CN107872856A - A kind of method and device for reducing handover delay - Google Patents

A kind of method and device for reducing handover delay Download PDF

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Publication number
CN107872856A
CN107872856A CN201610862958.0A CN201610862958A CN107872856A CN 107872856 A CN107872856 A CN 107872856A CN 201610862958 A CN201610862958 A CN 201610862958A CN 107872856 A CN107872856 A CN 107872856A
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handover
target enb
enb
scheme
schemes
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CN201610862958.0A
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CN107872856B (en
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李娜
丁飞
胡南
陈卓
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China Mobile Communications Group Co Ltd
China Mobile Communications Co Ltd
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China Mobile Communications Group Co Ltd
China Mobile Communications Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/165—Performing reselection for specific purposes for reducing network power consumption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Abstract

The present invention relates to wireless communication field, more particularly to a kind of method and device for reducing handover delay, this method are that source eNB receives the UE ability informations that UE is reported；Source eNB determines handover scheme according to the UE ability informations received, and is based on the handover scheme, and handover request is sent to target eNB, wherein, the handover scheme is at least carried in handover request；Source eNB receives the handover request ack message that target eNB is returned based on the handover request, if it is determined that when target eNB is carried in the handover request ack message to the confirmation of the handover scheme, instruction UE uses the handover scheme, complete switching, so, according to different application scenarios, source eNB and target eNB consult to determine handover scheme, neatly for UE determine suitable low time delay, low business interruption time handover scheme.

Description

A kind of method and device for reducing handover delay
Technical field
The present invention relates to wireless communication field, more particularly to a kind of method and device for reducing handover delay.
Background technology
In terminal (User Equipment, UE) handoff procedure, handover delay is for quality of service and grid Performance all generates large effect, and it is big as reduce handover delay one to reduce the business interruption time in handoff procedure Much-talked-about topic, increasingly attract attention.
Under prior art, there are following several schemes for reducing business interruption time in handoff procedure：
The first scheme：Without random access procedure (Random Access Channel-less, RACH less) switching side Case.
In practice, typical handover delay is 40-50ms, wherein, RACH occupies about 10-12ms.Therefore, eliminate and switched RACH time delays in journey will substantially reduce business interruption time, improve Consumer's Experience.
Existing RACH less handover schemes have following two：
1) RACH less handover schemes 1：UE is measured by target evolved base station (evolved Node B, eNB) to send Upward signal realize.
General principle is：Source eNB tells UE to send upward signal, such as detection reference signal in the time of agreement (Sounding Reference Signal, SRS), while tell the target eNB upward signals sent in time measurement UE. Based on the upward signal, target eNB calculates Timing Advance (Time Advanced, TA) value and sends it to source eNB, Then source eNB is handed down to UE by switching command (Handover Command, HO command).
2) RACH-less handover schemes 2：The downstream signal that target eNB is measured by UE is realized.
General principle is：As shown in fig.1, UE obtains the descending propagation time difference between cell-of-origin and Target cell first (i.e. T1-T2), the TA values for being then based on cell-of-origin obtain the TA values of Target cell (assuming that UL propagation delays and DL propagation delay phases Together), it is specially：
TAtarget=TAsource- 2 (T1-T2) (synchronizing networks)
TAtarget=TAsource- 2 (T1-T2)+Δ T (nonsynchronous network)
Wherein, Δ T (can just can bear) represents the sub-frame boundary deviation between source eNB and target eNB.
RACH less handover schemes simply easily realize that, to UE without additional capabilities requirement, still, uplink synchronous precision is by nothing Thread environment has a great influence.When UL propagation delays and DL propagation delays differ, certain interference can be brought to uplink system, Even it cannot be guaranteed that the reliable reception of business datum when serious.Further, since without RACH processes, it is necessary to which additional mechanism control is first The power of secondary uplink, power ascension and additional mechanism provide the ascending resource that UE sends Msg3, under prior art, and It is introduced not to this, i.e., performs flow for RACH less handover schemes are not specific.
Second scheme：Seamless (Seamless) handover scheme.
Referring particularly to shown in Fig. 2, UE keeps the company with source eNB during synchronization is completed with target eNB Connect.So can be to realize in handoff procedure without business data outage.
Seamless handover schemes can reach with current mechanism identical uplink synchronous precision property, realize in zero business It is disconnected, however, it is desirable to which UE, with double transmitting-receiving abilities, for the RACH less handover schemes that compare, implementation complexity is larger, overall Handover delay is longer.
As can be seen here, under prior art, the method that reduces handover delay, it is impossible to consider UE abilities and network environment, And different handover schemes is flexibly determined, also there is not the scheme of determination to RACH less specific execution flow.
The content of the invention
The embodiment of the present invention provides a kind of method and device for reducing handover delay, to solve switching side of the prior art Case is more single, it is impossible to the problem of flexibly determining suitable handover scheme according to different application scenarios.
Concrete technical scheme provided in an embodiment of the present invention is as follows：
A kind of method for reducing handover delay, including：
Source eNB receives the UE ability informations that UE is reported；
Source eNB determines handover scheme according to the UE ability informations received, and is based on the handover scheme, to target eNB Handover request is sent, wherein, the handover scheme is at least carried in handover request；
Source eNB receives the handover request ack message that target eNB is returned based on the handover request, however, it is determined that the switching When target eNB is carried in request response to the confirmation of the handover scheme, instruction UE uses the handover scheme, Complete switching.
Preferably, source eNB receives the UE ability informations that UE is reported, specifically include：
Source eNB receives the UE energy that UE asks the response message returned to report by the UE Capability queries sent based on source eNB Force information；Or,
Source eNB receives the UE ability informations that UE establishes information reporting by RRC connections.
Preferably, source eNB determines handover scheme, specifically included according to the UE ability informations received：
If according to UE ability informations, determine that UE has double transmitting-receiving abilities, then the handover scheme that source eNB is determined is following one kind Or any combination：RACH less handover schemes 1, RACH less handover schemes 2 and Seamless handover schemes；Or,
If according to UE ability informations, determine that UE does not have double transmitting-receiving abilities, then the handover scheme that source eNB is determined is with next Kind or any combination：RACH less handover schemes 1, RACH less handover schemes 2.
Preferably, the target eNB is target eNB to the confirmation of the handover scheme according to current network environment It is determined.
Preferably, further comprise：
If it is determined that handover scheme be RACH less handover schemes 1, then at least carried in the handover request UE transmission The time of upward signal, and in the handover request ack message, target eNB the first TA values are at least carried, wherein, institute Stating target eNB the first TA values is, target eNB sends the time of upward signal based on the UE received, according to preset algorithm meter Obtain；Or,
If it is determined that handover scheme be RACH less handover schemes 2, then when source eNB and target eNB are asynchronous, In the handover request ack message, source eNB and target eNB sub-frame boundary deviation is at least carried；Or,
If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, then the handover request In at least carry the time that UE sends upward signal, and in the handover request ack message, at least carry target eNB The first TA values；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, then the handover request In response message, at least when source eNB and target eNB are asynchronous, source eNB and target eNB sub-frame boundary deviation is carried.
Preferably, instruction UE uses the handover scheme, switching is completed, is specifically included：
If it is determined that handover scheme be RACH less handover schemes 1, it indicates that UE is entered using RACH less handover schemes 1 Row switching, and target eNB the first TA values are sent to UE, first TA values of the UE based on the target eNB is made, in target eNB Distribute to and upward signal is sent on UE ascending resource；Or,
If it is determined that handover scheme be RACH less handover schemes 2, it indicates that UE is entered using RACH less handover schemes 2 Row switching, and when it is determined that UE judge source eNB and target eNB meet uplink synchronous requirement when, make UE based on target eNB second TA values, distributed in target eNB and upward signal is sent on UE ascending resource；Wherein, the 2nd TA values of the target eNB, it is The UE is calculated according to the source eNB and target eNB of measurement downstream signal；Or,
If it is determined that handover scheme be Seamless handover schemes, it indicates that UE is cut using Seamless handover schemes Change, make the UE initiate RACH flows to target eNB；Or,
If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, it indicates that UE use RACH less handover scheme 1+Seamless handover schemes are switched over, and target eNB the first TA values are sent into UE, order First TA values of the UE based on the target eNB, distributes in target eNB and upward signal is sent on UE ascending resource；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE use RACH less handover scheme 2+Seamless handover schemes switch over, and will be as source eNB and target eNB asynchronous, source ENB and target eNB sub-frame boundary deviation is sent to the UE, and when determination UE is judged in source eNB and target eNB satisfactions Row makes twoth TA values of the UE based on target eNB when synchronously requiring, target eNB distribute to sent on UE ascending resource it is up Signal；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE use RACH less handover scheme 2+Seamless handover schemes switch over, and will be as source eNB and target eNB asynchronous, source ENB and target eNB sub-frame boundary deviation is sent to the UE, and when determination UE judges that source eNB and target eNB is unsatisfactory for During uplink synchronous requirement, UE is made to initiate RACH flows to target eNB.
Preferably, the target eNB distributes to UE ascending resource, it is that target eNB is sent to the UE by source eNB 's；Or,
The target eNB distributes to UE ascending resource, is that target eNB is sent to institute by way of default pre-scheduling State UE's；Or,
The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of dynamic dispatching 's.
A kind of device for reducing handover delay, including：
Receiving unit, the UE ability informations reported for receiving UE；
Processing unit, the UE ability informations received for basis, determines handover scheme, and is based on the handover scheme, Handover request is sent to target eNB, wherein, the handover scheme is at least carried in handover request；
Indicating member, the handover request ack message returned for receiving target eNB based on the handover request, however, it is determined that When target eNB is carried in the handover request ack message to the confirmation of the handover scheme, described in instruction UE is used Handover scheme, complete switching.
Preferably, when receiving the UE ability informations that UE is reported, receiving unit is specifically used for：
The UE abilities that UE asks the response message returned to report by the UE Capability queries sent based on source eNB are received to believe Breath；Or,
Receive the UE ability informations that UE establishes information reporting by radio resource control RRC connection.
Preferably, according to the UE ability informations received, when determining handover scheme, processing unit is specifically used for：
If according to UE ability informations, determine that UE has double transmitting-receiving abilities, then the handover scheme that source eNB is determined is following one kind Or any combination：RACH less handover schemes 1, RACH less handover schemes 2 and Seamless handover schemes；Or,
If according to UE ability informations, determine that UE does not have double transmitting-receiving abilities, then the handover scheme that source eNB is determined is with next Kind or any combination：RACH less handover schemes 1, RACH less handover schemes 2.
Preferably, the target eNB is target eNB to the confirmation of the handover scheme according to current network environment It is determined.
Preferably, further comprise：
If it is determined that handover scheme be RACH less handover schemes 1, then at least carried in the handover request UE transmission The time of upward signal, and in the handover request ack message, target eNB the first TA values are at least carried, wherein, institute Stating target eNB the first TA values is, target eNB sends the time of upward signal based on the UE received, according to preset algorithm meter Obtain；Or,
If it is determined that handover scheme be RACH less handover schemes 2, then when source eNB and target eNB are asynchronous, In the handover request ack message, source eNB and target eNB sub-frame boundary deviation is at least carried；Or,
If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, then the handover request In at least carry the time that UE sends upward signal, and in the handover request ack message, at least carry target eNB The first TA values；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, then the handover request In response message, at least when source eNB and target eNB are asynchronous, source eNB and target eNB sub-frame boundary deviation is carried.
Preferably, instruction UE uses the handover scheme, when completing switching, indicating member is specifically used for：
If it is determined that handover scheme be RACH less handover schemes 1, it indicates that UE is entered using RACH less handover schemes 1 Row switching, and target eNB the first TA values are sent to UE, first TA values of the UE based on the target eNB is made, in target eNB Distribute to and upward signal is sent on UE ascending resource；Or,
If it is determined that handover scheme be RACH less handover schemes 2, it indicates that UE is entered using RACH less handover schemes 2 Row switching, and when it is determined that UE judge source eNB and target eNB meet uplink synchronous requirement when, make UE based on target eNB second TA values, distributed in target eNB and upward signal is sent on UE ascending resource；Wherein, the 2nd TA values of the target eNB, it is The UE is calculated according to the source eNB and target eNB of measurement downstream signal；Or,
If it is determined that handover scheme be Seamless handover schemes, it indicates that UE is cut using Seamless handover schemes Change, make the UE initiate RACH flows to target eNB；Or,
If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, it indicates that UE use RACH less handover scheme 1+Seamless handover schemes are switched over, and target eNB the first TA values are sent into UE, order First TA values of the UE based on the target eNB, distributes in target eNB and upward signal is sent on UE ascending resource；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE use RACH less handover scheme 2+Seamless handover schemes switch over, and will be as source eNB and target eNB asynchronous, source ENB and target eNB sub-frame boundary deviation is sent to the UE, and when determination UE is judged in source eNB and target eNB satisfactions Row makes twoth TA values of the UE based on target eNB when synchronously requiring, target eNB distribute to sent on UE ascending resource it is up Signal；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE use RACH less handover scheme 2+Seamless handover schemes switch over, and will be as source eNB and target eNB asynchronous, source ENB and target eNB sub-frame boundary deviation is sent to the UE, and when determination UE judges that source eNB and target eNB is unsatisfactory for During uplink synchronous requirement, UE is made to initiate RACH flows to target eNB.
Preferably, the target eNB distributes to UE ascending resource, it is that target eNB is sent to the UE by source eNB 's；Or,
The target eNB distributes to UE ascending resource, is that target eNB is sent to institute by way of default pre-scheduling State UE's；Or,
The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of dynamic dispatching 's.
Beneficial effects of the present invention are as follows：
Source eNB receives the UE ability informations that UE is reported；Source eNB determines handover scheme according to the UE ability informations received, And above-mentioned handover scheme is based on, handover request is sent to target eNB, wherein, above-mentioned switching side is at least carried in handover request Case；Source eNB receives the handover request ack message that target eNB is returned based on above-mentioned handover request, however, it is determined that above-mentioned handover request When target eNB is carried in response message to the confirmation of above-mentioned handover scheme, instruction UE use above-mentioned handover scheme, completion Switching, so, according to UE ability informations, under different application scenarios, source eNB and target eNB consult to determine handover scheme, Neatly suitable low time delay, the handover scheme of low business interruption time are determined for UE.
Also, for when the different handover schemes used, giving specific execution method, realizing different Under handover scheme, the purpose of business interruption time in handover delay is reduced.
Brief description of the drawings
Fig. 1 is schematic diagram when UE switches in the prior art；
Fig. 2 is the flow chart of Seamless handover schemes in the prior art；
Fig. 3 is in the embodiment of the present invention, reduces handover delay method general introduction flow chart；
Fig. 4 is that application scenarios once reduce handover delay method detail flowchart in the embodiment of the present invention；
Fig. 5 is in the embodiment of the present invention, and application scenarios two decline low switching time delay method detail flowchart；
Fig. 6 is in the embodiment of the present invention, and application scenarios three decline low switching time delay method detail flowchart；
Fig. 7 is in the embodiment of the present invention, and application scenarios four decline low switching time delay method detail flowchart；
Fig. 8 is in the embodiment of the present invention, reduces handover delay apparatus structure schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, is not whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
It is more single in order to solve handover scheme of the prior art, it is impossible to consider different application scenarios and flexibly really The problem of making suitable handover scheme, in the embodiment of the present invention, source eNB according to UE ability informations and current network environment, Handover scheme is determined, and is indicated to target eNB, after target eNB confirmations, using the handover scheme, realizes UE switching.
The present invention program is described in detail below by specific embodiment, certainly, the present invention is not limited to following reality Apply example.
As shown in fig.3, in the embodiment of the present invention, the idiographic flow for reducing the method for handover delay is as follows：
Step 100：Source eNB receives the UE ability informations that UE is reported.
In practice, UE the handover scheme for reducing business interruption time in handoff procedure, has following when switching over Three kinds：RACH less handover schemes 1, RACH less handover schemes 2 and Seamless handover schemes.Wherein, RACH less are cut Changing the general principle of scheme 1 is, calculates target eNB TA values by the upward signal of target eNB measurement UE transmissions, realization is cut Change；The general principle of RACH less handover schemes 2 is that target eNB downstream signal calculating target eNB TA is measured by UE Value, realize switching；The general principle of Seamless handover schemes is, during UE and target eNB completes synchronization, protects Hold the connection with source eNB.
What deserves to be explained is the common thought of RACH less handover schemes 1 and RACH less handover schemes 2 is all to eliminate RACH time delays in handoff procedure, 1 and 2 differentiation here are intended merely to conveniently subsequently introduce both schemes, do not have it Significance of which.
In the embodiment of the present invention, above-mentioned three kinds of handover schemes are mainly based upon, can be according to different situation flexible configurations Different handover schemes, and give the specific implementation process of different handover schemes.
Wherein, UE ability informations, represent whether UE has double transmitting-receiving abilities.
When performing step 100, following two situations can be divided into：
The first situation：Source eNB receives the response message that UE asks to return by the UE Capability queries sent based on source eNB The UE ability informations reported.
That is, can send the request of UE Capability queries to UE in handoff preparation phase, source eNB, UE receives UE After Capability query request, UE ability informations are reported to source eNB.
Second of situation：Source eNB receives UE and connected by wireless heterogeneous networks (Radio Resource Control, RRC) Connect the UE ability informations for establishing information reporting.
That is, UE ability informations or being established in UE and source eNB during RRC is connected, connected by RRC Connect and establish information reporting and give source eNB.
Step 110：Source eNB determines handover scheme according to the UE ability informations received, and is based on above-mentioned handover scheme, Handover request is sent to target eNB, wherein, above-mentioned handover scheme is at least carried in handover request.
Wherein, in step 110, source eNB is according to the UE ability informations received, when determining handover scheme, can have with Lower two kinds of situations：
The first situation：If according to UE ability informations, determine that UE has double transmitting-receiving abilities, then the switching side that source eNB is determined Case is following a kind of or any combination：RACH less handover schemes 1, RACH less handover schemes 2 and Seamless switching sides Case.
Second of situation：If according to UE ability informations, determine that UE does not have double transmitting-receiving abilities, the then switching that source eNB is determined Scheme is following a kind of or any combination：RACH less handover schemes 1, RACH less handover schemes 2.
So, source eNB can configure different handover schemes according to UE ability informations, and how specific source eNB is from multiple In handover scheme that can be alternative, it is determined that current handover scheme, in the embodiment of the present invention, and it is not limited, source eNB can be from Any selection is a kind of in multiple handover schemes that can be alternative, or source eNB can according to current network environment, from it is multiple can be alternative Handover scheme in select it is a kind of.
Wherein, in step 110, after source eNB determines handover scheme, and above-mentioned handover scheme is based on, is sent to target eNB During handover request, it correspondingly can specifically be divided into following several situations：
The first situation：If it is determined that handover scheme be RACH less handover schemes 1, then source eNB is based on RACH less Handover scheme 1, handover request is sent to target eNB.Wherein, in handover request, the He of RACH less handover schemes 1 is at least carried UE sends the time of upward signal.
Second of situation：If it is determined that handover scheme be RACH less handover schemes 2, then source eNB is based on RACH less Handover scheme 2, handover request is sent to target eNB.Wherein, in handover request, RACH less handover schemes 2 are at least carried.
Further, in handover request, the radius information of cell-of-origin corresponding to the eNB of source can also be carried.So, can make The radius of Target cell, judges RACH less switching sides corresponding to radius information and target eNB of the target eNB based on cell-of-origin Whether case 2 is applicable.
The third situation：If it is determined that handover scheme be Seamless handover schemes, then source eNB based on Seamless switch Scheme, handover request is sent to target eNB.Wherein, in handover request, Seamless handover schemes are at least carried.
4th kind of situation：If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, then source ENB is based on RACH less handover scheme 1+Seamless handover schemes, and handover request is sent to target eNB.Wherein, switching please In asking, at least carry RACH less handover scheme 1+Seamless handover schemes and UE sends the time of upward signal.
5th kind of situation：If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, then source ENB is based on RACH less handover scheme 2+Seamless handover schemes, and handover request is sent to target eNB.Wherein, switching please In asking, RACH less handover scheme 2+Seamless handover schemes are at least carried.
Further, in handover request, the radius information of cell-of-origin corresponding to the eNB of source can be carried.
So, based on above-mentioned five kinds of situations, after source eNB determines handover scheme, can be indicated to that target eNB wishes to use cuts When changing scheme, and sending using the handover scheme simultaneously, required information, so that target eNB can be based on the information, judgement is It is no to use the handover scheme, and if target eNB agree to when use the handover scheme, can be directly according to information execution Follow-up operation.
Step 120：Source eNB receives the handover request ack message that target eNB is returned based on above-mentioned handover request, however, it is determined that When target eNB is carried in above-mentioned handover request ack message to the confirmation of above-mentioned handover scheme, instruction UE is using above-mentioned Handover scheme, complete switching.
Wherein, target eNB is that target eNB is determined according to current network environment to the confirmation of handover scheme , specifically it is described in detail in following several situations.
Based on five kinds of situations in step 110, when performing step 120, following several situations can also be divided into：
1) the first situation：If it is determined that handover scheme be RACH less handover schemes 1.
First, if target eNB agrees to use RACH less handover schemes 1, target eNB is carried pair to source eNB returns The handover request ack message of the confirmation of RACH less handover schemes 1.
Wherein, target eNB judges whether to agree to use RACH less handover schemes 1, is specially：Target eNB is based on receiving The UE arrived sends the time of upward signal, judges whether in the time be idle, i.e. whether target eNB can survey in the time Measure the upward signal that UE is sent, however, it is determined that be that then target eNB determines to agree to use RACH less handover schemes 1.
Further, in handover request ack message, target eNB the first TA values are carried, wherein, the target eNB The first TA values be that target eNB sends the time of upward signal based on the UE that receives, is calculated according to preset algorithm, Specially：The upward signal that target eNB is sent in time measurement UE, and the upward signal that the UE based on measurement is sent, are calculated Target eNB the first TA values.
Further, in handover request ack message, it is also possible to carry the ascending resource that target eNB distributes to UE, that is, use In the ascending resource for sending Msg3.
What deserves to be explained is if not having to carry the ascending resource that target eNB distributes to UE in handover request ack message, Then target eNB needs that ascending resource is sent to UE by way of pre-scheduling or dynamic dispatching.
Then, after source eNB receives handover request ack message, switching command is sent to UE, instruction UE uses RACH Less handover schemes 1 complete switching, and target eNB the first TA values are sent into UE.
Further, if in handover request ack message, the ascending resource that target eNB is sent to UE is carried, then source eNB The ascending resource that target eNB is distributed to UE is sent to UE.
Finally, first TA values of the UE based on above-mentioned target eNB, up letter is sent on the ascending resource of target eNB distribution Number, that is, complete switching.
2) second of situation：If it is determined that handover scheme be RACH less handover schemes 2.
First, if target eNB agrees to use RACH less handover schemes 2, target eNB is carried pair to source eNB returns The handover request ack message of the confirmation of RACH less handover schemes 2.
Wherein, target eNB judges whether to agree to use RACH less handover schemes 2, is specially：Target eNB is based on receiving The radius information for the cell-of-origin arrived, the difference of the radius of Target cell and the radius of cell-of-origin corresponding to target eNB is calculated, judged Whether the difference is more than predetermined threshold value, if so, then target eNB determines to disagree using RACH less handover schemes 2, otherwise, mesh Mark eNB agrees to use RACH less handover schemes 2.
Further, as source eNB and target eNB asynchronous, carrying source eNB and target are needed in handover request ack message Sub-frame boundary deviation between eNB.
Further, in handover request ack message, it is also possible to carry the ascending resource that target eNB distributes to UE.
Similarly, if not having to carry the ascending resource that target eNB distributes to UE, target in handover request ack message ENB needs that ascending resource is sent to UE by way of pre-scheduling or dynamic dispatching.
Then, after source eNB receives handover request ack message, switching command is sent to UE, instruction UE uses RACH Less handover schemes 2 complete switching.
Further, if in handover request ack message, the ascending resource that target eNB is sent to UE is carried, then source eNB The ascending resource that target eNB is distributed to UE is sent to UE.
Then, UE calculates target eNB the 2nd TA values, and judges whether source eNB and target eNB meets that uplink synchronous will Ask, when it is determined that meeting, it is determined that RACH less handover schemes 2 can be used.
Wherein, target eNB the 2nd TA values, it is downstream signals of the UE according to the source eNB and target eNB of measurement, calculates Arrive, specific computational methods and determination methods, have detailed introduction in subsequent applications scene, be just no longer described in detail here .
Finally, twoth TA values of the UE based on above-mentioned target eNB, up letter is sent on the ascending resource of target eNB distribution Number, that is, complete switching.
3) the third situation：If it is determined that handover scheme be Seamless handover schemes.
First, if target eNB agrees to use Seamless handover schemes, target eNB is carried pair to source eNB returns The handover request ack message of the confirmation of Seamless handover schemes.
Further, in handover request ack message, the Physical Random Access Channel that target eNB distributes to UE may be carried (Physical Random Access Channel, PRACH) information, for example, preamble codes.
Then, after source eNB receives handover request ack message, switching command is sent to UE, instruction UE is used Seamless handover schemes complete switching.
Finally, UE initiates RACH flows to target eNB.
What deserves to be explained is if in handover request ack message, the PRACH information that target eNB distributes to UE is carried, then PRACH information is sent to UE, and then the PRACH information that UE can be distributed based on target eNB by source eNB, is initiated to target eNB RACH flows；If in handover request ack message, not carrying the PRACH information that target eNB distributes to UE, then UE is used When Seamless handover schemes switch over, other resources can be used, actively initiate RACH flows to target eNB.
Wherein, RACH flows are performed, the method that the execution RACH flows under prior art can be used, the embodiment of the present invention In, with regard to no longer carrying out repeating.
4) the 4th kind of situation：If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes.
First, if target eNB agrees to use RACH less handover scheme 1+Seamless handover schemes, target eNB to Source eNB returns to the switching request response for carrying the confirmation to RACH less handover scheme 1+Seamless handover schemes Message.
Further, carried in handover request ack message, the first TA values for the target eNB that target eNB is calculated, The ascending resource that target eNB distributes to UE may also be carried, that is, is used for the ascending resource for sending Msg3.
Similarly, if not having to carry the ascending resource that target eNB distributes to UE, target in handover request ack message ENB needs that ascending resource is sent to UE by way of pre-scheduling or dynamic dispatching.
Then, after source eNB receives handover request ack message, switching command is sent to UE.
For example, source eNB can select one of them, instruction UE is switched over using one of handover scheme, for example, being RACH less handover schemes 1.
Finally, UE uses the handover scheme of source eNB instructions, completes switching.For example, first TA values of the UE based on target eNB, Distributed in target eNB and upward signal is sent on UE ascending resource.
Further, if target eNB has only replied confirmation to one of handover scheme, it is based only on target eNB The handover scheme of confirmation carries out follow-up operation, and concrete condition is further introduced again in follow-up application scenarios.
5) the 5th kind of situation：If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes.
First, if target eNB agrees to use RACH less handover scheme 2+Seamless handover schemes, target eNB to Source eNB returns to the switching request response for carrying the confirmation to RACH less handover scheme 2+Seamless handover schemes Message.
Further, may be carried in handover request ack message, target eNB distribute to UE PRACH information (such as Preamble codes), target eNB distribute to UE ascending resource, that is, be used for the ascending resource for sending Msg3, and when source eNB and mesh When mark eNB is asynchronous, the sub-frame boundary deviation between active eNB and target eNB is carried.
Similarly, if not having to carry the ascending resource that target eNB distributes to UE, target in handover request ack message ENB needs that ascending resource is sent to UE by way of pre-scheduling or dynamic dispatching.
Then, after source eNB receives handover request ack message, switching command is sent to UE.
For example, source eNB can select one of them, instruction UE is switched over using one of handover scheme, for example, being RACH less handover schemes 2.
Then, if RACH less handover schemes 2, then UE calculates target eNB the 2nd TA values, and judges source eNB and mesh Whether mark eNB meets uplink synchronous requirement, when it is determined that meeting, it is determined that RACH less handover schemes 2, otherwise, UE can be used Seamless handover schemes can be used further according to source eNB instruction.
Finally, handover schemes of the UE based on determination, switching is completed.
Further, if target eNB has only replied confirmation to one of handover scheme, it is based only on target eNB The handover scheme of confirmation carries out follow-up operation, and concrete condition is further introduced again in follow-up application scenarios.
That is, in the embodiment of the present invention, can (be, for example, source according to UE ability informations and current network environment Radius size of cell etc. corresponding to eNB and target eNB), source eNB and target eNB are consulted to decide using which kind of handover scheme, association Business's process is initiated by source eNB by handover request, and is confirmed by target eNB by handover request ack message, and then is terminal It is determined that suitable low switching time delay, the handover scheme of low business interruption time.
What deserves to be explained is target eNB the first TA values and target eNB the 2nd TA values, are not being sympathized with to distinguish Calculation is different under condition, without other implications, is described below in order to be more convenient for, by target eNB the first TA values and target eNB The 2nd TA values, be referred to as target eNB TA values.
Further description is made to above-described embodiment using several specific application scenarios below.
(1) application scenarios one：It is RACH less handover schemes 1 that UE, which does not have double transmitting-receiving abilities and handover scheme, and Target eNB confirms that RACH less handover schemes 1 are available, referring particularly to shown in Fig. 4, in the embodiment of the present invention, reduces switching The implementation procedure of the method for time delay is specific as follows：
Step 200：Source eNB sends the request of UE Capability queries to UE.
Step 201：UE reports UE ability informations to source eNB.
Wherein, in UE ability informations, instruction UE does not have double transmitting-receiving abilities.
Step 202：Source eNB sends handover request to target eNB.
Wherein, in handover request, instruction is wished to use RACH less handover schemes 1, and carries UE and send upward signal Time.
Step 203：The upward signal that target eNB is sent in time measurement UE, and the upward signal sent based on UE, meter Calculate target eNB TA values.
Wherein, the method that target eNB calculates target eNB TA values, in the embodiment of the present invention, it is not defined, can be with Calculated using existing method.
Step 204：Target eNB returns to handover request ack message to source eNB.
Wherein, in handover request ack message, confirmation and mesh of the target eNB to RACH less handover schemes 1 are carried ENB TA values are marked, further, the ascending resource for distributing to UE can be carried, i.e. UE is used for the ascending resource for sending Msg3.
If not having to carry the ascending resource for distributing to UE in handover request ack message, target eNB can also be by pre- Ascending resource is sent to UE by the mode of scheduling or dynamic dispatching.
Step 205：Source eNB sends switching command to UE, and instruction UE uses RACH less handover schemes 1, and carries target ENB TA values, further, if carrying the ascending resource for distributing to UE in handover request ack message, carry mesh simultaneously Mark eNB distributes to UE ascending resource.
Step 206：TA values of the UE based on above-mentioned target eNB, sent out on the ascending resource of target eNB distribution to target eNB Upward signal is sent, completes switching.
(2) application scenarios two：It is RACH less handover schemes 2 that UE, which does not have double transmitting-receiving abilities and handover scheme, and Target eNB confirms that RACH less handover schemes 2 are available, referring particularly to shown in Fig. 5, in the embodiment of the present invention, reduces switching The implementation procedure of the method for time delay is specific as follows：
Step 300：Source eNB sends the request of UE Capability queries to UE.
Step 301：UE reports UE ability informations to source eNB.
Wherein, in UE ability informations, instruction UE does not have double transmitting-receiving abilities.
Step 302：Source eNB sends handover request to target eNB.
Wherein, in handover request, instruction is wished to use RACH less handover schemes 2, possible, carries corresponding to the eNB of source Cell-of-origin radius information.
Step 303：If target eNB receives cell-of-origin radius information, based on cell-of-origin radius and Target cell radius Comparing result determine whether to use RACH less schemes 2.
Specially：The difference of the radius of Target cell and the radius of cell-of-origin corresponding to target eNB is calculated, judges the difference Whether predetermined threshold value is more than, if so, then target eNB determines to disagree using RACH less handover schemes 2, i.e., will not be to source eNB The confirmation of RACH less schemes 2 is returned to, otherwise, target eNB agrees to use RACH less handover schemes 2.
What deserves to be explained is step 303 is optional step, not necessarily have to carry out, judge whether that RACH can be used Less handover schemes 2 or source eNB are judged, when it is determined that can use, RACH is used to target eNB instructions Less handover schemes 2, at this moment, source eNB avoid the need for the radius information of cell-of-origin being sent to target eNB.
Step 304：Target eNB returns to handover request ack message to source eNB.
Wherein, in handover request ack message, target eNB is carried to the confirmation of RACH less handover schemes 2, is entered One step, the ascending resource for distributing to UE can be carried, also, as source eNB and target eNB asynchronous, carry source eNB and mesh Mark the sub-frame boundary deviation between eNB.
If not having to carry the ascending resource for distributing to UE in handover request ack message, target eNB can also be by pre- Ascending resource is sent to UE by the mode of scheduling or dynamic dispatching.
Further, if target eNB is disagreed using RACH less handover schemes 2, i.e., do not send and confirm to source eNB Information, then source eNB can use other handover schemes, initiate handover request again.
Step 305：Source eNB sends switching command to UE, and instruction UE uses RACH less handover schemes 2, further, If carrying the ascending resource for distributing to UE and sub-frame boundary deviation in handover request ack message, target is carried simultaneously ENB distributes to the sub-frame boundary deviation between UE ascending resource and source eNB and target eNB.
Step 306：Terminal calculates target eNB TA values.
For example, it is specially：First, UE obtains the descending propagation time difference between cell-of-origin and Target cell, for example, T1- T2。
Then, the TA values based on source eNB, target eNB TA values are calculated (assuming that up (UL) propagation delay and descending (DL) Propagation delay is identical)：
1) as source eNB and target eNB synchronizations, TAtarget=TAsource-2(T1-T2)
Wherein, TAtargetRepresent target eNB TA values, TAsourceExpression source eNB TA values.
2) as source eNB and target eNB asynchronous, TAtarget=TAsource-2(T1-T2)+ΔT
Wherein, Δ T represents the sub-frame boundary deviation between source eNB and target eNB.
Step 307：Terminal judges whether to meet uplink synchronous requirement, if so, then performing step 308, otherwise, performs step 309。
For example, it is specially：Judge whether (T1-T2) is more than predetermined threshold value, for example, TH, if so, determining to be unsatisfactory for Row is synchronous to be required, otherwise, it determines meeting uplink synchronous requirement.
Wherein, predetermined threshold value TH, UE can be allocated to by RRC signaling, or be arranged in the protocol.
Certainly, how to judge whether to meet uplink synchronous requirement, can also use other methods, in the embodiment of the present invention It is not defined.
Step 308：TA values of the UE based on target eNB, in target eNB transmissions on the ascending resource of target eNB distribution Row signal, complete switching.
Step 309：UE initiates RACH flows, completes switching.
I.e. at this moment, RACH less handover schemes 2 are disabled that UE can not be completed based on RACH less handover schemes 2 Switching, then UE need to use other traditional handover schemes, such as by performing RACH flows, complete switching.
(3) application scenarios three：UE has double transmitting-receiving abilities and handover scheme is RACH less handover schemes 1+ Seamless handover schemes, and target eNB confirm that RACH less handover scheme 1+Seamless handover schemes are applicable (by using exemplified by RACH less handover schemes 1), referring particularly to shown in Fig. 6, in the embodiment of the present invention, reduces handover delay The implementation procedure of method is specific as follows：
Step 400：Source eNB sends the request of UE Capability queries to UE.
Step 401：UE reports UE ability informations to source eNB.
Wherein, in UE ability informations, instruction UE has double transmitting-receiving abilities.
Step 402：Source eNB sends handover request to target eNB.
Wherein, in handover request, instruction is wished to use RACH less handover scheme 1+Seamless handover schemes, and takes The time of upward signal is sent with UE.
Step 403：The upward signal that target eNB is sent in time measurement UE, and the upward signal sent based on UE, meter Calculate target eNB TA values.
Step 404：Target eNB returns to handover request ack message to source eNB.
Wherein, in handover request ack message, carry target eNB and RACH less handover schemes 1+Seamless is switched The confirmation and TA values of scheme, further, can carry the ascending resource for distributing to UE.
If not having to carry the ascending resource for distributing to UE in handover request ack message, target eNB can also be by pre- Ascending resource is sent to UE by the mode of scheduling or dynamic dispatching.
Step 405：Source eNB sends switching command to UE, and instruction UE is cut using RACH less handover schemes 1+Seamless Scheme is changed, and carries TA values, further, if carrying the ascending resource for distributing to UE in handover request ack message, together When carry target eNB and distribute to UE ascending resource.
Step 406：UE is based on above-mentioned TA values, and up letter is sent to target eNB on the ascending resource of target eNB distribution Number, complete switching.
(4) application scenarios four：UE has double transmitting-receiving abilities and handover scheme is RACH less handover schemes 2+ Seamless handover schemes, and target eNB confirm that RACH less handover schemes 2 are inapplicable, and Seamless handover schemes are suitable , referring particularly to shown in Fig. 7, in the embodiment of the present invention, the implementation procedure for reducing the method for handover delay is specific as follows：
Step 500：Source eNB sends the request of UE Capability queries to UE.
Step 501：UE reports UE ability informations to source eNB.
Wherein, in UE ability informations, instruction UE has double transmitting-receiving abilities.
Step 502：Source eNB sends handover request to target eNB.
Wherein, in handover request, instruction is wished to use RACH less handover scheme 2+Seamless handover schemes, may , carry cell-of-origin radius information corresponding to the eNB of source.
Step 503：If target eNB receives cell-of-origin radius information, based on cell-of-origin radius and Target cell radius Comparing result determine whether to use RACH less schemes 2, for example, determining that RACHless schemes 2 are inapplicable.
Wherein, the implementation procedure of step 503 and above-mentioned steps 303 is identical.
Step 504：Target eNB returns to handover request ack message to source eNB.
Wherein, in handover request ack message, target eNB is carried to the confirmation of Seamless handover schemes and right The refusal information of RACH less handover schemes 2, and the PRACH information that target eNB distributes to UE may be carried.
Step 505：Source eNB sends switching command to UE, and instruction UE uses Seamless handover schemes, and may carry mesh Mark eNB distributes to UE PRACH information.
Step 506：UE initiates RACH flows to target eNB.
(5) application scenarios five：Relatively with application scenarios one, it is RACH that UE, which does not have double transmitting-receiving abilities and handover scheme, Less handover schemes 1, and target eNB confirm that RACH less handover schemes 1 are disabled, then source eNB can use RACH Less handover schemes 2 send handover request to target eNB again, and implementation procedure and application scenarios two afterwards is identical, here No longer carry out repeating.
Or source eNB directly indicates that UE is switched over using other traditional handover schemes of the prior art, wherein, pass The implementation procedure of the handover scheme of system, existing method can be used, here with regard to no longer carrying out repeating.Here tradition switching Scheme, refer to remove RACH less handover schemes 1, the and of RACH less handover schemes 2 mentioned in the embodiment of the present invention Other handover schemes outside Seamless handover schemes.
(6) application scenarios six：Relatively with application scenarios two, it is RACH that UE, which does not have double transmitting-receiving abilities and handover scheme, Less handover schemes 2, and target eNB confirm that RACH less handover schemes 2 are disabled, then source eNB can use RACH Less handover schemes 1 send handover request to target eNB again, and implementation procedure and application scenarios one afterwards is identical, here No longer carry out repeating.
Or source eNB directly indicates that UE is switched over using other traditional handover schemes of the prior art.
(7) application scenarios seven：Relatively with application scenarios three, UE has double transmitting-receiving abilities and handover scheme is RACH less Handover scheme 1+Seamless handover schemes, and target eNB confirm RACH less handover scheme 1+Seamless handover schemes It is applicable (by using exemplified by Seamless handover schemes), or confirms that RACH less handover schemes 1 are inapplicable, and Seamless handover schemes are applicable, at this moment, are switched over using Seamless handover schemes, specific implementation procedure It is similar with application scenarios four, the handover scheme information simply carried in handover request ack message and switching command is not With.
(8) application scenarios eight：Relatively with application scenarios four, UE has double transmitting-receiving abilities and handover scheme is RACH less Handover scheme 2+Seamless handover schemes, and target eNB confirm RACH less handover scheme 2+Seamless handover schemes It is applicable.
Implementation procedure is similar with application scenarios two, unlike, handover request ack message and source that target eNB is returned ENB is sent in UE switching command, adds confirmation and PRACH resources to Seamless handover schemes.
Also, it is different corresponding to the process of step 309, it is changed to：UE uses Seamless handover schemes, completes switching. With regard to saying, as target eNB while it is determined that RACH less handover scheme 2+Seamless handover schemes are applicable, also, works as When UE judges that RACH less handover schemes 2 do not apply to, UE can be switched over directly using Seamless handover schemes again.
(9) application scenarios nine：UE has double transmitting-receiving abilities and handover scheme is Seamless handover schemes, and target ENB confirms that Seamless handover schemes are applicable.Implementation procedure and application scenarios four are similar, unlike, not to RACH The judgement of less handover schemes 2 (does not include step 503), in handover request and handover request ack message, all without carrying The radius information of cell-of-origin corresponding to RACH less handover schemes 2 and source eNB.
What deserves to be explained is when UE has double transmitting-receiving abilities, the handover scheme that source eNB is determined can also only be RACH Less handover schemes 1,2 one kind therein of RACH less handover schemes, implementation procedure and application scenarios one, application scenarios two-phase Together.
Other possible application scenarios, in the embodiment of the present invention, it will not enumerate, those skilled in the art can To be unambiguously inferred to based on above-mentioned application scenarios, also belong in scope of protection of the present invention.
Based on above-described embodiment, as shown in fig.8, in the embodiment of the present invention, the device of handover delay is reduced, specific bag Include：
Receiving unit 60, the UE ability informations reported for receiving UE；
Processing unit 61, for according to the UE ability informations received, determining handover scheme, and be based on the switching side Case, handover request is sent to target eNB, wherein, the handover scheme is at least carried in handover request；
Indicating member 62, the handover request ack message returned for receiving target eNB based on the handover request, if really When target eNB is carried in the fixed handover request ack message to the confirmation of the handover scheme, instruction UE uses institute Handover scheme is stated, completes switching.
Preferably, when receiving the UE ability informations that UE is reported, receiving unit 60 is specifically used for：
The UE abilities that UE asks the response message returned to report by the UE Capability queries sent based on source eNB are received to believe Breath；Or,
Receive the UE ability informations that UE establishes information reporting by RRC connections.
Preferably, according to the UE ability informations received, when determining handover scheme, processing unit 61 is specifically used for：
If according to UE ability informations, determine that UE has double transmitting-receiving abilities, then the handover scheme that source eNB is determined is following one kind Or any combination：RACH less handover schemes 1, RACH less handover schemes 2 and Seamless handover schemes；Or,
If according to UE ability informations, determine that UE does not have double transmitting-receiving abilities, then the handover scheme that source eNB is determined is with next Kind or any combination：RACH less handover schemes 1, RACH less handover schemes 2.
Preferably, the target eNB is target eNB to the confirmation of the handover scheme according to current network environment It is determined.
Preferably, further comprise：
If it is determined that handover scheme be RACH less handover schemes 1, then at least carried in the handover request UE transmission The time of upward signal, and in the handover request ack message, target eNB the first TA values are at least carried, wherein, institute Stating target eNB the first TA values is, target eNB sends the time of upward signal based on the UE received, according to preset algorithm meter Obtain；Or,
If it is determined that handover scheme be RACH less handover schemes 2, then when source eNB and target eNB are asynchronous, In the handover request ack message, source eNB and target eNB sub-frame boundary deviation is at least carried；Or,
If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, then the handover request In at least carry the time that UE sends upward signal, and in the handover request ack message, at least carry target eNB The first TA values；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, then the handover request In response message, at least when source eNB and target eNB are asynchronous, source eNB and target eNB sub-frame boundary deviation is carried.
Preferably, instruction UE uses the handover scheme, when completing switching, indicating member 62 is specifically used for：
If it is determined that handover scheme be RACH less handover schemes 1, it indicates that UE is entered using RACH less handover schemes 1 Row switching, and target eNB the first TA values are sent to UE, first TA values of the UE based on the target eNB is made, in target eNB Distribute to and upward signal is sent on UE ascending resource；Or,
If it is determined that handover scheme be RACH less handover schemes 2, it indicates that UE is entered using RACH less handover schemes 2 Row switching, and when it is determined that UE judge source eNB and target eNB meet uplink synchronous requirement when, make UE based on target eNB second TA values, distributed in target eNB and upward signal is sent on UE ascending resource；Wherein, the 2nd TA values of the target eNB, it is The UE is calculated according to the source eNB and target eNB of measurement downstream signal；Or,
If it is determined that handover scheme be Seamless handover schemes, it indicates that UE is cut using Seamless handover schemes Change, make the UE initiate RACH flows to target eNB；Or,
If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, it indicates that UE use RACH less handover scheme 1+Seamless handover schemes switch over, and by target eNB the first TA values, make UE be based on institute Target eNB the first TA values are stated, is distributed in target eNB and upward signal is sent on UE ascending resource；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE use RACH less handover scheme 2+Seamless handover schemes switch over, and will be as source eNB and target eNB asynchronous, source ENB and target eNB sub-frame boundary deviation is sent to the UE, and when determination UE is judged in source eNB and target eNB satisfactions Row makes twoth TA values of the UE based on target eNB when synchronously requiring, target eNB distribute to sent on UE ascending resource it is up Signal；Or,
If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE use RACH less handover scheme 2+Seamless handover schemes switch over, and will be as source eNB and target eNB asynchronous, source ENB and target eNB sub-frame boundary deviation is sent to the UE, and when determination UE judges that source eNB and target eNB is unsatisfactory for During uplink synchronous requirement, UE is made to initiate RACH flows to target eNB.
Preferably, the target eNB distributes to UE ascending resource, it is that target eNB is sent to the UE by source eNB 's；Or,
The target eNB distributes to UE ascending resource, is that target eNB is sent to institute by way of default pre-scheduling State UE's；Or,
The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of dynamic dispatching 's.
In summary, in the embodiment of the present invention, source eNB receives the UE ability informations that UE is reported；Source eNB is according to receiving UE ability informations, handover scheme is determined, and be based on above-mentioned handover scheme, handover request is sent to target eNB, wherein, switching please Above-mentioned handover scheme is at least carried in asking；Source eNB receives the switching request response that target eNB is returned based on above-mentioned handover request Message, however, it is determined that when target eNB is carried in above-mentioned handover request ack message to the confirmation of above-mentioned handover scheme, instruction UE uses above-mentioned handover scheme, completes switching, so, according to UE ability informations and current network environment, i.e., different applications Scene, source eNB and target eNB consult to determine handover scheme, neatly determine suitable low time delay, low service disconnection for UE The handover scheme of time.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without departing from this hair to the embodiment of the present invention The spirit and scope of bright embodiment.So, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention And its within the scope of equivalent technologies, then the present invention is also intended to comprising including these changes and modification.

Claims (14)

  1. A kind of 1. method for reducing handover delay, it is characterised in that including：
    The UE ability informations that source evolved base station eNB receiving terminals UE is reported；
    Source eNB determines handover scheme according to the UE ability informations received, and is based on the handover scheme, is sent to target eNB Handover request, wherein, the handover scheme is at least carried in handover request；
    Source eNB receives the handover request ack message that target eNB is returned based on the handover request, however, it is determined that the handover request When target eNB is carried in response message to the confirmation of the handover scheme, instruction UE use the handover scheme, completion Switching.
  2. 2. the method as described in claim 1, it is characterised in that source eNB receives the UE ability informations that UE is reported, and specifically includes：
    Source eNB, which receives the UE abilities that UE asks the response message returned to report by the UE Capability queries sent based on source eNB, to be believed Breath；Or,
    Source eNB receives the UE ability informations that UE establishes information reporting by radio resource control RRC connection.
  3. 3. the method as described in claim 1, it is characterised in that source eNB is according to the UE ability informations received, it is determined that switching side Case, specifically include：
    If according to UE ability informations, determine that UE has double transmitting-receiving abilities, then the handover scheme that source eNB is determined is following one kind or appoints Meaning combination：Switch without random access procedure RACH less handover schemes 1, RACH less handover schemes 2 and seamless Seamless Scheme；Or,
    If according to UE ability informations, determine that UE does not have double transmitting-receiving abilities, then the handover scheme that source eNB is determined to be following a kind of or Any combination：RACH less handover schemes 1, RACH less handover schemes 2.
  4. 4. the method as described in claim 1,2 or 3, it is characterised in that confirmation letters of the target eNB to the handover scheme Breath is that target eNB is determined according to current network environment.
  5. 5. method as claimed in claim 4, it is characterised in that further comprise：
    If it is determined that handover scheme be RACH less handover schemes 1, then at least carried in the handover request UE send it is up The time of signal, and in the handover request ack message, target eNB very first time lead TA value is at least carried, Wherein, the first TA values of the target eNB are that target eNB sends the time of upward signal based on the UE received, according to default What algorithm was calculated；Or,
    If it is determined that handover scheme be RACH less handover schemes 2, then it is described when source eNB and target eNB are asynchronous In handover request ack message, source eNB and target eNB sub-frame boundary deviation is at least carried；Or,
    If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, then in the handover request extremely The time that UE sends upward signal is carried less, and in the handover request ack message, at least carries the of target eNB One TA values；Or,
    If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, then the switching request response In message, at least when source eNB and target eNB are asynchronous, source eNB and target eNB sub-frame boundary deviation is carried.
  6. 6. method as claimed in claim 5, it is characterised in that instruction UE uses the handover scheme, completes switching, specific bag Include：
    If it is determined that handover scheme be RACH less handover schemes 1, it indicates that UE is cut using RACH less handover schemes 1 Change, and target eNB the first TA values are sent to UE, make first TA values of the UE based on the target eNB, distributed in target eNB To sending upward signal on UE ascending resource；Or,
    If it is determined that handover scheme be RACH less handover schemes 2, it indicates that UE is cut using RACH less handover schemes 2 Change, and when it is determined that UE judges that source eNB and target eNB meets uplink synchronous requirement, make twoth TAs of the UE based on target eNB Value, distributes in target eNB and upward signal is sent on UE ascending resource；Wherein, the 2nd TA values of the target eNB, it is institute Downstream signals of the UE according to the source eNB and target eNB of measurement is stated, is calculated；Or,
    If it is determined that handover scheme be Seamless handover schemes, it indicates that UE is switched over using Seamless handover schemes, The UE is made to initiate RACH flows to target eNB；Or,
    If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, it indicates that UE uses RACH Less handover scheme 1+Seamless handover schemes are switched over, and target eNB the first TA values are sent into UE, make UE be based on The first TA values of the target eNB, distribute in target eNB and upward signal are sent on UE ascending resource；Or,
    If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE uses RACH Less handover scheme 2+Seamless handover schemes switch over, and will as source eNB and target eNB asynchronous, source eNB and Target eNB sub-frame boundary deviation is sent to the UE, and when determining that it is up same that UE judges that source eNB and target eNB meets When step requires, twoth TA values of the UE based on target eNB is made, is distributed in target eNB and upward signal is sent on UE ascending resource； Or,
    If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE uses RACH Less handover scheme 2+Seamless handover schemes switch over, and will as source eNB and target eNB asynchronous, source eNB and Target eNB sub-frame boundary deviation is sent to the UE, and when determining that it is up that UE judges that source eNB and target eNB is unsatisfactory for When synchronously requiring, UE is made to initiate RACH flows to target eNB.
  7. 7. method as claimed in claim 6, it is characterised in that the target eNB distributes to UE ascending resource, is target ENB is sent to the UE's by source eNB；Or,
    The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of default pre-scheduling 's；Or,
    The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of dynamic dispatching.
  8. A kind of 8. device for reducing handover delay, it is characterised in that including：
    Receiving unit, the UE ability informations reported for receiving terminal UE；
    Processing unit, the UE ability informations received for basis, determines handover scheme, and is based on the handover scheme, to mesh Mark eNB and send handover request, wherein, the handover scheme is at least carried in handover request；
    Indicating member, the handover request ack message returned for receiving target eNB based on the handover request, however, it is determined that described When target eNB is carried in handover request ack message to the confirmation of the handover scheme, instruction UE uses the switching Scheme, complete switching.
  9. 9. device as claimed in claim 8, it is characterised in that when receiving the UE ability informations that UE is reported, receiving unit is specific For：
    Receive the UE ability informations that UE asks the response message returned to report by the UE Capability queries sent based on source eNB；Or,
    Receive the UE ability informations that UE establishes information reporting by radio resource control RRC connection.
  10. 10. device as claimed in claim 8, it is characterised in that according to the UE ability informations received, determine handover scheme When, processing unit is specifically used for：
    If according to UE ability informations, determine that UE has double transmitting-receiving abilities, then the handover scheme that source eNB is determined is following one kind or appoints Meaning combination：Switch without random access procedure RACH less handover schemes 1, RACH less handover schemes 2 and seamless Seamless Scheme；Or,
    If according to UE ability informations, determine that UE does not have double transmitting-receiving abilities, then the handover scheme that source eNB is determined to be following a kind of or Any combination：RACH less handover schemes 1, RACH less handover schemes 2.
  11. 11. the device as described in claim 8,9 or 10, it is characterised in that confirmations of the target eNB to the handover scheme Information is that target eNB is determined according to current network environment.
  12. 12. device as claimed in claim 11, it is characterised in that further comprise：
    If it is determined that handover scheme be RACH less handover schemes 1, then at least carried in the handover request UE send it is up The time of signal, and in the handover request ack message, target eNB very first time lead TA value is at least carried, Wherein, the first TA values of the target eNB are that target eNB sends the time of upward signal based on the UE received, according to default What algorithm was calculated；Or,
    If it is determined that handover scheme be RACH less handover schemes 2, then it is described when source eNB and target eNB are asynchronous In handover request ack message, source eNB and target eNB sub-frame boundary deviation is at least carried；Or,
    If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, then in the handover request extremely The time that UE sends upward signal is carried less, and in the handover request ack message, at least carries the of target eNB One TA values；Or,
    If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, then the switching request response In message, at least when source eNB and target eNB are asynchronous, source eNB and target eNB sub-frame boundary deviation is carried.
  13. 13. device as claimed in claim 12, it is characterised in that instruction UE uses the handover scheme, when completing switching, refers to Show that unit is specifically used for：
    If it is determined that handover scheme be RACH less handover schemes 1, it indicates that UE is cut using RACH less handover schemes 1 Change, and target eNB the first TA values are sent to UE, make first TA values of the UE based on the target eNB, distributed in target eNB To sending upward signal on UE ascending resource；Or,
    If it is determined that handover scheme be RACH less handover schemes 2, it indicates that UE is cut using RACH less handover schemes 2 Change, and when it is determined that UE judges that source eNB and target eNB meets uplink synchronous requirement, make twoth TAs of the UE based on target eNB Value, distributes in target eNB and upward signal is sent on UE ascending resource；Wherein, the 2nd TA values of the target eNB, it is institute Downstream signals of the UE according to the source eNB and target eNB of measurement is stated, is calculated；Or,
    If it is determined that handover scheme be Seamless handover schemes, it indicates that UE is switched over using Seamless handover schemes, The UE is made to initiate RACH flows to target eNB；Or,
    If it is determined that handover scheme be RACH less handover scheme 1+Seamless handover schemes, it indicates that UE uses RACH Less handover scheme 1+Seamless handover schemes are switched over, and target eNB the first TA values are sent into UE, make UE be based on The first TA values of the target eNB, distribute in target eNB and upward signal are sent on UE ascending resource；Or,
    If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE uses RACH Less handover scheme 2+Seamless handover schemes switch over, and will as source eNB and target eNB asynchronous, source eNB and Target eNB sub-frame boundary deviation is sent to the UE, and when determining that it is up same that UE judges that source eNB and target eNB meets When step requires, twoth TA values of the UE based on target eNB is made, is distributed in target eNB and upward signal is sent on UE ascending resource； Or,
    If it is determined that handover scheme be RACH less handover scheme 2+Seamless handover schemes, it indicates that UE uses RACH Less handover scheme 2+Seamless handover schemes switch over, and will as source eNB and target eNB asynchronous, source eNB and Target eNB sub-frame boundary deviation is sent to the UE, and when determining that it is up that UE judges that source eNB and target eNB is unsatisfactory for When synchronously requiring, UE is made to initiate RACH flows to target eNB.
  14. 14. device as claimed in claim 13, it is characterised in that the target eNB distributes to UE ascending resource, is target ENB is sent to the UE's by source eNB；Or,
    The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of default pre-scheduling 's；Or,
    The target eNB distributes to UE ascending resource, is that target eNB is sent to the UE by way of dynamic dispatching.
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