CN102547968A - Coordinated multiple-point transmission downlink synchronization method and device - Google Patents
Coordinated multiple-point transmission downlink synchronization method and device Download PDFInfo
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Abstract
The invention discloses a coordinated multiple-point transmission downlink synchronization method and a device. The method comprises the following steps, receiving and saving information about a plurality of selectable transmission points notified by a base station; determining a transmission point set according to the notification of the base station (the transmission point set consists of at least one transmission point selected from the transmission points by the base station); respectively determining the downlink timing moment of each transmission point in the transmission point set according to the information of the transmission points in the transmission point set; and setting downlink timing slip ttiming-offset according to the earliest downlink timing moment of the transmission points in the transmission point set and the downlink timing moment of a serving cell, and determining the starting time of a downlink receiving window according to the ttiming-offset. The method and the device solve the problem of interferences among signs caused by synchronously timing differences of a plurality of transmission points is solved, and the transmission quality of multi-point coordinated transmission is improved.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of cooperative multipoint transmission down link synchronisation method and device.
Background technology
LTE (Long Term Evolution, Long Term Evolution) system descending adopts OFDM (Orthogonal Frequency Division Multiplexing, OFDM) transmission plan.OFDM is very responsive to timing error.When the occurrence timing error, the signal of adjacent OFDM symbol possibly get into the receiver window of current OFDM symbol, produces intersymbol interference, thereby destroys the orthogonality between subcarrier.
In the LTE system; User's Serving cell transmits PSS (Primary Synchronous Signal simultaneously in Frame; Master sync signal)/SSS (Secondary Synchronous Signal, auxiliary synchronous signals) and CRS (Cell Reference Signal, cell reference signals).The receiving terminal of UE utilizes the time of reception of the local Sequence Detection downlink data frame of PSS/SSS and/or CRS, thereby obtains the descending timing of subscriber signal.
The detection of downlink data frame time of reception realizes through the method for related operation with the search relevant peaks usually.For example: the signal of establishing the UE reception is y (t), and the local signal of synchronizing signal and/or reference signal is x (t), receives signal y (t) and carries out related operation with local signal x (t):
Wherein, Δ t is a set point, t
1And t
2Be respectively the initial moment and the finish time of descending receiver window.
The moment that surpasses the maximum related value appearance of certain thresholding through search; Can confirm the time of reception of synchronizing signal and/or reference signal; Again according to synchronizing signal and/or the position of reference signal in Frame; Can confirm the time of reception of downlink data frame, thereby obtain to receive the down-going synchronous of signal.
The cooperative multipoint transmission technology is the cooperation between a plurality of transmission points that separate on the geographical position.Usually, a plurality of transmission points are meant the base station of different districts, or a plurality of RRH of the base station of a sub-district and its control.The cooperative multipoint transmission technology can be divided into down collaboration transmission and up and unite reception.The down collaboration multicast communication mainly is divided into two kinds of transmission plans again: cooperative scheduling/precoding (Coordinated Scheduling/Coordinated Beamforming, CS/CB) and Combined Treatment (Joint Processing, JP).
Wherein the Combined Treatment scheme can be divided into again joint transmission (Joint Transmission, JT) with the dynamic transmission point selection (Dynamic Point Selection, DPS).Joint transmission is meant that a plurality of transmission points send data to UE simultaneously, thereby has strengthened user's received signal, improves user performance.As shown in Figure 1, identical signal is transmitted to a user simultaneously in three sub-districts on same asset, and the user receives the signal mutual superposition of three sub-districts, has both strengthened user's reception signal, has avoided the interference of minizone again.The dynamic transmission point selection is meant that dynamic switching user transmits a little, always from cooperation transmission point, selects the optimum some transmission user signal to the user.As shown in Figure 2, the user selects different transmission points to send signal to the user based on each transmission point signal strength signal intensity in the different moment, always is in state preferably with the received signal quality that guarantees the user.
In the transmission of Combined Treatment multipoint cooperative, the different moment have one or more different transmission points and send useful signal to UE.If UE is still as in the unicast, transmit a little with certain, receive downstream signal synchronously like the descending timing of user's service point, then possibly cause intersymbol interference.Fig. 3 a, Fig. 3 b have provided user's signal of transmission point distribution situation and corresponding downstream signal reception condition.Shown in Fig. 3 a, in user's service point, transmission point 1 and transmission point 2, transmission point 1 is nearer to the distance of UE than user's service point with the UE distance, and transmission point 2 is more farther to the distance of UE than user's service point with the distance of UE.Therefore, when UE was descending timing reference constantly with the descending timing of service point, shown in Fig. 3 b, the signal of transmission point 1 arrived UE in advance, and the next OFDM symbol data of transmission point 1 can get into the current sign receiver window, thereby causes intersymbol interference.The signal delay of transmission point 2 arrives UE; A last OFDM symbol data of transmission point 2 gets into the time of reception scope of current sign (comprising CP); Owing to receive the protection of CP; If transmission point 2 signals surpass the length of CP at the delay time of reception of UE, the signal of transmission point 2 can not cause intersymbol interference.
It is thus clear that; If UE receives signal synchronously according to the descending timing of certain unicast; Then the useful signal of other transmission point transmission possibly produce intersymbol interference at the UE receiving terminal; Reduce the system transmissions performance, and for the descending timing that how to realize UE synchronously to overcome the intersymbol interference that cooperative multipoint transmission causes, concrete solution is not proposed at present as yet.
Summary of the invention
The present invention provides a kind of cooperative multipoint transmission down link synchronisation method and device, and the intersymbol interference problem of avoiding a plurality of transmission point synchronization timing difference to bring improves the transmission quality of multipoint cooperative transmission.
The present invention provides the cooperative multipoint transmission down link synchronisation method, comprising:
Receive the information and the preservation of a plurality of optional transmission point of base station notice;
Confirm the set of transmission point based on the notice of base station, at least one transmission point that said transmission point set is selected in optional transmission point by the base station is formed;
According to the information of transmission point in the said transmission point set, the descending timing moment of each transmission point in definite respectively said transmission point set;
According to the descending the earliest timing of transmission point in the transmission point set constantly and the descending timing of Serving cell constantly, descending timing slip t is set
Timing_offset, according to t
Timing_offsetConfirm the initial moment of descending receiver window.
The present invention also provides a kind of cooperative multipoint transmission down-going synchronous information notice method, comprising:
Information notifying user equipment UE with a plurality of optional transmission points;
In said a plurality of optional transmission points, select at least one transmission point and notice UE,, with the descending timing of Serving cell descending receiver window is set constantly constantly based on the descending the earliest timing of transmission point in the set of transmission point so that UE confirms the set of transmission point.
The present invention also provides a kind of cooperative multipoint transmission downlink synchronization device, comprising:
Information is preserved the unit, is used to receive the information of a plurality of optional transmission point of notifying the base station and preserve;
The unit is confirmed in set, is used for confirming the set of transmission point based on the notice of base station, and at least one transmission point that said transmission point set is selected in optional transmission point by the base station is formed;
The difference timing unit is used for the information based on transmission point in the said transmission point set, the descending timing moment of each transmission point in definite respectively said transmission point set;
Lock unit, be used for according to the descending the earliest timing of transmission point in the transmission point set constantly and the descending timing of Serving cell constantly, descending timing slip t is set
Timing_offset, according to t
Timing_offsetConfirm the initial moment of descending receiver window.
The present invention also provides a kind of cooperative multipoint transmission down-going synchronous information notification apparatus, comprising:
First notification unit is used for the information notifying user equipment UE with a plurality of optional transmission points;
Second notification unit; Be used for selecting at least one transmission point and notice UE at said a plurality of optional transmission points; So that UE confirms the set of transmission point, with the descending timing of Serving cell descending receiver window is set constantly constantly according to the descending the earliest timing of transmission point in the set of transmission point.
Utilize cooperative multipoint transmission down link synchronisation method provided by the invention and device, cooperative multipoint transmission down-going synchronous information notice method and device; Has following beneficial effect: through a relatively Serving cell and the descending timing of transmission point; Obtain timing offset; Thereby when being necessary the initial moment of current receiver window is adjusted to avoid intersymbol interference; Therefore, the intersymbol interference problem that the present invention can avoid a plurality of transmission point synchronization timing difference to bring improves the transmission quality of multipoint cooperative transmission.
Description of drawings
Fig. 1 is a joint transmission sketch map in the prior art;
Fig. 2 is a dynamic transmission point selection sketch map in the prior art;
Fig. 3 a transmits a distribution schematic diagram for the user;
Fig. 3 b is that downstream signal receives the sequential sketch map;
Fig. 4 is an embodiment of the invention cooperative multipoint transmission down link synchronisation method flow chart;
Fig. 5 is a cooperative multipoint transmission down-going synchronous information notice method flow chart in the embodiment of the invention;
Cooperative multipoint transmission downlink synchronization device structure chart in Fig. 6 embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment cooperative multipoint transmission down link synchronisation method provided by the invention and device, cooperative multipoint transmission down-going synchronous information notice method and device are illustrated in greater detail.
Down collaboration multicast communication (coordinated multipoint transmission/reception; CoMP) different in have one or more different transmission points constantly to UE (user equipment; Subscriber equipment) send useful signal, these transmission points have nothing in common with each other with the distance of UE.If UE receives signal synchronously according to the descending timing of certain unicast; Usually the descending timing with Serving cell is the initial moment of descending receiver window constantly; Then the useful signal of other transmission point transmission possibly produce intersymbol interference at the UE receiving terminal, reduces the system transmissions performance.
For solving the descending timing stationary problem in the cooperative multipoint transmission, the embodiment of the invention provides a kind of cooperative multipoint transmission down link synchronisation method, and is as shown in Figure 4, comprising:
In the embodiment of the invention; The base station is earlier with the information notice UE that transmits point in the big transmission point set; Obtain the synchronizing information of which transmission point as required, then select corresponding transmission point notice UE, UE confirms descending timing respectively constantly according to notice to the transmission point that needs obtain synchronizing information; And according to the earliest descending timing constantly and the descending timing of Serving cell constantly, the descending timing slip t of descending receiver window is set
Timing_offset, under the situation of necessity, the initial moment of descending receiver window is adjusted, with the intersymbol interference problem of avoiding a plurality of transmission point synchronization timing difference to bring, improve the transmission quality of multipoint cooperative transmission.
The descending timing of Serving cell constantly in the embodiment of the invention; Through confirming that the descending timing that has the transmission point (being transmission point in the Serving cell) of same cells sign cell ID with Serving cell obtains constantly; The transmission point that has identical cell ID with Serving cell possibly be one; Also maybe be for a plurality of, if one, descending timing of then confirming this transmission point be the descending timing moment of Serving cell constantly; If a plurality of, confirm then that wherein descending timing the earliest be the descending timing moment of Serving cell constantly.Having identical cell ID transmission point with Serving cell can be included in the above-mentioned transmission point set; Also can not be included in the set of transmission point; And give advance notice, and confirm that based on the information of transmission point descending timing constantly with the information from base station that Serving cell has an identical cell ID transmission point.
Confirm the descending timing moment of transmission point in the transmission set and the descending timing concrete mode constantly of Serving cell, do not limit here, can adopt and to realize obtaining descending timing any way constantly.
Preferably, the descending timing that the interior descending the earliest timing of transmitting point of definite transmission set is no earlier than Serving cell constantly is provided with t during the moment
Timing_offsetBe zero, the initial moment of confirming descending receiver window is the descending timing moment of Serving cell.If descending timing the earliest is no earlier than the descending timing moment of Serving cell constantly; The next OFDM symbol data of the transmission point that explanation is nearest apart from UE can not get into the current sign receiver window; Then the next OFDM symbol data of other transmission points more can not get into the current sign receiver window; If exist distance than Serving cell transmission point transmission point far away, then a last OFDM symbol data of these transmission points gets into the time of reception scope of current sign (comprising CP), owing to receive the protection of CP; Can not cause intersymbol interference yet; The design of existing CP guarantees that distance transmission point far away postpones the length that length can not surpass CP, so all transmission points all can not cause intersymbol interference, therefore need be to not adjusting according to the definite descending receiver window of transmission in the Serving cell.
Preferably, the descending the earliest timing of confirming transmission point in the set of transmission point constantly the time, is provided with t early than the descending timing of Serving cell constantly
Timing_offsetBe T
sPositive integer doubly, the initial moment of confirming current descending receiver window is the descending timing of the Serving cell t that constantly squints forward
Timing_offset, wherein, T
sBe the sampling period of system's baseband signal.If the descending the earliest timing moment of certain transmission point is early than the descending timing moment of Serving cell; The next OFDM symbol data that the transmission point is described can get into the current sign receiver window; The embodiment of the invention squints descending receiver window forward; So that the next OFDM symbol data of transmission point can not get into the current sign receiver window, thereby can not cause intersymbol interference.
Preferably, specifically confirm t with the descending the earliest timing difference constantly of the interior transmission point of transmission point set constantly according to the descending timing of Serving cell
Timing_offset, this difference multiply by T after being rounded up or down
sObtain t
Timing_offset, current, also can round the back certain integer value of skew up or down according to fault-tolerant ability and take advantage of into T again this difference
sObtain t
Timing_offset
Preferably, t in the present embodiment
Timing_offsetBe specially:
Wherein, t
Serving_cellBe the descending timing moment of Serving cell, t
ObjectBe the descending the earliest timing moment of transmission point in the transmission set, symbol
Expression rounds symbol downwards
Expression rounds up.
Preferably, t
Timing_offsetGet numerical value, can not cause descending timing the latest the delay of transmission point constantly to be no more than the length of CP as long as guarantee skew forward more than or equal to the descending timing descending the earliest timing difference constantly of transmission point constantly and in the set of transmission point.
The embodiment of the invention also provides a kind of cooperative multipoint transmission down-going synchronous information notice method, and is as shown in Figure 5, comprising:
The mode that combines to implement with network side and UE below provides the preferred embodiment of the present invention, mainly comprises following process:
Step 1, the information notice of optional transmission point.
The base station is that UE confirms optional transmission point and notifying the information of optional transmission point to UE.
Preferably, respectively transmit a little in the base station selected UE cooperation set, or a subset is respectively transmitted a little in the cooperation set, as optional transmission point.
The base station can be in advance and the optional transmission point corresponding sequence number of UE agreement; As the transmission point being numbered by certain default sequence; And not to the sequence number of user notification transmission point, also can be in the information of notifying optional transmission point, the optional transmission point corresponding sequence number of notice UE.Wherein, corresponding same sequence number is put in the transmission with identical traffic dot information, and the transmission point with different transmission dot informations is corresponding with different sequence numbers.
Optional transmission dot information can comprise: the setting of the CSI-RS reference signal that the cell ID cell ID of sub-district, transmission point place and/or transmission point are corresponding.
Preferably, during with the information notice UE of a plurality of optional transmission points, for the transmission point with identical traffic dot information, the information that only will have a transmission point in the transmission point of identical traffic dot information is notified UE.As when transmitting dot information for transmission point place sub-district cell ID, belong to the sequence number unanimity of the transmission point of same cell ID, select one of them notice to get final product.
The base station is specifically through the information (can comprise the tabulation of the sequence number of each transmission point) of high-level signaling with semi-static or each transmission point of static mode notice UE.Receive the notice of transmitting dot information for the ease of the user, the base station can also be notified the quantity of the transmission point of this notice of UE with high-level signaling.
UE receives high-level signaling; Obtain and store the transmission dot information of base station notice,, then obtain transmitting the tabulation of a sequence number if get access to the sequence number of each transmission point; If the sequence number of transmission point, then mode is added a sequence number and storage by default sequence for the transmission point by appointment.
Step 2, transmission point set notice.
Point is transmitted for the user selects at least one in the base station in optional transmission point, and searches the sequence number of each transmission point.The sequence number of each transmission point of selection is dynamically notified in the base station through the semi-static ground of high-level signaling or through Downlink Control Information DCI signaling.
When in said a plurality of optional transmission points, selecting at least one transmission point, for the transmission point of selecting with identical traffic dot information, the notice UE of a transmission point in the transmission point that only will select with identical traffic dot information.If a plurality of transmission points in the promptly base station selected transmission point have identical sequence number, then the base station can only be got the total sequence number of a plurality of transmission points with same sequence number and is notified to UE.
UE receives the signaling of base station notice, based at least one transmission point corresponding sequence number that base station in the signaling is selected in optional transmission point, confirms that the corresponding transmission point of sequence number of notice is formed the set of transmission point.UE can search the information of the transmission point of the sequence number correspondence of notifying each base station in transmission dot information of storing and sequence number tabulation, and identifies each transmission that finds point.
If UE receives sequence number notice and beginning and in tabulation, searches before the transmission dot information and had the transmission point to be labeled in the tabulation, then UE removes all existing marks earlier, begins to transmit dot information again and searches and transmit a mark.
Step 3, the descending timing of each transmission point is confirmed constantly in the set of transmission point.
UE uses the downlink synchronous signal of generation and/or the descending timing moment of each transmission point correspondence that the UE mark was obtained and kept to the local sequence of downlink reference signal to the local sequence of the transmission dot generation downlink synchronous signal and/or the downlink reference signal of each mark.
The method that UE obtained and kept the corresponding timing of certain transmission point of UE mark with downlink synchronous signal that generates and/or the local sequence of descending reference is: in received signal, detects first footpath time of reception of this transmission point downlink frame with the downlink synchronous signal of certain the transmission point that generates and/or the local sequence of reference signal, UE detected first directly the time of reception as this descending timing moment of transmitting.
Certainly, can also adopt other to confirm descending timing mode constantly.
Step 4, the confirming of the setting of the descending timing slip of UE and the descending initial moment of receiver window.
It is descending timing reference sub-district that UE selects its Serving cell, according to the descending the earliest timing of transmission point in the set of transmission point constantly and the descending timing of Serving cell constantly, descending timing slip t is set
Timing_offset, the descending timing that the initial moment of receiver window of UE reception downlink frame is set to reference cell deducts t constantly
Timing_offset
UE is provided with descending timing slip t
Timing_offsetMethod be: UE relatively the transmission point of its mark descending timing constantly, the search timing moment the earliest.If the timing the earliest that UE searches is no earlier than the descending timing moment of the descending timing reference of UE sub-district, then t constantly
Timing_offsetBe set to 0;
If the timing the earliest that UE searches early than the descending timing of the descending timing reference of UE sub-district constantly constantly, then with the earliest timing t is set constantly constantly according to the descending timing of descending timing reference sub-district
Timing_offsetParticularly, with the earliest timing t is set constantly constantly with the descending timing of descending timing reference sub-district
Timing_offsetMethod for example: t
Timing_offsetBe set to:
The cooperative multipoint transmission down link synchronisation method that the embodiment of the invention provides, under the cooperative multipoint transmission pattern, optional transmission point is selected for the user in the base station, and to optional transmission point numbering, the information of optional transmission point (and sequence number) is notified to UE by high-level signaling.The base station for UE selects the transmission point, is given UE the sequence number of transmission point through high-level signaling or DCI signaling from optional transmission point.The transmission point of UE mark base station notice.UE respectively regularly to the transmission point of mark, the initial moment of descending receiver window is confirmed in and the relatively timing of these transmission points and Serving cell.The intersymbol interference problem that can avoid a plurality of transmission point synchronization timing difference to bring improves the transmission quality of multipoint cooperative transmission.
Based on same inventive concept; A kind of cooperative multipoint transmission downlink synchronization device, a kind of cooperative multipoint transmission down-going synchronous information notification apparatus also are provided in the embodiment of the invention; Because the principle of these device solves problems and a kind of cooperative multipoint transmission down link synchronisation method, a kind of cooperative multipoint transmission down-going synchronous information notice method are similar; Therefore the enforcement of these equipment can repeat part and repeat no more referring to the enforcement of method.
A kind of cooperative multipoint transmission downlink synchronization device that the embodiment of the invention provides, as shown in Figure 6, comprising:
Information is preserved unit 601, is used to receive the information of a plurality of optional transmission point of notifying the base station and preserve;
Said cooperative multipoint transmission downlink synchronization device is a user equipment (UE).
A kind of cooperative multipoint transmission down-going synchronous information notification apparatus comprises:
First notification unit is used for the information notifying user equipment UE with a plurality of optional transmission points;
Second notification unit; Be used for selecting at least one transmission point and notice UE at said a plurality of optional transmission points; So that UE confirms the set of transmission point, with the descending timing of Serving cell descending receiver window is set constantly constantly according to the descending the earliest timing of transmission point in the set of transmission point.
Preferably, cooperative multipoint transmission down-going synchronous information notification apparatus is the base station in the embodiment of the invention.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of the embodiment of complete hardware embodiment, complete software implementation example or combination software and hardware aspect.And the present invention can be employed in the form that one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code go up the computer program of implementing.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out through the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in ability vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work; Make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device; Make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of on computer or other programmable devices, carrying out is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic inventive concept could of cicada, then can make other change and modification to these embodiment.So accompanying claims is intended to be interpreted as all changes and the modification that comprises preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (29)
1. a cooperative multipoint transmission down link synchronisation method is characterized in that, comprising:
Receive the information and the preservation of a plurality of optional transmission point of base station notice;
Confirm the set of transmission point based on the notice of base station, at least one transmission point that said transmission point set is selected in optional transmission point by the base station is formed;
According to the information of transmission point in the said transmission point set, the descending timing moment of each transmission point in definite respectively said transmission point set;
According to the descending the earliest timing of transmission point in the transmission point set constantly and the descending timing of Serving cell constantly, descending timing slip t is set
Timing_ottset, according to t
Timing_offsetConfirm the initial moment of descending receiver window.
2. the method for claim 1 is characterized in that, the descending timing that the descending the earliest timing of confirming transmission point in the set of transmission point is no earlier than Serving cell constantly is constantly the time,
T is set
Timing_offsetBe zero, the initial moment of confirming descending receiver window is the descending timing moment of Serving cell.
3. the method for claim 1 is characterized in that, the descending the earliest timing of confirming transmission point in the set of transmission point is constantly early than the descending timing of Serving cell constantly the time,
T is set
Timing_offsetBe T
sPositive integer doubly, the initial moment of confirming descending receiver window is the descending timing of the Serving cell t that constantly squints forward
Timing_offset, wherein, T
sBe the sampling period of system's baseband signal.
4. method as claimed in claim 3 is characterized in that, the descending the earliest timing of confirming transmission point in the set of transmission point is constantly early than the descending timing of Serving cell constantly the time,
Specifically confirm t with the descending the earliest timing difference constantly of the interior transmission point of transmission point set constantly according to the descending timing of Serving cell
Timing_offset
5. method as claimed in claim 4 is characterized in that t
Timing_offsetBe specially:
Wherein, t
Serving_cellBe the descending timing moment of Serving cell, t
ObjectBe the descending the earliest timing moment of transmission point in the transmission set.
6. the method for claim 1 is characterized in that, confirms the set of transmission point based on the notice of base station, specifically comprises:
Based at least one transmission point corresponding sequence number that the base station of base station notice is selected, confirm that the corresponding transmission point of sequence number of notice is formed the set of transmission point in optional transmission point;
Wherein, through the prior and optional transmission point corresponding sequence number of base station agreement, confirm the corresponding transmission point of sequence number of notice; When perhaps notifying the information of a plurality of optional transmission points based on the base station, the transmission point corresponding sequence number that each that notified is optional is confirmed the corresponding transmission point of sequence number of notice;
Wherein, corresponding same sequence number is put in the transmission with identical traffic dot information, and the transmission point with different transmission dot informations is corresponding with different sequence numbers.
7. the method for claim 1 is characterized in that, specifically receives the base station through the information of high-level signaling with a plurality of optional transmission point of semi-static or static mode notice.
8. the method for claim 1 is characterized in that, specifically receives the base station and passes through high-level signaling with semi-static mode or through Downlink Control Information DCI signaling at least one transmission point with the said selection of dynamical fashion notice.
9. the method for claim 1 is characterized in that, according to the information of transmission point in the said transmission point set, in the descending timing moment of each transmission point in definite respectively said transmission point set, specifically comprises:
Information based on transmission point in the said transmission point set generates the downlink synchronous signal of each transmission point in the said transmission point set and/or the local sequence of downlink reference signal;
Use each the transmission point downlink synchronous signal and/or the local sequence of downlink reference signal that generate, confirm the descending timing moment of this transmission point.
10. method as claimed in claim 9 is characterized in that, uses each the transmission point downlink synchronous signal and/or the local sequence of downlink reference signal that generate, confirms the descending timing moment of this transmission point, comprising:
With each transmission point downlink synchronous signal that generates and/or the local sequence of downlink reference signal, in the received signal of this transmission point, detect first footpath time of reception of this transmission point downlink frame;
Confirm first footpath time of reception of detected this transmission point downlink frame, the descending timing that is this transmission point constantly.
11. a cooperative multipoint transmission down-going synchronous information notice method is characterized in that, comprising:
Information notifying user equipment UE with a plurality of optional transmission points;
In said a plurality of optional transmission points, select at least one transmission point and notice UE,, with the descending timing of Serving cell descending receiver window is set constantly constantly based on the descending the earliest timing of transmission point in the set of transmission point so that UE confirms the set of transmission point.
12. method as claimed in claim 11 is characterized in that, in advance with each optional transmission point corresponding sequence number of UE agreement, when perhaps notifying UE with the information of a plurality of optional transmission points, the transmission point corresponding sequence number that each is optional is notified UE; Then
At least one transmission point notice UE of said selection is specifically comprised: with at least one transmission point corresponding sequence number notice UE of said selection;
Wherein, corresponding same sequence number is put in the transmission with identical traffic dot information, and the transmission point with different transmission dot informations is corresponding with different sequence numbers.
13. method as claimed in claim 11 is characterized in that, the information notice UE with a plurality of optional transmission points specifically comprises:
With the information of a plurality of optional transmission points through high-level signaling with semi-static or static mode notice UE.
14. method as claimed in claim 11 is characterized in that, at least one the transmission point notice UE with said selection specifically comprises:
Through high-level signaling with semi-static mode or through Downlink Control Information DCI signaling with dynamical fashion, with at least one transmission point notice UE of said selection.
15. like the arbitrary described method of claim 11～14; It is characterized in that; During with the information notice UE of a plurality of optional transmission points, for the transmission point with identical traffic dot information, the information that only will have a transmission point in the transmission point of identical traffic dot information is notified UE;
When in said a plurality of optional transmission points, selecting at least one transmission point, for the transmission point of selecting with identical traffic dot information, the notice UE of a transmission point in the transmission point that only will select with identical traffic dot information.
16. a cooperative multipoint transmission downlink synchronization device is characterized in that, comprising:
Information is preserved the unit, is used to receive the information of a plurality of optional transmission point of notifying the base station and preserve;
The unit is confirmed in set, is used for confirming the set of transmission point based on the notice of base station, and at least one transmission point that said transmission point set is selected in optional transmission point by the base station is formed;
The difference timing unit is used for the information based on transmission point in the said transmission point set, the descending timing moment of each transmission point in definite respectively said transmission point set;
Lock unit, be used for according to the descending the earliest timing of transmission point in the transmission point set constantly and the descending timing of Serving cell constantly, descending timing slip t is set
Timing_offset, according to t
Timing_offsetConfirm the initial moment of descending receiver window.
17. device as claimed in claim 16 is characterized in that, the descending timing that the interior descending the earliest timing of transmitting point of the definite transmission of a said lock unit set is no earlier than Serving cell constantly is provided with t during the moment
Timing_offsetBe zero, the initial moment of confirming descending receiver window is the descending timing moment of Serving cell.
18. device as claimed in claim 16 is characterized in that, the descending the earliest timing that said lock unit is confirmed transmission point in the set of transmission point constantly the time, is provided with t early than the descending timing of Serving cell constantly
Timing_offsetBe T
sPositive integer doubly, the initial moment of confirming descending receiver window is the descending timing of the Serving cell t that constantly squints forward
Timing_offset, wherein, T
sBe the sampling period of system's baseband signal.
19. device as claimed in claim 16; It is characterized in that; Set confirms that the unit is based on the set of the definite transmission point of the notice of base station; Specifically comprise:, confirm that the corresponding transmission point of sequence number of notice is formed the set of transmission point in optional transmission point based at least one transmission point corresponding sequence number that the base station of base station notice is selected; Wherein, through the prior and optional transmission point corresponding sequence number of base station agreement, confirm the corresponding transmission point of sequence number of notice; When perhaps notifying the information of a plurality of optional transmission points based on the base station, the transmission point corresponding sequence number that each that notified is optional is confirmed the corresponding transmission point of sequence number of notice;
Wherein, corresponding same sequence number is put in the transmission with identical traffic dot information, and the transmission point with different transmission dot informations is corresponding with different sequence numbers.
20. device as claimed in claim 16 is characterized in that, the information holding unit specifically receives the base station through the information of high-level signaling with a plurality of optional transmission point of semi-static or static mode notice.
21. device as claimed in claim 16 is characterized in that, set confirms that the unit specifically receives the base station and passes through high-level signaling with semi-static mode or through Downlink Control Information DCI signaling at least one transmission point with the said selection of dynamical fashion notice.
22. device as claimed in claim 16 is characterized in that, timing unit respectively according to the information of transmission point in the said transmission point set, generates in the said transmission point set each downlink synchronous signal that transmits and/or the local sequence of downlink reference signal; Use each the transmission point downlink synchronous signal and/or the local sequence of downlink reference signal that generate, confirm the descending timing moment of this transmission point.
23. device as claimed in claim 22; It is characterized in that; Timing unit respectively with each transmission point downlink synchronous signal that generates and/or the local sequence of downlink reference signal, detects first footpath time of reception of this transmission point downlink frame in the received signal of this transmission point; Confirm first footpath time of reception of detected this transmission point downlink frame, the descending timing that is this transmission point constantly.
24. device as claimed in claim 16 is characterized in that, said cooperative multipoint transmission downlink synchronization device is a user equipment (UE).
25. a cooperative multipoint transmission down-going synchronous information notification apparatus is characterized in that, comprising:
First notification unit is used for the information notifying user equipment UE with a plurality of optional transmission points;
Second notification unit; Be used for selecting at least one transmission point and notice UE at said a plurality of optional transmission points; So that UE confirms the set of transmission point, with the descending timing of Serving cell descending receiver window is set constantly constantly according to the descending the earliest timing of transmission point in the set of transmission point.
26. device as claimed in claim 25; It is characterized in that; First notification unit in advance with each optional transmission point corresponding sequence number of UE agreement, when perhaps notifying UE with the information of a plurality of optional transmission points, the transmission point corresponding sequence number that each is optional is notified UE; Then
Second notification unit specifically comprises at least one transmission point notice UE of said selection: with at least one transmission point corresponding sequence number notice UE of said selection;
Wherein, corresponding same sequence number is put in the transmission with identical traffic dot information, and the transmission point with different transmission dot informations is corresponding with different sequence numbers.
27. device as claimed in claim 25 is characterized in that, first notification unit with the information of a plurality of optional transmission points through high-level signaling with semi-static or static mode notice UE.
28. device as claimed in claim 25 is characterized in that, second notification unit through high-level signaling with semi-static mode or through Downlink Control Information DCI signaling with dynamical fashion, with at least one transmission point notice UE of said selection.
29. like the arbitrary described device of claim 25～28; It is characterized in that; First notification unit; During with the information notice UE of a plurality of optional transmission points, for the transmission point with identical traffic dot information, the information that only will have a transmission point in the transmission point of identical traffic dot information is notified UE;
Second notification unit, when in said a plurality of optional transmission points, selecting at least one transmission point, for the transmission point of selecting with identical traffic dot information, the notice UE of a transmission point in the transmission point that only will select with identical traffic dot information.
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