CN106937400A - A kind of accidental access method, base station and user equipment - Google Patents
A kind of accidental access method, base station and user equipment Download PDFInfo
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- CN106937400A CN106937400A CN201511019645.0A CN201511019645A CN106937400A CN 106937400 A CN106937400 A CN 106937400A CN 201511019645 A CN201511019645 A CN 201511019645A CN 106937400 A CN106937400 A CN 106937400A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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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
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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Abstract
The invention discloses a kind of accidental access method, base station and user equipment, the method includes：Base station judges currently to whether there is co-channel interference；If there is co-channel interference, then the base station sends the system message for carrying interference targeting sequencing form to the user equipment (UE) under the base station, the time-domain resource that the interference targeting sequencing form is used to indicating the Physical Random Access Channel PRACH of UE to take be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, the base station receives the lead code for carrying out Stochastic accessing of UE transmissions in the time-domain resource that the leading form of interference is indicated；If the base station correctly demodulates the lead code, accidental access response is sent to the UE, be used to solve when co-channel interference is met with, existing PRACH targeting sequencings form causes the UE of UE access failures, whole communication system to be successfully accessed rate reduction.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of accidental access method, base station and user equipment.
Background technology
Present mobile communication is increasingly intended to provide the multimedia service of high rate data transmission, in LTE (Long Term
Evolution, Long Term Evolution) in system, (Physical Random Access Channel, physical accidental accesses letter to PRACH
Road) it is that uplink random accesses channel, UE (User Equipment, user equipment) receives FPACH (Fast Physical
Access Channel, physical access channel) after response message, the information that can be indicated according to base station is sent out in PRACH channels
RRC (Radio Resource Control, radio resource control) message is sent, RRC establishment of connections are carried out.
In 3GPP R8 (third generation partner program) specification, LTE system in collocating uplink PRACH channels, for
LTE_FDD and TD_LTE, devises various Preamble format (targeting sequencing form), to meet different MPS process
Radius demand.Wherein Preamble Format Types 0,1,2,3 (Preamble format 0,1,2,3) are LTE_FDD and TD_
LTE is general, and is directed to the special frame structures of TD_LTE, devises Preamble Format Types 4 (Preamble format 4),
Focus covering for radius of society when smaller.But when co-channel interference is met with, existing PRACH channel leadings Format Series Lines
Can cause that the random code that UE sends on PRACH channels cannot be detected and be resolved in base station, ultimately causing UE cannot be successfully accessed
Communication system, causes the UE of whole communication system to be successfully accessed rate reduction.
Therefore, when co-channel interference is met with, existing PRACH channel leadings Format Series Lines causes UE access failures, entirely
The UE of communication system is successfully accessed rate reduction.
The content of the invention
The embodiment of the present invention provides a kind of accidental access method, base station and user equipment, is used to solve when experience is dry with frequency
When disturbing, existing PRACH targeting sequencings form causes the UE of UE access failures, whole communication system to be successfully accessed rate reduction.
The inventive method includes a kind of accidental access method, and the method includes：Base station judges current with the presence or absence of dry with frequency
Disturb；If there is co-channel interference, the base station sends to the user equipment (UE) under the base station and carries interference targeting sequencing form
System message, during the interference targeting sequencing form is used to indicating the time-domain resource that the PRACH of UE takes to be a radio frames
At least first i-th symbol of sub-frame of uplink of each field to the i-th+n symbols, wherein, the uplink interference electricity of i-th symbol
Level values are less than first threshold, and n is no more than 14 positive integer；The time-domain resource that the base station indicates in the leading form of interference
The lead code for carrying out Stochastic accessing that upper reception UE sends；If the base station correctly demodulates the lead code, to described
UE sends accidental access response.
From user equipment side, the embodiment of the present invention further provides a kind of accidental access method, and the method includes：UE connects
The system message of the carrying leading form of interference that base station sends is received, the interference targeting sequencing form is used to indicate the PRACH of UE
The time-domain resource of occupancy is that at least first i-th symbol of sub-frame of uplink of each field in a radio frames is accorded with to the i-th+n
Number, wherein, i-th uplink interference level value of symbol is less than first threshold, and n is no more than 14 positive integer；The UE is in institute
The lead code sent in PRACH resources for carrying out Stochastic accessing is stated, so that base station solves according to the lead code of each UE to correct
The corresponding UE of lead code of tune sends accidental access response.
Based on same inventive concept, a kind of base station of the embodiment of the present invention, the base station includes：Judging unit, for judging
Currently whether there is co-channel interference；System message unit is sent, if for there is co-channel interference, being sent out to the UE under the base station
The system message for carrying the leading form of interference is sent, the interference targeting sequencing form is used for the time domain for indicating the PRACH of UE to take
Resource be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, wherein, i-th
The uplink interference level value of individual symbol is less than first threshold, and n is no more than 14 positive integer；Receiving unit, for described dry
Disturb and received in the time-domain resource that leading form is indicated the lead code for carrying out Stochastic accessing that UE sends；Stochastic accessing is sent to ring
Unit is answered, if for correctly demodulating the lead code, accidental access response is sent to the UE.
Further, the embodiment of the present invention provides a kind of user equipment, and the equipment includes：Receiving unit, for receiving base
The system message of leading form is disturbed in the carrying for sending of standing, and the interference targeting sequencing form is used to indicate the PRACH of UE to take
Time-domain resource be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, its
In, i-th uplink interference level value of symbol is less than first threshold, and n is no more than 14 positive integer；Transmitting element, for
The lead code for carrying out Stochastic accessing is sent in the PRACH resources, so as to base station according to the lead code of each UE to correct
The corresponding UE of lead code of demodulation sends accidental access response.
Embodiment of the present invention one side base station judges currently to whether there is co-channel interference, if there is co-channel interference, to base
User equipment (UE) under standing sends the system message for carrying interference targeting sequencing form, disturbs the leading form to be in the system message
Base station and terminal are made an appointment the targeting sequencing form for using, and are the time domain money that PRACH takes the characteristics of the targeting sequencing form
Source is at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, and i-th
The uplink interference level value of symbol is less than first threshold；On the other hand, UE is about being set on the PRACH of interference targeting sequencing form
Lead code is sent, after base station receives the correct demodulation of lead code completion, accidental access response is sent to UE.It can be seen that, when UE is using this
The PRACH of the interference targeting sequencing form in inventive embodiments definition sends lead code and is accessed, and can improve dry with frequency
In the case of disturbing, the access performance for being successfully accessed rate, lifting whole system of UE.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these accompanying drawings
His accompanying drawing.
Fig. 1 is the random access leader sequence on a kind of prior art is provided PRACH channels；
Fig. 2 for prior art is provided a kind of Preamble Format Types be 4 when PRACH in time-domain resource position；
Fig. 3 for prior art is provided a kind of Preamble Format Types be 0 when PRACH in time-domain resource position；
The interference level value of the symbol that Fig. 4 takes for PRACH under a kind of prior art is provided co-channel interference in time-domain resource；
A kind of Fig. 5 corresponding interference targeting sequencing format approach schematic flow sheets of base station side for the embodiment of the present invention is provided；
Fig. 6 is a kind of for the embodiment of the present invention is provided to disturb the corresponding PRACH of targeting sequencing form in time-domain resource position；
Fig. 7 for the embodiment of the present invention is provided, illustrate by a kind of corresponding interference targeting sequencing format approach flow of user equipment side
Figure；
A kind of Fig. 8 base station schematic diagrames for the embodiment of the present invention is provided；
A kind of Fig. 9 user equipment schematic diagrames for the embodiment of the present invention is provided.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
One step ground is described in detail, it is clear that described embodiment is only some embodiments of the invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
Various aspects are described herein in connection with UE and/or base station.UE, refers to and provides a user with voice and/or data communication
The equipment (device) of property, including wireless UE or wired UE.Wireless UE can be the portable equipment with wireless connecting function,
Or other processing equipments of radio modem are connected to, communicated with one or more core nets through wireless access network
Mobile UE.For example, wireless UE can be mobile phone (or being " honeycomb " phone) and the computer with mobile UE.And for example,
Wireless UE can also be portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device.For another example, wireless UE
It can be a part for movement station, access point or user equipment (user equipment, UE).
It should be noted that PRACH be used as Stochastic accessing, be user initially connected, switched, connection re-establishment, weight
The new approach for recovering uplink synchronous.UE reaches multi-upstream access between communication system and synchronous by PRACH.
UE is accessed using the random access leader sequence on PRACH channels, and the random access leader sequence is ZC sequences,
Its expression formula is：
xu,v(n)=xu((n+Cv)mod Nzc) ... ... ... formula 1
Wherein, CvFor rotation bit is transplanted, NzcIt is cycle period,0≤n≤Nzc- 1, u are root sequence
Loop index.
Random access leader sequence on PRACH channels, is T comprising lengthcpCyclic Prefix (CP) and length be TSEQ's
Sequence, as shown in figure 1, existing targeting sequencing form design parameter is as shown in table l.
Table 1：
| Targeting sequencing form | Tcp | TSEQ |
| Format 0 | 3168Ts | 24576Ts |
| Format 1 | 21024TS | 24576TS |
| Format 2 | 6240Ts | 59152Ts |
| Format 3 | 21024Ts | 59152Ts |
| format 4 | 448Ts | 4096Ts |
Wherein, Preamble format 0：Continue 1ms, sequence length 800us, it is adaptable to small, medium-sized cell, it is maximum
Radius of society 14.53km, this form meets most scenes of the network coverage；Preamble format1：Continue 2ms, sequence is long
Degree 800us, it is adaptable to large-scale cell, largest cell radius is 77.34km；Preamble format 2：Continue 2ms, sequence
Length 1600us, it is adaptable to medium-sized plot, largest cell radius is 29.53km；Preamble format 3：Continue 3ms, sequence
Row length 1600us, it is adaptable to ultra-large type cell, largest cell radius is 100.16km；It is generally used for the needs such as sea, isolated island
The scene of extra long distance covering；Preamble format 4：The special form of tdd mode, 157.292 μ s of duration (2
The burst of OFDM symbol), it is adaptable to small cell, radius of society≤1.4km, short distance covering is generally used for, it is particularly close
The scenes such as collection urban district, in-door covering or focus supplement covering.
In sum, the various lower maximum radius for supporting cell of existing preamble format are as shown in table 2.
Table 2：
In existing TD-LTE system, in network planning ascending-descending subframes allocation ratio, it is necessary to selected according to switching cycle
Suitable configuration.The sub-frame configuration of one radio frames of TD-LTE system supports following 7 kinds of DL：UL matches mode, is shown in Table 3：
From table 3：Pattern 0：1 radio frames includes 2 descending sub frames, 6 sub-frame of uplink and 2 special subframes；
Pattern 1：1 radio frames includes 4 descending sub frames, 4 sub-frame of uplink and 2 special subframes；Pattern 2：Wrapped in 1 radio frames
Include 6 descending sub frames, 2 sub-frame of uplink and 2 special subframes；Pattern 3：1 radio frames include 6 descending sub frames, on 3
Row subframe and 1 special subframe；Pattern 4：1 radio frames includes 7 descending sub frames, 2 sub-frame of uplink and 1 special son
Frame；Pattern 5：1 radio frames includes 8 descending sub frames, 1 sub-frame of uplink and 1 special subframe；Pattern 6：1 radio frames
Include 3 descending sub frames, 5 sub-frame of uplink and 2 special subframes.
It is 4 or Preamble Format Types 0 that existing TD-LTE system generally uses Preamble Format Types.When adopting
With preamble format be 4 when, PRACH is taken on frequency domain centre 1.08MHz bandwidth (72 subcarriers), accounted in time domain
With 2 symbols of uppts, as shown in Figure 2.
When using preamble format for 0, PRACH takes middle 1.08MHz bandwidth on frequency domain, and (72 sons are carried
Ripple), first 14 symbols altogether of sub-frame of uplink is taken in time domain, as shown in Figure 3.
But when co-channel interference is met with, the corresponding PRACH of two kinds of Preamble Format Types of prior art can be received
To interference, specific disturbed condition is as shown in figure 4, TD-LTE networks slightly receive dry in only Up of daily period and up first symbol
Disturb, but interference level is overall all in below -110dBm, it is little on network performance influence；And when experience remote co-channel interference
When, until uplink symbol symbol 7 is just down to below -105dBm, UpPTS_symbol 1, UpPTS_symbol 2 and UL_
Symbol 1 to UL_symbol 6 suffers from different degrees of interference, and interference level intensity tapers off trend from front to back.
Therefore, by test statistics data, it is set in the case of 4 in preamble format, the two of UpPTS
Strong jamming is suffered from individual symbols；It is set in the case of 0 in preamble format, first 6 of UP subframe
Symbols suffers from strong jamming, has a strong impact on wireless access performance, and influence LTE user perceives.
In order to solve the influence that co-channel interference is caused, the embodiment of the present invention provides a kind of interference targeting sequencing form, is based on
The targeting sequencing form realizes Stochastic accessing, specifically, shown in Figure 5, and the embodiment of the present invention provides a kind of Stochastic accessing side
Method schematic flow sheet, specifically implementation method include：
Step S101, base station judges currently to whether there is co-channel interference.
Step S102, if there is co-channel interference, the base station sends to the UE under the base station and carries the leading sequence of interference
The system message of column format, the time-domain resource that the interference targeting sequencing form is used to indicate the PRACH of UE to take is a nothing
At least first i-th symbol of sub-frame of uplink of each field be to the i-th+n symbols in line frame, wherein, i-th symbol it is up
Interference level value is less than first threshold, and n is no more than 14 positive integer.
Step S103, what the base station received that UE sends in the time-domain resource that the leading form of the interference is indicated be used for into
The lead code of row Stochastic accessing.
Step S104, if the base station correctly demodulates the lead code, accidental access response is sent to the UE.
When being subjected to co-channel interference in view of base station, the interference level value that network side is collected into can change, and therefore, it can
Whether base station is judged in the state of co-channel interference by the interference level value of network side, specifically, the base station obtains one
Each symbol distinguishes corresponding uplink interference level value in the set of symbols of each subframe in individual radio frames；
For a sub-frame of uplink in a radio frames, the base station is by each symbol in the set of symbols of the sub-frame of uplink
Number uplink interference level value corresponding respectively is made comparisons with the first threshold, if continuous m symbol difference is corresponding up doing
Level value is disturbed more than the first threshold, then judges that the base station has co-channel interference, m is no more than 14 positive integer；
Or,
For a special subframe in a radio frames, the base station is by uplink pilot time slot in the special subframe
Symbol respectively with first threshold make comparisons by corresponding uplink interference level value, if in the special subframe uplink pilot time slot symbol
Number corresponding uplink interference level value of difference is more than the first threshold, then judge that the base station has co-channel interference.
For example, when base station uses the up PRACH channels that Preamble Format Types are 4, then when experience is with frequency
During interference, 2 symbols that PRACH takes uppts in time domain suffer from strong jamming, and uplink interference level value is all higher than-
110dBm, therefore may determine that now base station is in co-channel interference state；In addition, when base station uses Preamble Format Types
It is 0 up PRACH channels, then when co-channel interference is met with, first sub-frame of uplink of occupancy has 14 altogether in PRACH time domains
Individual symbol (symbols), preceding 6 symbols suffer from strong jamming, and the uplink interference level value of preceding 6 symbols is all higher than-
110dBm, therefore may determine that now base station is in co-channel interference state.Certainly, there are other co-channel interferences and judge in prior art
Mode is equally applicable, and will not be repeated here.
When co-channel interference state is judged to be now in base station, it is necessary to pass through to adjust occupancy positions of the PRACH in time domain
Put, to solve the influence that co-channel interference is brought, specifically, settling mode is the present invention by setting new targeting sequencing form
Embodiment is defined as disturbing targeting sequencing form, and the interference targeting sequencing form is T comprising lengthcpCyclic Prefix (CP) and
Length is TSEQSequence, wherein Tcp be 15456Ts, TSEQIt is 12288Ts.
In TD-LTE system, the interference targeting sequencing form indicates the Physical Random Access Channel PRACH of the UE
The time-domain resource of occupancy be each field in a radio frames first the 7th of sub-frame of uplink the symbol to the 14th symbol
Number, wherein, the time-domain resource that PRACH takes is as shown in Figure 6.In this mode, the co-channel interference without considering each symbol in real time,
But the interference targeting sequencing form arranged by base station and UE, can be in the case where co-channel interference be avoided, it is further provided
The efficiency of system.
Because in TD-LTE system, the pattern 2 of the sub-frame configuration use of one radio frames of TD-LTE system, and pattern 2
Include：1 radio frames includes 6 descending sub frames, 2 sub-frame of uplink and 2 special subframes.Used based on TD-LTE system
Pattern 2 in subframe the characteristics of, in each field include a sub-frame of uplink, when meet with co-channel interference when, TD-LTE system one
In individual radio frames in the sub-frame of uplink of each field, preceding 6 symbols are interfered, afterwards 8 interference level values of symbol-
Below 110dBm, therefore adjust first sub-frame of uplink that the time-domain resource of PRACH occupancy is each field in a radio frames
The 7th symbol to the 14th symbol, can effectively reduce the interference level intensity of PRACH channels.
If in addition, in TD-LTE system, the pattern 1 that the sub-frame configuration of one radio frames of TD-LTE system is used, and mould
Formula 1 includes：1 radio frames includes 4 descending sub frames, 4 sub-frame of uplink and 2 special subframes.Based on TD-LTE system
In the pattern 1 of use the characteristics of subframe, two sub-frame of uplink are included in each field, when co-channel interference is met with, TD-LTE systems
In unified radio frames in the sub-frame of uplink of each field, preceding 6 symbols are interfered, afterwards 8 interference level values of symbol-
Below 110dBm, therefore adjust first sub-frame of uplink that the time-domain resource of PRACH occupancy is each field in a radio frames
With second the 7th of sub-frame of uplink the symbol to the 14th symbol, the interference level that can effectively reduce PRACH channels is strong
Degree.
After interference targeting sequencing form is determined, base station side and UE sides are given tacit consent to this kind and disturb leading by protocol conventions
The PRACH resources of Format Series Lines.Because the PRACH resources of above-mentioned setting form are base station and UE both sides' agreement, then UE is in hair
Rise in random access procedure, directly can be randomly choosed from the PRACH resources of the specific format of agreement, and in the PRACH of selection
Lead code is sent in resource.The random access procedure of UE is, shown in Figure 7, and specifically implementation method includes：
Step S201, UE receive the system message of the carrying leading form of interference that base station sends, the interference targeting sequencing
The time-domain resource that form is used to indicating the Physical Random Access Channel PRACH of UE to take is that each field is extremely in a radio frames
Lack first i-th symbol of sub-frame of uplink to the i-th+n symbols, wherein, i-th uplink interference level value of symbol is less than first
Threshold value, n is no more than 14 positive integer.
Step S202, the UE send the lead code for carrying out Stochastic accessing in the PRACH resources, so as to base station
Lead code according to each UE sends accidental access response to the corresponding UE of lead code of correct demodulation.
After UE sends lead code by the accidental access method of the embodiment of the present invention, base station can be UE configurations at it
PRACH resources on demodulate the lead code for detecting that each UE sends, and the corresponding UE of lead code to correct demodulation sends random
Access response (RAResponse, RAR).Wherein, base station needs the PRACH Resource Calculations RA- used according to the lead code
RNTI (mark temporarily by random access-Radio Network Temporary Identifier, Stochastic accessing-wireless network
Know), and CRC (Cyclic Redundancy Check, CRC) school is carried out to PDCCH using the RA-RNTI
Test, then send the accidental access response, specific transmission process and prior art phase on the PDSCH of PDCCH scheduling
Together, will not be repeated here.
By the method for the embodiment of the present invention, UE is interference targeting sequencing form in the specific format that base station is its configuration
Lead code is sent in PRACH resources, is solved under co-channel interference, UE accesses difficult problem, that improves UE is successfully accessed rate,
Lift the access performance of whole system.
Based on identical technology design, the embodiment of the present invention also provides a kind of base station, the executable above method reality in the base station
Apply example.Base station provided in an embodiment of the present invention as shown in figure 8, including：Judging unit 301, sends system message unit 302, connects
Unit 303 is received, accidental access response unit 304 is sent, wherein：
Judging unit 301, for judging currently to whether there is co-channel interference；
System message unit 302 is sent, if for there is co-channel interference, being sent to the UE under the base station and carrying interference
The system message of leading form, the interference targeting sequencing form is used to indicate the Physical Random Access Channel PRACH of UE to take
Time-domain resource be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, its
In, i-th uplink interference level value of symbol is less than first threshold, and n is no more than 14 positive integer；
Receiving unit 303, for being used for of receiving that UE sends in the time-domain resource that the leading form of the interference is indicated into
The lead code of row Stochastic accessing；
Accidental access response unit 304 is sent, if for correctly demodulating the lead code, sent to the UE and connect at random
Enter response.
When being subjected to co-channel interference in view of base station, the interference level value that network side is collected into can change, and therefore, it can
Judge whether base station is in the state of co-channel interference by the interference level value of network side, specifically, the judging unit 301
Specifically for：
Each symbol distinguishes corresponding uplink interference level value in obtaining the set of symbols of each subframe in a radio frames；
It is for a sub-frame of uplink in a radio frames, each symbol in the set of symbols of the sub-frame of uplink is right respectively
The uplink interference level value answered is made comparisons with the first threshold, if continuous m symbol distinguishes corresponding uplink interference level value
More than the first threshold, then judge that the base station has co-channel interference, m is no more than 14 positive integer；
Or,
For a special subframe in a radio frames, by the symbol difference of uplink pilot time slot in the special subframe
Corresponding uplink interference level value is made comparisons with first threshold, if the symbol of uplink pilot time slot is right respectively in the special subframe
The uplink interference level value answered is more than the first threshold, then judge that the base station has co-channel interference.
The interference targeting sequencing form indicates the time-domain resource that the Physical Random Access Channel PRACH of the UE takes to be
The 7th symbol of first sub-frame of uplink of each field is to the 14th symbol in one radio frames.
For example, when base station uses the up PRACH channels that Preamble Format Types are 4, then when experience is with frequency
During interference, 2 symbols that PRACH takes uppts in time domain suffer from strong jamming, and uplink interference level value is all higher than-
110dBm, therefore may determine that now base station is in co-channel interference state；In addition, when base station uses Preamble Format Types
It is 0 up PRACH channels, then when co-channel interference is met with, first sub-frame of uplink of occupancy has 14 altogether in PRACH time domains
Individual symbol (symbols), preceding 7 symbols suffer from strong jamming, and the uplink interference level value of preceding 7 symbols is all higher than-
110dBm, therefore may determine that now base station is in co-channel interference state.Certainly, there are other co-channel interferences and judge in prior art
Mode is equally applicable, and will not be repeated here.
When co-channel interference state is judged to be now in base station, it is necessary to pass through to adjust occupancy positions of the PRACH in time domain
Put, to solve the influence that co-channel interference is brought, specifically, settling mode is the present invention by setting new targeting sequencing form
Embodiment is defined as disturbing targeting sequencing form, and the interference targeting sequencing form is T comprising lengthcpCyclic Prefix (CP) and
Length is TSEQSequence, wherein Tcp be 15456Ts, TSEQIt is 12288Ts.
In TD-LTE system, the interference targeting sequencing form indicates the Physical Random Access Channel PRACH of the UE
The time-domain resource of occupancy be each field in a radio frames first the 7th of sub-frame of uplink the symbol to the 14th symbol
Number, wherein, the time-domain resource that PRACH takes is as shown in Figure 6.
Because in TD-LTE system, the pattern 2 of the sub-frame configuration use of one radio frames of TD-LTE system, and pattern 2
Include：1 radio frames includes 6 descending sub frames, 2 sub-frame of uplink and 2 special subframes.Used based on TD-LTE system
Pattern 2 in subframe the characteristics of, in each field include a sub-frame of uplink, when meet with co-channel interference when, TD-LTE system one
In individual radio frames in the sub-frame of uplink of each field, preceding 7 symbols are interfered, afterwards 7 interference level values of symbol-
Below 110dBm, therefore adjust first sub-frame of uplink that the time-domain resource of PRACH occupancy is each field in a radio frames
The 7th symbol to the 14th symbol, can effectively reduce the interference level intensity of PRACH channels.
If in addition, in TD-LTE system, the pattern 1 that the sub-frame configuration of one radio frames of TD-LTE system is used, and mould
Formula 1 includes：1 radio frames includes 4 descending sub frames, 4 sub-frame of uplink and 2 special subframes.Based on TD-LTE system
In the pattern 1 of use the characteristics of subframe, two sub-frame of uplink are included in each field, when co-channel interference is met with, TD-LTE
In one radio frames of system in the sub-frame of uplink of each field, preceding 7 symbols are interfered, afterwards 7 interference level values of symbol
Below -110dBm, therefore adjust first up son that the time-domain resource of PRACH occupancy is each field in a radio frames
Frame and second the 7th of sub-frame of uplink the symbol are to the 14th symbol, and the interference level that can effectively reduce PRACH channels is strong
Degree.
After interference targeting sequencing form is determined, base station side and UE sides are given tacit consent to this kind and disturb leading by protocol conventions
The PRACH resources of Format Series Lines.Because the PRACH resources of above-mentioned setting form are base station and UE both sides' agreement, then UE is in hair
Rise in random access procedure, directly can be randomly choosed from the PRACH resources of the specific format of agreement, and in the PRACH of selection
Lead code is sent in resource.The present invention implements also to provide a kind of user equipment (UE), and referring to Fig. 9, the equipment includes：Receiving unit
401, transmitting element 402, wherein：
Receiving unit 401, the system message of the carrying leading form of interference for receiving base station transmission, the interference is leading
The time-domain resource that Format Series Lines is used to indicate the Physical Random Access Channel PRACH of UE to take is each field in a radio frames
At least first i-th symbol of sub-frame of uplink to the i-th+n symbols, wherein, the uplink interference level value of i-th symbol is less than
First threshold, n is no more than 14 positive integer；
Transmitting element 402, for sending the lead code for carrying out Stochastic accessing in the PRACH resources, so as to base
Stand and send accidental access response to the corresponding UE of lead code of correct demodulation according to the lead code of each UE.
After UE sends lead code by the accidental access method of the embodiment of the present invention, base station can be UE configurations at it
PRACH resources on demodulate the lead code for detecting that each UE sends, and the corresponding UE of lead code to correct demodulation sends random
Access response (RA Response, RAR).Wherein, base station needs the PRACH Resource Calculations RA- used according to the lead code
RNTI (mark temporarily by random access-Radio Network Temporary Identifier, Stochastic accessing-wireless network
Know), and CRC check is carried out to PDCCH using the RA-RNTI, then send described random on the PDSCH of PDCCH scheduling
Response is accessed, specific transmission process is same as the prior art, will not be repeated here.
In sum, embodiment of the present invention one side base station judges currently to whether there is co-channel interference, if in the presence of dry with frequency
Disturb, then the system message for carrying interference targeting sequencing form is sent to the user equipment (UE) under base station, disturbed in the system message
Leading form is that base station and terminal are made an appointment the targeting sequencing form for using, and is that PRACH is accounted for the characteristics of the targeting sequencing form
Time-domain resource be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols,
And the i-th uplink interference level value of symbol is less than first threshold；On the other hand, UE is about being set to interference targeting sequencing lattice
Lead code is sent on the PRACH of formula, after base station receives the correct demodulation of lead code completion, accidental access response is sent to UE.It can be seen that,
The PRACH of the interference targeting sequencing form in UE is defined using the embodiment of the present invention sends lead code and is accessed, Ke Yiti
In the case of co-channel interference, UE's is successfully accessed rate, the access performance of lifting whole system to height.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (10)
1. a kind of accidental access method, it is characterised in that the method includes：
Base station judges currently to whether there is co-channel interference；
If there is co-channel interference, the base station sends to the user equipment (UE) under the base station and carries interference targeting sequencing form
System message, the interference targeting sequencing form is used to indicate the time domain money that the Physical Random Access Channel PRACH of UE takes
Source be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, wherein, i-th
The uplink interference level value of symbol is less than first threshold, and n is no more than 14 positive integer；
The base station receive that UE sends in the time-domain resource that the leading form of the interference is indicated for carrying out Stochastic accessing
Lead code；
If the base station correctly demodulates the lead code, accidental access response is sent to the UE.
2. the method for claim 1, it is characterised in that the interference targeting sequencing form indicate the physics of the UE with
The time-domain resource that machine accesses channel PRACH occupancy is first the 7th of sub-frame of uplink the symbol of each field in a radio frames
Number to the 14th symbol.
3. method as claimed in claim 2, it is characterised in that the base station judges currently to whether there is co-channel interference, including：
Each symbol distinguishes corresponding uplink interference level in the set of symbols of each subframe in one radio frames of the base station acquisition
Value；
For a sub-frame of uplink in a radio frames, each symbol in the set of symbols of the sub-frame of uplink is divided in the base station
Not corresponding uplink interference level value is made comparisons with the first threshold, if continuous m symbol distinguishes corresponding uplink interference electricity
Level values are more than the first threshold, then judge that the base station has co-channel interference, and m is no more than 14 positive integer；
Or,
For a special subframe in a radio frames, the base station is by the symbol of uplink pilot time slot in the special subframe
Corresponding uplink interference level value is made comparisons with first threshold respectively, if the symbol of uplink pilot time slot divides in the special subframe
Not corresponding uplink interference level value is more than the first threshold, then judge that the base station has co-channel interference.
4. the method for claim 1, it is characterised in that the PRACH resources include cyclic prefix CP and leading sequence
Row code, wherein, the radius of society that the CP is covered according to the base station determines.
5. a kind of accidental access method, it is characterised in that the method includes：
UE receives the system message of the carrying leading form of interference that base station sends, and the interference targeting sequencing form is used to indicate UE
Physical Random Access Channel PRACH take time-domain resource be each field in a radio frames at least first up son
I-th symbol of frame to the i-th+n symbols, wherein, i-th uplink interference level value of symbol is less than first threshold, and n is to be not more than
14 positive integer；
The UE sends the lead code for carrying out Stochastic accessing in the PRACH resources, so that base station is according to each UE's
Lead code sends accidental access response to the corresponding UE of lead code of correct demodulation.
6. a kind of base station, it is characterised in that the base station includes：
Judging unit, for judging currently to whether there is co-channel interference；
System message unit is sent, if for there is co-channel interference, being sent to the UE under the base station and carrying the leading lattice of interference
The system message of formula, the interference targeting sequencing form is used for the time domain for indicating the Physical Random Access Channel PRACH of UE to take
Resource be at least first i-th symbol of sub-frame of uplink of each field in a radio frames to the i-th+n symbols, wherein, i-th
The uplink interference level value of individual symbol is less than first threshold, and n is no more than 14 positive integer；
Receiving unit, for the reception UE transmissions in the time-domain resource that the leading form of interference is indicated for being connect at random
The lead code for entering；
Accidental access response unit is sent, if for correctly demodulating the lead code, accidental access response is sent to the UE.
7. base station as claimed in claim 6, it is characterised in that the interference targeting sequencing form indicate the physics of the UE with
The time-domain resource that machine accesses channel PRACH occupancy is first the 7th of sub-frame of uplink the symbol of each field in a radio frames
Number to the 14th symbol.
8. base station as claimed in claim 6, it is characterised in that the judging unit specifically for：
Each symbol distinguishes corresponding uplink interference level value in obtaining the set of symbols of each subframe in a radio frames；
It is for a sub-frame of uplink in a radio frames, each symbol difference in the set of symbols of the sub-frame of uplink is corresponding
Uplink interference level value is made comparisons with the first threshold, if continuous m symbol is distinguished corresponding uplink interference level value and be more than
The first threshold, then judge that the base station has co-channel interference, and m is no more than 14 positive integer；
Or,
For a special subframe in a radio frames, the symbol of uplink pilot time slot in the special subframe is corresponded to respectively
Uplink interference level value made comparisons with first threshold, if in the special subframe uplink pilot time slot symbol difference it is corresponding
Uplink interference level value is more than the first threshold, then judge that the base station has co-channel interference.
9. base station as claimed in claim 6, it is characterised in that the PRACH resources include cyclic prefix CP and leading sequence
Row code, wherein, the radius of society that the CP is covered according to the base station determines.
10. a kind of user equipment (UE), it is characterised in that the equipment includes：
Receiving unit, the system message of the carrying leading form of interference for receiving base station transmission, the interference targeting sequencing lattice
The time-domain resource that formula is used to indicating the Physical Random Access Channel PRACH of UE to take is that each field is at least in a radio frames
First i-th symbol of sub-frame of uplink to the i-th+n symbols, wherein, i-th uplink interference level value of symbol is less than the first threshold
Value, n is no more than 14 positive integer；
Transmitting element, for sending the lead code for carrying out Stochastic accessing in the PRACH resources, so that base station is according to each
The lead code of individual UE sends accidental access response to the corresponding UE of lead code of correct demodulation.
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| CN111937477B (en) * | 2018-05-11 | 2022-05-13 | 华为技术有限公司 | Method and device for transmitting random access lead code |
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| CN114615683B (en) * | 2020-12-08 | 2023-08-15 | 中国移动通信集团山西有限公司 | Method, device, equipment and storage medium for optimizing random access |
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