CN103916973B - The method and user equipment of random access ultra-large type cell - Google Patents
The method and user equipment of random access ultra-large type cell Download PDFInfo
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Abstract
The invention discloses the methods and user equipment of random access ultra-large type cell.Method includes：UE preserves the PRACH minislot parameters of ultra-large type cell, wherein the PRACH minislot parameters of ultra-large type cell are calculated according to the radius of society and maximum delay expanding value of ultra-large type cell；When UE will be switched to target ultra-large type cell from cell-of-origin, the subframe position of the PRACH time slots of target eNodeB is obtained from source eNodeB, according to the subframe position information of PRACH time slots, the PRACH minislot parameters of itself configuration, random access is initiated to target eNodeB in corresponding subframe position.The present invention enables to the UE access ultra-large type cell in LTE system.
Description
Technical field
The present invention relates to wireless technical fields, and in particular to the method and user equipment of random access ultra-large type cell（UE,
User Equipment）.
Background technology
In long term evolution（LTE, Long Term Evolution）In system, for frequency division duplex（FDD, Frequency
Division Duplexing）Cell, the theoretical upper limit of radius of society is by Physical Random Access Channel（PRACH, Physical
Random Access Channel）Cyclic prefix in time slot（CP, Cyclic Prefix）Or protection interval（GP, Guard
Period）It determines.Specific formula for calculation is as follows：
Wherein, Rupper_limitIndicate the theoretical upper limit of radius of society；C indicates the light velocity；TCPIndicate CP in PRACH time slots
Duration；DSmaxThe maximum delay expanding value for indicating cell, takes 5.2 microseconds under normal circumstances（μs）, for bigger or super large
The cell of type can use 16.67 μ s；TGPIndicate the duration of GP in PRACH time slots；Min () indicates the function that gets the small value.
In this way, being calculated according to current PRACH minislot parameters, the radius of society theoretical maximum upper limit supported is
100.16 kilometer（Km）.
Presently, there are the demand of ultra-large type cell, application scenarios include but not limited to the wireless coverage solution party of airline
Case.The maximal cover radius of this cell can reach 230Km or so, the ability that can be supported far beyond current agreement.
For the cell that radius is more than 100.16Km, if still using current PRACH minislot parameters, it can not protect
The random access leader sequence that card UE is sent out（Preamble sequence）Completely fall into evolution base station（ENodeB,
evolved Node Base）Watch window in, and then lead to random access failure.Such as：UE1 distances eNodeB is not super
Spend current supported upper limit 100.16Km, therefore UE1 corresponding two-way times（RTT, Round-Trip Time）1 does not exceed
CP durations, eNodeB can receive the complete random access leader sequence of UE1 in watch window；If UE2 distances
ENodeB has been more than 100.16Km, then situation is just different, the RTT2 of UE2 can be more than CP durations, therefore the random access of UE2
Targeting sequencing also cannot be received completely by eNodeB, and then cause UE2 that can not normally access the cell.
For ultra-large type cell, PARCH minislot parameters how are redesigned so that UE can normally access Target cell,
There is presently no solutions.
Invention content
The present invention provides the method and LTE UE, eNodeB, LTE system of random access ultra-large type cell, so that LTE systems
UE in system has access to ultra-large type cell.
The technical proposal of the invention is realized in this way：
A kind of method of random access ultra-large type cell, this method include：
User equipment (UE) preserves the Physical Random Access Channel PRACH minislot parameters of ultra-large type cell, and the ultra-large type is small
The PRACH minislot parameters in area are calculated according to the radius of society and maximum delay expanding value of ultra-large type cell；
When UE will be switched to target ultra-large type cell from cell-of-origin, target eNodeB is obtained from source evolution base station eNodeB
PRACH time slots subframe position, according to the subframe position information of PRACH time slots, itself configuration PRACH minislot parameters,
In corresponding subframe position random access is initiated to target eNodeB.
The PRACH minislot parameters of the ultra-large type cell are calculated according to following formula：
Wherein, TCPIndicate the duration of cyclic prefix CP in PRACH time slots；R indicates radius of society；C indicates the light velocity；DSmaxTable
The maximum delay expanding value for showing cell, for ultra-large type cell, DSmax>5.2μs；TSEQIndicate targeting sequencing in PRACH time slots
Duration；TGPIndicate the duration of protection interval GP in PRACH time slots；N indicates that the positive integer of different value can be taken.
The PRACH minislot parameters that the UE preserves ultra-large type cell further comprise：
UE preserves the random access probability number that single ultra-large type community user is initiated in the unit interval, the unit interval
The random access probability number that interior single ultra-large type community user is initiated is the radius of society and cell according to ultra-large type cell
Average user number is calculated；
The UE initiates random access in corresponding subframe position to target eNodeB：
Other than according to the PRACH minislot parameters of the subframe position information of PRACH time slots, itself configuration, while basis
The random access probability number that single ultra-large type community user is initiated in unit interval, to target in corresponding subframe position
ENodeB initiates random access.
The random access probability number that single ultra-large type community user is initiated in the unit interval is obtained according to following formula
It arrives：
Wherein, NRAFor the random access probability number that single ultra-large type community user is initiated in the unit time；R is ultra-large type
Radius of society；M is ultra-large type cell average user number, can be empirically determined；P is that everyone initiates per hour in ultra-large type cell
Mean random access number, can be empirically determined；D is the average distance of arbitrary two terminal room in ultra-large type cell, can basis
It is empirically determined.
The subframe position that the UE obtains the PRACH time slots of target eNodeB from source eNodeB includes：
UE obtains target eNodeB's by the source eNodeB system information block SIB2 sent or mobile control informational messages
The subframe position of PRACH time slots.
The UE initiates to further comprise after random access in corresponding subframe position to target eNodeB：
Target eNodeB receives the random access leader sequence of UE in random access watch window, the watch window
Length is determined according to the PRACH minislot parameters.
A kind of UE in LTE system, including：
Configuration module：Preserve the PRACH minislot parameters of ultra-large type cell, the PRACH minislot parameters of the ultra-large type cell
It is calculated according to the radius of society of ultra-large type cell and maximum delay expanding value；
Random access module：When this UE will be switched to target ultra-large type cell from cell-of-origin, mesh is obtained from source eNodeB
The subframe position for marking the PRACH time slots of eNodeB is joined according to the PRACH time slots in the subframe position of PRACH time slots, configuration module
Number initiates random access in corresponding subframe position to target eNodeB.
The PRACH minislot parameters of ultra-large type cell in the configuration module are calculated according to following formula：
Wherein, TCPIndicate the duration of CP in PRACH time slots；R indicates radius of society；C indicates the light velocity；DSmaxIndicate cell
Maximum delay expanding value, for ultra-large type cell, DSmax>5.2μs；TSEQIndicate the duration of targeting sequencing in PRACH time slots；TGP
Indicate the duration of GP in PRACH time slots；N indicates that the positive integer of different value can be taken.
The configuration module is further used for, and preserves the random access that single ultra-large type community user is initiated in the unit interval
Probability number, the random access probability number that single ultra-large type community user is initiated in the unit interval are small according to ultra-large type
The radius of society and cell average user number in area are calculated；
The random access module is further used for, in addition to according to the subframe position information of PRACH time slots, itself configuration
Except PRACH minislot parameters, while the random access probability number initiated according to single ultra-large type community user in the unit interval,
In corresponding subframe position random access is initiated to target eNodeB.
The random access probability time that single ultra-large type community user is initiated in unit interval in the configuration module is several
It is obtained according to following formula：
Wherein, NRAFor the random access probability number that single ultra-large type community user is initiated in the unit time；R is ultra-large type
Radius of society；M is ultra-large type cell average user number, can be empirically determined；P is that everyone initiates per hour in ultra-large type cell
Mean random access number, can be empirically determined；D is the average distance of arbitrary two terminal room in ultra-large type cell, can basis
It is empirically determined.
The system information block SIB2 or mobile control informational messages that the random access module is sent by source eNodeB obtain
Take the subframe position of the PRACH time slots of target eNodeB.
A kind of eNodeB, including：
Configuration module：The PRACH minislot parameters of ultra-large type cell are preserved, random access watch window information is preserved, wherein
The PRACH minislot parameters of ultra-large type cell are to be calculated according to the radius of society and maximum delay expanding value of ultra-large type cell
, the length of random access watch window is determined according to PRACH minislot parameters；
Random access processing module：According to the random access watch window information that configuration module configures, in the watch window
The random access leader sequence that interior reception UE is sent.
The eNodeB further comprises：Cell hand-off process module, for being directed to a super large when receive that UE sends
When the cell switching request of type cell, the subframe position information of the PRACH time slots of target eNodeB is carried in SIB2 or movement
It is sent to UE in control informational message.
A kind of LTE system, including：
UE：The PRACH minislot parameters for preserving ultra-large type cell, according to the PRACH minislot parameters of the ultra-large type cell
The radius of society and maximum delay expanding value of ultra-large type cell are calculated；When this UE will be switched to target super large from cell-of-origin
When type cell, the subframe position of the PRACH time slots of target eNodeB is obtained from source eNodeB, according to the subframe position of PRACH time slots
It sets, PRACH minislot parameters, random access is initiated to target eNodeB in corresponding subframe position；
eNodeB：The PRACH minislot parameters of ultra-large type cell are preserved, random access watch window information is preserved, is observing
The random access leader sequence that UE is sent is received in window, wherein the length of random access watch window is joined according to PRACH time slots
Number determines.
The UE is further used for, and preserves the random access probability that single ultra-large type community user is initiated in the unit interval
Number, the random access probability number that single ultra-large type community user is initiated in the unit interval is according to the small of ultra-large type cell
Area's radius and cell average user number are calculated, and, in addition to the subframe position information according to PRACH time slots, itself configuration
PRACH minislot parameters except, while the random access probability initiated according to single ultra-large type community user in the unit interval
Number initiates random access in corresponding subframe position to target eNodeB.
The eNodeB further comprises：Cell hand-off process module, for being directed to a super large when receive that UE sends
When the cell switching request of type cell, the subframe position information of the PRACH time slots of target eNodeB is carried in SIB2 or movement
It is sent to UE in control informational message.
Compared with prior art, the present invention enables to UE access ultra-large type cell.
Description of the drawings
Fig. 1 is the method flow diagram of random access ultra-large type cell in LTE system provided in an embodiment of the present invention；
Fig. 2 is that the present invention covers schematic diagram using the course line in example；
Fig. 3 is the present invention using PRACH time slot format schematic diagrames under the airline covering scene in example；
Fig. 4 is the composition schematic diagram of the UE in LTE system provided in an embodiment of the present invention；
Fig. 5 is the composition schematic diagram of eNodeB provided in an embodiment of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further described in more detail.
Fig. 1 is the method flow diagram of random access ultra-large type cell in LTE system provided in an embodiment of the present invention, such as Fig. 1
It is shown, it is as follows：
Step 101：According to the radius of society of ultra-large type cell and maximum delay expanding value, ultra-large type cell is calculated
PRACH minislot parameters.
Here, ultra-large type cell refers generally to the cell that radius is more than 100.16Km.
PRACH time slots are made of three parts, i.e. CP, targeting sequencing（Preamble sequence）, GP, this three parts
Duration must all beIntegral multiple.
It, can be according to such as following formula in the embodiment of the present invention（1）~（5）Calculate TCP、TSEQ、TGP：
Above-mentioned formula（1）~（5）In, TCPIndicate the duration of CP in PRACH time slots；R indicates radius of society；C indicates the light velocity；
DSmaxThe maximum delay expanding value for indicating cell, for ultra-large type cell, DSmax>5.2 μ s, such as desirable 16.67 μ s；TSEQIt indicates
The duration of Preamble sequence in PRACH time slots；TGPIndicate the duration of GP in PRACH time slots；Formula（2）And formula（5）In
N indicates that the positive integer of different value can be taken.
According to formula（1）~（5）It can obtain three parameter values in the PRACH time slots of ultra-large type cell：TCP、TSEQ、TGP。
Step 102：The random access probability times N that single ultra-large type community user is initiated in the unit of account timeRA。
The calculation formula for the random access probability number that single ultra-large type community user is initiated in unit interval is as follows：
Wherein, NRAFor the random access probability number that single ultra-large type community user is initiated in the unit time；R is ultra-large type
Radius of society；M is ultra-large type cell average user number, can be empirically determined；P is that everyone initiates per hour in ultra-large type cell
Mean random access number, can be empirically determined；D is the average distance of arbitrary two terminal room in ultra-large type cell, can basis
It is empirically determined.
PRACH random access chances（occasion）Configuration to two aspect it is related：First, single small in the unit interval
Area's Client-initiated random access probability number, the value are related with the loading condition of cell or number of users；Second is that single UE is used
The control plane handover delay at family, the value are an important performance indicators of system.
Inverse is asked to can be obtained single subdistrict single subdistrict Client-initiated random access probability number in the unit interval
User initiates the average time interval of random access, when which should be less than the control plane switching of single UE user
Prolong.
Step 103：Subframe position is distributed for the PRACH time slots of ultra-large type cell.
Here, the subframe position for the PRACH time slots of ultra-large type cell distribution should not be with the son of existing PRACH time slots
Frame position conflict.Here subframe position includes：System Frame Number and subframe numbers.
The subframe position of the PRACH time slots of ultra-large type cell may have it is multiple, can be PRACH time slots each subframe position
Set one PRACH configuration index of distribution.
Step 104：The length of the random access watch window of eNodeB is determined according to the PRACH minislot parameters of ultra-large type cell
Degree.
This step can be achieved by the prior art.
Step 105：The PRACH minislot parameters of ultra-large type cell are configured on eNodeB and each UE, random access is seen
The length for examining window is configured on eNodeB, the random access probability that single ultra-large type community user in the unit interval is initiated
Number NRAIt is configured on each UE.
Step 106：When UE will be switched to target ultra-large type cell from cell-of-origin, initiate to carry target to source eNodeB
The cell switching request of eNodeB marks, source eNodeB receives the request, by the subframe position of the PRACH time slots of target eNodeB
Confidence breath is handed down to UE.
The subframe position information of the PRACH time slots of target eNodeB can be passed through system information block 2 by source eNodeB（SIB2,
System Information Block2）Or mobile control information（MobilityControlInfo）Message is handed down to UE.
The RRC connection reconfigurations that MobilityControlInfo is used in cell switch process are set.
In practical applications, if the subframe position of PRACH time slots has multiple, source eNodeB can be only by target eNodeB
The corresponding PRACH configuration indexes of subframe position of the PRACH time slots used are handed down to UE, and UE is true according to the PRACH configuration indexes
Determine the subframe position of PRACH time slots.
Subframe position information or the PRACH configurations of the PRACH time slots of each eNodeB can be pre-configured on each eNodeB
Index is directly achieved with target in this way when receiving the cell switching request of UE initiations from the configuration information of itself
The subframe position information or PRACH configuration indexes of the PRACH time slots of eNodeB, to be supplied to UE；Alternatively, when source eNodeB connects
When receiving the cell switching request of UE initiations, when then being interacted with target eNodeB progress cell hand off signaling, from target
The subframe position information or PRACH configuration indexes that the PRACH time slots of target eNodeB are obtained at eNodeB, to be supplied to UE.
Step 107：UE receives the subframe position information of the PRACH time slots of target eNodeB, the PRACH configured in conjunction with itself
Minislot parameter, the random access probability number that single ultra-large type community user is initiated in the unit interval, in corresponding subframe position
Random access is initiated to target eNodeB.
Step 108：Target eNodeB receives the random access leader sequence that UE is sent on random access watch window.
The application example of the present invention is given below：
By taking airline covering scene as an example, Fig. 2 is that course line covers schematic diagram, as shown in Fig. 2, for course line covering scene
For,Wherein, R is radius of society, and L is course line covering radius, and H is enroute altitude.
If course line covering radius L is 230Km, enroute altitude H takes 10Km, then radius of society R=230.22Km.
Then random access procedure is as follows：
Step 01：In DSmaxIn the case of taking 16.67 μ s, according to formula（1）~（5）It can obtain meeting the requirements such as next group
Configuration Values：
Combined type（6）
Therefore, 230.22Km is reached for radius of society（The covering radius of 230Km under corresponding course line covering scene）Super large
Type cell demand needs one group of completely new PRACH minislot parameter, for example above-mentioned combined type of design parameter value（6）It is shown.Fig. 3 is provided
PRACH time slot format schematic diagrames under airline covering scene.
Step 02：Single subdistrict Client-initiated random access probability number in the unit of account time：
According to relevant regulations, the minimum safe distance of interplane is 6Km, it is assumed that per 300 people of airplane carrying, everyone is per small
Shi Pingjun initiates 5 service accesses, then interior single subdistrict Client-initiated random access probability number per second is：
In formula, 460 be cell diameter；So it should be enough to provide a PRACH occasion per 20ms.
The handover delay of existing system（handover delay）Calculating formula it is as follows：
Dhandover=DRRC_procedure+Tsearch+TIU+20ms
Wherein, DRRC_procedureFor maximum radio resource control process time delay（RRC procedure delay）, it is worth and is
15ms；TsearchIt is 0 known to Target cell；TIUTo obtain the available PRACH occasion of Target cell first
Duration, and think that 30ms is not to be exceeded in maximum, D can be calculated in this wayRRC_procedure≤65ms。
Consider handover delay index request, the T of systemIUProtocol specification and random access no more than 30ms are providing
Overhead issues on source, for airline covering scene, it should compare conjunction that a PRACH occasion is provided per 20ms
A kind of suitable configuration.
Step 03：Subframe position is distributed for the PRACH time slots of the ultra-large type cell under the covering scene of course line.
The total duration of PRACH time slots is 5ms, and can distribute subframe position is：System Frame Number：Even number+subframe numbers：1, at this time
Corresponding PRACH configuration indexes are 64；Alternatively, System Frame Number：Even number+subframe：6, at this time corresponding PRACH configuration indexes be
65。
Step 04：The length of the random access watch window of eNodeB is determined according to the PRACH minislot parameters of ultra-large type cell
Degree.
Step 05：The PRACH minislot parameters of ultra-large type cell are configured on eNodeB and each UE, random access is observed
The length of window is configured on eNodeB, by the random access probability number that single ultra-large type community user is initiated in the unit interval
NRAIt is configured on each UE.
Step 06：When UE will be switched to target ultra-large type cell from cell-of-origin, initiate to carry target to source eNodeB
The cell switching request of eNodeB marks, source eNodeB receive the request, the PRACH configuration indexes of target eNodeB are issued
To UE.
Step 07：UE determines the subframe position of PRACH time slots according to the PRACH configuration indexes of target eNodeB, in conjunction with certainly
The PRACH minislot parameters of body configuration, the random access probability number that single ultra-large type community user is initiated in the unit interval, right
It answers and initiates random access to target eNodeB in subframe position.
Step 08：Target eNodeB receives the random access leader sequence that UE is sent on random access watch window.
Fig. 4 is the composition schematic diagram of the UE in LTE system provided in an embodiment of the present invention, as shown in figure 4, it is mainly wrapped
It includes：Configuration module 41 and random access module 42, wherein：
Configuration module 41：Preserve PRACH minislot parameters, the single ultra-large type community user in the unit interval of ultra-large type cell
The random access probability number of initiation, wherein ultra-large type cell is the cell that radius is more than 100.16Km, ultra-large type cell
PRACH minislot parameters are calculated according to the radius of society and maximum delay expanding value of ultra-large type cell, in the unit interval
The random access probability number that single ultra-large type community user is initiated is flat according to the radius of society and cell of ultra-large type cell
Equal number of users is calculated.
Random access module 42：When this UE will be switched to target ultra-large type cell from cell-of-origin, obtained from source eNodeB
The subframe position of the PRACH time slots of target eNodeB, when according to PRACH in the subframe position of PRACH time slots, configuration module 41
Gap parameter and the random access probability number that single ultra-large type community user is initiated in the unit interval, in corresponding subframe position
Random access is initiated to target eNodeB.
Random access module 42 can obtain target by the SIB2 or mobile control informational messages that source eNodeB is sent
The subframe position of the PRACH time slots of eNodeB.
Fig. 5 is the composition schematic diagram of eNodeB provided in an embodiment of the present invention, as shown in figure 5, it includes mainly：Configure mould
Block 51 and random access processing module 52, wherein：
Configuration module 51：The PRACH minislot parameters of ultra-large type cell are preserved, random access watch window information is preserved,
In, ultra-large type cell is the cell that radius is more than 100.16Km, and the PRACH minislot parameters of ultra-large type cell are small according to ultra-large type
The radius of society and maximum delay expanding value in area are calculated, and the length of random access watch window is joined according to PRACH time slots
Number determines.
Random access processing module 52：According to the random access watch window information that configuration module 51 configures, in the observation
The random access leader sequence that UE is sent is received in window.
ENodeB can further comprise：Cell hand-off process module, for being directed to a ultra-large type when receive that UE sends
When the cell switching request of cell, the subframe position information of the PRACH time slots of target eNodeB is carried and is controlled in SIB2 or mobile
It is sent to UE in informational message processed.
A kind of LTE system, including UE as shown in Figure 4 and eNodeB as shown in Figure 5 can also be provided in the embodiment of the present invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Claims (9)
1. a kind of method of random access ultra-large type cell, which is characterized in that this method includes：
User equipment (UE) preserves the Physical Random Access Channel PRACH minislot parameters of ultra-large type cell, the ultra-large type cell
PRACH minislot parameters are calculated according to the radius of society and maximum delay expanding value of ultra-large type cell；
When UE will be switched to target ultra-large type cell from cell-of-origin, obtain target eNodeB's from source evolution base station eNodeB
The subframe position of PRACH time slots, according to the subframe position information of PRACH time slots, the PRACH minislot parameters of itself configuration, right
It answers and initiates random access to target eNodeB in subframe position；
The PRACH minislot parameters of the ultra-large type cell are calculated according to following formula：
Wherein, TCPIndicate the duration of cyclic prefix CP in PRACH time slots；R indicates radius of society；C indicates the light velocity；DSmaxIndicate small
The maximum delay expanding value in area, for ultra-large type cell, DSmax>5.2μs；TSEQIndicate PRACH time slots in targeting sequencing when
It is long；TGPIndicate the duration of protection interval GP in PRACH time slots；N indicates that the positive integer of different value can be taken；
The PRACH minislot parameters that the UE preserves ultra-large type cell further comprise：
UE preserves the random access probability number that single ultra-large type community user is initiated in the unit interval, single in the unit interval
The random access probability number that a ultra-large type community user is initiated is average according to the radius of society and cell of ultra-large type cell
Number of users is calculated；
The UE initiates random access in corresponding subframe position to target eNodeB：
Other than according to the PRACH minislot parameters of the subframe position information of PRACH time slots, itself configuration, while according to unit
The random access probability number that single ultra-large type community user is initiated in time is sent out in corresponding subframe position to target eNodeB
Play random access.
2. according to the method described in claim 1, it is characterized in that, single ultra-large type community user is initiated in the unit interval
Random access probability number obtained according to following formula：
Wherein, NRAFor the random access probability number that single ultra-large type community user is initiated in the unit time；R is ultra-large type cell
Radius；M is ultra-large type cell average user number, can be empirically determined；P be in ultra-large type cell everyone initiate per hour it is flat
Equal random access number, can be empirically determined；D is the average distance of arbitrary two terminal room in ultra-large type cell, can be rule of thumb
It determines.
3. according to the method described in claim 1, it is characterized in that, the UE obtains target eNodeB's from source eNodeB
The subframe position of PRACH time slots includes：
UE obtains the PRACH of target eNodeB by the source eNodeB system information block SIB2 sent or mobile control informational messages
The subframe position of time slot.
4. according to the method described in claim 1, it is characterized in that, the UE is sent out in corresponding subframe position to target eNodeB
Random access is played later to further comprise：
Target eNodeB receives the random access leader sequence of UE, the length of the watch window in random access watch window
It is determined according to the PRACH minislot parameters.
5. the UE in a kind of LTE system, which is characterized in that including：
Configuration module：The PRACH minislot parameters of ultra-large type cell are preserved, the PRACH minislot parameters of the ultra-large type cell are root
It is calculated according to the radius of society and maximum delay expanding value of ultra-large type cell；
Random access module：When this UE will be switched to target ultra-large type cell from cell-of-origin, target is obtained from source eNodeB
The subframe position of the PRACH time slots of eNodeB is joined according to the PRACH time slots in the subframe position of PRACH time slots, configuration module
Number initiates random access in corresponding subframe position to target eNodeB；
The PRACH minislot parameters of ultra-large type cell in the configuration module are calculated according to following formula：
Wherein, TCPIndicate the duration of CP in PRACH time slots；R indicates radius of society；C indicates the light velocity；DSmaxIndicate the maximum of cell
Delay spread value, for ultra-large type cell, DSmax>5.2μs；TSEQIndicate the duration of targeting sequencing in PRACH time slots；TGPIt indicates
The duration of GP in PRACH time slots；N indicates that the positive integer of different value can be taken；
The configuration module is further used for, and preserves the random access probability that single ultra-large type community user is initiated in the unit interval
Number, the random access probability number that single ultra-large type community user is initiated in the unit interval are according to ultra-large type cell
Radius of society and cell average user number are calculated；
The random access module is further used for, in addition to according to the subframe position information of PRACH time slots, itself configuration
Except PRACH minislot parameters, while the random access probability number initiated according to single ultra-large type community user in the unit interval,
In corresponding subframe position random access is initiated to target eNodeB.
6. UE according to claim 5, which is characterized in that single ultra-large type is small in the unit interval in the configuration module
Area's Client-initiated random access probability number is obtained according to following formula：
Wherein, NRAFor the random access probability number that single ultra-large type community user is initiated in the unit time；R is ultra-large type cell
Radius；M is ultra-large type cell average user number, can be empirically determined；P be in ultra-large type cell everyone initiate per hour it is flat
Equal random access number, can be empirically determined；D is the average distance of arbitrary two terminal room in ultra-large type cell, can be rule of thumb
It determines.
7. UE according to claim 5, which is characterized in that the system that the random access module is sent by source eNodeB
Block of information SIB2 or mobile control informational messages obtain the subframe position of the PRACH time slots of target eNodeB.
8. a kind of LTE system, which is characterized in that including：
UE：The PRACH minislot parameters of ultra-large type cell are preserved, the PRACH minislot parameters of the ultra-large type cell are according to super large
The radius of society and maximum delay expanding value of type cell are calculated；When to be switched to target ultra-large type from cell-of-origin small by this UE
Qu Shi obtains the subframe position of the PRACH time slots of target eNodeB from source eNodeB, according to the subframe position of PRACH time slots,
PRACH minislot parameters initiate random access, the PRACH of the ultra-large type cell in corresponding subframe position to target eNodeB
Minislot parameter is calculated according to following formula：
Wherein, TCPIndicate the duration of CP in PRACH time slots；R indicates radius of society；C indicates the light velocity；DSmaxIndicate the maximum of cell
Delay spread value, for ultra-large type cell, DSmax>5.2μs；TSEQIndicate the duration of targeting sequencing in PRACH time slots；TGPIt indicates
The duration of GP in PRACH time slots；N indicates that the positive integer of different value can be taken；
eNodeB：The PRACH minislot parameters of ultra-large type cell are preserved, random access watch window information are preserved, in watch window
The random access leader sequence that interior reception UE is sent, wherein the length of random access watch window is true according to PRACH minislot parameters
It is fixed；
The UE is further used for, and preserves the random access probability number that single ultra-large type community user is initiated in the unit interval,
The random access probability number that single ultra-large type community user is initiated in the unit interval is the cell according to ultra-large type cell
Radius and cell average user number are calculated, and, in addition to according to the subframe position information of PRACH time slots, itself configuration
Except PRACH minislot parameters, while the random access probability number initiated according to single ultra-large type community user in the unit interval,
In corresponding subframe position random access is initiated to target eNodeB.
9. LTE system according to claim 8, which is characterized in that the eNodeB further comprises：Cell hand-off process
Module, for when receive that UE sends for a ultra-large type cell cell switching request when, by the PRACH of target eNodeB
The subframe position information of time slot is carried is sent to UE in SIB2 or mobile control informational messages.
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| CN101755478A (en) * | 2007-08-10 | 2010-06-23 | 松下电器产业株式会社 | Terminal device and base station device |
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