CN104812082B - Method and device for the efficient random access of user equipment - Google Patents
Method and device for the efficient random access of user equipment Download PDFInfo
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- CN104812082B CN104812082B CN201410030568.8A CN201410030568A CN104812082B CN 104812082 B CN104812082 B CN 104812082B CN 201410030568 A CN201410030568 A CN 201410030568A CN 104812082 B CN104812082 B CN 104812082B
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000013507 mapping Methods 0.000 claims abstract description 82
- 238000005259 measurement Methods 0.000 claims abstract description 58
- 230000004044 response Effects 0.000 claims description 44
- 238000004891 communication Methods 0.000 claims description 41
- 230000005540 biological transmission Effects 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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Abstract
The invention discloses a kind of method and devices for the efficient random access of user equipment comprising selects random access lead code number of repetition according to the mobility overview of user equipment.When the mobility overview of user equipment is designated as Hypomobility, using the preceding random access lead code number of repetition for being once successfully accessed to base station；When the mobility overview of user equipment is designated as high mobility, random access lead code number of repetition is determined according to newest downlink measured value and mapping table；When the mobility overview of user equipment is designated as middle mobility, random access lead code number of repetition is selected according to the absolute value of newest downlink measured value and the preceding difference being once successfully accessed between the downlink measured value of base station.Mobility overview is determined by core net according to the number of user equipment connected base station in fixed time period.In this way, reducing the unreasonable selection of lead code number of repetition brought by downlink measurement error and improving the availability of frequency spectrum.
Description
Technical field
The present invention relates to mobile communication fields, more particularly, to the method for user's random access in mobile communication field
And device.
Background technique
Recently in the middle beginning of LTE Release-12 (Long Term Evolution, LTE) about low cost and covering
Enhance machine type communication (Machine Type Communication, the MTC) user of (Coverage Enhanced, CE)
The target of the job of equipment (User Equipment, UE) first is that standardization correspond to 15dB coverage enhancement.
For the coverage enhancement of Physical Random Access Channel (Physical Random Access Channel, PRACH),
It assume that and repeat to send to improve coverage area with existing PRACH lead code form, rather than it is leading to introduce new PRACH
Code format.
In order to make influence of the coverage enhancement for spectrum efficiency that there is flexible controllability, multiple PRACH are needed support
Lead code number of repetition.In the random access procedure, how from the initial random access number of repetition of multiple candidates one is selected
A suitable random access number of repetition, this is that a needs further solve the problems, such as.
In general, following scheme is in order to determine PRACH lead code number of repetition in the random access procedure for consideration:
Optinal plan 1: user equipment determines that PRACH lead code repeats according to the measured value of downlink (such as: RSRP value)
Number.For this scheme, user equipment can determine number of repetition based on measured value and mapping table.The mapping table will join
It is associated with number of repetition to examine signal reception power (Reference Signal Receiving Power, RSRP).User sets
It is standby the downlink measurements of user equipment, such as the reference measured (can be referred to according to its actually located covering state
Signal reception power etc.) adjust PRACH lead code number of repetition.But under severe wireless environment, the measurement of RSRP is
Insecure (typical error is +/- 9dB).And it is required that the MTC user equipment of coverage enhancement, which is usually located at, covers poor ground
Side.So determining that required coverage enhancement grade may be problematic according to RSRP (and the distance of estimation is lost).
Optinal plan 2: user equipment emits since the smallest PRACH lead code number of repetition to determine that PRACH is leading
Code number of repetition.In optinal plan 2, similar to being stepped up of power, (namely normal user equipments are in random access procedure
The method of middle use), in the state of initial access, user equipment can select the smallest PRACH lead code number of repetition first,
And PRACH lead code number of repetition is gradually increased in subsequent random access is attempted, until reaching maximum PRACH lead code
Number of repetition.Therefore, the MTC user equipment of institute's some need coverage enhancement can be held from the smallest PRACH lead code number of repetition
Begin to transmit, in this case will lead to unnecessary PRACH preamble transmissions number (for example, the PRACH lead code repetition time of transmission
Number is lower than number of repetition actually required) it may will increase.In the grade of low number of repetition, PRACH lead code and other use
A possibility that Serious conflicts occurs for family equipment can be very big.
Optinal plan 3: user equipment directlys adopt maximum PRACH lead code number of repetition.In optinal plan 3,
It is initially accessed status user equipment and always selects maximum PRACH lead code number of repetition.If most of MTC user equipmenies are only
Low or medium coverage enhancement grade is needed, this scheme generates resource overhead in the worst case, the resource always
Expense is not only from the transmission with PRACH lead code, the also transmission of message 2/3/4 and corresponding in random access procedure
Control channel (physical downlink control channel (PDCCH) and physical uplink control channel (PUCCH)) expense.
Optinal plan 4: user equipment is once successfully accessed used PRACH lead code number of repetition using preceding.Can
It selects in scheme 4, since in general, CE-MTC user equipment is generally considered close to fixation, for preceding primary
The weight of success random access (i.e. in the upper primary connection that CE-MTC user equipment enters idle mode or is in close state)
Again number may stand good in current random access.Therefore, base station latest configuration can be used in CE-MTC user equipment
Or the PRACH lead code number of repetition that is successfully accessed of last time executes this random access.
It is secondary that above four kinds of optinal plans do not fully consider that PRACH lead code caused by the error of downlink measured value repeats
The irrationality of number selection does not account for selecting rushing between user brought by single PRACH lead code number of repetition
It is prominent.Therefore, designing one kind can be necessary with the PRACH lead code number of repetition of dynamic regulation.
Summary of the invention
According to it is above-mentioned to background technique and understanding, if it is possible to provide and a kind of passing through selection
Suitable random access lead code number of repetition will be very useful come the method and apparatus for improving random access procedure efficiency
's.
According to the first aspect of the invention, a kind of method of random access within a wireless communication network, packet are provided
It includes the following steps executed by the user equipment in the cordless communication network: receiving the user equipment from base station
Mobility overview and measurement threshold value corresponding with the mobility overview, wherein the mobility overview indicates the user
Moving characteristic of the equipment in the communication network is Hypomobility or middle mobility or high mobility；Obtain the user equipment
Newest downlink measured value；When the mobility overview is designated as the middle mobility, the described of the user equipment is calculated
The absolute value of difference between newest downlink measured value and the preceding downlink measured value for being once successfully accessed the base station；And work as institute
When stating mobility overview and being designated as the middle mobility, random access lead code is selected to repeat time according to the absolute value of the difference
Number, wherein being once successfully accessed to the institute of the base station before selection when the absolute value of the difference is less than the measurement threshold value
Random access lead code number of repetition is stated, before otherwise selecting the random access according to the newest downlink measured value and mapping table
Leading code number of repetition.
According to one embodiment of present invention, before the random access corresponding to the mapping table indicating downlink measured value
Leading code number of repetition and the measurement threshold value, the initial value of the mapping table are preset by the user equipment or from described
Base station.
According to one embodiment of present invention, further include when the mobility overview of the user equipment be designated as it is described
When Hypomobility, the random access lead code number of repetition of the base station is once successfully accessed to before selection；When the use
When the mobility overview of family equipment is designated as the high mobility, according to the newest downlink measured value and the mapping table
To determine the random access lead code number of repetition.
It according to one embodiment of present invention, further include recording and being updated successfully to be linked into the described of the base station and connect at random
Enter lead code number of repetition.
It according to one embodiment of present invention, further include according to selected random access lead code number of repetition to described
Base station sends the random access lead code；Determine whether it has received the random access response from the base station: if connect
It has received the random access response from the base station and then continues to execute random access procedure；Come if be not received by
From in the random access response of the base station, then the random access lead code number of repetition is improved according to the mapping table
Until receive from the base station the random access response or reach in the mapping table largest random access before
Leading code number of repetition.
According to the second aspect of the invention, a kind of method of random access within a wireless communication network, packet are provided
Include the following steps executed by the base station in the cordless communication network: if be successfully received from the random of user equipment
Access lead code then sends random access response to the user equipment；The mobility of the user equipment is sent to core net
The request of overview, the mobility overview indicate that moving characteristic of the user equipment in the communication network is Hypomobility
Or middle mobility or high mobility；Receive the mobility overview of the user equipment from the core net；According to
The mobility overview from the user equipment of the core net is that the user device configuration measures threshold value；And
The mobility overview and the measurement threshold value corresponding with the mobility overview are sent to the user equipment.
According to the third aspect of the present invention, a kind of method of random access within a wireless communication network, packet are provided
It includes the following steps executed by the core net in the cordless communication network: receiving asking for the mobility overview from base station
Ask, moving characteristic of the mobility overview instruction user equipment in the communication network be Hypomobility or middle mobility or
High mobility；It is set according to the number of the user equipment connected base station in fixed time period to determine and update the user
The standby mobility overview；And the mobility overview of the user equipment is sent to the base station.
According to the fourth aspect of the present invention, a kind of method of random access within a wireless communication network, packet are provided
It includes the following steps executed by the user equipment in the cordless communication network: obtaining the newest downlink measurement of the user equipment
Value；Random access lead code number of repetition is determined according to the newest downlink measured value and mapping table and is sent to base station random
Access lead code, wherein the random access lead code number of repetition corresponding to the mapping table indicating downlink measured value and
Threshold value is measured, the initial value of the mapping table is preset by the user equipment or from the base station；And receive from
The random access lead code number of repetition of the base station simultaneously connects according to what is received from the described of the base station at random
Enter lead code number of repetition and the newest downlink measured value to update the repetition time of the random access lead code in mapping table
Number.
It according to one embodiment of present invention, further include the random access determined whether it has received from the base station
Response: random access procedure is continued to execute if having received from the random access response of the base station；If
It is not received by the random access response from the base station, then before improving the random access according to the mapping table
Leading code number of repetition until receive from the base station the random access response or reach in the mapping table most
Big random access lead code number of repetition.
According to the fifth aspect of the present invention, a kind of method of random access within a wireless communication network, packet are provided
It includes the following steps executed by the base station in the cordless communication network: receiving the random access preamble from user equipment
Code；Random access lead code number of repetition according to user equipment success random access is one under the user device configuration
The random access lead code number of repetition of secondary random access；And random access next time is sent to the user equipment
The random access lead code number of repetition.
According to the sixth aspect of the invention, connecing in the user equipment of one kind within a wireless communication network at random is provided
Enter device comprising: receiving unit, for receive the user equipment from base station mobility overview and with it is described
For the corresponding measurement threshold value of mobility overview to update mapping table, the mobility overview indicates the user equipment described logical
Moving characteristic in communication network is Hypomobility or middle mobility or high mobility, and the mapping table indicating downlink measured value institute is right
The random access lead code number of repetition and the measurement threshold value answered, the mapping table are preset by user equipment or from institutes
State base station；Measuring unit, for obtaining the newest downlink measured value of the user equipment；Selecting unit is used for according to
The mobility overview of user equipment selects random access lead code number of repetition: when the mobility of the user equipment
When overview is designated as the Hypomobility, repeated using the preceding random access lead code for being once successfully accessed to the base station
Number；When the mobility overview of the user equipment is designated as the high mobility, measured according to the newest downlink
Value and the mapping table determine random access lead code number of repetition；When the mobility overview of the user equipment indicates
When for the middle mobility, the random access lead code weight in random access procedure is selected according to the absolute value of the difference
Again it counts；Computing unit, for calculating institute when the mobility overview of the user equipment is designated as the middle mobility
State the difference between the newest downlink measured value of user equipment and the preceding downlink measured value for being once successfully accessed the base station
Absolute value；First judging unit, for when the mobility overview of the user equipment is designated as middle mobility, according to
The absolute value of the difference determines the random access lead code number of repetition in the random access procedure, wherein when described
When the absolute value of difference is less than the measurement threshold value, the random access preamble of the base station is once successfully accessed to before selection
Otherwise code number of repetition selects the random access lead code to repeat secondary according to the newest downlink measured value and the mapping table
Number；Transmission unit, for sending the random access to the base station according to selected random access lead code number of repetition
Lead code；And second judging unit, for determining whether it has received the random access response from the base station: if
It has received the random access response from the base station and then continues to execute random access procedure；If be not received by
The random access response from the base station then improves the random access lead code repetition time according to the mapping table
Number until receive from the base station the random access response or reach in the mapping table largest random access
Lead code number of repetition；
According to the seventh aspect of the present invention, the random access dress in the base station of one kind within a wireless communication network is provided
It sets comprising the first receiving unit, for receiving the random access lead code from the user equipment；First sends list
Member, if for being successfully received the random access lead code from the user equipment, Xiang Suoshu user equipment hair
Send random access response；Second transmission unit, the request of the mobility overview for sending the user equipment to core net, institute
It states mobility overview and indicates that moving characteristic of the user in the communication network is Hypomobility or middle mobility or high shifting
Dynamic property；Second receiving unit, for receiving the mobility overview of the user equipment from the core net；Configuration
Unit is the user device configuration for the mobility overview according to the user equipment from the core net
Measure threshold value；And third transmission unit, Xiang Suoshu user equipment send the mobility overview and its corresponding survey
Measure threshold value.
According to the eighth aspect of the present invention, the random access in the core net of one kind within a wireless communication network is provided
Device comprising receiving unit, for receiving the request of the mobility overview from the base station, the mobility overview refers to
Show that moving characteristic of the user equipment in the communication network is Hypomobility or middle mobility or high mobility；Determine single
Member, for determining and updating the user equipment according to the number of the user equipment connected base station in fixed time period
Mobility overview；And transmission unit, for sending the mobility overview of the user equipment to the base station.
According to the ninth aspect of the present invention, connecing in the user equipment of one kind within a wireless communication network at random is provided
Enter device comprising measuring unit, for obtaining the newest downlink measured value of the user equipment；First judging unit, is used for
Determine random access lead code number of repetition according to the newest downlink measured value and mapping table and send to base station to connect at random
Enter lead code, wherein the random access lead code number of repetition and institute corresponding to the mapping table indicating downlink measured value
Measurement threshold value is stated, the mapping table is preset by the user equipment or from the base station；Second judging unit, for determining
Whether random access response from the base station is had received: if had received from the described random of the base station
Access response then continues to execute random access procedure；If being not received by the random access from the base station to ring
It answers, then the random access lead code number of repetition is improved until receiving the institute from the base station according to the mapping table
It states random access response or reaches the largest random access lead code number of repetition in the mapping table；Receiving unit, for connecing
Receive the random access lead code number of repetition from the base station and according to the institute from the base station received
Random access lead code number of repetition and the newest downlink measured value are stated to update the random access in the mapping table
Lead code number of repetition.
According to the tenth aspect of the present invention, the random access dress in the base station of one kind within a wireless communication network is provided
It sets comprising receiving unit, for receiving the random access lead code from user equipment；Configuration unit, for according to institute
The random access lead code number of repetition for stating user equipment success random access is that the user device configuration connects at random next time
The random access lead code number of repetition entered；And transmission unit, it is next time random for being sent to the user equipment
The number of repetition of the random access lead code of access.
According to the disclosure of the present invention, a kind of random access of MTC user equipment for coverage enhancement is proposed
Method and device, unique advantage of the invention is: 1) by introduce one can dynamic regulation measurement threshold value, connecing at random
During entering, allow PRACH lead code number of repetition is selected according to its moving characteristic according to user equipment with improve with
The success rate of machine access；2) it compares with conventional method, is repeated as reducing PRACH lead code brought by downlink measurement error
The unreasonable selection of number can optimize random access procedure to avoid mutual between user equipment in the random access procedure
Conflict and reduces unnecessary PRACH lead code number of repetition and improve the availability of frequency spectrum.
Detailed description of the invention
The following detailed description to non-limiting embodiment, other spies of the invention are read by referring to accompanying drawing
Sign, objects and advantages will become more apparent upon.
Fig. 1 shows downlink measured value range and number of repetition and measures the mapping table between threshold value；
Fig. 2 shows the flow charts of random access according to a first embodiment of the present invention；
Fig. 3 shows another flow chart of random access according to a first embodiment of the present invention；And
Fig. 4 shows the schematic diagram of coverage enhancement according to a first embodiment of the present invention.
Fig. 5 shows the flow chart of random access according to a second embodiment of the present invention.
Run through different diagrams in the figure, same or similar appended drawing reference indicates the same or similar device (module)
Or step.
Specific embodiment
In the following detailed description of the preferred embodiment, reference is constituted to the appended attached drawing of present invention a part.Institute
Attached attached drawing, which has been illustrated by way of example, can be realized specific embodiment.Exemplary embodiment is not intended to
Exhaustive all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, can use other
Embodiment can also carry out the modification of structure or logic.Therefore, it is below specific descriptions and it is unrestricted, and this
The range of invention is defined by the claims appended hereto.It should be noted that although describing this hair in attached drawing with particular order
The step of bright middle method, but this does not require that or implies must execute these operations in this particular order, or
It is to have to carry out operation shown in whole to be just able to achieve desired as a result, on the contrary, step described herein can change and hold
Row sequence.Additionally or alternatively, it is convenient to omit multiple steps are merged into step and executed by certain steps, and/or by one
A step decomposes dimension execution of multiple steps.
Normally, with the increase of Signal to Interference plus Noise Ratio (Signal to Interference&Noise Ratio, SINR),
The measuring accuracy of RSRP can improve.Conversely, the measuring accuracy of RSRP can also reduce namely RSRP when SINR is reduced
Measurement error will increase.Although the measuring accuracy of RSRP can be improved by extending measurement period, such as by multiple subframes
The measured value of RSRP be averaged, even if in this way, measurement error still has and can not completely eliminate.
In order to verify potential impact of the measurement error to above scheme 1 of RSRP, it is assumed that one there are three PRACH lead codes
The system and a needs of number of repetition and each number of repetition corresponding to the coverage area enhancing (up to 15dB) of 5dB
The CE-MTC user equipment of 8dB coverage enhancement.When RSRP measurement error is more than 3dB, had according to mapping table as shown in Figure 1 more
A PRACH number of repetition is available, causes the uncertainty of PRACH number of repetition in this way.For example, Fig. 1 shows PRACH
Lead code number of repetition, coverage enhancement grade, the mapping table of corresponding relationship between RSRP measured value and measurement threshold value, according to Fig. 1
If coverage enhancement grade required for user equipment is 8dB, in the ideal case, the value of the RSRP of the user equipment is-
113dBm, then the PRACH lead code number of repetition corresponding to it is 20 times.When RSRP measurement error range is 3.5dB, i.e.,
When the measured value of RSRP is that -109.5dBm arrives -116.5dBm, according to Fig. 1, PRACH lead code number of repetition can be 10,20,
Any one in 50.Therefore, if selected in the insecure situation of measured value of RSRP based on downlink measured value
PRACH lead code number of repetition and CE-MTC user equipment, which are randomly chosen a PRACH lead code, will have similar performance.
In such case, it is contemplated that the semi-static characteristic of CE-MTC user equipment, CE- user equipment can recorde its last time success
It is connected to the PRACH lead code number of repetition of the random access of the same base station, and in random access next time to same base station
Initial access state when attempt reuse identical number of repetition.Downlink in the present invention is measured using RSRP as one
Example, but it is not limited merely to RSRP, the downlink measurement in the present invention may include being adapted to determine that appointing for PRACH lead code
A kind of what downlink measured value.It is described efficiently at random although present embodiments describing by example of CE-MTC user equipment
The process of access, it should be appreciated by those skilled in the art that obviously the present invention is not limited merely to CE-MTC user equipment.
In the first embodiment, the example that RSRP measured value is measured as downlink.In the first embodiment, it introduces
Measurement threshold value.When the absolute value of the difference between newest RSRP measured value and previous RSRP measured value is greater than measurement threshold
Value, CE-MTC user equipment reselect PRACH lead code number of repetition according to mapping table；Otherwise, CE-MTC user equipment will
Using it is the configuration of last base station or it is preceding be once successfully accessed used in PRACH lead code number of repetition.Network can be with CE-
The mobility of MTC user equipment to measure threshold value for the CE-MTC user device configuration.Fig. 2 shows user equipmenies 201 first
The flow chart of the secondary lead code number of repetition selection for accessing network or being lost a preceding random access information is simultaneously hereinafter right
Each step is described in detail.
Step 202: if CE-MTC user equipment 201 did not always access network or once connect at random before being lost
The relevant information entered, in the original state of this random access, CE-MTC user equipment 201 obtains downlink measured value by measurement
(for example, RSRP measured value) determines PRACH lead code number of repetition.For example, RSRP acquired in CE-MTC user equipment 201
Measured value is -113dBm.
Step 204: after obtaining RSRP measured value, CE-MTC user equipment 201 is selected according to mapping table as shown in Figure 1
PRACH lead code number of repetition is 20.The initial value of mapping table can be pre-configured in CE-MTC user equipment 201, can also
To be sent to CE-MTC user equipment 201 in down channel by base station 203.
Step 206: according to the selected PRACH lead code number of repetition of CE-MTC user equipment 201, CE-MTC user is set
Standby 201 send lead code to base station 203.
Step 208: if CE-MTC user equipment 201 can not be successfully accessed to base station 203 namely CE-MTC user
Equipment 201 is not received by the random access response from base station 203, then improves PRACH lead code according to the mapping table
Number of repetition is until receiving from the random access response of base station 203 or before reaching maximum PRACH in the mapping table
Leading code number of repetition.For example, not received yet when CE-MTC user equipment 201 repeats to send lead code 20 times from base station 203
Stochastic phase, number of repetition is increased to 50 times by CE-MTC user equipment 201 according to mapping table.
Step 210: if CE-MTC user equipment 201 has received from the random access response of base station 203 after
It is continuous to execute random access procedure and record downlink measured value.
Step 212: core network element 205, such as mobile management entity (Mobility Management Entity,
MME) the mobility overview of CE-MTC user equipment 201 is divided into according to the mobility history information of CE-MTC user equipment 201
Multiple ranks (for example, Hypomobility, middle mobility and high mobility).Mobility overview include CE-MTC user equipment 201 with
The relevant feature of mobility, such as it is by the same base that whether CE-MTC user equipment, which is connected to network all in long time,
It stands or the CE-MTC user equipment switches between each base station frequently.Core network element 205 is according to CE-MTC user
The number of connected base station in fixed time period of equipment 201 determines and updates the mobility feature of the user.For example,
If CE-MTC user equipment 201 is all to be connected to network, CE-MTC user by the same base station within 72 hours
Equipment 201 is Hypomobility user equipment；If different periods of the CE-MTC user equipment 201 within 72 hours pass through
2 or 3 or 4 base stations are connected to network, then the CE-MTC user equipment 201 is middle mobility user equipment；Such as
Fruit CE-MTC user equipment 201 is connected to network by 4 or more base stations in the different periods within 72 hours, then
The CE-MTC user equipment 201 is high-mobility users equipment.MME in core net can also exist according to user equipment 201
The number of connected base station divides more mobility grades in fixed time period.Core network element can also according to for example with
The movement speed of family equipment, switching frequency etc. divide the mobility grade of user equipment 201.
Step 214: base station 203 sends the mobility of user equipment 201 to core network element 205 by, for example, S1 interface
The request of overview.
Step 216: core network element 205 sends CE-MTC user equipment 201 by, for example, S1 interface, Xiang Jizhan 203
Mobility overview.
Step 218: base station 203 is the user equipment according to the mobility overview of the CE-MTC user equipment 201 received
Configuration measurement threshold value.The range of the measuring accuracy and RSRP measured value of coverage enhancement grade and user equipment measured value has
It closes.In general, mapping as shown in figure 1 represents, and the value of RSRP is smaller, the measured value of CE-MTC user equipment 201 it is accurate
Degree is lower, and required coverage area enhancing higher grade, thus measures threshold value and also increase accordingly.For example, working as RSRP measured value
Range be -110dBm arrive -115dBm when, measurement threshold value value range be 6-8dB.
Step 220: when base station 203 is believed from the mobility overview that core network element 205 receives CE-MTC user equipment 201
Breath, such as when the mobility profile information is designated as middle mobility, base station is that each RSRP range of the user configures measurement
Threshold value.When measurement threshold value changes, base station 203 can be by updated measurement threshold value to CE-MTC user equipment 201.User
Equipment 201 then updates the corresponding measurement threshold value in mapping table.Base station 203 can also will be configured in a manner of broadcast or unicast
Measurement threshold value be sent to CE-MTC user equipment 201, for example, base station 203 can be in physical layer, MAC layer or radio resource control
It makes in (Radio Resource Control, RRC) message to 201 transmission measurement threshold value of CE-MTC user equipment.When base station 203
The mobility profile information of CE-MTC user equipment 201 is received from core network element 205 and the mobile message is designated as low shifting
When dynamic property or high mobility, equally, base station 203 can be set CE-MTC user in physical layer, MAC layer or RRC information
Standby 201 mobility profile information is transferred to CE-MTC user equipment 201.It base station 203 can also be in the case where any other be suitable
The mobility profile information or measurement threshold value are transmitted to CE-MTC user equipment 201 in any other suitable format in row channel.
For example, base station 203 is received from the general about 201 mobility of CE-MTC user equipment of core network element 205
When condition is middle mobility, base station 203 is that the configuration measurement threshold value of CE-MTC user equipment 201 is 8dB and sends the measurement threshold value
To CE-MTC user equipment 201, the corresponding measurement threshold value in mapping table is updated to 8dB by user equipment 201.
Fig. 3 shows another flow chart and below of the lead code number of repetition selection of CE-MTC user equipment 201
In each step is described in detail.
Step 302:CE-MTC user equipment 201 obtains newest RSRP measured value by measurement.For example, CE-MTC user
The newest RSRP measured value of equipment is -122dBm.
Step 304:CE-MTC user equipment 201 according to from the mobility overview that base station 203 receives come before selecting PRACH
Leading code number of repetition.
When the mobility overview of CE-MTC user equipment 201 is designated as middle mobility, CE-MTC user equipment 201 is calculated
The absolute value of newest downlink measured value and the preceding difference being once successfully accessed between the downlink measured value of base station 203, and according to
PRACH lead code number of repetition in the absolute value selection random access procedure of difference.Wherein when the absolute value of difference is less than institute
When stating measurement threshold value, the PRACH lead code number of repetition of base station 203 is once successfully accessed to before selecting, otherwise according to mapping table
Select PRACH lead code number of repetition.
According to newest RSRP measured value -122dBm (such as step 304) and the preceding RSRP measured value-being once successfully accessed
113dBm (step 202) and measurement threshold value 8dB (step 220), it can be deduced that newest RSRP measured value and preceding primary success
The absolute value of the difference of the RSRP measured value of access is 9dB.So according to mapping table select PRACH lead code number of repetition for
50。
When the mobility overview of CE-MTC user equipment 201 is designated as Hypomobility, once it is successfully accessed to using preceding
The PRACH lead code number of repetition of base station 203.For example, the preceding of CE-MTC user equipment 201 is once successfully accessed to base station 203
PRACH lead code number of repetition be 50 times, then CE-MTC user equipment 201 using number of repetition 50 be used as PRACH lead code
Number of repetition.It can also configure corresponding measurement threshold value to be greater than 15dB to indicate once to be successfully accessed to base station 203 using preceding
PRACH lead code number of repetition.
When the mobility overview of CE-MTC user equipment 201 is designated as high mobility, according to newest downlink measured value
PRACH lead code number of repetition is determined with mapping table.For example, according to reflecting in newest RSRP measured value -113dBm and Fig. 1
Firing table, PRACH lead code number of repetition are 50 times.0 can also be set by corresponding measurement threshold value.When CE-MTC user equipment
201 calculate the absolute value of newest downlink measured value and the preceding difference being once successfully accessed between the downlink measured value of base station 203
When, the absolute value of difference is more than or equal to 0, then selects the PRACH lead code number of repetition according to mapping table.
Step 306: according to the selected PRACH lead code number of repetition of CE-MTC user equipment 201, CE-MTC user is set
Standby 201 send lead code to base station 203.
Step 308: if CE-MTC user equipment 201 can not be successfully accessed to base station 203 namely CE-MTC user
Equipment 201 is not received by the random access response from base station 203, then improves PRACH lead code according to mapping table and repeat
Number until receive from base station 203 random access response or reach maximum PRACH lead code in the mapping table
Number of repetition.
Step 310: if CE-MTC user equipment 201 has received from the random access response of base station 203 after
It is continuous to execute random access procedure and record downlink measured value.
Step 312 in Fig. 3 is identical to the step 212 in step 320 and Fig. 2 to step 220, and details are not described herein.
Fig. 4 shows the actual effect of the coverage enhancement in first embodiment when CE-MTC user equipment is middle mobility
Figure.By introduce one can dynamic regulation measurement threshold value, PRACH lead code number of repetition is selected based on downlink measured value
(optinal plan 1) and based on last successfully PRACH lead code number of repetition (optinal plan of the random access to the same base station
4) using area can be adjusted dynamically.When measuring threshold value equal to 0, CE-MTC user equipment is according to downlink measured value
PRACH lead code number of repetition is selected with mapping table；When measurement threshold value is more than 15dB, that is, correspond to maximum
When the grade of coverage enhancement, CE-MTC user equipment uses the previous PRACH lead code weight for being successfully accessed to the same base station
Again it counts.Random access procedure can be optimized in this way to avoid between difference CE-MTC user equipment in the random access procedure
It conflicts with each other, and reduces unnecessary PRACH lead code number of repetition, improve the level of resources utilization.
In a second embodiment, the PRACH according to corresponding to newest RSRP measured value of CE-MTC user equipment 201 is leading
Code number of repetition and be that the PRACH lead code number of repetition that CE-MTC user equipment 201 configures updates from base station 203
Mapping table.Fig. 5 shows the flow chart of PRACH lead code number of repetition selection according to the second embodiment and hereinafter to every
One step is described in detail.
Step 402: if CE-MTC user equipment 201 did not always access network or once connect at random before being lost
The relevant information entered, in the original state of this random access, CE-MTC user equipment 201 obtains downlink measured value by measurement
(for example, RSRP measured value) determines PRACH lead code number of repetition.For example, RSRP acquired in CE-MTC user equipment 201
Measured value is -113dBm.
Step 404: after obtaining RSRP measured value, CE-MTC user equipment 201 is selected according to mapping table as shown in Figure 1
Selecting PRACH lead code number of repetition is 20.The initial value of mapping table can be pre-configured in CE-MTC user equipment 201,
CE-MTC user equipment 201 can be sent in down channel by base station 203.
Step 406: according to the selected PRACH lead code number of repetition of CE-MTC user equipment 201, CE-MTC user is set
Standby 201 send lead code to base station 203.
Step 408: if CE-MTC user equipment 201 can not be successfully accessed to base station 203 namely CE-MTC user
Equipment 201 is not received by the random access response from base station 203, then improves PRACH lead code according to the mapping table
Number of repetition is until receiving from the random access response of base station 203 or before reaching maximum PRACH in the mapping table
Leading code number of repetition.For example, not received yet when CE-MTC user equipment 201 repeats to send lead code 20 times from base station 203
Stochastic phase, number of repetition is increased to 50 times by CE-MTC user equipment 201 according to mapping table.
Step 410: if CE-MTC user equipment 201 has received from the random access response of base station 203 after
It is continuous to execute random access procedure.
Step 412: base station 203 is CE-MTC use according to the successful PRACH lead code number of repetition of CE-MTC user equipment 201
Family equipment 201 configures PRACH lead code number of repetition next time.
Step 414: base station 203 sends PRACH lead code number of repetition next time to CE-MTC user equipment 201.Base station
203 by the PRACH lead code number of repetition configured for CE-MTC user equipment 201 by physical layer, MAC layer or RRC information or
Any suitable downlink transmission mode is sent to the CE-MTC user equipment.If base station 201 has been incited somebody to action in the random access procedure
The lead code number of repetition is sent to CE-MTC user equipment 201 (such as by message 4 in random access procedure) then step
414 can be omitted.
Step 416:CE-MTC user equipment 201 receives the lead code number of repetition from base station 203 and according to reception
To from base station 203 lead code number of repetition and newest downlink measured value come update the lead code in mapping table repeat
Number.If the two is different, will receive from base station 203 is PRACH that CE-MTC user equipment 201 configures
Lead code number of repetition is updated into mapping table.It is can be effectively reduced in this way due to before downlink measurement error bring PRACH
The excessive or very few problem of leading code number of repetition, to reduce unnecessary resource consumption.
For example, in step 402, RSRP measured value acquired in CE-MTC user equipment 201 is -113dBm.Also, base
It stands and 203 learns that random access number of repetition that user 201 is successfully accessed is 50 times.So base station 203 is secondary by random access repetition
Number 50 is configured to PRACH lead code number of repetition next time and is sent to CE-MTC user equipment 201.Correspondingly, CE-MTC is used
RSRP measured value range in mapping table is that -1110dBm arrives the corresponding lead code number of repetition of -115dBm by family equipment 201
It is updated to 50.
Step 418: in next random access procedure, CE-MTC user equipment 201 is obtained newest by measurement
RSRP measured value.
Step 420:CE-MTC user equipment 201 is according to newest RSRP measured value and in upper primary success random access mistake
The mapping table updated after journey selects PRACH lead code number of repetition.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
How from the point of view of, the present embodiments are to be considered as illustrative and not restrictive.In addition, it will be evident that one word of " comprising " not
Exclude other elements and steps, and wording "one" be not excluded for plural number.The multiple element stated in device claim can also
To be implemented by one element.The first, the second equal words are used to indicate names, and are not indicated any particular order.
Claims (13)
1. a kind of method of random access within a wireless communication network, including by the user equipment in the cordless communication network
The following steps of execution:
Receive the mobility overview and measurement corresponding with the mobility overview of the user equipment from base station
Threshold value, wherein the mobility overview indicate moving characteristic of the user equipment in the communication network be Hypomobility or
Middle mobility or high mobility；
Obtain the newest downlink measured value of the user equipment；
When the mobility overview is designated as the middle mobility, the newest downlink measured value of the user equipment is calculated
The absolute value of difference between the preceding downlink measured value for being once successfully accessed the base station；And
When the mobility overview is designated as the middle mobility, random access preamble is selected according to the absolute value of the difference
Code number of repetition, wherein being once successfully accessed to when the absolute value of the difference is less than the measurement threshold value, before selecting described
The random access lead code number of repetition of base station, otherwise according to the newest downlink measured value and mapping table selection it is described with
Machine access lead code number of repetition.
2. the method as described in claim 1, which is characterized in that corresponding to the mapping table indicating downlink measured value it is described with
Machine access lead code number of repetition and the measurement threshold value, the initial value of the mapping table preset by the user equipment or Lai
From in the base station.
3. the method as described in claim 1, which is characterized in that further include when the mobility overview of the user equipment refers to
When being shown as the Hypomobility, the random access lead code number of repetition of the base station is once successfully accessed to before selection；
When the mobility overview of the user equipment is designated as the high mobility, according to the newest downlink measured value and institute
Mapping table is stated to determine the random access lead code number of repetition.
4. the method as described in claim 1, which is characterized in that further include recording and being updated successfully the institute for being linked into the base station
State random access lead code number of repetition.
5. the method as described in claim 1, which is characterized in that further include
The random access lead code is sent to the base station according to selected random access lead code number of repetition；
Determine whether it has received the random access response from the base station:
If having received the random access response from the base station, random access procedure is continued to execute；
If being not received by the random access response from the base station, according to the mapping table improve it is described with
Machine access lead code number of repetition until receive from the base station the random access response or reach the mapping
Largest random access lead code number of repetition in table.
6. a kind of method of random access within a wireless communication network, including being executed by the base station in the cordless communication network
Following steps:
If being successfully received the random access lead code from user equipment, random access is sent to the user equipment
Response；
The request of the mobility overview of the user equipment is sent to core net, the mobility overview indicates the user equipment
Moving characteristic in the communication network is Hypomobility or middle mobility or high mobility；
Receive the mobility overview of the user equipment from the core net；
It is user device configuration measurement according to the mobility overview of the user equipment from the core net
Threshold value；And
The mobility overview and the measurement threshold value corresponding with the mobility overview are sent to the user equipment,
The mobility overview is used to select the random access lead code number of repetition of the user equipment by the user equipment.
7. a kind of method of random access within a wireless communication network, including being held by the core net in the cordless communication network
Capable following steps:
The request of the mobility overview from base station is received, the mobility overview instruction user equipment is in the communication network
In moving characteristic be Hypomobility or middle mobility or high mobility；
The user equipment is determined and updated according to the number of the user equipment connected base station in fixed time period
The mobility overview；And
The mobility overview of the user equipment is sent to the base station, the mobility overview is used by the user equipment
In the random access lead code number of repetition for selecting the user equipment.
8. a kind of method of random access within a wireless communication network, including by the user equipment in the cordless communication network
The following steps of execution:
Obtain the newest downlink measured value of the user equipment；
Determined according to the newest downlink measured value and mapping table random access lead code number of repetition and to base station send with
Machine access lead code, wherein the random access lead code number of repetition corresponding to the mapping table indicating downlink measured value with
And measurement threshold value, the initial value of the mapping table are preset by the user equipment or from the base stations；And
Receive the random access lead code number of repetition from the base station and according to receiving from the base
The random access lead code number of repetition stood and the newest downlink measured value described connect at random come update in mapping table
Enter lead code number of repetition.
9. method as described in claim 8, which is characterized in that further include determining whether it has received from the base station
Random access response:
If having received the random access response from the base station, random access procedure is continued to execute；
If being not received by the random access response from the base station, according to the mapping table improve it is described with
Machine access lead code number of repetition until receive from the base station the random access response or reach the mapping
Largest random access lead code number of repetition in table.
10. the accidental access device in a kind of user equipment within a wireless communication network comprising
Receiving unit, for receive the user equipment from base station mobility overview and with the mobility overview
For corresponding measurement threshold value to update mapping table, the mobility overview indicates the user equipment in the communication network
Moving characteristic is Hypomobility or middle mobility or high mobility, is connect at random corresponding to the mapping table indicating downlink measured value
Enter lead code number of repetition and the measurement threshold value, the mapping table is preset by user equipment or from the base station；
Measuring unit, for obtaining the newest downlink measured value of the user equipment；
Computing unit, for calculating the use when the mobility overview of the user equipment is designated as the middle mobility
Difference between the newest downlink measured value and the preceding downlink measured value for being once successfully accessed the base station of family equipment it is exhausted
To value；
Selecting unit is used to select random access lead code to repeat according to the mobility overview of the user equipment secondary
Number:
When the mobility overview of the user equipment is designated as the Hypomobility, institute is once successfully accessed to using preceding
State the random access lead code number of repetition of base station；
When the mobility overview of the user equipment is designated as the high mobility, according to the newest downlink measured value
The random access lead code number of repetition is determined with the mapping table；
When the mobility overview of the user equipment is designated as the middle mobility, selected according to the absolute value of the difference
Select the random access lead code number of repetition in random access procedure；
First judging unit, for when the mobility overview of the user equipment is designated as middle mobility, according to described
The absolute value of difference determines the random access lead code number of repetition in the random access procedure, wherein when the difference
Absolute value when being less than the measurement threshold value, the preceding random access lead code weight for being once successfully accessed to the base station of selection
Again it counts, the random access lead code number of repetition is otherwise selected according to the newest downlink measured value and the mapping table；
Transmission unit, for sending the random access to the base station according to selected random access lead code number of repetition
Lead code；And
Second judging unit, for determining whether it has received the random access response from the base station:
If having received the random access response from the base station, random access procedure is continued to execute；
If being not received by the random access response from the base station, according to the mapping table improve it is described with
Machine access lead code number of repetition until receive from the base station the random access response or reach the mapping
Largest random access lead code number of repetition in table.
11. the accidental access device in a kind of base station within a wireless communication network comprising
First receiving unit, for receiving the random access lead code from user equipment；
First transmission unit, if for being successfully received the random access lead code from the user equipment, to
The user equipment sends random access response；
Second transmission unit, the request of the mobility overview for sending the user equipment to core net, the mobility are general
Condition indicates that moving characteristic of the user in the communication network is Hypomobility or middle mobility or high mobility；
Second receiving unit, for receiving the mobility overview of the user equipment from the core net；
Configuration unit is the user for the mobility overview according to the user equipment from the core net
Device configuration measures threshold value；And
Third transmission unit, Xiang Suoshu user equipment send the mobility overview and its corresponding measurement threshold value, institute
State the random access lead code number of repetition that mobility overview is used to select the user equipment by the user equipment.
12. the accidental access device in a kind of core net within a wireless communication network comprising
Receiving unit, for receiving the request of the mobility overview from base station, the mobility overview indicates user equipment
Moving characteristic in the communication network is Hypomobility or middle mobility or high mobility；
Judging unit, for determining and updating institute according to the number of the user equipment connected base station in fixed time period
State the mobility overview of user equipment；And
Transmission unit, for sending the mobility overview of the user equipment to the base station, the mobility overview by
The user equipment is used to select the random access lead code number of repetition of the user equipment.
13. the accidental access device in a kind of user equipment within a wireless communication network comprising
Measuring unit, for obtaining the newest downlink measured value of the user equipment；
First judging unit, for determining that it is secondary that random access lead code repeats according to the newest downlink measured value and mapping table
Number simultaneously sends random access lead code to base station, wherein the random access corresponding to the mapping table indicating downlink measured value
Lead code number of repetition and the measurement threshold value, the mapping table are preset by the user equipment or from the base stations；
Second judging unit, for determining whether it has received the random access response from the base station:
If having received the random access response from the base station, random access procedure is continued to execute；
If being not received by the random access response from the base station, according to the mapping table improve it is described with
Machine access lead code number of repetition until receive from the base station the random access response or reach the mapping
Largest random access lead code number of repetition in table；
Receiving unit, for receiving the random access lead code number of repetition from the base station and according to receiving
The mapping is updated from the random access lead code number of repetition of the base station and the newest downlink measured value
The random access lead code number of repetition in table.
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| US11432210B2 (en) * | 2015-10-05 | 2022-08-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Systems and methods providing mobility support for enhanced coverage of wireless devices |
| WO2018027985A1 (en) * | 2016-08-12 | 2018-02-15 | 华为技术有限公司 | Method and apparatus for uplink data transmission of wireless broadband terminal device |
| CN108811160A (en) * | 2017-04-27 | 2018-11-13 | 普天信息技术有限公司 | A kind of the accidental access signal sending method and device of multi-sub-band system |
| CN108882204B (en) * | 2017-05-16 | 2020-11-24 | 电信科学技术研究院 | Method and base station for determining repetition times of machine type communication downlink control channel |
| CN108934023B (en) * | 2017-05-26 | 2022-03-11 | 中兴通讯股份有限公司 | Coverage grade determination, base station and terminal |
| US10708829B2 (en) | 2017-06-16 | 2020-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and device for random access configuration |
| KR102372029B1 (en) * | 2017-09-07 | 2022-03-08 | 삼성전자주식회사 | Method for random access based on mobility and the appratus thereof |
| WO2019080120A1 (en) | 2017-10-27 | 2019-05-02 | Oppo广东移动通信有限公司 | Method and device for wireless communication |
| CN110022610A (en) * | 2018-01-10 | 2019-07-16 | 维沃移动通信有限公司 | A kind of method received and sent messages, terminal device and the network equipment |
| CN110366230B (en) * | 2018-04-11 | 2020-09-25 | 大唐移动通信设备有限公司 | Terminal access method and device |
| CN110769435B (en) * | 2018-07-25 | 2022-08-30 | 中国电信股份有限公司 | Communication method, apparatus, system, and computer-readable storage medium |
| CN110234151B (en) * | 2019-05-05 | 2021-03-12 | 中国联合网络通信集团有限公司 | Terminal access method and device |
| US20220312229A1 (en) * | 2019-06-17 | 2022-09-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and devices for wireless communication |
| CN111800884B (en) * | 2019-07-10 | 2023-02-24 | 维沃移动通信有限公司 | Transmission method and equipment of random access message |
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| JP2009153048A (en) * | 2007-12-21 | 2009-07-09 | Sharp Corp | Mobile station device, base station device, radio communication system, and retransmission method of random access preamble |
| CN101998464A (en) * | 2009-08-14 | 2011-03-30 | 中国移动通信集团公司 | Random access parameter automatic optimization method, system and equipment |
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