CN101998700B - Status information acquiring method and system for base station participating in relaying in relay network - Google Patents

Abstract

The invention provides status information acquiring method and system for a base station participating in relaying in a relay network. The method comprises the step that: a relay node feeds back self status information or the status information of user equipment (User Equipment) within the self coverage range to the base station participating in the relaying. The base station (DeNB, Donor eNB) participating in the relaying acquires the status information of the RN side and the UE side of a Uu interface through the status information of the relay node (RN), fed back on the Un interface, thereby flexibly scheduling the UE or the E-RAB (E-Radio Access Bearer) of the UE and ensuring that each UE or the E-RAB of the UE can reasonably receive data sent by the DeNB, or the status of the RN or the E-RAB of the RN is controlled, and the overload condition is avoided happening on the RN through flow control.

Description

The base station participating in relaying in junction network obtains the method and system of state information

Technical field

The present invention relates to relaying technique, the base station participating in relaying in espespecially a kind of junction network obtains the method and system of state information.

Background technology

Fig. 1 is the composition structural representation of existing cellular radio Communication system, and as shown in Figure 1, cellular radio Communication system forms primarily of terminal, wireless access network (RAN, Radio Access Network) and core net.RAN is by base station, or the network of base station and base station controller (not shown in figure 1) composition, is responsible for Access Layer affairs, the management of such as Radio Resource.Physics or connection in logic can be there is according to actual conditions between base station, as the base station 1 in Fig. 1 and base station 2, or base station 1 and base station 3.Each base station can connect with one or more than one core net node (CN, Core Network).Core net is responsible for Non-Access Stratum affairs, such as location updating etc., and is the anchor point in user face.User terminal (UE, UserEquipment) refers to the various equipment that can communicate with cellular radio communication network, such as mobile phone or notebook computer etc.

Fig. 2 is the schematic diagram of the network architecture of existing LTE, as shown in Figure 2, at Long Term Evolution (LTE, Long Term Evolution) in system, on the one hand, the wireless coverage of fixed base stations network is restricted due to various reason, and such as various building structure causes inevasible existence in the covering of wireless network to cover leak to reasons such as the stops of wireless signal; On the other hand, in the border district of community, due to weakening of wireless signal strength, and the interference of neighbor cell, cause UE when cell edge, communication quality is poor, and the error rate of wireless transmission improves.In order to improve data transmission throughput, group mobility, casual network is disposed, the throughput in cell edge area and the covering of new region, a solution introduces a kind of wireless network node at cellular radio Communication system, is called relaying (Relay).

Relay has the website by wireless link relay data and possibility control information function between other network node, also via node/relay station (Relay Node/Relay Station) is, Fig. 3 is the schematic diagram of the network architecture adding relay station in existing LTE, as shown in Figure 3, the UE that wherein base station is directly served is called grand UE (Macro UE), and the UE of Relay service is called relaying UE (Relay UE).

As shown in Figure 3, the interface between each network element and link definition as follows:

Wireless link between base station and UE is called the link that direct transfers (direct link), comprises uplink/downlink (DL/ULdownlink/uplink) and to direct transfer link.Wireless link between Relay Nod e and UE is called access link (access link), comprises DL/UL access link.Wireless link between base station and Relay Node is called back haul link (backhaul link), comprises DL/UL repeated link.

Relay Node can by multiple method relay data, such as directly amplify the base station received and send wireless signal, or corresponding process will be carried out as after demodulation or decoding after the data receiver that sends of base station, then be transmitted to UE, or base station and relaying cooperation send data to UE; Contrary Relay Node also can the data that send to base station from UE of relaying.

In numerous trunk types, have a kind of relaying to be called type i relaying (Type I Relay), the feature of type i relaying is as follows:

UE cannot distinguish the community under Relay and fixed base stations, and namely as broad as long with the community under base station from the community under UE, Relay Node, this type of community can be called Relay community.The Relay community physical cell identity (PCI that have oneself the same as all communities, Physical Cell Identity), equally with normal cells send broadcast, when UE resides in Relay community, Relay community can use to UE by allocation schedule Radio Resource separately, separate with the wireless resource scheduling of the base station (base station also referred to as Donor base station and Relay are connected by backhaul link) participating in relaying.Identical with between ordinary base station community and UE of interface between Relay community and Relay UE and protocol stack.

Meanwhile, in type i relay system, define several node: the wave point between UE, Relay Node, Donor eNB and these nodes, the Uu interface such as between UE and Relay Node; Un interface between Re layNode and Donor eNB.

There is many discussion methods in the data for the how relaying UE of the interface between Relay Node and Donor eNB.Protocol stack for Relay Node and Donor eNB is divided into two kinds of large classes at present: the first kind ends at Relay Node (scheme as shown in Fig. 4 ~ Fig. 6 below) for S1 interface, and Equations of The Second Kind ends at Donor eNB (scheme as shown in Fig. 7 below) for S1 interface.Below in conjunction with schematic diagram, these four kinds of schemes are described.

Fig. 4 is the schematic diagram of the chain of command protocol stack implementation one between existing Relay and Donor eNB, and as shown in Figure 4, Relay is completely transparent to DeNB; In Relay, increase S1-AP agreement, Relay is directly connected with MME, and between DeNB and MME, adds Relay PGW/SGW network element, reduce the protocol modification to DeNB, but add network delay to a certain extent.

Fig. 5 is the schematic diagram of the chain of command protocol stack implementation two between existing Relay and Donor eNB, and as shown in Figure 5, with a S1AP agency on Donor eNB, it is all transparent that S1 AP acts on behalf of for MME and Relay.Seem directly connect Donor eNB's from MME, UE; And from Relay, Relay similarly be directly and MME talk with.

Fig. 6 is the schematic diagram of the chain of command protocol stack implementation three between existing Relay and Donor eNB, as shown in Figure 6, the program is actual is the special case of scheme one shown in Fig. 4, function by DeNB and the Relay PGW/SGW shown in Fig. 4 concentrates in DeNB, has made some amendments to the agreement of DeNB.

Fig. 7 is the schematic diagram of the chain of command protocol stack implementation four between existing Relay and Donor eNB, and as shown in Figure 7, the program without S1-AP agreement, is namely completed the function of S1-AP agreement in Relay side by RRC.

Shown in above-mentioned Fig. 4 ~ Fig. 7 four kind of a chain of command protocol stack scheme finally can be summarized as two kinds, and one is that UE is visible to DeNB.Another is that UE is invisible to DeNB.Scheme shown in Fig. 5 and Fig. 7 be UE to the visible situation of DeNB, the scheme shown in Fig. 4 and Fig. 6 is that UE is to the sightless situation of DeNB.

In LTE protocol, because for up, eNB can control uplink transmission data amount by distributing uplink grant (ULgrant), same for descending, eNB can adjust downlink transmission data quantity according to the buffer size (buffer size) of radio link layer (RLC, Radio Link Control) status report and UE.So bottom does not have special flow control (flow control) mechanism.

After LTE system introduces Relay, Relay node both sides are that Un interface and two, Uu interface are independently eated dishes without rice or wine respectively.DeNB can know the buffering area situation of RN by Un interface, but DeNB cannot know that the concrete condition of UE on Uu interface is as various state information.In this case, if in RN and multiple UE communication process, the RN side of Uu interface occur congested, and DeNB is ignorant to this, rationally cannot carry out flow control, DeNB can continue to send downlink data, RN place finally can be caused to transship (overload), thus cause loss of data.

Meanwhile, because multiple UE enhancing RAB (E-RAB, E-Radio Access bearer) is multiplexing on a RN E-RAB, as shown in Figure 8, Fig. 8 is the schematic diagram of one of existing UE E-RAB multiplexing RN E-RAB mode.Current DeNB carries out the management of extensive style on Un interface to RN, so DeNB does not understand the concrete condition of the E-RAB of each UE or UE in RN coverage as state information.If there is the situation that the UE radio condition now of very high its correspondence of business of priority is very poor, business higher for priority still can preferentially issue by DeNB, like this, DeNB rationally cannot carry out flow control, the inefficiency of Un interface will inevitably be caused, or have influence on the transmission of multiplexing other UE on same RN E-RAB or other business, congested or packet loss even occurs.

Summary of the invention

In view of this, main purpose of the present invention is to provide the base station participating in relaying in a kind of junction network to obtain the method for state information, can know the state information of RN side or UE side on Uu interface, ensures that DeNB rationally carries out flow control or scheduling.

Another object of the present invention is to provide the base station participating in relaying in a kind of junction network to obtain the system of state information, the state information on RN side on Uu interface or UE side can be known, ensure that DeNB rationally carries out flow control or scheduling.

For achieving the above object, technical scheme of the present invention is achieved in that

The base station participating in relaying in junction network obtains a method for state information, and the method comprises:

Via node is to the state information of the user terminal UE in base station feedback self or self coverage participating in relaying.

The method also comprises: flow control or scheduling, according to the state information obtained, Un interface are carried out in the base station of described participation relaying.

Described via node feeds back described state information with cycle triggering mode or event triggered fashion.

When with the cycle, triggering mode feeds back described state information, comprising:

The base station of described participation relaying issues status report configuration messages by radio resource control RRC signaling to described via node, notifies described via node feedback cycle length;

After described via node receives status report configuration messages, starting state report timer, and when status report timer time-out, the base station to described participation relaying sends the status report messages carrying described state information;

The timing length of described status report timer is feedback cycle length.

When feeding back described state information with event triggered fashion, comprising:

Described via node increases a status report MAC and controls cell, and in Logic Channel Identifier LCID value list reserved in MAC head, distribution LCID index controls cell to newly-increased status report MAC;

When the value of this LCID is 0, show not need to send described status report messages, when the value of this LCID is 1, show to need to send described status report messages;

If meet trigger condition, then the value of LCID is 1, triggers described via node and sends the status report messages carrying described state information.

Described trigger condition is what pre-set, or gives described via node by the base station of described participation relaying by RRC signaling.

Described via node to the granularity of feedback of the base station participating in relaying is: the enhancing RAB E-RAB on via node or via node; Or, UE or UE E-RAB.

When the granularity of described feedback is the enhancing RAB E-RAB on via node or via node, described state information is:

Comprise described via node downstream buffer district occupancy, Un eats dishes without rice or wine throughput, descending PRB resources occupation rate, and other carry out the useful information of Flow Control to the base station of described participation relaying at Un interface.

When the granularity of described feedback is UE or UE E-RAB, described state information is:

Radio condition, the buffer performance of the UE in described via node coverage, throughput of eating dishes without rice or wine; Or, the dispatching priority result of UE; Or, the dispatching priority result of multiplexing UE E-RAB on certain RN E-RAB.

The base station participating in relaying in junction network obtains a system for state information, comprises via node, the base station participating in relaying and UE, wherein,

Via node, for the state information to the UE in base station feedback self or self coverage participating in relaying.

The base station of described participation relaying, also for according to the state information obtained, Un interface carries out flow control or scheduling.

Described via node, for feeding back described state information with cycle triggering mode or event triggered fashion.

As can be seen from the technical scheme that the invention described above provides, via node is to the state information of the UE in base station feedback self or self coverage participating in relaying, flow control or scheduling, according to the state information obtained, Un interface are carried out in the base station participating in relaying.The state information that DeNB is fed back on Un mouth by RN, dispatches the E-RAB of UE or UE neatly, ensure that the data that each UE or UE E-RAB reasonably can receive DeNB and issues; Or the state of RN or RN E-RAB is controlled, is avoided the situation of (overload) of transshipping on RN by flow control.

Accompanying drawing explanation

Fig. 1 is the composition structural representation of existing cellular radio Communication system;

Fig. 2 is the schematic diagram of the network architecture of existing LTE;

Fig. 3 is the schematic diagram of the network architecture adding relay station in existing LTE;

Fig. 4 is the schematic diagram of the chain of command protocol stack implementation one between existing Relay and Donor eNB;

Fig. 5 is the schematic diagram of the chain of command protocol stack implementation two between existing Relay and Donor eNB;

Fig. 6 is the schematic diagram of the chain of command protocol stack implementation three between existing Relay and Donor eNB;

Fig. 7 is the schematic diagram of the chain of command protocol stack implementation four between existing Relay and Donor eNB;

Fig. 8 is the schematic diagram of existing UE E-RAB multiplexing RN E-RAB mode;

Fig. 9 is the flow chart of the method for the base station acquisition state information participating in relaying in junction network of the present invention;

Figure 10 is the composition structural representation of the system of the base station acquisition state information participating in relaying in junction network of the present invention.

Embodiment

Fig. 9 is the flow chart of the method for the base station acquisition state information participating in relaying in junction network of the present invention, and as shown in Figure 9, the inventive method comprises the following steps:

Step 900: via node is to the state information of the UE in base station feedback self or self coverage participating in relaying.

In this step, via node can with cycle triggering mode or event triggered fashion, by the state information of whole RN or certain RN E-RAB/RB to DeNB condition report feedback (Status Report).

Wherein, feedback granularity can be RN or RN E-RAB, and the feedback content of carrying in status report is the downstream buffer district occupancy of RN, and Un eats dishes without rice or wine throughput, the state informations such as downlink physical Resource Block (PRB, PhysicalResource Block) resources occupation rate; Feedback granularity also can be the business of UE or UE, and the feedback content of carrying in status report is the radio condition of each UE under RN coverage, buffer performance, the state informations such as throughput of eating dishes without rice or wine.Also the dispatching priority adjustment information of suggestion UE can be fed back as state information.

Cycle triggering mode is: DeNB issues Status Report by RRC signaling to RN and configures (configuration) message, the timing length of notice RN feedback cycle length and Status Report timer, after RN receives Status Report configuration messages, start Status Report timer, and when StatusReport timer expiry, send Status Report message to DeNB.Wherein, the timing length of Status Report timer can pre-set according to actual needs.

Event triggered fashion is: on RN, increase a Status Report MAC control cell (MACcontrol element), and Logic Channel Identifier (LCID reserved in MAC head, logical channelidentifier) distribute a LCID index (LCID Index) in value list and control cell as 11001 to newly-increased StatusReport MAC, table 1 is the list of LCID value in MAC head, as added shown in boldface type in table 1.When the value of this LCID is 0, show not need to send Status Report message, when the value of this LCID is 1, show to need to send Status Report message.If meet trigger condition such as certain UE to transship (overload), then the value of LCID is 1, triggers RN and sends Status Report message.Here, trigger condition can pre-set, and also can pass through RRC signaling to RN by DeNB.

Index (Index)	LCID value (LCID values)
		00000	CCCH
00001-01010	Identity of the logical channel
		01011-11000	Reserved
11001	Status Report
		11010	Power Headroom Report
11011	C-RNTI
		11100	Truncated BSR
11101	Short BSR
		11110	Long BSR
11111	Padding

Table 1

Step 901: flow control or scheduling, according to the state information obtained, Un interface are carried out in the base station participating in relaying.It should be noted that, this step it is emphasised that: participate in relaying base station according to feedback state information, Un interface carries out flow control or scheduling, dispatches the E-RAB of UE or UE neatly, ensure that the data that each UE or UE E-RAB reasonably can receive DeNB and issues; Or the state of RN or RN E-RAB is controlled, is avoided the situation occurring to transship on RN by flow control.Concrete flow control or dispatching method are that each producer realizes, and are not intended to limit the scope of the invention.

For the method shown in Fig. 9, the present invention also provides the base station participating in relaying in a kind of junction network to obtain the system of state information, Figure 10 is the composition structural representation of the system of the base station acquisition state information participating in relaying in junction network of the present invention, as shown in Figure 10, comprise via node, the base station participating in relaying and UE, wherein

Via node, for the state information to the UE in base station feedback self or self coverage participating in relaying.

Wherein, participate in the base station of relaying, also for according to the state information obtained, Un interface carries out flow control or scheduling.

Described via node, for feeding back described state information with cycle triggering mode or event triggered fashion.

Below in conjunction with different Relay and the Donor eNB shown in Fig. 4 ~ Fig. 7, chain of command protocol stack implementation between core net, giving an actual example is described in detail the inventive method.Between Relay and Donor eNB chain of command protocol stack be scheme one or scheme three time, feedback granularity is RN or RN E-RAB, and feedback content is the state information of RN.Between Relay and Donor eNB chain of command protocol stack be scheme two or scheme four time, feedback granularity is UE or UE E-RAB, and feedback content is the state information of UE.

In first embodiment, suppose that between Relay and Donor eNB, chain of command protocol stack is scheme one.

DeNB issues a Status Report configuration messages by RRC signaling to RN.Notice RN activation period length, after RN receives Status Report configuration messages, starts Status Report timer.When Status Report timer expiry, RN sends Status Report message to DeNB.Carry RN downstream buffer district occupancy in Status Report message, eat dishes without rice or wine throughput, descending PRB resources occupation rate etc. of Un carry out the useful state information of Flow Control to DeNB at Un interface; After DeNB receives the Status Report message of RN, suppose that the downstream buffer district occupancy knowing RN is greater than default buffer performance threshold value 80%, then DeNB adopts corresponding flow control method at Un interface, to reach the object alleviating the contingent overload problem of RN.It should be noted that, concrete flow control method is that each producer realizes, and is not intended to limit the scope of the invention.

Afterwards, RN can restart Status Report timer.

In second embodiment, suppose that between Relay and Donor eNB, chain of command protocol stack is scheme two.And hypothesis has increased Status Report MAC on RN controls cell, and to have distributed LCID index be 11001 control cell to newly-increased Status Report MAC.When the value of LCID corresponding to this index is 0, do not need to send Status Report message, when the value of LCID corresponding to this index is 1, send Status Report message.

Second embodiment is the mode of event trigger feedback state information.Overload is there is as there is UE when meeting preset trigger condition, then the value of LCID is 1, send Status Report message, now, its radio condition (as L2 measurement report (L2 measurement report), CQIreport etc.), buffer performance, the information such as throughput of eating dishes without rice or wine are sent to RN by the UE in RN coverage; RN utilizes the information obtained from UE to queue up to UE dispatching priority, and such as can decide the priority of UE scheduling according to the buffer performance of UE, its dispatching priority of UE that buffer performance is high is lower, and its dispatching priority of UE that buffer performance is low is higher; The dispatching priority result of UE is carried in StatusReport message as state information by RN, and row shared channel (PUSCH) is upper physically sends; After DeNB receives the Status Report message that RN reports, obtain the dispatching priority of UE, DeNB according to this dispatching priority result, Un mouth will be dispatched UE, completes downlink flow control.

In 3rd embodiment, suppose that between Relay and Donor eNB, chain of command protocol stack is scheme four.And hypothesis has increased Status Report MAC on RN controls cell, and to have distributed LCID index be 11001 control cell to newly-increased Status Report MAC.When the value of LCID corresponding to this index is 0, do not need to send Status Report message, when the value of LCID corresponding to this index is 1, send Status Report message.

3rd embodiment is the mode of event trigger feedback state information.Overload is there is to the trigger condition of RN as there is UE by RRC signaling by DeNB when meeting, then the value of LCID is 1, send Status Report message, now, its radio condition (as descending Physical Resource Block utilance, downlink grouped time delay, descending packet loss, CQI report etc.), buffer performance, the state informations such as throughput of eating dishes without rice or wine are sent to RN by the UE in RN coverage; The state information of acquisition is carried in Status Report message by RN, directly on PUSCH, sends to DeNB; DeNB can carry out priority queueing according to the information in Status Report message to UE, such as can determine according to the descending packet loss of UE (DL packet loss) priority that UE dispatches, its dispatching priority of UE that descending packet loss is high is lower, and its dispatching priority of UE that descending packet loss is low is higher.DeNB according to this dispatching priority result, Un mouth will be dispatched UE, completes downlink flow control.

In 4th embodiment, suppose that between Relay and Donor eNB, chain of command protocol stack is scheme two.

DeNB issues a Status Report configuration messages by RRC signaling to RN.Notice RN activation period length, after RN receives Status Report configuration messages, starts Status Report timer.When Status Report timer expiry, this RN sends Status Report message to DeNB, now, its radio condition (as L2 measurement report, CQI report etc.), buffer area occupation rate, the information such as throughput of eating dishes without rice or wine are sent to RN by the UE under RN coverage.

If in the present embodiment, multiple UE E-RAB is multiplexing on a RN E-RAB according to business principle, and the UE that each UE E-RAB may be corresponding different, the radio condition of different UE is not identical, so each UE E-RAB needs different priority.RN, by the information of the throughput of eating dishes without rice or wine of acquisition, judges some UE E-RAB of poor-performing multiplexing on this RN E-RAB, and the UEE-RAB of better performances, thus judges the UE E-RAB of priority scheduling better performances; The dispatching priority result of multiplexing UE E-RAB on this RN E-RAB is carried in Status Report message as state information and issues DeNB by RN.After DeNB receives the Status Report message that RN E-RAB reports, obtain the dispatching priority of UE E-RAB, consider self known service quality (QoS) priority according to the dispatching priority of this UE E-RAB, Un interface is dispatched UE E-RAB, completes downlink flow control.

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. the base station participating in relaying in a junction network obtains the method for state information, it is characterized in that, via node RN increases a status report media interviews control MAC and controls cell, and in Logic Channel Identifier LCID value list reserved in MAC head, distribution LCID index controls cell to newly-increased status report MAC; The method comprises:

RN feeds back the state information of the user terminal UE in self or self coverage to participating in the base station DeNB of relaying; When status message is the dispatching priority result of UE, described RN comprises to the state information of the user terminal UE in feedback self or self coverage:

Described RN receives radio condition information, buffer performance information and the throughput information of eating dishes without rice or wine that the UE in described RN coverage sends;

Described RN carries out the queuing of UE dispatching priority according to described radio condition information, buffer performance information and throughput information of eating dishes without rice or wine, and obtains the dispatching priority result of described UE;

When the value of described LCID is 1, triggers described RN and the status report messages of the dispatching priority result carrying described UE is sent to DeNB;

After described DeNB receives described status report messages, the dispatching priority result according to described UE is dispatched described UE on Un mouth, completes downlink traffic and controls.

2. method according to claim 1, is characterized in that, described RN feeds back described state information with cycle triggering mode or event triggered fashion.

3. method according to claim 2, is characterized in that, when with the cycle, triggering mode feeds back described state information, comprising:

Described DeNB issues status report configuration messages by radio resource control RRC signaling to described RN, notifies described RN feedback cycle length;

After described RN receives status report configuration messages, starting state report timer, and when status report timer time-out, send the status report messages carrying described state information to described DeNB;

The timing length of described status report timer is feedback cycle length.

4. method according to claim 2, is characterized in that, when feeding back described state information with event triggered fashion, comprising:

Described RN increases a status report MAC and controls cell, and in LCID value list reserved in MAC head, distribution LCID index controls cell to newly-increased status report MAC;

When the value of this LCID is 0, show not need to send described status report messages, when the value of this LCID is 1, show to need to send described status report messages;

If meet trigger condition, then the value of LCID is 1, triggers described RN and sends the status report messages carrying described state information.

5. method according to claim 4, is characterized in that, described trigger condition is what pre-set, or gives described RN's by described DeNB by RRC signaling.

6. method according to claim 1, is characterized in that, described RN to the granularity of the feedback of DeNB is: the enhancing RAB E-RAB on RN or RN; Or, UE or UE E-RAB.

7. method according to claim 2, is characterized in that, when the granularity of described feedback is the enhancing RAB E-RAB on RN or RN, described state information is:

Comprise described RN downstream buffer district occupancy, Un eats dishes without rice or wine throughput, descending PRB resources occupation rate, and other carry out the useful information of Flow Control to described DeNB at Un interface.

8. method according to claim 2, is characterized in that, when the granularity of described feedback is UE or UEE-RAB, described state information is:

Radio condition, the buffer performance of the UE in described RN coverage, throughput of eating dishes without rice or wine; Or, the dispatching priority result of UE; Or, the dispatching priority result of multiplexing UE E-RAB on certain RN E-RAB.

9. the base station participating in relaying in junction network obtains a system for state information, it is characterized in that, comprises via node RN, the base station DeNB participating in relaying and user terminal UE, wherein,

Described RN, for feeding back the state information of the UE in self or self coverage to DeNB; When status message is the dispatching priority result of UE, particularly, described RN receives radio condition information, buffer performance information and the throughput information of eating dishes without rice or wine that the UE in described RN coverage sends;

Described RN carries out the queuing of UE dispatching priority according to described radio condition information, buffer performance information and throughput information of eating dishes without rice or wine, and obtains the dispatching priority result of described UE;

When the value of Logic Channel Identifier LCID is 1, triggers described RN and the status report messages of the dispatching priority result carrying described UE is sent to DeNB;

After described DeNB receives described status report messages, the dispatching priority result according to described UE is dispatched described UE on Un mouth, completes downlink traffic and controls.

10. system according to claim 9, is characterized in that, described RN, for feeding back described state information with cycle triggering mode or event triggered fashion.