CN101969689A - Method for realizing time synchronization and method for obtaining dispatching information - Google Patents
Method for realizing time synchronization and method for obtaining dispatching information Download PDFInfo
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Abstract
The invention provides a method for realizing time synchronization and a method for obtaining dispatching information. A control surface X2 time synchronization control message and a control surface X2 time synchronization control response message are adopted between a service evolved node B (eNB) and a synergic eNB, the X2 interface time delay information of each synergic eNB is respectively stored in the service eNB, and the time synchronization of the service eNB and the synergic eNB is realized by the X2 interface time delay information. Meanwhile, when the service eNB transmits dispatching information to the synergic eNB, the dispatching information is transmitted to the synergic eNB ahead of the time shown as the X2 interface time delay information, and the method ensures that the dispatching information just falls into a time window allowed by the synergic eNB when arriving at the synergic eNB, thereby ensuring the normal realization for obtaining the dispatching information by the synergic eNB.
Description
Technical field
The present invention relates to Long Term Evolution (LTE, Long Term Evolution)/senior Long Term Evolution (LTE-A, Long Term Evolution Advanced) technology, especially refer among a kind of LTE/LTE-A, base station (the eNB of evolution, Evolved NodeB) realize the method for time synchronized between, and cooperation eNB obtains the method for schedule information.
Background technology
The LTE network of 3G (Third Generation) Moblie is by the universal land radio access web (E-UTRAN of evolution, Evolved Universal Terrestrial Radio Access Network) and the packet-based core networks (EPC, Evolved Packet Core) of evolution form.E-UTRAN comprises the set of eNB, and EPC comprises mobile management entity (MME, Mobile Management Entity) and gateway (S-GW, Serving Gateway) etc.ENB is connected by the S1 interface with MME/S-GW, can connect by X2 interface between the eNB.S1 interface and X2 interface are logic interfacing.A MME/S-GW can manage one or more eNB, and an eNB also can be controlled by a plurality of MME/S-GW.An eNB can manage one or more sub-districts.The LTE-A system is by the LTE system evolved, and the network architecture is consistent with LTE.In LTE-A, adopted some to come the enhanced system performance as the new technology of coordinate multipoint (CoMP, Coordinated Multipoint), spectrum aggregating and relaying (Relay).
In E-UTRAN, the data of Uplink/Downlink are by last/DSCH Downlink Shared Channel transmission.Give each subscriber equipment (UE, User Equipment) by the eNB Resources allocation.The access technology that E-UTRAN adopts is OFDM (OFDM, an Orthogonal Frequency Division Multiplexing) technology, its Radio Resource life period and frequency bidimensional.To being positioned at the UE that eNB covers the edge, may receive wireless signal simultaneously near several adjacent eNB, the wireless signal of its emission also can be received by near a plurality of eNB.In this case, can coordinate a plurality of eNB carries out receiving uniting of up-downgoing data and sending CoMP technology that Here it is to this UE simultaneously.Utilize CoMP and relevant signal processing technology, can on the up-downgoing wireless signal, obtain the gain of data diversity and spatial reuse, to improve the reliability and the data throughout of wireless data transmission.
A plurality of neighbor cells of CoMP participating cooperation may belong to same eNB, also may belong to different eNB (being also referred to as Inter eNB).When the CoMP cooperation occurred between different e NB, UE only accepted the instruction of up-downgoing scheduling of resource on the Physical Downlink Control Channel of an eNB (PDCCH, Physical downlink control channel) therein.This eNB is called service eNB (Serving eNB), other be called non-service eNB (Non-Serving eNB) or the cooperation eNB (Collaborative eNB).Under the CoMP scene that a plurality of eNB participate in, in order to reach the purpose that the up-downgoing data aggregate sends, receives, service eNB need send to cooperation eNB by X2 interface with the scheduling of resource instruction, thereby cooperation eNB can send data or receive data from UE to UE on identical time, frequency resource with service eNB.
Dynamic resource scheduling regulation according to the LTE/LTE-A system, scheduling downlink resource adopts asynchronous system, UE receives descending scheduling instruction (Downlink Assignment) and downlink data receiving occurs in same Transmission Time Interval (TTI, Transport Time Interval is 1ms); Ascending resource scheduling adopts the method for synchronization, sends upstream data after receiving upstream data permission (Uplink Grant) back 3 TTI.
Under the CoMP of Inter eNB scene, because the propagation delay time of X2 interface, cooperation eNB receives the hysteresis that resource scheduling information has certain hour from service eNB.At down direction, before cooperation eNB received resource scheduling information and carries out data transmission preparation, service eNB can not send the descending scheduling instruction to UE on its PDCCH channel.Therefore, for the eNB that guarantees to cooperate can send data or receive data from UE to UE on identical time, frequency resource with service eNB, service eNB need be given the time of capable dispatch command according to the corresponding postponement of X2 propagation delay time to UE.At up direction, service eNB also needs to send out to UE according to the corresponding postponement of propagation delay time of X2 interface the time of upstream data permission equally.This just requires service eNB can know in advance and the propagation delay time on the X2 interface between eNB of cooperating, so that CoMP etc. need the technology of time synchronized between eNB can operate as normal.
At present, in the LTE/LTE-A system, do not provide between eNB the method that realizes time synchronized in the prior art, thus the normal realization that the eNB that can not guarantee to cooperate obtains schedule information.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that realizes time synchronized, can guarantee the time synchronized between eNB.
Another object of the present invention is to provide a kind of method of obtaining schedule information, can guarantee the time synchronized between eNB, thereby guarantee the normal realization that cooperation eNB obtains schedule information.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that realizes time synchronized, this method comprises:
Serve evolution base station eNB and cooperate between the eNB, adopt the mutual of chain of command X2 time synchronized control messages and chain of command X2 time synchronized control response message, in service eNB, preserve the X2 interface time delay information of each cooperation eNB respectively.
Described X2 interface time delay information is X2 interface one way time delay.
In described service eNB parameter T4 is set, is used to write down the time point information that service eNB receives chain of command X2 time synchronized control response message;
Described service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, carries to show that service eNB sends the parameter T1 of the time point information of X2 time synchronized control messages in chain of command X2 time synchronized control messages;
After described cooperation eNB receives chain of command X2 time synchronized control messages, return chain of command X2 time synchronized control response message to described service eNB, in chain of command X2 time synchronized control response message, carry and show that cooperation eNB receives the parameter T2 of the time point information of X2 time synchronized control messages, shows that cooperation eNB sends the parameter T3 of time point information of chain of command X2 time synchronized control response message and the parameter T1 of acquisition;
Described service eNB is calculated X2 interface one way time delay according to following formula: X2 interface one way time delay=((parameter T4-parameter T1)-(parameter T3-parameter T2))/2.
In described service eNB parameter T4 is set, is used to write down the time point information that service eNB receives chain of command X2 time synchronized control response message;
Described service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, carries the sequence number that is used to identify this time synchronized control procedure in chain of command X2 time synchronized control messages; Simultaneously, described service eNB is preserved described sequence number and parameter T1 in this locality;
After described cooperation eNB receives chain of command X2 time synchronized control messages, return chain of command X2 time synchronized control response message to described service eNB, in chain of command X2 time synchronized control response message, carry sequence number, parameter T2 and the parameter T3 that receives;
Service eNB receives chain of command X2 time synchronized control response message, more described sequence number and the local sequence number of preserving, if the two is identical, then calculate X2 interface one way time delay: X2 interface one way time delay=((parameter T4-parameter T1)-(parameter T3-parameter T2))/2 according to following formula; If the two difference then abandons the chain of command X2 time synchronized control response message that receives.
This method also comprises: if described service eNB in the time that sets in advance, is not received the chain of command X2 time synchronized control response message that sequence number is identical, then abandon this time synchronized control procedure.
This method also comprises: described service eNB adopts new sequence number to begin new time synchronized control procedure.
Also carry in the described chain of command X2 time synchronized control messages as the cooperation eNB of purpose eNB sign with as the service eNB sign of source eNB;
Also carry in the described chain of command X2 time synchronized control response message as the service eNB of purpose eNB sign with as the cooperation eNB sign of source eNB.
Also comprise before this method:
Described service eNB is set up successfully with the X2 interface of cooperating between eNB; Perhaps,
Set in advance the Event triggered that is used to trigger the process that realizes time synchronized; Perhaps,
Set in advance the cycle that is used to trigger the process that realizes time synchronized.
A kind of method of obtaining schedule information, this method comprises:
In service eNB, get access to the initial value of the X2 interface time delay information of cooperation eNB in advance; In cooperation eNB, time window is set;
Service eNB is according to the X2 interface time delay information to cooperation eNB, and the time shown in the X2 interface time delay information sends schedule information to cooperation eNB in advance;
Cooperation eNB judges the time point of receiving schedule information and drops in the time window, cooperation eNB receiving scheduling information.
This method also comprises: can not drop in the described time window that sets if described cooperation eNB judges the time point of receiving schedule information, then calculation delay is adjusted side-play amount, and the initial value of X2 interface time delay information is adjusted.
Described time window comprises:
The final time LTOA that represents the arrival of the time the latest that schedule information that described service eNB is sent out is allowed when arriving cooperation eNB; The final time LTOA of described arrival is for as the cooperation eNB of a relative reference point side-play amount according to the time point of the schedule information transmission/reception data of being received;
The arrival window end point time T OAWE that represents the desirable time the latest when schedule information that described service eNB is sent out arrives cooperation eNB; Described arrival window end point time T OAWE is the side-play amount of relative LTOA;
The arrival window starting point time T OAWS that represents desirable earliest time when schedule information that described service eNB is sent out arrives cooperation eNB; Described arrival window starting point time T OAWS is a side-play amount that arrives window end point time T OAWE relatively;
Represent that schedule information that described service eNB is sent out arrives the TOA time of advent of the time of cooperation eNB; Described time of advent, TOA was a side-play amount that arrives window end point time T OAWE relatively.
Described calculation delay is adjusted side-play amount and is specifically comprised:
Described cooperation eNB sends chain of command X2 time delay to service eNB and adjusts message, and notification service eNB does sth. in advance the time point that sends schedule information to cooperation eNB or delays;
Described chain of command X2 time delay is adjusted and is carried in the message ahead of time or the indication of delaying, and time delay adjustment side-play amount, and wherein, time delay is adjusted side-play amount and calculated by following formula:
Time delay adjustment side-play amount=| TOA-(TOAWS/2) |;
When described time of advent during TOA＜0, described chain of command X2 time delay is adjusted and is carried indication ahead of time in the message, and when described time of advent during TOA＞TOAWS, described chain of command X2 time delay is adjusted to carry in the message and delayed indication.
Described calculation delay is adjusted side-play amount and is specifically comprised:
Described cooperation eNB sends chain of command X2 time delay to service eNB and adjusts message, and described chain of command X2 time delay is adjusted and carried described time of advent of TOA in the message;
Described service eNB is adjusted side-play amount according to the TOA calculation delay time of advent that receives.
Described initial value adjustment to X2 interface time delay information comprises:
After described service eNB receives and adjusts message from the chain of command X2 time delay of cooperation eNB, in described chain of command X2 time delay adjustment message, carry indication ahead of time, service eNB will add time delay adjustment side-play amount to the X2 interface time delay information of the eNB that should cooperate, and store adjusted X2 interface time delay information;
Carry the indication of delaying in chain of command X2 time delay adjustment message, service eNB will deduct time delay to the X2 interface time delay information of the eNB that should cooperate and adjust side-play amount, and store adjusted X2 interface time delay information.
The technical scheme that provides from the invention described above as can be seen, service eNB with cooperate between the eNB, adopt chain of command X2 time synchronized control messages and chain of command X2 time synchronized control response message, be implemented in the X2 interface time delay information of preserving each cooperation eNB in the service eNB respectively, realized service eNB and the time synchronized of cooperating between eNB by this X2 interface time delay information.Simultaneously, service eNB is when cooperation eNB sends schedule information, shift to an earlier date the time shown in the X2 interface time delay information, eNB sends schedule information to cooperation, guaranteed that schedule information just in time drops in the cooperation time window that eNB allowed when arriving cooperation eNB, thereby guaranteed the normal realization that cooperation eNB obtains schedule information.
Description of drawings
Fig. 1 realizes the realization schematic diagram of the method for time synchronized for the present invention;
Fig. 2 obtains the flow chart of the method for schedule information for the present invention;
Fig. 3 is the schematic diagram of time window;
Fig. 4 is the realization schematic diagram of the method for realization time adjustment of the present invention.
Embodiment
Fig. 1 realizes the realization schematic diagram of the method for time synchronized for the present invention, as shown in Figure 1, service eNB with cooperate between the eNB, adopt chain of command X2 time synchronized control messages and chain of command X2 time synchronized control response message, be implemented in the X2 interface time delay information of preserving each cooperation eNB in the service eNB respectively, the X2 interface one way time delay that the X2 interface time delay information of mentioning just is meant herein.The initial value of this X2 interface time delay information can obtain by following two kinds of methods:
Method one: in service eNB with after the X2 interface between eNB of cooperating is set up successfully, service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, carries to show that service eNB sends the parameter T1 of the time point information of X2 time synchronized control messages in chain of command X2 time synchronized control messages.After cooperation eNB receives chain of command X2 time synchronized control messages, return chain of command X2 time synchronized control response message to service eNB, in chain of command X2 time synchronized control response message, carry and show that cooperation eNB receives the parameter T2 of the time point information of X2 time synchronized control messages, shows that cooperation eNB sends the parameter T3 of time point information of chain of command X2 time synchronized control response message and the parameter T1 of acquisition.In addition, in service eNB parameter T4 is set, be used to write down the time point information that service eNB receives chain of command X2 time synchronized control response message, like this, service eNB receive from the cooperation eNB chain of command X2 time synchronized control response message the time, can calculate in conjunction with entrained parameter T2, parameter T3, parameter T4 and parameter T1 in this chain of command X2 time synchronized control response message: can draw the time that X2 interface comes and goes to be needed by parameter T1 and parameter T4, can draw the time that cooperation eNB inter-process needs by parameter T2 and parameter T3.It is equal to suppose to come and go the required time, and then X2 interface one way time delay is as shown in Equation (1):
X2 interface one way time delay=((T4-T1)-(T3-T2))/2 (1)
Method two: service eNB is when sending chain of command X2 time synchronized control messages to cooperation eNB, adopt a sequence number (circulation) to identify this time synchronized control procedure as 0 to 65535, service eNB is preserved this sequence number and parameter T1 in this locality simultaneously, and, in service eNB parameter T4 is set, is used to write down the time point information that service eNB receives chain of command X2 time synchronized control response message.In chain of command X2 time synchronized control messages, carry this sequence number, in chain of command X2 time synchronized control response message, carry sequence number, parameter T2 and the parameter T3 that receives.When service eNB receives chain of command X2 time synchronized control response message, compare sequence number and the local sequence number of preserving in the chain of command X2 time synchronized control response message, if the two is identical, then continue follow-up calculating (as shown in Equation (1)) to X2 interface one way time delay; If the two difference then abandons the chain of command X2 time synchronized control response message that receives.If service eNB is never received the chain of command X2 time synchronized control response message that sequence number is identical in one long period (can set in advance), then abandon this time synchronized control procedure; Further, service eNB can begin new time synchronized control procedure with new sequence number.
Need to prove, obtaining of the initial value of X2 interface time delay information, except setting up the successfully back execution with the X2 interface of cooperating between eNB in service eNB, can also carry out at any time as required, as Event triggered, periodic triggers etc., so as in time to obtain and update service eNB in the service eNB of preserving to the X2 interface propagation delay time between each cooperation eNB.
Fig. 2 is the flow chart that the present invention obtains the method for schedule information, as shown in Figure 2, may further comprise the steps:
Step 200: the initial value that in service eNB, gets access to the X2 interface time delay information of cooperation eNB in advance.
The specific implementation of this step no longer repeats here referring to the description to Fig. 1.
Step 201: in cooperation eNB, time window is set.
Fig. 3 is the schematic diagram of time window, as shown in Figure 3, time window is by the final time (LTOA of the arrival that sets in advance, Latest Time of Arrival), arrive window end point time (TOAWE, Time of Arrival Window Endpoint), arrive window starting point time (TOAWS, Time of Arrival Window Startpoint) and form the time of advent (TOA, Time of Arrival).Wherein,
LTOA, the time the latest that is allowed when arriving cooperation eNB for schedule information that service eNB is sent out.LTOA is set to the side-play amount according to the time point of the schedule information transmission/reception data of being received as the cooperation eNB of relative reference point, value should be more than or equal to 0, be timing, expression is more Zao than reference point, is cooperation eNB and can sends/receive the needed time of data from the schedule information that receives from service eNB to carrying out all preparations.
TOAWE, the desirable time the latest when being sent out schedule information arrival cooperation eNB by service eNB.TOAWE is set to the side-play amount of relative LTOA, and value should be timing more than or equal to 0, represents more Zao than reference point.
TOAWS, desirable earliest time when being sent out schedule information arrival cooperation eNB by service eNB.TOAWS is set to the side-play amount of relative TOAWE, and value just should be, and represents more Zao than reference point.
TOA is the time of schedule information that service eNB is sent out arrival cooperation eNB.TOA is defined as the side-play amount of relative TOAWE, if value is represented more Zao than reference point TOAWE for just; If value is represented more late than reference point TOAWE for negative.
Among Fig. 3, service eNB sends schedule information according to the X2 interface time delay information lead of being stored.Position shown in the time point 31 is that schedule information arrives early than time window, position shown in the time point 32 is that schedule information arrives in time window, position shown in the time point 33 is that schedule information is later than time window arrival, and position shown in the time point 33 is that schedule information arrives in time window too late.
Step 202: service eNB is according to the X2 interface time delay information to cooperation eNB, and eNB sends schedule information to cooperation.
In this step, service eNB is considered Timing Advance when cooperation eNB sends schedule information, promptly shifts to an earlier date the time shown in the X2 interface time delay information, eNB sends schedule information to cooperation, so that schedule information arrives in the time window that just in time drops on TOAWS and TOAWE composition when cooperating eNB.
Step 203: cooperation eNB judges to receive whether the time point of schedule information drops in the time window, if enter step 204, otherwise enter step 205.
If schedule information arrives the time (being TOA) of cooperation eNB and can not drop in the time window that sets, promptly work as TOA than the Zao (TOA＞TOAWS), when perhaps TOA is than TOAWE late (TOA＜0), enter step 205 of TOAWS; If schedule information arrives the time of cooperation eNB and drops in the time window that sets, promptly TOA enters step 204 when late and TOA is than TOAWE Zao (TOA＜TOAWS and TOA＞0) than TOAWS.
Step 204: cooperation eNB receiving scheduling information.Process ends.
Step 205: calculation delay is adjusted side-play amount, and the initial value of X2 interface time delay information is adjusted.Return step 202.
If schedule information arrives the time of cooperation eNB and can not drop in the time window that sets, Fig. 4 is the realization schematic diagram of the method for realization time adjustment of the present invention, as shown in Figure 4, cooperation eNB can send chain of command X2 time delay to service eNB and adjust message, and notification service eNB does sth. in advance the time point that sends schedule information to cooperation eNB or delays.In chain of command X2 time delay is adjusted message, carry ahead of time or the indication of delaying (when TOA＜0, in chain of command X2 time delay adjustment message, carry indication ahead of time, when TOA＞TOAWS, in chain of command X2 time delay adjustment message, carry and delay indication) and time delay adjustment side-play amount, time delay is adjusted side-play amount and can be calculated by formula (2):
Time delay adjustment side-play amount=| TOA-(TOAWS/2) | (2)
The difference of the central point (is reference point with TOAWE) of formula (2) expression TOA and time window takes absolute value again.Need to prove that the calculating of adjusting side-play amount about time delay can be realized that also at this moment, cooperation eNB adjusts the TOA information that also carries in the message (being the time that schedule information arrives cooperation eNB) to the chain of command X2 time delay that service eNB sends by service eNB.
After service eNB receives and adjusts message from the chain of command X2 time delay of cooperation eNB, adjust the indication of doing sth. in advance or delaying and the time delay of carrying in the message according to this chain of command X2 time delay and adjust side-play amount, the X2 interface time delay information to the eNB that should cooperate of being preserved is revised, promptly adjust and carry indication ahead of time in the message when chain of command X2 time delay, service eNB will add time delay adjustment side-play amount to the X2 interface time delay information of the eNB that should cooperate, and store adjusted X2 interface time delay information; Carry the indication of delaying in chain of command X2 time delay adjustment message, service eNB will deduct time delay to the X2 interface time delay information of the eNB that should cooperate and adjust side-play amount, and store adjusted X2 interface time delay information.Like this, the schedule information that has guaranteed the follow-up transmission of service eNB can drop in the time window of setting when arriving cooperation eNB.
Need to prove that step 205 is an optional step.
Describe the inventive method in detail below in conjunction with embodiment.
Realize first embodiment of time synchronized.
In service eNB, preserve the X2 interface time delay information (comprising X2 interface one way time delay) of each cooperation eNB.Service eNB with cooperate after X2 interface is set up successfully between eNB, service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, comprises parameter T1 (sending the time point information of chain of command X2 time synchronized control messages for service eNB) in this chain of command X2 time synchronized control messages.ENB is after receiving chain of command X2 time synchronized control messages in cooperation, return chain of command X2 time synchronized control response message to service eNB, comprise parameter T2 (receiving the time point information of chain of command X2 time synchronized control messages for cooperation eNB), parameter T3 (sending the time point information of chain of command X2 time synchronized control response message for cooperation eNB) and the parameter T1 that receives in this chain of command X2 time synchronized control response message.In addition, service eNB recording parameters T4 (receiving the time point information of chain of command X2 time synchronized control response message for service eNB).
Like this, service eNB receive from the cooperation eNB chain of command X2 time synchronized control response message the time, can calculate in conjunction with entrained parameter T2, parameter T3 and parameter T1 in the chain of command X2 time synchronized control response message, the time that X2 interface comes and goes to be needed can be drawn by parameter T1 and parameter T4, the time that cooperation eNB inter-process needs can be drawn by parameter T2 and parameter T3.It is equal to suppose to come and go the required time, and then X2 interface one way time delay is: ((T4-T1)-(T3-T2))/2.
Wherein, the chain of command X2 time synchronized control messages content of carrying is as shown in table 1:
Table 1
The content that chain of command X2 time synchronized control response message is carried is as shown in table 2:
Table 2
Further, parameter T1 and parameter T4 are the time of service eNB side, and parameter T2 and parameter T3 are the time of cooperation eNB side.Suppose that it is n that there are deviation in time in the service eNB and the eNB that cooperates, then can also calculate this time deviation n.Particularly, if the time T of the time T ' corresponding with service eNB side of cooperation eNB side, if the time according to cooperation eNB side is represented, T1 '=parameter T1+n then, T4 '=parameter T4+n (supposes still that here service eNB comes and goes the required time to cooperation eNB and equates) because parameter T2-T1 '=T4 '-parameter T3, i.e. parameter T2-(parameter T1+n)=(parameter T4+n)-parameter T3, that is to say parameter T2-parameter T1-n=parameter T4-parameter T3+n.So deviation n can be obtained by formula (3):
Deviation n=((T2-T1)-(T4-T3))/2 (3)
Realize second embodiment of time synchronized.
In service eNB, preserve the X2 interface time delay information (comprising X2 interface one way time delay) of each cooperation eNB.Service eNB with cooperate after X2 interface is set up successfully between eNB, service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, adopt a sequence number (circulation as 0 to 65535) to identify this time synchronized control procedure in the present embodiment, service eNB is preserved this sequence number and parameter T1 (sending the time point information of chain of command X2 time synchronized control messages for service eNB) in this locality.Service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, comprises sequence number in this chain of command X2 time synchronized control messages.ENB is after receiving chain of command X2 time synchronized control messages in cooperation, return chain of command X2 time synchronized control response message to service eNB, comprise the sequence number, parameter T2 (receiving the time point information of chain of command X2 time synchronized control messages for cooperation eNB), the parameter T3 (sending the time point information of chain of command X2 time synchronized control response message for cooperation eNB) that receive in this chain of command X2 time synchronized control response message.When service eNB was received chain of command X2 time synchronized control response message, relatively the sequence number and the local sequence number of preserving in the chain of command X2 time synchronized control response message if the two is identical, then adopted formula (1) to calculate X2 interface one way time delay; If the two difference then abandons this chain of command X2 time synchronized control response message.
It is as shown in table 3 that chain of command X2 time synchronized control messages is carried content:
| Message content | Explanation |
| Cooperation eNB sign | As Global eNB ID (purpose). |
| The service eNB sign | As Global eNB ID (source). |
| Sequence number | Circulation as 0 to 65535. |
Table 3
It is as shown in table 4 that chain of command X2 time synchronized control response message is carried content:
Table 4
Obtain first embodiment of schedule information.
In service eNB, preserve the X2 interface time delay information (comprising X2 interface one way time delay) of each cooperation eNB.Method described in embodiment one that this X2 interface time delay information can be by realizing time synchronized or the embodiment two that realizes time synchronized obtains initial value.And adopt the chain of command X2 time delay adjustment message in time window shown in Figure 3 and the method shown in Figure 4 to come this X2 interface time delay information is revised.
Service eNB is being considered Timing Advance when cooperation eNB sends schedule information, that is to say, if wish that cooperation eNB is in reception/transmission data sometime, so, service eNB should shift to an earlier date a period of time to cooperation eNB transmission dispatch command at relative this time point, and this Timing Advance promptly is the X2 interface time delay information (comprising X2 interface one way time delay) of in the service eNB each cooperation eNB being preserved.
At cooperation eNB setting-up time window, concrete as description to Fig. 3.
If service eNB is being considered Timing Advance when cooperation eNB sends schedule information, but, schedule information can not drop in this time window the time of advent, promptly when TOA than the Zao (TOA＞TOAWS) of TOAWS, when perhaps TOA is than TOAWE late (TOA＜0), cooperation eNB should send out chain of command X2 time delay to service eNB and adjust message, and notification service eNB does sth. in advance the time point that sends schedule information to cooperation eNB or delays.Carry ahead of time in chain of command X2 time delay adjustment message or indication of delaying and time delay adjustment side-play amount, time delay is adjusted side-play amount and can be calculated by formula (2).
After service eNB receives and adjusts message from the chain of command X2 time delay of cooperation eNB, according in this message ahead of time or the indication of delaying and time delay adjust side-play amount, in the X2 interface time delay information of being preserved the record of the eNB that should cooperate being revised.So that being sent in when arriving cooperation eNB, can drop in the window of hope the follow-up of service eNB.
Wherein, it is as shown in table 5 that chain of command X2 time delay is adjusted the message content:
| Message content | Explanation |
| The service eNB sign | As Global eNB ID (purpose). |
| Cooperation eNB sign | As Global eNB ID (source). |
| The indication of doing sth. in advance or delaying | Such as 1 expression ahead of time, 0 expression is delayed etc. |
| Time delay is adjusted side-play amount | As being unit with ms. |
Table 5
Obtain second embodiment of schedule information.
As obtain the method described in first embodiment of schedule information, wherein the calculating of adjusting side-play amount about time delay also can be placed in the service eNB and carry out, at this moment, cooperation eNB carries TOA information in the chain of command X2 time delay adjustment message that service eNB is sent out.
The schedule information that sends to cooperation eNB when service eNB can not drop in the time window that TOAWS and TOAWE form when arriving cooperation eNB.Promptly Zao (TOA＞TOAWS), when perhaps TOA was than TOAWE late (TOA＜0), cooperation eNB should send chain of command X2 time delay to service eNB and adjust message, carried TOA information in this chain of command X2 time delay adjustment message than TOAWS as TOA.Service eNB utilizes the TOA information of wherein carrying to calculate after receiving chain of command X2 time delay adjustment message.When TOA＞TOAWS, the expression scheduling message arrives cooperation eNB early than time window, and therefore, the X2 interface one way time delay of being preserved need reduce; When TOA＜0, the expression scheduling message has arrived cooperation eNB evening, and therefore, the X2 interface one way time delay of preservation needs to increase.The time delay that need reduce or increase is adjusted side-play amount and is calculated acquisition by formula (2).
Wherein, it is as shown in table 6 that chain of command X2 time delay is adjusted the message content:
| Message content | Explanation |
| The service eNB sign | As Global eNB ID (purpose). |
| Cooperation eNB sign | As Global eNB ID (source). |
| TOA information | As being unit with ms. |
Table 6
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a method that realizes time synchronized is characterized in that, this method comprises:
Serve evolution base station eNB and cooperate between the eNB, adopt the mutual of chain of command X2 time synchronized control messages and chain of command X2 time synchronized control response message, in service eNB, preserve the X2 interface time delay information of each cooperation eNB respectively.
2. method according to claim 1 is characterized in that, described X2 interface time delay information is X2 interface one way time delay.
3. method according to claim 2 is characterized in that, in described service eNB parameter T4 is set, and is used to write down the time point information that service eNB receives chain of command X2 time synchronized control response message;
Described service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, carries to show that service eNB sends the parameter T1 of the time point information of X2 time synchronized control messages in chain of command X2 time synchronized control messages;
After described cooperation eNB receives chain of command X2 time synchronized control messages, return chain of command X2 time synchronized control response message to described service eNB, in chain of command X2 time synchronized control response message, carry and show that cooperation eNB receives the parameter T2 of the time point information of X2 time synchronized control messages, shows that cooperation eNB sends the parameter T3 of time point information of chain of command X2 time synchronized control response message and the parameter T1 of acquisition;
Described service eNB is calculated X2 interface one way time delay according to following formula: X2 interface one way time delay=((parameter T4-parameter T1)-(parameter T3-parameter T2))/2.
4. method according to claim 2 is characterized in that, in described service eNB parameter T4 is set, and is used to write down the time point information that service eNB receives chain of command X2 time synchronized control response message;
Described service eNB sends chain of command X2 time synchronized control messages to cooperation eNB, carries the sequence number that is used to identify this time synchronized control procedure in chain of command X2 time synchronized control messages; Simultaneously, described service eNB is preserved described sequence number and parameter T1 in this locality;
After described cooperation eNB receives chain of command X2 time synchronized control messages, return chain of command X2 time synchronized control response message to described service eNB, in chain of command X2 time synchronized control response message, carry sequence number, parameter T2 and the parameter T3 that receives;
Service eNB receives chain of command X2 time synchronized control response message, more described sequence number and the local sequence number of preserving, if the two is identical, then calculate X2 interface one way time delay: X2 interface one way time delay=((parameter T4-parameter T1)-(parameter T3-parameter T2))/2 according to following formula; If the two difference then abandons the chain of command X2 time synchronized control response message that receives.
5. method according to claim 4, it is characterized in that, this method also comprises: if described service eNB in the time that sets in advance, is not received the chain of command X2 time synchronized control response message that sequence number is identical, then abandon this time synchronized control procedure.
6. method according to claim 5 is characterized in that, this method also comprises: described service eNB adopts new sequence number to begin new time synchronized control procedure.
7. according to claim 3 or 4 described methods, it is characterized in that, also carry in the described chain of command X2 time synchronized control messages as the cooperation eNB of purpose eNB sign with as the service eNB sign of source eNB;
Also carry in the described chain of command X2 time synchronized control response message as the service eNB of purpose eNB sign with as the cooperation eNB sign of source eNB.
8. method according to claim 1 is characterized in that, also comprises before this method:
Described service eNB is set up successfully with the X2 interface of cooperating between eNB; Perhaps,
Set in advance the Event triggered that is used to trigger the process that realizes time synchronized; Perhaps,
Set in advance the cycle that is used to trigger the process that realizes time synchronized.
9. a method of obtaining schedule information is characterized in that, this method comprises:
In service eNB, get access to the initial value of the X2 interface time delay information of cooperation eNB in advance; In cooperation eNB, time window is set;
Service eNB is according to the X2 interface time delay information to cooperation eNB, and the time shown in the X2 interface time delay information sends schedule information to cooperation eNB in advance;
Cooperation eNB judges the time point of receiving schedule information and drops in the time window, cooperation eNB receiving scheduling information.
10. method according to claim 9, it is characterized in that, this method also comprises: can not drop in the described time window that sets if described cooperation eNB judges the time point of receiving schedule information, then calculation delay is adjusted side-play amount, and the initial value of X2 interface time delay information is adjusted.
11., it is characterized in that described time window comprises according to claim 9 or 10 described methods:
The final time LTOA that represents the arrival of the time the latest that schedule information that described service eNB is sent out is allowed when arriving cooperation eNB; The final time LTOA of described arrival is for as the cooperation eNB of a relative reference point side-play amount according to the time point of the schedule information transmission/reception data of being received;
The arrival window end point time T OAWE that represents the desirable time the latest when schedule information that described service eNB is sent out arrives cooperation eNB; Described arrival window end point time T OAWE is the side-play amount of relative LTOA;
The arrival window starting point time T OAWS that represents desirable earliest time when schedule information that described service eNB is sent out arrives cooperation eNB; Described arrival window starting point time T OAWS is a side-play amount that arrives window end point time T OAWE relatively;
Represent that schedule information that described service eNB is sent out arrives the TOA time of advent of the time of cooperation eNB; Described time of advent, TOA was a side-play amount that arrives window end point time T OAWE relatively.
12. method according to claim 11 is characterized in that, described calculation delay is adjusted side-play amount and is specifically comprised:
Described cooperation eNB sends chain of command X2 time delay to service eNB and adjusts message, and notification service eNB does sth. in advance the time point that sends schedule information to cooperation eNB or delays;
Described chain of command X2 time delay is adjusted and is carried in the message ahead of time or the indication of delaying, and time delay adjustment side-play amount, and wherein, time delay is adjusted side-play amount and calculated by following formula:
Time delay adjustment side-play amount=| TOA-(TOAWS/2) |;
When described time of advent during TOA＜0, described chain of command X2 time delay is adjusted and is carried indication ahead of time in the message, and when described time of advent during TOA＞TOAWS, described chain of command X2 time delay is adjusted to carry in the message and delayed indication.
13. method according to claim 11 is characterized in that, described calculation delay is adjusted side-play amount and is specifically comprised:
Described cooperation eNB sends chain of command X2 time delay to service eNB and adjusts message, and described chain of command X2 time delay is adjusted and carried described time of advent of TOA in the message;
Described service eNB is adjusted side-play amount according to the TOA calculation delay time of advent that receives.
14. method according to claim 12 is characterized in that, described initial value adjustment to X2 interface time delay information comprises:
After described service eNB receives and adjusts message from the chain of command X2 time delay of cooperation eNB, in described chain of command X2 time delay adjustment message, carry indication ahead of time, service eNB will add time delay adjustment side-play amount to the X2 interface time delay information of the eNB that should cooperate, and store adjusted X2 interface time delay information;
Carry the indication of delaying in chain of command X2 time delay adjustment message, service eNB will deduct time delay to the X2 interface time delay information of the eNB that should cooperate and adjust side-play amount, and store adjusted X2 interface time delay information.
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