CN103533663B

CN103533663B - Random access method and equipment thereof

Info

Publication number: CN103533663B
Application number: CN201310452277.3A
Authority: CN
Inventors: 付喆; 许芳丽
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-09-27
Filing date: 2013-09-27
Publication date: 2017-02-08
Anticipated expiration: 2033-09-27
Also published as: CN103533663A

Abstract

The invention discloses a random access method and equipment thereof. According to the invention, a random access procedure between UE (User Equipment) and an SeNB (Secondary evolved Node B) is realized under a multi-base-station polymerization scene, in particular a separation bearing scene, through a direct mutual cooperative manner of the UE and the SeNB or an MeNB (Master evolved Node B) assistant manner, and the random access procedure of the UE, which supports the multi-base-station polymerization, in particular the separation bearing, on the SeNB is solved, so that synchronization of the UE and the SeNB is realized or uplink and downlink transmission resources are obtained from the SeNB.

Description

Accidental access method and its equipment

Technical field

The present invention relates to the communications field, more particularly, to accidental access method and its equipment.

Background technology

e-UTRAN（Evolved Universal Terrestrial Radio Access Network, evolution general Terrestrial Radio Access Network）The network architecture as shown in figure 1, E-UTRAN is by eNB（Evolved NodeB, enode b, i.e. base Stand）Composition.ENB completes access network function, with UE（User Equipment, user equipment, i.e. terminal）By idle port communication.UE Not only there is chain of command to be connected but also there is user plane connection between eNB.The UE of network is attached to for each, by a MME （Mobile Management Entity, Mobility Management Entity）There is provided service for it, between MME and eNB, adopt S1-MME Interface is connected.S1-MME interface provides to chain of command service for UE, including mobile management and bearer management function.S-GW （Serving Gate Way, gateway）It is connected using S1-U interface between eNB, network is attached to for each UE, has a S-GW to provide service for it.S1-U interface provides user plane service for UE, and the user face data of UE is held by S1-U It is loaded in transmission between S-GW and eNB.

Fast development with the intelligent terminal and user continuous growth to data service rate and capacity requirement, tradition Macro base station monolayer overlay network can not meet the business demand of people.Therefore, 3GPP introduces the mode of layering networking To solve this problem：Lower powered by laying some in little overlay environments such as hot spot region, family's indoor environment, working environments Node（Referred to as home base stations Local eNB or cell Small cell, including forms such as Femto, Pico or relayings）, provide Small range covers, and obtains the effect of cell splitting so that operator can provide the user more high data rate, more inexpensive Business.

In the case of layering networking, in order to strengthen mobile management or improve peak rate, UE may be polymerized multiple base stations Cell resource, a kind of detached network architecture of carrying further can also be supported so that a part of radio bearer of UE （Radio Bearer, RB）And RRC（Radio Resource Control, wireless heterogeneous networks）Connect and maintain MeNB （Master eNB, main control base station）In the cell of management, another part radio bearer is in SeNB（Secondary eNB, subordinate base Stand）In the cell of management.

Under carrying separation scene, a part of Deta bearer of UE carries out maintaining management, another part in MeNB cell Deta bearer carries out maintenance management in SeNB cell, and the chain of command of UE carries and managed by MeNB cell maintenance.

Random access procedure（Random Access Procedure, RA procedure）It is UE and network side foundation nothing Wired link must be through process.Only after the completion of Stochastic accessing, it is only possible between eNB and UE carry out regular data transfer and connects Receive.UE can realize two basic functions by Stochastic accessing：（1）Obtain the uplink synchronous and eNB between；（2）Application is up Transfer resource.Random access procedure is applied to following 6 kinds of scenes：（1）From RRC_IDLE（RRC is idle）State is initially accessed little Area, i.e. RRC connection establishment；（2）Recover after Radio Link Failure, i.e. RRC connection reconstruction；（3）With Target cell in handoff procedure Synchronous；（4）Downlink data reaches and UE eats dishes without rice or wine to be in uplink loss state；（5）Upstream data reaches and UE eat dishes without rice or wine to be in up Desynchronizing state, though or non-step-out is however it is necessary that pass through Stochastic accessing application uplink transmission resource；（6）Auxiliary positioning, network profit Obtain Timing Advance with Stochastic accessing（Timing Advance, TA）.

In the random access procedure, UE is in PRACH（Physical Random Access Channel, physical accidental connects Enter channel）On to eNB send Preamble（Leading）Code, whether the Preamble code based on UE selection, can it may happen that colliding So that random access procedure to be divided into competition Stochastic accessing（Contention Based Random Access, CBRA）With non-competing Stochastic accessing（Contention-Free Random Access, CFRA）Two types.For RRC connection establishment, RRC connects Rebuild, UL（Uplink, up）Data reaches scene, and Stochastic accessing is independently triggered by UE, and eNB does not have any prior information, because This Stochastic accessing that is at war with；For handoff scenario, DL（Downlink, descending）Data reaches scene, and UE sends out according to eNB instruction Play non-competing Stochastic accessing.

Fig. 2A shows competition random access procedure, and this flow process may include：

（1）Msg1：Send Stochastic accessing Preamble

This message is UL message.ENB is responsible for the PRACH channel money to preamble code and for transmitting Preamble code Source is configured, and will configure（Including ra-PreambleIndex, prach-ConfigIndex, PRACH Mask Index Deng）Result notifies to UE.

Preamble set for competing Stochastic accessing can be further divided into two Preamble code characters：A group and B Group.After have selected Preamble code character, UE selects one from the corresponding all Preamble codes of this code character uniformly at random Preamble code, and select uniformly at random in the continuous three sub- frame ins starting from first subframe comprising PRACH channel Article one, PRACH channel, sends the Preamble code of selection on the PRACH channel selecting.

（2）Msg2：Accidental access response（RAR）

This message is DL message.This message is the response to UE after receiving Msg1 for the eNB, accidental access response message Accidental access response window sends.UE is in PCell（Main plot）On CSS（Public search space）Upper detection RA-RNTI （RA-Radio Network Temporary Identity, random access radio network temporary mark）The PDCCH of scrambling （Physical Downlink Control Channel, Physical Downlink Control Channel）To detect RAR message.

（3）Msg3：Scheduled transmission

This message is UL message.After UE is properly received Msg2, the uplink transmission resource that it distributes is transmitted Msg3.

（4）Msg4：Contention resolved

This message is DL message, for solving potentially to compete, determines the concrete UE completing this random access procedure.UE Start contention resolved intervalometer when sending Msg3, and restart this intervalometer in each re-transmission Msg3.Msg4 content and Msg3 Content is corresponding.

Fig. 2 B shows the flow process of non-competing random access procedure, and this flow process may include：

（1）Msg0：Stochastic accessing indicates

Msg0 message content includes UE and initiates PRACH resource and the Preamble resource that non-competing RA uses.

（2）Msg1：Send Preamble code

Send Preamble code distributed by eNB and indicated, therefore UE do not need select Preamble code character and Preamble code.If eNB does not indicate the PRACH channel set allowing to use, UE comprises PRACH channel at first A PRACH channel is selected uniformly at random in subframe；Otherwise, UE selects first in the PRACH channel set allowing to use Bar PRACH channel.UE sends, on the PRACH channel selecting, the Preamble code specified afterwards.

（3）Msg2：Accidental access response（RAR）

Sending and receiving of RAR message is essentially identical with the process competing in random access procedure.Difference is：

A) there is not competition in non-competing Stochastic accessing, is therefore not related to the transmission of Msg3, in accidental access response message Do not need to comprise Msg3 transfer resource distribution information；

When b) needing to send again Preamble code after receiving random access response message failure, UE is not needed upon moving back Keep away instruction to wait for a period of time, but can directly start the determination of PRACH channel and the transmission of Preamble code；

If c) UE judges that accidental access response message receives successfully then it is assumed that entirely non-competing random access procedure success Terminate.

Because UE is polymerized multiple base stations, each base station（Including SeNB and MeNB）The frequency band using may be different, dispose position Put and be likely to difference, therefore UE may need to support the random access procedure in SeNB cell.

Content of the invention

Embodiments provide and count method and its equipment at random, separate in order to particularly to carry in the polymerization of many base stations Scene under, realize the Stochastic accessing in slave base stations for the terminal.

A kind of non-competing accidental access method, including：

Terminal receives Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI in the cell of main control base station or the cell of slave base stations and adds The physical downlink control channel commands PDCCH order disturbing, obtains the cell of slave base stations described in described PDCCH order Random access lead code resource and/or Physical Random Access Channel PRACH resource, described random access lead code is used for described The cell initiating random access procedure of slave base stations；

Described terminal sends random access lead code according to described random access lead code resource and/or PRACH resource；

It is interim that described terminal monitors random access radio network in the cell of main control base station or the cell of described slave base stations The physical downlink control channel PDCCH of mark RA-RNTI scrambling, obtains the Stochastic accessing belonging to described terminal in described PDCCH Response message；Wherein, carry in the PDCCH of the RA-RNTI scrambling that the cell of described main control base station receives is described random Access response message, be that described slave base stations generate and send to described master according to the random access lead code that described terminal sends Control base station.

A kind of non-competing accidental access method, including：

Slave base stations send physical downlink control channel commands PDCCH of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling Order, or, will be the random access lead code resource of terminal distribution and/or PRACH resource is sent to main control base station, so that Described main control base station sends the PDCCH order of C-RNTI scrambling；Carrying described slave base stations in described PDCCH order is eventually The random access lead code resource of end distribution and/or PRACH resource, described random access lead code is used in described slave base stations Cell initiating random access procedure；

Described slave base stations receive described terminal and are sent according to described random access lead code resource and/or PRACH resource Random access lead code；

Described slave base stations dispatch the PDCCH of random access radio network temporary mark RA-RNTI scrambling, or, by pin Described main control base station is sent to the accidental access response message of described terminal, so that described main control base station scheduling RA-RNTI adds The PDCCH disturbing；The accidental access response message for described terminal is carried in described PDCCH.

A kind of non-competing accidental access method, including：

Main control base station receives the random access lead code resource that slave base stations are terminal distribution and/or physical accidental accesses letter Road PRACH resource, and send physical down control command PDCCH of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling Order, carry in described PDCCH order described slave base stations be terminal distribution random access lead code resource and/or PRACH resource, described random access lead code is used for the cell initiating random access procedure in described slave base stations；And/or

Described main control base station receives the accidental access response message for described terminal that slave base stations send, and dispatches The PDCCH of random access radio network temporary mark RA-RNTI scrambling, carries random for described terminal in described PDCCH Access response message.

A kind of terminal, including：

First processing module, interim for receiving cell-radio network in the cell of main control base station or the cell of slave base stations The physical downlink control channel commands PDCCH order of mark C-RNTI scrambling, obtains subordinate described in described PDCCH order The random access lead code resource of the cell of base station and/or Physical Random Access Channel PRACH resource, described random access guiding Code is for the cell initiating random access procedure in described slave base stations；

Second processing module, for the described random access lead code resource being got according to described first processing module And/or PRACH resource sends random access lead code；

3rd processing module, wireless for monitoring Stochastic accessing in the cell of main control base station or the cell of described slave base stations The physical downlink control channel PDCCH of Network Temporary Identifier RA-RNTI scrambling, obtains in described PDCCH and belongs to described terminal Accidental access response message；Wherein, carry in the PDCCH of the RA-RNTI scrambling that the cell of described main control base station receives Described accidental access response message, is that described slave base stations generate and send according to the random access lead code that described terminal sends To described main control base station.

A kind of base station, described base station is slave base stations, and described slave base stations include：

First processing module, for sending the Physical Downlink Control Channel of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling Order PDCCH order, or, will be the random access lead code resource of terminal distribution and/or PRACH resource is sent to master control The cell of base station, so that described main control base station sends the PDCCH order of C-RNTI scrambling；Carry in described PDCCH order Described slave base stations are random access lead code resource and/or the PRACH resource of terminal distribution, and described random access lead code is used In the cell initiating random access procedure in described slave base stations；

Second processing module, for receiving described terminal according to described random access lead code resource and/or PRACH resource Send random access lead code；

3rd processing module, for dispatching the PDCCH of random access radio network temporary mark RA-RNTI scrambling, or, Accidental access response message for described terminal is sent to the cell of described main control base station, so that the scheduling of described main control base station The PDCCH of RA-RNTI scrambling；The accidental access response message for described terminal is carried in described PDCCH.

A kind of base station, described base station is main control base station, and described main control base station includes：

First forwarding module, for receiving the random access lead code resource that slave base stations are terminal distribution and/or physics RACH PRACH resource, and send the physical down control command of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling PDCCH order, carries the random access lead code resource that described slave base stations are terminal distribution in described PDCCH order And/or PRACH resource, described random access lead code is for the cell initiating random access procedure in described slave base stations；With/ Or

Second forwarding module, for receiving the accidental access response message for described terminal that slave base stations send, And dispatch the PDCCH that random access radio network temporary mark RA-RNTI scrambles, carry for described terminal in described PDCCH Accidental access response message.

A kind of competitive random access method, including：

Terminal sends random access lead code in the cell of slave base stations；

Described terminal monitors random access radio network temporary mark RA-RNTI scrambling in the cell of described slave base stations Physical downlink control channel PDCCH, obtains the accidental access response message belonging to described terminal in described PDCCH；Or, leading The cell of control base station monitors the PDCCH of RA-RNTI scrambling, obtains the accidental access response belonging to described terminal in described PDCCH Message, described accidental access response message is that described slave base stations generate simultaneously according to the random access lead code that described terminal sends It is sent to described main control base station；

Described terminal sends scheduled transmission message in the cell sending described random access lead code；

Described terminal is sending the cell detection contention resolution message of described random access lead code.

A kind of competitive random access method, including：

The random access lead code that slave base stations receiving terminal sends；

Described slave base stations generate connecing at random for described terminal according to the random access lead code that described terminal sends Enter response message, dispatch the physical downlink control channel PDCCH of random access radio network temporary mark RA-RNTI scrambling, or Described accidental access response message is sent to main control base station by person, so that described main control base station dispatches RA-RNTI scrambling PDCCH；Wherein, carry the accidental access response message for described terminal in described PDCCH；

Described slave base stations receive, in the cell sending described lead code, the scheduled transmission message that described terminal sends, and After Stochastic accessing contention resolved, send contention resolution message in the cell sending described lead code.

A kind of competitive random access method, including：

Main control base station receives the accidental access response message that slave base stations send；

Described main control base station dispatches the Physical Downlink Control Channel of random access radio network temporary mark RA-RNTI scrambling PDCCH, carries described accidental access response message in described PDCCH.

A kind of terminal, including：

First processing module, sends random access lead code for the cell in slave base stations；

Second processing module, monitors random access radio network temporary mark RA- for the cell in described slave base stations The physical downlink control channel PDCCH of RNTI scrambling, the accidental access response belonging to described terminal in the described PDCCH of acquisition disappears Breath；Or, monitor the PDCCH of RA-RNTI scrambling in the cell of main control base station, obtain in described PDCCH and belong to described terminal Accidental access response message, described accidental access response message is the Stochastic accessing that described slave base stations send according to described terminal Lead code generates and sends to described main control base station；

3rd processing module, for sending scheduled transmission message in the cell sending described random access lead code；

Fourth processing module, in the cell detection contention resolution message sending described random access lead code.

First processing module, the random access lead code sending for receiving terminal；

Second processing module, for the random access lead code that sent according to described terminal generate for described terminal with Machine accesses response message, scrambles in the cell scheduling random access radio network temporary mark RA-RNTI of described slave base stations Physical downlink control channel PDCCH, or described accidental access response message is sent to the cell of main control base station, so that described Main control base station dispatches the physical downlink control channel PDCCH of random access radio network temporary mark RA-RNTI scrambling；Wherein, The accidental access response message for described terminal is carried in described PDCCH；

3rd processing module, disappears for receiving the scheduled transmission that described terminal sends in the cell sending described lead code Breath；

Fourth processing module, for, after Stochastic accessing contention resolved, sending competition in the cell sending described lead code Solve message.

Receiver module, the accidental access response message that the cell for receiving slave base stations sends；

Forwarding module, the physical down for dispatching random access radio network temporary mark RA-RNTI scrambling controls letter Road PDCCH, carries described accidental access response message in described PDCCH.

In sum, in the embodiment of the present invention, many base stations polymerization particularly carry under detached scene, by UE with The mode that SeNB direct interaction is coordinated, or the Stochastic accessing mistake by way of MeNB assists it is achieved that between UE and SeNB Journey, solves the polymerization of support many base stations and particularly carries random access procedure on SeNB for the detached UE, so achieve with The synchronization of SeNB or from SeNB obtain downstream transmission resource.

Brief description

For the technical scheme being illustrated more clearly that in the embodiment of the present invention, will make to required in embodiment description below Accompanying drawing briefly introduce it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these accompanying drawings His accompanying drawing.

Fig. 1 is e-UTRAN network architecture schematic diagram in prior art；

Fig. 2A is competition random access procedure schematic diagram of the prior art；

Fig. 2 B is non-competing random access procedure schematic diagram of the prior art；

Fig. 3 is hierarchical network deployment scenario schematic diagram of the prior art；

Fig. 4 is non-competing random access procedure schematic diagram provided in an embodiment of the present invention；

Fig. 5 is competition random access procedure schematic diagram provided in an embodiment of the present invention；

The random access procedure schematic diagram that Fig. 6 provides for the embodiment of the present invention one；

The random access procedure schematic diagram that Fig. 7 provides for the embodiment of the present invention two；

The random access procedure schematic diagram that Fig. 8 provides for the embodiment of the present invention three；

The random access procedure schematic diagram that Fig. 9 provides for the embodiment of the present invention four；

Figure 10 is the MAC RAR structural representation in the embodiment of the present invention；

The random access procedure schematic diagram that Figure 11 provides for the embodiment of the present invention five；

The random access procedure schematic diagram that Figure 12 provides for the embodiment of the present invention six；

The random access procedure schematic diagram that Figure 13 provides for the embodiment of the present invention seven；

The random access procedure schematic diagram that Figure 14 provides for the embodiment of the present invention eight；

Figure 15 is one of terminal structure schematic diagram provided in an embodiment of the present invention；

Figure 16 is one of architecture of base station schematic diagram provided in an embodiment of the present invention；

Figure 17 is the two of architecture of base station schematic diagram provided in an embodiment of the present invention；

Figure 18 is the two of terminal structure schematic diagram provided in an embodiment of the present invention；

Figure 19 is the three of architecture of base station schematic diagram provided in an embodiment of the present invention；

Figure 20 is the four of architecture of base station schematic diagram provided in an embodiment of the present invention.

Specific embodiment

The embodiment of the present invention is applied to the polymerization of many base stations, particularly carries detached scene.

Fig. 3 shows a kind of typical layered network architecture.As shown in figure 3, macro base station（It is denoted as Macro eNB）Base is provided Plinth covers, lower powered local node（In figure is labeled as Small cell）Focus covering, local node and Macro eNB are provided Between there is data and/or signaling interface（It can be wired or wireless interface）, UE can be operated in Macro eNB or local and save Under point.Because the cell coverage area that local node controls is little, the UE of service is few, so the UE being connected to local node tends to Obtain more preferable service quality.Therefore, when the UE being connected to Macro eNB enters the covering model of the cell corresponding to local node When enclosing, local node can be transferred to obtain the service of local node offer；When UE is away from the cell corresponding to local node During coverage, need to transfer to the cell of Macro eNB control, to keep wirelessly connecting.

The network architecture shown in Fig. 2 can be supported to carry and separate.Carry under separation scene in Macro eNB cell and Small Cell cell overlapping covered interior, support carry detached UE may be simultaneously operated in Macro eNB and Small Cell Under, using the resource of multiple base stations.

Particularly, when UE supports CA under SeNB（Carrier Aggregation, carrier aggregation）When, UE is under SeNB There may be a cell similar with MeNB PCell（Hereinafter referred to as SeNB PCell）, this cell possesses similar MeNB The function of PCell, supports data transfer, is configured with PUCCH（Physical Uplink Control CHannel, physical uplink Link control channel）Deng, but cannot function as per UE（According to UE）RRC link maintain cell use.

It has been generally acknowledged that：In the polymerization of many base stations（It is polymerized including carrying detached base station）Scene under, UE polymerization multiple In base station, to provide the base station Macro eNB of grand covering as main control base station Master eNB（Or claim MeNB）, to provide focus The Small Cell base station covering is as Secondary eNB（Or claim SeNB）.Below to provide grand covering and maintenance and UE The base station that RRC connects is MeNB, and other base stations of UE polymerization are explanation as a example SeNB.

The embodiment of the present invention is directed to the polymerization of many base stations and particularly carries detached scene it is proposed that non-competing Stochastic accessing side Method and competitive random access method, realize the Stochastic accessing in slave base stations for the terminal.

Initiate scene in conjunction with Stochastic accessing and carry separated transmission framework, generally need to touch in the case of following several possibility Send out random access procedure in SeNB cell for the UE：

- when MeNB reports according to load balancing, UE measurement, judge to need to support to carry the part carrying point of detached UE From when being managed and transmit on selected SeNB, MeNB triggers the carrying separation process of this UE and selected SeNB.UE according to The carrying separation message that MeNB notifies, initiating random access procedure on corresponding SeNB, to realize the uplink synchronous with SeNB；

- when SeNB coordinator（I.e. small cell coordinator）Reported according to load balancing, UE measurement, judge to need The part carrying that support is carried detached UE is separated to when being managed and transmit on another SeNB, and SeNB center controls Device notifies the carrying separation process of this UE of base station triggers and selected SeNB of UE work at present.UE separates according to the carrying receiving Message, initiating random access procedure on corresponding SeNB, to realize the uplink synchronous with SeNB.Wherein, as small cell cluster（Cell cluster）Be not belonging to any one MeNB coverage, and support to carry detached in the case of, introduce small cell coordinator.Small cell coordinator is used for the coordination of all small cell under it, route, management Deng can be an independent entity or a logical functional entity；

The detached UE of-carrying is in and SeNB cell UL（Up）Desynchronizing state, and separately on SeNB, the UE of transmission holds When carrying corresponding downlink data arrival；

The detached UE of-carrying is in and SeNB cell UL desynchronizing state, and separates the UE carrying correspondence of transmission on SeNB Upstream data reach when；

The detached UE of-carrying does not configure D-SR in SeNB cell（Dedicated Scheduling Request, special tune Degree request）Resource or D-SR transmission exceed maximum transmission times, and it is corresponding up to separate the UE carrying of transmission on SeNB When data reaches.

In above-mentioned several situation, in the case of having two kinds, UE SeNB cell RA demand or SeNB cell UL cannot be known in base station Scheduling of resource demand：UE in SeNB cell uplink step-out and when upstream data reaches, or when UE upstream data reaches but does not configure When D-SR the or D-SR transmission of corresponding SeNB exceedes maximum transmission times.To both of these case, UE is needed actively to initiate to connect at random Enter process, i.e. CBRA.Under other SeNB RA scenes, because SeNB has prior information, generally adopt CFRA process（When competing Strive RA resource inadequate when, can by base station instruction UE initiate CBRA）.

Below in conjunction with the accompanying drawings, respectively non-competing accidental access method and competitive random access method are illustrated.

Referring to Fig. 4, it is non-competing random access procedure schematic diagram provided in an embodiment of the present invention.As illustrated, this flow process May include：

Step 401：SeNB sends the PDCCH order of C-RNTI scrambling, or, by the preamble resource distributed for UE And/or PRACH resource is sent to MeNB, so that MeNB sends the PDCCH order of C-RNTI scrambling；Described PDCCH order In carry described SeNB be this UE distribution preamble resource and/or PRACH resource, this preamble be used in described SeNB Cell initiating random access procedure.

Accordingly, UE receives the PDCCHorder of C-RNTI scrambling in the cell of MeNB or the cell of SeNB, obtains described The preamble resource of SeNB cell of instruction and/or PRACH resource in PDCCH order.

Step 402：UE sends preamble according to described preamble resource and/or PRACH resource.

Step 403：After described SeNB receives this preamble of UE transmission, the PDCCH of scheduling RA-RNTI scrambling, or, Accidental access response message for this UE is sent to MeNB, so that MeNB dispatches the PDCCH of RA-RNTI scrambling；Described The accidental access response message for this UE is carried in PDCCH.

Accordingly, this UE monitors the PDCCH of RA-RNTI scrambling in the cell of MeNB or the cell of SeNB, obtains this PDCCH In belong to the accidental access response message of this UE.

In a kind of optimal way, in the PDCCH order that SeNB or MeNB sends, also carry and preamble resource And/or the identification information of the cell of the corresponding SeNB of PRACH resource so that UE according to the mark of the cell of this SeNB corresponding Cell sends preamble.Accordingly, in step 401, UE receives, in the cell of MeNB, the PDCCH that C-RNTI scrambles After order, obtain the preamble resource in this PDCCHorder and/or PRACH resource, and with this preamble resource And/or the mark of the cell of the corresponding SeNB of PRACH resource；In step 402, this UE according to this preamble resource and/or The mark of the cell of PRACH resource and this SeNB, sends preamble in the cell of corresponding SeNB.

By above-mentioned preferred implementation, can enable UE according to PDCCH order in SeNB cell ID, at this Identify corresponding cell（I.e. SeNB cell）Send preamble, thus random access procedure on SeNB for the triggering.

In a kind of optimal way, in step 403, UE can judge whether accidental access response message belongs in the following manner In this UE：

Mode one：The mark of portability SeNB cell in RN-RNTI.Accordingly, UE obtains cell mark from RA-RNTI Know, if this cell ID is identical with the mark of the cell sending preamble, and the preamble detecting and this UE sends Preamble identical, then RA-RNTI scrambling PDCCH in accidental access response message belong to this UE；

Mode two：Portability C-RNTI in accidental access response message, this C-RNTI are that this UE is sending preamble C-RNTI in cell.Accordingly, UE obtains C-RNTI from accidental access response message, if this C-RNTI is this UE sending C-RNTI in the cell of preamble, then this accidental access response message belong to this UE.

By above-mentioned preferred implementation it is ensured that UE can be properly received one's own accidental access response disappears Breath is such that it is able to be successfully completed random access procedure.

In a kind of optimal way, in step 403, UE can monitor RA-RNTI in the public search space of the cell of MeNB The PDCCH of scrambling.

In a kind of optimal way, in step 403, SeNB in the public search space of the PCell of this SeNB, or can send out Send the public search space of the cell of preamble, the PDCCH of scheduling RA-RNTI scrambling.In the cell sending preamble During public search space scheduling PDCCH, can be without the cell ID carrying SeNB in RA-RNTI.Accordingly, UE can be SeNB's The public search space of PCell, or the public search space in the cell sending preamble, monitor RA-RNTI scrambling PDCCH.

The polymerization in many base stations be can be seen that by the flow process of Fig. 4 and particularly carry under detached scene, by UE and SeNB The mode that direct interaction is coordinated, or the random access procedure by way of MeNB assists it is achieved that between UE and SeNB, solution Support of having determined many base stations polymerization particularly carry non-competing random access procedure on SeNB for the detached UE, and then achieve with The synchronization of SeNB or from SeNB obtain downstream transmission resource.

Referring to Fig. 5, it is competition random access procedure schematic diagram provided in an embodiment of the present invention.As illustrated, this flow process can Including：

Step 501：UE sends preamble in the cell of SeNB.

Step 502：This SeNB generates the accidental access response message for this UE according to the preamble that this UE sends, and In the PDCCH of the cell scheduling RA-RNTI scrambling of this SeNB, or this accidental access response message is sent to MeNB, so that MeNB dispatches the PDCCH of RA-RNTI scrambling.The accidental access response message for this UE is carried in described PDCCH.

Accordingly, UE monitors the PDCCH of RA-RNTI scrambling in the cell of this SeNB or the cell of MeNB, obtains this PDCCH In belong to the accidental access response message of this UE.

Step 503：This UE sends scheduled transmission message in the cell sending this preamble.

Step 504：SeNB receives, in the cell sending this preamble, the scheduled transmission message sending, and in Stochastic accessing After contention resolved, send contention resolution message in the cell sending this preamble.Accordingly, this UE is sending this preamble Cell detection contention resolution message.

In a kind of optimal way, UE, before the cell of SeNB sends preamble, may also include following process and operates One of or combination：

（1）UE selects preamble in specified preamble group, and the preamble in described specified preamble group is special Initiate competition random access procedure for UE in SeNB to use.Accordingly, in step 501, UE sends from this in the cell of SeNB The preamble selecting in specified preamble group.

（2）UE selects PRACH, the PRACH in described specified PRACH group to be exclusively used in UE in SeNB in specified PRACH group Initiate competition random access procedure to use.Accordingly, in step 501, UE according to from specified PRACH group select PRACH, The cell of SeNB sends preamble.

（3）UE selects to specify preamble format（Pramble form）And with described specified preamble The corresponding PRACH of format, described specified preamble format are exclusively used in UE and initiate competition Stochastic accessing in the cell of SeNB Process uses.Accordingly, in step 501, UE specifies according to the described specified preamble format selecting and with described The corresponding PRACH of preamble format, sends preamble in the cell of SeNB.

By above-mentioned optimal way, SeNB can be made to pass through specific preamble, specific PRACH or specific Preamble format, judges that this is the competition random access procedure that UE initiates in SeNB cell, thus competing to this UE Strive random access procedure to be processed.

In a kind of optimal way, the mark of portability SeNB cell in RN-RNTI.Accordingly, in step 502, UE leads to Cross in the following manner and judge whether accidental access response message belongs to this UE：Obtain cell ID from RA-RNTI, if this cell mark Know identical with the mark of the cell sending preamble, and the preamble phase that the preamble detecting and this UE sends With then the accidental access response message in PDCCH belongs to this UE.By above-mentioned preferred implementation it is ensured that UE can be just Really receive one's own accidental access response message such that it is able to be successfully completed random access procedure.

In a kind of optimal way, in step 502, UE can monitor RA-RNTI in the public search space of the PCell of MeNB The PDCCH of scrambling.

In a kind of optimal way, in step 502, UE in the public search space of the PCell of SeNB, or can send The public search space of the cell of preamble, monitors the PDCCH of RA-RNTI scrambling.

The polymerization in many base stations be can be seen that by the flow process of Fig. 5 and particularly carry under detached scene, by UE and SeNB The mode that direct interaction is coordinated, or the competition Stochastic accessing mistake by way of MeNB assists it is achieved that between UE and SeNB Journey, solves the polymerization of support many base stations and particularly carries random access procedure on SeNB for the detached UE, so achieve with The synchronization of SeNB or from SeNB obtain downstream transmission resource.

In order to clearer, the embodiment of the present invention is illustrated, below by embodiment one, embodiment two, embodiment three And example IV, non-competing random access procedure provided in an embodiment of the present invention is described in detail, by embodiment five, in fact Apply example six, embodiment seven and embodiment eight, competition random access procedure provided in an embodiment of the present invention is described in detail.

Embodiment one

When needing UE in SeNB initiating random access procedure, UE can be forced to be monitored in SeNB cell CSS（To exist As a example the scene of MeNB）.

As shown in fig. 6, when network-triggered UE CFRA process, this CFRA process may include：

Step 601：Send Stochastic accessing instruction（Msg0）.

The Preamble resource of SeNB selected UE transmission Msg1 and/or PRACH resource, and scrambled by C-RNTI PDCCH order dispatches UE random access procedure in SeNB cell.SeNB cell herein can be SeNB PCell, or It is the scheduling cell that preamble sends cell, or preamble sends cell（Preamble sends cell and refers to send The cell of preamble, as follows）.

Step 602：Send Preamble code（Msg1）.

After UE receives PDCCH order, the Preamble resource according to configuration and/or PRACH resource send preamble. Further, the CSS of the CSS or SeNB PCell that UE can send cell in preamble monitors RA-RNTI scrambling PDCCH, to obtain RAR message.

Step 603：Receive RAR（Msg2）.

After SeNB receives and decodes the preamble in this PRACH resource, generate RAR message, and in this preamble In the cell sending or SeNB PCell, this UE SeNB RAR is dispatched by the PDCCH that RA-RNTI scrambles.

For distinguishing UE, one of following several ways can be adopted：

Mode one：Indicate the SeNB cell identity information sending Preamble by RA-RNTI.UE is in SeNB PCell Or preamble sends the SeNBRAR detecting whether on the CSS of cell for oneself.When UE detects on SeNB PCell During RAR, if the cell of the RA-RNTI instruction detecting is the cell that this UE sends preamble, and detect The preamble that preamble is sent with this UE is identical, then confirm that this SeNB RAR is that then UE is from this SeNB for this UE RAR obtains the information such as TAC, UL-grant, TC-RNTI that SeNB is its configuration.When UE examines in the cell that preamble sends When surveying RAR, if the preamble detecting is identical with the preamble that this UE sends, confirm that this SeNB RAR is for this UE , then UE obtains the information such as TAC, UL-grant, TC-RNTI that SeNB is its configuration from this SeNB RAR.

Mode two：By TC-RNTI to correspond to the UE C-RNTI of SeNB in RAR（Polymerization base station United Dispatching distribution C- The C-RNTI of the corresponding SeNB of RNTI, UE is not yet assigned to, for MeNB PCell, the C-RNTI that other UE use.In addition, MeNB and SeNB Between the configuration of preamble resource coordination, the non-competing preamble resource of the pre- SeNB of MeNB non-competing preamble resource staggers； MeNB and SeNB competition preamble group configuration is overlapping）Replace, then whether UE is for certainly according to the C-RNTI in SeNB RAR Oneself, to obtain the information such as TAC, UL-grant, TC-RNTI that SeNB is its configuration.Figure 10 shows a kind of MAC RAR message Form.

Mode three：Using between cell each under SeNB preamble resource coordination configuration, each SeNB cell non-competing Strive preamble resource to stagger, the overlapping mode of competition preamble resource distribution.

Further, share Small cell in many base stations（SeNB）Scene under, UE and SeNB select main Macro eNB Auxiliary MeNB as SeNB Stochastic accessing.In this case, need main MacroeNB identification notification to UE it is also desirable to gather The mark of the main Macro eNB of interaction between the multiple base stations closed.

Embodiment two

When needing UE in SeNB initiating random access procedure, UE can be forced to be detected in SeNB cell CSS（To exist As a example the CFRA of the scene of MeNB）.

As shown in fig. 7, when network-triggered UE CFRA process, this CFRA process may include：

Step 701：Send Stochastic accessing instruction（Msg0）.

SeNB selectes UE and sends the Preamble resource of Msg1 and/or PRACH resource, UE is identified, selectes The information such as preamble resource, cell ID are informed to MeNB.By MeNB in MeNB cell（As MeNB PCell）Use C-RNTI The PDCCH order scheduling UE random access procedure of scrambling.Also need in Msg0 carry and select the cell mark sending preamble The information such as knowledge, SeNB mark.

Step 702：Send Preamble code（Msg1）.

After UE receives PDCCH order, the PRACH resource of selected SeNB cell sends selected preamble. Further, UE sends the PDCCH of the CSS monitoring RA-RNTI scrambling of the CSS or SeNB PCell of cell in preamble, with Obtain RAR message.

Step 703：Receive RAR（Msg2）.

For distinguishing UE, one of following several ways can be adopted：

Mode one：Indicate the SeNB cell identity information sending Preamble by RA-RNTI.UE is in SeNB PCell Or preamble sends and monitors, on the CSS of cell, the SeNBRAR whether having for oneself.When UE detects on SeNB PCell During RAR, if the cell of the RA-RNTI instruction detecting is the cell that this UE sends preamble, and detect The preamble that preamble is sent with this UE is identical, then confirm that this SeNB RAR is that then UE is from this SeNB for this UE RAR obtains the information such as TAC, UL-grant, TC-RNTI that SeNB is its configuration.When UE examines in the cell that preamble sends When surveying RAR, if the preamble detecting is identical with the preamble that this UE sends, confirm that this SeNB RAR is for this UE , then UE obtains the information such as TAC, UL-grant, TC-RNTI that SeNB is its configuration from this SeNB RAR.

Embodiment three

When needing UE to initiate CFRA process in SeNB, UE can send Preamble in SeNB cell, and in MeNB The SeNB RAR of the PDCCH scheduling of RA-RNTI scrambling is received on PCell.（Taking the carrying separation scene that there is MeNB as a example）.

As shown in figure 8, when network-triggered UE SeNB CFRA process, this CFRA process may include：

Step 801：Send Stochastic accessing instruction（Msg0）.

The Preamble resource of SeNB selected UE transmission Msg1 and/or PRACH resource, and scrambled by C-RNTI PDCCH order is in SeNB cell（As SeNB PCell or preamble sends the scheduling cell of cell, or preamble sends Cell）Upper scheduling UE random access procedure.

Step 802：Send Preamble code（Msg1）.

After UE receives PDCCH order, the PRACH resource of selected SeNB cell sends selected preamble. Further, UE can open RAR window after preamble sends 2ms（SeNBRAR window length needs to extend, widow Minimum value is 2ms+backhaul time delay, and greatest length can reach 10ms+backhaul time delay）, preparing reception may be The SeNB RAR message that MeNB cell sends.

Step 803：Receive RAR（Msg2）.

SeNB, after selected preamble transmission cell receives selected preamble, generates RAR and RAR prefix, And UE is identified, preamble sends cell ID, the information such as RAR, RAR prefix notifies to MeNB.MeNB PCell receives After the information that SeNB notifies, the UE SeNB RAR of the PDCCH scheduling being scrambled by RA-RNTI on MeNB PCell.

For distinguishing UE, one of following several ways can be adopted：

Mode one：Indicate the SeNB cell identity information sending Preamble, e.g., RA-RNTI=1+ by RA-RNTI t_id+10*f_id+100*cell_id；

Mode two：By TC-RNTI to correspond to the UE C-RNTI of SeNB in RAR（Polymerization base station United Dispatching distribution C- The C-RNTI of the corresponding SeNB of RNTI, UE is not yet assigned to, for MeNB PCell, the C-RNTI that other UE use.In addition, MeNB and SeNB Between the configuration of preamble resource coordination, the non-competing preamble resource of the pre- SeNB of MeNB non-competing preamble resource staggers； MeNB and SeNB competition preamble group configuration is overlapping）Replace.Figure 10 shows a kind of MAC RAR message form.

Mode three：Can be using the preamble resource coordination configuration between MeNB and SeNB, the non-competing preamble of MeNB Resource preamble non-competing with SeNB resource staggers, and under this base station, the non-competing preamble resource of each cell staggers.MeNB Compete the overlapping mode of preamble group configuration with SeNB.

UE detects whether the SeNB RAR for oneself on the CSS of MeNB PCell, if the RA-RNTI detecting refers to The cell shown is the cell that this UE sends preamble, and the preamble phase that the preamble detecting and this UE sends Same, then confirm that this SeNB RAR is for this UE, then UE is its configuration from this SeNB RAR acquisition SeNB TAC, UL- The information such as grant, TC-RNTI.

Example IV

As shown in figure 9, when network-triggered UE SeNB CFRA process, this CFRA process may include：

Step 901：Send Stochastic accessing instruction（Msg0）.

ENB selectes Preamble resource and/or the PRACH resource that UE sends Msg1, preamble UE being identified, selecting The information such as resource, cell ID are informed to MeNB.By MeNB in MeNB cell（As MeNB PCell）With C-RNTI scrambling PDCCH order dispatches UE random access procedure.Also need in Msg0 carry and select cell ID, the SeNB sending preamble The information such as mark.

Step 902：Send Preamble code（Msg1）.

Step 903：Receive RAR（Msg2）.

For distinguishing UE, one of following several ways can be adopted：

Embodiment five

When needing UE to initiate CBRA process in SeNB, UE sends Preamble in SeNB cell（From Random Access Preamble is selected in Preambles group C）, and the PDCCH scheduling of RA-RNTI scrambling is received on MeNB PCell SeNB RAR.UE sends/receives Msg3/Msg4 in SeNB cell（Taking the carrying separation scene that there is MeNB as a example）.

In the present embodiment, in Random Access Preambles group A and Random of existing corresponding SeNB On the basis of Access Preambles group B, introduce new Random AccessPreambles group（This enforcement Referred to as Random Access Preambles group C in example）.RandomAccess Preambles group C can be Carry and notify to UE in separation process it is also possible to notify to UE after the completion of carrying separation.Random Access Preambles Group C is exclusively used in supporting that carrying detached UE initiates CBRA process in SeNB.Ensure consistent between each base station of polymerization Specific preamble resource in packet mode and packet.When needing to trigger SeNB RA process, UE or SeNB is in Random Access Preambles group C selects preamble resource.

As shown in figure 11, the process that UE initiates SeNB CBRA in SeNB cell may include：

Step 1101：Send Preamble code（Msg1）

When supporting to carry detached UE triggering SeNB CBRA process, UE is in Random AccessPreambles Group C selects preamble resource, selects PRACH resource in SeNB cell, is sent with the PRACH resource oneself selecting and selects Preamble.Further, UE can open RAR window after preamble sends 2ms（SeNB RAR window length needs Extend, widow minimum value is 2ms+backhaul time delay, and greatest length can reach 10ms+backhaul time delay）, accurate Standby reception may be in the SeNB RAR message of MeNB cell transmission.

Step 1102：Receive RAR（Msg2）

After SeNB receives and decodes the preamble in this PRACH resource, judge the Random of preamble ownership Access Preambles group, and whether generate the RAR information for this UE, if Random is Access Preambles group is C and judges to generate corresponding RAR, then SeNB generates RAR information, RAR head, and preamble is sent out The first-class information of cell ID, RAR, RAR is sent to notify to MeNB.After MeNB PCell receives the information of SeNB notice, The UE SeNB RAR of the PDCCH scheduling being scrambled by RA-RNTI on MeNB PCell.

Can using with example IV in provide by the way of one or mode three identical mode distinguish UE, such as can be in RA- The SeNB cell identity information sending Preamble is embodied in RNTI.UE has detected whether to be directed on the CSS of MeNB PCell The SeNB RAR of oneself, to obtain the information such as TAC, UL-grant that SeNB is its configuration.

Step 1103～1104：Msg3 sends and Msg4（Contention resolved）

After UE receives and decodes SeNB Msg2 message（Whether Msg2 is properly received discriminant approach and current mechanism class Seemingly）, the SeNB cell sending peamble sends Msg3 message, in message, at least carries the C-RNTI of the UE of corresponding SeNB, This C-RNTI is that network notifies when carrying and separating to use in SeNB to UE.After UE sends Msg3, open corresponding SeNB cell Contention resolved intervalometer, start preamble send SeNB cell receive SeNB RA Msg4 message.When UE listens to SeNB sends the PDCCH of the C-RNTI scrambling of SeNB that send in cell, corresponding in UE preamble, then UE thinks SeNB CBRA success, completes contention resolved.

In addition, sharing Small cell in many base stations（SeNB）Scene under, UE and SeNB select main Macro eNB conduct Auxiliary MeNB of SeNB RA.In this case, need by main Macro eNB identification notification to UE it is also desirable to polymerization multiple The mark of the main Macro eNB of interaction between base station.

Embodiment six

When needing UE to initiate CBRA process in SeNB, UE sends Preamble in SeNB cell（Gather supporting many base stations Close UE and select PRACH resource in special PRACH resource group B）, and the PDCCH of RA-RNTI scrambling is received on MeNB PCell The SeNB RAR of scheduling.UE sends/receives Msg3/Msg4 in SeNB cell（Taking the carrying separation scene that there is MeNB as a example）.

In the present embodiment, introduce the mode of the PRACH resource packet of corresponding SeNB, i.e. existing PRACH running time-frequency resource is divided Group, part PRACH resource（As PRACH resource group A）For traditional RA process, other PRACH resources（As PRACH resource group B） It is exclusively used in supporting to carry the process that detached UE initiates RA in SeNB.The grouping information of PRACH resource can separate in carrying Notify in journey to UE it is also possible to notify to UE after the completion of carrying separation.Ensure consistent packet between each base station of polymerization Specific PRACH resource in mode and packet.When needing to trigger SeNB RA process, UE or SeNB is in suitable PRACH resource Packet（As PRACH resource group B）Middle selection PRACH resource.

As shown in figure 12, the process that UE initiates SeNB CBRA in SeNB cell may include：

Step 1201：Send Preamble code（Msg1）

When supporting to carry detached UE triggering SeNB CBRA process, UE selects PRACH to provide in PRACH resource group B Source, and send, using the PRACH resource selecting from PRACH resource group B, the preamble code randomly choosing on SeNB.Enter one Step, UE can open RAR window after preamble sends 2ms（SeNB RAR window length needs to extend, and widow is minimum Value is 2ms+backhaul time delay, and greatest length can reach 10ms+backhaul time delay）, preparing reception may be in MeNB The SeNB RAR message that cell sends.

Step 1202：Receive RAR（Msg2）

After SeNB receives and decodes the preamble in this PRACH resource, judge the PRACH money of PRACH resource ownership Source packet, and whether generate the RAR information for this UE, if PRACH resource is grouped into group B（It is exclusively used in supporting to carry dividing From UE SeNB initiate RA process resource group）And judge to generate corresponding RAR, SeNB generates RAR information, RAR head, and will Preamble sends the information such as cell ID, RAR, RAR prefix and notifies to MeNB.MeNB PCell receives the letter of SeNB notice After breath, the UESeNB RAR of the PDCCH scheduling being scrambled by RA-RNTI on MeNB PCell.

Step 1203～1204：Msg3 sends and Msg4（Contention resolved）

After UE receives and decodes SeNB Msg2 message（Whether Msg2 is properly received discriminant approach and current mechanism class Seemingly）, the SeNB cell sending peamble sends Msg3 message, in message, at least carries the C-RNTI of the UE of corresponding SeNB. After sending Msg3, UE opens the contention resolved intervalometer of corresponding SeNB cell, and the SeNB cell starting to send in preamble connects Receive SeNB RA Msg4 message.When UE listens to the C- that SeNB sends SeNB that send in cell, corresponding in UE preamble The PDCCH of RNTI scrambling, UE think SeNB CBRA success, complete contention resolved.

Embodiment seven

When needing UE to initiate CBRA process in SeNB, UE sends Preamble in SeNB cell（Gather supporting many base stations Close UE and select the corresponding PRACH resource of new preamble format）, and RA-RNTI scrambling is received on MeNB PCell The SeNB RAR of PDCCH scheduling.UE sends/receives Msg3/Msg4 in SeNB cell（With the carrying separation scene that there is MeNB it is Example）.

In the present embodiment, introduce new lead code form（new preamble format）, separate for supporting to carry UE CBRA process is initiated on SeNB.To frame structure 1, new preamble format can correspond to PRACH configuration index（PRACH configuration index）One or more of value 30,46,60,61,62 value.Frame is tied Structure 2, new preamble format can correspond to one of PRACHconfiguration index value 58～63 or many Individual value.When needing to trigger SeNB RA process, UE or SeNB selects the corresponding PRACH of new preamble format to initiate SeNB RA process.

As shown in figure 13, the SeNB CBRA process that UE initiates in SeNB cell may include：

Step 1301：Send Preamble code（Msg1）

When supporting to carry detached UE triggering SeNB CBRA process, UE selects new preamble in SeNB cell Format corresponding PRACH resource, randomly chooses the competition preamble resource of corresponding SeNB cell, in selected PRACH money Preamble is sent on source..Further, UE can open RAR window after preamble sends 2ms（SeNB RAR window Length needs to extend, and widow minimum value is 2ms+backhaul time delay, when greatest length can reach 10ms+backhaul Prolong）, prepare to receive the SeNB RAR message that may send in MeNB cell.

Step 1302：Receive RAR（Msg2）

After SeNB receives and decodes the preamble in this PRACH resource, judge whether to generate the RAR letter for this UE Cease, if so, SeNB generates RAR information, RAR head, and preamble is sent the information such as cell ID, RAR, RAR prefix and lead to Know to MeNB.After MeNB PCell receives the information of SeNB notice, MeNB PCell is scrambled by RA-RNTI The UESeNB RAR of PDCCH scheduling.

Can using with example IV in provide by the way of one or mode three identical mode distinguish UE, such as can be in RA- The SeNB cell identity information sending Preamble is embodied in RNTI.UE has detected whether to be directed on the CSS of MeNB PCell The SeNB RAR of oneself, to obtain the information such as TAC, UL-grant, TC-RNTI that SeNB is its configuration.

Step 1303～1304：Msg3 sends and Msg4（Contention resolved）

After UE receives and decodes SeNB Msg2 message, the SeNB cell sending peamble sends Msg3 message, The C-RNTI of the UE of corresponding SeNB is at least carried in message.After sending Msg3, the contention resolved that UE opens corresponding SeNB cell is fixed When device, start preamble send SeNB cell receive SeNB RA Msg4 message.When UE listens to SeNB in UE Preamble sends the PDCCH of the C-RNTI scrambling of SeNB that send in cell, corresponding, and UE thinks SeNB CBRA success, completes Contention resolved.

Embodiment eight

When needing UE in SeNB initiating random access procedure, UE can be forced to be detected in SeNB cell CSS（To exist As a example the scene of MeNB）.

As shown in figure 14, the SeNB CBRA process that UE initiates in SeNB cell may include：

Step 1401：Send Preamble code（Msg1）.

When needing UE actively to trigger CBRA, UE selects PRACH resource and Preamble in the cell needing to carry out RA Resource.Further, UE sends cell in preamble or the CSS of SeNB PCell monitors the PDCCH that RA-RNTI scrambles, with Obtain RAR message.

Step 1402：Receive RAR（Msg2）.

After SeNB receives and decodes the preamble in this PRACH resource, generate RAR message, and in this preamble In the cell sending or SeNB PCell, this UE SeNB RAR is dispatched by the PDCCH that RA-RNTI scrambles.Can using with In embodiment two, the mode one providing or mode three identical mode distinguish UE, such as can embody transmission in RA-RNTI The SeNB cell identity information of Preamble.UE detects whether the SeNB RAR for oneself on the CSS of MeNB PCell, If detect RA-RNTI instruction cell be this UE send preamble cell, and the preamble detecting with should The preamble that UE sends is identical, then confirm that this SeNB RAR is for this UE, then UE obtains SeNB from this SeNB RAR and is The information such as TAC, UL-grant, TC-RNTI of its configuration.

Step 1403～1404：Msg3 sends and Msg4（Contention resolved）

In sum, in the embodiment of the present invention, many base stations polymerization particularly carry under detached scene, by UE with The mode that SeNB direct interaction is coordinated, or the Stochastic accessing mistake by way of MeNB assists it is achieved that between UE and SeNB Journey, solves the polymerization of support many base stations and particularly carries random access procedure on SeNB for the detached UE, so achieve with The synchronization of SeNB and from SeNB obtain uplink transmission resource.

Based on identical technology design, the embodiment of the present invention additionally provides terminal and the structure of base station.End shown in Figure 15 End, and the base station shown in Figure 16 and Figure 17, can be applicable to the non-competing random access procedure of above-described embodiment offer.Figure 18 institute The terminal stated, and the base station shown in Figure 19 and Figure 20, can be applicable to the competition random access procedure of above-described embodiment offer.

As shown in figure 15, this terminal may include：

First processing module 1501, for receiving cell-radio network in the cell of main control base station or the cell of slave base stations The physical downlink control channel commands PDCCH order of temporary mark C-RNTI scrambling, obtains described in described PDCCH order The random access lead code resource of the cell of slave base stations and/or Physical Random Access Channel PRACH resource, described Stochastic accessing Lead code is used for the cell initiating random access procedure in described slave base stations；

Second processing module 1502, for the described random access lead code money being got according to described first processing module Source and/or PRACH resource send random access lead code；

3rd processing module 1503, for monitoring Stochastic accessing in the cell of main control base station or the cell of described slave base stations The physical downlink control channel PDCCH of Radio Network Temporary Identifier RA-RNTI scrambling, obtains in described PDCCH and belongs to described end The accidental access response message at end；Wherein, take in the PDCCH of the RA-RNTI scrambling that the cell of described main control base station receives The described accidental access response message of band, is that described slave base stations generate simultaneously according to the random access lead code that described terminal sends It is sent to described main control base station.

Specifically, first processing module 1501 can receive the PDCCH of C-RNTI scrambling in the cell of main control base station After order, obtain described PDCCH order in random access lead code resource and/or PRACH resource, and with described with The mark of the cell of machine access lead code resource and/or the corresponding described slave base stations of PRACH resource；Second processing module 1502 The described random access lead code resource that can be got according to described first processing module and/or PRACH resource and described from Belong to the mark of the cell of base station, send random access lead code in the cell of corresponding slave base stations.

Specifically, the 3rd processing module 1503 can judge whether accidental access response message belongs to described in the following manner Terminal：

Obtain cell ID from described RA-RNTI, if described cell ID and the cell sending random access lead code Mark identical, and the random access lead code detecting is identical with the described random access lead code that described terminal sends, Then the accidental access response message in described PDCCH belongs to described terminal；Or, obtain from described accidental access response message C-RNTI, if described C-RNTI is C-RNTI in the cell sending described random access lead code for the described terminal, described Accidental access response message belongs to described terminal.

Specifically, first processing module 1501 can monitor RA- by the public search space in the main plot of described main control base station The PDCCH of RNTI scrambling.

Specifically, first processing module 1501 in the public search space of the main plot of described slave base stations, or can sent out The public search space sending the cell of described random access lead code monitors the PDCCH that RA-RNTI scrambles.

As shown in figure 16, this base station can be SeNB, and this base station may include：

First processing module 1601, the physical down for sending Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling controls Channel command PDCCH order, or, will be the random access lead code resource of terminal distribution and/or PRACH resource is sent to The cell of main control base station, so that described main control base station sends the PDCCH order of C-RNTI scrambling；In described PDCCH order Carry the random access lead code resource that described slave base stations are terminal distribution and/or PRACH resource, described random access guiding Code is for the cell initiating random access procedure in described slave base stations；

Second processing module 1602, for receiving described terminal according to described random access lead code resource and/or PRACH Resource sends random access lead code；

3rd processing module 1603, for dispatching the PDCCH of random access radio network temporary mark RA-RNTI scrambling, Or, the accidental access response message for described terminal is sent to the cell of described main control base station, so that described master control base The PDCCH that the scheduling RA-RNTI that stands scrambles；The accidental access response message for described terminal is carried in described PDCCH.

Specifically, also carry in described PDCCH order and described random access lead code resource and/or PRACH resource The mark of the cell of corresponding slave base stations, so that the mark of the cell according to described slave base stations for the described terminal is corresponding little Area sends random access lead code.

Specifically, carry the mark of the cell of described slave base stations in described RA-RNTI；And/or, described Stochastic accessing rings Answer and in message, carry C-RNTI, described C-RNTI is C- in the cell sending described random access lead code for the described terminal RNTI.

Specifically, the 3rd processing module 1603 can be in the main plot of described slave base stations or before sending described Stochastic accessing The cell of leading code, the PDCCH of scheduling RA-RNTI scrambling.

As shown in figure 17, this base station can be MeNB, and this base station may include：

First forwarding module 1701, for receive slave base stations be terminal distribution random access lead code resource and/or Physical Random Access Channel PRACH resource, and send the physical down control of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling Order PDCCH order, carries the random access lead code money that described slave base stations are terminal distribution in described PDCCH order Source and/or PRACH resource, described random access lead code is used for the cell initiating random access procedure in described slave base stations； And/or

Second forwarding module 1702, disappears for receiving the accidental access response for described terminal that slave base stations send Breath, and dispatch the PDCCH of random access radio network temporary mark RA-RNTI scrambling, carry for described end in described PDCCH The accidental access response message at end.

Specifically, also carry in described PDCCH order and described random access lead code resource and/or PRACH resource The mark of the cell of corresponding slave base stations, the mark of the cell of described slave base stations is that described slave base stations are sent to described master Control base station, so that the mark of the cell according to described slave base stations for the described terminal sends random access guiding in corresponding cell Code.

Specifically, the second forwarding module 1702 can send RA-RNTI scrambling in the main plot of described main control base station PDCCH.

As shown in figure 18, this terminal may include：

First processing module 1801, sends random access lead code for the cell in slave base stations；

Second processing module 1802, monitors random access radio network temporary mark for the cell in described slave base stations The physical downlink control channel PDCCH of RA-RNTI scrambling, obtains the accidental access response belonging to described terminal in described PDCCH Message；Or, monitor the PDCCH of RA-RNTI scrambling in the cell of main control base station, obtain in described PDCCH and belong to described terminal Accidental access response message, described accidental access response message is that described slave base stations connect at random according to what described terminal sent Enter lead code to generate and send to described main control base station；

3rd processing module 1803, for sending scheduled transmission message in the cell sending described random access lead code；

Fourth processing module 1804, in the cell detection contention resolution message sending described random access lead code.

Further, first processing module 1801 also can slave base stations cell send random access lead code before, Select lead code in specified random access lead code group, the lead code in described specified random access lead code group is exclusively used in end End is initiated competition random access procedure in slave base stations and is used；First processing module 1801 can slave base stations cell send from The lead code selecting in described specified random access lead code group.

Further, first processing module 1801 also can slave base stations cell send random access lead code before, PRACH, the PRACH in described specified PRACH group is selected to be exclusively used in terminal and exist in specified Physical Random Access Channel PRACH group Slave base stations are initiated competition random access procedure and are used；First processing module 1801 can be selected according to from described specified PRACH group The PRACH selecting, sends random access lead code in the cell of slave base stations.

Further, first processing module 1801 also can slave base stations cell send random access lead code before, Select to specify lead code form and PRACH corresponding with described specified lead code form, described specified lead code form is special Initiate competition random access procedure in terminal in slave base stations to use；First processing module 1801 can be described specified according to select Lead code form and PRACH corresponding with described specified lead code form, before the cell of slave base stations sends Stochastic accessing Leading code.

Specifically, Second processing module 1802 can judge whether accidental access response message belongs to described in the following manner Terminal：Obtain cell ID from described RA-RNTI, if described cell ID and the cell sending described random access lead code Mark identical, and the random access lead code detecting is identical with the described random access lead code that described terminal sends, Then the accidental access response message in described PDCCH belongs to described terminal.

Specifically, Second processing module 1802 can monitor RA- by the public search space in the main plot of described main control base station The PDCCH of RNTI scrambling.

Specifically, Second processing module 1802 can in the public search space of the main plot of described slave base stations, or Send the public search space of the cell of described random access lead code, monitor the PDCCH of RA-RNTI scrambling.

As shown in figure 19, this base station can be SeNB, and this base station may include：

First processing module 1901, the random access lead code sending for receiving terminal；

Second processing module 1902, the random access lead code for being sent according to described terminal generates and is directed to described terminal Accidental access response message, add in the cell scheduling random access radio network temporary mark RA-RNTI of described slave base stations The physical downlink control channel PDCCH disturbed, or described accidental access response message is sent to the cell of main control base station, so that Described main control base station dispatches the physical downlink control channel PDCCH of random access radio network temporary mark RA-RNTI scrambling；Its In, carry the accidental access response message for described terminal in described PDCCH；

3rd processing module 1903, for receiving, in the cell sending described lead code, the scheduled transmission that described terminal sends Message；

Fourth processing module 1904, for, after Stochastic accessing contention resolved, sending in the cell sending described lead code Contention resolution message.

Specifically, random access lead code is the lead code specified in random access lead code group, and described specifying connects at random Enter the lead code in leading code character and be exclusively used in terminal in slave base stations initiation competition random access procedure use.

Specifically, the Physical Random Access Channel PRACH listening to described random access lead code is to specify in PRACH group PRACH, the PRACH in described specified PRACH group be exclusively used in terminal slave base stations initiate competition random access procedure use.

Specifically, described random access lead code is to specify lead code form, and described specified lead code form is exclusively used in end End is initiated competition random access procedure in slave base stations and is used.

Specifically, carry the mark of the cell of described slave base stations in described RA-RNTI.

Specifically, Second processing module 1902 can be in the main plot of described slave base stations or before sending described Stochastic accessing The cell of leading code, the PDCCH of scheduling RA-RNTI scrambling.

As shown in figure 20, this base station can be MeNB, and this base station may include：

Receiver module 2001, the accidental access response message that the cell for receiving slave base stations sends；

Forwarding module 2002, for dispatching the physical down control of random access radio network temporary mark RA-RNTI scrambling Channel PDCCH processed, carries described accidental access response message in described PDCCH.

Specifically, forwarding module 2002 can dispatch the PDCCH of RA-RNTI scrambling in the main plot of described main control base station.

The present invention is with reference to method according to embodiments of the present invention, equipment（System）, and computer program flow process Figure and/or block diagram are describing.It should be understood that can be by each stream in computer program instructions flowchart and/or block diagram Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processor instructing general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device is to produce A raw machine is so that produced for reality by the instruction of computer or the computing device of other programmable data processing device The device of the function of specifying in present one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.

These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing device with spy Determine in the computer-readable memory that mode works so that the instruction generation inclusion being stored in this computer-readable memory refers to Make the manufacture of device, this command device realize in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or The function of specifying in multiple square frames.

These computer program instructions also can be loaded in computer or other programmable data processing device so that counting On calculation machine or other programmable devices, execution series of operation steps to be to produce computer implemented process, thus in computer or On other programmable devices, the instruction of execution is provided for realizing in one flow process of flow chart or multiple flow process and/or block diagram one The step of the function of specifying in individual square frame or multiple square frame.

Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to including excellent Select embodiment and fall into being had altered and changing of the scope of the invention.

Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprise these changes and modification.

Claims

1. a kind of non-competing accidental access method is it is characterised in that include：

Terminal receives Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling in the cell of main control base station or the cell of slave base stations Physical downlink control channel commands PDCCH order, obtains the random of the cell of slave base stations described in described PDCCH order Access lead code resource and/or Physical Random Access Channel PRACH resource, described random access lead code is used in described subordinate The cell initiating random access procedure of base station；

Described terminal monitors random access radio network temporary mark in the cell of main control base station or the cell of described slave base stations The physical downlink control channel PDCCH of RA-RNTI scrambling, obtains the accidental access response belonging to described terminal in described PDCCH Message；Wherein, the described Stochastic accessing carrying in the PDCCH of the RA-RNTI scrambling that the cell of described main control base station receives Response message, is that described slave base stations generate and send to described master control base according to the random access lead code that described terminal sends Stand.

2. the method for claim 1 is it is characterised in that obtain the little of slave base stations described in described PDCCH order The random access lead code resource in area and/or PRACH resource, including：

Described terminal, after the cell of main control base station receives the PDCCH order of C-RNTI scrambling, obtains described PDCCH Random access lead code resource in order and/or PRACH resource, and with described random access lead code resource and/or The mark of the cell of the corresponding described slave base stations of PRACH resource；

Described terminal sends random access lead code according to described random access lead code resource and/or PRACH resource, including：

Described terminal is according to the cell of described random access lead code resource and/or PRACH resource and described slave base stations Mark, sends random access lead code in the cell of corresponding slave base stations.

3. the method for claim 1 is it is characterised in that described terminal judges that accidental access response disappears in the following manner Whether breath belongs to described terminal：

Obtain cell ID from described RA-RNTI, if the mark of the cell of described cell ID and transmission random access lead code Sensible same, and the random access lead code detecting is identical with the described random access lead code that described terminal sends, then institute State the accidental access response message in PDCCH and belong to described terminal；Or

Obtain C-RNTI from described accidental access response message, if described C-RNTI is described terminal described connecing at random sending Enter the C-RNTI in the cell of lead code, then described accidental access response message belongs to described terminal.

4. the method as any one of claim 1-3 is it is characterised in that described terminal is monitored in the cell of main control base station The PDCCH of RA-RNTI scrambling, including：

The public search space of the main plot in described main control base station for the described terminal, monitors the PDCCH of RA-RNTI scrambling.

5. the method as any one of claim 1-3 it is characterised in that described terminal described slave base stations cell Monitor the PDCCH of RA-RNTI scrambling, including：

The public search space of the main plot in described slave base stations for the described terminal, or sending described random access lead code The public search space of cell, monitors the PDCCH of RA-RNTI scrambling.

6. a kind of non-competing accidental access method is it is characterised in that include：

Described slave base stations receive described terminal and are sent at random according to described random access lead code resource and/or PRACH resource Access lead code；

Described slave base stations dispatch the PDCCH of random access radio network temporary mark RA-RNTI scrambling, or, will be for institute The accidental access response message stating terminal is sent to described main control base station, so that described main control base station dispatches RA-RNTI scrambling PDCCH；The accidental access response message for described terminal is carried in described PDCCH.

7. method as claimed in claim 6 is it is characterised in that also carry and described Stochastic accessing in described PDCCH order The mark of the cell of preamble resource and/or the corresponding slave base stations of PRACH resource, so that described terminal is according to described subordinate base The mark of the cell stood sends random access lead code in corresponding cell.

8. method as claimed in claim 6 is it is characterised in that carry the cell of described slave base stations in described RA-RNTI Mark；And/or

C-RNTI is carried, described C-RNTI is described terminal before sending described Stochastic accessing in described accidental access response message C-RNTI in the cell of leading code.

9. the method as any one of claim 6-8 is it is characterised in that described slave base stations scheduling RA-RNTI scrambles PDCCH, including：

Described slave base stations are in the main plot of described slave base stations or in the cell sending described random access lead code, scheduling The PDCCH of RA-RNTI scrambling.

10. a kind of non-competing accidental access method is it is characterised in that include：

Main control base station receives the random access lead code resource that slave base stations are terminal distribution and/or Physical Random Access Channel PRACH resource, and send the physical down control command PDCCH order of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling, The random access lead code resource that described slave base stations are terminal distribution and/or PRACH money is carried in described PDCCH order Source, described random access lead code is used for the cell initiating random access procedure in described slave base stations；And/or

Described main control base station receives the accidental access response message for described terminal that slave base stations send, and dispatches random Access the PDCCH of Radio Network Temporary Identifier RA-RNTI scrambling, in described PDCCH, carry the Stochastic accessing for described terminal Response message.

11. methods as claimed in claim 10 are connect it is characterised in that also carrying in described PDCCH order at random with described Enter the mark of the cell of preamble resource and/or the corresponding slave base stations of PRACH resource, the mark of the cell of described slave base stations It is that described slave base stations are sent to described main control base station, so that the mark of the cell according to described slave base stations for the described terminal exists Corresponding cell sends random access lead code.

12. methods as claimed in claim 10 are it is characterised in that carry the cell of described slave base stations in described RA-RNTI Mark；And/or

13. methods as any one of claim 10-12 are it is characterised in that described main control base station scheduling RA-RNTI adds The PDCCH disturbing, including：

Described main control base station dispatches the PDCCH of RA-RNTI scrambling in the main plot of described main control base station.

A kind of 14. terminals are it is characterised in that include：

First processing module, for receiving Cell Radio Network Temporary Identifier/Identity, Cell-RNTI in the cell of main control base station or the cell of slave base stations The physical downlink control channel commands PDCCH order of C-RNTI scrambling, obtains slave base stations described in described PDCCH order The random access lead code resource of cell and/or Physical Random Access Channel PRACH resource, described random access lead code uses In the cell initiating random access procedure in described slave base stations；

Second processing module, for the described random access lead code resource that got according to described first processing module and/or PRACH resource sends random access lead code；

3rd processing module, for monitoring random access radio network in the cell of main control base station or the cell of described slave base stations The physical downlink control channel PDCCH of temporary mark RA-RNTI scrambling, obtains in described PDCCH and belongs to the random of described terminal Access response message；Wherein, described in carrying in the PDCCH of the RA-RNTI scrambling that the cell of described main control base station receives Accidental access response message, is that described slave base stations generate and send to institute according to the random access lead code that described terminal sends State main control base station.

15. terminals as claimed in claim 14 are it is characterised in that described first processing module is specifically in main control base station Cell receive C-RNTI scrambling PDCCH order after, obtain described PDCCH order in random access lead code money Source and/or PRACH resource, and with described random access lead code resource and/or the corresponding described slave base stations of PRACH resource Cell mark；

Described Second processing module is specifically for the described random access lead code money being got according to described first processing module The mark of the cell of source and/or PRACH resource and described slave base stations, sends in the cell of corresponding slave base stations and connects at random Enter lead code.

16. terminals as claimed in claim 14 are it is characterised in that described 3rd processing module is specifically for by with lower section Formula judges whether accidental access response message belongs to described terminal：

17. terminals as any one of claim 14-16 it is characterised in that described first processing module specifically for, Public search space in the main plot of described main control base station monitors the PDCCH of RA-RNTI scrambling.

18. terminals as any one of claim 14-16 it is characterised in that described first processing module specifically for, In the public search space of the main plot of described slave base stations, or search in the public of cell sending described random access lead code The PDCCH of RA-RNTI scrambling is monitored in rope space.

It is characterised in that described base station is slave base stations, described slave base stations include for a kind of 19. base stations：

First processing module, for sending the physical downlink control channel commands of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling PDCCH order, or, will be the random access lead code resource of terminal distribution and/or PRACH resource is sent to main control base station Cell so that described main control base station send C-RNTI scrambling PDCCH order；Carry described in described PDCCH order Slave base stations are random access lead code resource and/or the PRACH resource of terminal distribution, and described random access lead code is used for The cell initiating random access procedure of described slave base stations；

Second processing module, sends according to described random access lead code resource and/or PRACH resource for receiving described terminal Random access lead code；

3rd processing module, for dispatching the PDCCH of random access radio network temporary mark RA-RNTI scrambling, or, by pin The cell of described main control base station is sent to the accidental access response message of described terminal, so that described main control base station scheduling RA- The PDCCH of RNTI scrambling；The accidental access response message for described terminal is carried in described PDCCH.

20. base stations as claimed in claim 19 are connect it is characterised in that also carrying in described PDCCH order at random with described Enter the mark of the cell of preamble resource and/or the corresponding slave base stations of PRACH resource, so that described terminal is according to described subordinate The mark of the cell of base station sends random access lead code in corresponding cell.

21. base stations as claimed in claim 19 are it is characterised in that carry the cell of described slave base stations in described RA-RNTI Mark；And/or

22. base stations as any one of claim 19-21 it is characterised in that described 3rd processing module specifically for, In the main plot of described slave base stations or in the cell sending described random access lead code, scheduling RA-RNTI scrambling PDCCH.

It is characterised in that described base station is main control base station, described main control base station includes for a kind of 23. base stations：

First forwarding module, for receiving the random access lead code resource that slave base stations are terminal distribution and/or physical accidental Access channel PRACH resource, and send physical down control command PDCCH of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI scrambling Order, carry in described PDCCH order described slave base stations be terminal distribution random access lead code resource and/or PRACH resource, described random access lead code is used for the cell initiating random access procedure in described slave base stations；And/or

Second forwarding module, for receiving the accidental access response message for described terminal that slave base stations send, and adjusts Degree random access radio network temporary mark RA-RNTI scrambling PDCCH, carry in described PDCCH for described terminal with Machine accesses response message.

24. base stations as claimed in claim 23 are connect it is characterised in that also carrying in described PDCCH order at random with described Enter the mark of the cell of preamble resource and/or the corresponding slave base stations of PRACH resource, the mark of the cell of described slave base stations It is that described slave base stations are sent to described main control base station, so that the mark of the cell according to described slave base stations for the described terminal exists Corresponding cell sends random access lead code.

25. base stations as claimed in claim 23 are it is characterised in that carry the cell of described slave base stations in described RA-RNTI Mark；And/or

26. base stations as any one of claim 23-25 it is characterised in that described second forwarding module specifically for, Send the PDCCH of RA-RNTI scrambling in the main plot of described main control base station.

A kind of 27. competitive random access method are it is characterised in that include：

Terminal sends random access lead code in the cell of slave base stations；

Described terminal monitors, in the cell of described slave base stations, the physics that random access radio network temporary mark RA-RNTI scrambles Down control channel PDCCH, obtains the accidental access response message belonging to described terminal in described PDCCH；Or, in master control base The cell stood monitors the PDCCH of RA-RNTI scrambling, obtains the accidental access response message belonging to described terminal in described PDCCH, Described accidental access response message is that described slave base stations generate and send according to the random access lead code that described terminal sends To described main control base station；

28. methods as claimed in claim 27 are it is characterised in that terminal sends random access guiding in the cell of slave base stations Before code, also include：

Described terminal selects lead code in specified random access lead code group, in described specified random access lead code group before Leading code is exclusively used in terminal and initiates competition random access procedure use in slave base stations；

Described terminal sends random access lead code in the cell of slave base stations, including：

Described terminal sends, in the cell of slave base stations, the lead code selecting from described specified random access lead code group.

29. methods as claimed in claim 27 are it is characterised in that terminal sends random access guiding in the cell of slave base stations Before code, also include：

Described terminal selects PRACH, the PRACH in described specified PRACH group in specified Physical Random Access Channel PRACH group It is exclusively used in terminal and initiate competition random access procedure use in slave base stations；

Described terminal according to from described specified PRACH group select PRACH, slave base stations cell send Stochastic accessing before Leading code.

30. methods as claimed in claim 27 are it is characterised in that terminal sends random access guiding in the cell of slave base stations Before code, also include：

Described terminal selects to specify lead code form and PRACH corresponding with described specified lead code form, described specify before Leading code form is exclusively used in terminal and initiates competition random access procedure use in slave base stations；

Described terminal according to the described specified lead code form selecting and PRACH corresponding with described specified lead code form, Send random access lead code in the cell of slave base stations.

31. methods as any one of claim 27-30 are it is characterised in that described terminal judges in the following manner Whether accidental access response message belongs to described terminal：

Obtain cell ID from described RA-RNTI, if described cell ID and the cell sending described random access lead code Mark identical, and the random access lead code detecting is identical with the described random access lead code that described terminal sends, Then the accidental access response message in described PDCCH belongs to described terminal.

32. methods as any one of claim 27-30 it is characterised in that described terminal main control base station cell Monitor the PDCCH of RA-RNTI scrambling, including：

The public search space of the main plot in described main control base station for the described terminal monitors the PDCCH of RA-RNTI scrambling.

33. methods as any one of claim 27-30 are it is characterised in that described terminal is in described slave base stations Cell monitors the PDCCH of RA-RNTI scrambling, including：

The public search space of the main plot in described slave base stations for the described terminal, or sending described random access lead code Cell public search space, monitor RA-RNTI scrambling PDCCH.

A kind of 34. competitive random access method are it is characterised in that include：

Described slave base stations are rung according to the Stochastic accessing that the random access lead code that described terminal sends generates for described terminal Answer message, dispatch the physical downlink control channel PDCCH of random access radio network temporary mark RA-RNTI scrambling, or will Described accidental access response message is sent to main control base station, so that described main control base station dispatches the PDCCH of RA-RNTI scrambling；Its In, carry the accidental access response message for described terminal in described PDCCH；

Described slave base stations receive, in the cell sending described lead code, the scheduled transmission message that described terminal sends, and random After access contention solves, send contention resolution message in the cell sending described lead code.

35. methods as claimed in claim 34 are it is characterised in that described random access lead code is to specify random access guiding Lead code in code character, the lead code in described specified random access lead code group is exclusively used in terminal and initiates competition in slave base stations Random access procedure uses.

36. methods as claimed in claim 34 are it is characterised in that the physical accidental listening to described random access lead code connects Entering channel PRACH is the PRACH specifying in PRACH group, and the PRACH in described specified PRACH group is exclusively used in terminal in subordinate base Initiation competition random access procedure of standing uses.

37. methods as claimed in claim 34 it is characterised in that described random access lead code be specify lead code form, Described specified lead code form is exclusively used in terminal and initiates competition random access procedure use in slave base stations.

38. methods as any one of claim 34-37 are it is characterised in that carry described subordinate in described RA-RNTI The mark of the cell of base station.

39. methods as any one of claim 34-37 are it is characterised in that described slave base stations transmission RA-RNTI adds The PDCCH disturbing, including：

Described slave base stations, in the main plot of described slave base stations or in the cell sending described random access lead code, send The PDCCH of RA-RNTI scrambling.

A kind of 40. competitive random access method are it is characterised in that include：

41. methods as claimed in claim 40 are it is characterised in that carry the cell of described slave base stations in described RA-RNTI Mark.

42. methods as described in claim 40 or 41 are it is characterised in that described main control base station dispatches RA-RNTI scrambling PDCCH, including：

A kind of 43. terminals are it is characterised in that include：

Second processing module, monitors random access radio network temporary mark RA-RNTI for the cell in described slave base stations The physical downlink control channel PDCCH of scrambling, obtains the accidental access response message belonging to described terminal in described PDCCH；Or Person, monitors the PDCCH of RA-RNTI scrambling, obtains in described PDCCH and belong to connecing at random of described terminal in the cell of main control base station Enter response message, described accidental access response message is the random access lead code that described slave base stations send according to described terminal Generate and send to described main control base station；

44. terminals as claimed in claim 43 it is characterised in that first processing module is additionally operable to, in the cell of slave base stations Before sending random access lead code, select lead code in specified random access lead code group, before described specified Stochastic accessing Lead code in leading code group is exclusively used in terminal and initiates competition random access procedure use in slave base stations；

Described first processing module is specifically for sending from described specified random access lead code group in the cell of slave base stations The lead code selecting.

45. terminals as claimed in claim 43 are it is characterised in that described first processing module is additionally operable to, in slave base stations Before cell sends random access lead code, specified Physical Random Access Channel PRACH group selects PRACH, described specified PRACH in PRACH group is exclusively used in terminal and initiates competition random access procedure use in slave base stations；

Described first processing module is specifically for according to the PRACH selecting from described specified PRACH group, in slave base stations Cell sends random access lead code.

46. terminals as claimed in claim 43 are it is characterised in that described first processing module is additionally operable to, in slave base stations Before cell sends random access lead code, select to specify lead code form and corresponding with described specified lead code form PRACH, described specified lead code form is exclusively used in terminal and initiates competition random access procedure use in slave base stations；

Described first processing module specifically for, according to select described specified lead code form and with described specified lead code The corresponding PRACH of form, sends random access lead code in the cell of slave base stations.

47. terminals as any one of claim 43-46 it is characterised in that described Second processing module specifically for, Judge whether accidental access response message belongs to described terminal in the following manner：

48. terminals as any one of claim 43-46 it is characterised in that described Second processing module specifically for, Public search space in the main plot of described main control base station monitors the PDCCH of RA-RNTI scrambling.

49. terminals as any one of claim 43-46 it is characterised in that described Second processing module specifically for, In the public search space of the main plot of described slave base stations or public in the cell sending described random access lead code Search space, monitors the PDCCH of RA-RNTI scrambling.

It is characterised in that described base station is slave base stations, described slave base stations include for a kind of 50. base stations：

Second processing module, the random access lead code for being sent according to described terminal generates connecing at random for described terminal Enter response message, in the physics of the cell scheduling random access radio network temporary mark RA-RNTI scrambling of described slave base stations Down control channel PDCCH, or described accidental access response message is sent to the cell of main control base station, so that described master control The physical downlink control channel PDCCH of base station scheduling random access radio network temporary mark RA-RNTI scrambling；Wherein, described The accidental access response message for described terminal is carried in PDCCH；

3rd processing module, for receiving, in the cell sending described lead code, the scheduled transmission message that described terminal sends；

Fourth processing module, for, after Stochastic accessing contention resolved, sending contention resolved in the cell sending described lead code Message.

51. base stations as claimed in claim 50 are it is characterised in that described random access lead code is to specify random access guiding Lead code in code character, the lead code in described specified random access lead code group is exclusively used in terminal and initiates competition in slave base stations Random access procedure uses.

52. base stations as claimed in claim 50 are it is characterised in that the physical accidental listening to described random access lead code connects Entering channel PRACH is the PRACH specifying in PRACH group, and the PRACH in described specified PRACH group is exclusively used in terminal in subordinate base Initiation competition random access procedure of standing uses.

53. base stations as claimed in claim 50 it is characterised in that described random access lead code be specify lead code form, Described specified lead code form is exclusively used in terminal and initiates competition random access procedure use in slave base stations.

54. base stations as any one of claim 50-53 are it is characterised in that carry described subordinate in described RA-RNTI The mark of the cell of base station.

55. base stations as any one of claim 50-53 it is characterised in that described Second processing module specifically for, In the main plot of described slave base stations or in the cell sending described random access lead code, scheduling RA-RNTI scrambling PDCCH.

It is characterised in that described base station is main control base station, described main control base station includes for a kind of 56. base stations：

Forwarding module, for dispatching the Physical Downlink Control Channel of random access radio network temporary mark RA-RNTI scrambling PDCCH, carries described accidental access response message in described PDCCH.

57. base stations as claimed in claim 56 are it is characterised in that carry the cell of described slave base stations in described RA-RNTI Mark.

58. base stations as described in claim 56 or 57 are it is characterised in that described forwarding module is specifically in described master control The PDCCH of RA-RNTI scrambling is dispatched in the main plot of base station.