CN102045834A - Method and device for allocating TA list - Google Patents
Method and device for allocating TA list Download PDFInfo
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- CN102045834A CN102045834A CN2009102354461A CN200910235446A CN102045834A CN 102045834 A CN102045834 A CN 102045834A CN 2009102354461 A CN2009102354461 A CN 2009102354461A CN 200910235446 A CN200910235446 A CN 200910235446A CN 102045834 A CN102045834 A CN 102045834A
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Abstract
The invention discloses a method and a device for allocating a tracking area (TA) list, which are used for more reasonably allocating the TA list for user equipment (UE). The method for allocating the TA list comprises the following steps that: when meeting the preset trigger condition, a mobility management entity (MME) determines the movement speed and movement direction of the UE by initiating the positioning process of the UE; and the MME allocates the TA list for the UE according to the movement speed and movement direction of the UE.
Description
Technical field
The present invention relates to communication technical field, relate in particular to distribution method and the device of a kind of tracking area identification list (TA List, Tracking Area List).
Background technology
TA List is the notion of introducing in evolved packet system (EPS, the Evolved Packet System) system, when the user is mobile in the TA List that is distributed, can not upgrade because of the trigger position district, border of crossing over tracking area (TA, Tracking Area).The user of different translational speeds is distributed the TA List of different sizes, frequency that can active balance tracing section updating (TAU, Tracking Area Update) and the relation between the paging amount.The main reference condition of distribution T A List is the speed and the direction of subscriber equipment (UE).
In the EPS system, by MME is UE distribution T A List, specifically heavily distribute in (GUTI Relocation, Globally UniqueTemporary Identity Relocation) process and carry out adhering to (Attach), TAU or the whole world unique (user) temporary mark.For the higher UE of movement velocity, MME distributes bigger TA List, and for the lower or static UE of speed, MME distributes less TA List.The size of TAList is directly proportional with the signaling amount of paging (paging), and promptly TAList is big more, and the signaling amount of paging is big more, and the frequency that UE carries out TAU is more little; And TA List is more little, and the signaling amount of paging is just few more, but the frequency of UE generation TAU can be bigger.Therefore, distribute suitable TA List extremely important to the optimization system performance.
Because the distribution of TA List is a kind of implementation method, does not stipulate concrete implementation algorithm in the standard.Operator can be according to external conditions such as deployment scenario, the current TA (or the one or more TA around it) of UE is covered among the TA List of this UE, also can carry out the estimation of the UE movement rate and the direction of motion, thereby distribute a more suitably TAList according to the existing parameter among the MME.Wherein, described existing parameter comprises: TA list, the last tracking area identification (TAI of last TAU) that tracing section updating takes place, evolved universal terrestrial radio access network (E-UTRAN, Evolved Universal Terrestrial RadioAccess Network) cellular global identity (CGI, Cell Global Identity), E-UTRAN sub-district (Cell) sign (Identity) age (Age), and UE report generation TAU the time tracking area identification (TAI, Tracking Area Identity) of place TA and last visit the sign (lastvisited TAI) of tracking area.MME can judge the direction of motion of UE by the TAI at last visited TAI and the current place of UE, estimates the movement rate of UE again based on time interval of twice TAU.
But when being based on UE movement rate and direction of motion distribution T A List, estimate that at present there is certain problem in the method for the UE movement rate and the direction of motion.Because UE is in the free time during (IDLE) state, the TA at place when MME only knows the TAList at this UE place and carries out TAU for the last time, and the CGI (E-UTRAN Cell Global Identity) and the age (E-UTRANCell Identity Age) thereof of the sub-district known for the last time of MME.At first, MME has only from tracing section updating request (TAURequest) message that UE sends and just knows last visited TAI, and compares with actual direction with the UE direction of motion that Last visited TAI and current TAI estimate and to have than mistake.Secondly, because E-UTRANCell ID Age represents elapsed time behind the last recording cell, the time interval that therefore can not twice TAU of accurate description UE.In a word, the direction of motion of existing estimation UE and the algorithm of movement rate can produce very mistake.
If do not consider the movement rate and the direction of motion of UE, then in order to reduce the frequency of TAU, the TA List that MME distributes should be bigger, to cover the possible direction of motion of user.But, this method can not be well according to user's movement characteristic distribution T AList, thereby increased a lot of unnecessary paging amounts.
In sum, existing technology based on UE movement rate and direction of motion distribution T A List because the algorithm of the estimation UE movement rate and the direction of motion exists than mistake, causes the distribution of TA List reasonable inadequately.
Summary of the invention
The embodiment of the invention provides distribution method and the device of a kind of TA List, in order to more reasonably to be UE distribution T AList.
The distribution method of a kind of TA List that the embodiment of the invention provides comprises:
When satisfying preset triggering conditions, Mobility Management Entity MME determines the movement rate and the direction of motion of described UE by initiating the position fixing process to user equipment (UE);
Described MME is described UE distribution T A List according to the movement rate and the direction of motion of described UE.
A kind of MME device that the embodiment of the invention provides comprises:
UE movement velocity determining unit is used for when satisfying preset triggering conditions, by initiating the position fixing process to user equipment (UE), determines the movement rate and the direction of motion of described UE;
TA List allocation units are used for the movement rate and the direction of motion according to described UE, are described UE distribution T AList.
The embodiment of the invention is when satisfying preset triggering conditions, and MME determines the movement rate and the direction of motion of UE by initiating the position fixing process to UE; MME is UE distribution T A List according to the movement rate and the direction of motion of UE, thereby by determining the movement rate and the direction of motion of UE more exactly, has improved the reasonability that TAList distributes.
Description of drawings
The position fixing process schematic diagram that the MME that Fig. 1 provides for the embodiment of the invention initiates;
The movement rate that Fig. 2 provides for the embodiment of the invention and the schematic diagram of the direction of motion;
The schematic flow sheet of the distribution method of a kind of TA List that Fig. 3 provides for the embodiment of the invention;
The location schematic diagram that the MME that Fig. 4 provides for the embodiment of the invention triggers;
UE moves to the schematic diagram of different TA in the scene one that Fig. 5 provides for the embodiment of the invention;
UE moves to the schematic diagram of different TA in the scene two that Fig. 6 provides for the embodiment of the invention;
The structural representation of a kind of MME that Fig. 7 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides distribution method and the device of a kind of TA List, in order to more reasonably to be UE distribution T AList.
The distribution of the embodiment of the invention by using the chain of command location to assist TA List, thereby the distribution reasonability of raising TA List.
The chain of command location technology is a kind of technology that allows positioning client terminal to obtain location information of mobile terminal.In the present standard, positioning client terminal can be the entity of core net inside, such as MME.Positioning client terminal except can the positional information of requesting terminal, movement velocity information such as (comprising the movement rate and the direction of motion) that can also the requesting terminal.Therefore, the chain of command location technology can be easily provides required UE movement rate and direction of motion information to the distribution of TA List.
The position determining entity that the embodiment of the invention relates to mainly comprises: Serving Mobile Location Center of MME, evolution (E-SMLC, Evolved Serving Mobile Location Center) and evolved base station (eNB).As shown in Figure 1, in position fixing process, MME sends the position requests of UE to E-SMLC, UE location resource needed is organized and is distributed by E-SMLC, comprises and selects localization method, Resources allocation and parameter conversion etc.Then, send Location Request to MME, comprising the required parameter of positioning UE.MME transmits the eNB of this Location Request to the UE place, positions measurement by eNB, and to the response of MME restoring to normal position, comprising positioning result.After MME receives this positioning result, be transmitted to E-SMLC again.Calculate final position and the speed of UE by E-SMLC according to this positioning result, and estimate positioning accuracy.Last E-SMLC returns to MME with the final positioning result of UE.
Clearly show in the TS23.271 standard, can obtain the movement velocity of UE, comprise two parameters of speed and direction by the position fixing process that MME initiates.In the TS23.032 standard standard expression of movement rate in the positioning result (mainly referring to horizontal rate in the embodiment of the invention) with the direction of motion, as shown in Figure 2, wherein, the range value of velocity is represented speed, binary number N with one 16 bit (bit) in the TS23.032 standard represents, whenever advances the increment of a bit representation 1 km (km)/hour (h).
The angle of velocity and direct north (clockwise direction) is represented the direction of motion of UE, represents (N does not get the value within [360,511]) with the binary number N of 9bit, whenever advances the increment of a bit representation 1 degree.
Therefore, the embodiment of the invention proposes the method by the auxiliary TA List distribution of positioning service (LCS).MME initiates Location Request under felicity conditions such as TAU, obtain after UE positional information and the velocity information from location response, and MME just can distribute suitable TA List for UE.Because therefore the direction of motion of the UE that the location obtains and actual direction and the speed that movement rate can embody UE more exactly can distribute more suitable TA List for UE by the TA List distribution method that the embodiment of the invention provides.
The allocative decision of the TA List that the embodiment of the invention is provided below in conjunction with accompanying drawing describes.
Referring to Fig. 3, the overall procedure of the distribution method of a kind of TAList that the embodiment of the invention provides comprises step:
S101, when satisfying preset triggering conditions, MME determines the movement rate and the direction of motion of UE by initiating the position fixing process to UE.
S102, MME are UE distribution T AList according to the movement rate and the direction of motion of UE.
Preferably, the trigger condition described in the step S101 is:
MME receives tracing section updating request (TAU Request) message that UE sends, adheres to request (Attach Request) message or service request (Service Request) message.
Preferably, when the trigger condition described in the step S101 is MME when receiving TAURequest message that UE sends or Attach Request message,
If MME is before TAU process that UE initiates or Attach process are finished, can't be by initiating the position fixing process of UE is determined the movement rate and the direction of motion of UE, then MME is according to the sign (current TAI) and the cell ID age (Cell ID Age) of the sign (last visited TAI) of the tracking area of the last visit of UE, current tracking area, determine the movement rate and the direction of motion of UE, and be UE distribution T A List according to the movement rate and the direction of motion of UE.
Preferably, if in the Preset Time section of MME after the TAU process that UE initiates is finished, the movement rate and the direction of motion of UE have been determined by position fixing process, and having set up user's face at UE described in this TAU process connects, then MME is UE distribution T A List according to the movement rate and the direction of motion of this UE again, and by GUTI Relocation process the TA List that redistributes is notified to UE.Wherein, described Preset Time section can be configured among the MME according to actual needs by operator.
Preferably, this method also comprises:
MME accepts (TAU Accept) message, adheres to acceptance (Attach Accept) message or heavy assignment commands (the GUTI Relocation Command) message of global unique temporary identity by tracing section updating, will be notified to UE for the TAList that UE distributes.
Preferably, MME can determine the movement rate and the direction of motion of UE by repeatedly initiating the position fixing process to UE.
For the UE that is in connection status, consider the inaccuracy of one-time positioning, so MME can initiate repeatedly Location Request, after MME thinks that the information that obtains is enough to distribute a suitable TA List, can no longer send Location Request.
Because UE has been in connection status, initiates Location Request and need not pass through paging.MME comprehensively determines the direction of motion and the movement rate of UE according to a plurality of results of returning, and distribution T A List in view of the above.If TAU just in time takes place in this moment, then returns the TAList that is distributed in TAU accept message; Otherwise, in GUTI Relocation process, return the TA List that is distributed.The repeatedly time interval between the location, location number of times and can be provided with according to actual needs to the processing of positioning result repeatedly.
Preferably, step S102 comprises:
Step 1: MME is according to the speed of UE, and the corresponding relation of UE speed that sets in advance and tracking area (TA) quantity, is defined as the TA quantity that UE distributes;
Step 2: MME is according to the TA quantity of distributing for UE, and the direction of motion of UE, is defined as the TA that UE distributes, and is generated as the TAList that UE distributes.
The embodiment of the invention is that example describes with the situation that the MME of same UE does not change, and still, the scheme that the embodiment of the invention proposes is equally applicable to the situation that the MME of same UE changes.
Provide more specifically scheme explanation below.
For example, referring to Fig. 4, when TAU takes place in UE, UE sends TAU Request message to MME, MME receives after the TAU Request message, sends position requests (LocationRequest) message to E-SMLC, initiates the position fixing process to UE as shown in Figure 1, E-SMLC is according to LocationRequest message decision localization method, beginning position fixing process.
Wherein, comprise the position of asking UE and the information of speed in the Location Request message, can also comprise service quality (QoS) information, comprise the LCS response time of required precision and expectation etc. in the QoS information, wherein, the value of LCS response time should be less than the average time of TAU.
E-SMLC returns the UE positional information and the motion velocity information (comprising the movement rate and the direction of motion) of acquisition to MME.
MME is according to UE position, movement rate and the direction of motion, for this UE distributes suitable TAList.Wherein, the UE position and the direction of motion are mainly used in and select TA, movement rate to be used for the TA number that determines that TA List comprises.The value difference of the N of expression movement rate size, corresponding different TA numbers.In advance rate value is divided into different intervals, corresponding different respectively TA numbers.MME distributes the TA of respective number according to the speed interval under the rate value that returns in position response (Location Response) message for this UE.N is big more, and speed is high more, and the TA number of distribution is also many more, if when speed is lower than certain value, can only current (current) TA be covered among the TA List.If do not receive the LCS response before TAU finishes, then MME adopts prior art distribution T AList.If receive the LCS response in the certain hour after the TAU process is finished, and UE has set up user's face connection (being that UE enters connection status) in this TAU process, can redistribute TA List according to this LCS response, and be updated to the TA List that UE distributes by GUTI Relocation process.But,, just can only adopt prior art distribution T A List if the Attach process is not received the LCS response before finishing for the Attach process.
Be example with two scenes below, technical scheme and prior art that the embodiment of the invention is provided compare.
Scene one:
As shown in Figure 5, the movement locus of wherein representing UE with the line of arrow.Suppose UE when TAU takes place TA1, the TAI List that MME distributes comprises TA1 to TA4.TAU (except periodicity TAU) can not take place when mobile in UE in the zone of this TAI List.
Suppose that UE before generating period TAU, moves to TA5 from TA4, TAU takes place.If the employing prior art, MME is only according to time interval of this twice TAU, and the speed of the distance calculation UE between two sub-districts, and its resultant error may be very big, because:
One, MME is unknowable to the movement locus of UE, and the direction of motion of UE is difficult to judge.MME only knows that UE moves to TA5 from TA4, and more specifically direction MME can't be known, thereby can not be according to its direction characteristics distribution T AI List, and this point is particularly evident to the customer impact of high-speed motion.
Two, the movement velocity of UE is difficult to judge.UE may arrive TA4 with low-speed motion earlier in TAI List, high-speed motion also may change the direction low-speed motion to TA5 from the TA1 high-speed motion to TA4 then to TA5 then.Obviously, the speed that estimates according to existing information can not be represented the actual motion speed of UE.
Therefore, estimate the distribution that the method for the direction of motion of UE and movement rate can not be assisted TAI List well according to time interval of last visited TAI, current TAI and twice TAU.
And the technical scheme that adopts the embodiment of the invention to provide, when UE moved to TA5, because entered a not TA in current TA List, UE initiated the TAU process.MME receives that decision will be initiated the LCS process after this TAU Request message, then initiates position requests to E-SMLC.In position requests, will ask the desired precision of speed and location of UE.E-SMLC begins position fixing process, and positioning result is returned to MME.MME receives after the positioning result, according to the UE direction of motion and rate information, distributes the TA List of the TA that comprises suitable quantity, and be notified to UE in TAU Accept message.
Scene two:
As shown in Figure 6, suppose that the UE of high-speed mobile carries out TAU in TA1, MME has distributed a TAI List for it, and according to the UE direction of motion and the speed estimated, this TAList comprises TA1 to TA7.UE was still among the TA4 after motion a period of time.
If adopt existing method, MME can not trace into the change of UE speed fast, has only and could estimate also distribution T A List again of UE speed when UE is periodic TAU.But the time of latent period TAU timer expiry may be grown (about 1 hour), if during this period of time initiate paging, the paging amount is still very big; And, because the velocity estimation error may not be distributed a TAList who is suitable for static UE most, and can not be realized the optimization of TAU frequency and paging amount.
And the technical scheme that adopts the embodiment of the invention to provide, after being still in the TA4 of its TAList, the UE of high-speed motion enters connection status, and sent Service Request message to MME, MME can adopt the auxiliary method of LCS, can determine that through the one or many location UE is static, therefore can distribute a smaller TA List, and in TAU or GUTI Relocation process, this TA List is notified to UE.
In summary, in the scheme that the auxiliary TA List of the LCS that the embodiment of the invention provides distributes, the change of the MME of same UE to the location of this UE and be this UE distribution T AList without any influence, be this UE distribution T A List always by the current MME of UE; This scheme can both be suitable for for the UE of connected state and Idle state, and can trace into the variation of UE speed quickly, knows the movement characteristic of UE, and distributes a suitable TA List in view of the above.
Referring to Fig. 7, a kind of MME that the embodiment of the invention provides comprises:
UE movement velocity determining unit 11 is used for when satisfying preset triggering conditions, by initiating the position fixing process to UE, determines the movement rate and the direction of motion of UE.
TA List allocation units 12 are used for the movement rate and the direction of motion according to UE, are UE distribution T A List.
Preferably, UE movement velocity determining unit 11 comprises:
Preferably, if described triggered location unit 111 when TAU Request message that receives the UE transmission or Attach Request message, triggers described positioning unit 112; And, described positioning unit 112, in tracing section updating TAU process that UE initiates or adhere to before the Attach process finishes, can't be by initiating the position fixing process of UE is determined the movement rate and the direction of motion of UE, then described UE movement velocity determining unit 11 also comprises:
Stand-by unit 113 is used for the sign according to the tracking area of the last visit of UE, the sign and the cell ID age of current tracking area, determines the movement rate and the direction of motion of UE.
Preferably, described positioning unit 112, if in the Preset Time section after the TAU process that UE initiates is finished, the movement rate and the direction of motion of UE have been determined by position fixing process, and this UE has set up the connection of user's face in this TAU process, TA List allocation units 12 then are UE distribution T A List according to the movement rate and the direction of motion of this UE again.
Preferably, this MME also comprises:
Preferably, described UE movement velocity determining unit 11 by repeatedly initiating the position fixing process to UE, is determined the movement rate and the direction of motion of UE.
Preferably, described TA List allocation units 12 comprise:
TA quantity determining unit 121 is used for the speed according to UE, and the corresponding relation of UE speed that sets in advance and tracking area TA quantity, is defined as the TA quantity that UE distributes.
In sum, the embodiment of the invention is when satisfying preset triggering conditions, and MME determines the movement rate and the direction of motion of UE by initiating the position fixing process to UE; MME is UE distribution T A List according to the movement rate and the direction of motion of UE, thereby by determining the movement rate and the direction of motion of UE more exactly, has improved the reasonability that TA List distributes.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. the distribution method of a tracking area identification list TA List is characterized in that, this method comprises:
When satisfying preset triggering conditions, Mobility Management Entity MME determines the movement rate and the direction of motion of described UE by initiating the position fixing process to user equipment (UE);
Described MME is described UE distribution T A List according to the movement rate and the direction of motion of described UE.
2. method according to claim 1 is characterized in that, described trigger condition is:
Described MME receives tracing section updating request TAU Request message that described UE sends, adheres to request Attach Request message or service request Service Request message.
3. method according to claim 2 is characterized in that, when described trigger condition is described MME when receiving TAU Request message that described UE sends or Attach Request message,
If described MME is in tracing section updating TAU process that described UE initiates or adhere to before the Attach process finishes, can't be by initiating the position fixing process of described UE is determined the movement rate and the direction of motion of described UE, then described MME is according to the sign and the cell ID age of the sign of the tracking area of the last visit of described UE, current tracking area, determine the movement rate and the direction of motion of described UE, and be described UE distribution T A List according to the movement rate and the direction of motion of described UE.
4. method according to claim 3, it is characterized in that, if in the Preset Time section of described MME after the TAU process that described UE initiates is finished, the movement rate and the direction of motion of described UE have been determined by described position fixing process, and having set up user's face at UE described in this TAU process connects, then described MME is described UE distribution T AList according to the movement rate and the direction of motion of this UE again, and heavily distributes in the GUTI Relocation process in global unique temporary identity the TA List that redistributes is notified to described UE.
5. method according to claim 1 is characterized in that, this method also comprises:
Described MME accepts TAU Accept message, adheres to and accept Attach Accept message or the heavy assignment commands GUTI of global unique temporary identity Relocation Command message by tracing section updating, will be notified to described UE for the TA List that described UE distributes.
6. method according to claim 1 is characterized in that, described MME determines that by initiating the position fixing process to described UE the movement rate of described UE and the step of the direction of motion comprise:
Described MME determines the movement rate and the direction of motion of described UE by the position fixing process of one or many initiation to described UE.
7. according to the described method of the arbitrary claim of claim 1 to 6, it is characterized in that described MME is according to the movement rate and the direction of motion of described UE, for the step of described UE distribution T A List comprises:
Described MME is according to the speed of described UE, and the corresponding relation of UE speed that sets in advance and tracking area TA quantity, is defined as the TA quantity that described UE distributes;
Described MME is according to the TA quantity that is described UE distribution, and the direction of motion of described UE, is defined as the TA that described UE distributes, and is generated as the TA List that described UE distributes.
8. Mobility Management Entity MME device is characterized in that described device comprises:
UE movement velocity determining unit is used for when satisfying preset triggering conditions, by initiating the position fixing process to user equipment (UE), determines the movement rate and the direction of motion of described UE;
TA List allocation units are used for the movement rate and the direction of motion according to described UE, are described UE distribution T A List.
9. device according to claim 8 is characterized in that, described UE movement velocity determining unit comprises:
The triggered location unit is used for when the tracing section updating request TAU Request message that receives described UE transmission, when adhering to request Attach Request message or service request Service Request message the triggered location unit;
Positioning unit when being used to receive the triggering of described triggered location unit, is initiated the position fixing process to described UE, and determines the movement rate and the direction of motion of described UE.
10. device according to claim 9 is characterized in that, if described triggered location unit when TAU Request message that receives described UE transmission or Attach Request message, triggers described positioning unit; And, described positioning unit, in tracing section updating TAU process that described UE initiates or adhere to before the Attach process finishes, can't be by initiating the position fixing process of described UE is determined the movement rate and the direction of motion of described UE, then described UE movement velocity determining unit also comprises:
Stand-by unit is used for the sign according to the tracking area of the last visit of described UE, the sign and the cell ID age of current tracking area, determines the movement rate and the direction of motion of described UE.
11. device according to claim 10, it is characterized in that, described positioning unit, if in the Preset Time section after the TAU process that described UE initiates is finished, determined the movement rate and the direction of motion of described UE by described position fixing process, and, set up user's face at UE described in this TAU process and connected, then described TA List allocation units are described UE distribution T A List according to the movement rate and the direction of motion of this UE again.
12. device according to claim 8 is characterized in that, described device also comprises:
Notification unit, be used for accepting TAU Accept message, adhering to and accept AttachAccept message or the heavy assignment commands GUTI of global unique temporary identity Relocation Command message, will be notified to described UE for the TA List that described UE distributes by tracing section updating.
13. device according to claim 8 is characterized in that, described UE movement velocity determining unit by the position fixing process of one or many initiation to described UE, is determined the movement rate and the direction of motion of described UE.
14. to the described device of 13 arbitrary claims, it is characterized in that according to Claim 8 described TA List allocation units comprise:
TA quantity determining unit is used for the speed according to described UE, and the corresponding relation of UE speed that sets in advance and tracking area TA quantity, is defined as the TA quantity that described UE distributes;
The TA determining unit is used for according to the TA quantity for described UE distribution, and the direction of motion of described UE, is defined as the TA that described UE distributes, and is generated as the TA List that described UE distributes.
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