CN101835194A - Base station - Google Patents
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- CN101835194A CN101835194A CN200910008197A CN200910008197A CN101835194A CN 101835194 A CN101835194 A CN 101835194A CN 200910008197 A CN200910008197 A CN 200910008197A CN 200910008197 A CN200910008197 A CN 200910008197A CN 101835194 A CN101835194 A CN 101835194A
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- subframe
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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Abstract
The invention relates to a base station, and a method by which the base station communicates with a relay station. The base station comprises a transmit unit (601), a receiving unit (602), a judging unit (603) and a scheduling unit (604), wherein the judging unit (603) is used for judging whether the relay station has signals to be sent to the base station; the scheduling unit (604) is used for scheduling the receiving unit (602) according to the judged result of the judging unit (603), thus when the relay station has signals to be sent to the base station, ensuring that the receiving unit (602) receives the data from the relay station during the one or more uplink subframe periods of being used as the uplink relay subframe except being used for transmitting the uplink subframe aiming at the receiving feedback of data transmitted on an absolute down access link, and the scheduling unit also schedules a mobile station, thus the mobile station does not send data to the relay station during the up trunk link subframe period.
Description
Technical field
The present invention relates to communication system, be specifically related to contain the communication system of transparent relay stations.
Background technology
Along with the fast development of radio multimedium business, the user is more and more higher to the requirement of data communication capacity and transmission quality.Yet, because stop in the complex wireless environments, the influence of factor such as shade, formed many communication dead angle.These will make the user be difficult to two-forty and the high-quality communication service that obtains to continue.In order to address this problem, wireless system adopts relay station that the wireless communication signals between base station and the travelling carriage is transmitted to improve throughput of system and user data rate.
In comprising the wireless communication system of relay station, according to the direct communication object of travelling carriage, travelling carriage can be divided into two classes, be respectively the travelling carriage of base station services and the travelling carriage of relay station service.Fig. 1 has provided the data forwarding process of typical relay station.As shown in Figure 1, UE 1 and UE 2 are the travelling carriage of relay station service, and UE 3 is the travelling carriage of base station services.UE 1 and UE 2 at first send data (relay station reception) to relay station RS, and RS sends to base station BS (relay station forwarding) with collected data (UE 1 data and UE 2 data) then.Should be noted that only to show the travelling carriage collection data that relay station RS serves from relay station among Fig. 1, and with the situation of data forwarding to the base station, relay station can also receive data from the base station and data forwarding be given the travelling carriage of this relay station service.The quantity of UE also is schematic in addition.
Existing travelling carriage standard is not brought any influence when generally requiring in wireless system to add relay station, promptly relay station is transparent to travelling carriage, and travelling carriage is not also known the existence of relay station.Usually, the communication link between base station and the relay station is called repeated link, link is called access link between base station or relay station and the travelling carriage.The base station is called downlink relay link to the communication link of relay station, and relay station is called relay uplink to the communication link of base station; Base station or relay station are called descending access link to the communication link of travelling carriage, and travelling carriage is called up access link to the communication link of relay station or base station.
The inventor finds in the TDD system in making process of the present invention, when introducing relaying, has ACK/NACK feedback and the collision problem that sends data.Be explained below.
In the TDD system, the relay station of adding has only a radio frequency link, so can only be the receipts state or the state of sending out at relay station sometime, can not be in reiving/transmitting state simultaneously.Because in the TDD system, relay station can not be in reiving/transmitting state simultaneously, thereby in downlink relay link, relay station is in the state of receipts, so relay station can not send any data to travelling carriage this moment; In relay uplink, relay station is in the state of sending out, and relay station can not receive the signal from travelling carriage.
Following elder generation carries out simple explanation to the frame structure of existing LTE TDD standard.In LTETDD, a frame is fixed as 10ms, comprises the subframe of 10 1ms.Different according to the quantity of sub-frame of uplink and descending sub frame, LTE TDD has defined 7 kinds of frame structures, i.e. frame structure 0-6 altogether.Some subframe is given down link in the frame of a 10ms, is called downlink subframe, and some subframe is given up link, is called uplink sub-frames.The base station sends data in downlink subframe, and travelling carriage or relay station receive data; Travelling carriage sends data at uplink sub-frames, and relay station or base station receive data.Be that example describes below with Fig. 2.Fig. 2 is the frame structure 3 of LTE TDD, and wherein D represents downlink subframe, and subframe # 0 among the figure, #5-#9 are downlink subframe.S represents special subframe, is subframe # 1 among the figure.Subframe # 1 is used for the base station and transmits synchronizing signal, and travelling carriage sends and inserts signal, and the transmitting-receiving conversion of travelling carriage and base station etc.U represents uplink sub-frames, is subframe # 2 among the figure, #3, #4.If downlink subframe # 9 is used for the data link of base station to relay station, then subframe # 9 is called the downlink relay link subframe, and other downlink subframe are called descending access link subframe.If uplink sub-frames # 2 is used for the data link of relay station to the base station, then subframe # 2 is called the relay uplink subframe, and other uplink sub-frames are called up access link subframe.
For down link, can with the downlink relay link sub-frame configuration broadcast multi-broadcasting single frequency network (MBSFN) subframe, be used to transmit the data of base station to relay station.The time-frequency structure of typical MBSFN subframe as shown in Figure 3, wherein, all travelling carriages receive information such as control signaling from base station or relay station, frequency pilot sign in the previous of MBSFN subframe or two OFDM symbols, the OFDM symbol of back is sightless to all travelling carriages, so can use the OFDM symbol of MBSFN subframe back to transmit the data-signal of base station to relay station.
Because broadcast channel, addressing channel, synchronizing channel etc. need be at descending sub frame or special subframe # 0, #1, #5, transmit among the #6, so these four subframes can not be used as the MBSFN subframe, can only be as descending access link subframe, in this article, for the convenience that illustrates, can only be called absolute descending access link subframe as the subframe of descending access link subframe.
Travelling carriage need send decoding response signal ACK/NACK (also claiming to receive feedback in this article) to base station and relay station after receiving the data that base station or relay station send, wherein ACK represents to decipher correct signal, and NACK represents the signal of decoding error.In order after adding relay station the standard of existing LTE TDD not to be brought any influence, the feedback of ACK/NACK must be followed the standard of existing LTE TDD.Regulation need be greater than 3ms to the time delay the feedback of ACK/NACK from receiving data in the existing standard.With Fig. 4 is example, and wherein the third line is the feedback position of the fixing ACK/NACK of the data correspondence transmitted in each subframe.As shown in Figure 4, must feed back in subframe # 4 at the ACK/NACK of the data that send among the descending sub frame # 0, the ACK/NACK of the data that send at sub-frame of uplink # 2 must feed back at subframe #8.Note that it is to stipulate in the standard that herein ACK/NACK feeds back, and does not generally change in which subframe.
Because subframe # 0, #1, #5, #6 can not be as the MBSFN subframes, promptly the downlink relay link subframe sends data to travelling carriage transmission data or relay station to travelling carriage so these subframes can only be used for the base station.And because travelling carriage receives that the ACK/NACK that produces after the data must send in the fixedly sub-frame of uplink of correspondence.If these sub-frame of uplink are used to relay uplink, then because relay station is to be in transmit status in relay uplink, so relay station can't receive the ACK/NACK from travelling carriage, collision has taken place promptly.
With Fig. 4 is the generation that example illustrates this collision, and subframe # 2 is the relay uplink subframe among Fig. 4, and promptly data are transmitted to BS by RS.Subframe # 9 is the MBSFN subframe, i.e. the downlink relay link subframe.At the subframe # 2 of next frame by the travelling carriage corresponding ACK/NACK of data that relay station sent in relay station feedback and subframe # 5, #6, but since this moment subframe # 2 as relay uplink, be that relay station is in transmit status, so relay station can't receive the ACK/NACK that the travelling carriage of relay station service feeds back.The collision of ACK/NACK and transmission data promptly appears.
To above-mentioned ACK/NACK feedback and the collision problem that sends data, also do not provide concrete solution in the LTE TDD standard.
In the MBSFN subframe, can transmit base station or relay station to reception feedback (ACK/NACK) from travelling carriage.In some cases, also can exist relay station to travelling carriage transmission ACK/NACK and from the collision between the base station reception data.
Explanation to routine techniques above should be noted that is just for convenience carried out clear, complete explanation to technical scheme of the present invention, and makes things convenient for those skilled in the art's understanding to set forth.Can not only partly carry out setting forth and thinking that technique scheme is conventionally known to one of skill in the art in background technology of the present invention because of these schemes.
Below listed list of references of the present invention, by reference they have been incorporated into this, as having done detailed description in this manual.
1, [patent documentation 1]: Tak-ki Yu, et al., Method and apparatus for allocatingpeer-to-peer resource in relay based wireless communication system (US20090034447A1);
2, [patent documentation 2]: Jeffrey D.Bonta, et al., System and method of resourceallocation within a communication system (US 20090034432A1);
3, [patent documentation 3]: Relay system and method for bandwidth allocation andscheduling (US 20080316954A1);
4, [patent documentation 4]: Radio resource management in wireless cellularnetworks having multihop relay stations (US 20080220790A1);
5, [patent documentation 5]: Flexible radio resource sharing in time and frequencydomains among TDD communication systems (US 20080144612A1);
5, [non-patent literature 1]: Nokia, Considerations on TDD Relay, 3GPPTSG-RAN1, R1-090244;
6, [non-patent literature 2]: LG, UL subframe stealing for in-band relaying inTDD mode, 3GPP TSG-RAN1, R1-090225.
Summary of the invention
Embodiments of the present invention are made in view of the foregoing problems of prior art, are used for solving or alleviating the problem of ACK/NACK and data collision (hereinafter claiming the ACK/NACK collision).
In order to realize above purpose, the invention provides following aspect:
Aspect 10, a kind of base station, this base station comprises transmitting element, receiving element, judging unit and scheduling unit, wherein
Described judging unit is used to judge whether relay station has will send to described signal of base station;
Scheduling unit is dispatched receiving element according to the judged result of judging unit, thereby in as the downlink subframe outside absolute descending access link subframe specific sub-frame, described, receive described signal from this relay station, and described scheduling unit is notified described relay station: send described signal in the downlink subframe corresponding with described specific sub-frame, described scheduling unit is notified mobile radio station: the downlink subframe corresponding with described specific sub-frame is the MBSFN subframe.
Aspect 11, a kind of dispatching method, may further comprise the steps: determining step, judge the base station data whether oriented relay station sends, the scheduling step, when described determining step is judged the data of oriented described relay station transmission, then at a certain descending sub frame, described base station sends data to relay station, and this descending sub frame of notice travelling carriage is the MBSFN subframe; And dispatch, thereby travelling carriage does not transmit data to relay station during the subframe of the feedback that transmits the data that transmit at this descending sub frame.
Aspect 12, a kind of dispatching method, may further comprise the steps: determining step, judge the relay station data whether oriented base station sends, the scheduling step, when judging relay station the data that will send the base station to arranged, optional a certain sub-frame of uplink is as the relay uplink subframe, dispatch and make this relay station in the subframe that its feedback information carries, not send to the downlink data of travelling carriage on this sub-frame of uplink, and dispatch and make travelling carriage during this sub-frame of uplink, not send upstream data to described relay station.
Aspect 13, according to the dispatching method of aspect 12, wherein, further comprising the steps of: as to dispatch described relay station and make described relay station in the descending sub frame of the feedback of the data that carrying transmits in to this sub-frame of uplink, not send signal to travelling carriage.
Aspect 14, a kind of base station, this base station comprises transmitting element, receiving element, judging unit and scheduling unit, and wherein said judging unit is used to judge whether this relay station has will send to this signal of base station and whether described base station has the signal that will send to described relay station; Scheduling unit is dispatched according to the judged result receiving element of judging unit, thereby (1) have at described relay station and will send to this signal of base station and described base station when the signal that will send to described relay station is arranged, make described receiving element as the relay uplink subframe, be used to transmit at the signal that receives during one or more uplink sub-frames beyond the uplink sub-frames of the reception feedback of the data that transmit on the absolute descending access link subframe from described relay station, and described scheduling unit is also dispatched travelling carriage and relay station, thereby described travelling carriage does not send data to described relay station during described relay uplink subframe, make described transmitting element as the downlink relay link subframe, it receives feedback and send described data to described relay station during one or more downlink subframe that transmits on this relay uplink subframe, described scheduling unit is notified described travelling carriage: is the MBSFN subframe with this as the corresponding downlink subframe of described downlink relay link subframe, and described scheduling unit is dispatched described relay station, thereby described relay station does not send data to travelling carriage during described downlink relay link subframe; Or have at described relay station and will send to this signal of base station and described base station when the signal that will send to described relay station is arranged, in as the downlink subframe outside absolute descending access link subframe specific sub-frame, described, receive data, and described scheduling unit is notified to described relay station: in the downlink subframe corresponding, send upstream data with described specific sub-frame from this relay station; (2) judge signal that the oriented described relay station in base station sends but relay station during at described determining step not to signal that described base station sends, make at a certain descending sub frame, described base station sends signal to relay station, and this descending sub frame of notice travelling carriage is the MBSFN subframe; And dispatch, thereby travelling carriage does not transmit data to relay station during the subframe of the feedback that transmits the data that transmit at this descending sub frame; (3) when judging relay station the data that will send the base station to arranged, optional a certain sub-frame of uplink is as the relay uplink subframe, dispatch and make this relay station in the subframe that its feedback information carries, not send to the downlink data of travelling carriage on this sub-frame of uplink, and dispatch and make travelling carriage during this sub-frame of uplink, not send upstream data to described relay station.
With reference to the following description and accompanying drawing, of the present invention these will become clearer with further aspect and feature.In described explanation and accompanying drawing, specific implementations of the present invention is disclosed in detail, having indicated principle of the present invention can adopted mode.Should be appreciated that, the present invention on scope not thereby be restricted.In the scope of the spirit of claims and clause, the present invention includes many changes, revise and be equal to.
Can in one or more other execution mode, use in identical or similar mode at the feature that a kind of execution mode is described and/or illustrated, combined with the feature in other execution mode, or the feature in alternative other execution mode.
Should emphasize that term " comprises/comprise " existence that refers to feature, whole, step or assembly when this paper uses, but not get rid of the existence of one or more further feature, whole, step or assembly or additional.
With reference to following accompanying drawing a lot of aspects that the present invention may be better understood.Parts in the accompanying drawing are not proportional draftings, and just for principle of the present invention is shown.For the ease of illustrating and describe some parts of the present invention, counterpart may be exaggerated in the accompanying drawing, that is, make it become bigger with respect to other parts in the exemplary means of the actual manufacturing of foundation the present invention.Element of describing in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with element and the feature shown in one or more other accompanying drawing or the execution mode.In addition, in the accompanying drawings, similarly label is represented corresponding components in several accompanying drawings, and can be used for indicating the corresponding component that uses more than in a kind of execution mode.
Description of drawings
Accompanying drawing shows the preferred embodiments of the present invention, has constituted the part of specification, is used for explaining principle of the present invention in further detail with explanatory note.Wherein:
Fig. 1 shows the data forwarding process of typical relay station system;
Fig. 2 shows the configuring condition of the up-downgoing repeated link subframe of LTE TDD system frame structure 3 and selection;
Fig. 3 shows the time-frequency structure of MBSFN subframe;
Fig. 4 shows LTE TDD system frame structure 3, and the collision problem of ACK/NACK has been described;
Fig. 5 has schematically provided the frame structure 3 according to first execution mode of the present invention;
Fig. 6 shows the structural representation according to the base station of first embodiment of the invention;
Fig. 7 is schematically illustrated under the situation that adopts frame structure 3 shown in Figure 5, the processing in the base station BS shown in Figure 6;
Fig. 8 has schematically shown the time sequential routine figure of the communication system of embodiment of the present invention;
Fig. 9 has schematically provided the structure of the specific sub-frame of a kind of embodiment;
Figure 10 schematically shows the frame structure 3 according to second embodiment of the invention;
Figure 11 schematically shows the another kind of frame structure 3 according to second embodiment of the invention;
Figure 12 shows at tdd frame structure 3 shown in Figure 5, when not having the data communication that is relayed to the base station, for solving the scheduling that the ACK/NACK collision problem adopts;
Figure 13 shows at tdd frame structure 3 shown in Figure 5, and there is the data communication that is relayed to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relaying, for solving the scheduling that the ACK/NACK collision problem carries out;
Figure 14 shows at tdd frame structure 3 shown in Figure 5, and there be the data communication of relay station to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the scheduling that the ACK/NACK collision problem carries out;
Figure 15 shows the tdd frame structure 3 at second execution mode, and there is the data communication that is relayed to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the scheduling that the ACK/NACK collision problem carries out;
Figure 16 shows according to embodiments of the present invention, and at LTE tdd frame structure 3, certain 10ms frame exists the base station to arrive the data communication of relay station, when not having relay station to the data communication of base station, for solving the scheduling that the ACK/NACK collision problem is adopted;
Figure 17 shows according to embodiments of the present invention, and at LTE tdd frame structure 3, there be the data communication of relay station to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the scheduling that the ACK/NACK collision problem adopts;
Figure 18 shows LTE tdd frame structure 3, and there be the data communication of relay station to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the dispatching method that the ACK/NACK collision problem adopts; And
Figure 19 has schematically shown the flow chart of the dispatching method of another embodiment of the present invention.
Embodiment
Be example with the general communication system that comprises relay station below, come the method and apparatus of embodiment of the present invention is described with reference to accompanying drawing.
First execution mode
In first embodiment of the invention, the uplink sub-frames that the feedback of the data that upward transmit at absolute descending access link subframe (for example subframe # 0, #1, #5, #6) need not be transmitted in the base station is set at the relay uplink subframe.And the descending access link subframe that the ACK/NACK feedback at the data that transmit on it that will be in descending access link subframe transmits on the relay uplink subframe of this setting is set at the downlink relay link subframe, i.e. the MBSFN subframe.
Fig. 5 has schematically provided the frame structure 3 according to first execution mode of the present invention.
As shown in Figure 5, three uplink sub-frames are arranged, i.e. subframe # 2, #3, #4 in frame structure 3.Subframe # 2 need transmit the ACK/NACK feedback that goes up the data that transmit at absolute descending access link subframe (subframe # 5, #6), thereby subframe # 2 should be set at the relay uplink subframe.Similarly, subframe # 4 will transmit the ACK/NACK feedback that absolute descending access link subframe (subframe #0) goes up the data that transmit, thereby subframe # 4 should be set at the relay uplink subframe.Thereby, subframe # 3 is set at the relay uplink subframe.
Three non-absolute downlink subframe, i.e. subframe # 7, #8, #9 are arranged in frame structure 3.The ACK/NACK feedback that goes up the data that transmit at subframe # 9 transmits on subframe # 4, and the ACK/NACK feedback that goes up the data that transmit at subframe # 7 and #8 is in upward transmission of subframe #3 (also claiming the subframe corresponding with the relay uplink subframe, because it be the corresponding subframe at other frames).Thereby subframe # 7 and #8 be set at the downlink relay link subframe.
In the example depicted in fig. 5, in subframe # 2, transmit, and subframe # 2 is as relay uplink, thereby this moment, relay station was in the state of receipts, can not cause the ACK/NACK collision at the ACK/NACK feedback of the data of the transmission on subframe # 5 and the #6.Equally, because subframe 7 and subframe 8 are all as the MBSFN subframe, be used to transmit data and the ACK/NACK information of BS, so travelling carriage does not have the ACK/NACK feedback generation yet, so also can not cause the ACK/NACK collision because subframe # 3 has become relay uplink to RS.
Fig. 6 shows the structural representation according to the base station of first embodiment of the invention.As shown in Figure 6, the base station according to first embodiment of the invention comprises transmitting element 601, receiving element 602, judging unit 603 and scheduling unit 604.
Transmitting element 601 is used for sending various data, control command, pilot signal etc. to the travelling carriage of relay station or base station services, and receiving element 602 is used for receiving various data, feedback etc. from the travelling carriage of the direct service of relay station or base station.The base station in two or three the OFDM symbol in the front of each descending sub frame to relay station with travelling carriage sends control signaling and pilot tone, wherein control the schedule information that signaling comprises the base station, promptly notify travelling carriage or relay station to receive data, and notify travelling carriage and relay station to send data etc. to the base station in which time frequency unit of which sub-frame of uplink in which time frequency unit of this subframe.After the control signaling also comprises the base station and receives the data of travelling carriage or relaying, to the ACK/NACK of travelling carriage or relaying feedback.
Judging unit 603 is used to judge whether the base station has the data that will send to relay station, and judges whether relay station has the data that will send to the base station.
In first execution mode of the present invention, transmitting element is gone up reception from the data of relay station, ACK/NACK etc. at the uplink sub-frames (i.e. the relay uplink subframe of She Dinging) of the feedback that need not transmit the data that go up to transmit at absolute descending access link subframe (for example subframe # 0, #1, #5, #6).And in descending access link subframe, during the descending access link subframe that transmits on the relay uplink subframe of this setting, be sent to the downlink data, ACK/NACK etc. of relay station to relay station at the ACK/NACK of the data that transmit on it feedback.
Fig. 7 shows under the situation that adopts frame structure 3 shown in Figure 5, the processing in the base station BS shown in Figure 6.
At first, the judging unit 603 of base station judges whether the base station will send data to relay station and judge whether relay station will send a signal to base station (S700).If the base station will send a signal to relay station and relay station will send a signal to base station (S701, be), then at step S704, the scheduling unit 604 of base station is dispatched, make travelling carriage not send upstream data in relay uplink subframe (subframe 3), and make relay station in downlink relay link subframe (subframe 8), not send to the signal (scheduling 1) of travelling carriage, and make transmitting element 601 on the downlink relay link of determining, send to the signal of relay station, and make receiving element 602 receive signal from relay station in the relay uplink of determining at step S706 at step S705.Relay station does not have signal will send to base station (S702 if the base station has signal will send to relay station, be), then because at subframe #7 or #8, relay station is in accepting state, thereby for avoiding collision, thereby at step S707, the scheduling unit 604 of base station is dispatched (scheduling 2), makes relay station not send data to travelling carriage in this subframe (subframe #7 or #8), and this subframe of notice travelling carriage is the MBSFN subframe, and in step S708, in this MBSFN subframe, send signal to relay station.Relay station has signal will send to base station (S703 if the base station does not have signal will send to relay station, be), then because relay station is in transmit status in this subframe, thereby the scheduling unit 604 of base station is dispatched, make travelling carriage not send upward signal (S709), in the relay uplink subframe, receive signal (S710) then from relay station in relay uplink subframe (subframe #3).If the base station does not have signal will send to relay station and relay station does not have signal will send to the base station, then the scheduling unit 604 of base station is not dispatched especially, and carries out routine scheduling (S711) same as the prior art.
But the judging unit 603 of base station can send to the data of relay station according to the needs of a downlink relay link subframe data quantity transmitted and the storage of place, base station and determine whether that needs send the data to relay station.Particularly, for example, but when data quantity stored during greater than a downlink relay link subframe data quantity transmitted, the base station can be dispatched and be carried out data to relay station and send.
In like manner, but the judging unit 603 of base station according to the data volume that the relay station place of a relay uplink subframe data quantity transmitted and base station place monitoring receives, judging whether relay station has need be to the data of its transmission.Particularly, for example, but during greater than a relay uplink subframe data quantity transmitted, can judge that relay station need send data to it in the data volume that receives when relay station.
Whether travelling carriage sends data at certain sub-frame of uplink to base station or relaying is control signaling decisions of being sent by before certain corresponding descending sub frame, if the base station allows travelling carriage to send data in certain sub-frame of uplink, then the base station sends control signaling to travelling carriage in previous two or three OFDM symbols of this corresponding descending sub frame, indicate it and whether be allowed to this sub-frame of uplink transmission data, and indicate the shared running time-frequency resource of transmission data etc.
Fig. 8 has schematically shown the time sequential routine figure of the communication system of embodiment of the present invention.
In a frame, the transmitting element of base station travelling carriage to base station services in as previous in the MBSFN subframe (subframe # 7 or #8) of downlink relay link subframe or two OFDM symbols sends information (S100) such as pilot tone and control signaling, and the travelling carriage to the relay station service in preceding several OFDM symbols of relay station in this MBSFN subframe sends information (S110) such as pilot tone and control signaling.
The base station sends information (S120) to relay station in OFDM symbol subsequently.And relay station receives the information that sends from the base station in OFDM symbol subsequently.
Receive in preceding several OFDM symbols of travelling carriage in this MBSFN subframe from information such as the pilot tone of base station or relay station or control signalings, do not receive any information At All Other Times.
Simultaneously, in relay uplink subframe # 3, the base station receives the information that sends from relay station; Relay station sends information (S130) to the base station; For all travelling carriages, under the scheduling of base station, in this sub-frame of uplink, keep silent.
The figure that should be noted that Fig. 8 is that schematically the processing of having omitted base station, relay station and travelling carriage in other subframe is to be illustrated more clearly in the characteristics of embodiment of the present invention.
As can be seen, the frame structure that travelling carriage is followed does not change fully, thereby travelling carriage need not done any change from top description.
Second execution mode
In second execution mode of the present invention, the base station becomes specific sub-frame with a certain descending access link subframe, and specific sub-frame as the MBSFN subframe, receives the control signaling from base station and relay station for all travelling carriages.Be used as specific sub-frame for relay station, be used for sending control signaling, and be used for sending data to the base station to the travelling carriage of relay station service., be used for sending control signaling, and be used to receive the data that relay station sends as specific sub-frame for the base station to the travelling carriage of base station services.
Fig. 9 has schematically provided the structure of the specific sub-frame of a kind of embodiment.As shown in Figure 9, for all UE, this subframe shows as MBSFN, and promptly in previous or two OFDM symbols, the user that BS and RS are respectively service separately sends control signaling and pilot tone etc., and this moment, BS was a transmit status.For the convenience that illustrates, the time that claims BS to be in transmit status in this specific sub-frame is the descending period.Ensuing a bit of time (base station determines the length of this section period), BS transfers accepting state to by transmit status.Can be called the first conversion period or the first protection period during this period of time, can should the period yet.BS receives the forwarding data from RS in the ensuing time then, and this section period is called the up period.Herein, in the crack, feedback will send to relay station if there is ACK/NACK the base station at this moment, and then this ACK/NACK feedback can send with the data multiplex of base station to relay station.Last BS transfers transmit status to by accepting state, can be called the second conversion period or the second protection period during this period of time, also can not have this period.
In addition, though in the example depicted in fig. 9, transmit time segments only transmits control signaling, pilot tone etc., in the embodiment of alternative, also can transmit the data of BS to RS in some symbols.
Figure 10 schematically shows the frame structure 3 according to second embodiment of the invention.As shown in figure 10, non-absolute downlink subframe # 7 in the descending sub frame is configured to specific sub-frame, and will carry another non-absolute downlink subframe at the receiving feedback information of the data that transmit on this specific sub-frame, for example subframe # 8 or #9 are (in the example of Figure 10, be depicted as subframe #9), be set at the MBSFN subframe.These two subframes (#7 and #9) of the scheduling unit of base station notice travelling carriage are the MBSFN subframes simultaneously, and this subframe 7 of notice relay station is that specific sub-frame, subframe 9 are the MBSFN subframe.The explanation that it should be noted that the front is exemplary, also can be with other subframe, and for example some absolute downlink subframe are set to specific sub-frame.Equally, also a certain absolute downlink subframe can be provided with the feedback subframe of carrying at the feedback of the data that transmit on this specific sub-frame.
In addition, should note, though in the example of Figure 10, with subframe # 9 as the downlink relay link subframe, but also can only subframe 7 be configured to specific sub-frame and other downlink relay link subframe (specific sub-frame had both transmitted the data of BS to RS, when also transmitting RS to the data of BS) is not set in addition.In addition, though in the example of Figure 10, subframe 7 is configured to specific sub-frame, also other subframe (for example subframe 8 and subframe 9) can be set at specific sub-frame.In addition, a plurality of specific sub-frame can be set.
When there was relay station to the data communication of base station in certain 10ms frame, at first at specific sub-frame # 7, RS sent to the data of BS.After BS receives data, send feedback to the data that received at the subframe # 9 of next frame.Because for travelling carriage, subframe # 7 and subframe # 9 are descending sub frames, thereby the ACK/NACK collision can not take place.Equally, in certain 10ms frame, when the base station had to the data communication of relay station, it transmitted at subframe # 9, and RS can send at the subframe # 7 of next frame the feedback of the data that receive.Because for travelling carriage, subframe # 7 and subframe # 9 are descending sub frames, thereby the ACK/NACK collision can not take place yet.
In addition, be not provided with except that specific sub-frame under the situation of other MBSFN, feedback that can specific sub-frame is set to this specific sub-frame self.This for example as shown in figure 11.At this moment only needing to travelling carriage notice subframe # 7 is that the MBSFN subframe gets final product.
Like this, in second execution mode of the present invention, the frame structure that travelling carriage is followed does not change yet, though the frame structure between relay station and the base station is different with frame structure and the frame structure between relay station and the travelling carriage between base station and the travelling carriage, the agreement between base station and the relay station is to be easy to realize comparatively speaking.
In second execution mode, the transmitting element 601 of base station is used for sending various data, control command, pilot signal etc. to the travelling carriage of the direct service of relay station or base station, and receiving element 602 is used for receiving various data, feedback etc. from the travelling carriage of the direct service of relay station or base station.
Judging unit 603 is used to judge whether the base station has the data that will send to relay station, and judges whether relay station has the data that will send to the base station.
In addition, the base station of second embodiment of the invention can also comprise regulon, this regulon will send to the data of relay station and quantity that relay station will be issued the data of base station, type, priority, pressing degree etc. or their combination in any according to the base station, and the length of descending time slot in the specific sub-frame and ascending time slot is adjusted.This regulon can also be adjusted the duration of the first protection time slot and the second protection time slot according to channel quality, qos requirement etc.
In addition, second execution mode can with the first execution mode combination, for example in frame structure shown in Figure 53, subframe 7 and/or subframe 9 can be set to specific sub-frame.
Though should be noted that above description to embodiment of the present invention is is the carrying out of example with frame structure 3, should be noted that this is not a limitation of the present invention.For example, for frame structure 1, can be with subframe # 3 as the relay uplink subframe, and simultaneously with subframe # 9 as the MBFSN subframe.Also can be with subframe # 8 as the relay uplink subframe, and simultaneously with subframe # 4 as the MBFSN subframe.Also can be with subframe # 3 and #8 all as the relay uplink subframe, and simultaneously with subframe # 4 and #9 all as the MBFSN subframe.
For frame structure 4, among subframe # 4, #7, #8 and the #9 one or more can be set at specific sub-frame.
For frame structure 2, subframe # 3 can be set at specific sub-frame.Perhaps also can be with can be with subframe # 2 as the relay uplink subframe, and simultaneously with subframe # 8 as the MBFSN subframe.
Embodiments of the present invention also disclose a kind of relay, and it comprises transmitting element, receiving element, judging unit and scheduling unit.Whether judgment unit judges has data will send to the base station and whether the base station has data will send to relay station, scheduling unit is dispatched transmitting element according to the judged result of judging unit, thereby transmitting element can receive the data at this relay station from the base station in the descending time slot of particular time-slot, and receiving element can send the data of relay station to the base station in the ascending time slot of particular time-slot.
The invention discloses a kind of frame structure, comprise specific sub-frame in this frame structure, promptly not only comprised as the time slot of MBFSN subframe but also comprise frame as the time slot of relay uplink subframe.
The invention also discloses a kind of frame structure, in this frame structure be not used in transmission at the uplink sub-frames of the ACK/NACK of the data that transmit on absolute descending access link feedback as the relay uplink subframe, and will receive and feed back the downlink subframe that on this relay uplink subframe, transmits as the downlink relay link subframe.
Below the scheduling in execution mode 1 and 2 is described in detail.
Figure 12 shows at tdd frame structure 3 shown in Figure 5, when not having the data communication that is relayed to the base station, for solving the scheduling that the ACK/NACK collision problem adopts.In the example depicted in fig. 12, after having considered that relay data is issued in the base station, relaying can be to base station feedback ACK/NACK, as shown in figure 12, subframe # 7 among the frame # 0 and subframe # 8 are as the downlink relay link subframe, be used to transmit the data of BS to RS, after RS receives data, according to standard code, need be in the subframe # 3 among the frame # 1 by relaying to base station feedback ACK/NACK, promptly among the subframe # 3, relaying is in the state of sending out, so the scheduling travelling carriage does not proceed to the data transmission of relay station in the subframe corresponding with the relay uplink subframe, only dispatch the data transmission of travelling carriage to the base station.
Figure 13 shows tdd frame structure 3 shown in Figure 5, and there is the data communication that is relayed to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relaying, for solving the scheduling that the ACK/NACK collision problem carries out.In the example of Figure 13, after relay station was issued base station data, the base station was not to relaying feeding back ACK/NACK.As shown in figure 13, subframe # 3 among the frame # 1 is as the relay uplink subframe, be used to transmit the data of RS to BS, be among the subframe # 3, relaying is in the state of sending out, because subframe # 7 and subframe # 8 correspondence subframe # 3 feeding back ACK/NACK in frame # 1 among the frame # 0, do not send to the data of travelling carriage so do not dispatch relay station among the frame # 0 among subframe # 7 and the subframe # 8, only dispatch the data transmission of base station to travelling carriage.
Figure 14 shows at tdd frame structure 3 shown in Figure 5, and there be the data communication of relay station to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the scheduling that the ACK/NACK collision problem carries out.After relay station was issued base station data, the base station can be to relaying feeding back ACK/NACK, and as shown in figure 14, the subframe #3 among the frame #1 is used to transmit the data of RS to BS as the relay uplink subframe, and promptly among the subframe #3, relaying is in the state of sending out.With identical among Figure 12,, only dispatch the base station and send to the data of travelling carriage because subframe #7 and subframe #8 correspondence subframe #3 feeding back ACK/NACK in frame #1 among the frame #0 do not send so do not dispatch the data that are relayed to travelling carriage among subframe #7 and the subframe #8 in frame #0.In addition, because after RS sends data to BS in the subframe #3 of frame #1, according to standard code, BS need be in the subframe #8 of frame #1 feeding back ACK/NACK, be that RS is in the receipts state at the subframe #8 of frame #1,, only dispatch the data transmission of BS to UE so do not dispatch the data transmission of RS to UE.
Figure 15 shows the tdd frame structure 3 of second execution mode, and there is the data communication that is relayed to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the scheduling that the ACK/NACK collision problem carries out.After relay station is issued base station data, the base station can be to relay station feeding back ACK/NACK, as shown in figure 15, subframe # 7 is configured to designed specific sub-frame among the frame # 0, is used to send the data of RS to BS, after BS receives data, appoint in the subframe # 5 of frame # 1 that by BS to RS feeding back ACK/NACK, promptly RS is in the receipts state at subframe # 5, notify this subframe of travelling carriage # 5 this moment is the MBSFN subframe, do not dispatch the data transmission of RS, only dispatch the data transmission of BS to UE to UE.
On the other hand, according to other execution modes of the present invention, when judging the data of having only base station transmission relay station or having only relay station to send to the data of base station, also can between relay station and base station, adopt simple relatively frame structure.
Figure 16 shows LTE tdd frame structure 3, and certain 10ms frame exists the base station to arrive the data communication of relay station, when not having relay station to the data communication of base station, for solving the scheduling that the ACK/NACK collision problem is adopted.The base station is after optional downlink relay link is issued the relay station data, relay station can be to base station feedback ACK/NACK, as shown in figure 15, subframe # 9 among the frame # 0 is as the downlink relay link subframe, be used to transmit the data of BS to RS, after RS receives data, according to standard code, need be in the subframe # 4 among the frame # 1 by relay station to base station feedback ACK/NACK.Be among the subframe # 4, relay station is in the state of sending out, so do not dispatch the data transmission of travelling carriage to relay station this moment, only dispatches the data transmission of travelling carriage to the base station.
Note herein, because the subframe # 9 feedback of the ACK/NACK of corresponding any sub-frame of uplink not among the frame # 0, so the subframe scheduling before the subframe # 9 is unfettered.
In this execution mode, whether the judgment unit judges relay station has will send to signal of base station (as ACK/NACK), scheduling unit is dispatched (scheduling 4), make when relay station sends to signal of base station, make travelling carriage can not send signal to relay station, particularly, BS to RS at a certain descending sub frame, the transmission data send, this descending sub frame of notice travelling carriage is the MBSFN subframe, and dispatch, thereby travelling carriage does not transmit data during the subframe of the feedback that transmits the data that transmit at this descending sub frame.
Figure 17 shows at LTE tdd frame structure 3, there be the data communication of relay station to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the scheduling that the ACK/NACK collision problem adopts, after having considered that relay station is issued base station data, the base station can be to relay station feeding back ACK/NACK.As shown in figure 17, subframe # 4 among the frame # 1 is as the relay uplink subframe, be used to transmit the data of RS to BS, be among the subframe # 4, relay station is in the state of sending out, because subframe # 9 correspondence subframe # 4 feeding back ACK/NACK in frame # 1 among subframe # 0 and the frame # 0 among the frame # 1, do not send to the data of relay station so in frame # 1, do not dispatch travelling carriage among subframe # 0 and the frame # 0 among the subframe # 9, only dispatch the data transmission of base station to travelling carriage.
In this execution mode of the present invention, the dispatching method in a kind of base station comprises determining step, judges the relay station data whether oriented base station sends; Scheduling step (scheduling 5), when judging relay station the data that will send the base station to arranged, optional a certain sub-frame of uplink is as the relay uplink subframe, make relay station in this sub-frame of uplink, send data, and dispatch and make this relay station in the subframe that its feedback information carries, not send to the downlink data of travelling carriage on this sub-frame of uplink, and dispatch and make travelling carriage during this sub-frame of uplink, not send upstream data to described relay station.
Figure 18 shows LTE tdd frame structure 3, there be the data communication of relay station to the base station in certain 10ms frame, when not existing the base station to arrive the data communication of relay station, for solving the dispatching method that the ACK/NACK collision problem adopts, after the method had considered that relay station is issued base station data, the base station can be to relay station feeding back ACK/NACK.As shown in figure 18, subframe #4 among the frame #1 is as the relay uplink subframe, be used to transmit the data of RS to BS, be among the subframe #4, relay station is in the state of sending out, with identical among Fig. 9, owing to subframe #9 correspondence subframe #4 feeding back ACK/NACK in frame #1 among subframe #0 among the frame #1 and the frame #0, so in frame #1, do not dispatch the data transmission of travelling carriage among subframe #0 and the frame #0 among the subframe #9, only dispatch the data transmission of base station to travelling carriage to relay station.In addition, because after BS sends data to RS among the subframe #4 in frame #1, according to standard code, RS need be in the subframe #0 of frame #2 feeding back ACK/NACK, be that RS is in the state of sending out at the subframe #0 of frame #2,, only dispatch the data transmission of BS to UE so do not dispatch the data transmission of RS to UE.
That is, in this execution mode of the present invention, the dispatching method in a kind of base station comprises determining step, judges the relay station data whether oriented base station sends; Scheduling step (scheduling 6), when judging relay station the data that will send the base station to arranged, optional a certain sub-frame of uplink is as the relay uplink subframe, make relay station in this sub-frame of uplink, send data, and dispatch and make this relay station not send to the downlink data of travelling carriage on this sub-frame of uplink in the subframe that its feedback information carries, and the dispatching of relays station no longer carries in the descending sub frame to the feedback of carrying in this sub-frame of uplink relay station to send signal to travelling carriage.The base station is also dispatched and is made travelling carriage not send upstream data to described relay station during this sub-frame of uplink.
Figure 19 has schematically shown the flow chart of the dispatching method of another embodiment of the present invention.
As shown in figure 19, at first, the judging unit 603 of base station judges whether the base station will send data to relay station and judge whether relay station will send data to base station (S700).If the base station will send data to relay station and relay station will send data to base station (S701, be), then at step S704 ', the scheduling unit 604 of base station is dispatched, make travelling carriage not send upstream data in relay uplink subframe (subframe 3), and make relay station in downlink relay link subframe (subframe 8), not send to the data (scheduling 1 ') of travelling carriage, and on step S705 makes in downlink relay link that transmitting element 601 determining or the specific sub-frame, send to the data of relay station, and make receiving element 602 receive data from relay station in specific sub-frame at step S706 '.Relay station does not have data will send to base station (S702 if the base station has data will send to relay station, be), then at step S707 ', the scheduling unit 604 of base station is dispatched (scheduling 4), and in step S708, in the MBSFN subframe, send data to relay station.Relay station has data will send to base station (S703 if the base station does not have data will send to relay station, be), then because relay station is in transmit status in this subframe, thereby the scheduling unit 604 of base station is dispatched (scheduling 5 or 6), make travelling carriage not send upstream data (S709), in the relay uplink subframe, receive data (S710) then from relay station in the relay uplink subframe.If the base station does not have data will send to relay station and relay station does not have data will send to the base station, then the scheduling unit 604 of base station is not dispatched especially, and carries out routine scheduling (S711) same as the prior art.
The above device of the present invention can be realized by hardware, also can be realized by combination of hardware software.The present invention relates to such computer-readable program, when this program is performed by the logical block of base station, can make this base station realize base station or component parts mentioned above, or make this base station realize the whole bag of tricks or step mentioned above.The present invention relates to such computer-readable program, when this program is performed by the logical block of relay station, can make this relay station realize relay station or component parts mentioned above, or make this relay station realize the whole bag of tricks or step mentioned above.The invention still further relates to the storage medium that is used to store above program, as hard disk, disk, CD, DVD, flash etc.
Certain embodiments of the present invention has more than been described.Certainly, those of ordinary skill in the art understands that more arrangement of the present invention and combination are possible.Therefore, all changes in claims spirit and scope of the present invention, modifications and variations are all due among protection scope of the present invention.
Claims (10)
1. base station, this base station comprises transmitting element (601), receiving element (602), judging unit (603) and scheduling unit (604), wherein
Described judging unit (603) is used to judge whether relay station has will send to this signal of base station;
Scheduling unit (604) is dispatched receiving element (602) according to the judged result of judging unit (603), thereby have to send to this signal of base station the time at described relay station, make described receiving element (602) receive described signal during as one or more uplink sub-frames beyond the uplink sub-frames of the reception feedback of the data relay uplink subframe, that transmit on being used to transmit at absolute descending access link subframe from described relay station, and
Described scheduling unit is also dispatched travelling carriage and relay station, thereby described travelling carriage does not send data to described relay station during described relay uplink subframe.
2. base station according to claim 1 is characterized in that,
Described judging unit (603) is used to judge whether described base station has the signal that will send to described relay station;
Scheduling unit (604) is dispatched transmitting element (601) according to the judged result of judging unit (603), thereby when the signal that will send to described relay station being arranged in described base station, make described transmitting element as the downlink relay link subframe, its receive feedback with the corresponding subframe of this relay uplink subframe on send described signal to described relay station during one or more downlink subframe of transmitting
Described scheduling unit is notified described travelling carriage: this downlink subframe as described downlink relay link subframe is the broadcast multi-broadcasting Single frequency network subframe, and
Described scheduling unit is dispatched described relay station, thereby described relay station does not send data to travelling carriage during described downlink relay link subframe.
3. base station according to claim 1 is characterized in that, described relay station will send to the receiving feedback signals that described signal of base station comprises the data-signal that will send to described base station and need send to described base station.
4. base station according to claim 2 is characterized in that, the signal that described base station will send to described relay station comprises data-signal that will send to described relay station and the receiving feedback signals that need send to described relay station.
5. base station according to claim 1 is characterized in that described scheduling unit is also dispatched, thereby
Have will send to this signal of base station the time at described relay station, make described receiving element (602) in as the downlink subframe outside absolute descending access link subframe specific sub-frame, described, receive described signal from this relay station, and
Described scheduling unit is notified described relay station: in the downlink subframe corresponding, send described signal with described specific sub-frame,
Described scheduling unit is notified described mobile radio station: the downlink subframe corresponding with described specific sub-frame is the broadcast multi-broadcasting Single frequency network subframe.
6. base station according to claim 5 is characterized in that, comprises in the described specific sub-frame that described base station sends the period of signal to described travelling carriage.
7. base station according to claim 6 is characterized in that, comprises in the described specific sub-frame being used to make described base station to be converted to the conversion period of accepting state and/or to make described base station be converted to the conversion period of transmit status from accepting state from transmit status.
8. base station according to claim 6 is characterized in that described base station also comprises regulon, and described regulon is used to regulate the duration that base station described in the described specific sub-frame is in accepting state.
9. base station according to claim 7 is characterized in that, described regulon is also regulated and made described base station be converted to the conversion period of accepting state and/or make described base station be converted to the duration of the conversion period of transmit status from accepting state from transmit status.
10. base station, this base station comprises transmitting element (601), receiving element (602), judging unit (603) and scheduling unit (604), wherein
Described judging unit (603) is used to judge whether relay station has will send to described signal of base station;
Scheduling unit (604) is dispatched receiving element (602) according to the judged result of judging unit (603), thereby in as the downlink subframe outside absolute descending access link subframe specific sub-frame, described, receive described signal from this relay station, and
Described scheduling unit is notified described relay station: in the downlink subframe corresponding, send described signal with described specific sub-frame,
Described scheduling unit is notified mobile radio station: the downlink subframe corresponding with described specific sub-frame is the broadcast multi-broadcasting Single frequency network subframe.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910008197 CN101835194B (en) | 2009-03-13 | 2009-03-13 | Base station |
| PCT/CN2010/070953 WO2010102564A1 (en) | 2009-03-13 | 2010-03-10 | Base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910008197 CN101835194B (en) | 2009-03-13 | 2009-03-13 | Base station |
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| CN101835194A true CN101835194A (en) | 2010-09-15 |
| CN101835194B CN101835194B (en) | 2013-01-23 |
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| WO (1) | WO2010102564A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014086245A1 (en) * | 2012-12-07 | 2014-06-12 | Huawei Technologies Co., Ltd. | Systems and methods for packet relaying |
| CN107612717A (en) * | 2017-08-28 | 2018-01-19 | 深圳市盛路物联通讯技术有限公司 | relay automatic routing method and gateway |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141171B (en) * | 2006-09-08 | 2011-07-06 | 华为技术有限公司 | Radio communication device, system and method |
| CN101166055B (en) * | 2006-10-18 | 2011-06-01 | 华为技术有限公司 | Multi-hop relay method and multi-hop relay system |
| KR100972957B1 (en) * | 2007-01-08 | 2010-07-29 | 삼성전자주식회사 | Apparatus and method for frame information transmitting in multi-hop relay broadband wireless access communication system |
-
2009
- 2009-03-13 CN CN 200910008197 patent/CN101835194B/en not_active Expired - Fee Related
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2010
- 2010-03-10 WO PCT/CN2010/070953 patent/WO2010102564A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014086245A1 (en) * | 2012-12-07 | 2014-06-12 | Huawei Technologies Co., Ltd. | Systems and methods for packet relaying |
| US10091688B2 (en) | 2012-12-07 | 2018-10-02 | Futurewei Technologies, Inc. | Systems and methods for packet relaying |
| CN107612717A (en) * | 2017-08-28 | 2018-01-19 | 深圳市盛路物联通讯技术有限公司 | relay automatic routing method and gateway |
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| Publication number | Publication date |
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| WO2010102564A1 (en) | 2010-09-16 |
| CN101835194B (en) | 2013-01-23 |
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