CN104994551A - Configuration switching method of LTE (Long Term Evolution) system under high-speed mobile context - Google Patents
Configuration switching method of LTE (Long Term Evolution) system under high-speed mobile context Download PDFInfo
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- CN104994551A CN104994551A CN201510409700.0A CN201510409700A CN104994551A CN 104994551 A CN104994551 A CN 104994551A CN 201510409700 A CN201510409700 A CN 201510409700A CN 104994551 A CN104994551 A CN 104994551A
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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
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
Abstract
The invention discloses a configuration switching method of an LTE (Long Term Evolution) system under a high-speed mobile context. The method comprises the following steps that a physical layer of a source base station carries out Doppler frequency offset estimation, carries out statistics and sampling on a Doppler frequency offset value, and reports to a high level before a user terminal measurement report is received; a terminal sends a measurement report message to the source base station; after the source base station receives the user terminal measurement report, the source base station carries out a switching judgment, if switching is allowed, the source base station synchronously initiates a switching request and carries the Doppler frequency offset value; after a target subject receives the switching request, the target subject audits resources, if switching is allowed, the target subject synchronously carries out local configuration, analyzes the Doppler frequency offset value and configures to the physical layer; and after the target subject completes configuration, the target subject replies a switching request response message. According to the method, the condition of failed switching of a target cell, which is caused by carrying out frequency offset estimation again, can be avoided, and the switching success rate is improved. In addition, the additional time caused by difficulty in random access due to poor channel quality of the target cell can be reduced, and the switching delay is reduced.
Description
Technical field
The present invention relates to wireless communication technology field, specifically under a kind of high-speed mobile scene, improve the handover configurations method of LTE system handover success rate.
Background technology
LTE(Long Term Evolution) in system, handoff technique is for ensureing that user can obtain good service quality.Therefore handover success rate is an important indicator in LTE system.Under high-speed mobile scene, the channel circumstance of LTE system is comparatively complicated, and the doppler shift effect caused by relative motion between terminal and base station is especially obvious.As shown in Figure 1, Base Transmitter frequency, terminal receive frequency, base station receive frequency are respectively F1, F2, F3, Doppler frequency shift causes terminal UE Received signal strength and base station eNodeB to send an existence frequency departure between signal, this deviation can cause UE to receive data symbol and occur phase rotating, and then has influence on the accuracy of data demodulates.The existence of Doppler shift reduces the success rate of user's Stochastic accessing, increases handoff failure risk, compromises the communication quality of LTE system under High-speed Circumstance greatly.
Success rate in order to switch under improving High-speed Circumstance in prior art is generally realized by parameter optimization, and the maximum retransmission of such as, message m sg3 when increasing Stochastic accessing, reduces the methods such as switch decision thresholding.Although these class methods can improve the success rate of switching to a certain extent, often sacrifice system performance on the other hand, as improve the number of times of Signalling exchange, adding handover delay, have impact on the communication quality of user to a certain extent.
Summary of the invention
For the deficiencies in the prior art, the present invention is at existing protocol (TS36.331, TS36.413, TS36.423), on basis, the handover configurations method of LTE system under a kind of high-speed mobile scene is provided, to improve handover success rate, and reduce time delay, improve communication quality.
Technical solution of the present invention provides the handover configurations method of LTE system under a kind of high-speed mobile scene, comprises the following steps:
Step one, receive user terminal measurement report before, the physical layer of source base station carries out Doppler shift estimation, adds up and samples, and be reported to high level to Doppler shift value;
Step 2, terminal send Measurement Reports message to source base station, and described Measurement Reports message is for measuring reporting message;
Step 3, source base station carry out switch decision after receiving user terminal measurement report, if allow to switch, then initiate handover request, carry step one gained Doppler shift value in the corresponding message of handover request simultaneously; The corresponding message of handover request is determined as follows according to switching type,
Switching for X2, is initiate Handover Request message to object base station, and described Handover Request message is that X2 switches message;
Switch for S1, be initiate Handover Required message to core net, described Handover Required message is that S1 switches message;
Switching in station, is switch request message in the L2 MAC initiator of object community;
Step 4, object main body carry out resource examination & verification after receiving handover request, if allow to switch, carry out this locality configuration, parse the Doppler shift value in handover request simultaneously and configure to physical layer;
Step 5, object main body reply Handover Request Acknowledge message after completing configuration, described Handover Request Acknowledge message is handoff request acknowledgment message;
Switching for X2, is reply handoff request acknowledgment message to source base station;
Switching for S1, is reply handoff request acknowledgment message to core net;
Switching in station, is reply handoff request acknowledgment message to the L3 RRM/CC module of object community.
And carry Doppler shift value in this switching message, implementation is utilize spare field in the corresponding message of handover request to preserve Doppler shift value.
And, when carrying out normal subsequent operation after step 5, doppler bias value is used for the valuation of object base station physical layer about up channel frequency deviation with configuration.
And, X2 is switched, after step 5, carries out normal subsequent operation as follows,
After source base station receives handoff request acknowledgment message, issue RRC Connection Reconfiguration message to user terminal, make user terminal initiate Stochastic accessing to object base station; Described RRC Connection Reconfiguration message is wireless resource control connection reconfiguration message;
Source base station sends SN Status Transfer message to object base station, described SN Status Transfer is SN state transfer message, and SN is the sequence number of data;
When user terminal switches toward Target cell, re-start synchronous and Stochastic accessing, Target cell directly uses the Doppler shift value of cell-of-origin to carry out demodulation to the upward signal of terminal.
And whether carry rach-Config Dedicated field according to base station in reconfiguration message, user terminal is divided into non-competing with competition two type when initiating Stochastic accessing,
Competition Stochastic accessing comprises following sub-step,
Steps A 1, terminal initiate random access preamble message to object base station, carry the preamble index this time accessing and use; Described random access preamble message is random access preamble message;
Steps A 2, object base station return random access response message to terminal, wherein carry TA Command, UL Grant and interim RNTI; Described random access response message is accidental access response message, and TA Command is time advance commands, and UL Grant is uplink authorization, and RNTI is Radio Network Temporary Identifier;
Steps A 3, terminal send C-RNTI MAC Control Element message on the running time-frequency resource of uplink authorization, the C_RNTI of carried terminal oneself; Described C-RNTI MAC Control Element message is first time scheduled transmission message, and C_RNTI is Cell Radio Network Temporary Identifier/Identity, Cell-RNTI;
Steps A 4, object base station adopt C_RNTI to carry out Conflict solving, return DCI 0 with C-RNTI for RRC Connection Reconfiguration Complete message to terminal; Described DCI 0 with C-RNTI for RRC Connection Reconfiguration Complete is contention resolved message;
Steps A 5, terminal send RRC Connection Reconfiguration Complete message to object base station, Stochastic accessing completes; RRC Connection Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message;
Non-competing Stochastic accessing comprises following sub-step,
Step B1, terminal initiate random access preamble to object base station, carry the preamble index this time accessing and use; Described random access preamble message is random access preamble message;
Step B2, object base station return random access response message to terminal, wherein carry TA Command, UL Grant and interim RNTI; Described random access response message is accidental access response message, and TA Command is time advance commands, and UL Grant is uplink authorization, and RNTI is Radio Network Temporary Identifier;
Step B3, terminal send RRC Connection Reconfiguration Complete message to object base station, Stochastic accessing completes, and RRC Connection Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message.
The present invention is when receiving UE measurement report and determining to initiate to switch when base station side, in handover request, carry Doppler shift value send, when UE to switch toward Target cell and initiates Stochastic accessing, Target cell can directly use the frequency deviation value of cell-of-origin to complete switching.Method provided by the invention can avoid Target cell to cause the situation of handoff failure because re-starting frequency deviation estimation, does not need the msg3 repeatedly processing Stochastic accessing, improves handover success rate.In addition, also can reduce Target cell because Doppler shift estimate and the time of ancillary cost, complete Stochastic accessing in the shorter time, under identical parameter configuration, (number of retransmissions as msg3) reduces handover delay.
Accompanying drawing explanation
Fig. 1 is the Doppler shift schematic diagram under prior art high speed scene.
Fig. 2 competes the schematic flow sheet of Stochastic accessing when being and switching in the embodiment of the present invention.
Fig. 3 is the schematic flow sheet of non-competing Stochastic accessing when switching in the embodiment of the present invention.
The X2 changing method schematic flow sheet that Fig. 4 provides for the embodiment of the present invention.
Embodiment
The present invention proposes, the Doppler shift that UE under high-speed mobile scene produces can be carried out sampling by physical layer and be added up, draw an estimated value and report high level, source base station utilizes this estimated value through hand off signaling notification target base station, save the frequency deviation estimated time of object base station, improve handover success rate.In order to better set forth technical scheme of the present invention, below in conjunction with drawings and Examples, thought of the present invention is further described.
During concrete enforcement, the present invention can adopt software engineering realization flow automatically to run.The embodiment of the present invention is supplemented switching message on the basis of S1/X2 agreement, the Doppler shift information of user is attached in handover request message.
Improve the method for LTE system handover success rate under a kind of high-speed mobile scene that embodiment provides, comprise the following steps:
Step one, source base station are before receiving user terminal measurement report, and carry out Doppler shift estimation in physical layer, can carry out adds up and sample obtains Doppler shift value, and is reported to high level.Can Doppler shift estimation be carried out before the message of the i.e. physical layer of source base station RRC Connection Request of reporting base station when ue initially accesses, Doppler shift value added up and samples, and being reported to protocol stack L3.Described protocol stack L3 and protocol stack chain of command Layer3, is responsible for initiating to switch.
Step 2, terminal send Measurement Reports message to source base station, and Measurement Reports message is for measuring reporting message.
Step 3, source base station carry out switch decision after receiving user terminal measurement report, if allow to switch, then initiate handover request:
The switching mode that three kinds different is had during concrete enforcement, the corresponding message of handover request is determined according to switching type: source base station carries out switch decision after receiving user terminal measurement report, if allow to switch, then initiate Handover Request(X2 to switch to object base station) message, or initiate Handover Required(S1 to core net to switch) message (the Handover Request that the Doppler frequency shift that when noticing that S1 switches, target BS receives is sent out from core net, this request message transparent transmission source base station issues the frequency shift value carried in the Handover Required of core net), or in the L2 MAC initiator of object community (in eNB other communities), switch request message (switching in standing).Carry step one gained Doppler shift value within the message simultaneously; This value can utilize the spare field switched in message to preserve, and can use like this when not changing agreement.Wherein, the media in L2 MAC presentation protocol stack data surface Layer2 get involved key-course (media access control); Spare represents extendible redundancy.
(X2 switches and S1 switching is object base station for step 4, object main body, switch to object community in standing) receive handover request after carry out resource examination & verification, if allow to switch, carry out this locality configuration, mainly bottom and forwarding tunnel are configured, parse the Doppler shift value in handover request, and configuration is to physical layer simultaneously.
(X2 switches and S1 switching is object base station for step 5, object main body, object community is switched in standing) complete the backward source base station of configuration (X2), core net (S1) or L3 RRM/CC module (switching in standing) reply Handover Request Acknowledge message, Handover Request Acknowledge message is handoff request acknowledgment message.Wherein, RRM is radio resource management module; CC is chain of command nucleus module.
Wherein, the switching flow emphasis that step one, three, four is the present invention's improvement, subsequent operation can be deferred to respective standard agreement flow process and be carried out, the doppler bias value increased can be used in the valuation of object base station physical layer about up channel frequency deviation with configuration, thus the expense of signaling and time delay in Stochastic accessing step after decreasing terminal switch.For X2 switching flow, after step 5, carry out following operation:
(1) after source base station receives handover acknowledge (i.e. handoff request acknowledgment message), issue RRC Connection Reconfiguration message to user terminal, make user terminal initiate Stochastic accessing to object base station.RRC Connection Reconfiguration message is wireless resource control connection reconfiguration message.
(2) source base station sends SN Status Transfer message to object base station.Wherein SN Status Transfer is SN state transfer message, and in order to inform the uplink receiving state of object base station PDCP SN and descending transmission state, SN is the sequence number (sequence number) of data.
(3) when user terminal switches toward Target cell, need to re-start synchronous and Stochastic accessing, now Target cell can directly use the frequency deviation value of cell-of-origin to carry out demodulation to the upward signal of terminal, decrease the time that frequency deviation is estimated to spend, improve the success rate of Stochastic accessing, also just improve the success rate of switching accordingly.Other switching types are similar, and the physical layer of target BS carrys out according to frequency deviation the upward signal that demodulation terminal sends.
And whether step (3) carries rach-Config Dedicated field according to source base station in reconfiguration message, user terminal is divided into non-competing with competition two type when initiating Stochastic accessing, wherein rach-Config Dedicated represents that proprietary Stochastic accessing configures;
In reconfiguration message, do not carry rach-Config Dedicated field, then user terminal initiates competition Stochastic accessing, and competition Stochastic accessing comprises following sub-step:
Steps A 1, terminal initiate random access preamble(msg1 to object base station) message, carry the preamble index this time accessing and use.
Steps A 2, object base station return random access response(RAR to terminal) message, wherein carry TA Command, UL Grant(uplink authorization) and interim RNTI.
Steps A 3, terminal send msg3 on the running time-frequency resource of uplink authorization, the C_RNTI of carried terminal oneself.
Steps A 4, object base station adopt C_RNTI to carry out Conflict solving, return contention resolved result (msg4) to terminal.
Steps A 5, terminal send RRC Connection Reconfiguration Complete to object base station, Stochastic accessing completes.RRC Connectionp Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message.
In reconfiguration message, carry rach-Config Dedicated field, then user terminal initiates non-competing Stochastic accessing, and non-competing random access procedure is relatively simple, comprises following sub-step:
Step B1, terminal initiate random access preamble(msg1 to object base station) message, carry the preamble index this time accessing and use.
Step B2, object base station return random access response(RAR to terminal) message, wherein carry TA Command, UL Grant(uplink authorization) and interim RNTI.
Step B3, terminal send RRC Connection Reconfiguration Complete to object base station, Stochastic accessing completes.RRC Connectionp Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message.
As shown in Figure 4, user terminal is designated as UE, source base station is designated as Source eNb, object base station is designated as Target eNb, MME is Mobility Management Entity, and Serving Gateway is IAD (if switch in station, in eNb, cell-of-origin is designated as Source cell, and object community is designated as Target cell), for the sake of ease of implementation, the embodiment of the present invention provides the concrete implementation step of complete X2 switching flow as follows:
Step 1, Source eNb are before receiving UE measurement report, and physical layer carries out Doppler shift estimation, add up and sample, and be reported to high level to frequency deviation value, as " 0 Doppler shift estimates statistic sampling " in Fig. 4;
Step 2, UE send Measurement Reports message to Source eNb, and Measurement Reports is measurement reporting message, as " 1 Measurement Reports " in Fig. 4;
Step 3, Source eNb carry out switch decision after receiving UE measurement report, as " 2 HO decision " in Fig. 4, if allow to switch, then send Handover Request message to object base station, Handover Request message is X2 handover request message, in this message, carry Doppler shift value, as " 3 Handover Request+Doppler shift value " in Fig. 4 simultaneously.Spare field in this value Handover Request message is preserved, and can use like this when not changing agreement.
Also may switch for S1 or switch in station during concrete enforcement, source base station carries out switch decision after receiving UE measurement report, if allow to switch, then initiate Handover Request(X2 according to concrete switching type to Target eNb to switch) message, or initiate Handover Required(S1 to MME to switch) message, or initiate handover request message (switching in standing) to the L2 MAC of Target cell in eNb.Carry Doppler shift value within the message simultaneously; This value can utilize the spare field in message to preserve, and can use like this when not changing agreement.
Step 4, Target eNb(station in switch time be Target cell) receive handover request after carry out the judgement of local resource access, if allow to switch, carry out this locality configuration, comprise L2/L1/gtpu configuration, namely to bottom as L2(data link layer), L1(physical layer) and gtpu (forwarding tunnel) be configured; Parse Doppler shift value simultaneously, and configured to physical layer.As " 4 local resource accesses, L2/L1/gtpu configuration, the configuration of Doppler shift value " in Fig. 4.
Step 5, Target eNb(switch to Target cell in station) to complete when the backward Source eNb(S1 of configuration switches be MME, stand in switching time be the L3 RRM/CC module of Source cell) reply Handover Request Acknowledge message (see " 5 Handover Request Ack " in Fig. 4), Handover Request Acknowledge message is handoff request acknowledgment message.
Issue RRC Connection Reconfiguration message to UE after step 6, Source eNb receive handover acknowledge, make UE initiate Stochastic accessing, as " 6 RRC Connection Reconfiguration " in Fig. 4 to Target eNb.RRC Connection Reconfiguration message is wireless resource control connection reconfiguration message.
Step 7, Source eNb send SN Status Transfer message to Target eNb.Wherein SN Status Transfer is SN state transfer message, in order to inform the uplink receiving state of Target eNb PDCP SN and descending transmission state, SN is the sequence number (sequence number) of data, as " 7 SN Status Transfer " in Fig. 4.
Step 8, when UE switches toward Target cell, need to re-start synchronous and Stochastic accessing, as " 8 random access procedure " in Fig. 4.Now Target cell can directly use the frequency deviation value of cell-of-origin to carry out demodulation to the upward signal of terminal, decreases the time that frequency deviation is estimated to spend, improves the success rate of Stochastic accessing, also just improve the success rate of switching accordingly.
And whether carry rach-Config Dedicated field according to eNB in reconfiguration message in step 8, UE is divided into non-competing with competition two type when initiating Stochastic accessing..
As shown in Figure 2, compete Stochastic accessing and comprise following sub-step:
Steps A 1, terminal initiate random access preamble(msg1 to object base station) message, carry the preamble index this time accessing and use, as " 1 random access preamble " in Fig. 2.Wherein, random access preamble message is random access preamble message, and this area is accustomed to referred to as msg1 message, for sending Preamble code.
Steps A 2, object base station return random access response(RAR to terminal) message, wherein carry TA Command, UL Grant(uplink authorization) and interim RNTI, as " 2 random access response " in Fig. 2.Wherein, random access response message is accidental access response message, and this area custom is referred to as RAR message, and TA Command is time advance commands, and RNTI is Radio Network Temporary Identifier.
Steps A 3, terminal send msg3 message on the running time-frequency resource of uplink authorization, the C_RNTI of carried terminal oneself, as " 3 C-RNTI MAC Control Element (msg3) " in Fig. 2.Wherein, C_RNTI is Cell Radio Network Temporary Identifier/Identity, Cell-RNTI.Msg3 message is first time scheduled transmission message.
Steps A 4, object base station adopt C_RNTI to carry out Conflict solving, contention resolved result (msg4) is returned, as " 4 DCI 0 with C-RNTI for RRC Connection Reconfiguration Complete (msg4) " in Fig. 2 to terminal.Contention resolved message is accustomed to referred to as msg4 message in this area.DCI 0 is descending control information format 0.
Steps A 5, terminal send RRC Connection Reconfiguration Complete to object base station, Stochastic accessing completes, as " 5 RRC Connection Reconfiguration Complete " in Fig. 2.RRC Connection Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message.
In reconfiguration message, carry rach-Config Dedicated field, then UE initiates non-competing Stochastic accessing, and non-competing random access procedure is relatively simple, as shown in Figure 3, comprises following sub-step:
Step B1, terminal initiate random access preamble(msg1 to object base station) message, carry the preamble index this time accessing and use, as " 1 random access preamble " in Fig. 3.Wherein, random access preamble message is random access preamble message.
Step B2, object base station return random access response(RAR to terminal) message, wherein carry TA Command, UL Grant(uplink authorization) and interim RNTI, as " 2 random access response (RAR) " in Fig. 3.Wherein, random access response message is accidental access response message, and TA Command is time advance commands, and RNTI is Radio Network Temporary Identifier.
Step B3, terminal send RRC Connection Reconfiguration Complete to object base station, Stochastic accessing completes as " 3 RRC Connection Reconfiguration Complete " in Fig. 3.RRC Connection Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message.
So far handoff preparation phase and handover execution stage has been completed, for the sake of ease of implementation, the embodiment of the present invention additionally provides the follow-up step of Stochastic accessing (still switch to example with X2, other switching mode defers to respective process standard), has namely switched the realization in stage:
Step 9, Target eNb send Path Switch Request message to core net, as " 9 Path Switch Request " in Fig. 4, wherein Path Switch Request is path handover request message, in order to notify MME(core net) terminal has been synchronized to Target eNb.MME, after same gateway (Serving Gateway, SGW) is consulted, can select suitable data surface downlink path as " selected SGW and downlink path " in Fig. 4, data retransmission is stopped indicate End Marker and brings source base station.
Step 10, core net reply Path Switch Request Ack message to Target eNb, as " 10 Path Switch Request Ack " in Fig. 4, and make it to stop data retransmission to Source eNb transmission End Marker.Wherein Path Switch Request Ack is path handoff request acknowledgment message, and End Marker is that data retransmission stops indicating.
Step 11, Target eNb send UE Context Release message to Source eNb, make it the relevant information at source release UE, as " 11 UE Context Release " in Fig. 4.Wherein UE Context Release is the next release message on UE.
Step 12, Source eNb releasing UE resources.
Switch similar with X2, other handoff scenario switch as S1 and switch still applicable technical solution of the present invention in station.
Specific embodiment described herein is only illustrate of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described instantiation, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (5)
1. the handover configurations method of LTE system under high-speed mobile scene, is characterized in that: comprise the following steps,
Step one, receive user terminal measurement report before, the physical layer of source base station carries out Doppler shift estimation, adds up and samples, and be reported to high level to Doppler shift value;
Step 2, terminal send Measurement Reports message to source base station, and described Measurement Reports message is for measuring reporting message;
Step 3, source base station carry out switch decision after receiving user terminal measurement report, if allow to switch, then initiate handover request, carry step one gained Doppler shift value in the corresponding message of handover request simultaneously; The corresponding message of handover request is determined as follows according to switching type,
Switching for X2, is initiate Handover Request message to object base station, and described Handover Request message is that X2 switches message;
Switch for S1, be initiate Handover Required message to core net, described Handover Required message is that S1 switches message;
Switching in station, is switch request message in the L2 MAC initiator of object community;
Step 4, object main body carry out resource examination & verification after receiving handover request, if allow to switch, carry out this locality configuration, parse the Doppler shift value in handover request simultaneously and configure to physical layer;
Step 5, object main body reply Handover Request Acknowledge message after completing configuration, described Handover Request Acknowledge message is handoff request acknowledgment message;
Switching for X2, is reply handoff request acknowledgment message to source base station;
Switching for S1, is reply handoff request acknowledgment message to core net;
Switching in station, is reply handoff request acknowledgment message to the L3 RRM/CC module of object community.
2. the handover configurations method of LTE system under high-speed mobile scene according to claim 1, it is characterized in that: in this switching message, carry Doppler shift value, implementation is utilize spare field in the corresponding message of handover request to preserve Doppler shift value.
3. the handover configurations method of LTE system under high-speed mobile scene according to claim 1 or 2, it is characterized in that: when carrying out normal subsequent operation after step 5, doppler bias value is used for the valuation of object base station physical layer about up channel frequency deviation with configuration.
4. the handover configurations method of LTE system under high-speed mobile scene according to claim 3, is characterized in that: switch for X2, carry out normal subsequent operation as follows after step 5,
After source base station receives handoff request acknowledgment message, issue RRC Connection Reconfiguration message to user terminal, make user terminal initiate Stochastic accessing to object base station; Described RRC Connection Reconfiguration message is wireless resource control connection reconfiguration message;
Source base station sends SN Status Transfer message to object base station, described SN Status Transfer is SN state transfer message, and SN is the sequence number of data;
When user terminal switches toward Target cell, re-start synchronous and Stochastic accessing, Target cell directly uses the Doppler shift value of cell-of-origin to carry out demodulation to the upward signal of terminal.
5. the handover configurations method of LTE system under high-speed mobile scene according to claim 4, it is characterized in that: in reconfiguration message, whether carry rach-Config Dedicated field according to base station, user terminal is divided into competition and non-competing two types when initiating Stochastic accessing
Competition Stochastic accessing comprises following sub-step,
Steps A 1, terminal initiate random access preamble message to object base station, carry the preamble index this time accessing and use; Described random access preamble message is random access preamble message;
Steps A 2, object base station return random access response message to terminal, wherein carry TA Command, UL Grant and interim RNTI; Described random access response message is accidental access response message, and TA Command is time advance commands, and UL Grant is uplink authorization, and RNTI is Radio Network Temporary Identifier;
Steps A 3, terminal send C-RNTI MAC Control Elemen message on the running time-frequency resource of uplink authorization, the C_RNTI of carried terminal oneself; Described C-RNTI MAC Control Element message is first time scheduled transmission message, and C_RNTI is Cell Radio Network Temporary Identifier/Identity, Cell-RNTI;
Steps A 4, object base station adopt C_RNTI to carry out Conflict solving, return DCI 0 with C-RNTI for RRC Connection Reconfiguration Complete message to terminal; Described DCI 0 with C-RNTI for RRC Connection Reconfiguration Complete is contention resolved message;
Steps A 5, terminal send RRC Connection Reconfiguration Complete message to object base station, Stochastic accessing completes; RRC Connection Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message;
Non-competing Stochastic accessing comprises following sub-step,
Step B1, terminal initiate random access preamble to object base station, carry the preamble index this time accessing and use; Described random access preamble message is random access preamble message;
Step B2, object base station return random access response message to terminal, wherein carry TA Command, UL Grant and interim RNTI; Described random access response message is accidental access response message, and TA Command is time advance commands, and UL Grant is uplink authorization, and RNTI is Radio Network Temporary Identifier;
Step B3, terminal send RRC Connection Reconfiguration Complete message to object base station, Stochastic accessing completes, and RRC Connection Reconfiguration Complete message is that wireless resource control connection reconfiguration completes message.
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| CN107659969A (en) * | 2017-09-15 | 2018-02-02 | 武汉虹信通信技术有限责任公司 | The method and device of handover success rate is improved in Rail Transit System |
| CN107682899A (en) * | 2016-08-01 | 2018-02-09 | 中兴通讯股份有限公司 | Switching handling method and device |
| CN107872856A (en) * | 2016-09-28 | 2018-04-03 | 中国移动通信有限公司研究院 | A kind of method and device for reducing handover delay |
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| CN108370356A (en) * | 2015-12-07 | 2018-08-03 | 瑞典爱立信有限公司 | Wireless telecom equipment for the time synchronization in cordless communication network and method therein |
| CN107682899A (en) * | 2016-08-01 | 2018-02-09 | 中兴通讯股份有限公司 | Switching handling method and device |
| CN107872856B (en) * | 2016-09-28 | 2020-10-02 | 中国移动通信有限公司研究院 | Method and device for reducing switching time delay |
| CN107872856A (en) * | 2016-09-28 | 2018-04-03 | 中国移动通信有限公司研究院 | A kind of method and device for reducing handover delay |
| CN108064055A (en) * | 2016-11-07 | 2018-05-22 | 中国移动通信有限公司研究院 | A kind of switching method and base station |
| US11109263B2 (en) | 2017-08-11 | 2021-08-31 | Huawei Technologies Co., Ltd. | Data transmission method and data transmission apparatus |
| CN108882334B (en) * | 2017-08-11 | 2019-11-05 | 华为技术有限公司 | A kind of data transmission method, core network user face equipment and source base station |
| US11917450B2 (en) | 2017-08-11 | 2024-02-27 | Huawei Technologies Co., Ltd. | Data transmission method and data transmission apparatus |
| CN108882334A (en) * | 2017-08-11 | 2018-11-23 | 华为技术有限公司 | A kind of data transmission method, core network user face equipment and source base station |
| CN107659969B (en) * | 2017-09-15 | 2020-09-08 | 武汉虹信通信技术有限责任公司 | Method and device for improving switching success rate in rail transit system |
| CN107659969A (en) * | 2017-09-15 | 2018-02-02 | 武汉虹信通信技术有限责任公司 | The method and device of handover success rate is improved in Rail Transit System |
| US11632698B2 (en) | 2017-09-19 | 2023-04-18 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and apparatus for recognizing unmanned aerial vehicle, and mobility management entity and base station |
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| CN108781379A (en) * | 2017-09-19 | 2018-11-09 | 北京小米移动软件有限公司 | The method, apparatus of unmanned plane, mobile management entity and base station for identification |
| CN108781379B (en) * | 2017-09-19 | 2022-02-01 | 北京小米移动软件有限公司 | Method and device for identifying unmanned aerial vehicle, mobile management entity and base station |
| CN107567062A (en) * | 2017-10-09 | 2018-01-09 | 京信通信系统（中国）有限公司 | Information processing method, device and network element device in network element handoff procedure |
| CN111954988A (en) * | 2018-04-05 | 2020-11-17 | 高通股份有限公司 | Techniques for initial access in a wireless system |
| CN111954988B (en) * | 2018-04-05 | 2022-08-16 | 高通股份有限公司 | Techniques for initial access in a wireless system |
| CN110719606A (en) * | 2018-07-12 | 2020-01-21 | 成都鼎桥通信技术有限公司 | Cross-cell mobility method based on asymmetric uplink carrier aggregation |
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