CN102378161B - User equipment and method for determining TA (Timing Advance) value by using same - Google Patents
User equipment and method for determining TA (Timing Advance) value by using same Download PDFInfo
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- CN102378161B CN102378161B CN201010264701.8A CN201010264701A CN102378161B CN 102378161 B CN102378161 B CN 102378161B CN 201010264701 A CN201010264701 A CN 201010264701A CN 102378161 B CN102378161 B CN 102378161B
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Abstract
The invention discloses a method for determining a TA (Timing Advance) value by using user equipment, comprising the following steps of: starting a local virtual synchronous time sequence for the idle user equipment; and when the user equipment transforms from an idle state into a connection state, based on the local virtual synchronous time sequence and a captured downlink synchronous time sequence, determining whether updating for the TA value stored in the user equipment is needed or not.
Description
Technical field
The application relates to wireless communication field, is specifically related to the subscriber equipment in mobile communications network and utilizes this subscriber equipment to determine the method for TA value.
Background technology
In mobile communication system, in order to make up the propagation delay time produced due to the distance between base station and mobile device, need to compensate by a time value, this numerical value is called TA (Timing Advance, Timing Advance) value.TA value notifies the mobile device of such as UE (UserEquipment, subscriber equipment) by base station, and is preserved by UE.
In LTE system, when the UE under idle condition RRC-Idle transfers connection status RRC-Connected to, again obtain current TA value by RA (Random Access, Stochastic accessing) process.Under connection status RRC-Connected, base station is constantly updated TA value, to keep TA value effective.
In M2M (Machine to Machine, machine to machine) network, the feature of monitoring class business is that data volume is less, but frequency can be higher; For meeting this type of business demand, terminal needs often to initiate RA process to obtain TA value.When in M2M network, this type of terminal number is more, the Stochastic accessing quantity of M2M network will be very large, thus it is congested to cause producing RA in network, and then affect the communication quality of M2M business.
For this reason, expect to propose a solution, can reduce in M2M network obtained by TA and the RA that causes initiates frequency, thus avoid the RA in network congested.
Summary of the invention
In order to the RA reduced in network initiates frequency, the application provides a kind of method being determined TA value by subscriber equipment on the one hand, comprising: for the subscriber equipment of idle condition starts local virtual synchronous sequence; And described subscriber equipment is when transferring connection status to by idle condition, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, determine whether to need to upgrade the TA value of preserving in described subscriber equipment.
On the other hand, this application provides a kind of subscriber equipment, comprising: clock module, for the subscriber equipment of idle condition starts local virtual synchronous sequence; Determination module, at described subscriber equipment when transferring connection status to by idle condition, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, determines whether to need to upgrade the TA value of preserving in described subscriber equipment; And update module, the determination result according to described determination module upgrades the TA value of preserving.
According to the technical scheme of the application, UE preserves TA value, and utilize the local virtual synchronous sequence safeguarded on UE to determine whether to need the TA value to preserving to upgrade, thus without the need to initiating RA process continually, the RA avoided in network is congested.
Accompanying drawing explanation
Fig. 1 shows the flow chart of the communication means of the UE according to the application's illustrative embodiments;
Fig. 2 shows the illustrative diagram of the down-going synchronous sequential of catching according to local virtual synchronizing sequence and the UE of the application;
Fig. 3 shows another illustrative diagram of the down-going synchronous sequential of catching according to local virtual synchronizing sequence and the UE of the application; And
Fig. 4 shows the structured flowchart of the UE according to the application's illustrative embodiments.
Embodiment
In conjunction with illustrative embodiments, the application is described with reference to the accompanying drawings.
Fig. 1 shows the flow chart of the method 100 according to the application's illustrative embodiments.
As described above, UE obtains TA value from base station in connected state, and preserves the TA value obtained.Execution mode according to Fig. 1, when UE transfers idle condition RRC-Idle to by connection status RRC-Connected, starts local virtual synchronous sequence in step S101, UE.Particularly, when UE catches first down-going synchronous after transferring idle condition to by connection status, start local virtual synchronous sequence.First time point of this sequential aligns with the down-going synchronous sequential of catching.The radio frames of the descending synchronous signal channel in the clock cycle of this sequential and wireless communication system is consistent.See the embodiment that Fig. 2 illustrates, the moment t0 in the sequential chart of below is first down-going synchronous that UE catches after transferring idle condition to, and the sequential chart of top is the local virtual synchronous sequence that the down-going synchronous of catching according to the t0 moment starts.As shown in the figure, first time point (that is, moment 0) of local virtual synchronous sequence aligns with the moment t0 in down-going synchronous sequential.Local virtual synchronous sequence keeps synchronous by descending synchronous signal channel and radio frames, that is, the period of time T of local virtual synchronous sequence equals the up-downgoing switching point cycle in wireless communication system.Such as, for the situation in TDD 5ms up-downgoing switching point cycle, this period of time T is 5ms.
After this, in step S102, when UE needs to transfer connection status to by idle condition, based on local virtual synchronous sequence and current down-going synchronous sequential of catching, determine whether to need the TA value to preserving to upgrade.If so, then upgrade TA value in step S103 and communicate based on the TA value upgraded; Otherwise, communicate based on the TA value of previously preserving in step S104.
Such as, in step S102, based on local virtual synchronous sequence and the down-going synchronous of catching sequential, current TA can be obtained and upgrades estimated value (that is, the bias between current time and the corresponding time point in local virtual sequential); And this TA renewal estimated value and predetermined value are compared.When TA renewal estimated value reaches predetermined value, determine and need the TA value to preserving to upgrade; Otherwise, upgrade without the need to carrying out TA value.
To catch first down-going synchronous under idle condition see Fig. 2, UE in the t0 moment, and start local virtual synchronous sequence, after this, catch down-going synchronous successively in the moment such as t1, t2 ..., T (n).Such as, if need to transfer connection status at t1 moment UE, then t1 and t0+T is compared, to determine whether difference therebetween reaches predetermined threshold value.In the situation shown in fig. 2, due to t1=t0+T, therefore, if now need to transfer connection status to, then the TA of preservation directly can be used to communicate, and upgrade without the need to carrying out TA value.
Continue see Fig. 2, moment t1 and t2 catching second and third down-going synchronous aligns with moment T and 2T in local virtual synchronous sequence respectively, that is, t1=t0+T, t2=t0+2T; And catch the moment t3=t0+3T+ Δ t ' (Δ t ' > 0) of the 4th down-going synchronous.In this case, if need to transfer connection status in the t3 moment, according to the moment t3 now catching down-going synchronous, catch the difference between the moment of down-going synchronous and the corresponding moment in virtual synchronous with Δ t '.That is, compared with the t2 moment, UE is at the position v Δ t ' far away of t3 moment distance base station, and wherein, v is wave transmissions speed, and now, it is 2 Δ t ' that TA upgrades estimated value.When Δ t ' or 2 Δ t ' reaches predetermined value, determine to need to upgrade TA value.Here predetermined value can be system default value, also can for the value configured by base station.If Δ t ' does not reach predetermined value, then determine directly to use the TA of preservation to communicate, and upgrade without the need to carrying out TA value.
Equally, if until t (n+1)=t0+ (n+1) T+ Δ t '-Δ t after the t0 moment " (Δ t " > 0) moment just needs to transfer connection status to by idle condition, then and the TA that can judge now upgrades estimated value (Δ t '-Δ t ") or whether 2 (Δ t '-Δ t ") (or its absolute value) reaches predetermined value.If so, then determine to need to upgrade TA value; Otherwise, determine not need to upgrade TA value.
The renewal of step S103, can initiate RA process by UE and again realize from base station acquisition TA value, the TA value that UE also can be utilized to safeguard directly carries out upgrading and realizing.Specifically describe the TA value using UE to safeguard below and directly carry out more news.
As described above, as t (n)=t0+nT+ Δ t, the time difference of catching between the moment of down-going synchronous and the corresponding moment in virtual synchronous is Δ t.The TA set due to UE is with descending synchronous signal channel as benchmark, and therefore, TA now upgrades estimated value and can be 2 Δ t, can be TAs+2 Δ t by the TA updated value that this TA renewal estimated value obtains.In this case, the TA value TAs previously preserved can be updated to TA updated value TAs '=TAs+2 Δ t.
Such as, as shown in Figure 2, if UE needs to transfer connection status to when t3=t0+3T+ Δ t ', and 2 Δ t ' or Δ t ' reach predetermined value, then TA value is updated to TAs+2 Δ t ' by previous TAs.If UE is at t (n+1)=t0+ (n+1) T+ Δ t '-Δ t " time needs to transfer connection status to; and TA upgrades estimated value 2 (Δ t '-Δ t ") or Δ t '-Δ t " (or its absolute value) be greater than predetermined value; then can determine that TA updated value is TA=TAs+2 (Δ t '-Δ t "), and by this updated value, TA value be upgraded.
In one embodiment, UE can stop data receiver to save power consumption in some radio frames.In this case, UE still needs to keep the maintenance to local virtual synchronous sequence, thus when UE receives data again, by the down-going synchronous of catching time and local virtual are made comparisons lock in time, still can judge whether to need to upgrade TA value, and perform TA renewal rewards theory when needed.Fig. 3 shows an embodiment of this situation.As shown in the figure, UE stops data receiver after instant t 2, until again receive data in the t5 moment.Now, obtain t5=t0+5T+ Δ t ', and whether reach predetermined value to determine whether according to 2 Δ t ' or Δ t ' and need to upgrade TA value.Thus UE again transfers connection status to based on the TA value upgraded or the TA value of preservation and communicates.After again transferring idle condition to by connection status, again perform each step mentioned above, start new local virtual sequential, so that the local virtual sequential safeguarded according to UE when next time needs to transfer connection status to obtains suitable TA value.
According to the another aspect of the application, provide the subscriber equipment in a kind of mobile communications network.As shown in Figure 4, UE 40 comprises clock module 41, determination module 42 and update module 43.Clock module 41 is configured at described subscriber equipment when transferring idle condition to by connection status, starts local virtual synchronous sequence.Determination module 42 is configured at described subscriber equipment when transferring connection status to by idle condition, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, determines whether to need to upgrade the TA value of preserving in described subscriber equipment.Update module 43 is configured to upgrade the TA value of preserving according to the determination result of described determination module.Determination and the renewal of determination module 42 and update module 43 are described in detail above.
In one embodiment, determination module comprises estimation unit and comparing unit.Estimation unit is configured to, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, obtain current TA and upgrade estimated value.Comparing unit is configured to described TA renewal estimated value and predetermined value to compare.When TA renewal estimated value reaches predetermined value, determination module is determined needs the TA value to preserving to upgrade.
Above the illustrative embodiments of the application is described, those skilled in the art should understand, the application is not limited to above-mentioned embodiment, under the prerequisite of spirit and scope not departing from the application, can carry out suitable amendment and distortion to above-mentioned execution mode.The protection range of the application is defined by the following claims.
Claims (8)
1. determined the method for TA value by subscriber equipment, comprising:
For the subscriber equipment of idle condition starts local virtual synchronous sequence; And
Described subscriber equipment, when transferring connection status to by idle condition, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, determines whether to need to upgrade the TA value of preserving in described subscriber equipment,
Wherein, perform the step of described startup local virtual synchronous sequence when described subscriber equipment transfers idle condition to by connection status, comprising:
Start local virtual synchronous sequence, first timing node of the down-going synchronous sequential that first timing node of described local virtual synchronous sequence is caught after transferring idle condition to described subscriber equipment aligns;
Wherein, determine whether described in need the step to the TA value of preserving upgrades to comprise:
Based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, obtain current TA and upgrade estimated value; And
Determine that described TA upgrades estimated value and whether reaches predetermined value,
Wherein, when described TA renewal estimated value reaches described predetermined value, determine and need the TA value to preserving to upgrade.
2. the method for claim 1, wherein described renewal comprises:
By to base station initiating random access procedure, obtain TA updated value.
3. the method for claim 1, wherein described renewal comprises:
Based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, obtain current TA and upgrade estimated value, and by described TA renewal estimated value, the TA value of preserving is upgraded.
4. the method for claim 1, wherein described local virtual synchronous sequence keeps continuous and effective upon actuation, until described subscriber equipment transfers connection status to by idle condition.
5. a subscriber equipment, comprising:
Clock module, for the subscriber equipment of idle condition starts local virtual synchronous sequence; Determination module, at described subscriber equipment when transferring connection status to by idle condition, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, determines whether to need to upgrade the TA value of preserving in described subscriber equipment;
Wherein, when described subscriber equipment transfers idle condition to by connection status, described clock module starts local virtual synchronous sequence, and first timing node of the down-going synchronous sequential that first timing node of described local virtual synchronous sequence is caught after transferring idle condition to described subscriber equipment aligns;
Wherein, described determination module comprises:
Estimation unit, based on described local virtual synchronous sequence and the down-going synchronous sequential of catching, obtains current TA and upgrades estimated value; And
Comparing unit, upgrades estimated value by described TA and predetermined value compares;
Wherein, when described TA renewal estimated value reaches described predetermined value, determine and need the TA value to preserving to upgrade;
And
Update module, the determination result according to described determination module upgrades the TA value of preserving.
6. subscriber equipment as claimed in claim 5, wherein, described update module, by base station initiating random access procedure, obtains TA updated value.
7. subscriber equipment as claimed in claim 5, wherein, described update module, based on described down-going synchronous sequential and described local virtual synchronous sequence, obtains current TA and upgrades estimated value and upgrade the TA value of preserving by described TA renewal estimated value.
8. subscriber equipment as claimed in claim 5, wherein, described clock module is configured to make described local virtual synchronous sequence keep continuous and effective upon actuation, until described subscriber equipment will carry out TA renewal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010264701.8A CN102378161B (en) | 2010-08-27 | 2010-08-27 | User equipment and method for determining TA (Timing Advance) value by using same |
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| CN201010264701.8A CN102378161B (en) | 2010-08-27 | 2010-08-27 | User equipment and method for determining TA (Timing Advance) value by using same |
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| CN102378161B true CN102378161B (en) | 2015-07-01 |
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| CN108337728B (en) * | 2017-01-19 | 2022-03-18 | 中兴通讯股份有限公司 | Timing advance maintenance method, device and system |
| CN111867063B (en) * | 2019-04-29 | 2023-01-13 | 华为技术有限公司 | Uplink transmission method and communication device |
| CN114830799A (en) * | 2020-02-28 | 2022-07-29 | Oppo广东移动通信有限公司 | Time synchronization method, terminal equipment and network equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101154984A (en) * | 2006-09-25 | 2008-04-02 | 大唐移动通信设备有限公司 | Method and system for remaining ascending synchronization |
| CN101162957A (en) * | 2006-10-12 | 2008-04-16 | 中兴通讯股份有限公司 | Synchronous control method and system for time division multiplex communication system |
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| US20040081131A1 (en) * | 2002-10-25 | 2004-04-29 | Walton Jay Rod | OFDM communication system with multiple OFDM symbol sizes |
| CN101272176B (en) * | 2007-03-21 | 2011-09-14 | 电信科学技术研究院 | Initial synchronization method and device of upstream channel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101154984A (en) * | 2006-09-25 | 2008-04-02 | 大唐移动通信设备有限公司 | Method and system for remaining ascending synchronization |
| CN101162957A (en) * | 2006-10-12 | 2008-04-16 | 中兴通讯股份有限公司 | Synchronous control method and system for time division multiplex communication system |
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Granted publication date: 20150701 |