CN104837195A - Air interface synchronous method and apparatus, and base station - Google Patents
Air interface synchronous method and apparatus, and base station Download PDFInfo
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- CN104837195A CN104837195A CN201410046345.0A CN201410046345A CN104837195A CN 104837195 A CN104837195 A CN 104837195A CN 201410046345 A CN201410046345 A CN 201410046345A CN 104837195 A CN104837195 A CN 104837195A
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Abstract
The invention provides an air interface synchronous method and apparatus, and a base station. The method comprises: configuring an assigned uplink and downlink ratio to the base station; receiving a physical downlink control channel emitted by a source base station or an enhanced physical downlink control channel used for indicating an uplink and downlink ratio used when the source base station converts an uplink and downlink ratio; and receiving a reference signal on a subframe converting an uplink subframe into a downlink subframe from the source base station, and synchronizing to a source cell according to the reference signal. According to the invention, a TDD-LTE system can realize network interception, reduce system overhead possibly caused by certain configuration operation, and reduce (or eliminate) interference of base station emission signals to adjacent cells when the uplink and downlink ratio is zero.
Description
Technical field
The present invention relates between advanced Long Term Evolution (hereinafter referred to as LTE-A) base stations in mobile communication system and carry out the time (or/and frequency) synchronous method, particularly relate to a kind of method and apparatus of air interface synchronization, base station.
Background technology
According to the agreement TS36.211-b50(Physical Channels and Modulation of 3G (Third Generation) Moblie partner program (hereinafter referred to as 3GPP), physical channel and modulation) the 4th chapter (Frame structure, frame structure), LTE-A(and LTE) comprise 2 kinds of frame structures: Class1 frame structure and type 2 frame structure.Wherein, Class1 frame structure is exactly Frequency Division Duplexing (FDD) (hereinafter referred to as FDD) frame structure, and type 2 frame structure is exactly time division duplex (hereinafter referred to as TDD) frame structure.Use the system of FDD frame structure to be referred to as LTE-FDD system, use the system of tdd frame structure to be referred to as TDD-LTE system (or LTE-TDD system).In LTE system, (comprise FDD and TDD), the time span of a radio frames is 10 milliseconds.A radio frames is divided into 10 subframes equably, and the time span of each subframe is one millisecond, each subframe by the time sequencing that subframe is launched be labeled as subframe 0, subframe 1, subframe 2 ..., subframe 8, subframe 9.
In TDD-LTE system, some subframes are used for base station transmit signals and subscriber equipment (hereinafter referred to as UE) receives the signal of Base Transmitter, and such subframe is called descending sub frame (be labeled as D, or D subframe).In TDD-LTE system, some subframes are used for transmitting to UE and base station receives the signal that UE launches, and such subframe is called sub-frame of uplink (be labeled as U, or U subframe).In TDD-LTE system, also has a kind of subframe (be labeled as S, or S subframe) being called special subframe.Because special subframe and relation of the present invention are little, just do not describe here.
In TDD-LTE system, above-mentioned 3 kinds of subframes have 7 kinds of combinations (up-downgoing proportioning 0 is to up-downgoing proportioning 6) at present, as shown in Table 1 below.Base station, when using a certain up-downgoing proportioning, can use the mode of broadcast to tell UE by Class1 system information block (hereinafter referred to as SIB1).Base station changes over another kind of up-downgoing proportioning from a certain up-downgoing proportioning needs long time (such as, hundreds of millisecond).
Table 1
In LTE-FDD system, do not need synchronous between base station.Certainly, synchronously better systematic function can be obtained afterwards between base station.In TDD-LTE system, must synchronous (whole net be synchronous) between base station, up to descending interference and descending to up interference to avoid.Carry out between the base stations in synchronous process, provide the base station of synchronizing information (signal, channel) to be called source base station or cell-of-origin, the base station receiving synchronizing information is called target BS or Target cell.In order to make between TDD-LTE base station can synchronously on, satellite navigation system (e.g., Beidou satellite navigation system, global positioning system (GPS) etc.) can be used, also can use IEEE (hereinafter referred to as IEEE) 1588V2 technology.
In some cases, satellite-signal (e.g., indoor, basement, tunnel etc.) may be there is no, thus satellite navigation system can not be used synchronous to what do between base station.In some cases, interface (abbreviation X2 interface) between the base station that good transmission quality may not be provided, interface between the base station of good transmission quality and core net (being called for short S1 interface) also may not be provided, thus IEEE1588V2 technology can not be used.
For overcoming above-mentioned restriction, 3GPP proposes the technology of network intercepting, as shown in Figure 1.In the 6.4.2 trifle of the technical report TR36.922-b00 of 3GPP, this report gives the method for 2 kinds of network intercepting: a kind of scheme is, Target cell is the synchronizing information (signal, channel) that broadcast multi-broadcasting Single frequency network subframe (hereinafter referred to as MBSFN sub-frame) intercepts cell-of-origin by certain (some) descending sub frame of configuration oneself, thus synchronous with cell-of-origin upper (program is referred to as " MBSFN sub-frame scheme "); Another kind of scheme uses the protection interval of special subframe.
In MBSFN sub-frame scheme, Target cell needs certain (some) descending sub frame configuring oneself to be MBSFN sub-frame.But in the up-downgoing proportioning 0 of TDD-LTE system, can not configure MBSFN sub-frame, agreement specifies that subframe 0,1,5,6 subframe of TDD can not configure MBSFN sub-frame.Therefore, MBSFN sub-frame scheme cannot use in the up-downgoing proportioning 0 of TDD-LTE system.In MBSFN sub-frame scheme, MBSFN sub-frame adds the expense (can not serve the UE of oneself in this MBSFN sub-frame) of Target cell.
According to Section 6.7 of 3GPP agreement TS36.211-b50, in the MBSFN subframe, one or 2 symbols need to transmit up front in base station.Base station is transmit can not Received signal strength on the same frequencies, otherwise what receive is all oneself the signal sent out.The signal of Base Transmitter may disturb adjacent community.Meeting progress (e.g., the 3GPP RAN1#75 meeting nearest according to 3GPP; Can consult " Draft_Minutes_report_RAN1#75_v010.doc "), 3GPP (as R12 version) may introduce the interference management and service adaptation (hereinafter referred to as eIMTA) this technology that strengthen in the agreement in future.
In eIMTA technology, Physical Downlink Control Channel (hereinafter referred to as PDCCH) can be passed through in base station or the Physical Downlink Control Channel (hereinafter referred to as EPDCCH) that strengthens tells that the up-downgoing proportioning that (or a group, a group can comprise all UE) tells UE current wireless frame or next radio frames is any.If above-mentioned PDCCH/EPDCCH is not launched in base station, then the up-downgoing proportioning of this base station is provided by SIB1.The effective time providing up-downgoing proportioning above by PDCCH/EPDCCH is a radio frames (10 milliseconds).The kind providing up-downgoing proportioning above by PDCCH/EPDCCH is conditional.Such as, if providing up-downgoing proportioning by SIB1 is 0, the up-downgoing proportioning so provided by PDCCH/EPDCCH can be 1, but can not be 3.Supposing that certain base station provides up-downgoing proportioning by SIB1 is 0, and the up-downgoing proportioning provided by PDCCH/EPDCCH is 1, and so subframe 4 and subframe 8 become D subframe from U subframe.
Therefore, TDD-LTE system can not realize network intercepting when up-downgoing proportioning 0, some configuration operation may increase overhead, strengthen base station transmit signals to the interference of neighbor cell.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and apparatus, base station of air interface synchronization, with realize TDD-LTE system when up-downgoing proportioning 0 can network intercepting, reduce overhead, reduce base station transmit signals to the interference of neighbor cell.
In order to solve the problems of the technologies described above, the invention provides a kind of method of air interface synchronization, comprising:
Base station configures the up-downgoing proportioning of specifying;
Described base station receives the Physical Downlink Control Channel of source base station transmitting or the Physical Downlink Control Channel of enhancing, and the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the up-downgoing proportioning used after described source base station changes up-downgoing proportioning;
The subframe that described base station becomes descending sub frame from described source base station by sub-frame of uplink receives reference signal, is synchronized to described cell-of-origin according to described reference signal.
Further, said method also has feature below: described base station comprises after receiving the Physical Downlink Control Channel of source base station transmitting or the Physical Downlink Control Channel of enhancing:
Described base station obtains according to the Physical Downlink Control Channel of described Physical Downlink Control Channel or enhancing described source base station to be become descending sub frame sub-frame information by sub-frame of uplink.
Further, said method also has feature below: described base station obtains described source base station is become descending sub frame sub-frame information by sub-frame of uplink, comprising:
Described base station obtains by blind check or by the interface between described source base station described source base station to be become descending sub frame sub-frame information by sub-frame of uplink.
Further, said method also has feature below: described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
In order to solve the problem, present invention also offers a kind of method of air interface synchronization, comprising:
Base station configures the up-downgoing proportioning of specifying;
Described base station receives source base station at the Physical Downlink Control Channel being become Physical Downlink Control Channel or the enhancing that the subframe of descending sub frame is launched by sub-frame of uplink after transformation up-downgoing proportioning, and the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the special random access guiding number of Target cell use;
Special Stochastic accessing is initiated according to described special random access guiding number in described base station, is synchronized to described cell-of-origin according to the accidental access response received.
Further, said method also has feature below: described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
In order to solve the problem, present invention also offers a kind of device of air interface synchronization, being applied to base station, wherein, comprising:
Configuration module, for configuring the up-downgoing proportioning of specifying;
Receiver module, for receiving the Physical Downlink Control Channel or the Physical Downlink Control Channel of enhancing that source base station launches, the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the up-downgoing proportioning used after described source base station changes up-downgoing proportioning;
Synchronization module, receives reference signal for the subframe becoming descending sub frame by sub-frame of uplink from described source base station, is synchronized to described cell-of-origin according to described reference signal.
Further, said apparatus also has feature below: described device also comprises:
Acquisition module, to be become the sub-frame information of descending sub frame by sub-frame of uplink for obtaining described source base station according to the Physical Downlink Control Channel of described Physical Downlink Control Channel or enhancing.
Further, said apparatus also has feature below: described acquisition module, is by blind check or obtains described source base station by the interface between described source base station and to be become the sub-frame information of descending sub frame by sub-frame of uplink.
Further, said apparatus also has feature below:
Described receiver module, also for receiving source base station at the Physical Downlink Control Channel being become Physical Downlink Control Channel or the enhancing that the subframe of descending sub frame is launched by sub-frame of uplink after transformation up-downgoing proportioning, the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the special random access guiding number of Target cell use;
Described synchronization module, also for initiating special Stochastic accessing according to described special random access guiding number, is synchronized to described cell-of-origin according to the accidental access response received.
Further, said apparatus also has feature below: described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
In order to solve the problem, present invention also offers a kind of base station, comprise the device of above-mentioned air interface synchronization.
To sum up, the invention provides a kind of method of air interface synchronization and device, base station, TDD-LTE system can be enable to realize network intercepting when up-downgoing proportioning 0, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals to the interference of neighbor cell.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the network intercepting of prior art.
Fig. 2 is the flow chart of the method for a kind of air interface synchronization of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the embodiment of the present invention one.
Fig. 4 is the schematic diagram of the embodiment of the present invention two.
Fig. 5 is the schematic diagram of the embodiment of the present invention three.
Fig. 6 is the schematic diagram of the embodiment of the present invention four.
Fig. 7 is the schematic diagram of the embodiment of the present invention five.
Fig. 8 is the schematic diagram of the embodiment of the present invention six.
Fig. 9 is the schematic diagram of the embodiment of the present invention seven.
Figure 10 is the schematic diagram of the device of a kind of air interface synchronization of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
The technical problem to be solved in the present invention be enable TDD-LTE system realize network intercepting when up-downgoing proportioning 0, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.Other up-downgoing proportionings of TDD-LTE system also can use this technology, such as up-downgoing proportioning 1,3,4,6.
Fig. 2 is the flow chart of the method for a kind of air interface synchronization of the embodiment of the present invention, as shown in Figure 2, comprises the steps.
Step 11: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.
Step 12: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.
In above-mentioned steps 12, cell-of-origin is after being transformed into new up-downgoing proportioning, the subframe being become D subframe by U subframe can also launch PDCCH/EPDCCH, initiate special Stochastic accessing with which special random access guiding number of indicating target community.
Step 13: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 14: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames, knows that source base station becomes the sub-frame information of descending sub frame by sub-frame of uplink.
Like this, Target cell just can know which U subframe becomes D subframe.Such as, the proportioning of (by SIB1) system broadcasts is 0, but is 1 by the proportioning that PDCCH/EPDCCH dynamically indicates, and so subframe 5 and 9 just becomes D subframe, and is no longer U subframe.Target cell just can receive reference signal/data after knowing and being D subframe on this subframe.
In this above-mentioned steps 14, also comprise the special random access guiding number that Target cell indicates according to above-mentioned PDCCH/EPDCCH and initiate special Stochastic accessing.
Step 15: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.
In above-mentioned steps 15, the sub-frame information of transmitted reference signal can also be transmitted by the interface between base station.
Step 16: Target cell receives above-mentioned reference signal or/and receive cell-of-origin in above-mentioned subframe or other subframes to be transmitted to its accidental access response from the above-mentioned subframe of cell-of-origin.
Step 17: Target cell according to the above-mentioned reference signal received or/and above-mentioned accidental access response is synchronized to cell-of-origin.
Step 18: flow process terminates.
Visible, the method that the embodiment of the present invention proposes TDD-LTE system can be enable to realize network intercepting when up-downgoing proportioning 0 and other up-downgoing proportionings or carry out Network Synchronization according to special Stochastic accessing, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Below the preferred embodiment of technical scheme of the present invention is described in further detail.
Embodiment one
This embodiment makes up-downgoing proportioning 1(as shown in Figure 3 by launching PDCCH/EPDCCH the up-downgoing proportioning 0 of oneself with up-downgoing proportioning 0, cell-of-origin), suppose cell-of-origin subframe 0 launch revise up-downgoing proportioning PDCCH/EPDCCH(namely, come into force at current wireless frame after amendment), subframe 4 transmitted reference signal of cell-of-origin after up-downgoing proportioning makes up-downgoing proportioning 1 into be that example is illustrated.
Step 101: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.According to hypothesis above, in the present embodiment, Target cell and cell-of-origin are all configured to up-downgoing proportioning 0.
Step 102: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 1 at current wireless frame.
Step 103: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 104: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 1 at current wireless frame.
Step 105: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.According to hypothesis above, in the present embodiment, cell-of-origin is transmitted reference signal in the subframe 4 of current wireless frame.
Step 106: Target cell receives above-mentioned reference signal from the above-mentioned subframe of cell-of-origin.According to hypothesis above, in the present embodiment, Target cell is the reference signal receiving cell-of-origin in the subframe 4 of current wireless frame.
Step 107: Target cell is synchronized to cell-of-origin according to the above-mentioned reference signal received.
Step 108: flow process terminates.
Visible, the method for the proposition of the embodiment of the present invention can enable TDD-LTE system realize network intercepting when up-downgoing proportioning 0, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Embodiment two:
This embodiment makes up-downgoing proportioning 2(as shown in Figure 4 by launching PDCCH/EPDCCH the up-downgoing proportioning of oneself with up-downgoing proportioning 1, cell-of-origin), suppose cell-of-origin subframe 0 launch revise up-downgoing proportioning PDCCH/EPDCCH(namely, come into force at current wireless frame after amendment), subframe 8 transmitted reference signal of cell-of-origin after up-downgoing proportioning makes up-downgoing proportioning 2 into be that example is illustrated.
Step 201: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.According to hypothesis above, in the present embodiment, Target cell and cell-of-origin are all configured to up-downgoing proportioning 1.
Step 202: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 2 at current wireless frame.
Step 203: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 204: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 2 at current wireless frame.
Step 205: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.According to hypothesis above, in the present embodiment, cell-of-origin is transmitted reference signal in the subframe 8 of current wireless frame.
Step 206: Target cell receives above-mentioned reference signal from the above-mentioned subframe of cell-of-origin.According to hypothesis above, in the present embodiment, Target cell is the reference signal receiving cell-of-origin in the subframe 8 of current wireless frame.
Step 207: Target cell is synchronized to cell-of-origin according to the above-mentioned reference signal received.
Step 208: flow process terminates.
Visible, the method for the proposition of the embodiment of the present invention can enable TDD-LTE system realize network intercepting when up-downgoing proportioning 0, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Embodiment three:
This embodiment makes up-downgoing proportioning 4(as shown in Figure 5 by launching PDCCH/EPDCCH the up-downgoing proportioning of oneself with up-downgoing proportioning 3, cell-of-origin), suppose cell-of-origin subframe 5 launch revise up-downgoing proportioning PDCCH/EPDCCH(namely, come into force in next radio frames after amendment), subframe 4 transmitted reference signal of cell-of-origin after up-downgoing proportioning makes up-downgoing proportioning 4 into be that example is illustrated.
Step 301: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.According to hypothesis above, in the present embodiment, Target cell and cell-of-origin are all configured to up-downgoing proportioning 3.
Step 302: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 4 in next radio frames.
Step 303: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 304: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 4 in next radio frames.
Step 305: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.According to hypothesis above, in the present embodiment, cell-of-origin is transmitted reference signal in the subframe 4 of next radio frames.
Step 306: Target cell receives above-mentioned reference signal from the above-mentioned subframe of cell-of-origin.According to hypothesis above, in the present embodiment, Target cell is the reference signal receiving cell-of-origin in the subframe 4 of next radio frames.
Step 307: Target cell is synchronized to cell-of-origin according to the above-mentioned reference signal received.
Step 308: flow process terminates.
Visible, the method that the embodiment of the present invention proposes can enable TDD-LTE system realize network intercepting when up-downgoing proportioning 3, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Embodiment four:
This embodiment makes up-downgoing proportioning 5(as shown in Figure 6 by launching PDCCH/EPDCCH the up-downgoing proportioning of oneself with up-downgoing proportioning 3, cell-of-origin), suppose cell-of-origin subframe 5 launch revise up-downgoing proportioning PDCCH/EPDCCH(namely, come into force in next radio frames after amendment), subframe 3 transmitted reference signal of cell-of-origin after up-downgoing proportioning makes up-downgoing proportioning 5 into be that example is illustrated.
Step 401: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.According to hypothesis above, in the present embodiment, Target cell and cell-of-origin are all configured to up-downgoing proportioning 3.
Step 402: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 5 in next radio frames.
Step 403: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 404: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 5 in next radio frames.
Step 405: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.According to hypothesis above, in the present embodiment, cell-of-origin is transmitted reference signal in the subframe 3 of next radio frames.
Step 406: Target cell receives above-mentioned reference signal from the above-mentioned subframe of cell-of-origin.According to hypothesis above, in the present embodiment, Target cell is the reference signal receiving cell-of-origin in the subframe 3 of next radio frames.
Step 407: Target cell is synchronized to cell-of-origin according to the above-mentioned reference signal received.
Step 408: flow process terminates.
Visible, the method that the embodiment of the present invention proposes can enable TDD-LTE system realize network intercepting when up-downgoing proportioning 3, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Embodiment five:
This embodiment with the up-downgoing proportioning of cell-of-origin be 1, the up-downgoing proportioning of Target cell is 0, cell-of-origin makes up-downgoing proportioning 2(into as shown in Figure 7 by launching PDCCH/EPDCCH the up-downgoing proportioning of oneself), suppose cell-of-origin subframe 0 launch revise up-downgoing proportioning PDCCH/EPDCCH(namely, come into force at current wireless frame after amendment), subframe 3 transmitted reference signal of cell-of-origin after up-downgoing proportioning makes up-downgoing proportioning 2 into be that example is illustrated.
Step 501: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.According to hypothesis above, in the present embodiment, Target cell is configured to up-downgoing proportioning 0, but cell-of-origin is configured to the different up-downgoing proportioning of up-downgoing proportioning 1().
Step 502: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 2 at current wireless frame.
Step 503: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 504: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 2 at current wireless frame.
Step 505: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.According to hypothesis above, in the present embodiment, cell-of-origin is transmitted reference signal in the subframe 3 of current wireless frame.
Step 506: Target cell receives above-mentioned reference signal from the above-mentioned subframe of cell-of-origin.According to hypothesis above, in the present embodiment, Target cell is the reference signal receiving cell-of-origin in the subframe 3 of current wireless frame.
Step 507: Target cell is synchronized to cell-of-origin according to the above-mentioned reference signal received.
Step 508: flow process terminates.
Visible, the method that the embodiment of the present invention proposes can enable TDD-LTE system realize network intercepting when up-downgoing proportioning 0, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Embodiment six:
This embodiment makes up-downgoing proportioning 1(as shown in Figure 8 by launching PDCCH/EPDCCH the up-downgoing proportioning of oneself with up-downgoing proportioning 0, cell-of-origin), suppose that the PDCCH/EPDCCH(of amendment up-downgoing proportioning is launched in subframe 0 in cell-of-origin namely, come into force at current wireless frame after amendment), the subframe 4 of cell-of-origin after up-downgoing proportioning makes up-downgoing proportioning 1 into be that example is illustrated to Target cell transmitting with the PDCCH/EPDCCH of special random access preamble number.
Step 601: Target cell and cell-of-origin are configured to identical or different up-downgoing proportioning.According to hypothesis above, in the present embodiment, Target cell and cell-of-origin are all configured to up-downgoing proportioning 0.
Step 602: PDCCH/EPDCCH is launched in cell-of-origin, uses any up-downgoing proportioning to indicate current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 1 at current wireless frame.
In this above-mentioned steps 602, cell-of-origin is after being transformed into new up-downgoing proportioning, the subframe being become D subframe by U subframe can also launch PDCCH/EPDCCH, initiate special Stochastic accessing with which special random access guiding number of indicating target community.According to hypothesis above, the present embodiment has been supposed to perform by a kind of this method.
Step 603: Target cell receives and the above-mentioned PDCCH/EPDCCH that decodes.
Step 604: Target cell is derived cell-of-origin according to above-mentioned PDCCH/EPDCCH and used any up-downgoing proportioning at current wireless frame or next radio frames.According to hypothesis above, in the present embodiment, cell-of-origin uses up-downgoing proportioning 1 at current wireless frame.
In this above-mentioned steps 604, also comprise Target cell and initiate special Stochastic accessing according to above-mentioned PDCCH/EPDCCH.According to hypothesis above, the present embodiment has been supposed to perform by a kind of this method.
Step 605: transmitted reference signal in one or more subframes being become D subframe by U subframe of cell-of-origin in above-mentioned radio frames.According to hypothesis above, in the present embodiment, cell-of-origin is transmitted reference signal in the subframe 4 of current wireless frame.
In this above-mentioned steps 605, the sub-frame information of transmitted reference signal can also be transmitted by the interface between base station.In the present embodiment, Target cell can be known " sub-frame information of transmitted reference signal " by the above-mentioned PDCCH/EPDCCH of blind check, also can be known " sub-frame information of transmitted reference signal " by the interface between base station.
As shown in Figure 9, if bit corresponding to certain radio frames is " 1 ", then cell-of-origin will make a certain different proportioning into this radio frames.In fig. 8, radio frames X=0 or X=512(Fig. 7 is equivalent to the cycle of 1024 radio frames for example; " if the sub-frame information of transmitted reference signal " with 512 radio frames for the cycle, so, X=0; Radio frame number can snap to the System Frame Number (SFN) in LTE system).
Step 606: Target cell receives above-mentioned reference signal or/and receive cell-of-origin in above-mentioned subframe or other subframes to be transmitted to its accidental access response from the above-mentioned subframe of cell-of-origin.According to hypothesis above, in the present embodiment, Target cell receives cell-of-origin and is transmitted to its accidental access response in above-mentioned subframe or other subframes.
Step 607: Target cell according to the above-mentioned reference signal received or/and above-mentioned accidental access response is synchronized to cell-of-origin.According to hypothesis above, in the present embodiment, Target cell is synchronized to cell-of-origin according to above-mentioned accidental access response.
Step 608: flow process terminates.
Visible, the method that the embodiment of the present invention proposes can enable TDD-LTE system realize network intercepting when up-downgoing proportioning 0 according to special Stochastic accessing, reduce overhead that some configuration operation may cause, reduction (or elimination) base station transmit signals is to the interference of neighbor cell.
Figure 10 is the schematic diagram of the device of a kind of air interface synchronization of the embodiment of the present invention, and as shown in Figure 10, the device of the present embodiment can comprise:
Configuration module, for configuring the up-downgoing proportioning of specifying;
Receiver module, for receiving the Physical Downlink Control Channel or the Physical Downlink Control Channel of enhancing that source base station launches, the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the up-downgoing proportioning used after described source base station changes up-downgoing proportioning;
Synchronization module, receives reference signal for the subframe becoming descending sub frame by sub-frame of uplink from described source base station, is synchronized to described cell-of-origin according to described reference signal.
In a preferred embodiment, described device can also comprise:
Acquisition module, to be become the sub-frame information of descending sub frame by sub-frame of uplink for obtaining described source base station according to the Physical Downlink Control Channel of described Physical Downlink Control Channel or enhancing.
In a preferred embodiment, described acquisition module is by blind check or obtain described source base station by the interface between described source base station and to be become the sub-frame information of descending sub frame by sub-frame of uplink.
In a preferred embodiment, described receiver module, can also for receiving source base station at the Physical Downlink Control Channel being become Physical Downlink Control Channel or the enhancing that the subframe of descending sub frame is launched by sub-frame of uplink after transformation up-downgoing proportioning, the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the special random access guiding number of Target cell use;
Described synchronization module, can also be used for initiating special Stochastic accessing according to described special random access guiding number, be synchronized to described cell-of-origin according to the accidental access response received.
Wherein, described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
The embodiment of the present invention also provides a kind of base station, comprises the device of above-mentioned air interface synchronization.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
These are only the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (12)
1. a method for air interface synchronization, comprising:
Base station configures the up-downgoing proportioning of specifying;
Described base station receives the Physical Downlink Control Channel of source base station transmitting or the Physical Downlink Control Channel of enhancing, and the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the up-downgoing proportioning used after described source base station changes up-downgoing proportioning;
The subframe that described base station becomes descending sub frame from described source base station by sub-frame of uplink receives reference signal, is synchronized to described cell-of-origin according to described reference signal.
2. the method for claim 1, is characterized in that: described base station comprises after receiving the Physical Downlink Control Channel of source base station transmitting or the Physical Downlink Control Channel of enhancing:
Described base station obtains according to the Physical Downlink Control Channel of described Physical Downlink Control Channel or enhancing described source base station to be become descending sub frame sub-frame information by sub-frame of uplink.
3. method as claimed in claim 2, is characterized in that: described base station obtains described source base station is become descending sub frame sub-frame information by sub-frame of uplink, comprising:
Described base station obtains by blind check or by the interface between described source base station described source base station to be become descending sub frame sub-frame information by sub-frame of uplink.
4. the method as described in any one of claim 1-3, is characterized in that: described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
5. a method for air interface synchronization, comprising:
Base station configures the up-downgoing proportioning of specifying;
Described base station receives source base station at the Physical Downlink Control Channel being become Physical Downlink Control Channel or the enhancing that the subframe of descending sub frame is launched by sub-frame of uplink after transformation up-downgoing proportioning, and the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the special random access guiding number of Target cell use;
Special Stochastic accessing is initiated according to described special random access guiding number in described base station, is synchronized to described cell-of-origin according to the accidental access response received.
6. method as claimed in claim 5, is characterized in that: described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
7. a device for air interface synchronization, is applied to base station, it is characterized in that, comprising:
Configuration module, for configuring the up-downgoing proportioning of specifying;
Receiver module, for receiving the Physical Downlink Control Channel or the Physical Downlink Control Channel of enhancing that source base station launches, the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the up-downgoing proportioning used after described source base station changes up-downgoing proportioning;
Synchronization module, receives reference signal for the subframe becoming descending sub frame by sub-frame of uplink from described source base station, is synchronized to described cell-of-origin according to described reference signal.
8. device as claimed in claim 7, is characterized in that: described device also comprises:
Acquisition module, to be become the sub-frame information of descending sub frame by sub-frame of uplink for obtaining described source base station according to the Physical Downlink Control Channel of described Physical Downlink Control Channel or enhancing.
9. device as claimed in claim 8, is characterized in that:
Described acquisition module is by blind check or obtain described source base station by the interface between described source base station and to be become the sub-frame information of descending sub frame by sub-frame of uplink.
10. device as claimed in claim 7, is characterized in that:
Described receiver module, also for receiving source base station at the Physical Downlink Control Channel being become Physical Downlink Control Channel or the enhancing that the subframe of descending sub frame is launched by sub-frame of uplink after transformation up-downgoing proportioning, the Physical Downlink Control Channel of this Physical Downlink Control Channel or enhancing is used to indicate the special random access guiding number of Target cell use;
Described synchronization module, also for initiating special Stochastic accessing according to described special random access guiding number, is synchronized to described cell-of-origin according to the accidental access response received.
11. devices as described in any one of claim 7-10, is characterized in that: described up-downgoing proportioning of specifying comprises following any one:
Up-downgoing proportioning 0,1,3,4,6.
12. 1 kinds of base stations, is characterized in that, comprise the device as described in any one of claim 7-11.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410046345.0A CN104837195A (en) | 2014-02-10 | 2014-02-10 | Air interface synchronous method and apparatus, and base station |
| PCT/CN2014/086096 WO2015117300A1 (en) | 2014-02-10 | 2014-09-09 | Air interface synchronization method and device, and base station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410046345.0A CN104837195A (en) | 2014-02-10 | 2014-02-10 | Air interface synchronous method and apparatus, and base station |
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| CN201410046345.0A Withdrawn CN104837195A (en) | 2014-02-10 | 2014-02-10 | Air interface synchronous method and apparatus, and base station |
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| WO (1) | WO2015117300A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101981994A (en) * | 2008-02-08 | 2011-02-23 | Zte(美国)公司 | Dynamic adjustment of downlink/uplink allocation ratio in TDD wireless systems |
| US20110310987A1 (en) * | 2010-06-16 | 2011-12-22 | Samsung Electronics Co., Ltd. | Uplink power control method for mobile communication system |
| CN103024905A (en) * | 2011-01-07 | 2013-04-03 | 华为技术有限公司 | Subframe proportioning method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427962A (en) * | 2012-05-18 | 2013-12-04 | 北京三星通信技术研究有限公司 | HARQ feedback method of downlink data |
| CN102761956B (en) * | 2012-06-29 | 2015-11-25 | 华为技术有限公司 | Network intercepting synchronous method, device and base station |
-
2014
- 2014-02-10 CN CN201410046345.0A patent/CN104837195A/en not_active Withdrawn
- 2014-09-09 WO PCT/CN2014/086096 patent/WO2015117300A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101981994A (en) * | 2008-02-08 | 2011-02-23 | Zte(美国)公司 | Dynamic adjustment of downlink/uplink allocation ratio in TDD wireless systems |
| US20110310987A1 (en) * | 2010-06-16 | 2011-12-22 | Samsung Electronics Co., Ltd. | Uplink power control method for mobile communication system |
| CN103024905A (en) * | 2011-01-07 | 2013-04-03 | 华为技术有限公司 | Subframe proportioning method and device |
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| QUALCOMM INCORPORATED: "《3GPP TSG-RAN WG1 #73 R1-132495 Network Synchronization by Network Listening》", 24 May 2013 * |
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| WO2015117300A1 (en) | 2015-08-13 |
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Application publication date: 20150812 |