CN107277929A - The method of packet delay is reduced in a kind of handoff procedure - Google Patents
The method of packet delay is reduced in a kind of handoff procedure Download PDFInfo
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- CN107277929A CN107277929A CN201610213445.7A CN201610213445A CN107277929A CN 107277929 A CN107277929 A CN 107277929A CN 201610213445 A CN201610213445 A CN 201610213445A CN 107277929 A CN107277929 A CN 107277929A
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- target cell
- target
- cell
- radio resource
- switching command
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Abstract
The method that the present invention proposes reduction packet delay in a kind of handoff procedure, synchronization and subframe alignment between former cell and Target cell, this method includes：K subframes of the eNB before switching command is issued, sends to UE and obtains the up timer command of Target cell, K is integer.The present invention can control UE to obtain the up timing TA information of Target cell, can also configure UE uplink scheduling information, and control UE effectively uses the uplink scheduling information.
Description
Technical field
The present invention relates to communication field, in particular to reduction packet delay in a kind of handoff procedure
Method.
Background technology
With the development of wireless mobile telecommunication technology, people propose more to high-speed, low latency, low cost
Carry out higher requirement.LTE (Long Term Evolution) project is just generated in this context,
Pursue higher peak rate and shorter propagation delay time.
The main performance target of LTE projects includes：20MHz spectral bandwidths can provide descending 100Mbps,
Up 50Mbps peak rate, improves the performance of Cell Edge User, improves cell capacity；Reduction system
Unidirectional transmission time delay is less than 5ms inside system delay, user plane, and control plane is from sleep state to activation shape
State transit time is less than 50ms, and the transit time from resident state to state of activation is less than 100ms；Support
The MPS process of 100Km radiuses；It can be provided for 350Km/h high velocity mobile users>100kbps access
Service；Support paired or non-paired frequency spectrum；Support bandwidth varying, maximum 20M bandwidth.
LTE uses the simple squamous All-IP Network Architecture that access network is made up of NodeB in the network architecture,
This structure is conducive to simplifying network and reducing postponing, and realizes low time delay, and low complex degree will with low cost
Ask.Compared with traditional 3GPP access networks, LTE reduces RNC nodes.ENB not only has original
Outside NodeB function, moreover it is possible to complete original RNC most of function, including physical layer, MAC layer,
RRC, scheduling, Access Control, carrying control, access mobile management etc..Node B and Node B it
Between will use grid (Mesh) mode direct interconnection, this is also the material alteration to original UTRAN structures.
Progressively level off to typical IP broadband network structures.
In physical-layer techniques, LTE employs OFDM (Orthogonal Frequency Division
Multiplexing), the advanced Radio Transmission Technology such as MIMO (Multiple Input Multiple Output)
And link circuit self-adapting scheduling mode and interference coordination technique based on channel.Further increase the speed of user
Rate and cell throughout, improve cell-edge performance.
With the further serious hope of the development of wireless communication technology, and low time delay, high-speed, in LTE-A
The new technology of stage introducing, such as carrier aggregation CA (Carrier Aggregation), relaying Relay technologies,
Multipoint cooperative CoMP (Coordinated Multipoint), eICIC (Enhanced Inter-Cell
Interference Coordination) etc. wireless technology.
In order to further increase LTE capacity, LTE proposes to expand very much LTE capacity using unlicensed spectrum,
Such as LAA (Licensed-Assisted Access), LWA (LTE WLAN Aggregation), LWIP
Technologies such as (LTE WLAN Radio Level Integration with IPsec Tunnel).
The delay of packet is a critically important performance indications such as equipment, operator, at the beginning of LTE is designed
Also serve as a design object.There are many service features to be influenceed by Packet Delay at present, for example：Game,
Such as VoLTE/OTT VoIP of application in real time, visual telephone/meeting etc..Some following business are also to time delay
It is required that harsh, such as remote control/driving vehicle, machine communication and critical communication etc..So in order to
Guarantee LTE evolution and competitiveness is, it is necessary to study the method for reduction packet delay.
In the prior art, the handover delay of handoff procedure is about 40~50ms.Wherein, RACH is (random
Access) process is generally 10~12ms.If former cell, be between Target cell and UE it is synchronous, then
In handoff procedure, UE can just skip RACH processes, directly arrive Target cell and monitor PDCCH.It is false
It is significantly for the service disconnection time delay in handoff procedure if this time is saved.
The purpose of RACH processes is that in the up timing TA of Target cell, (Time Advanced determine acquisition UE
Shi Tiqian) the mandate that information and upstream data are sent.If without RACH processes, then how to obtain
It is the problem of needing to solve to take above- mentioned information.
The content of the invention
In order to solve the problem of background technology is proposed, the present invention proposes that reduction packet prolongs in a kind of handoff procedure
Slow method, the synchronization and during subframe alignment between former cell and Target cell, this method includes：
K subframes of the eNB before switching command is issued, sends to UE and obtains the up timing of Target cell
Order, K is integer.
It is preferred that, this method also includes：In switching command, target BS configuration UE uplink scheduling letter
Breath, and the Radio Resource that the uplink scheduling information comes into force is distributed, the Radio Resource come into force includes start frame
Number position, period distances and the number of times that comes into force, UE send upstream data on the Radio Resource come into force,
If receiving corresponding ACK, it is left untapped radio resource allocation and gives tacit consent to invalid, while eNB is such as
Fruit receives upstream data and successfully decoded on some Radio Resource, then automatic release is remaining untapped wireless
Resource allocation.
It is preferred that, this method also includes：In switching command, target BS configures special PRACH moneys
Source and targeting sequencing, UE send multiple according to maximum transmission power, notify the target BS UE to come
To Target cell be ready to receive PDCCH schedule informations, UE according to the PDCCH of Target cell dispatch
Information sends data in corresponding uplink time/frequency source.
It is further preferred that in the above method, K values are 0, the switching command and acquisition Target cell
Up timer command is issued in a RRC information.
It is another it is further preferred that in the above method, K values are more than 0, and the acquisition Target cell is up
Timer command is issued by PDCCH orders, MAC Control Element or RRC information, carries target small
The Cell Global Identity in area, or carry the physical district ID and frequency point information of Target cell.
The present invention can control UE to obtain the up timing TA information of Target cell, can also configure UE
Uplink scheduling information, and control UE effectively use the uplink scheduling information.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application,
The schematic description and description of the present invention is used to explain the present invention, does not constitute the improper limit to the present invention
It is fixed.In the accompanying drawings：
Fig. 1 is the method implementation process figure of the embodiment of the present invention 1；
Fig. 2 is the schematic diagram of Radio Resource that comes into force of configuration schedules information of the embodiment of the present invention 1；
Fig. 3 is the method implementation process figure of the embodiment of the present invention 2.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application
It can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment 1
It is synchronous, and subframe alignment between the former cell and Target cell of the handoff procedure of the present embodiment.It is former
Side cell configuration UE is measured, and eNB makes switch decision according to measurement result.ENB is issuing switching
Before order, the order for allowing UE to obtain the up timing of Target cell is issued, interval is specified after k subframe, eNB
Switching command is issued again, and now eNB assumes that UE has got the up timing of Target cell.In switching
In order, target side base station configuration UE be used for upstream data send schedule information (including modulation system,
Resource block etc.), and the Radio Resource that the schedule information comes into force is distributed to UE, including：The invalid money come into force
Source is since the corresponding subframe numbers of No. SFN, and the m subframe in interval repeats, and occurs n times altogether.UE
Upstream data is sent on the Radio Resource of distribution, it is remaining to be not used if receiving corresponding ACK
Radio resource allocation acquiescence it is invalid, if while eNB receives upstream data on some Radio Resource,
And successfully decoded, then it is automatic to discharge remaining untapped radio resource allocation.
The present embodiment realizes step as shown in figure 1, specific as follows：
Step 1.1, UE is in RRC_CONNECTED states, and measures, when there is measurement event
Reporting measurement reports during triggering.ENB makes switch decision according to measurement report, determines switching UE to target
Cell, Target cell is identified with PCI (physical district ID).
Step 1.2, eNB issues the TA orders for obtaining and specifying PCI Target cells, can be PDCCH lives
Order or MAC Control Element or RRC information, the E-CGI that the order can carry Target cell are (complete
Ball cell ID), the PCI and frequency point information of Target cell can also be carried.
Step 1.3, UE, which is received, obtains after the TA orders for specifying PCI Target cells, calculates Target cell
TA.
TAtarget=TAsource -2 (T1-T2), T1, T2 are the propagation delay of two cells.
Step 1.4, eNB is spaced k son after the TA orders for obtaining specified PCI Target cells are issued
Frame, issues RRC Connection Reconfiguration message, and carry switching command.In switching life
In order, configuration UE sends the uplink scheduling information of upstream data, also configures the nothing that uplink scheduling information comes into force
Line resource, that is, uplink scheduling information, the wireless money come into force can be used on which Radio Resource by configuring UE
The source cycle occurs, so as shown in Fig. 2 the parameter that need to be configured includes：The starting of the Radio Resource come into force
SFN and subframe numbers, period distances are m subframe and come into force n times altogether.
Here, if eNB issues the order for obtaining Target cell TA and switching command one in step 1.2
Issued in individual RRC information, then in the absence of interval subframe, K values are 0.Now, due in switching command
The relevant information of Target cell has been contained, so, obtaining Target cell TA order need not carry
E-CGI, PCI and frequency point information of Target cell.
Step 1.5, UE selects oneself available uplink scheduling information, is sent on pre-configured ascending resource
Upstream data.
Step 1.6, if eNB receives upstream data, and successfully decoded on pre-configured ascending resource,
Then remaining untapped pre-configured scheduling resource discharges automatically.Otherwise remaining resource remains valid, and
Wait the transmission of upstream data.
Step 1.7, it is remaining untapped pre- if UE receives the ACK information of upstream data transmission
It is invalid that the scheduling resource of configuration discharges automatically.Otherwise remaining resource remains valid, and continues to send line number
According to.
Embodiment 2
It is synchronous, and subframe alignment between the former cell and Target cell of the handoff procedure of the present embodiment.It is former
Side cell configuration UE is measured, and eNB makes switch decision according to measurement result.ENB is issuing switching
Before order, the order for allowing UE to obtain the up timing of Target cell is issued, interval is specified after k subframe, eNB
Switching command is issued again, and now eNB assumes that UE has got the up timing of Target cell.With implementation
Unlike example one：In switching command, target side base station, which does not configure UE, is used for the tune that upstream data is sent
Degree information, but the special PRACH resources of configuration and preamble.UE is sent out according to maximum transmission power
Send repeatedly, such as 2 times, it is therefore an objective to notify the Target cell that the target BS UE has come to be ready to connect
Receive PDCCH schedule informations.Target cell is sent after PDCCH schedule informations, and UE is adjusted according to PDCCH
Spend information and send data in corresponding uplink time/frequency source position.
The present embodiment realizes step as shown in figure 3, specific as follows：
Step 2.1, UE is in RRC_CONNECTED states, and measures, when there is measurement event
Reporting measurement reports during triggering.ENB makes switch decision according to measurement report, determines switching UE to target
Cell.
Step 2.2, eNB issues the TA orders for obtaining and specifying PCI Target cells, can be PDCCH lives
Order or MAC Control Element or RRC information, the E-CGI that the order can carry Target cell are (complete
Ball cell ID), the PCI (physical district ID) and frequency point information of Target cell can also be carried.
Step 2.3, UE, which is received, obtains after the TA orders for specifying PCI Target cells, calculates Target cell
TA.
TAtarget=TAsource- 2 (T1-T2), T1, T2 are the propagation delay of two cells.
Step 2.4, eNB is spaced K son after the TA orders for obtaining specified PCI Target cells are issued
Frame, issues RRC Connection Reconfiguration message, and carry switching command.In switching life
In order, special PRACH resources and special preamble are carried.
Here, if eNB issues the order for obtaining Target cell TA and switching command one in step 2.2
Issued in individual RRC information, then in the absence of interval subframe, K values are 0.
Step 2.5, UE sends special according to maximum transmission power in the PRACH resources of configuration
preamble.For example send 2 times, but be not to wait for RAR processes, purpose is to notify target BS UE
Target cell is had come to, is ready to receive PDCCH schedule informations.
Step 2.6, Target cell sends PDCCH schedule informations.
Step 2.7, UE sends data according to PDCCH schedule informations in corresponding uplink time/frequency source position.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for ability
For the technical staff in domain, the present invention can have various modifications and variations.It is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc., should be included in protection scope of the present invention it
It is interior.
Claims (5)
1. the method for packet delay is reduced in a kind of handoff procedure, between former cell and Target cell synchronously simultaneously
And subframe alignment, it is characterised in that methods described includes：
K subframes of the eNB before switching command is issued, sends to UE and obtains the up timing of Target cell
Order, K is integer.
2. according to the method described in claim 1, it is characterised in that methods described also includes：
In switching command, target BS configures UE uplink scheduling information, and distributes uplink scheduling letter
The Radio Resource come into force is ceased, the Radio Resource come into force includes initial frame number position, period distances and life
Number of times is imitated, UE sends upstream data on the Radio Resource come into force, if receiving corresponding ACK,
Then it is left untapped radio resource allocation acquiescence invalid, if while eNB is received on some Radio Resource
To upstream data and successfully decoded, then untapped radio resource allocation is left in automatic release.
3. according to the method described in claim 1, it is characterised in that methods described also includes：
In switching command, target BS configures special PRACH resources and targeting sequencing, UE according to
Maximum transmission power sends multiple, notifies the Target cell that the target BS UE has come to be ready to receive
PDCCH schedule informations, UE is provided according to the PDCCH schedule informations of Target cell in corresponding up time-frequency
Data are sent on source.
4. according to the method in claim 2 or 3, it is characterised in that：
K values are 0, and the switching command and the acquisition up timer command of Target cell are in a RRC information
In issue.
5. according to the method in claim 2 or 3, it is characterised in that：
K values are more than 0, and the acquisition up timer command of Target cell passes through PDCCH orders, MAC
Control unit or RRC information are issued, and carry the Cell Global Identity of Target cell, or carry target
The physical district ID and frequency point information of cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610213445.7A CN107277929A (en) | 2016-04-07 | 2016-04-07 | The method of packet delay is reduced in a kind of handoff procedure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610213445.7A CN107277929A (en) | 2016-04-07 | 2016-04-07 | The method of packet delay is reduced in a kind of handoff procedure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111526577A (en) * | 2019-02-01 | 2020-08-11 | 华为技术有限公司 | Clock synchronization method and equipment |
| WO2021022431A1 (en) * | 2019-08-02 | 2021-02-11 | 华为技术有限公司 | Resource processing method and apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357726A (en) * | 2015-12-11 | 2016-02-24 | 江苏鑫软图无线技术有限公司 | LTE quick switching method based on downlink timely deviation and target base station pre-authorization |
-
2016
- 2016-04-07 CN CN201610213445.7A patent/CN107277929A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357726A (en) * | 2015-12-11 | 2016-02-24 | 江苏鑫软图无线技术有限公司 | LTE quick switching method based on downlink timely deviation and target base station pre-authorization |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111526577A (en) * | 2019-02-01 | 2020-08-11 | 华为技术有限公司 | Clock synchronization method and equipment |
| WO2021022431A1 (en) * | 2019-08-02 | 2021-02-11 | 华为技术有限公司 | Resource processing method and apparatus |
| CN114128394A (en) * | 2019-08-02 | 2022-03-01 | 华为技术有限公司 | Resource processing method and device |
| CN114128394B (en) * | 2019-08-02 | 2024-04-09 | 华为技术有限公司 | Resource processing method and device |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171020 |
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