A kind of accidental access method and deviceTechnical field
The application is related to wireless communication technology field, more particularly to a kind of physical accidental cut-in method and device.
Background technology
GSM of the present invention, refer to operator by disposing wireless access network equipment (such as base station), and coreHeart net equipment (such as attaching position register, Home Location Register, HLR) etc., carried for user terminal (such as mobile phone)For the system of communication service.Mobile communication experienced the first generation, the second generation, the third generation, forth generation.First third-generation mobile communication refers toInitial simulation, the cellular telephony standard for only limiting voice call, mainly using analogue technique and frequency division multiple accessThe cut-in method of (Frequency Division Multiple Access, FDMA)；Generation Mobile Telecommunication System introduces numeralTechnology, improve network capacity, improve speech quality and confidentiality, with " global system for mobile communications " (Global SystemFor Mobile Communication, GSM) and " CDMA " (Code Division Multiple Access, CDMAIS-95) it is representative；3G (Third Generation) Moblie refers mainly to CDMA2000, and tri- kinds of technologies of WCDMA, TD-SCDMA, are more with code divisionLocation is as access technology；The standard of forth generation GSM is relatively uniform in the world, is International Organization for standardizationLong Term Evolution (Long Term Evolution/Long the Term Evolution-Advanced, LTE/LTE- that 3GPP is formulatedA), its it is descending based on orthogonal frequency more directly enter (Orthogonal Frequency Division Multiple Access,OFDMA), it is up that (Single Carrier-Frequency Division Multiple are directly entered based on single carrier frequency division moreAccess, SC-FDMA) access way, according to flexible bandwidth and adaptive modulation coding mode, reached down peak magnitudeSpeed 1Gbps, upstream peak speed 500Mbps high-speed transfer.Fig. 1 schematically illustrates the basic framework of mobile communications network.
MulteFire is on the basis of LTE R13LAA downlink transmission methods, newly defines ascending transmission method, and canTo work independently in the LTE technologies of unauthorized frequency range, i.e. stand-alone LTE-U.One eNB TXOP as shown in Fig. 2 itsMiddle sPUCCH last 4 symbols for taking up-downgoing switching subframe, the position of up-downgoing switching subframe can be by currentOr C-PDCCH in previous subframe is indicated.PRACH in MF in support two kinds of PRACH format, i.e. sPUCCHPRACH (abbreviation mf-ePRACH) in (abbreviation mf-sPRACH) and ePUCCH.
The ascending resource of assignment period is supported in MF, wherein just include PRACH resources, the periodic ascending resourcePurposes can be rewritten by eNB, such as by distributing and transmitting downlink resource., now, then UE is done before using the ascending resourceLBT will be unsuccessful, so as to avoid up-downgoing interference problem.In addition, UE is sent in the PRACH resources for initiating periodically configurationBefore preamble, it may not be necessary to solve C-PDCCH.
To sum up, in MF, due to allow UE do not read C-PDCCH (may be used to indicate sPUCCH, TXOP length etc. believeBreath) in the case of in the PRACH resource locations of configuration directly initiate Stochastic accessing, how between ensureing to send PRACH UEAnd on the premise of orthogonal between PRACH and PUCCH/PUSCH, power consumption/time delay that UE sends PRACH is reduced, improve PRACHSending probability etc..
The content of the invention
The present invention proposes a kind of distribution method of periodic physical random access resource, network equipment assignment periodMultiple Physical Random Access Channels in multiple continuous subframes, one of LBT successes are selected in multiple subframe terminals of distributionSubframe send accidental access signal, improve the probability that terminal is sent in assignment period, reduce access delay.
The present invention proposes a kind of distribution method of physical accidental access-in resource, it is characterised in that methods described includes：
The time-domain resource position that the periodic physical accidental in this cell accesses signal PRACH is broadcasted by system messageConfigured with frequency domain resource position, the periodically physical accidental access signal time-domain resource includes N number of continuous subframes, wherein NFor positive integer；Aperiodic physical accidental access signal PRACH time-domain resource position is configured by downwards public control informationWith frequency domain resource position, or the time domain that aperiodic physical accidental accesses signal PRACH configured by downwards public control informationResource location.
The time-domain resource position of the periodically physical accidental access signal PRACH connects including periodic physical accidentalEnter the cycle of signal, and periodically transmission window length of the physical accidental access signal in a cycle, the transmission windowLength can be represented by number of subframes N, and the original position of transmission window.
The continuous subframes number M that the periodically physical accidental access signal PRACH can take in transmission window lengthIt can be indicated by system message, the M is less than or equal to N.
In the periodic physical accidental access signal transmission window of the system message configuration, short Stochastic accessing letter can configureNumber mf-sPRACH and/or extension accidental access signal mf-ePRACH sequence index, the short accidental access signal mf-SPRACH takes the preceding L OFDM symbol transmission (L, K positive integer and L≤K) in the last K OFDM symbol of a subframe, describedThe OFDM symbol that extension accidental access signal mf-ePRACH takes one or more subframes is transmitted.
In the periodic physical accidental access signal transmission window of the system message configuration, short Stochastic accessing letter can configureNumber mf-sPRACH and/or extension accidental access signal mf-ePRACH sequence index, the short accidental access signal mf-SPRACH takes the transmission of a subframe last K OFDM symbol, the extension accidental access signal mf-ePRACH occupancy 1 orMultiple subframes are transmitted.Beginnings of the extension accidental access signal mf-ePRACH in a subframe can be included in system informationPosition, starting positions of the configuration extension accidental access signal mf-ePRACH in subframe is the 0th ODFM symbol or the 1stODFM symbols.
Signal configuration, which can be accessed, by system message for the periodically physical accidental can transmit the preferential of detection LBTLevel, the one or more that the priority parameters include but is not limited in following parameter, energy measuring thresholding, Backoff window are bigIt is small, idle time of channel length.
The periodically physical accidental access signal PRACH and acyclic physical accidental access signal frequency domain moneySource position, using interlace as frequency domain unit, can specifically be indicated by way of bit map multiple PRACH resources orMultiple interlace of one PRACH resource occupation, or to be initially value indexed mode instruction interlace numberings.It is differentSubframe can configure identical or different PRACH frequency domain positions, and the frequency domain position of different subframes can be different.
Match somebody with somebody the time-domain resource position that the downwards public control information configures aperiodic physical accidental access signal PRACHThe method of putting is to indicate whether include accidental access signal transmission opportunity in the subframe where the downwards public control information, and/orIndicate whether include accidental access signal transmission opportunity in k-th subframe below, the K is positive integer.
Terminal receives the time-domain resource for the periodic physical accidental access signal PRACH that base station is sent in system messagePosition and the configuration of frequency domain resource position.Terminal configures and transmitted uplink random access signal according to described information.The cycleProperty physical accidental access signal PRACH time-domain resource position include cycle of periodic physical accidental access signal, withAnd periodically transmission window length of the physical accidental access signal in a cycle, the transmission window length can pass through number of sub framesMesh N is represented, and the original position of transmission window.
Terminal reads short accidental access signal mf-sPRACH and/or extension accidental access signal mf- in system messageEPRACH configuration, the configuration include but is not limited to sequence index.Terminal is not reading the situation of downwards public control informationUnder periodic physical accidental access signal transmission window original position before carry out can transmit detection LBT, if LBT success,Include but is not limited to physical accidental access signal PRACH sequence index and frequency domain resource position letter according to what is configured in system messageCease transmitting physical accidental access signal；If LBT fails, and also has in the physical accidental access signal transmission window in current periodPRACH resources can be transmitted, then continue LBT, attempt next PRACH chances；If the physical accidental in current period connectsEnter LBT in signal transmission window to fail, then wait next cycle to reattempt to LBT and accidental access signal transmission.
Terminal reads short accidental access signal mf-sPRACH and/or extension accidental access signal mf- in system messageEPRACH configuration, the configuration includes but is not limited to sequence index, and K of the terminal before accidental access signal transmission window is descendingDownwards public control information is detected in subframe and in accidental access signal transmission window.If detect in downwards public control informationComprising aperiodic physical accidental access signal PRACH configuration, and terminal is in the transmission window and last descending sub frameLBT successes before last K OFDM symbol in the subframe of coincidence, then send short accidental access signal mf-sPRACH；If LBT losesLose, and also have PRACH resources to transmit in the physical accidental access signal transmission window in current period, then continue LBT, tasteTry next PRACH chances；If LBT fails in the physical accidental access signal transmission window in current period, wait nextThe individual cycle reattempts to LBT and accidental access signal is sent.
When other up channel/signals and PRACH are in same subframe, the network equipment is by distributing different frequency resourcesRealize multiplexing in position
To sum up, the invention provides a kind of effective accidental access method, particularly when unauthorized frequency range uses.
Brief description of the drawings
Fig. 1 is the network architecture schematic diagram using the present invention
Fig. 2 is transmission frame-form schematic diagram of the present invention
Fig. 3 is the random access window schematic diagram of present pre-ferred embodiments one
Fig. 4 is the random access procedure schematic diagram of present pre-ferred embodiments one
Specific implementation method
For the object, technical solution and advantage of the application are more clearly understood, develop simultaneously embodiment referring to the drawings, rightThe application is described in further detail.
Embodiment one：PRACH resource allocations and instruction based on periodic windows
The PRACH configuration informations of this cell are indicated in system message such as mfSIB, wherein PRACH configuration can includeAt least two, i.e. periodicity PRACH resources and aperiodicity PRACH resources.Refer to be assigned with for periodicity PRACH resourcesThe subframe of PRACH resources only will periodically occur in the resource location that may be specified, but be whether that the subframe is necessarily used forPRACH transmission depends on eNB actual schedules, the channel competition situation of eNB sides, the channel competition situation of UE sides.For example, work as eNBThe a certain PRACH specified resource location and before i.e. start send downstream signal, then UE do not reading down control channelWhen (such as C-PDCCH), even if the PRACH resources for still attempting to specify at this are transmitted, but can due to LBT failure and nothingMethod is sent, and finally realizes that eNB controls the purpose used of the resource.In order to realize the relatively flexible up-downgoings of eNB simultaneouslyResource distribution, and the validity of the periodicity PRACH resources of distribution is improved, PRACH resources can be carried out in the form of subframe windowPeriodically distribution, terminal have multiple PRACH transmission opportunitys in subframe window, as shown in Figure 3.
Wherein PRACH windows are made up of multiple continuous subframes, and its cycle and original position can be by indicating respectively differenceDeviation post in cycle, such as：
Its window, which is grown, to be represented by number of subframes, such as
PRACH-OccasionDuration-MF CHOICE{
duration-MF INTEGER(1..maxPRACH-Duration)
},
When PRACH window interior all subframes acquiescence is configured PRACH resources, without extra instruction.WhenWhen PRACH window interior part subframe is configured PRACH resources, it is also necessary to further sons of the instruction PRACH in windowFrame position, such as flexible subframe position is indicated in a manner of bitmap, or refer in a manner of index combines fixed patternShow subframe position (such as mod (subframe number, N) mode) etc..
For PRACH frequency domain resource position, using interlace as frequency domain unit, can be referred to by way of bitmapShow multiple PRACH resources or multiple interlace that PRACH takes, or index modes indicate PRACH'sInterlace numberings or Base Serial Number etc..Different subframes can configure identical or different PRACH frequency domain positions, equallyFrequency hopping can be supported.
It can be the different window of mf-ePRACH with mf-sPRACH assignment configurations, or configure same window.
As the PRACH being configured with PRACH window in multiple subframes, each it is configured with PRACH subframes correspondingPRACH format, can be only all mf-ePRACH；Or one of subframe (such as first subframe) is only mf-Remaining subframe of sPRACH is only mf-ePRACH；Or one of subframe is mf-sPRACH or mf-ePRACH (the present mf- of UELBT is carried out before ePRACH resources, LBT is carried out before mf-sPRACH resource again if unsuccessful), remaining subframe is only mf-ePRACH。
As the PRACH being configured with PRACH window in 1 subframe, PRACH format corresponding to the subframe can be withOnly mf-sPRACH, either only mf-ePRACH or be mf-sPRACH or mf-ePRACH.
LBT type and priority：Can be defaulted as that (25us can be defaulted as mf-sPRACH using LBT cat-4LBT cat-2), the priority specifically used can provide in advance or according to eNB system message instruction, for based on tuneThe non-competing Random Access of degree can be according to the LBT type and priority of instruction, for can determine the TXOP in eNBWithin PRACH can use 25us LBT cat-2.
LBT gap (first symbol of subframe is vacated for carrying out LBT)：Due to the son where PRACH can not be determined in advanceWhether frame punch for LBT gap to first OFDM symbol, in order to reduce the PRACH and PUSCH/ in same subframeBlock between ePUCCH, mf-ePRACH original position can be given tacit consent to from second sign-on, alternatively, if UE energyEnough positional informations for obtaining LBT gap from C-PDCCH in advance, can mf-ePRACH can be from the case of without LBT gapFirst sign-on.Or acquiescence mf-ePRACH, from a sign-on, eNB is not in mf-ePRACH sub-frame configurationLBT gap, alternatively, if UE can obtain LBT gap positional information according to C-PDCCH, in LBT gap subframesMf-ePRACH is from second sign-on.
Random access procedure is described as follows:
Step 401, user reads the broadcast message that base station is sent, and obtains periodic PRACH resource distributions.
Step 402, the cycle in PRACH resource distributions and window information, user in random access windowOne available subframe carries out LBT detections.
Step 403, if LBT testing results show to allow signal to transmit, user then sends accidental access signal.
Step 404, if LBT testing results show not allow signal transmission and next subframe is still in window phase, useFamily then waits next available subframe in random access window to do LBT detections again, until window LBT detects successfully to enterEnter step 403.
Step 405, if LBT testing results show not allow signal transmission and next subframe is not in window phase, useFamily then waits next Stochastic accessing cycle.
Embodiment two：PRACH based on C-PDCCH instructions
UE can confirm sPUCCH position after C-PDCCH is read, according to the configuration of mf-sPRACH frequency domain resource (i.e.Aperiodic PRACH resources in system message), mf-sPRACH is sent in sPUCCH.In order to reach the purpose of UE power savings, UEC-PDCCH can be only detected within the specific period, such as is configured with PRACH periodic windows, in DRS windows, PagingIn window.
The preferred embodiment of the application is the foregoing is only, not limiting the application, all essences in the applicationGod and any modification within principle, made, equivalent substitution, improve etc., it should be included within the protection domain of the application.
Mobile communication particular technique described in the present invention is unlimited, can be WCDMA, CDMA2000, TD-SCDMA,WiMAX, LTE/LTE-A, LAA, MulteFire and the 5th generation being subsequently likely to occur, the 6th generation, N-Generation mobile communication skillArt
Terminal described in the present invention, refer to the end side product for the communication protocol that can support land mobile communication system,The modem module (Wireless Modem) of special communication, it can be various types of by mobile phone, tablet personal computer, data card etc.The terminal form of type is integrated so as to complete communication function
For convenience of description, using forth generation GSM LTE/LTE-A and its derivative MulteFire as actExample, wherein mobile communication terminal is expressed as UE (User Equipment), and access device is expressed as base station or access point AP.
Term is explained：