CN102223658B - A kind of method processing Radio Link Failure and via node - Google Patents
A kind of method processing Radio Link Failure and via node Download PDFInfo
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Abstract
The invention discloses a kind of method processing Radio Link Failure, including: via node (RN) detects Rule of judgment according to the Radio Link Failure (RLF) preset, and the RLF of Un interface is detected；When detecting that RLF occurs Un interface, RN selects return to wireless heterogeneous networks (RRC) idle condition and rebuild the RRC connection of Un interface by random access operation again, or selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status.The invention also discloses a kind of via node.By the method for the present invention and via node, it is achieved that the RN effective detection to Un interface RLF, and there is the process after RLF.
Description
Technical field
The present invention relates to the relaying technique of wireless communication field, particularly relate to a kind of method processing Radio Link Failure and via node.
Background technology
Within a wireless communication network, the wired backbone network that some areas cannot be carried out ordinary base station due to landform or environment reason is had to connect, or some are covered dead angle or hot zones has provisional wireless coverage demand, but the base station equipment of erection wired connection is relatively costly.For these wireless coverage demands, wireless relay (Relay) equipment generally can be adopted to solve, as shown in Figure 1, Relay equipment is connected by wireless signal with existing network base station, and provide service to the UE in self coverage, thus realizing coverage extension, reducing and covering dead angle, shift the purposes such as hot zones load.
Wireless relay is one of technology of supporting of senior Long Term Evolution (LTE-A, LongTermEvolution-Advanced).In lte-a system, with via node (RN, RelayNode) base station carrying out wireless connections is called donor base station (DeNB, DonoreNB), wireless link between DeNB and RN is called back haul link (backhaullink), and its air interface is called Un interface.Wireless link between RN and UE is called access link (accesslink), and its air interface is called Uu interface.RN serves as the role of an eNB for the UE of its service, then serves as a UE role for its DeNB.Downlink data first arrives DeNB, then passes to RN, RN again and transmits to UE again；Otherwise up then.
Lte-a system mainly uses " first kind wireless relay " (Type1Relay), so-called first kind wireless relay, refers to the wireless relay nodes possessing techniques below feature:
1, for the UE under relay node services, the new community that via node is formed is an individual cell, is different from DeNB community；
2, Relay community has independent physical area to identify (PCI, PhysicalCellID), and the physical signalling such as synchronizing signal and reference signal of broadcasting oneself in community；
3, the UE under relay node services directly receives up-downgoing scheduling and feedback information from via node, also directly sends ascending control information to via node；
4, UE, the Relay community of LTE version 8 (Rel8) and the eNB community of common Rel8 is as broad as long.
For access link, its air interface should follow LTERel8 standard.Via node is possibly used the frequency identical with back haul link at access link, and this via node is called via node (In-bandRelayNode) in band；Or via node uses the frequency different from back haul link at access link, this via node is called the outer via node of band (Out-of-bandRelayNode).If access link uses identical frequency with back haul link, then via node simultaneously at Un interface downlink data and at Uu interface transmission downlink data, or can not send upstream data and at Uu interface upstream data at Un interface simultaneously.For this, the data transmit-receive of Un interface and Uu interface should take the mode of timesharing to carry out, and when RN is when Un interface downlink data, then stops at Uu interface and sends downlink data to UE；Same, when RN is when Uu interface upstream data, then stop at Un interface and send upstream data.Prior art can be passed through to configure multi-media broadcasting service Single Frequency Network (MBSFN at Uu interface, Multi-mediaBroadcastmulticastserviceSingleFrequencyNetwo rk) subframe to be to inform UE not downlink data receiving within the time that these subframes are corresponding, correspondingly, RN can at Un mouth downlink data receiving within the time that MBSFN sub-frame is corresponding.But, UE need nonetheless remain for downlink data receiving in 2 symbol times of MBSFN sub-frame, in order to avoid missing paging and system message update.
RN works in the way of being similar to common UE at Un interface, and its chain of command and user plane protocol stack architecture are identical with the protocol stack structure of definition in LTERel-8.RN sets up wireless heterogeneous networks (RRC at Un interface, RadioResourceControl) mode connected is also similar with common UE, RN sets up RRC connection by initiating Stochastic accessing (RandomAccess) process under idle (RRC_IDLE) state of RRC, enters RRC and connects (RRC_Connected) state.The RN entering RRC_Connected state can start to provide the backhaul relay service of data for the UE under its service.
Owing to Un interface is wave point, its channel quality is likely to be due to a variety of causes to be occurred declining, may result in the bit error rate when serious to be too high to continue to provide data transport service, this situation is called Radio Link Failure (RLF, RadioLinkFailure).
According to current LTERel-8 agreement, by following condition, UE judges whether air interface RLF occurs:
If 1 continuously receives the N number of step-out from physical layer of preset value (out-of-sync) instruction, and do not continuously receive preset value M before intervalometer T time-out to synchronize (in-sync) from the recovery of physical layer and indicate, then UE thinks and there occurs RLF；
If 2 random access failures received from medium education (MAC, MediumAccessControl) layer indicate, namely continuous random accesses number of times and has been maxed out value and remain without successfully, then UE thinks and there occurs RLF；
If 3 receive the instruction from wireless spread-spectrum technology (RLC, RadioLinkControl) layer, had rlc protocol data cell (PDU, ProtocolDataUnit) to reach maximum retransmission, then UE thinks and there occurs RLF.
When UE detects generation RLF, if Access Layer (AS, AccessStratum) security mechanism is activated, then return to RRC_IDLE state from RRC_Connected state；When UE detects generation RLF, if AS security mechanism is not activated, then UE starts radio resource control connection reestablishment (re-establishment) program, it is intended to again recovers normal RRC and connects.
For RN, need to keep RRC to be connected with DeNB as the role of a UE at Un interface, and need to keep with multiple UE of its service RRC to connect as the role of an eNB at Uu interface.When there is RLF in Un mouth, RN is different from common UE for the detection judgement of RLF and the processing method of correspondence, but, prior art also cannot provide a kind of RN of enabling effectively to detect the RLF of Un interface the method making suitably process when RLF occurs Un interface.
Summary of the invention
In view of this, present invention is primarily targeted at a kind of method processing Radio Link Failure of offer and via node, to realize the RN effective detection to Un interface RLF, and the process after RLF occurs.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
The invention provides a kind of method processing Radio Link Failure, the method includes:
Via node (RN) detects Rule of judgment according to the Radio Link Failure (RLF) preset, and the RLF of Un interface is detected；
When detecting that RLF occurs Un interface, described RN selects return to wireless heterogeneous networks (RRC) idle condition and rebuild the RRC connection of Un interface by random access operation again, or selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status.
Described RLF detects Rule of judgment: continuous step-out instruction or wireless spread-spectrum technology (RLC) layer instruction protocol Data Unit (PDU) reach maximum retransmission or medium education (MAC) layer instruction dispatch request (SR) reaches maximum number of times of transmission.
Described RN indicates SR to reach maximum number of times of transmission according to MAC layer, and the RLF of Un interface is detected, particularly as follows:
Described RN receives the instruction from MAC layer from rrc layer, if it is indicated that show that SR transmission times reaches the maximum number of times of transmission preset, then judges that Un interface there occurs RLF；Otherwise, it is judged that RLF does not occur Un interface.
Described RN selects return to RRC idle condition and rebuild the RRC connection of Un interface by random access operation again, particularly as follows:
RN discharges all Un interface radio resources, and send RRC connection release message to the user terminal (UE) of all RRC of being in connection status of its service, discharge all Uu interface radio resources relevant to the UE that it services, stop Uu interface wireless signal and send, close RN community；In described RRC connection release message, instruction release cause is the RLF of Un interface；
Described RN enters RRC idle condition, searches for self pre-configured community, and selects the community initiation Stochastic accessing that signal intensity meets access conditions to re-establish RRC connection.
The all Un interface radio resources of described release, including: reset Un interface MAC entity, release Un interface RLC and PDCP (PDCP) entity, release Un interface MAC configuration, stop the interface related intervalometer of all Un；
The all Uu interface radio resources relevant to the UE that it services of described release, including: reset Uu interface MAC entity, release Uu interface RLC and PDCP entity, stop the interface related intervalometer of all Uu.
Described RN selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status, particularly as follows:
Stopping recovering synchronous timer, temporary suspension Un interface connects except all radio bearers (RB) of Signaling Radio Bearer (SRB0), reset Un interface MAC entity, and Un interface MAC entity and each physical channel are adopted default configuration；
Search for self pre-configured community, select signal intensity to meet the community of access conditions, and start Stochastic accessing intervalometer；
Initiate Stochastic accessing at Un interface, send special random access preamble signal to donor base station (DeNB), and control channel-monitoring accidental access response (RAR) message at Un interface downlink；After receiving RAR message, send according to the upstream data carried in RAR message and authorize (ULGrant) to send RRC connection reconstruction request message to DeNB；
If Stochastic accessing timer expiry and RN does not receive the RRC connection reconstruction message from DeNB, then interrupt process of reconstruction, return RRC idle condition；If receiving RRC connection reconstruction message before Stochastic accessing timer expiry, then stop Stochastic accessing intervalometer, the RB recovering Un interface connects, apply the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in described RRC connection reconstruction message, and send RRC connection reconstruction completion message to DeNB, described Un interface special parameter comprises Un interface downlink sub-frame configuration.
Present invention also offers a kind of via node, including:
RLF detection module, for detecting Rule of judgment according to the RLF preset, detects the RLF of Un interface；
RLF processing module, for when described RLF detection module detects that RLF occurs Un interface, select return to RRC idle condition and rebuild the RRC connection of Un interface by random access operation again, or select to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status.
Described RLF detects Rule of judgment: continuous step-out instruction or rlc layer instruction PDU reach maximum retransmission or MAC layer instruction SR reaches maximum number of times of transmission.
Described RLF detection module is further used for, and receives the instruction from MAC layer from rrc layer, when instruction shows that SR transmission times reaches the maximum number of times of transmission preset, it is judged that Un interface there occurs RLF；Otherwise, it is judged that RLF does not occur Un interface.
Described RLF processing module is further used for, discharge all Un interface radio resources, and send RRC connection release message to all UE being in RRC connection status of RN service, discharge all Uu interface radio resources relevant to the UE that it services, stop Uu interface wireless signal to send, close RN community；In described RRC connection release message, instruction release cause is the RLF of Un interface；Enter RRC idle condition, the community that search RN is pre-configured, and select the community initiation Stochastic accessing that signal intensity meets access conditions to re-establish RRC connection.
Described RLF processing module is further used for, and stops recovering synchronous timer, and temporary suspension Un interface connects except all RB of SRB0, reset Un interface MAC entity, and Un interface MAC entity and each physical channel are adopted default configuration；The community that search RN is pre-configured, selects signal intensity to meet the community of access conditions, and starts Stochastic accessing intervalometer；
Initiate Stochastic accessing at Un interface, send special random access preamble signal to DeNB, and control channel-monitoring RAR message at Un interface downlink；After receiving RAR message, send RRC connection reconstruction request message to DeNB according to the ULGrant carried in RAR message；
If Stochastic accessing timer expiry is without receiving the RRC connection reconstruction message from DeNB, then interrupts process of reconstruction, return RRC idle condition；If receiving RRC connection reconstruction message before Stochastic accessing timer expiry, then stop Stochastic accessing intervalometer, the RB recovering Un interface connects, apply the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in described RRC connection reconstruction message, and send RRC connection reconstruction completion message to DeNB, described Un interface special parameter comprises Un interface downlink sub-frame configuration.
A kind of method processing Radio Link Failure provided by the present invention and via node, detected Rule of judgment by RN according to the RLF preset, the RLF of Un interface detected；When detecting that RLF occurs Un interface, RN selects return to RRC idle condition and rebuild the RRC connection of Un interface by random access operation again, or selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status.
The new Un mouth Radio Link Failure detection Rule of judgment that the present invention proposes, namely SR reaches maximum number of times of transmission, can increase the RN reliability detected for Un mouth Radio Link Failure further；The present invention proposes the RN processing method for Un mouth Radio Link Failure simultaneously, adds the RN processing procedure at Uu interface especially on the Radio Link Failure processing method basis of existing UE.Pass through the present invention, it is achieved that the RN effective detection to Un interface RLF, and the process after RLF occurs.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the wireless network architecture comprising wireless relay in prior art；
Fig. 2 embodiment of the present invention one processes the method flow diagram of Radio Link Failure；
Fig. 3 embodiment of the present invention two processes the method flow diagram of Radio Link Failure.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
A kind of method processing Radio Link Failure provided by the invention, its core concept is: RN detects Rule of judgment according to the RLF preset, and the RLF of Un interface is detected；When detecting that RLF occurs Un interface, RN selects return to RRC_IDLE state and rebuild the RRC connection of Un interface by random access operation again, or selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC_Connected state.
Wherein, RLF detection Rule of judgment is: continuous step-out instruction or rlc layer instruction PDU reach maximum retransmission or MAC layer indicates dispatch request (SR, SchedulingRequest) to reach maximum number of times of transmission.
RN indicates SR to reach maximum number of times of transmission according to MAC layer, the RLF of Un interface is detected, particularly as follows: RN receives the instruction from MAC layer from rrc layer, if it is indicated that show that SR transmission times reaches the maximum number of times of transmission preset, then judge that Un interface there occurs RLF；Otherwise, it is judged that RLF does not occur Un interface.SR maximum number of times of transmission is passed through RRC parameter configuration by DeNB.
RN indicates according to continuous step-out, the RLF state of Un interface is detected, if indicated particularly as follows: continuously receive the N number of step-out from physical layer of preset value, and do not continuously receive preset value M before intervalometer T time-out and synchronize instruction from the recovery of physical layer, then RN thinks and there occurs RLF.
The RLF state of Un interface, according to rlc layer PDU maximum retransmission, is detected by RN, if particularly as follows: receive the instruction from rlc layer, has had rlc layer PDU to reach maximum retransmission, then RN thinks and there occurs RLF.
In addition, RN selects return to RRC_IDLE state and rebuild the RRC connection of Un interface by random access operation again, specifically include following operation: RN discharges all Un interface radio resources, and send RRC Connection Release (RRCConnectionRelease) message to all UE being in RRC_Connected state of its service, discharge all Uu interface radio resources relevant to the UE that it services, stop Uu interface wireless signal to send, close RN community；Subsequently, RN enters RRC_IDLE state, searches for self pre-configured community, and selects the community initiation Stochastic accessing that signal intensity meets access conditions to re-establish RRC connection.
Wherein, the operation discharging all Un interface radio resources includes: reset Un interface MAC entity, release Un interface RLC and PDCP (PDCP, PacketDataConvergenceProtocol) entity, release Un interface MAC configuration, stop the interface related intervalometer of all Un.The operation discharging all Uu interface radio resources relevant to the UE that it services includes: reset Uu interface MAC entity, release Uu interface RLC and PDCP entity, stop the interface related intervalometer of all Uu.It should be noted that discharge the operation of Un interface radio resources and the priority requirement on having no time that operates of release Uu interface radio resources, certainly also can carry out simultaneously.
RN selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC_Connected state, specifically includes following operation: have been turned on if recovering synchronous timer, then stop recovering synchronous timer；Temporary suspension Un interface removes Signaling Radio Bearer (SRB0, SignalingRadioBearer) all radio bearer (RB, RadioBearer) connect, reset Un interface MAC entity, Un interface MAC entity and each physical channel are adopted default configuration；Search for self pre-configured community, select signal intensity to meet the community of access conditions, and start Stochastic accessing intervalometer TRA；Initiate Stochastic accessing at Un interface, send special random access preamble (RApreamble) signal to DeNB, and control channel-monitoring accidental access response (RAR, RAResponse) message at Un interface downlink；After receiving RAR message, send according to the upstream data carried in RAR message and authorize (ULGrant) to send RRC connection reconstruction request (RRCConnectionReestablishmentRequest) message to DeNB；If Stochastic accessing intervalometer TRATime-out and RN does not receive RRC connection reconstruction (RRCConnectionReestablishment) message from DeNB, then interrupt process of reconstruction, return RRC_IDLE state；If at Stochastic accessing intervalometer TRAReceive RRCConnectionReestablishment message before time-out, then stop Stochastic accessing intervalometer TRAThe RB recovering Un interface connects, new radio-resource-configuration, security parameter and the Un interface special parameter (such as Un interface downlink sub-frame configuration) carried in application RRCConnectionReestablishment message, and complete (RRCConnectionReestablishmentComplete) message to DeNB transmission RRC connection reconstruction.
Below in conjunction with specific embodiment, the method for above-mentioned process Radio Link Failure is further elaborated on.
In embodiments of the invention one, it is assumed that DeNB is the SR maximum number of times of transmission dsr-TransMax=4 of RN configuration.RN has a upstream data to be sent at Un interface, and has triggered SR, SR enumerator in MAC layer and be initially 0.It is being configured with the Transmission Time Interval (TTI of SR resource, TransmissionTimeInterval), the MAC layer instruction physical layer row physically of RN controls channel (PUCCH, PhysicalUplinkControlChannel) sending SR to DeNB on, SR enumerator adds 1 simultaneously.If never receiving the ascending resource mandate from DeNB, the TTI that can send SR at the next one is continued to support that physical layer sends SR to DeNB on PUCCH by RN, and SR enumerator adds 1 simultaneously.So repeat to send SR, until SR enumerator is equal to 4.
When SR enumerator is equal to 4, the Un side MAC layer of RN will reach SR maximum number of times of transmission to rrc layer instruction, and RRC judges that Un mouth has occurred that RLF accordingly, start RLF handling process immediately.
In embodiments of the invention two, RN selects return to RRC_IDLE state and rebuild the RRC connection of Un interface by random access operation again, as in figure 2 it is shown, specifically include following steps:
Step 201, RN is it is determined that Un interface there occurs Radio Link Failure, and selects directly to return RRC_IDLE state.
Step 202, RN sends RRCConnectionRelease message to its all UE being in RRC_Connected state serviced；ReleaseCause parameter in message is set to " Other " or " eNBfailure ", in order to indicate release cause to be the RLF of Un interface.
Step 203, RN discharges all Uu interface radio resources relevant to the UE that it services, including: the MAC entity of reset Uu interface, RLC and the PDCP entity of release Uu interface, stop the interface related intervalometer of all Uu.
Step 204, RN stops Uu interface wireless signal and sends, and closes RN community.
Step 205, RN discharges all Un interface radio resources, including: the MAC entity of reset Un interface, RLC and the PDCP entity of release Un interface, the MAC configuration of release Un interface；Stop all intervalometers.
It should be noted that not free successively requirement between step 205 and step 202～204, step 205 can perform before each step in step 202～204 or perform simultaneously.
Step 206, RN enters RRC_IDLE state, searches for its pre-configured community, it is judged that signal intensity meets whether meet access conditions.
Step 207, if meeting access conditions, then initiates Stochastic accessing and re-establishes RRC connection in this pre-configured community；If being unsatisfactory for access conditions, then RRC connection reconstruction failure.
In embodiments of the invention three, RN selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC_Connected state, as it is shown on figure 3, specifically include following steps:
Step 301, RN is it is determined that Un interface there occurs Radio Link Failure, and selects to initiate RRC connection reconstruction program.
Step 302, stops recovering synchronous timer.
Step 303, temporary suspension Un interface connects except all RB of SRB0, the MAC entity of reset Un interface, and MAC entity and each physical channel to Un interface adopt default configuration.
Step 304, searches for pre-configured cell signal, it is judged that whether its signal intensity meets access conditions.
Step 305, when signal intensity meets access conditions, starts Stochastic accessing intervalometer TRA.
Step 306, RN initiates Stochastic accessing at Un interface, send arbitrary access front signal (RApreamble) to DeNB, and monitor RAR message on relaying Physical Downlink Control Channel (R-PDCCH, Relay-PhysicalDownlinkControlChannel).RApreamble can be special RApreamble, to avoid random access collision, it is also possible to be general non-dedicated RApreamble.
If RN receives RAR message, then perform the operation of subsequent step 307～308；If RN is not received by RAR message, then perform the operation of subsequent step 309.
Step 307, RN receives RAR message, authorizes (ULGrant) by sending according to the upstream data carried in RAR message, sends RRC connection reconstruction request message (RRCConnectionReestablishmentRequest) to DeNB.
Step 308, RN receives RRC connection reconstruction message (RRCConnectionReestablishment) from DeNB, stops Stochastic accessing TRAIntervalometer, the RB recovering Un interface connects, and applies new radio-resource-configuration with, security parameter and Un interface special parameter, sends RRC connection reconstruction completion message (RRCConnectionReestablishmentComplete) to eNB.
So far the RRC connection reconstruction of Un interface completes, and RN can recover to transmit in the data of Un interface.
In above-mentioned process of reconstruction, owing to Stochastic accessing completes on R-PDCCH, therefore have substantially no effect on RN and transmit in the data of Uu interface, but the upstream data for receiving, needs are temporarily preserved in the buffer, rebuilds until the RRC of Un interface and send at Un interface again after successfully.
Step 309, RN is not received by RAR message and Stochastic accessing TRATimer expiry, then return RRC_IDLE state by step 201～207 step program in embodiment two.
The method of corresponding above-mentioned process Radio Link Failure, present invention also offers a kind of RN, including: RLF detection module and RLF processing module.Wherein, RLF detection module, for detecting Rule of judgment according to the RLF preset, detects the RLF of Un interface.RLF processing module, for when RLF detection module detects that RLF occurs Un interface, select return to RRC_IDLE state and rebuild the RRC connection of Un interface by random access operation again, or select to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC_Connected state.
RLF detection module is further used for, and receives the instruction from MAC layer from rrc layer, when instruction shows that SR transmission times reaches the maximum number of times of transmission preset, it is judged that Un interface there occurs RLF；Otherwise, it is judged that RLF does not occur Un interface.
RLF processing module selects return to RRC_IDLE state and rebuild the RRC connection of Un interface by random access operation again, specifically include following operation: discharge all Un interface radio resources, and send RRC connection release message to all UE being in RRC_Connected state of RN service, discharge all Uu interface radio resources relevant to the UE that it services, stop Uu interface wireless signal to send, close RN community；Enter RRC_IDLE state, the community that search RN is pre-configured, and select the community initiation Stochastic accessing that signal intensity meets access conditions to re-establish RRC connection.
RLF processing module selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC_Connected state, specifically include following operation: stop recovering synchronous timer, temporary suspension Un interface connects except all RB of SRB0, reset Un interface MAC entity, adopts default configuration to Un interface MAC entity and each physical channel；The community that search RN is pre-configured, selects signal intensity to meet the community of access conditions, and starts Stochastic accessing intervalometer TRA；Initiate Stochastic accessing at Un interface, send special random access preamble signal to DeNB, and control channel-monitoring RAR message at Un interface downlink；After receiving RAR message, send RRC connection reconstruction request message to DeNB according to the ULGrant carried in RAR message；If Stochastic accessing intervalometer TRATime-out without receiving the RRC connection reconstruction message from DeNB, is then interrupted process of reconstruction, is return RRC_IDLE state；If at Stochastic accessing intervalometer TRAReceive RRC connection reconstruction message before time-out, then stop Stochastic accessing intervalometer TRA, the RB recovering Un interface connects, and applies the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in described RRC connection reconstruction message, and sends RRC connection reconstruction completion message to DeNB.
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.
Claims (7)
1. the method processing Radio Link Failure, it is characterised in that the method includes:
Via node (RN) detects Rule of judgment according to the Radio Link Failure (RLF) preset, and the RLF of Un interface is detected；
When detecting that RLF occurs Un interface, described RN selects return to wireless heterogeneous networks (RRC) idle condition and rebuild the RRC connection of Un interface by random access operation again, or selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status；
Described RLF detects Rule of judgment: continuous step-out instruction or wireless spread-spectrum technology (RLC) layer instruction protocol Data Unit (PDU) reach maximum retransmission or medium education (MAC) layer instruction dispatch request (SR) reaches maximum number of times of transmission, described RN indicates SR to reach maximum number of times of transmission according to MAC layer, the RLF of Un interface is detected, particularly as follows:
Described RN receives the instruction from MAC layer from rrc layer, if it is indicated that show that SR transmission times reaches the maximum number of times of transmission preset, then judges that Un interface there occurs RLF；Otherwise, it is judged that RLF does not occur Un interface；
Described RN sends message to its all UE being in RRC_Connected state serviced；Parameter in message is the RLF of Un interface in order to indicate release cause.
2. the method processing Radio Link Failure according to claim 1, it is characterised in that described RN selects return to RRC idle condition and rebuild the RRC connection of Un interface by random access operation again, particularly as follows:
RN discharges all Un interface radio resources, and send RRC connection release message to the user terminal (UE) of all RRC of being in connection status of its service, discharge all Uu interface radio resources relevant to the UE that it services, stop Uu interface wireless signal and send, close RN community；In described RRC connection release message, instruction release cause is the RLF of Un interface；
Described RN enters RRC idle condition, searches for self pre-configured community, and selects the community initiation Stochastic accessing that signal intensity meets access conditions to re-establish RRC connection.
3. the method processing Radio Link Failure according to claim 2, it is characterized in that, the all Un interface radio resources of described release, including: reset Un interface MAC entity, release Un interface RLC and PDCP (PDCP) entity, release Un interface MAC configuration, stop the interface related intervalometer of all Un；
The all Uu interface radio resources relevant to the UE that it services of described release, including: reset Uu interface MAC entity, release Uu interface RLC and PDCP entity, stop the interface related intervalometer of all Uu.
4. the method processing Radio Link Failure according to claim 1,2, it is characterised in that described RN selects to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status, particularly as follows:
Stopping recovering synchronous timer, temporary suspension Un interface connects except all radio bearers (RB) of Signaling Radio Bearer (SRB0), reset Un interface MAC entity, and Un interface MAC entity and each physical channel are adopted default configuration；
Search for self pre-configured community, select signal intensity to meet the community of access conditions, and start Stochastic accessing intervalometer；
Initiate Stochastic accessing at Un interface, send special random access preamble signal to donor base station (DeNB), and control channel-monitoring accidental access response (RAR) message at Un interface downlink；After receiving RAR message, send according to the upstream data carried in RAR message and authorize (ULGrant) to send RRC connection reconstruction request message to DeNB；
If Stochastic accessing timer expiry and RN does not receive the RRC connection reconstruction message from DeNB, then interrupt process of reconstruction, return RRC idle condition；If receiving RRC connection reconstruction message before Stochastic accessing timer expiry, then stop Stochastic accessing intervalometer, the RB recovering Un interface connects, apply the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in described RRC connection reconstruction message, and send RRC connection reconstruction completion message to DeNB, described Un interface special parameter comprises Un interface downlink sub-frame configuration.
5. a via node RN, it is characterised in that including:
RLF detection module, for detecting Rule of judgment according to the RLF preset, detects the RLF of Un interface；
RLF processing module, for when described RLF detection module detects that RLF occurs Un interface, select return to RRC idle condition and rebuild the RRC connection of Un interface by random access operation again, or select to be connected by the RRC of RRC connection reconstruction program recovery Un interface under RRC connection status；
Described RLF detects Rule of judgment: continuous step-out instruction or rlc layer instruction PDU reach maximum retransmission or MAC layer instruction SR reaches maximum number of times of transmission,
Described RLF detection module is further used for, and receives the instruction from MAC layer from rrc layer, when instruction shows that SR transmission times reaches the maximum number of times of transmission preset, it is judged that Un interface there occurs RLF；Otherwise, it is judged that RLF does not occur Un interface；
Described RN sends message to its all UE being in RRC_Connected state serviced；Parameter in message is the RLF of Un interface in order to indicate release cause.
6. via node according to claim 5, it is characterized in that, described RLF processing module is further used for, discharge all Un interface radio resources, and send RRC connection release message to all UE being in RRC connection status of RN service, discharge all Uu interface radio resources relevant to the UE that it services, stop Uu interface wireless signal and send, close RN community；In described RRC connection release message, instruction release cause is the RLF of Un interface；Enter RRC idle condition, the community that search RN is pre-configured, and select the community initiation Stochastic accessing that signal intensity meets access conditions to re-establish RRC connection.
7. via node according to claim 6, it is characterised in that described RLF processing module is further used for, stop recovering synchronous timer, temporary suspension Un interface connects except all RB of SRB0, reset Un interface MAC entity, and Un interface MAC entity and each physical channel are adopted default configuration；The community that search RN is pre-configured, selects signal intensity to meet the community of access conditions, and starts Stochastic accessing intervalometer；
Initiate Stochastic accessing at Un interface, send special random access preamble signal to DeNB, and control channel-monitoring RAR message at Un interface downlink；After receiving RAR message, send RRC connection reconstruction request message to DeNB according to the ULGrant carried in RAR message；
If Stochastic accessing timer expiry is without receiving the RRC connection reconstruction message from DeNB, then interrupts process of reconstruction, return RRC idle condition；If receiving RRC connection reconstruction message before Stochastic accessing timer expiry, then stop Stochastic accessing intervalometer, the RB recovering Un interface connects, apply the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in described RRC connection reconstruction message, and send RRC connection reconstruction completion message to DeNB, described Un interface special parameter comprises Un interface downlink sub-frame configuration.
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