CN102256321A - Method and system for controlling terminal cell handover under discontinuous reception (DRX) - Google Patents
Method and system for controlling terminal cell handover under discontinuous reception (DRX) Download PDFInfo
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- CN102256321A CN102256321A CN2011101967738A CN201110196773A CN102256321A CN 102256321 A CN102256321 A CN 102256321A CN 2011101967738 A CN2011101967738 A CN 2011101967738A CN 201110196773 A CN201110196773 A CN 201110196773A CN 102256321 A CN102256321 A CN 102256321A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method and a system for controlling terminal cell handover under discontinuous reception (DRX). The influence of DRX operation on terminal handover mobility is obviously reduced, the cell handover time is shortened, and the handover efficiency is improved. The method for controlling the terminal cell handover under DRX comprises the following steps that: when a terminal transmits a cell handover measurement report to an evolved NodeB (eNB), the terminal transmits indication information to a media access control (MAC) layer of the terminal, wherein the indication information indicates that the terminal is positioned in an activated state under DRX of the time from the current time to the next On Duration; the MAC layer of the terminal modifies state setting of the terminal according to the indication information; and the eNB acquires the state setting modified by the terminal, determines to execute cell handover and immediately transmits a handover command to the terminal in the activated state.
Description
Technical field
The present invention relates to wireless communication technology field, especially relate to a kind of method and system that switch the terminal sub-district under the discontinuous reception of controlling.
Background technology
At Long Term Evolution (Long Term Evolution, LTE) in the system, in order to reduce subscriber equipment (the User Equipment under the connection status, UE) power consumption, the allocation radio resource control protocol (Radio Resource Control, RRC) UE under the connection status supports discontinuous reception (Di scontinuous Reception, DRX) operation, promptly allow UE in a period of time, to be in sleep state (Sleep period), and be in activation (Active) state in the period at another section.
Under DRX, UE when lasting timer (On Duration Timer) moves the duration (On Duration) or the static timer of DRX (run duration of DRX Inactivity Timer is in state of activation, can monitor Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH); And be in sleep state following time as UE, stop to monitor PDCCH.
In the prior LTE system, when not adopting DRX, UE carries out the process that switch the sub-district, referring to Fig. 1, comprises the steps:
1) UE measures (Measurement) to each candidate cell;
2) UE is sent to the base station of evolution with measurement report (Measurement report) (evolved NodeB eNB), is carried out handover decisions and switch to be prepared (Handover decision and preparation) by eNB;
3) after the sub-district switching was carried out in decision, eNB sent switching command (Handover command) to UE.UE carries out handoff procedure (Handover process, HO process) according to this switching command.
Yet, when the DRX of configuration connection mode, the switching mobility of selected DRX parameter possibility negative effect UE.For example, if UE sends to eNB with measurement report, but UE entered sleep state before receiving switching command, and at this moment, UE can not receive the switching command that eNB sends.Then eNB need wait for that UE could be sent to UE with switching command when entering next state of activation.This processing mode has been introduced extra time delay in the cell switch process of UE, particularly for the UE that has disposed long DRX cycle, long time delay can appear, cause the sub-district long switching time, switching efficiency is lower, even can cause UE experience Radio Link Failure or handoff failure.
Summary of the invention
The embodiment of the invention provides a kind of method and system that switch the terminal sub-district under the discontinuous reception of controlling, and has significantly reduced the DRX operation terminal is switched ambulant influence, shortens the time that switch the sub-district, improves switching efficiency.
For achieving the above object, the technical scheme of the embodiment of the invention is achieved in that
The embodiment of the invention provides a kind of method that switch the terminal sub-district under the discontinuous reception of controlling, and comprising:
When the base station eNB of evolution sent the measurement report of triggering cell switching, terminal sent indication information to the MAC layer of self in terminal, and described indication information indicating terminal time between the On Duration from current to next is in the state of activation under the DRX;
The MAC layer of terminal is revised the state setting of terminal according to described indication information;
ENB is known the state setting after the described terminal modifications, after switch definite execution sub-district, immediately switching command is sent to the terminal that is in state of activation.
The embodiment of the invention also provides a kind of system that switch the terminal sub-district under the discontinuous reception that controls, and described system comprises terminal and eNB,
Described terminal, be used for when sending the measurement report of triggering cell switching to eNB, MAC layer to self sends indication information, the MAC layer of terminal is according to the state setting of described indication information modification terminal, and described indication information indicating terminal time between the On Duration from current to next is in the state of activation under the DRX;
Described eNB is used to know the state setting after the described terminal modifications, determines to carry out after the sub-district switches, and immediately switching command is sent to the terminal that is in state of activation.
By as seen above-mentioned, the technical scheme of the embodiment of the invention is by resetting the MAC layer, the state of activation and the sleep state of sub-district terminal when switching carried out in control, prolonged the time that terminal can be monitored switching command, reduced the risk that switching command is delayed transmission.
The technical program can be when utilizing the DRX operation to reduce the terminal power consumption, significantly reduced the DRX operation terminal has been switched ambulant influence, avoid shortening the time that switch the sub-district, improve switching efficiency because the DRX operation causes terminal wireless link failure or handoff failure.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of cell switching method when not adopting DRX in the prior art;
A kind of method flow schematic diagram of controlling terminal sub-district switching under the discontinuous reception that Fig. 2 provides for the embodiment of the invention one;
The DRX method of operation schematic diagram that Fig. 3 provides for the embodiment of the invention two;
A kind of method flow schematic diagram of controlling terminal sub-district switching under the discontinuous reception that Fig. 4 provides for the embodiment of the invention two;
Fig. 5 is for carrying out the schematic diagram that occurs time delay when switch the sub-district under the DRX operation in the existing scheme;
A kind of system configuration schematic diagram of controlling terminal sub-district switching under the discontinuous reception that Fig. 6 provides for the embodiment of the invention three.
Embodiment
Below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope of protection of the invention.
The embodiment of the invention one provides a kind of method that switch the terminal sub-district under the discontinuous reception of controlling, and referring to Fig. 2, described method comprises:
1: (evolved NodeB eNB) sends the measurement report that triggering cell is switched to terminal (as UE) to the base station of evolution.
2: terminal sends indication information to medium access control (MAC) layer of self, described indication information indicating terminal from current to the next one duration time (On Duration) be in state of activation under the discontinuous reception (DRX).
Above-mentioned On Duration for continue timer (On Duration Timer) operation during.The moment of (when perhaps the MAC layer receives indication information) when above-mentioned " current " refers to terminal transmission indication information.On Duration in the next DRX operation that above-mentioned " next On Duration " refers to carry out behind the current DRX EO of terminal.
3: the MAC layer of terminal is revised the state setting of terminal according to described indication information.
4:eNB is known the state setting after the described terminal modifications.
5:eNB determines to carry out the sub-district and switches.
ENB determines needs execution sub-district switching according to the measurement report that receives, and generates switching command.
6:eNB sends to switching command the terminal that is in state of activation after determining to carry out the sub-district switching immediately.
Modification by in the step 3 the UE state being provided with has guaranteed that the state when terminal receives switching command in step 6 is a state of activation.
By as seen above-mentioned, the technical scheme of the embodiment of the invention is by resetting the MAC layer, the state of activation and the sleep state of sub-district terminal when switching carried out in control, prolonged the time that terminal can be monitored switching command, reduced the risk that switching command is delayed transmission.
The technical program can be when utilizing the DRX operation to reduce the terminal power consumption, significantly reduced the DRX operation terminal has been switched ambulant influence, avoid shortening the time that switch the sub-district, improve switching efficiency because the DRX operation causes terminal wireless link failure or handoff failure.
The method that switch the terminal sub-district under the discontinuous reception of control that the embodiment of the invention two is provided is described below.
In order to clearly demonstrate the scheme of the embodiment of the invention, (Discontinuous Reception, DRX) related content in the operation is described to discontinuous reception below in conjunction with Fig. 3.
DRX cycle (DRX Cycle): the repetition period of regulation quiescent period (inactivity) On Duration afterwards, referring to Fig. 3.
The static timer of DRX (DRX Inactivity Timer): be defined in successfully decoding indication to the initial uplink of current UE or Physical Downlink Control Channel (the Physical Downlink Control Channel of down user data transmission, PDCCH) afterwards, continuous PDCCH number of sub-frames.
Continue timer (On Duration Timer): continuous PDCCH number of sub-frames when the regulation DRX cycle begins.UE is under the On Duration during On Duration Timer operation, as shown in mark O among Fig. 3.
Activationary time (Active Time): shown in mark A among Fig. 3, the time relevant with DRX operation, during UE in the PDCCH subframe, monitor PDCCH.In activationary time, UE is in state of activation.
The length of one's sleep (Sleep Period): shown in mark S among Fig. 3, during UE can not in the PDCCH subframe, monitor PDCCH.
Above-mentioned PDCCH subframe to FDD UE operation, is represented all subframes; To TDD UE operation, only represent descending sub frame and the subframe that comprises DwPTS.
Concrete, activationary time can comprise the following time period:
The time period that On duration Timer or DRX Inactivity Timer are moving; Perhaps, UE has sent the time period that SR (dispatch request) and SR are waiting on PUCCH.
Wherein, the purpose that DRX inactivity timer is set be can be on the basis of initial activation phase the proper extension activationary time, increase the dispatcher meeting of UE, and UE whenever receives the control signaling of once dispatching new data transmission, this timer is restarted in the capital, to avoid owing to the too early overtime dispatcher that causes of timer can reduce.DRX inactivity timer and on duration timer may move simultaneously.
Referring to Fig. 3, the starting point (Starting Point) of a DRX cycle of mark D 1 expression, in D 1 back On duration Timer operation, and when On duration Timer moves and after overtime, restarted DRX inactivity timer for three times, shown in mark I 1, the run duration of the DRX inactivity timer of restarting for the third time is expressed as I2, at this DRXinactivity timer of I3 point overtime (Expires), UE enters the length of one's sleep after the I3 point.
Referring to Fig. 4, the method that switch the terminal sub-district under the discontinuous reception of the control that the embodiment of the invention two provides specifically comprises:
1) UE measures (Measurement) to each candidate cell;
2) UE to eNB send dispatch request (Scheduling Request, SR).According to the setting of activationary time, at this moment UE thinks that self is in state of activation, begins to monitor PDCCH.
3) eNB sends PDCCH information to UE.
UE receives the PDCCH information of carrying uplink authorization (UL Grant) of addressing self.At this moment, the DRX inactivity timer under the DRX behavior is restarted, and has prolonged the activationary time of UE.
4) UE is sent to the base station of evolution with measurement report (Measurement report) (evolved NodeB eNB), is carried out handover decisions and switch to be prepared (Handover decision and preparation) by eNB.
Above-mentioned measurement report carries out the measurement report that switch the sub-district for triggering UE, in terminal when eNB sends the measurement report that triggering cell switches, terminal sends indication information to the MAC layer of self, and described indication information indicating terminal continues the state of activation under the discontinuous reception DRX of being in the On Duration from current to the next one.
The moment of (when perhaps the MAC layer receives indication information) when above-mentioned " current " refers to terminal transmission indication information.The concrete moment of this " current " is not carried out strict control, only need satisfy after eNB determines to switch promptly when UE issues switching command, UE is in state of activation.On Duration in the next DRX operation that above-mentioned " next On Duration " refers to carry out behind the current DRX EO of terminal.
Because the triggering of measurement report is by Radio Resource control (Radio Resource Control, RRC) determine, the MAC layer can't know whether the upper strata has sent measurement report, so, terminal sends above-mentioned indication information by rrc layer to the MAC layer of self when sending measurement report, by state of activation and the dormant switching of MAC layer according to this indication information control UE.
The MAC layer of terminal is revised the state setting of terminal according to described indication information, it is also different to revise the concrete grammar that is provided with according to the different MAC layers of UE current state, for example, the MAC layer of terminal can will be a state of activation from receiving described indication information to the status modifier of terminal between the next On Duration; Perhaps, if the static timer of DRX of terminal moves, then the MAC layer of terminal is state of activation according to described indication information with the overtime back status modifier to terminal between the next On Duration of Inactivity Timer.Be provided with by revising, prolong the time of UE, accelerated switching efficiency the PDCCH monitoring.
Further, may not can trigger the measurement report of switching for period measurement report or some in this programme, UE and eNB can not prolong activationary time (promptly not to state setting make amendment), rrc layer as UE does not send indication to the MAC layer through after judging, the eNB side also is consistent with UE to the understanding of activationary time, so that save the UE electric weight.
3) after the sub-district switching was carried out in decision, eNB sent switching command (Handover command) to UE.UE carries out handoff procedure (Handover process, HO process) according to this switching command.
ENB and UE need be consistent to the understanding of activationary time, and eNB need be known the state setting after the described terminal modifications, after eNB determines to carry out the sub-district switching, can immediately switching command be sent to the terminal that is in state of activation like this.
After eNB receives described measurement report, the rrc layer of eNB sends indication information to the MAC layer of self, described indication information indication relevant terminal is in state of activation under the DRX between the OnDuration from current to next, thereby eNB is consistent to the understanding and the UE of activationary time.
For the beneficial effect that makes this programme more obvious, Fig. 5 and Fig. 4 are compared, Fig. 5 has shown the schematic diagram that occurs time delay when carrying out the sub-district switching in the existing scheme under the DRX operation, can know from Fig. 5 and Fig. 4 contrast and to find out, in the existing configuration, the time of the operation of DRX inactivity timer may fall short of clear-headed to guarantee UE maintenance always before receiving switching command, thereby has produced time delay for switching.Particularly, may occur than long delay to only having disposed the UE of long DRX cycle.This may cause UE experience Radio Link Failure or handoff failure, especially to heterogeneous network (Heterogeneous Network, HetNet) in precipitous channel variation scene, this problem is more obvious.
And this programme can significantly reduce DRX operation terminal is switched ambulant influence, avoids because the DRX operation causes terminal wireless link failure or handoff failure, shortens the time that switch the sub-district, improves switching efficiency.
Further, this programme also comprises: when eNB determines not carry out the sub-district switching, perhaps, eNB determine to carry out that the sub-district is switched but terminal when not receiving the switching command that eNB sends yet when next On Duration finishes, terminal enters sleep state according to the regulation of DRX after described next On Duration finishes.
For example, eNB is through after the switch decision, think current do not need to switch (all transship such as all adjacent sub-districts, may choose in this case and allow the UE call drop that is in low priority), perhaps, the switch decision of eNB and the overlong time of preparation, thereby cause UE during next on duration, still not receive the PDCCH (this PDCCH is used to send switching command) of addressing self, at this moment, to the regulation of UE, make UE enter the length of one's sleep according to existing DRX.
With respect to existing LTE scheme, this programme can prolong the time that UE monitors switching command, reduces the risk that switching command message is delayed transmission; This programme is simple to the modification of MAC layer, is easy to realize; This programme can guarantee that the UE behavior is still consistent with existing DRX notion, and the UE that has been modified the state setting still is in the DRX operation down always, does not need to increase UE and stops/starting the operation of DRX automatically, thereby influence less to the UE power consumption.
The embodiment of the invention three provides a kind of system that switch the terminal sub-district under the discontinuous reception that controls, and referring to Fig. 6, described system comprises terminal 61 (as UE) and eNB 62,
Described terminal 61, be used for when eNB 62 sends the measurement report of triggering cell switching, MAC layer to self sends indication information, the MAC layer of terminal is according to the state setting of described indication information modification terminal, and described indication information indicating terminal time between the On Duration from current to next is in the state of activation under the DRX;
Described eNB 62 is used to know described terminal 61 amended state settings, after switch definite execution sub-district, immediately switching command is sent to the terminal 61 that is in state of activation.
Further, described terminal 61 also comprises state set unit, and the MAC layer that is used for control terminal will be a state of activation from receiving described indication information to the status modifier of terminal between the next On Duration; Perhaps, if the DRX Inactivity Timer of terminal moves, described state set unit, the MAC layer that is used for control terminal is state of activation according to described indication information with the overtime back status modifier to terminal between the next On Duration of DRX Inactivity Timer.
Further, described eNB comprises that state knows the unit, be used for after eNB receives described measurement report, the rrc layer of control eNB sends indication information to the MAC layer of self, and described indication information indication relevant terminal time between the On Duration from current to next is in the state of activation under the DRX.
The concrete working method of terminal and eNB can be referring to method embodiment of the present invention in the system embodiment of the present invention.
By as seen above-mentioned, the technical scheme of the embodiment of the invention is by resetting the MAC layer, the state of activation and the sleep state of sub-district terminal when switching carried out in control, prolonged the time that terminal can be monitored switching command, reduced the risk that switching command is delayed transmission.
The technical program can be when utilizing the DRX operation to reduce the terminal power consumption, significantly reduced the DRX operation terminal has been switched ambulant influence, avoid shortening the time that switch the sub-district, improve switching efficiency because the DRX operation causes terminal wireless link failure or handoff failure.
Those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can software product form embody, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. control the method that switch the terminal sub-district under the discontinuous reception for one kind, it is characterized in that described method comprises:
In terminal when the base station eNB of evolution sends the measurement report that triggering cell switches, terminal sends indication information to the media access control MAC layer of self, described indication information indicating terminal from current to the next one duration time the On Duration be in state of activation under the discontinuous reception DRX;
The MAC layer of terminal is revised the state setting of terminal according to described indication information;
ENB is known the state setting after the described terminal modifications, after switch definite execution sub-district, immediately switching command is sent to the terminal that is in state of activation.
2. method according to claim 1 is characterized in that, described terminal specifically comprises to the media access control MAC layer transmission indication information of self:
Terminal sends indication information by the radio resource control rrc layer to the MAC layer of self.
3. method according to claim 2 is characterized in that, described eNB knows that the state setting after the described terminal modifications comprises:
After eNB received described measurement report, the rrc layer of eNB sent indication information to the MAC layer of self, and described indication information indication relevant terminal time between the OnDuration from current to next is in the state of activation under the DRX.
4. method according to claim 1 is characterized in that, described method also comprises:
When eNB determines not carry out the sub-district switching, perhaps, eNB determine to carry out that the sub-district is switched but terminal when not receiving the switching command that eNB sends yet when described next On Duration finishes, and terminal enters sleep state according to the regulation of DRX after described next On Duration finishes.
5. method according to claim 1 is characterized in that, the state that the MAC layer of described terminal is revised terminal according to described indication information is provided with specifically and comprises:
The MAC layer of terminal will be a state of activation from receiving described indication information to the status modifier of terminal between the next OnDuration; Perhaps,
The static timer Inactivity of the DRX of terminal Timer moves, and the MAC layer of terminal is state of activation according to described indication information with the overtime back status modifier to terminal between the next On Duration of DRX Inactivity Timer.
6. control the system that switch the terminal sub-district under the discontinuous reception for one kind, it is characterized in that described system comprises the base station eNB of terminal and evolution,
Described terminal, be used for when sending the measurement report of triggering cell switching to eNB, media access control MAC layer to self sends indication information, the MAC layer of terminal is revised the state setting of terminal according to described indication information, described indication information indicating terminal from current to the next one duration time the On Duration be in state of activation under the discontinuous reception DRX;
Described eNB is used to know the state setting after the described terminal modifications, determines to carry out after the sub-district switches, and immediately switching command is sent to the terminal that is in state of activation.
7. system according to claim 6 is characterized in that described terminal comprises state set unit,
Described state set unit, the MAC layer that is used for control terminal will be a state of activation from receiving described indication information to the status modifier of terminal between the next On Duration;
Perhaps,
If the static timer Inactivity of the DRX Timer of terminal moves, described state set unit, the MAC layer that is used for control terminal is state of activation according to described indication information with the overtime back status modifier to terminal between the next On Duration of DRX Inactivity Timer.
8. system according to claim 7, it is characterized in that, described eNB comprises that state knows the unit, be used for after eNB receives described measurement report, the rrc layer of control eNB sends indication information to the MAC layer of self, and described indication information indication relevant terminal time between the On Duration from current to next is in the state of activation under the DRX.
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