CN102223658A - Method and relay node for handling radio link failure - Google Patents
Method and relay node for handling radio link failure Download PDFInfo
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- CN102223658A CN102223658A CN2010101508836A CN201010150883A CN102223658A CN 102223658 A CN102223658 A CN 102223658A CN 2010101508836 A CN2010101508836 A CN 2010101508836A CN 201010150883 A CN201010150883 A CN 201010150883A CN 102223658 A CN102223658 A CN 102223658A
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Abstract
The invention discloses a method for handling radio link failure, comprising the following steps that: a relay node (RN) detects RLF (radio link failure) of an Un interface according to a preset RLF detection judging condition; the RN chooses to return back to a radio resource control (RRC) idle state when detecting that the UN interface has RLF, and rebuilds a RRC connection of the Un interface performing a random access operation again, or chooses to recover the RRC connection of the Un interface through a RRC connection rebuilding program under a RRC connection state. The invention further discloses a relay node. With the method and the relay node provided by the invention, effective detection on the RLF of the Un interface by the RN is implemented, and the RLF is handled well.
Description
Technical field
The present invention relates to the relaying technique of wireless communication field, relate in particular to a kind of method and via node of handling Radio Link Failure.
Background technology
In cordless communication network, landform or environment reason some areas arranged owing to can't be carried out the wired backbone network connection of ordinary base station, perhaps some are covered dead angles or hot zones has provisional wireless coverage demand, but it is higher to set up the base station equipment cost of wired connection.For these wireless coverage demands, usually can adopt wireless relay (Relay) equipment to solve, as shown in Figure 1, Relay equipment is connected by wireless signal with the existing network base station, and provide service to the UE in self coverage, thereby the realization coverage extension reduces covering the dead angle, shifts purposes such as hot zones load.
Wireless relay is one of technology of being supported of senior Long Term Evolution (LTE-A, Long Term Evolution-Advanced).In the LTE-A system, the base station of carrying out wireless connections with via node (RN, Relay Node) is called donor base station (DeNB, Donor eNB), Radio Link between DeNB and the RN is called back haul link (backhaul link), and its air interface is called the Un interface.Radio Link between RN and the UE is called access link (access link), and its air interface is called the Uu interface.RN then serves as a UE role for the role that the UE of its service serves as an eNB for its DeNB.Downlink data arrives DeNB earlier, and then passes to RN, and RN transfers to UE again; Otherwise it is then up.
The LTE-A system mainly uses " first kind wireless relay " (Type 1 Relay), and so-called first kind wireless relay is meant the wireless relay nodes that possesses following technical characterictic:
1, for the UE under the via node service, the formed new sub-district of via node is an individual cell, is different from the DeNB sub-district;
2, there is independently physical area identification (PCI, Physical Cell ID) the Relay sub-district, and physical signallings such as the synchronizing signal of broadcasting oneself in the sub-district and reference signal;
3, the UE under the via node service directly receives up-downgoing scheduling and feedback information from via node, also directly sends ascending control information to via node;
4, concerning the UE of LTE version 8 (Rel 8), the eNB sub-district of Relay sub-district and common Rel 8 is as broad as long.
For access link, its air interface should be followed LTE Rel 8 standards.Via node might use the frequency identical with back haul link at access link, and this via node is called via node (In-bandRelay Node) in the band; Perhaps via node uses the frequency different with back haul link at access link, and this via node is called band outer via node (Out-of-band Relay Node).If access link uses identical frequency with back haul link, then via node can not send downlink data at Un interface downlink data receiving and at the Uu interface simultaneously, perhaps sends upstream data and receives upstream data at the Uu interface at the Un interface simultaneously.For this reason, the data transmit-receive of Un interface and Uu interface should take the mode of timesharing to carry out, and as RN during at Un interface downlink data receiving, then stops at the Uu interface and sends downlink data to UE; Same, when RN when the Uu interface receives upstream data, then stop at the Un interface and send upstream data.Prior art can be passed through at Uu interface configuration multi-media broadcasting service Single Frequency Network (MBSFN, Multi-media Broadcast multicastservice Single Frequency Network) subframe is to inform UE downlink data receiving not in these subframe time corresponding, correspondingly, RN can be at Un mouth downlink data receiving in MBSFN subframe time corresponding.But, UE still need be in 2 symbol times of MBSFN subframe downlink data receiving, in order to avoid miss paging and system message update.
RN works in the mode that is similar to common UE at the Un interface, and the protocol stack structure that defines among its chain of command and user plane protocol stack architecture and the LTE Rel-8 is identical.RN sets up Radio Resource control (RRC at the Un interface, Radio Resource Control) ways of connecting is also similar with common UE, RN sets up the RRC connection by initiate to insert (Random Access) process at random under RRC free time (RRC_IDLE) state, enters RRC and connects (RRC_Connected) state.The RN that enters the RRC_Connected state can begin to provide for the UE under its service the backhaul relay services of data.
Because the Un interface is a wave point, its channel quality may be because decline appears in a variety of causes, may cause the error rate too high and can't continue to provide data transport service when serious, this situation is called Radio Link Failure (RLF, Radio Link Failure).
According to present LTE Rel-8 agreement, UE judges by following condition whether air interface RLF takes place:
If 1 receives preset value N step-out (out-of-sync) indication from physical layer continuously, and do not receive preset value M recovery (in-sync) indication synchronously from physical layer continuously before timer T is overtime, then UE thinks RLF has taken place;
If 2 receive the indication of access failure at random from medium access control (MAC, Medium Access Control) layer, also be that continuous random inserts that number of times has reached maximum and still not success, then UE thinks RLF has taken place;
If 3 receive from the indication of Radio Link control (RLC, Radio Link Control) layer, there has been rlc protocol data cell (PDU, Protocol Data Unit) to reach maximum retransmission, then UE thinks RLF has taken place.
When UE detects generation RLF,, then return to the RRC_IDLE state from the RRC_Connected state if Access Layer (AS, Access Stratum) security mechanism is activated; When UE detected generation RLF, if the AS security mechanism is not activated, then UE started radio resource control connection reestablishment (re-establishment) program, attempted to recover again normal RRC and connected.
For RN, need keep RRC to be connected at the Un interface with DeNB as the role of a UE, and need keep RRC to connect with a plurality of UE of its service as the role of an eNB at the Uu interface.When RLF takes place in the Un mouth, RN judges for the detection of RLF and corresponding processing method all is different from common UE, yet, the RLF that prior art also can't provide a kind of RN of making can effectively detect the Un interface, and the method for suitable processing takes place at the Un interface to make under the situation of RLF.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and via node of handling Radio Link Failure, with the effective detection of realization RN to Un interface RLF, and the processing behind the generation RLF.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method of handling Radio Link Failure, this method comprises:
Via node (RN) detects Rule of judgment according to default Radio Link Failure (RLF), and the RLF of Un interface is detected;
When detecting Un interface generation RLF, described RN selection returns to Radio Resource and controls (RRC) idle condition and pass through the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects.
Described RLF detects Rule of judgment: continuous step-out indication or Radio Link control (RLC) layer indication protocol Data Unit (PDU) reach maximum retransmission or medium access control (MAC) layer indication dispatch request (SR) reaches maximum number of times of transmission.
Described RN reaches maximum number of times of transmission according to MAC layer indication SR, and the RLF of Un interface is detected, and is specially:
Described RN if indication shows that SR sends number of times and reached default maximum number of times of transmission, judges then that RLF has taken place the Un interface from the indication of rrc layer reception from the MAC layer; Otherwise, judge that RLF does not take place the Un interface.
Described RN selects to return to the RRC idle condition and by the RRC connection of access operation reconstruction Un interface at random again, is specially:
RN discharges all Un interface wireless resources, and send the RRC connection release message to the user terminal (UE) that all of its service are in the RRC connection status, discharge all Uu interface wireless resources relevant, stop Uu interface wireless signal and send, close the RN sub-district with the UE of its service; The indication release cause is the RLF of Un interface in the described RRC connection release message;
Described RN enters the RRC idle condition, searches for self pre-configured sub-district, and the sub-district of selecting signal strength signal intensity to satisfy access conditions is initiated to insert at random and rebulid RRC and connect.
All Un interface wireless resources of described release comprise: the Un interface MAC entity that resets, release Un interface RLC and PDCP (PDCP) entity, release Un interface MAC dispose, stop the interface related timer of all Un;
All Uu interface wireless resources relevant with the UE of its service of described release comprise: the Uu interface MAC entity that resets, discharge Uu interface RLC and PDCP entity, stop the interface related timer of all Uu.
Described RN is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects, and is specially:
Stop to recover synchro timer, all radio bearers (RB) that temporary suspension Un interface removes Signaling Radio Bearer (SRB0) connect, and the Un interface MAC entity that resets adopts default configuration to Un interface MAC entity and each physical channel;
Search for self pre-configured sub-district, the sub-district of selecting signal strength signal intensity to satisfy access conditions, and startup inserts timer at random;
Initiate to insert at random at the Un interface, (DeNB) sends special-purpose arbitrary access front signal to donor base station, and monitors accidental access response (RAR) message at Un interface down control channel; After receiving RAR message, send mandate (UL Grant) according to the upstream data that carries in the RAR message and send RRC connection reconstruction request message to DeNB;
RN does not receive the RRC connection reconstruction message from DeNB if insert timer expiry at random, then interrupts process of reconstruction, returns the RRC idle condition; If before inserting timer expiry at random, receive RRC connection reconstruction message, then stop to insert at random timer, the RB that recovers the Un interface connects, use the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in the described RRC connection reconstruction message, and send the RRC connection reconstruction to DeNB and finish message, comprise the configuration of Un interface descending sub frame in the described Un interface special parameter.
The present invention also provides a kind of via node, comprising:
The RLF detection module is used for detecting Rule of judgment according to default RLF, and the RLF of Un interface is detected;
The RLF processing module, be used for when described RLF detection module detects Un interface generation RLF, selection returns to the RRC idle condition and by the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects.
Described RLF detects Rule of judgment: continuous step-out indication or rlc layer indication PDU reach maximum retransmission or MAC layer indication SR reaches maximum number of times of transmission.
Described RLF detection module is further used for, and receives indication from the MAC layer from rrc layer, when indication shows that SR sends number of times and reached default maximum number of times of transmission, judges that RLF has taken place the Un interface; Otherwise, judge that RLF does not take place the Un interface.
Described RLF processing module is further used for, discharge all Un interface wireless resources, and send the RRC connection release message to the UE that all of RN service are in the RRC connection status, discharge all Uu interface wireless resources relevant with the UE of its service, stop Uu interface wireless signal and send, close the RN sub-district; The indication release cause is the RLF of Un interface in described RRC connection release message; Enter the RRC idle condition, search RN pre-configured sub-district, and the sub-district of selecting signal strength signal intensity to satisfy access conditions is initiated to insert at random and is rebulid RRC and connect.
Described RLF processing module is further used for, and stops to recover synchro timer, and all RB that temporary suspension Un interface removes SRB0 connect, and the Un interface MAC entity that resets adopts default configuration to Un interface MAC entity and each physical channel; The pre-configured sub-district of search RN, the sub-district of selecting signal strength signal intensity to satisfy access conditions, and startup inserts timer at random;
Initiate to insert at random at the Un interface, send special-purpose arbitrary access front signal, and monitor RAR message at Un interface down control channel to DeNB; After receiving RAR message, send RRC connection reconstruction request message to DeNB according to the UL Grant that carries in the RAR message;
Do not receive RRC connection reconstruction message if insert timer expiry at random, then interrupt process of reconstruction, return the RRC idle condition from DeNB; If before inserting timer expiry at random, receive RRC connection reconstruction message, then stop to insert at random timer, the RB that recovers the Un interface connects, use the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in the described RRC connection reconstruction message, and send the RRC connection reconstruction to DeNB and finish message, comprise the configuration of Un interface descending sub frame in the described Un interface special parameter.
A kind of method and via node of handling Radio Link Failure provided by the present invention detects Rule of judgment by RN according to default RLF, and the RLF of Un interface is detected; When detecting Un interface generation RLF, the RN selection returns to the RRC idle condition and by the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects.
The new Un mouth Radio Link Failure that the present invention proposes detects Rule of judgment, and promptly SR reaches maximum number of times of transmission, can further increase the reliability that RN detects for Un mouth Radio Link Failure; The present invention has proposed the processing method of RN for Un mouth Radio Link Failure simultaneously, has increased the processing procedure of RN at the Uu interface especially on the Radio Link Failure processing method basis of existing UE.By the present invention, realized the effective detection of RN, and the processing behind the RLF has taken place Un interface RLF.
Description of drawings
Fig. 1 is for comprising the schematic diagram of the wireless network architecture of wireless relay in the prior art;
Handle the method flow diagram of Radio Link Failure in Fig. 2 embodiment of the invention one;
Handle the method flow diagram of Radio Link Failure in Fig. 3 embodiment of the invention two.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
A kind of method of handling Radio Link Failure provided by the invention, its core concept is: RN detects Rule of judgment according to default RLF, and the RLF of Un interface is detected; When detecting Un interface generation RLF, the RN selection returns to the RRC_IDLE state and by the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC_Connected state and connects.
Wherein, RLF detection Rule of judgment is: continuous step-out indication or rlc layer indicate PDU to reach maximum retransmission or the MAC layer indicates dispatch request (SR, Scheduling Request) to reach maximum number of times of transmission.
RN reaches maximum number of times of transmission according to MAC layer indication SR, RLF to the Un interface detects, be specially: RN if indication shows that SR sends number of times and reached default maximum number of times of transmission, judges then that RLF has taken place the Un interface from the indication of rrc layer reception from the MAC layer; Otherwise, judge that RLF does not take place the Un interface.The SR maximum number of times of transmission is passed through the RRC parameter configuration by DeNB.
RN is according to step-out indication continuously, RLF state to the Un interface detects, be specially: if receive preset value N the step-out indication from physical layer continuously, and do not receive continuously that before timer T is overtime preset value M is indicated synchronously from the recovery of physical layer, then RN thinks RLF has taken place.
RN is according to rlc layer PDU maximum retransmission, and the RLF state of Un interface is detected, and is specially: if receive indication from rlc layer, had rlc layer PDU to reach maximum retransmission, then RN thinks RLF has taken place.
In addition, RN selects to return to the RRC_IDLE state and passes through the RRC connection of access operation reconstruction Un interface at random again, comprise that specifically following operation: RN discharges all Un interface wireless resources, and send RRC to the UE that all of its service are in the RRC_Connected state and connect and discharge (RRCConnection Release) message, discharge all Uu interface wireless resources relevant with the UE of its service, stop Uu interface wireless signal and send, close the RN sub-district; Subsequently, RN enters the RRC_IDLE state, searches for self pre-configured sub-district, and the sub-district of selecting signal strength signal intensity to satisfy access conditions is initiated to insert at random and rebulid RRC and connect.
Wherein, the operation that discharges all Un interface wireless resources comprises: the Un interface MAC entity that resets, release Un interface RLC and PDCP (PDCP, Packet Data ConvergenceProtocol) entity, release Un interface MAC dispose, stop the interface related timer of all Un.The operation that discharges all Uu interface wireless resources relevant with the UE of its service comprises: the Uu interface MAC entity that resets, discharge Uu interface RLC and PDCP entity, stop the interface related timer of all Uu.Need to prove that the priority requirement on the operation of release Un interface wireless resource has no time with the operation that discharges Uu interface wireless resource also can be carried out certainly simultaneously.
RN is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC_Connected state and connects, and specifically comprises following operation: started if recover synchro timer, then stopped recovering synchro timer; All radio bearers (RB, Radio Bearer) that temporary suspension Un interface removes Signaling Radio Bearer (SRB0, Signaling Radio Bearer) connect, and the Un interface MAC entity that resets adopts default configuration to Un interface MAC entity and each physical channel; Search for self pre-configured sub-district, the sub-district of selecting signal strength signal intensity to satisfy access conditions, and startup inserts timer T at random
RAInitiate to insert at random at the Un interface, send special-purpose random access guiding (RA preamble) signal, and monitor accidental access response (RAR, RA Response) message at Un interface down control channel to DeNB; After receiving RAR message, send mandate (UL Grant) according to the upstream data that carries in the RAR message and send RRC connection reconstruction request (RRC Connection Reestablishment Request) message to DeNB; If insert timer T at random
RAOvertime and RN does not receive RRC connection reconstruction (RRC ConnectionReestablishment) message from DeNB, then interrupt process of reconstruction, return the RRC_IDLE state; If inserting timer T at random
RAReceive RRC Connection Reestablishment message before overtime, then stop to insert at random timer T
RAThe RB that recovers the Un interface connects, use new radio-resource-configuration, security parameter and the Un interface special parameter (as the configuration of Un interface descending sub frame) that carry in the RRC Connection Reestablishment message, and finish (RRC ConnectionReestablishment Complete) message to DeNB transmission RRC connection reconstruction.
Further elaborate below in conjunction with the method for specific embodiment above-mentioned processing Radio Link Failure.
In embodiments of the invention one, suppose that DeNB is the SR maximum number of times of transmission dsr-TransMax=4 of RN configuration.RN has upstream data to be sent at the Un interface, and has triggered SR at the MAC layer, and the SR counter is initially 0.Disposing the Transmission Time Interval (TTI of SR resource, TransmissionTime Interval), the MAC layer indication physical layer of RN is gone control channel (PUCCH, Physical Uplink Control Channel) physically upward to DeNB transmission SR, and the SR counter adds 1 simultaneously.If never receive the ascending resource mandate from DeNB, RN will continue support physical layer to send SR to DeNB on PUCCH at the TTI that the next one can send SR, and the SR counter adds 1 simultaneously.So repeat to send SR, equal 4 up to the SR counter.
When the SR counter equals 4, the Un side MAC layer of RN will reach the SR maximum number of times of transmission to the rrc layer indication, and RRC judges that in view of the above RLF has taken place the Un mouth, starts the RLF handling process immediately.
In embodiments of the invention two, RN selects to return to the RRC_IDLE state and by the RRC connection of access operation reconstruction Un interface at random again, as shown in Figure 2, specifically may further comprise the steps:
Need to prove, not free requirement successively between step 205 and step 202～204, step 205 can be carried out before each step of step 202～204 or carry out simultaneously.
Step 207 if satisfy access conditions, is then initiated access at random in this pre-configured sub-district and is rebulid the RRC connection; If do not satisfy access conditions, then RRC connection reconstruction failure.
In embodiments of the invention three, RN is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC_Connected state and connects, and as shown in Figure 3, specifically may further comprise the steps:
Step 302 stops to recover synchro timer.
All RB that step 303, temporary suspension Un interface are removed SRB0 connect, and the MAC entity of the Un interface that resets is to MAC entity and each physical channel employing default configuration of Un interface.
Step 304 is searched for pre-configured cell signal, judges whether its signal strength signal intensity satisfies access conditions.
Step 305 when signal strength signal intensity satisfies access conditions, starts and inserts timer TRA at random.
If RN receives RAR message, then carry out the operation of subsequent step 307～308; If RN does not receive RAR message, then carry out the operation of subsequent step 309.
So far the RRC connection reconstruction of Un interface is finished, and RN can recover the transfer of data at the Un interface.
In above-mentioned process of reconstruction, finish on R-PDCCH owing to insert at random, therefore do not influence the transfer of data of RN substantially at the Uu interface, but for the upstream data that receives, to need temporarily in buffering area, to preserve, send at the Un interface again after the RRC that treats the Un interface rebuilds successfully.
The method of corresponding above-mentioned processing Radio Link Failure, the present invention also provides a kind of RN, comprising: RLF detection module and RLF processing module.Wherein, the RLF detection module is used for detecting Rule of judgment according to default RLF, and the RLF of Un interface is detected.The RLF processing module, be used for when the RLF detection module detects Un interface generation RLF, selection returns to the RRC_IDLE state and by the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC_Connected state and connects.
The RLF detection module is further used for, and receives indication from the MAC layer from rrc layer, when indication shows that SR sends number of times and reached default maximum number of times of transmission, judges that RLF has taken place the Un interface; Otherwise, judge that RLF does not take place the Un interface.
The RLF processing module is selected to return to the RRC_IDLE state and is passed through the RRC connection of access operation reconstruction Un interface at random again, specifically comprise following operation: discharge all Un interface wireless resources, and send the RRC connection release message to the UE that all of RN service are in the RRC_Connected state, discharge all Uu interface wireless resources relevant with the UE of its service, stop Uu interface wireless signal and send, close the RN sub-district; Enter the RRC_IDLE state, search RN pre-configured sub-district, and the sub-district of selecting signal strength signal intensity to satisfy access conditions is initiated to insert at random and is rebulid RRC and connect.
The RLF processing module is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC_Connected state and connects, specifically comprise following operation: stop to recover synchro timer, all RB that temporary suspension Un interface removes SRB0 connect, the Un interface MAC entity that resets adopts default configuration to Un interface MAC entity and each physical channel; The pre-configured sub-district of search RN, the sub-district of selecting signal strength signal intensity to satisfy access conditions, and startup inserts timer T at random
RAInitiate to insert at random at the Un interface, send special-purpose arbitrary access front signal, and monitor RAR message at Un interface down control channel to DeNB; After receiving RAR message, send RRC connection reconstruction request message to DeNB according to the UL Grant that carries in the RAR message; If insert timer T at random
RAOvertime and do not receive RRC connection reconstruction message from DeNB, then interrupt process of reconstruction, return the RRC_IDLE state; If inserting timer T at random
RAReceive RRC connection reconstruction message before overtime, then stop to insert at random timer T
RA, the RB that recovers the Un interface connects, and uses the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in the described RRC connection reconstruction message, and finishes message to DeNB transmission RRC connection reconstruction.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (11)
1. a method of handling Radio Link Failure is characterized in that, this method comprises:
Via node (RN) detects Rule of judgment according to default Radio Link Failure (RLF), and the RLF of Un interface is detected;
When detecting Un interface generation RLF, described RN selection returns to Radio Resource and controls (RRC) idle condition and pass through the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects.
2. according to the method for the described processing Radio Link Failure of claim 1, it is characterized in that described RLF detects Rule of judgment and is: continuous step-out indication or Radio Link control (RLC) layer indication protocol Data Unit (PDU) reach maximum retransmission or medium access control (MAC) layer indication dispatch request (SR) reaches maximum number of times of transmission.
3. according to the method for the described processing Radio Link Failure of claim 2, it is characterized in that described RN reaches maximum number of times of transmission according to MAC layer indication SR, the RLF of Un interface detected, be specially:
Described RN if indication shows that SR sends number of times and reached default maximum number of times of transmission, judges then that RLF has taken place the Un interface from the indication of rrc layer reception from the MAC layer; Otherwise, judge that RLF does not take place the Un interface.
4. according to the method for claim 1,2 or 3 described processing Radio Link Failure, it is characterized in that described RN selects to return to the RRC idle condition and by the RRC connection of access operation reconstruction Un interface at random again, is specially:
RN discharges all Un interface wireless resources, and send the RRC connection release message to the user terminal (UE) that all of its service are in the RRC connection status, discharge all Uu interface wireless resources relevant, stop Uu interface wireless signal and send, close the RN sub-district with the UE of its service; The indication release cause is the RLF of Un interface in the described RRC connection release message;
Described RN enters the RRC idle condition, searches for self pre-configured sub-district, and the sub-district of selecting signal strength signal intensity to satisfy access conditions is initiated to insert at random and rebulid RRC and connect.
5. according to the method for the described processing Radio Link Failure of claim 4, it is characterized in that, all Un interface wireless resources of described release comprise: the Un interface MAC entity that resets, release Un interface RLC and PDCP (PDCP) entity, release Un interface MAC dispose, stop the interface related timer of all Un;
All Uu interface wireless resources relevant with the UE of its service of described release comprise: the Uu interface MAC entity that resets, discharge Uu interface RLC and PDCP entity, stop the interface related timer of all Uu.
6. according to the method for claim 1,2 or 3 described processing Radio Link Failure, it is characterized in that described RN is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects, and is specially:
Stop to recover synchro timer, all radio bearers (RB) that temporary suspension Un interface removes Signaling Radio Bearer (SRB0) connect, and the Un interface MAC entity that resets adopts default configuration to Un interface MAC entity and each physical channel;
Search for self pre-configured sub-district, the sub-district of selecting signal strength signal intensity to satisfy access conditions, and startup inserts timer at random;
Initiate to insert at random at the Un interface, (DeNB) sends special-purpose arbitrary access front signal to donor base station, and monitors accidental access response (RAR) message at Un interface down control channel; After receiving RAR message, send mandate (UL Grant) according to the upstream data that carries in the RAR message and send RRC connection reconstruction request message to DeNB;
RN does not receive the RRC connection reconstruction message from DeNB if insert timer expiry at random, then interrupts process of reconstruction, returns the RRC idle condition; If before inserting timer expiry at random, receive RRC connection reconstruction message, then stop to insert at random timer, the RB that recovers the Un interface connects, use the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in the described RRC connection reconstruction message, and send the RRC connection reconstruction to DeNB and finish message, comprise the configuration of Un interface descending sub frame in the described Un interface special parameter.
7. a via node is characterized in that, comprising:
The RLF detection module is used for detecting Rule of judgment according to default RLF, and the RLF of Un interface is detected;
The RLF processing module, be used for when described RLF detection module detects Un interface generation RLF, selection returns to the RRC idle condition and by the RRC connection of access operation reconstruction Un interface at random again, perhaps is chosen in the RRC that passes through RRC connection reconstruction program recovery Un interface under the RRC connection status and connects.
8. according to the described via node of claim 7, it is characterized in that described RLF detects Rule of judgment and is: continuous step-out indication or rlc layer indication PDU reach maximum retransmission or MAC layer indication SR reaches maximum number of times of transmission.
9. described according to Claim 8 via node, it is characterized in that described RLF detection module is further used for, from the indication of rrc layer reception from the MAC layer, when indication shows that SR sends number of times and reached default maximum number of times of transmission, judge that RLF has taken place the Un interface; Otherwise, judge that RLF does not take place the Un interface.
10. according to claim 7,8 or 9 described via nodes, it is characterized in that, described RLF processing module is further used for, discharge all Un interface wireless resources, and send the RRC connection release message to the UE that all of RN service are in the RRC connection status, discharge all Uu interface wireless resources relevant, stop Uu interface wireless signal and send, close the RN sub-district with the UE of its service; The indication release cause is the RLF of Un interface in described RRC connection release message; Enter the RRC idle condition, search RN pre-configured sub-district, and the sub-district of selecting signal strength signal intensity to satisfy access conditions is initiated to insert at random and is rebulid RRC and connect.
11. according to claim 7,8 or 9 described via nodes, it is characterized in that, described RLF processing module is further used for, stop to recover synchro timer, all RB that temporary suspension Un interface removes SRB0 connect, the Un interface MAC entity that resets adopts default configuration to Un interface MAC entity and each physical channel; The pre-configured sub-district of search RN, the sub-district of selecting signal strength signal intensity to satisfy access conditions, and startup inserts timer at random;
Initiate to insert at random at the Un interface, send special-purpose arbitrary access front signal, and monitor RAR message at Un interface down control channel to DeNB; After receiving RAR message, send RRC connection reconstruction request message to DeNB according to the UL Grant that carries in the RAR message;
Do not receive RRC connection reconstruction message if insert timer expiry at random, then interrupt process of reconstruction, return the RRC idle condition from DeNB; If before inserting timer expiry at random, receive RRC connection reconstruction message, then stop to insert at random timer, the RB that recovers the Un interface connects, use the new radio-resource-configuration, security parameter and the Un interface special parameter that carry in the described RRC connection reconstruction message, and send the RRC connection reconstruction to DeNB and finish message, comprise the configuration of Un interface descending sub frame in the described Un interface special parameter.
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| CN201010150883.6A CN102223658B (en) | 2010-04-19 | 2010-04-19 | A kind of method processing Radio Link Failure and via node |
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