CN102264150B

CN102264150B - PRACH transmission methods and device in carrier aggregation

Info

Publication number: CN102264150B
Application number: CN201110218173.7A
Authority: CN
Inventors: 吴欣; 戴博; 喻斌
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2011-08-01
Filing date: 2011-08-01
Publication date: 2018-01-02
Anticipated expiration: 2031-08-01
Also published as: CN102264150A; WO2012155693A1

Abstract

The invention discloses the PRACH transmission methods in a kind of carrier aggregation and device, including：UE sends PRACH in auxiliary serving cell；UE receives the random access procedure message 2 of base station transmission in auxiliary serving cell；UE sends random access procedure message 3 to base station after random access procedure message 2 is received in auxiliary serving cell；UE receives the random access procedure message 4 that base station is sent by auxiliary serving cell.By the present invention, solve the problems, such as that prior art can not transmit PRACH under carrier aggregation scene in auxiliary serving cell, and then under carrier aggregation scene, realize the effect that PRACH is transmitted in auxiliary serving cell.

Description

PRACH transmission methods and device in carrier aggregation

Technical field

The present invention relates to the communications field, in particular to the Physical Random Access Channel in a kind of carrier aggregation (Physical Random Access Channel, PRACH) transmission method and device.

Background technology

Radio frames (Radio Frame, RF) in Long Term Evolution (Long Term Evolution, LTE) system include frequency Divide duplexing (Frequency Division Duplex, FDD) pattern and time division duplex (Time Division Duplex, TDD) The frame structure of pattern.

Fig. 1 is the frame structure schematic diagram of fdd mode in the prior art, as shown in figure 1, the radio frames of a 10ms (millisecond) By 20 length be 0.5ms, numbering 0~19 slot (time slot) form, time slot 2i and 2i+1 form length for 1ms subframe (subframe)i。

Fig. 2 is the frame structure schematic diagram of tdd mode in the prior art, as shown in Fig. 2 10ms radio frames are by two A length of 5ms field (half frame) composition, a field include the subframe that 5 length are 1ms, and subframe i is defined as two A length of 0.5ms time slot 2i and 2i+1.

In above two frame structure, for standard cyclic prefix (Normal Cyclic Prefix, Normal CP), One time slot includes the symbol that 7 length are 66.7us (microsecond), wherein, the CP length of first symbol is 5.21us, and remaining 6 The CP length of individual symbol is 4.69us；For extended cyclic prefix (Extended Cyclic Prefix, Extended CP), One time slot includes 6 symbols, and the CP length of all symbols is 16.67us.

Stochastic accessing (Random Access) is user equipment (User Equipment, UE) in beginning and network service Access procedure before.The process of Stochastic accessing can be divided into two types：The random access procedure of competition and it is non-competing with Machine access procedure.The random access procedure of competition refers to that UE concentrates random selection in the available public random access sequence of cell One sequence is launched in a manner of competing, therefore there is a possibility that collision conflict, need to carry out hit-treatment；Non-competing is random Access procedure refers to from base station that directly to UE one random access sequence of distribution this sequence is not in the public Stochastic accessing sequence of cell Row are concentrated, therefore in the absence of the possibility of collision.

For in LTE system Physical Random Access Channel (Physical Random Access Channel, PRACH, It is referred to as Stochastic accessing chance (Random Access Opportunity) or random access resource (Random Access Resource)), a RACH corresponds to a random access guiding (Random Access Preamble), with Machine access lead is made up of cyclic prefix (Cyclic Prefix, CP) and sequence (Sequence) two parts.Different connects at random Entering leading form (Preamble Format) means different CP and/or Sequence length.At present, TDD in LTE system The species for the leading form that pattern is supported is as shown in table 1 below.

Leading form	T_CP	T_SEQ
			0	3168·T_s	24576·T_s
1	21024·T_s	24576·T_s
			2	6240·T_s	2·24576·T_s
3	21024·T_s	2·24576·T_s
			4 (only for the frame structures of tdd mode)	448·T_s	4096·T_s

Table 1

T in above-mentioned table 1_CPRepresent CP length, T_SEQRepresent Sequence length, T_SValue be T_s=1/ (15000 × 2048) second.In the random access guiding form shown in table 1, preamble format 0~3 are passed in generic uplink subframe It is defeated, and preamble format 4 are transmitted in uplink pilot time slot (Uplink Pilot Time Slot, UpPTS). Specific transmission means is as follows：Preamble format 0 are transmitted in a generic uplink subframe；preamble format 1、 2 transmit in two generic uplink subframes；Preamble format 3 are transmitted in three generic uplink subframes；preamble Format4 is transmitted in UpPTS.

In frequency domain, a random access guiding accounts for the bandwidth corresponding to 6 resource blocks (Resource Block, RB), i.e., 72 resource elements (Resource Element, RE), each RE a width of 15kHz of band.Time-domain position identical PRACH channels Made a distinction by frequency domain.

Following three kinds of downlink physical control channels defined in LTE：Physical down control format instruction channel (Physical Control Format Indicator Channel, PCFICH), physical hybrid automatic repeat request indicator channel (Physical Hybrid Automatic Retransmission Request Indicator Channel, PHICH), thing Manage down control channel (Physical Downlink Control Channel, PDCCH).

PDCCH is used for bearing downlink control channel information (Downlink Control Information, DCI), including： Uplink and downlink schedule information, and uplink power control information.DCI form (DCI format) is divided into following several：DCI format0、DCI format 1、DCI format 1A、DCI format 1B、DCI format 1C、DCI format 1D、 DCI format2, DCI format 2A, DCI format 3 and DCI format 3A etc..

Wherein：

DCI format 0 be used for indicate Physical Uplink Shared Channel (Physical Uplink Shared Channel, PUSCH scheduling)；

DCI format 1、DCI format 1A、DCI format 1B、DCI format 1C、DCI format 1D For the scheduling of a Physical Downlink Shared Channel (Physical Downlink Shared Channel, PDSCH) code word not Same pattern；

DCI format 2, DCI format 2A, DCI format 2B are used for the different mode of space division multiplexing；

DCI format 3, DCI format 3A are used for Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel) and PUSCH power control instruction different mode.

PDCCH transmission physical resource with control channel element (Control Channel Element, CCE) for unit, One CCE size is 9 resource element groups (Resource Element Group, REG), i.e. 36 RE, and a PDCCH can 1,2,4 or 8 CCE can be taken.These four PDCCH sizes for taking 1,2,4,8 CCE, using tree-shaped polymerization (Aggregation) PDCCH for, that is, taking 1 CCE can be since any CCE positions；2 CCE PDCCH is taken from idol Number CCE positions start；4 CCE PDCCH is taken since the CCE positions of 4 integral multiple；8 CCE PDCCH is taken from 8 The CCE positions of integral multiple start.

Each aggregation level (Aggregation level) defines a search space (Search space), including public affairs The search space of (common) and UE proprietary (UE-Specific) search space altogether.The CCE numbers of whole search space are by every OFDM (the Orthogonal Frequency shared by control zone that PCFICH is indicated in individual descending sub frame Division Multiplexing, OFDM) symbolic number and PHICH group number determines.UE is in search space by residing transmission mould The DCIformat of formula carries out blind Detecting to all possible PDCCH code checks.

In non-competing random access procedure, base station sends preamble index (Preamble by DCI format 1A Index) and Physical Random Access Channel mask indexes information such as (PRACH Mask Index).If UE is arranged to use by high level Random access radio network temporary mark (Random Access Radio Network Temporary Identifier, RA- RNTI) CRC (Cyclical Redundancy Check, CRC) of scrambling carries out PDCCH decodings, then UE should When decoding PDCCH and all related PDSCH according to the respective combination defined in table 2 below.

Table 2

If UE is arranged to use Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (Cell Radio Network Temporary by high level Identifier, C-RNTI) CRC of scrambling carries out PDCCH decodings, then and UE should be according to the respective combination defined in table 3 below To decode PDCCH and all related PDSCH.

Table 3

In advanced LTE (LTE-Advance) system, because LTE-Advanced networks are required to access LTE use Family, therefore its operational frequency bands needs to cover current LTE frequency bands.And it has been not present on current LTE frequency bands assignable Continuous 100MHz spectral bandwidth, so the technical problem that LTE-Advanced needs to solve is exactly：By several distributions Continuous component carrier (frequency spectrum) (Component Carrier, CC) on different frequency bands uses carrier aggregation (Carrier Aggregation, CA) technology is aggregating, form the 100MHz bandwidth that LTE-Advanced can be used.After i.e. for aggregation Frequency spectrum, be divided into n component carrier (frequency spectrum), and the frequency spectrum in each component carrier (frequency spectrum) is continuous.LTE-A The schematic diagram of system carrier aggregation is as shown in Figure 3.

In the prior art, under CA scenes, if multiple component carriers polymerize, then just need one of them point Loading gage ripple is defined as principal component carrier wave (Primary Component Carrier, PCC), supplemented by remaining component carrier definition Component carrier (Secondary Component Carrier, SCC).In addition, component carrier is further referred to as serving cell (Serving Cell), and principal component carrier wave can be referred to as main serving cell (Primary Serving Cell, Pcell), Auxiliary component carrier can be referred to as auxiliary serving cell (Secondary Serving Cell, Scell).

At present, Physical Random Access Channel can only transmit in main serving cell.However, due to (inter- in bandwidth Band) the application of TDDCA scenes so that will be used under multiple scenes long distance wireless head (Remote Radio Heads, RRH) and repeating device (Repeater), there is an urgent need to can in auxiliary serving cell transmitting physical random access channel.Therefore, such as Where transmitting physical random access channel turns into a urgent problem to be solved in auxiliary serving cell.

The content of the invention

It is a primary object of the present invention to provide PRACH transmission methods and device in a kind of carrier aggregation, at least to solve It is certainly above-mentioned in the prior art, under carrier aggregation scene, can not in auxiliary serving cell transmit PRACH the problem of.

According to an aspect of the invention, there is provided the PRACH transmission methods in a kind of carrier aggregation, including：UE is auxiliary PRACH is sent on serving cell；UE receives the random access procedure message 2 of base station transmission in auxiliary serving cell；UE is being received To after random access procedure message 2, random access procedure message 3 is sent in auxiliary serving cell to base station；UE receives base station and led to Cross the random access procedure message 4 of auxiliary serving cell transmission.

Preferably, UE includes in the step of transmission PRACH in auxiliary serving cell：UE receives the Stochastic accessing of base station transmission Message is triggered, triggering UE randomly chooses random access leader sequence, or, UE does not need Stochastic accessing triggering message, random choosing Select random access leader sequence；UE transmits PRACH according to the random access leader sequence of selection in auxiliary serving cell.

Preferably, UE only receives the random access procedure message 2 that base station is sent in transmission PRACH auxiliary serving cell.

Preferably, under Stochastic accessing triggering message passes through main serving cell by base station high-level signaling or main serving cell Row control channel information, or, by the downlink control channel information of auxiliary serving cell, it is sent to UE.

Preferably, the high-level signaling of main serving cell or the downlink control channel information of main serving cell include PRACH The uplink service cell index at place.

Preferably, the uplink service cell index where PRACH is located at：In the downlink control channel information of main serving cell In the CIF of addition；Or in the descending control signaling in the downlink control channel information of main serving cell.

Preferably, also include in the downlink control channel information of main serving cell：Preamble index and PRACH masks index.

Preferably, UE is according to the random access leader sequence of selection, and transmission PARCH includes in auxiliary serving cell：UE exists PRACH is transmitted on the serving cell indicated by the index of uplink service cell where PRACH.

Preferably, when Stochastic accessing triggering message is sent to by base station by the downlink control channel information of auxiliary serving cell During UE, UE transmits PRACH in auxiliary serving cell to be included：UE is small in the descending auxiliary service of the Stochastic accessing triggering message received On the uplink service cell of sound zone system message SIBX links, PRACH is sent.

Preferably, X value is 2 in SIBX.

Preferably, the auxiliary serving cell that base station sends random access procedure message 2 is transmission PRACH uplink service cell Corresponding downstream service cell, base station only send sent corresponding to PRACH uplink service cell in downstream service cell with Machine access procedure message 2.

Preferably, UE includes in the step of random access procedure message 2 that reception base station is sent in auxiliary serving cell：UE exists In the auxiliary serving cell for sending PRACH, the downlink control channel information of detection base station transmission；UE is sending PRACH auxiliary service In cell, according to preamble index corresponding to downlink control channel information and PRACH, detection random access procedure message 2.

Preferably, UE is in the auxiliary serving cell for sending PRACH, the step for the downlink control channel information that detection base station is sent Suddenly include：UE is in the auxiliary serving cell for sending PRACH, according to the random access radio network temporary mark RA-RNTI of configuration Detect the downlink control channel information that base station is sent.

Preferably, UE is detected under the transmission of base station in the auxiliary serving cell for sending PRACH according to the RA-RNTI of configuration The step of row control channel information, includes：UE is in the auxiliary serving cell for sending PRACH, according to the RA-RNTI of configuration, at one The downlink control channel information of publicly-owned search space and the descending control of the proprietary search space of user that base station is sent are detected in subframe Channel information processed；Or UE is in the auxiliary serving cell for sending PRACH, according to the RA-RNTI of configuration, in a subframe only The downlink control channel information of publicly-owned search space is detected, the proprietary search of the auxiliary serving cell is only detected in another subframe The downlink control channel information in space.

Preferably, UE receives the random access procedure message 4 that base station is sent by the auxiliary serving cell and included：UE according to The downlink control channel information detected in main serving cell, or, according to the descending control detected in auxiliary serving cell Channel information processed, the random access procedure message 4 that detection base station is transmitted by auxiliary serving cell.

Preferably, UE detects downlink control channel information in main serving cell and included：UE in main serving cell, according to Temporary Cell Radio Network temporary mark or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, the down control channel letter that detection base station is sent Breath.

Preferably, CIF is included in the downlink control channel information that UE is detected in main serving cell, for indicating downlink Serving cell corresponding to control channel information.

Preferably, UE detects downlink control channel information in auxiliary serving cell and included：UE in auxiliary serving cell, according to Temporary Cell Radio Network temporary mark or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, the down control channel letter that detection base station is sent Breath.

According to another aspect of the present invention, there is provided the PRACH transmitting devices in a kind of carrier aggregation, be arranged at mobile whole In end, the device includes：Transport module, for transmitting PRACH in auxiliary serving cell；First receiving module, in auxiliary clothes The random access procedure message 2 that base station is sent is received in cell of being engaged in；First sending module, for receiving random access procedure After message 2, random access procedure message 3 is sent in auxiliary serving cell to base station；Second receiving module, lead to for receiving base station Cross the random access procedure message 4 of auxiliary serving cell transmission.

Preferably, transport module is used for after the Stochastic accessing triggering message of base station transmission is received, triggering PRACH transmission Device randomly chooses random access leader sequence, or, it is not necessary to Stochastic accessing triggers message, randomly chooses random access guiding Sequence；According to the random access leader sequence of selection, PRACH is transmitted in auxiliary serving cell.

Preferably, under Stochastic accessing triggering message passes through main serving cell by base station high-level signaling or main serving cell Row control channel information, or, mobile terminal is sent to by the downlink control channel information of auxiliary serving cell.

Preferably, the high-level signaling of main serving cell or the downlink control channel information of main serving cell include stating The information of uplink service cell index where PRACH.

Preferably, the uplink service cell rope where the PRACH included in the downlink control channel information of main serving cell The information drawn is arranged in the carrier wave instructions field CIF added in the downlink control channel information, or, it is arranged at the descending control In descending control signaling in channel information.

By the present invention, Stochastic accessing triggering message is sent using by base station, UE disappears receiving Stochastic accessing triggering After breath, random access procedure is triggered, and message selection random access leader sequence is triggered according to the Stochastic accessing, or, UE is certainly Row random selection random access leader sequence, PRACH is transmitted according to the random access leader sequence of selection in auxiliary serving cell, And then by the transmitting-receiving and processing to random access procedure message 2,3 and 4, solves prior art nothing under carrier aggregation scene Method transmits PRACH in auxiliary serving cell, the problem of being based especially on the transmission PRACH of competition, and then gathers in carrier wave Close under scene, realize the effect that PRACH is transmitted in auxiliary serving cell.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the frame structure schematic diagram according to a kind of fdd mode of correlation technique；

Fig. 2 is the frame structure schematic diagram according to a kind of tdd mode of correlation technique；

Fig. 3 is a kind of lte-a system carrier aggregation schematic diagram according to correlation technique；

Fig. 4 is the step flow chart of the PRACH transmission methods in a kind of according to embodiments of the present invention one carrier aggregation；

Fig. 5 is the step flow chart of the PRACH transmission methods in a kind of according to embodiments of the present invention two carrier aggregation；

Fig. 6 is the structured flowchart of the PRACH transmitting devices in a kind of according to embodiments of the present invention seven carrier aggregation；

Fig. 7 is a kind of structured flowchart of according to embodiments of the present invention eight mobile terminal.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting In the case of, the feature in embodiment and embodiment in the application can be mutually combined.

Embodiment one

Reference picture 4, the step of showing the PRACH transmission methods in a kind of according to embodiments of the present invention one carrier aggregation Flow chart.

PRACH transmission methods in the carrier aggregation of the present embodiment comprise the following steps：

Step S102：UE sends PRACH in auxiliary serving cell.

In this step, Stochastic accessing that UE can be sent according to the base station that receives triggers message, triggering random selection with Machine access lead sequence, or, UE do not need Stochastic accessing triggering message, randomly choose random access leader sequence, and according to The random access leader sequence of selection, sends PRACH in auxiliary serving cell.

In this step, UE receives the Stochastic accessing triggering message of base station transmission, and triggering UE enters random access procedure, root According to Stochastic accessing triggering message selection random access leader sequence.On the one hand, base station sends Stochastic accessing by main serving cell Message is triggered to UE, wherein the information that instruction UE sends PRACH auxiliary serving cell can be carried, UE is receiving the triggering After message, according to the instruction in triggering message, PRACH is sent in corresponding auxiliary serving cell；On the other hand, base station passes through auxiliary Serving cell sends Stochastic accessing triggering message and is receiving the descending auxiliary serving cell of Stochastic accessing triggering message to UE, UE On the uplink service cell of SIBX links, the PRACH is sent.、

Or in the case of not sending Stochastic accessing triggering message in base station, UE random selection random access leader sequences, Trigger random access procedure.

Step S104：UE receives the random access procedure message 2 of base station transmission in auxiliary serving cell.

In this step, it is preferable that base station, which is fixed in auxiliary serving cell, sends random access procedure message 2 (that is, in agreement Message 2).

Step S106：UE sends random access procedure after random access procedure message 2 is received in auxiliary serving cell Message 3 gives base station.

Wherein, random access procedure message 3 is the Message 3 in agreement.

Step S108：UE receives the random access procedure message 4 that base station is sent by auxiliary serving cell.

In this step, base station sends random access procedure after the random access procedure message 3 of UE transmissions is received, to UE and disappeared Cease 4 (Message 4 i.e. in agreement).

By random access procedure message 3 and 4, realize based under carrier aggregation scene, the base in auxiliary serving cell In the PRACH of competition transmission.

In correlation technique, under carrier aggregation scene, it can not realize and PRACH is transmitted in auxiliary serving cell.By this reality Example is applied, message trigger random access procedure is triggered using Stochastic accessing, randomly chooses random access leader sequence, or, UE is certainly Row random selection random access leader sequence, sends corresponding to the random access leader sequence in selection in auxiliary serving cell PRACH, and then by the transmitting-receiving and processing to random access procedure message 2,3 and 4, gather so as to solve prior art in carrier wave PRACH can not be transmitted under scene in auxiliary serving cell by closing, the problem of being based especially on the transmission PRACH of competition, and then be realized PRACH effect is sent under carrier aggregation scene in auxiliary serving cell.

Embodiment two

Reference picture 5, the step of showing the PRACH transmission methods in a kind of according to embodiments of the present invention two carrier aggregation Flow chart.The PRACH transmission methods of the present embodiment are based on competition mechanism, are a kind of transmission method of the PRACH based on competition.

Step S202：UE selects random access leader sequence.

In this step, before UE sends PRACH, random access leader sequence is first selected.Select random access leader sequence Mode can be：Base station sends Stochastic accessing by main serving cell or auxiliary serving cell and triggers message to UE, Jin Eryou UE randomly chooses random access leader sequence；Can also be will not be sent in base station Stochastic accessing triggering message in the case of, by UE randomly selects random access leader sequence.Wherein, it is random by UE in the case of not sending Stochastic accessing triggering message in base station Random access leader sequence is chosen, realizes the carrier aggregation scene PRACH under no Stochastic accessing triggering message scenarios in auxiliary clothes Transmission in cell of being engaged in, extend the applicable scene of the PRACH delivery plans of the present invention.

In the case of Stochastic accessing triggering message is sent in base station, base station can be small by main serving cell or auxiliary service Area sends Stochastic accessing triggering message.

(1) when base station sends Stochastic accessing by main serving cell triggers message to UE

Base station sends Stochastic accessing triggering by the high-level signaling in main serving cell or downlink control channel information and disappeared Cease to UE.Wherein, the high-level signaling of the main serving cell or downlink control channel information include the up clothes where PRACH Business cell index.Stochastic accessing is sent by high-level signaling or downlink control channel information and triggers message to UE；Also, pass through High-level signaling or downlink control channel information carry the uplink service cell index where PRACH, fast can refer to exactly Show that UE sends PRACH auxiliary serving cell.

Preferably, the uplink service cell rope where the downlink control channel information of main serving cell includes PRACH When drawing, the uplink service cell index where the PRACH is located at the carrier wave instructions field added in the downlink control channel information (CIF) in；Or in the descending control signaling in the downlink control channel information.

Preferably, also include in the downlink control channel information：Preamble index and Physical Random Access Channel (PRACH) are covered Code index.

UE selects up clothes corresponding to uplink service cell index therein after the downlink control channel information is received Business cell sends PRACH.

(2) when base station sends Stochastic accessing by auxiliary serving cell triggers message to UE

Base station sends Stochastic accessing by the downlink control channel information in auxiliary serving cell and triggers message to UE.

Step S204：Under the scene of carrier aggregation, UE transmitting physical random access channels in auxiliary serving cell.

In this step, when base station is sent at random by the high-level signaling in main serving cell or downlink control channel information Access triggers message to UE, and, the high-level signaling or downlink control channel information of the main serving cell include PRACH places Uplink service cell index when, UE is sent on the indicated serving cell of the uplink service cell index where PRACH PRACH；When base station sends Stochastic accessing by the downlink control channel information in auxiliary serving cell triggers message to UE, UE exists Receive the upper of descending auxiliary serving cell SIBX (the System Information Bit X) links of Stochastic accessing triggering message On row serving cell, PRACH is sent.Preferably, X value is 2.Triggered when base station sends Stochastic accessing by auxiliary serving cell During message, the descending auxiliary serving cell SIBX that UE triggers message by Stochastic accessing knows that its transmission PRACH upstream service is small Area, simplify in such cases, the implementation process that PRACH transmits in auxiliary serving cell, and can quickly and easily realize auxiliary clothes The transmission of PRACH in cell of being engaged in.

When base station does not send Stochastic accessing triggering message, UE randomly selects random access leader sequence, and random at this Corresponding to access lead sequence PRACH is sent in auxiliary serving cell.

Step S206：Base station only sends random access procedure message 2 to UE in auxiliary serving cell.

In this step, base station is fixed on downstream service cell corresponding to the uplink service cell for sending PRACH, sends random Access procedure message 2 gives UE.

By sending random access procedure message 2 to UE, UE can be made to obtain the information needed for random access procedure in time And resource, to be smoothed out Stochastic accessing.

Step S208：The downlink control channel information of UE detections this transmission of base station, and then according to the down control channel Infomation detection random access procedure message 2.

In this step, UE first detects downlink control channel information when sending random access procedure message 2.Then, UE exists In auxiliary serving cell, Stochastic accessing is detected according to preamble index corresponding to the downlink control channel information and the PRACH sent Procedure message 2.

Preferably, UE detects this downlink control channel information sent of base station and included：UE bases in auxiliary serving cell The RA-RNTI of configuration come detect base station this send downlink control channel information.

Preferably, UE detects the descending control of this transmission of base station in auxiliary serving cell according to the RA-RNTI of configuration Channel information includes：In a subframe, UE detects the downlink control channel information of publicly-owned search space in auxiliary serving cell With the downlink control channel information of the proprietary search space of user；Or UE is in auxiliary serving cell, wherein in a subframe only The downlink control channel information of publicly-owned search space is detected, only the proprietary search of detection auxiliary serving cell is empty in another subframe Between downlink control channel information.

Step S210：UE sends random access procedure after random access procedure message 2 is received in auxiliary serving cell Message 3 gives base station.

Preferably, in this step, UE sends random access procedure message 3 to base in the auxiliary serving cell for sending PRACH Stand.

Step S212：Base station sends random access procedure message 4 to UE by auxiliary serving cell.

Preferably, in this step, base station is being sent corresponding to PRACH uplink service cell in downstream service cell, hair Random access procedure message 4 is sent, is connect at random that is, base station is sent in the auxiliary serving cell for sending random access procedure message 2 Enter procedure message 4.

By random access procedure message 3 and 4, the conflict and competition between multiple UE are efficiently solved.

Step S214：The downlink control channel information of UE detections this transmission of base station, and believed according to the down control channel Breath detects random access procedure message 4 in auxiliary serving cell.

Preferably, carrier wave instructions field (CIF) is included in the downlink control channel information that this sends, for indicating downlink control Serving cell corresponding to channel information processed.

In this step, UE can also detect this transmission of base station in main serving cell in auxiliary serving cell Downlink control channel information.

Preferably, when UE in main serving cell detect base station this send downlink control channel information when, UE according to Temporary Cell Radio Network temporary mark (Temporary C-RNTI) or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) come Detect the downlink control channel information of this transmission of base station.

Then, UE detects random access procedure message 4 according to the downlink control channel information in auxiliary serving cell.It is preferred that Ground, the auxiliary serving cell of UE detection random access procedures message 4 send PRACH auxiliary serving cell for UE.

Pass through the present embodiment, there is provided a kind of PRACH transmission methods based on competition, under the scene of carrier aggregation, UE The transmitting physical random access channel in auxiliary serving cell；Base station is fixed on transmission random access procedure message in auxiliary serving cell 2 give UE；UE sends random access procedure message 3 to base after random access procedure message 2 is received in auxiliary serving cell Stand；Base station sends random access procedure message 4 to UE by auxiliary serving cell.By random access procedure message 2, UE can and When know information needed and resource；By random access procedure message 3 and 4, the competition conflict between multiple UE is efficiently solved, from And by the present embodiment, effectively realize under the scene of carrier aggregation, in auxiliary serving cell, the PRACH's based on competition Transmission.

Embodiment three

In the present embodiment, under the scene of carrier aggregation, the transmission for the PRACH of competition, base station is in auxiliary serving cell On, Stochastic accessing is sent by downlink control channel information and triggers message to UE, to trigger random access procedure.Wherein, under this Row control channel information includes the information of the uplink service cell index where PRACH.

Step S302：UE receives the Stochastic accessing triggering message that base station is sent, and random access procedure is triggered, according to connecing at random Enter to trigger message selection random access leader sequence.

Wherein, Stochastic accessing triggering message, also referred to as random access procedure message 0, it is as follows that it triggers random access procedure：

(1) UE detects base station in main serving cell this is sent to UE downlink control channel information, i.e. Stochastic accessing Message is triggered, to trigger random access procedure.

Wherein, the one of which configured below is needed in downlink control channel information, that is, configures one：In descending control CIF is added in channel information to indicate serving cell；Configuration two：Indicated by the control signaling in downlink control channel information Serving cell.

When to configure one, i.e., when adding CIF in downlink control channel information to indicate serving cell, base station is in auxiliary service The downlink control channel information that cell is sent, is detected by UE in main serving cell.Wherein, in downlink control channel information CIF is added, to indicate the uplink service cell index where Physical Random Access Channel (PRACH).The CIF has following features： CIF includes n-bit, and for serving cell corresponding to indicating downlink control channel information, n preferred value is 3.

It should be noted that when UE is arranged to detect the downlink control channel information containing CIF, it needs to detect The proprietary search space of user.

Now, downlink control channel information is carried by DCI format 1A, when DCI format 1A are used at random Access procedure and with down control channel order (PDCCH order) to initialize when, base station will pass through DCI format 1A To send Preamble Index and PRACH Mask Index to UE.

UE knows triggering random access procedure by the downlink control channel information in the DCI format 1A that detect Uplink service cell.In this case, downlink control channel information includes CIF value, Preamble Index and PRACH Mask Index, and UE sends Physical Random Access Channel (PRACH) on the uplink service cell.

When for configuration two, i.e., during by the control signaling in downlink control channel information to indicate serving cell, base station exists The downlink control channel information that auxiliary serving cell is sent, is detected by UE in main serving cell.Downlink control channel information Carried by DCIformat 1A, when DCI format 1A are used for random access procedure and with PDCCH order come initial During change, base station will send Preamble Index and PRACH Mask Index to UE by DCI format 1A.

In DCI format 1A, the up clothes where Physical Random Access Channel (PRACH) are indicated using n-bit Business cell index.Wherein, n preferred value is 3.Can be by DCI format 1A, being reserved in resource allocation information bit Several states, to indicate that uplink service cell indexes.

UE knows triggering random access procedure by the downlink control channel information in the DCI format 1A that detect Uplink service cell, downlink control channel information include be used for indicate uplink service cell index control signaling, Preamble Index and PRACH Mask Index, and UE sends Physical Random Access Channel on the uplink service cell (PRACH)。

(2) UE detects the downlink control channel information that base station is sent to UE in auxiliary serving cell, to trigger Stochastic accessing Process.

Now, base station is sent to UE downlink control channel information, is detected by UE in auxiliary serving cell.Descending control Channel information processed is carried by DCI format 1A, when DCI format 1A are used for random access procedure and use PDCCH When order is to initialize, base station will send Preamble Index and PRACH Mask Index by DCI format 1A To UE.

UE is come by the downlink control channel information included in the DCI format 1A that are detected in auxiliary serving cell Stochastic accessing triggering message is obtained, UE is receiving the up of the descending auxiliary serving cell SIBX links of Stochastic accessing triggering message Physical Random Access Channel is sent on serving cell.Wherein, X preferred value is 2.

It should be noted that Physical Random Access Channel (PRACH), also referred to as physical accidental access message 1.

Step S304：UE sends PRACH according to the random access leader sequence of selection in auxiliary serving cell.

Step S306：UE send Physical Random Access Channel after, base station be fixed in auxiliary serving cell send physics with Machine access procedure message 2 (Message 2) gives UE.

Auxiliary serving cell in this step is：Send descending clothes corresponding to the uplink service cell of Physical Random Access Channel Business cell.

Step S308：The downlink control channel information of UE detections this transmission of base station.

In this step, the specific method of this downlink control channel information sent of UE detections base station is as follows：

UE is according to the RA-RNTI of configuration, in auxiliary serving cell, as the CRC that UE is arranged to be scrambled with RA-RNTI by high level During carrying out PDCCH decodings, UE decodes PDCCH and all related PDSCH according to the respective combination defined in table 2.Wherein, The RA-RNTI of each serving cell configuration is identical, and the configuration includes：Configuration one：In a certain subframe, UE is in auxiliary serving cell The downlink control channel information of publicly-owned search space should be detected, also to detect the down control channel of the proprietary search space of user Information；Configuration two：In a certain subframe, UE only detects the down control channel letter of publicly-owned search space in auxiliary serving cell Breath, the downlink control channel information of proprietary search space is detected in another subframe.

Configuration one is configured to when serving cell, i.e., in a certain subframe, UE should detect publicly-owned in auxiliary serving cell The downlink control channel information of search space, when also detecting the downlink control channel information of the proprietary search space of user, UE exists In auxiliary serving cell, DCI format1A or DCI format 1C are detected in publicly-owned search space, are sent for receiving base station Message 2, while corresponding DCI format are detected in the proprietary search space of user, for receiving instruction other lower line numbers According to schedule information.

Correspondingly, UE is arranged to carry out PDCCH decodings with the CRC of RA-RNTI scramblings by high level, and UE is according to fixed in table 2 The respective combination of justice decodes PDCCH and all related PDSCH.Meanwhile UE is also arranged to C-RNTI scramblings by high level CRC carries out PDCCH decodings, and UE also can decode PDCCH and all related PDSCH according to the respective combination defined in table 3.

Configuration two is configured to when serving cell, i.e., in a certain subframe, UE only detects publicly-owned search in auxiliary serving cell During the downlink control channel information in rope space, UE is in auxiliary serving cell, only in publicly-owned search space detection DCI format1A Or DCIformat 1C, for receiving the Message 2 of base station transmission.Then, proprietary search is detected in another subframe The downlink control channel information in space.

Correspondingly, UE is arranged to carry out PDCCH decodings with the CRC of RA-RNTI scramblings by high level, and UE is according to fixed in table 2 The respective combination of justice decodes PDCCH and all related PDSCH.

After UE is detecting downlink control channel information in auxiliary serving cell, UE according to the downlink control channel information and Preamble index corresponding to the Physical Random Access Channel of transmission detects random access procedure message Message 2.

Step S310：UE receive base station transmission random access procedure message 2 after, in auxiliary serving cell send with Machine access procedure message 3 gives base station,

In this step, UE can send random access procedure in the auxiliary serving cell for sending Physical Random Access Channel and disappear Breath 3 gives base station.

Step S312：Base station is sending downstream service cell corresponding to the uplink service cell of Physical Random Access Channel On, random access procedure message 4 is sent to UE.

Step S314：UE detects down control channel letter according to interim C-RNTI or C-RNTI in main serving cell Breath.

Wherein, the downlink control channel information includes carrier wave instructions field, for indicating the downlink control channel information pair The serving cell answered.

Step S316：UE will detect base station transmission according to the downlink control channel information detected in auxiliary serving cell Random access procedure message 4.

By the present embodiment, realize under the scene of carrier aggregation, the auxiliary serving cell physical accidental based on competition connects Enter the transmission of channel.

Example IV

In the present embodiment, under the scene of carrier aggregation, the transmission for the Physical Random Access Channel of competition, base station exists In auxiliary serving cell, random access leader sequence is randomly selected by UE to trigger random access procedure.

Step S402：UE sends Physical Random Access Channel to base station in auxiliary serving cell.

In this step, UE random selection random access leader sequences, and in auxiliary service corresponding to random access leader sequence PRACH is sent in cell.

Step S404：UE send Physical Random Access Channel after, base station be fixed in auxiliary serving cell send physics with Machine access procedure message 2 (Message 2) gives UE.

Wherein, the auxiliary serving cell in this step is：Corresponding to the uplink service cell for sending Physical Random Access Channel Downstream service cell.

Step S406：The downlink control channel information of UE detections this transmission of base station.

UE is according to the RA-RNTI of configuration, in auxiliary serving cell, as the CRC that UE is arranged to be scrambled with RA-RNTI by high level During carrying out PDCCH decodings, UE should decode PDCCH and all related PDSCH according to the respective combination defined in table 2. Wherein, the RA-RNTI of each serving cell configuration is identical, and the configuration can be configuration one：In a certain subframe, UE is in auxiliary service The downlink control channel information of publicly-owned search space should be detected in cell, also to detect the descending control of the proprietary search space of user Channel information processed；Or it is configuration two：In a certain subframe, UE is only detected under publicly-owned search space in auxiliary serving cell Row control channel information, then, the downlink control channel information of proprietary search space is detected in another subframe.

When to configure one, i.e., in a certain subframe, UE should detect the descending of publicly-owned search space in auxiliary serving cell Control channel information, when also detecting the downlink control channel information of the proprietary search space of user, UE in auxiliary serving cell, DCI format1A or DCI format 1C are detected in publicly-owned search space, for receiving the Message 2 of base station transmission, together When in the proprietary search space of user detect corresponding DCI format, the schedule information of other downlink datas is indicated for receiving.

Correspondingly, UE is arranged to carry out PDCCH decodings with the CRC of RA-RNTI scramblings by high level, and UE should be according to table 2 Defined in respective combination decode PDCCH and all related PDSCH.Meanwhile UE also is arranged to be added with C-RNTI by high level The CRC disturbed carries out PDCCH decodings, UE also can according to the respective combination defined in table 3 come decode PDCCH to it is all related PDSCH。

When to configure two, i.e., in a certain subframe, UE only detects the descending control of publicly-owned search space in auxiliary serving cell Channel information processed, when detecting the downlink control channel information of proprietary search space in another subframe, UE is first small in auxiliary service Qu Shang, DCI format1A or DCI format 1C only are detected in publicly-owned search space, for receiving base station transmission Message 2；Then, the downlink control channel information of proprietary search space is detected in another subframe.

Correspondingly, UE is arranged to carry out PDCCH decodings with the CRC of RA-RNTI scramblings by high level, and UE should be according to table 2 Defined in respective combination decode PDCCH and all related PDSCH.

After UE is detecting downlink control channel information in auxiliary serving cell, UE is according to downlink control channel information and hair Preamble index corresponding to the Physical Random Access Channel sent detects random access procedure message Message 2.

Step S408：UE receive base station transmission random access procedure message 2 after, in auxiliary serving cell send with Machine access procedure message 3 gives base station.

In this step, UE sends random access procedure message 3 in the auxiliary serving cell for sending Physical Random Access Channel To base station.

Step S410：Then, base station is sending downstream service corresponding to the uplink service cell of Physical Random Access Channel In cell, random access procedure message 4 is sent to UE.

Step S412：UE faces according to Temporary Cell Radio Network temporary mark (interim C-RNTI) or cell-radio network When identify (C-RNTI), downlink control channel information is detected in main serving cell.

Step S414：UE according to the downlink control channel information detected in auxiliary serving cell, detection base station send with Machine access procedure message 4.

Embodiment five

In the present embodiment, under the scene of carrier aggregation, the transmission for the Physical Random Access Channel of competition, base station exists In auxiliary serving cell, Stochastic accessing is sent by downlink control channel information and triggers message to UE, to trigger random access procedure. Wherein, the downlink control channel information includes the uplink service cell index where Physical Random Access Channel.

Step S502：UE receives the Stochastic accessing triggering message that base station is sent, and random access procedure is triggered, according to connecing at random Enter to trigger message selection random access leader sequence.

When to configure one, i.e., when adding CIF in downlink control channel information to indicate serving cell, base station is in auxiliary service The downlink control channel information that cell is sent, is detected by UE in main serving cell.Wherein, in downlink control channel information CIF is added, to indicate the uplink service cell index where Physical Random Access Channel.The CIF has following features：CIF bags Containing n-bit, for serving cell corresponding to indicating downlink control channel information, n preferred value is 3.

UE knows triggering random access procedure by the downlink control channel information in the DCI format 1A that detect Uplink service cell.In this case, downlink control channel information includes CIF value, Preamble Index and PRACH Mask Index, and UE sends Physical Random Access Channel on uplink service cell.

When for configuration two, i.e., during by the control signaling in downlink control channel information to indicate serving cell, base station exists The downlink control channel information sent in auxiliary serving cell, detected by UE in main serving cell.Down control channel is believed Breath carried by DCI format 1A, when DCI format 1A be used for random access procedure and with PDCCH order come During initialization, base station will send Preamble Index and PRACH Mask Index to UE by DCI format 1A.

In DCI format 1A, the upstream service where the Physical Random Access Channel is indicated using n-bit is small Area indexes.Wherein, n preferred value is 3.Can be by the way that in DCI format 1A, that is reserved in resource allocation information bit be several State, to indicate that serving cell indexes.

UE knows triggering random access procedure by the downlink control channel information in the DCI format 1A that detect Uplink service cell, downlink control channel information include be used for indicate uplink service cell index control signaling, Preamble Index and PRACH Mask Index, and UE sends Physical Random Access Channel on uplink service cell.

It should be noted that Physical Random Access Channel, also referred to as physical accidental access message 1.

Step S504：UE sends PRACH according to the random access leader sequence of selection in auxiliary serving cell.

Step S506：UE send Physical Random Access Channel after, base station be fixed in auxiliary serving cell send physics with Machine access procedure message 2 (Message 2) gives UE.

Wherein, the auxiliary serving cell is：Send descending clothes corresponding to the uplink service cell of Physical Random Access Channel Business cell.

Step S508：The downlink control channel information that UE detections base station is sent.

In this step, the specific method for the downlink control channel information that UE detections base station is sent is as follows：

UE is according to the RA-RNTI of configuration, in auxiliary serving cell, as the CRC that UE is arranged to be scrambled with RA-RNTI by high level During carrying out PDCCH decodings, UE should decode PDCCH and all related PDSCH according to the respective combination defined in table 2. Wherein, the RA-RNTI of each serving cell configuration is identical, and the configuration includes：Configuration one：In a certain subframe, UE is in auxiliary service The downlink control channel information of publicly-owned search space should be detected in cell, also to detect the descending control of the proprietary search space of user Channel information processed；Configuration two：In a certain subframe, UE only detects the descending control letter of publicly-owned search space in auxiliary serving cell Road information, the downlink control channel information of proprietary search space is detected in another subframe.

When being configured to configuration one, i.e., in a certain subframe, UE should detect publicly-owned search space in auxiliary serving cell Downlink control channel information, when also detecting the downlink control channel information of the proprietary search space of user, UE is in auxiliary serving cell On, DCI format1A or DCI format 1C are detected in publicly-owned search space, for receiving the Message of base station transmission 2, while corresponding DCI format are detected in the proprietary search space of user, the scheduling letter of other downlink datas is indicated for receiving Breath.

When being configured to configuration two, i.e., in a certain subframe, UE is only detected under publicly-owned search space in auxiliary serving cell During row control channel information, UE is in auxiliary serving cell, only in publicly-owned search space detection DCI format1A or DCI Format 1C, for receiving the Message 2 of base station transmission；Then, detected in another subframe under proprietary search space Row control channel information.

Step S510：UE receive base station transmission random access procedure message 2 after, in auxiliary serving cell send with Machine access procedure message 3 gives base station.

Step S512：Base station is sending downstream service cell corresponding to the uplink service cell of Physical Random Access Channel On, random access procedure message 4 is sent to UE.

Step S514：UE detects according to Temporary Cell Radio Network temporary mark or C-RNTI in auxiliary serving cell Downlink control channel information.

Step S516：UE sends random according to the downlink control channel information detected in auxiliary serving cell detection base station Access procedure message 4.

Embodiment six

In the present embodiment, under the scene of carrier aggregation, the transmission for the Physical Random Access Channel of competition, base station exists In auxiliary serving cell, Stochastic accessing triggering message is randomly selected by UE to trigger random access procedure.

Step S602：UE sends Physical Random Access Channel to base station in auxiliary serving cell.

Step S604：UE send Physical Random Access Channel after, base station be fixed in auxiliary serving cell send physics with Machine access procedure message 2 (Message 2) gives UE.

Wherein, the auxiliary serving cell of this step is：Under sending corresponding to the uplink service cell of Physical Random Access Channel Row serving cell.

Step S606：The downlink control channel information of UE detections this transmission of base station.

UE is according to the RA-RNTI of configuration, in auxiliary serving cell, as the CRC that UE is arranged to be scrambled with RA-RNTI by high level During carrying out PDCCH decodings, UE should decode PDCCH and all related PDSCH according to the respective combination defined in table 2. Wherein, the RA-RNTI of each serving cell configuration is identical, and the configuration can be configuration one：In a certain subframe, UE is in auxiliary service The downlink control channel information of publicly-owned search space should be detected in cell, also to detect the descending control of the proprietary search space of user Channel information processed；It can also be configuration two：In a certain subframe, UE only detects publicly-owned search space in auxiliary serving cell Downlink control channel information, the downlink control channel information of proprietary search space is detected in another subframe.

Step S608：UE receive base station transmission random access procedure message 2 after, in auxiliary serving cell send with Machine access procedure message 3 gives base station.

Step S610：Base station is sending downstream service cell corresponding to the uplink service cell of Physical Random Access Channel On, random access procedure message 4 is sent to UE.

Step S612：UE is according to Temporary Cell Radio Network temporary mark or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C- RNTI), downlink control channel information is detected in auxiliary serving cell.

Step S614：UE sends random according to the downlink control channel information detected in auxiliary serving cell detection base station Access procedure message 4.

Embodiment seven

Reference picture 6, show the structure of the PRACH transmitting devices in a kind of according to embodiments of the present invention seven carrier aggregation Block diagram.

PRACH transmitting devices in the carrier aggregation of the present embodiment can be arranged in mobile terminal, and the device includes：Pass Defeated module 702, for sending PRACH in auxiliary serving cell；First receiving module 704, for being received in auxiliary serving cell The random access procedure message 2 that base station is sent；First sending module 706, for after random access procedure message 2 is received, Random access procedure message 3 is sent in auxiliary serving cell to base station；Second receiving module 708, for receive base station pass through it is auxiliary The random access procedure message 4 that serving cell is sent.

Preferably, transport module 702 receive base station transmission Stochastic accessing triggering message after, triggering mobile terminal with Machine selects random access leader sequence, or, it is not necessary to Stochastic accessing triggers message, randomly chooses random access leader sequence； According to the random access leader sequence of selection, PRACH is transmitted in auxiliary serving cell.

The method that the present embodiment is realized is referred to the associated description of embodiment one, will not be repeated here.

By the present embodiment, message trigger random access procedure is triggered using Stochastic accessing, UE selects according to the triggering message Random access leader sequence is selected, and then transmits PRACH corresponding to the random access leader sequence in selection in auxiliary serving cell, or Person, random access leader sequence is voluntarily randomly choosed by UE, so by the transmitting-receiving to random access procedure message 2,3 and 4 and Processing, can not transmit PRACH so as to solve prior art in auxiliary serving cell under carrier aggregation scene, be based especially on The problem of transmission PRACH of competition, and then realize the effect for transmitting PRACH under carrier aggregation scene in auxiliary serving cell.

Embodiment eight

Reference picture 7, show a kind of structured flowchart of according to embodiments of the present invention eight mobile terminal.

It is provided with the mobile terminal of the present embodiment applied to the PRACH transmitting devices in carrier aggregation, including：Transmit mould Block 802, for sending PRACH in auxiliary serving cell；First receiving module 804, for receiving base station in auxiliary serving cell The random access procedure message 2 of transmission；First sending module 806, for after random access procedure message 2 is received, auxiliary Random access procedure message 3 is sent on serving cell to base station；Second receiving module 808, pass through auxiliary service for receiving base station The random access procedure message 4 that cell is sent.The mobile terminal of the present embodiment can apply under carrier aggregation environment, in auxiliary clothes Cell transmission of being engaged in PRACH scene.

Preferably, transport module 802 is used for after the Stochastic accessing triggering message of base station transmission is received, and triggers movement eventually End random selection random access leader sequence, or, it is not necessary to Stochastic accessing triggers message, randomly chooses random access guiding sequence Row；According to the random access leader sequence of selection, PRACH is transmitted in auxiliary serving cell.

Preferably, under Stochastic accessing triggering message passes through main serving cell by base station high-level signaling or main serving cell Row control channel information, or, mobile terminal is sent to by the downlink control channel information of auxiliary serving cell by base station.

Preferably, when the high-level signaling of main serving cell or the downlink control channel information of serving cell include PRACH The information of the uplink service cell index at place.

Preferably, the information of the uplink service cell index included in the downlink control channel information of main serving cell is set In the downlink control channel information in increased CIF, or, the descending control letter being arranged in the downlink control channel information In order.

Preferably, transport module 802 includes：First sending module 8022, for triggering message by base station when Stochastic accessing Mobile terminal, and the high level are sent to by the high-level signaling of main serving cell or the downlink control channel information of main serving cell When signaling or downlink control channel information include the information of the uplink service cell index where PRACH, according to up clothes The information for cell index of being engaged in, PRACH is sent in the auxiliary serving cell of uplink service cell index instruction；And/or second send Module 8024, for triggering message to UE when base station sends Stochastic accessing by the downlink control channel information of auxiliary serving cell When, UE triggers the descending auxiliary serving cell of message in the Stochastic accessing received according to the random access leader sequence of selection PRACH is sent on the uplink service cell of system message SIBX links.

Preferably, the auxiliary serving cell that base station sends random access procedure message 2 is transmission PRACH uplink service cell Corresponding downstream service cell.Preferably, base station is fixed on downstream service cell corresponding to the uplink service cell for sending PRACH Upper transmission random access procedure message 2.

Preferably, the first receiving module 804 includes：First detection module 8042, for small in the auxiliary service for sending PRACH Qu Shang, the downlink control channel information of this transmission of detection base station；Second detection module 8044, for sending the auxiliary of PRACH On serving cell, according to preamble index corresponding to downlink control channel information and PRACH, detection random access procedure message 2.

Preferably, first detection module 8042 is examined in the auxiliary serving cell for sending PRACH according to the RA-RNTI of configuration Survey the downlink control channel information that base station is sent.

Preferably, first detection module 8042 is in the auxiliary serving cell for sending PRACH, according to the RA-RNTI of configuration, Under downlink control channel information and the proprietary search space of user that the publicly-owned search space that base station is sent is detected in one subframe Row control channel information；Or in the auxiliary serving cell for sending PRACH, according to the RA-RNTI of configuration, in a subframe The downlink control channel information of publicly-owned search space is only detected, the proprietary of the auxiliary serving cell is only detected in another subframe and is searched The downlink control channel information in rope space.

Preferably, the second receiving module 808 includes：3rd detection module 8082, in main serving cell or auxiliary service In cell, the downlink control channel information of this transmission of detection base station；4th detection module 8084, for according to the descending control Channel information, random access procedure message 4 is detected in auxiliary serving cell.

Preferably, CIF is included in the downlink control channel information of the 3rd detection module 8082 detection, for indicating downlink control Serving cell corresponding to channel information processed.

Preferably, the 3rd detection module 8082, in main serving cell, according to interim C-RNTI or C-RNTI, Detect the downlink control channel information that base station is sent.

The method that the present embodiment is realized is referred to the associated description of aforesaid plurality of embodiment of the method, and has above-mentioned implementation The beneficial effect of example, will not be repeated here.

As can be seen from the above description, the present invention sends Stochastic accessing triggering message using by base station, and UE is being received After triggering message to the Stochastic accessing, random access procedure is triggered, and message selection Stochastic accessing is triggered according to the Stochastic accessing Targeting sequencing, and then PRACH is transmitted in auxiliary serving cell according to the random access leader sequence of selection, solve prior art Can not be PRACH be transmitted in auxiliary serving cell the problem of, and then under the carrier aggregation scene, realize in auxiliary serving cell Upper transmission PRACH effect.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims

A kind of 1. Physical Random Access Channel PRACH transmission methods in carrier aggregation, it is characterised in that including：

User equipment (UE) transmits PRACH in auxiliary serving cell, wherein, the user equipment (UE) transmits in auxiliary serving cell The step of PRACH, includes：The UE does not need Stochastic accessing triggering message, randomly chooses the random access leader sequence, institute The random access leader sequences of the UE according to selection is stated, PRACH is transmitted in auxiliary serving cell；

The UE receives the random access procedure message 2 of base station transmission in auxiliary serving cell, wherein, described in the base station transmission The auxiliary serving cell of random access procedure message 2 is downstream service cell corresponding to transmission PRACH uplink service cell, The base station only sends random access procedure and disappeared sending in downstream service cell corresponding to the uplink service cell of the PRACH Breath 2, the base station is fixed on corresponding to the uplink service cell for sending the PRACH in the downstream service cell；

The UE sends random access procedure after the random access procedure message 2 is received in the auxiliary serving cell Message 3 gives the base station；

The UE receives the random access procedure message 4 that the base station is sent by the auxiliary serving cell.
2. according to the method for claim 1, it is characterised in that the UE is only transmitting the auxiliary service of the PRACH The random access procedure message 2 that the base station is sent is received in cell.
3. according to the method for claim 1, it is characterised in that the Stochastic accessing triggering message passes through master by the base station The high-level signaling of serving cell or the downlink control channel information of main serving cell, or, pass through the descending control of auxiliary serving cell Channel information processed, it is sent to the UE.
4. according to the method for claim 3, it is characterised in that the high-level signaling of the main serving cell or the master The downlink control channel information of serving cell includes the uplink service cell index where the PRACH.
5. according to the method for claim 4, it is characterised in that the uplink service cell index where the PRACH is located at：

In the carrier wave instructions field CIF added in the downlink control channel information of the main serving cell；

Or in the descending control signaling in the downlink control channel information of the main serving cell.
6. according to the method for claim 5, it is characterised in that in the downlink control channel information of the main serving cell also Including：

Preamble index and PRACH masks index.
7. according to the method for claim 4, it is characterised in that the UE is according to the random access guiding sequence of selection Row, transmission PARCH includes in auxiliary serving cell：

The UE transmits the PRACH on the indicated serving cell of the uplink service cell index where the PRACH.
8. according to the method for claim 3, it is characterised in that when Stochastic accessing triggering message is passed through by the base station When the downlink control channel information of auxiliary serving cell is sent to UE, the UE transmits PRACH in auxiliary serving cell to be included：

Up clothes of the UE in the descending auxiliary serving cell system message SIBX links of the Stochastic accessing triggering message received In cell of being engaged in, the PRACH is sent.
9. according to the method for claim 8, it is characterised in that X value is 2 in the SIBX.
10. according to the method for claim 1, it is characterised in that the UE receives the base station hair in auxiliary serving cell The step of random access procedure message 2 sent, includes：

The UE detects the downlink control channel information that the base station is sent in the auxiliary serving cell for sending the PRACH；

The UE is in the auxiliary serving cell for sending the PRACH, according to the downlink control channel information and described PRACH pairs The preamble index answered, detect the random access procedure message 2.
11. according to the method for claim 10, it is characterised in that the UE is sending the auxiliary serving cell of the PRACH On, the step of detecting the downlink control channel information that the base station is sent, includes：

The UE is in the auxiliary serving cell for sending the PRACH, according to the random access radio network temporary mark RA- of configuration RNTI detects the downlink control channel information that the base station is sent.
12. according to the method for claim 11, it is characterised in that the UE is sending the auxiliary serving cell of the PRACH On, included according to the step of downlink control channel information of the RA-RNTI of the configuration detections base station transmission：

The UE, according to the RA-RNTI of configuration, is examined in the auxiliary serving cell for sending the PRACH in a subframe Survey the downlink control channel information for the publicly-owned search space that the base station is sent and the descending control letter of the proprietary search space of user Road information；

Or

The UE is in the auxiliary serving cell for sending the PRACH, according to the RA-RNTI of configuration, in a subframe only The downlink control channel information of publicly-owned search space is detected, the proprietary search of the auxiliary serving cell is only detected in another subframe The downlink control channel information in space.
13. according to the method for claim 1, it is characterised in that it is small by the auxiliary service that the UE receives the base station The random access procedure message 4 that area is sent includes：

The UE according to the downlink control channel information detected in main serving cell, or, according in auxiliary serving cell The downlink control channel information detected, detect the random access procedure that the base station is transmitted by the auxiliary serving cell Message 4.
14. according to the method for claim 13, it is characterised in that the UE detects descending control letter in main serving cell Road information includes：

The UE is interim according to Temporary Cell Radio Network temporary mark or cell-radio network in the main serving cell Mark, detect the downlink control channel information that the base station is sent.
15. according to the method for claim 14, it is characterised in that the UE detected in main serving cell it is described under CIF is included in row control channel information, for indicating serving cell corresponding to the downlink control channel information.
16. according to the method for claim 13, it is characterised in that the UE detects descending control letter in auxiliary serving cell Road information includes：

The UE is interim according to Temporary Cell Radio Network temporary mark or cell-radio network in the auxiliary serving cell Mark, detect the downlink control channel information that the base station is sent.
17. the Physical Random Access Channel PRACH transmitting devices in a kind of carrier aggregation, it is characterised in that described device is set In mobile terminal, including：

Transport module, for transmitting PRACH in auxiliary serving cell, wherein, the transport module is additionally operable to connect at random Enter to trigger message, randomly choose the random access leader sequence, according to the random access leader sequence of selection, in auxiliary clothes PRACH is transmitted in business cell；

First receiving module, the random access procedure message 2 sent for receiving base station in auxiliary serving cell, wherein, it is described Base station sends the auxiliary serving cell of the random access procedure message 2 as corresponding to transmission PRACH uplink service cell Downstream service cell, the base station are only being sent corresponding to transmission PRACH uplink service cell in downstream service cell Random access procedure message 2, the base station are fixed on described descending corresponding to the uplink service cell for sending the PRACH On serving cell；

First sending module, for after the random access procedure message 2 is received, sent in the auxiliary serving cell with Machine access procedure message 3 gives the base station；

Second receiving module, the random access procedure message 4 sent for receiving the base station by the auxiliary serving cell.
18. device according to claim 17, it is characterised in that the Stochastic accessing triggering message is passed through by the base station The high-level signaling of main serving cell or the downlink control channel information of main serving cell, or, pass through the descending of auxiliary serving cell Control channel information is sent to the mobile terminal.
19. device according to claim 18, it is characterised in that the high-level signaling of the main serving cell or main service are small The downlink control channel information in area includes the information of the uplink service cell index where the PRACH.
20. device according to claim 18, it is characterised in that in the downlink control channel information of the main serving cell Comprising the PRACH where the information of uplink service cell index be arranged at the load added in the downlink control channel information In ripple instructions field CIF, or, it is arranged in the descending control signaling in the downlink control channel information.