELEASE REQUEST (CONTEXT RELEASE REQUEST) to the MME to REQUEST the MME to RELEASE the UE related logic S1 connection based on the reason (Cause) of "User inactivity" (i.e., set "Cause" to "User activity" in the S1AP UE CONTEXT RELEASE REQUEST message format); upon receiving the S1AP UE CONTEXT RELEASE request from the eNB, the MME will send S1AP UE CONTEXT RELEASE COMMAND (CONTEXT RELEASE COMMAND) to the eNB; after receiving S1AP UE context RELEASE command from MME, eNB will delete UE context and send RRC CONNECTION RELEASE (CONNECTION RELEASE) message to UE; thereafter, the eNB will feed back S1AP a UE CONTEXT RELEASE COMPLETE (CONTEXT RELEASE COMPLETE) message to the MME.
According to the scheme of the invention, the uplink buffer occupation of the UE is introduced into the LTE system as a measurement factor when the inactive UE is monitored, and whether the inactive timer is started or not is determined by judging whether the uplink buffer occupation, the uplink throughput, the downlink throughput and the downlink buffer of the UE are all zero or not so as to further determine whether the UE is the inactive UE or not.
Fig. 4 is a flowchart illustrating an apparatus for monitoring an inactive UE in a base station of an LTE system according to an embodiment of the present invention. The apparatus for monitoring inactive UEs (hereinafter simply referred to as "monitoring apparatus") comprises first estimating means 1, initiating means 2 and determining means 3.
The first estimation device 1 estimates the uplink buffer occupancy of the UE according to the obtained input data corresponding to the UE.
Wherein the input data comprises any input obtained by the base station relating to buffer occupancy of the UE. Preferably, the input data comprises input from at least one of: call processing; UL MAC control plane and user plane; an RLC user plane; a RACH decoder; a PUCCH decoder; a PUSCH decoder; DL MAC.
Fig. 2 is a schematic diagram of input data corresponding to a UE obtained by a base station according to an example of the present invention, where the input data includes RAB parameters (such as GBR) from call processing, resource requests from a RACH decoder or a PUCCH decoder, buffer increase prediction from a DL MAC, scheduling grant from a UL scheduler (including a static and/or dynamic scheduler), a buffer status report from a MAC UL user plane, and a MAC data reception notification (where the MAC UL user plane determines the MAC data reception notification by combining data from the RLC UL user plane and a demodulation result reported by a PUSCH decoder).
Wherein the uplink buffer occupancy represents an estimation of the UE uplink buffered data size by the base station side, which can reflect data available for transmission in the UE UL RLC SDU buffer, that is, data that has not been scheduled by any other HARQ process. It should be noted that the uplink buffer occupancy does not take into account the data already waiting for HARQ feedback, which means that in case of HARQ failure, the uplink buffer occupancy of the UE needs to be estimated again.
Specifically, the first estimation device 1 estimates the size of the uplink buffer data of the UE according to all the obtained input data corresponding to the UE, so as to obtain the uplink buffer occupancy of the UE.
Preferably, the input data includes a buffer status recently reported by the UE and received by the base station, and the first estimation device 1 further includes a second estimation device (not shown) and a third estimation device (not shown).
And the second estimation device estimates and updates the filtered UE cache result according to the buffer state recently reported by the UE.
Specifically, the second estimating device estimates the filtered UE cache result according to the buffer state recently reported by the UE, and updates the UE cache result before filtering at the base station side to the newly estimated filtered UE cache result.
Preferably, the second estimating means estimates the filtered UE buffer result according to the buffer status and based on the following formula:
Fn＝(1-α)*Fn-1+α*Mn
wherein, FnRepresenting the UE buffer result after the filtering at the base station side, Fn-1Representing the UE buffer results before base station side filtering, MnRepresenting the buffer status recently reported by the UE and alpha representing the filter coefficient (also called forgetting factor). Wherein, when the buffer status reported by the UE is received for the first time, F is set0Is set as M1。
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner for estimating and updating the filtered UE buffer result according to the buffer status recently reported by the UE, for example, using the formula Fn＝(1-α)*Fn-1+w*α*Mn(wherein w is a predetermined adjustment factor) or a combination thereofOther formulas for estimating the filtered UE buffer results, etc., are all included in the scope of the present invention.
And the third estimation device estimates the uplink buffer occupation of the UE according to the filtered buffering result of the UE and other input data except the buffer state.
Preferably, the third estimating device estimates the uplink buffer occupancy of the UE according to the filtered UE buffering result and other input data except the buffer status, and based on the following formula:
ULBOSize(n+1)＝ULBOSize(n)-ScheduledSize(n)+Fn
wherein ULBOSize (n +1) represents an estimate of uplink buffer occupancy for the UE after base station side filtering, ULBOSize (n) represents an estimate of uplink buffer occupancy for the UE based on the other input data before base station side filtering, FnIndicating the filtered UE buffer result, and scheduledsize (n) indicating the scheduled or granted buffer size (i.e. the estimated scheduled or granted buffer occupancy).
The third estimating means may update the estimated ULBOSize (n +1) at each TTI (Transmission Time Interval) based on the above formula, where the scheduled size (n) indicates the scheduled or granted buffer size of the TTI.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner for estimating the uplink buffer occupancy of the UE according to the filtered UE buffering result and other input data besides the buffer status, such as estimating the uplink buffer occupancy of the UE by using a simple variation of the above formula, etc., should be included in the scope of the present invention.
It should be noted that the above examples are only for better illustrating the technical solutions of the present invention, and not for limiting the present invention, and those skilled in the art should understand that any implementation manner for estimating the uplink buffer occupancy of the UE according to the obtained input data corresponding to the UE, such as estimating the uplink buffer occupancy of the UE by using a simple variation of the above formula, should be included in the scope of the present invention.
The starting means 2 starts the inactivity timer when the uplink buffer occupancy and the uplink throughput, the downlink throughput, and the downlink buffer occupancy of the UE are all zero.
When the uplink buffer occupancy, the uplink throughput, the downlink throughput, and the downlink buffer of the UE are not all zero, the base station directly determines the UE as the active UE. That is, as long as one of the uplink buffer occupancy, the uplink throughput, the downlink throughput, and the downlink buffer of the UE is not zero, the UE will be determined as an active UE, and thus it can be determined more accurately whether the UE is really in an inactive state, so that the monitoring result of the inactive UE is more accurate.
When the inactivity timer expires, the determining means 3 determines that the UE is an inactive UE.
Preferably, before the inactivity timer expires, when it is monitored that the uplink buffer occupancy, the uplink throughput, the downlink buffer occupancy, and the downlink throughput are not all zero, the base station stops the inactivity timer, i.e., determines the UE as an active UE.
Preferably, the monitoring apparatus of this embodiment further includes a requesting apparatus (not shown), and when it is determined that the UE is an inactive UE, the requesting apparatus requests the MME to trigger a context release procedure of the UE, so as to release the resource occupied by the UE, so that the released resource can be reused by other UEs.
Fig. 3 is a flowchart illustrating a context release procedure of an inactive UE according to an example of the present invention. When the UE is monitored as an inactive UE, the eNB sends S1AP a UE CONTEXT RELEASE REQUEST (CONTEXT RELEASE REQUEST) to the MME to REQUEST the MME to RELEASE the UE related logic S1 connection based on the reason (Cause) of "User inactivity" (i.e., set "Cause" to "User activity" in the S1AP UE CONTEXT RELEASE REQUEST message format); upon receiving the S1AP UE CONTEXT RELEASE request from the eNB, the MME will send S1AP UE CONTEXT RELEASE COMMAND (CONTEXT RELEASE COMMAND) to the eNB; after receiving S1AP UE context RELEASE command from MME, eNB will delete UE context and send RRC CONNECTION RELEASE (CONNECTION RELEASE) message to UE; thereafter, the eNB will feed back S1AP a UE CONTEXT RELEASE COMPLETE (CONTEXT RELEASE COMPLETE) message to the MME.
According to the scheme of the invention, the uplink buffer occupation of the UE is introduced into the LTE system as a measurement factor when the inactive UE is monitored, and whether the inactive timer is started or not is determined by judging whether the uplink buffer occupation, the uplink throughput, the downlink throughput and the downlink buffer of the UE are all zero or not so as to further determine whether the UE is the inactive UE or not.
It is noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, the various means of the invention may be implemented using Application Specific Integrated Circuits (ASICs) or any other similar hardware devices. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (13)
1. A method in a base station of an LTE system for monitoring inactive UEs, wherein the method comprises the steps of:
a, estimating the uplink buffer occupation of the UE according to the obtained input data corresponding to the UE, wherein the uplink buffer occupation represents the estimation of the uplink buffer data size of the UE by a base station side;
b, when the uplink buffer occupation and the uplink throughput, the downlink throughput and the downlink buffer occupation of the UE are all zero, starting an inactivity timer;
c determining the UE is an inactive UE when the inactivity timer expires;
wherein, the method also comprises:
stopping the inactivity timer when the uplink buffer occupancy, the uplink throughput, the downlink buffer occupancy, and the downlink throughput are not all zero as monitored before the inactivity timer expires, determining the UE as an active UE.
2. The method of claim 1, wherein the input data comprises input from at least one of:
call processing;
an uplink MAC control plane and a user plane;
an RLC user plane;
a RACH decoder;
a PUCCH decoder;
and a PUSCH decoder.
3. The method of claim 2, wherein the input data includes a buffer status recently reported by the UE, and the step a comprises the steps of:
a1 estimating and updating the filtered UE buffer result according to the buffer state;
a2 estimating the UE uplink buffer occupancy according to the filtered UE buffer result and other input data except the buffer status.
4. The method of claim 3, wherein the step a1 includes:
estimating a filtered UE buffer result according to the buffer status and based on the following formula:
Fn＝(1-α)*Fn-1+α*Mn
wherein, FnRepresenting the UE buffer result after the filtering at the base station side, Fn-1Representing the UE buffer results before base station side filtering, MnThe buffer status reported recently by the UE is represented, and α represents the filter coefficient.
5. The method according to claim 3 or 4, wherein said step a2 comprises:
estimating uplink buffer occupancy of the UE according to the filtered UE buffer result and other input data except the buffer status based on the following formula:
ULBOSize(n+1)＝ULBOSize(n)-ScheduledSize(n)+Fn
wherein ULBOSize (n +1) represents an estimate of uplink buffer occupancy for the UE after base station side filtering, ULBOSize (n) represents an estimate of uplink buffer occupancy for the UE based on the other input data before base station side filtering, FnIndicating the filtered UE buffering result, and scheduledsize (n) indicating the scheduled or granted buffer occupancy size.
6. The method of claim 1, wherein the method further comprises:
when the UE is determined to be inactive, requesting an MME to trigger a context release process of the UE so as to release resources occupied by the UE.
7. An apparatus for monitoring inactive UEs in a base station of an LTE system, wherein the apparatus comprises:
a first estimating device, configured to estimate uplink buffer occupancy of the UE according to the obtained input data corresponding to the UE, where the uplink buffer occupancy represents an estimation of a size of uplink buffer data of the UE by a base station side;
starting means for starting an inactivity timer when the uplink buffer occupancy and the uplink throughput, the downlink throughput, and the downlink buffer occupancy of the UE are all zero;
means for determining that the UE is an inactive UE when the inactivity timer expires;
wherein, the device still includes:
and the judging device is used for stopping the inactivity timer and determining the UE as the active UE when the uplink buffer occupation, the uplink throughput, the downlink buffer occupation and the downlink throughput are not all zero.
8. The apparatus of claim 7, wherein the input data comprises input from at least one of:
call processing;
an uplink MAC control plane and a user plane;
an RLC user plane;
a RACH decoder;
a PUCCH decoder;
and a PUSCH decoder.
9. The apparatus of claim 8, wherein the input data comprises a buffer status recently reported by the UE, and the first estimating means comprises:
a second estimating device, configured to estimate and update the filtered UE cache result according to the buffer status;
and a third estimating device, configured to estimate, according to the filtered UE buffering result and other input data except the buffer status, an uplink buffer occupancy of the UE.
10. The apparatus of claim 9, wherein the second estimating means is configured to:
estimating a filtered UE buffer result according to the buffer status and based on the following formula:
Fn＝(1-α)*Fn-1+α*Mn
wherein, FnRepresenting the UE buffer result after the filtering at the base station side, Fn-1Buffer occupancy result, M, representing UE cache result before base station side filteringnThe buffer status reported recently by the UE is represented, and α represents the filter coefficient.
11. The apparatus of claim 9 or 10, wherein the third estimating means is for:
estimating uplink buffer occupancy of the UE according to the filtered UE buffer result and other input data except the buffer status based on the following formula:
ULBOSize(n+1)＝ULBOSize(n)-ScheduledSize(n)+Fn
wherein ULBOSize (n +1) represents an estimate of uplink buffer occupancy for the UE after base station side filtering, ULBOSize (n) represents an estimate of uplink buffer occupancy for the UE based on the other input data before base station side filtering, FnIndicating the filtered UE buffering result, and scheduledsize (n) indicating the scheduled or granted buffer occupancy size.
12. The apparatus of claim 7, wherein the apparatus further comprises:
a requesting device, configured to request, when it is determined that the UE is an inactive UE, an MME to trigger a context release procedure of the UE, so as to release resources occupied by the UE.
13. A base station for monitoring inactive UEs in an LTE system, comprising the apparatus of any of claims 7 to 12.
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