CN108882388A - A kind of accidental access method and base station - Google Patents
A kind of accidental access method and base station Download PDFInfo
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- CN108882388A CN108882388A CN201710326082.2A CN201710326082A CN108882388A CN 108882388 A CN108882388 A CN 108882388A CN 201710326082 A CN201710326082 A CN 201710326082A CN 108882388 A CN108882388 A CN 108882388A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The embodiment of the invention provides a kind of accidental access method and base stations, to realize terminal Network with Random Multiple Access System.This method includes：Base station receives the random access lead code that terminal is sent；Base station random access lead code and the random access preamble set pre-saved based on the received, obtain falling in the parameter of the relevant peaks at least one zero correlation window in each zero correlation window, the random access lead code and zero correlation window that random access preamble set includes correspond, and the parameter of relevant peaks includes the power and/or Timing Advance of random access lead code；When there is the parameter for the relevant peaks for meeting preset condition in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, the accidental access response message of the parameter including the relevant peaks for meeting preset condition is sent to terminal by base station.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of accidental access method and base stations.
Background technique
Random access is the necessary process that Radio Link is established between terminal and network, and terminal random access is completed later
Energy and base station communication.
During random access, terminal, which is determined according to the configuration parameter that base station issues to the base station, sends random access
At the time of lead code (Random Access Preamble, Preamble), and before the moment sends random access to base station
Leading code, random access lead code are displaced by random access preamble (Zadoff-Chu) sequence.Base station receives terminal
According in the random access lead code and the random access preamble set pre-saved after the random access lead code of transmission
Each Zadoff-Chu sequence obtain falling in the relevant peaks in zero correlation window.Due to the mark of zero correlation window and random access lead code
Know (PreambleIdentification, Preamble ID) to correspond, therefore base station passes through zero determined where relevant peaks
Associated window is assured that the mark for the corresponding random access lead code of random access lead code that terminal is sent.It base station can be by phase
The parameter of Guan Feng and the mark of random access lead code are sent to terminal by accidental access response message.
In the technical solution of existing random access, random access preamble is sent since terminal shifts to an earlier date or delays to base station
Code is likely to result in the relevant peaks that base station obtains and falls in the zero correlation window of mistake, or since what base station received connects at random
Enter lead code and energy leakage occurs, will cause the relevant peaks that base station obtains and fall in multiple zero correlation windows, both of which
It may cause the parameter identified with the relevant peaks of mistake that base station determines the random access lead code of mistake, so that terminal is according to base
The random access response sent of standing can not carry out uplink synchronous, and the random access response that base station is sent at this time connects at random for invalid
Enter response, in turn resulted in the when extension of random access, random access failure rate is high.Interference noise may be mistaken for by base station
Random access lead code, and random access response is sent according to the random access lead code of erroneous judgement, base station is sent random at this time
Access response is invalid random access response, wastes the resource of base station, has slowed down the speed of service of base station.
To sum up, there are extension when random access, random access failure rate height, base station in existing radio access technology scheme
The problems such as wasting of resources and the slow speed of service, therefore urgently design a kind of technical side for realizing terminal Network with Random Multiple Access System
Case.
Summary of the invention
The embodiment of the invention provides a kind of accidental access method and base stations, to realize terminal Network with Random Multiple Access System.
In a first aspect, the embodiment of the invention provides a kind of accidental access methods, including：
Base station receives the random access lead code that terminal is sent；
Base station random access lead code and the random access preamble set pre-saved based on the received, obtain falling in
The parameter of relevant peaks in a few zero correlation window in each zero correlation window, the random access that random access preamble set includes
Lead code and zero correlation window correspond, and the parameter of relevant peaks includes the power and/or Timing Advance of random access lead code；
Meet default item when existing in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of part, base station sends the accidental access response message of the parameter including the relevant peaks for meeting preset condition
To terminal.
In a kind of possible design, further include：
When default there is no meeting in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of condition, base station is determined does not allow terminal to carry out random access based on received random access lead code.
In a kind of possible design, preset condition is specially：
The power of random access lead code is greater than first threshold；, and/or, Timing Advance is less than second threshold.
In a kind of possible design, base station is based on the received before random access lead code and the random access pre-saved
Leading code set obtains the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, including：
Random access lead code and random access preamble set, determination fall at least one zero phase based on the received for base station
Close the relevant peaks in window in each zero correlation window；
For the relevant peaks fallen at least one zero correlation window in each zero correlation window, base station determines that the relevant peaks are corresponding
Random access lead code power and/or Timing Advance, the peak of the relevant peaks according to the power of random access lead code
Be worth determining power, Timing Advance be the relevant peaks fall in zero correlation window at the time of with the initial time of the zero correlation window it
Between time.
In a kind of possible design, before base station receives the random access lead code that terminal is sent, further include：
When it is multiple for sending the terminal of random access lead code to base station in advance, base station is respectively to each of multiple terminals
Terminal indicate a random access lead code, into multiple terminals each terminal instruction a random access lead code be with
Mutual discontinuous random access lead code in the conjunction of machine access lead code collection.
Second aspect, the embodiment of the invention provides a kind of base stations, including：
Transmit-Receive Unit, for receiving the random access lead code of terminal transmission；
Processing unit, for according to random access preamble Transmit-Receive Unit received random access lead code and pre-saved
Code collection is closed, and the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, random access lead code are obtained
The random access lead code and zero correlation window that set includes correspond, and the parameter of relevant peaks includes the function of random access lead code
Rate and/or Timing Advance；Exist when in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When meeting the parameter of the relevant peaks of preset condition, control Transmit-Receive Unit by include meet preset condition relevant peaks parameter with
Machine access response message is sent to terminal；
Transmit-Receive Unit, be also used under control of the processing unit by include meet preset condition relevant peaks parameter with
Machine access response message is sent to terminal.
In a kind of possible design, processing unit is also used to：
When default there is no meeting in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of condition, determine does not allow terminal to be connect at random based on the received random access lead code of Transmit-Receive Unit
Enter.
In a kind of possible design, preset condition is specially：
The power of random access lead code is greater than first threshold, and/or, Timing Advance is less than second threshold.
In a kind of possible design, processing unit is in random access lead code based on the received and pre-saves random
Access lead code collection is closed, and the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window is obtained, specific to use
In：
Random access lead code and random access preamble set based on the received, determination fall at least one zero correlation window
In relevant peaks in each zero correlation window；
For the relevant peaks fallen at least one zero correlation window in each zero correlation window, determine the relevant peaks it is corresponding with
The power and/or Timing Advance of machine access lead code, the peak value of the relevant peaks is true according to the power of random access lead code
Fixed power, Timing Advance be the relevant peaks fall in zero correlation window at the time of and the initial time of the zero correlation window between
Time.
In a kind of possible design, processing unit is also used to：
Before the random access lead code that Transmit-Receive Unit receives that terminal is sent, when in advance to base station transmission random access preamble
When the terminal of code is multiple, by Transmit-Receive Unit, each terminal into multiple terminals indicates a random access preamble respectively
Code, the random access lead code indicated to each terminal are mutual discontinuous random access in random access preamble set
Lead code.
In technical solution provided in an embodiment of the present invention, base station receives the random access lead code that terminal is sent, base station root
According to received random access lead code and the random access preamble set pre-saved, obtain falling at least one zero correlation window
In relevant peaks in each zero correlation window parameter, when falling in the relevant peaks at least one zero correlation window in each zero correlation window
Parameter in exist meet preset condition relevant peaks parameter when, base station will include meet preset condition relevant peaks parameter
Accidental access response message be sent to terminal.Technical solution provided in an embodiment of the present invention realizes base station and is falling at least
The parameter of relevant peaks in one zero correlation window in each zero correlation window just connects to terminal transmission at random after meeting preset condition
Enter response, reduces the influences of the factors to random access procedure such as signal leakage, terminal bad timing, interference noise, effectively keep away
Base station is exempted from and has sent invalid random access response, helped to shorten random access time delay, has helped to reduce random access failure
Rate helps to reduce base station resource waste, facilitates the slow problem of the speed of service of improvement base station.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of zero correlation window when a kind of random access lead code in the prior art is sent in advance；
Fig. 2 is the structural representation for the zero correlation window that a kind of random access lead code in the prior art occurs when signal is revealed
Figure；
Fig. 3 is a kind of flow diagram of accidental access method provided in an embodiment of the present invention；
Fig. 4 is the process schematic of random access under a kind of cell handoff scenario provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of zero correlation window provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of base station provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another base station provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, is not whole embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of accidental access method and base stations, to realize terminal Network with Random Multiple Access System.It is existing
In some radio access technology schemes, due to terminal bad timing etc., terminal may in advance or delay to base station send with
Machine access lead code causes base station to be fallen in the zero correlation window of mistake according to the relevant peaks that the random access lead code obtains, this
Kind phenomenon is properly termed as preceding exit window.As shown in Figure 1, terminal send random access lead code be identified as 2 random access before
Leading code is fallen in the zero correlation window for being identified as 3 of random access lead code, and what base station can send the terminal received connects at random
The identity validation for entering the random access lead code of lead code is 3.The phenomenon that there may be energy leakages due to signal, when base station connects
Energy leakage occurs for the random access lead code received, may be such that base station obtains multiple relevant peaks, these relevant peaks may
It falls in multiple associated windows, therefore the identifying for random access lead code that base station determines may be the random access lead code of mistake
Mark.As shown in Fig. 2, due to the random access lead code generation energy leakage for being identified as 2 of random access lead code,
Base station according to the relevant peaks that the random access lead code obtains fall in random access lead code be identified as in 2 zero correlation window with
And in the zero correlation window for being identified as 3 of random access lead code, while another terminal sends random access lead code to base station
The random access lead code for being identified as 3 so that base station obtains two in being identified as in 3 zero correlation window for random access lead code
A relevant peaks, usually when in a zero correlation window there are when multiple relevant peaks according to the highest relevant peaks of peak value in multiple relevant peaks
Determine the parameter of relevant peaks, therefore base station is according to the letter for being identified as 2 random access lead code and revealing of random access lead code
Number corresponding relevant peaks determine the parameter of relevant peaks, so that sending the random access preamble for being identified as 3 of random access lead code
The parameter for the relevant peaks that the terminal of code receives is the parameter of the relevant peaks of mistake, causes the terminal random access failure.Furthermore
Interference noise may be mistaken for random access lead code by base station, so that sending random access preamble to base station in no terminal
Base station sends invalid random access response in the case where code.
In the technical solution of the embodiment of the present invention, before base station sends random access response to terminal, base station needs basis
The random access lead code that terminal is sent obtains falling in the ginseng of the relevant peaks at least one zero correlation window in each zero correlation window
Number, when base station determines that the parameters of relevant peaks meets preset condition, base station just passes through random access response and sends the phase to terminal
The parameter of Guan Feng reduces the influences of the factors to random access procedure such as signal leakage, terminal bad timing, interference noise, keeps away
Base station is exempted from and has sent invalid random access response, helped to shorten random access time delay, has helped to reduce random access failure
Rate helps to reduce base station resource waste, helps speed up the speed of service of base station.Wherein, method and apparatus are based on same
Inventive concept, since the principle that method and apparatus solve the problems, such as is similar, the implementation of apparatus and method can with cross-reference,
Overlaps will not be repeated.
Base station suitable for random access procedure of the embodiment of the present invention sends the scene of accidental access response message to terminal,
Base station sends the scene of accidental access response message to terminal in especially non-competing random access procedure.For example, cell switches
Target cell sends the scene of accidental access response message to terminal in the process, reaches in the downlink data that base station is sent to terminal
Base station when in upper and lower desynchronizing state of eating dishes without rice or wine of terminal and terminal sends the scene of accidental access response message, auxiliary to terminal
Base station sends the scene of accidental access response message to terminal in position fixing process.
The present embodiments relate to the network equipment include base station, base station includes multiple cells.According to the specific application occasions
Difference, base station are properly termed as access point again, or can be and refer to the accession in net in the sky on interface by one or more sectors
With the equipment or other titles of wireless terminal communications.The air frame and Internet protocol (Internet that base station can be used for receive
Protocol, IP) it is grouped and is mutually converted, as the router between wireless terminal and the rest part of access net, wherein
The rest part of access net may include Internet protocol (IP) communication network.Attribute management of the base station also tunable to air interface.
For example, base station can be global system for mobile communications (Global System for Mobile Communications, GSM)
Or CDMA access (Code Division Multiple Access, CDMA) in the network equipment (BTS,
BaseTransceiver Station), it is also possible to bandwidth CDMA access (Wide-band Code
DivisionMultiple Access, WCDMA) in the network equipment (NodeB), can also be that the evolved network in LTE is set
For (evolutional Node B, eNB or e-NodeB), do not limited in the embodiment of the present invention.
The present embodiments relate to terminal, user can be directed to, the equipment of voice and/or data connectivity, tool are provided
There is the handheld device of wireless connecting function or is connected to other processing equipments of radio modem.Wireless terminal can be with
It is communicated through wireless access network (Radio Access Network, RAN) with one or more core nets, wireless user equipment
It can be mobile terminal, such as mobile phone (or be " honeycomb " phone) and the computer with mobile terminal, for example, it may be
Portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device, they exchange language with wireless access network
And/or data.For example, personal communication service (Personal Communication Service, PCS) phone, wireless phone,
Session initiation Protocol (Session Initiated Protocol, SIP) phone, wireless local loop (Wireless
LocalLoop, WLL) it stands, the equipment such as personal digital assistant (Personal Digital Assistant, PDA).Wireless user
Equipment is referred to as system, subscriber unit (Subscriber Unit), subscriber station (SubscriberStation), movement station
(Mobile Station), mobile station (Mobile), distant station (Remote Station), access point (Access Point),
Remote terminal (Remote Terminal), user terminal (User Terminal), is used access terminal (AccessTerminal)
Act on behalf of (User Agent), user equipment (User Device) or user equipment (User Equipment) in family.
The present embodiments relate to random access, be the necessary process that Radio Link is established between terminal and network, eventually
It completes to be communicated after random access with base station in end.Random access can be divided into competition random access and non-competing connect at random
Enter, competition random access is initiated by terminal, and non-competing random access is initiated by base station.
The present embodiments relate to random access lead code, be by the Zadoff-Chu sequence with zero correlation characteristic into
The sequence of values that row cyclic shift generates.Since the autocorrelation and cross correlation of random access lead code are preferable, two
Different random access lead code carries out in the obtained result sequence of related operation being not in peak value, and two it is identical with
Machine access lead code carries out will appear a peak value in the obtained result sequence of related operation, which is referred to as relevant peaks.
It preserves a random access leader sequence code collection in each cell of usual base station to close, the random access leader sequence code collection
Close and be made of at least one Zadoff-Chu sequence and its corresponding random access lead code, each random access lead code with
The correlation peak-to-mean that corresponding Zadoff-Chu sequence obtains after being calculated is fallen in a corresponding zero correlation window, zero correlation window
It is corresponded with the mark of random access lead code.
The present embodiments relate to related algorithm, can be one of related algorithm in the prior art or a variety of,
These related algorithms are divided into auto-correlation algorithm and cross correlation algorithm, are not construed as limiting in present invention implementation.
The present embodiments relate to zero correlation window refer to the not correlation for including in two sequences part length.
Long can be of the window of the zero correlation used in random access procedure is allocated to terminal by base station.
The each embodiment of the present invention is described in detail with reference to the accompanying drawings of the specification.It should be noted that of the invention
The displaying sequence of embodiment only represents the sequencing of embodiment, does not represent the superiority and inferiority of technical solution provided by embodiment.
As shown in figure 3, the embodiment of the invention provides a kind of accidental access method, this method includes：
S301, base station receive the random access lead code that terminal is sent.
Wherein, base station can pre-save the conjunction of random access leader sequence code collection, should be by least one Zadoff-Chu sequence
What column and its corresponding random access lead code formed, each random access lead code is carried out with corresponding Zadoff-Chu sequence
The relevant peaks obtained after relevant calculation are in unique corresponding zero correlation window, and what random access preamble set included connects at random
Enter lead code and zero correlation window corresponds, is corresponded between zero correlation window and the mark of random access lead code.
In S301 base station receive terminal send random access lead code, the random access lead code can be terminal according to
The mark of the random access lead code that base station is sent is determining, be also possible to terminal can be used at least one pre-saved it is competing
Strive a random access lead code for randomly choosing out in the random access lead code of random access.
Preferably, before base station receives the random access lead code that terminal is sent, before sending random access to base station in advance
When the terminal of leading code is multiple, base station each terminal into multiple terminals can indicate a random access lead code respectively.
Base station each terminal into multiple terminals can send a random access lead code respectively, can also be respectively to multiple terminals
In each terminal send a random access lead code mark.Wherein, one of each terminal instruction into multiple terminals
A random access lead code is mutual discontinuous random access lead code in random access preamble set, these are mutually discontinuous
Interval can be identical between random access lead code, be also possible to different, be not construed as limiting in the embodiment of the present invention.Due to
Non-competing random access be initiated by base station, and compete random access be initiated by terminal, therefore above-mentioned base station respectively to
The method that each terminal in multiple terminals indicates a random access lead code is advantageously employed in the field of non-competing random access
Scape.
In this way, base station can be indicated by terminal when it is multiple for sending the terminal of random access lead code to base station in advance
Random access lead code, when so that multiple terminals sending random access lead code to the same base station, multiple phases that base station obtains
Guan Feng is respectively fallen in the different zero correlation windows with certain intervals, avoids the occurrence of the energy leakage because of random access lead code
The phenomenon that obtaining multiple relevant peaks in a zero correlation window caused by and helps to shorten random access time delay, helps to drop
Low random access failure rate.
By taking the random access procedure under cell handoff scenario as an example, switch as shown in figure 4, source cell is sent to purpose cell
Request message, purpose cell send switching request acknowledgement message, the switching after receiving switching request message, to source cell
The base station that carrying in request confirmation message has purpose cell to be belonged to is the corresponding random access of random access code that terminal 1 is distributed
Code mark m, the random access code mark for terminal 1 using the corresponding random access code of mark of the random access code come
Network with Random Multiple Access System.After source cell receives the switching request acknowledgement message of purpose cell transmission, wireless money is sent to terminal 1
Source control (RadioResource Control, RRC) connection reconfiguration sets message, which, which sets, carries mesh in message
The base station that is belonged to of cell be the random access code that terminal 1 is distributed mark m.Terminal 1, which receives the RRC connection reconfiguration and sets, to disappear
After breath, the random access code for being identified as m of random access code is sent to purpose cell.Similar, purpose cell is belonged to
Base station is the mark m+2 for the corresponding random access code of random access code that terminal 2 is distributed, and final terminal 2 receives source cell hair
After the RRC connection reconfiguration sent sets message, the random access code for being identified as m+2 of random access code is sent to purpose cell.
S302, base station random access lead code and the random access preamble set pre-saved based on the received, obtain
Fall in the parameter of the relevant peaks at least one zero correlation window in each zero correlation window, random access preamble set include with
Machine access lead code and zero correlation window correspond.
Wherein, the parameter of relevant peaks may include the power and/or Timing Advance of random access lead code.Random access
The power of the power that the peak value of the relevant peaks determines according to the power of lead code, random access lead code adjusts certainly for terminal
The power of body transmission upstream data.Timing Advance carries out uplink synchronous for terminal and base station, and Timing Advance is the correlation
The time at the time of zero correlation window that peak is fallen between the initial time of the zero correlation window.It is also understood that the relevant peaks
The distance between the position of the zero correlation window fallen in and initial position of the zero correlation window and Timing Advance are directly proportional.Such as Fig. 5
It is shown, Timing Advance be at the time of the random access code that falls in of relevant peaks is identified as in 2 zero correlation window with the random access
Time between the initial time for the zero correlation window that code is identified as 2.Random access preamble set is by least one Zadoff-
What Chu sequence and its corresponding random access lead code formed.
Base station can will be in received random access lead code and the random access preamble set pre-saved in S302
Each Zadoff-Chu sequence carry out relevant calculation, the random access lead code for including due to random access preamble set with
Zero correlation window corresponds, therefore the available relevant peaks fallen at least one zero correlation window in each zero correlation window, into
And the parameter of relevant peaks is obtained according to the relevant peaks.For the correlation fallen at least one zero correlation window in each zero correlation window
Peak, base station determine the parameter of the corresponding relevant peaks of the relevant peaks respectively, i.e. base station determines that the relevant peaks are corresponding respectively and connects at random
Enter the power and/or Timing Advance of lead code, such base station can determine random access preamble according to the parameter of relevant peaks
The corresponding relevant peaks of code, and determine whether the random access lead code is at the time of determination according to the configuration parameter that base station issues
It is sent to base station.
It should be noted that the prior art can also be used other than determining the parameter of relevant peaks using the above method
In other methods determine the parameters of relevant peaks, be not construed as limiting in the embodiment of the present invention
S303, when exist in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window meet it is pre-
If when the parameter of the relevant peaks of condition, base station will include the accidental access response message for meeting the parameter of relevant peaks of preset condition
It is sent to terminal.
Wherein, preset condition is greater than first threshold for the power of random access lead code, and/or, Timing Advance is less than
Second threshold.I.e.：When the parameter of relevant peaks includes the power of random access lead code, preset condition can be for before random access
The power of leading code is greater than first threshold；When the parameter of relevant peaks includes Timing Advance, preset condition can be time advance
Amount is less than second threshold；When the parameter of relevant peaks includes the power and Timing Advance of random access lead code, preset condition
First threshold can be greater than for the power of random access lead code and Timing Advance is less than second threshold.
Usual base station is only capable of obtaining according to the random access lead code received falls in a zero correlation window one
Relevant peaks, but when energy leakage occurs for the random access lead code received when base station, base station carry out relevant calculation it
The multiple relevant peaks fallen in a zero correlation window may be obtained afterwards, or fall in multiple correlations in multiple zero correlation windows
Peak, the relevant peaks obtained according to random access lead code with the random access preamble set pre-saved in this multiple relevant peaks
Only one, and remaining correlation peak-to-mean is according to the signal of the leakage of random access lead code and the random access pre-saved
The relevant peaks that lead code set obtains.When the parameter for the relevant peaks that base station includes to the accidental access response message that terminal is sent is
According to the parameter for the relevant peaks that the signal of the leakage of random access lead code obtains, due to the leakage according to random access lead code
The parameters of the signal obtained parameter of relevant peaks and the relevant peaks obtained according to random access lead code there are relatively large deviation, meetings
Lead to random access failure.Furthermore based on similar description above, interference noise is mistaken for random access by base station bad timing
The reasons such as lead code may also will lead to random access failure, and details are not described herein again.For these reasons, base station can pass through choosing
Select the parameter for the relevant peaks for meeting preset condition reduce signal leakage, terminal bad timing, interference noise are mistaken for connecing at random
Enter influence of the factors such as lead code to random access procedure, improves the success rate of random access.Before the random access of relevant peaks
The power of leading code be greater than first threshold when, the relevant peaks be according to terminal send random access lead code obtain, rather than
It is obtained according to the signal of the leakage of random access lead code or interference noise.When the Timing Advance of relevant peaks is less than second
When threshold value, which is the random access sent at the time of determination according to terminal according to the configuration parameter that base station issues to base station
What lead code obtained, rather than what the random access lead code for shifting to an earlier date or delaying transmission according to terminal obtained.
Based on the above principles, when the ginseng for falling in the relevant peaks at least one zero correlation window in each zero correlation window in S303
When there is the parameter for the relevant peaks for meeting preset condition in number, base station can will include the parameter for meeting the relevant peaks of preset condition
Accidental access response message be sent to terminal, in order to which terminal can adjust the configuration of itself and complete according to the parameter of relevant peaks
It at random access, avoids base station and sends invalid random access response, help to shorten random access time delay, help to reduce
Random access failure rate helps to reduce base station resource waste, helps speed up the speed of service of base station.
Preferably, when there is no full in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of sufficient preset condition, base station is determined does not allow terminal to carry out at random based on received random access lead code
Access.In this way, avoiding base station sends invalid random access response to terminal, helps to reduce base station resource waste, help
In the speed of service for accelerating base station.
In the embodiment of the present invention, first threshold and second threshold can be set by configuring the parameter of base station.It is configuring
The target received power for the random access lead code that the reception terminal that can be configured when first threshold with reference base station is sent, by first
Threshold value be set smaller than or equal to the target received power numerical value, in order to meet the needs of in practical application.It needs to illustrate
, first threshold can also use its other party in the prior art other than determining first threshold using the above method
Method determines first threshold, is not construed as limiting in the embodiment of the present invention.
It, can be using one of following two mode when configuring second threshold in the embodiment of the present invention：
Mode one：The M being calculated by the following formula can be used to indicate Timing Advance in the case where preceding exit window
It may be close to maximum value, the setting of the second threshold of base station carried out referring again to the M being calculated：
M=(Ncs—1)*Nseq/(Nzc*m)
Wherein, NseqFor the length of random access lead code, NzcFor random access preamble set corresponding with zero correlation window
In include Zadoff-Chu sequence sequence length, NcsFor the length of the zero correlation window where relevant peaks, m is nonzero integer.
Mode two：According to the radius of society for the cell for belonging to base station, it is calculated by the following formula out and is located at the cell side
Second threshold is set greater than or is equal to the Timing Advance by the corresponding Timing Advance of signal transmitted by the terminal of edge：
Timing Advance=(r*n)/(c*ts*k)
Wherein, r is the radius of society for belonging to the cell of base station, and c is the light velocity, and ts is the sampling interval, and n and k are non-zero
Integer, such as it can be 16 that n, which can be 2, k,.
It should be noted that second threshold other than determining second threshold using aforesaid way, can also use existing
There are the other methods in technology to determine second threshold, is not construed as limiting in the embodiment of the present invention.
In accidental access method provided in an embodiment of the present invention, base station receives the random access lead code that terminal is sent, base
It stands random access lead code and the random access preamble set pre-saved based on the received, obtains falling at least one zero phase
The parameter for closing the relevant peaks in window in each zero correlation window, when falling in the phase at least one zero correlation window in each zero correlation window
When there is the parameter for the relevant peaks for meeting preset condition in the parameter of Guan Feng, base station will include the relevant peaks for meeting preset condition
The accidental access response message of parameter is sent to terminal.Accidental access method provided in an embodiment of the present invention, base station fall in
The parameter of relevant peaks in a few zero correlation window in each zero correlation window is just sent at random to terminal after meeting preset condition
Access response, reduces the influences of the factors to random access procedure such as signal leakage, terminal bad timing, interference noise, effectively
It avoids base station and sends invalid random access response, help to shorten random access time delay, helping, which reduces random access, loses
Rate is lost, helps to reduce base station resource waste, facilitates the slow problem of the speed of service of improvement base station.
In conjunction with above embodiments, the embodiment of the invention provides a kind of base station, which can use the corresponding implementation of Fig. 3
The method that example provides, as shown in fig.6, base station includes：Transmit-Receive Unit 601 and processing unit 602.
Transmit-Receive Unit 601, for receiving the random access lead code of terminal transmission；
Processing unit 602, for being connect at random according to the received random access lead code of Transmit-Receive Unit 601 with what is pre-saved
Enter lead code set, obtains the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, random access
The random access lead code and zero correlation window that lead code set includes correspond, and the parameter of relevant peaks includes random access preamble
The power and/or Timing Advance of code；When the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the middle parameter that there are the relevant peaks for meeting preset condition, control Transmit-Receive Unit will include the ginseng for meeting the relevant peaks of preset condition
Several accidental access response messages are sent to terminal；
Transmit-Receive Unit 601 is also used under control of the processing unit will include the parameter for meeting the relevant peaks of preset condition
Accidental access response message be sent to terminal.
Optionally, processing unit 602 is also used to：
When default there is no meeting in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of condition, determine does not allow terminal to be connect at random based on the received random access lead code of Transmit-Receive Unit
Enter.
Optionally, preset condition be specially random access lead code power be greater than first threshold, and/or, time advance
Amount is less than second threshold.
Optionally, processing unit 602 is in random access lead code based on the received and the random access preamble pre-saved
Code collection is closed, and is obtained the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, is specifically used for：
Random access lead code and random access preamble set based on the received, determination fall at least one zero correlation window
In relevant peaks in each zero correlation window；
For the relevant peaks fallen at least one zero correlation window in each zero correlation window, determine the relevant peaks it is corresponding with
The power and/or Timing Advance of machine access lead code, the peak value of the relevant peaks is true according to the power of random access lead code
Fixed power, Timing Advance be the relevant peaks fall in zero correlation window at the time of and the initial time of the zero correlation window between
Time.
Optionally, processing unit 602 is also used to：
Before the random access lead code that Transmit-Receive Unit 601 receives that terminal is sent, when in advance to base station transmission random access
When the terminal of lead code is multiple, connect at random by each terminal instruction one of the Transmit-Receive Unit 601 respectively into multiple terminals
Enter lead code, to each terminal indicate a random access lead code be random access preamble set in mutually it is discontinuous with
Machine access lead code.
It should be noted that being schematical, only a kind of logic function to the division of unit in the embodiment of the present invention
It divides, there may be another division manner in actual implementation.In addition, each functional unit in each embodiment of the application can be with
It is integrated in a processing unit, is also possible to each unit and physically exists alone, it can also be with two or more unit collection
At in a unit.Above-mentioned integrated unit both can take the form of hardware realization, can also use SFU software functional unit
Form realize.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the application
The all or part of the steps of embodiment the method.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory
(Read-OnlyMemory, ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc.
The various media that can store program code.
Based on above embodiments, the embodiment of the invention also provides a kind of base station, which can be used the corresponding implementation of Fig. 3
The method that example provides, can be identical base station with base station shown in fig. 6.As shown in fig.7, base station includes：Processor 701,
Transceiver 702, bus 703 and memory 704, wherein：
Processor 701 executes following process for reading the program in memory 704：
Processor 701 will receive the random access lead code of terminal transmission for controlling transceiver 702；
Processor 701 is also used to according to the received random access lead code of transceiver 702 and the random access pre-saved
Lead code set, obtains the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, before random access
The random access lead code and zero correlation window that leading code set includes correspond, and the parameter of relevant peaks includes random access lead code
Power and/or Timing Advance；
Processor 701 is also used to when the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the middle parameter that there are the relevant peaks for meeting preset condition, control transceiver 702 will include the relevant peaks for meeting preset condition
The accidental access response message of parameter is sent to terminal.
Optionally, processor 701 is also used to：
When default there is no meeting in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of condition, determine does not allow terminal to carry out at random based on the received random access lead code of transceiver 702
Access.
Optionally, preset condition be specially random access lead code power be greater than first threshold, and/or, time advance
Amount is less than second threshold.
Optionally, processor 701 obtains falling in the ginseng of the relevant peaks at least one zero correlation window in each zero correlation window
When number, it is specifically used for：
Random access lead code and random access preamble set based on the received, determination fall at least one zero correlation window
In relevant peaks in each zero correlation window；
For the relevant peaks fallen at least one zero correlation window in each zero correlation window, determine the relevant peaks it is corresponding with
The power and/or Timing Advance of machine access lead code, the peak value of the relevant peaks is true according to the power of random access lead code
Fixed power, Timing Advance be the relevant peaks fall in zero correlation window at the time of and the initial time of the zero correlation window between
Time.
Optionally, processor 701 is also used to：Control transceiver 702 receive terminal send random access lead code it
Before, when it is multiple for sending the terminal of random access lead code to base station in advance, control transceiver 702 is respectively into multiple terminals
Each terminal indicates a random access lead code, before the random access lead code indicated to each terminal is random access
Mutual discontinuous random access lead code in leading code set.
Transceiver 702, for sending and receiving data under the control of processor 701.
Processor 701, transceiver 702 and memory 704 are connected with each other by bus 703；Bus 703 can be peripheral hardware
Component connection standard (peripheral component interconnect, PCI) bus or expanding the industrial standard structure
(extended industry standard architecture, EISA) bus etc..Bus can be divided into address bus, number
According to bus, control bus etc..
Wherein, in Fig. 7, bus architecture may include the bus and bridge of any number of interconnection, specifically by processor 701
The various circuits for the memory that the one or more processors and memory 704 of representative represent link together.Bus architecture is also
Various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like can be linked together, these are all
It is it is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 702 can
To be multiple element, that is, includes transmitter and transceiver, the list for communicating over a transmission medium with various other devices is provided
Member.Processor 701, which is responsible for management bus architecture and common processing, memory 704, can store processor 701 and is executing operation
When used data.
Optionally, processor 701 can be central processing unit, specific integrated circuit (Application
SpecificIntegrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate
Array, FPGA) or Complex Programmable Logic Devices (Complex Programmable Logic Device, CPLD).
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of accidental access method, which is characterized in that including：
Base station receives the random access lead code that terminal is sent；
The base station random access lead code and the random access preamble set pre-saved based on the received, are fallen
The parameter of relevant peaks at least one zero correlation window in each zero correlation window, the random access preamble set include
Random access lead code and zero correlation window correspond, the parameter of the relevant peaks include random access lead code power and/
Or Timing Advance；
Meet default item when existing in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of part, the base station by include the relevant peaks for meeting preset condition parameter random access response
Message is sent to the terminal.
2. the method as described in claim 1, which is characterized in that further include：
When default there is no meeting in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of condition, the base station determine based on the received random access lead code do not allow the terminal into
Row random access.
3. method as described in claim 1 or 2 is any, which is characterized in that the preset condition is specially：The random access
The power of lead code is greater than first threshold, and/or, the Timing Advance is less than second threshold.
4. the method as described in claim 1, which is characterized in that the base station based on the received the random access lead code and
The random access preamble set pre-saved obtains falling in the relevant peaks at least one zero correlation window in each zero correlation window
Parameter, including：
The random access lead code and the random access preamble set, determination are fallen at least based on the received for the base station
Relevant peaks in one zero correlation window in each zero correlation window；
For the relevant peaks fallen at least one zero correlation window in each zero correlation window, the base station determines the relevant peaks
The power and/or Timing Advance of the corresponding random access lead code, according to the power of the random access lead code
The power that the peak values of the relevant peaks determines, the Timing Advance be the relevant peaks fall in zero correlation window at the time of with zero phase
Close the time between the initial time of window.
5. the method as described in claim 1, which is characterized in that the base station receive random access lead code that terminal is sent it
Before, further include：
When it is multiple for sending the terminal of random access lead code to the base station in advance, the base station is respectively to the multiple terminal
In each terminal indicate a random access lead code, it is described into multiple terminals each terminal instruction one connect at random
Entering lead code is mutual discontinuous random access lead code in the random access preamble set.
6. a kind of base station, which is characterized in that including：
Transmit-Receive Unit, for receiving the random access lead code of terminal transmission；
Processing unit, for according to the random access Transmit-Receive Unit the received random access lead code and pre-saved
Lead code set obtains the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window, described to connect at random
Enter the random access lead code and zero correlation window one-to-one correspondence that lead code set includes, the parameter of the relevant peaks includes connecing at random
Enter the power and/or Timing Advance of lead code；When the phase fallen at least one zero correlation window in each zero correlation window
When there is the parameter for the relevant peaks for meeting preset condition in the parameter of Guan Feng, controlling the Transmit-Receive Unit will include described meet in advance
If the accidental access response message of the parameter of the relevant peaks of condition is sent to the terminal；
The Transmit-Receive Unit is also used under the control of the processing unit include the relevant peaks for meeting preset condition
The accidental access response message of parameter is sent to the terminal.
7. base station as claimed in claim 6, which is characterized in that the processing unit is also used to：
When default there is no meeting in the parameter for falling in the relevant peaks at least one zero correlation window in each zero correlation window
When the parameter of the relevant peaks of condition, determining does not allow the end based on the received random access lead code of the Transmit-Receive Unit
End carries out random access.
8. the base station as described in claim 6 or 7 is any, which is characterized in that the preset condition is specially：
The power of the random access lead code is greater than first threshold, and/or, the Timing Advance is less than second threshold.
9. base station as claimed in claim 6, which is characterized in that the processing unit obtains falling at least one zero correlation window
When the parameter of the relevant peaks in each zero correlation window, it is specifically used for：
According to the received random access lead code of the Transmit-Receive Unit and the random access preamble set, determination is fallen in
Relevant peaks at least one zero correlation window in each zero correlation window；
For the relevant peaks fallen at least one zero correlation window in each zero correlation window, the corresponding institute of the relevant peaks is determined
State the power and/or Timing Advance of random access lead code, the relevant peaks according to the power of the random access lead code
Peak value determine power, the Timing Advance be the relevant peaks fall in zero correlation window at the time of with the zero correlation window rise
Time between moment beginning.
10. base station as claimed in claim 6, which is characterized in that the processing unit is also used to：
Before the random access lead code that the Transmit-Receive Unit receives that terminal is sent, when in advance to base station transmission random access
When the terminal of lead code is multiple, by the Transmit-Receive Unit respectively each terminal into the multiple terminal indicate one with
Machine access lead code, the random access lead code indicated to each terminal are in the random access preamble set
Mutual discontinuous random access lead code.
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