CN103684558B - Coordinated multipoint transmission processing method and system - Google Patents
Coordinated multipoint transmission processing method and system Download PDFInfo
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Abstract
The present invention provides a kind of coordinated multipoint transmission processing method and systems, this method comprises: determining the sending method for sending public reference signal CRS to user equipment (UE), wherein, above-mentioned sending method includes: only to send CRS by the macrocell in heterogeneous network, alternatively, sending CRS jointly by macrocell and the low power nodes for sending CRS that are triggered；According to determining sending method, carry out coordinated multipoint transmission processing, through the invention, that there are resource utilizations is not high for the coordinated multipoint transmission for solving in the related technology, and path loss obscures serious problem in power control, and then reached and effectively improved coordinated multipoint transmission resource utilization, it is fuzzy to mitigate power control path loss to a certain extent, and guarantee the effect covered to rear line.
Description
Technical field
The present invention relates to the communications fields, in particular to a kind of coordinated multipoint transmission processing method and system.
Background technique
In order to improve the spectrum efficiency and user's impression of Cell Edge User, in LTE Release 10 and Release 11
Introduce coordinated multipoint transmission (Multi-point Coordinated Transmission and reception, referred to as
CoMP) technology.In the CoMP scenario 4 that LTE R11 is mentioned, in many aspects, there are biggish advantage, these advantage packets
Include, (1) Macro(macrocell) and low power nodes between without open reference signal (Common Reference Signal,
Referred to as CRS) interference, reduce the dependence to CRS；(2) it is convenient for minizone demodulated reference signal (Demodulation
Reference Signal, referred to as DMRS) it is orthogonal；(3) it is able to carry out flexible channel state information-reference signal
(Channel State Information-Reference Signal, referred to as CSI-RS) configuration；(4) it is convenient for being based on
The interference measurement of CSI-RS；(5) mobile to user equipment (User Equipment, referred to as UE) that there is robustness (not need
Frequent switching).
But since under the scene, CRS is using single frequency network (Single Frequency Network, referred to as SFN)
Mode is sent, in order to adapt to carry out Physical Downlink Shared Channel (Physical Downlink Shared based on CRS
Channel, referred to as PDSCH) demodulation demand, PDSCH data also must simultaneously all nodes carry out SFN transmission, therefore
In the case that the UE transmitted based on CRS is more, there is a problem of that resource utilization is low.Fig. 1 is to exist in the related technology
There are the schematic diagrames based on CRS transmission when more UE under 4 scene of scenario, as shown in Figure 1, in scenario4, in order to
It is embodied as certain given earlier version user (UE#1 based on CRS transmission) and carries out data transmission, even if certain low power nodes
The tribute of (Low Power Point, referred to as LPN) (several low power nodes on the left side as shown in figure 1) to the UE transmitted based on CRS
Very little is offered, but under this scene, it is strictly required but as the UE service based on CRS transmission, there is no beneficial for these signals
Effect, but resource is wasted, in figureShown in resource, can not be reused by other low power nodes, low power nodes only
The occupied transmitted over resources of UE based on CRS transmission can be being violated, in figureShown in resource.
In addition, in order to guarantee correctly to demodulate PDSCH, under different low power nodes, it is necessary to configure identical Pa and Pb takes
Value, otherwise, since terminal can not determine that each node to the path loss situation of UE, can not determine that the ratio of final PDSCH and CRS closes
System.Even and if be configured with Pa, Pb parameter value is identical, and (wherein Pa is characterized on respective antenna port, when the OFDM symbol of not no CRS
Number or CRS when not borrowing PDSCH power, CRS and PDSCH send signal power than relationship, and Pb is indicated at respective antenna end
On mouth, after CRS has borrowed PDSCH power, CRS and PDSCH send power ratio relationship), network side determines the transmission function of CRS
It also can only be that the CRS of different low power nodes is sent power to be added when rate parameter.In turn, the path loss that UE measurement obtains be etc.
Imitate path lossAssuming that UE is close apart from some low power nodes, network side be difficult to it is most effective really
The path loss information of fixed different nodes, to be unfavorable for the configuration of the downlink power control to the UE transmitted based on CRS；At the same time, base
In the UE uplink power control of CRS transmission be also to be difficult to be control effectively according to different uplink receiving nodes, to increase pair
The interference of other uplink users.
Therefore, coordinated multipoint transmission in the related technology there are resource utilization is not high and power control in path loss mould
Paste serious problem.
Summary of the invention
The present invention provides a kind of coordinated multipoint transmission processing method and processing devices, at least to solve multiple spot in the related technology
Cooperation transmission there are resource utilization is not high and power control in path loss obscure serious problem.
According to an aspect of the invention, there is provided a kind of coordinated multipoint transmission processing method, comprising: true directional user sets
Standby UE sends the sending method of public reference signal CRS, wherein described sender formula includes: only by the macrocell in heterogeneous network
The CRS is sent, alternatively, sending the CRS jointly by the macrocell and the low power nodes for sending CRS that are triggered；According to
Determining described sender formula carries out coordinated multipoint transmission processing.
Preferably, after determining the sending method for sending public reference signal CRS to the UE, further includes: described low
Power node is user configuration interferometry resource IMR, to obtain the low power nodes ambient enviroment to the low-power
The interference of node, wherein the IMR is zero energy channel state information-reference signal CSI-RS；And/or the macrocell is
User configuration IMR, to obtain interference of the macrocell ambient enviroment to the macrocell, wherein the IMR is zero energy
CSI-RS。
Preferably, determine by the macrocell be triggered send CRS low power nodes send jointly the CRS it
Afterwards, further includes: the macrocell and described be triggered send the low power nodes of CRS and send institute by way of single frequency network SFN
State CRS；And/or according to determining described sender formula, carry out coordinated multipoint transmission processing include: the macrocell with it is described
Business number is sent in the resource that the low power nodes for sending CRS that are triggered are distributed by way of SFN to the UE demodulated based on CRS
According to.
Preferably, it determines and the CRS packet is sent by the macrocell and the low power nodes for sending CRS that are triggered jointly
It includes: sending the low power nodes of CRS by being triggered described in predetermined condition determination.
Preferably, the predetermined condition includes at least one of: channel quality information CQI, the low-power section of UE feedback
Point arrives the location information of the path loss information of UE, UE.
Preferably, determine by the macrocell be triggered send CRS low power nodes send jointly the CRS it
Afterwards, further includes: described be triggered sends the low power nodes of CRS and send the corresponding resource list of the CRS in the macrocell
Data are not mapped on RE, and/or, it maps on the corresponding resource list RE that the macrocell sends the CRS and faces with the RE
The identical data of close RE.
Preferably, further includes: setting scheduled duration, do not received in the scheduled duration business datum to be transmitted or on
When row scheduling request, the low power nodes enter silent status, wherein the low power nodes in silent status stop
Work.
Preferably, determine by the macrocell be triggered send CRS low power nodes send jointly the CRS it
It afterwards, further include that the low power nodes are closed by least one following triggering mode to CRS is sent: the low-power section
Point is closed according to user type triggering to CRS is sent；The low power nodes are according to receiving from the macrocell
It closes notification triggers and is closed to CRS is sent.
Preferably, determine to the UE send public reference signal CRS sending method after, further includes: by with
At least one under type sends system message and/or paging message to the UE: being covered by the macrocell and the macrocell
All low power nodes of lid send the system message and/or paging message to the UE in a manner of single frequency network SFN；By institute
State macrocell and triggering send the low power nodes of CRS in a manner of the SFN to the UE send the system message and/or
Paging message.
Preferably, determine to the UE send public reference signal CRS sending method after, further includes: by with
At least one under type sends Channel control messages to the UE, wherein the Channel control messages include at least one of:
Physical Downlink Control Channel message, physics automatic repeat request instruction channel massage, control channel format channel message, physics are wide
It broadcasts channel massage: the Channel control messages only being sent by macrocell；The institute covered by the macrocell and the macrocell
There are low power nodes to send the Channel control messages to the UE in a manner of single frequency network SFN；By the macrocell and triggering
The low power nodes for sending CRS send the Channel control messages to the UE in a manner of the SFN.
According to another aspect of the present invention, a kind of coordinated multipoint transmission processing system is provided, comprising: determining module is used
In the determining sending method for sending public reference signal CRS to user equipment (UE), wherein described sender formula includes: only by different
Macrocell in network forming sends the CRS, alternatively, being sent out jointly by the macrocell and the low power nodes for sending CRS that are triggered
Send the CRS；Processing module, for carrying out coordinated multipoint transmission processing according to determining described sender formula.
Preferably, further includes: the first configuration module is located in the low power nodes, for surveying for user configuration interference
Resource IMR is measured, to obtain interference of the low power nodes ambient enviroment to the low power nodes, wherein the IMR is
Zero energy channel state information-reference signal CSI-RS；And/or second configuration module, be located in the macrocell, for for
User configuration IMR, to obtain interference of the macrocell ambient enviroment to the macrocell, wherein the IMR is zero energy
CSI-RS。
Preferably, the determining module, for sending the low-power section of CRS by being triggered described in predetermined condition determination
Point.
Preferably, further includes: setup module does not receive to be passed for scheduled duration to be arranged in the scheduled duration
When defeated business datum or uplink scheduling request, the low power nodes enter silent status, wherein described in silent status
Low power nodes stop working.
Through the invention, using the sending method determined to user equipment (UE) transmission public reference signal CRS, wherein institute
Stating sending method includes: only to send the CRS by the macrocell in heterogeneous network, alternatively, by the macrocell and the transmission that is triggered
The low power nodes of CRS send the CRS jointly；According to determining described sender formula, coordinated multipoint transmission processing, solution are carried out
The coordinated multipoint transmission determined in the related technology there are resource utilization is not high and power control in path loss obscure serious ask
Topic, and then reached and effectively improved coordinated multipoint transmission resource utilization, mitigate power control path loss to a certain extent and obscures, and
Guarantee the effect covered to rear line.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is that there are the schematic diagrames based on CRS transmission when more UE under 4 scene of scenario in the related technology；
Fig. 2 is the flow chart of coordinated multipoint transmission processing method according to an embodiment of the present invention；
Fig. 3 is the structural block diagram of coordinated multipoint transmission processing system according to an embodiment of the present invention；
Fig. 4 is the structural block diagram of coordinated multipoint transmission processing system according to an embodiment of the present invention；
Fig. 5 is the structural block diagram of coordinated multipoint transmission processing system according to an embodiment of the present invention；
Fig. 6 is macrocell according to an embodiment of the present invention and low power nodes carry out rate-matched and data mapping
Schematic diagram one；
Fig. 7 is macrocell according to an embodiment of the present invention and low power nodes carry out rate-matched and data mapping
Schematic diagram two；
Fig. 8 is the schematic diagram of coordinated multipoint transmission according to an embodiment of the present invention.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in combination with Examples.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
A kind of coordinated multipoint transmission processing method is provided in the present embodiment, and Fig. 2 is according to an embodiment of the present invention more
The flow chart of point cooperation transmission processing method, as shown in Fig. 2, the process includes the following steps:
Step S202 determines the sending method that public reference signal CRS is sent to user equipment (UE), wherein the sender
Formula includes: only to send above-mentioned CRS by the macrocell in heterogeneous network, alternatively, by macrocell and being triggered and sending the low-power section of CRS
Point sends above-mentioned CRS jointly；
Step S204 carries out coordinated multipoint transmission processing according to determining above-mentioned sending method.
Through the above steps, by only sending CRS by macrocell, alternatively, by macrocell and being triggered and sending the low function of CRS
Rate node sends CRS jointly, and the node all relative to coordinated multipoint transmission in the related technology is involved in be transmitted based on CRS,
And lesser low power nodes are contributed to carry out choosing to low power nodes using above-mentioned processing to based on CRS transmission there are some
It is used for the transmission based on CRS with selecting, thus the resource of lesser low power nodes can will be contributed to save based on CRS transmission
For other, the utilization rate of system resource is not only increased, moreover, it is fuzzy to alleviate power control path loss to a certain extent, Yi Jibao
The covering to rear line is demonstrate,proved.
In order to reduce the interference between power node and low power nodes and between low power nodes and macrocell,
It is user configuration zero energy channel state information with reference to letter after determining the sending method for sending public reference signal CRS to UE
Number for measuring the interference of ambient enviroment, such as: low power nodes are user configuration interferometry resource IMR, low to obtain
Interference of the power node ambient enviroment (macrocell or other low power nodes) to the low power nodes, wherein the IMR is zero
Power channel status information-reference signal CSI-RS；And/or macrocell is user configuration IMR, to obtain around macrocell
Interference of the environment (low power nodes and adjacent cells) to macrocell, wherein the IMR is zero energy CSI-RS.Using zero energy
Interference brought by interferometry resource itself can be effectively avoided in CSI-RS.
It should be noted that when determination sends CRS jointly with the low power nodes for sending CRS that are triggered by macrocell,
Can be determined by predetermined condition and be triggered and send the low power nodes of CRS, wherein the predetermined condition may include it is following at least
One of: the channel quality information CQI of UE feedback, the path loss information of low power nodes to UE, UE location information.
In order to improve the reliability for sending information, it is total to determining by macrocell and the low power nodes for sending CRS that are triggered
After sending CRS, macrocell can send this by way of single frequency network SFN with the low power nodes for sending CRS that are triggered
CRS；And/or according to determining sending method, carries out coordinated multipoint transmission processing and include: macrocell and be triggered and send CRS's
Business datum is sent in the resource that low power nodes are distributed by way of SFN to the UE demodulated based on CRS.That is CRS be based on
The business datum that CRS is distributed in resource can be sent using the sending method of SFN, guarantee the reliability of transmission.
It equally,, can also be by the way of SFN in the transmission to some control information in order to transmit the reliable of information
It sends, for example, sending system message and/or paging message to UE at least one in the following manner: by macrocell and macro small
All low power nodes that area is covered send system message and/or paging message to UE in a manner of single frequency network SFN；By macro small
The low power nodes that area and triggering send CRS send system message and/or paging message to UE in a manner of SFN.
In another example sending Channel control messages to UE at least one in the following manner, wherein the Channel control messages packet
Include at least one of: Physical Downlink Control Channel message, physics automatic repeat request instruction channel massage, control channel format
Channel massage, Physical Broadcast Channel message: Channel control messages are only sent by macrocell；It is covered by macrocell and macrocell
All low power nodes send Channel control messages to UE in a manner of single frequency network SFN；The low of CRS is sent by macrocell and triggering
Power node sends Channel control messages to UE in a manner of SFN.When above-mentioned each message joint is sent, it can be set according to predetermined
Fixed rule is combined into different sending methods and is sent.
In addition, in order to avoid sharing the interference of channel when macrocell sends CRS to the downlink physical that low power nodes are sent,
Following processing can be used: i.e. after determination sends CRS jointly with the low power nodes for sending CRS that are triggered by macrocell,
It is triggered and sends the low power nodes of CRS and do not map data on the corresponding resource list RE that macrocell sends CRS, and/or,
Macrocell sends mapping data identical with the RE that the RE closes on the corresponding resource list RE of CRS.
Preferably, after determination sends CRS jointly with the low power nodes for sending CRS that are triggered by macrocell, not
When the low power nodes being needed to send CRS, alternatively, the pass that post sends CRS can be triggered when scene state changes
It closes, for example, the low power nodes can be closed by least one following triggering mode to CRS is sent: low power nodes
It is closed according to user type triggering to CRS is sent；Low power nodes are according to the closing notice touching received from macrocell
Hair is closed to CRS is sent.Certainly, in order to which system is preferably energy saving, a certain scheduled duration can be set (can be according to specific
Depending on situation), when not receiving business datum to be transmitted or uplink scheduling request in the scheduled duration, low power nodes enter
Silent status, wherein the low power nodes in silent status stop working and (do not send all signals).
A kind of coordinated multipoint transmission processing system is additionally provided in the present embodiment, and the system is for realizing above-described embodiment
And preferred embodiment, the descriptions that have already been made will not be repeated.As used below, term " module " may be implemented to make a reservation for
The combination of the software and/or hardware of function.It is hard although device described in following embodiment is preferably realized with software
The realization of the combination of part or software and hardware is also that may and be contemplated.
Fig. 3 is the structural block diagram of coordinated multipoint transmission processing system according to an embodiment of the present invention, as shown in figure 3, this is more
Point cooperation transmission processing system 30 includes determining module 32 and processing module 34, is illustrated below to the system.
Determining module 32, for determining the sending method for sending public reference signal CRS to user equipment (UE), wherein should
Sending method includes: only to send CRS by the macrocell in heterogeneous network, alternatively, by macrocell and being triggered and sending the low-power of CRS
Node sends CRS jointly；Processing module 34 is connected to above-mentioned determining module 32, for carrying out more according to determining sending method
Point cooperation transmission processing.
Fig. 4 is the structural block diagram of coordinated multipoint transmission processing system according to an embodiment of the present invention, as shown in figure 4, this is
System further includes the first configuration module 42 in the low power nodes and is located at macro small in addition to including all modules shown in Fig. 3
Second configuration module 44 in area, is below illustrated above-mentioned two module respectively.
First configuration module 42 is located in low power nodes, for being user configuration interferometry resource IMR, to obtain
Take interference of the low power nodes ambient enviroment to low power nodes, wherein the IMR is zero energy channel state information-reference letter
Number CSI-RS；And/or second configuration module 44, it is located in macrocell, for being user configuration IMR, to obtain macrocell week
Interference of the collarette border to macrocell, wherein the IMR is zero energy CSI-RS.
Preferably, above-mentioned determining module is also used to send the low power nodes of CRS by determining be triggered of predetermined condition.
Fig. 5 is the structural block diagram of coordinated multipoint transmission processing system according to an embodiment of the present invention, as shown in figure 5, the dress
It sets in addition to including all modules shown in Fig. 3, further includes setup module 52, be connected to above-mentioned processing module 34, it is pre- for being arranged
Timing is long, and when not receiving business datum to be transmitted or uplink scheduling request in scheduled duration, which enters quiet
Silent state, wherein the low power nodes in silent status stop working.
Through the foregoing embodiment and preferred embodiment, the cooperative transmission in a kind of wireless communication system heterogeneous network is provided
Technology is based on the technology, can greatly improve the resource utilization of system.
The multi-point cooperative transmission method in a kind of heterogeneous network is provided in the present embodiment, comprising: Macro periodicity sending
CRS(is for example, continue to use 8 mode of LTE Release, i.e., in non-multicast broadcast single frequency network (non-Multicast Broadcast
Single Frequency Network, referred to as non-MBSFN subframe and multicast broadcast single frequency network (Multicast
Broadcast Single Frequency Network, referred to as MBSFN) subframe control domain send), low power nodes are not
It sends CRS or sends CRS by way of triggering.Low power nodes carry out rate-matched to CRS when data are mapped, wherein
Macro and low power nodes use identical physical district ID.
Subframe is sent in system message and/or paging message, wherein above-mentioned message is used the side of SFN by all nodes
Formula is sent, or is sent by the low power nodes SFN that Macro and triggering send CRS.CRS is only sent out by Macro in above-mentioned subframe
It send, alternatively, CRS is sent by the low power nodes that Macro sends CRS with triggering using SFN mode in above-mentioned subframe.
Low power nodes are user configuration zero energy channel state information-reference signal (zero power CSI-RS) work
For interferometry resource (interference measurement resource, referred to as IMR), it is used for Macro PDSCH
And the measurement of the interference of peripheral cell.When Macro is transmitted also based on DMRS, Macro is user configuration IMR, for low function
The measurement of rate node and peripheral cell interference.
When low power nodes send CRS by way of triggering, and when sending CRS, with Macro by way of SFN
CRS is sent, while in the resource for the UE distribution transmitted based on CRS, being sent out with Macro by way of SFN for corresponding UE
Send downlink service data.It is the low power nodes that UE is serviced without being sent by Macro triggering CRS and being passed through SFN, it can be in weight
It is that other UE based on DMRS transmission send data with resource.
More preferably, the trigger condition for sending the downlink business of CRS and corresponding UE using SFN according to Macro is triggered to Pico
Are as follows: the CQI in the CSI information of UE feedback is lower than threshold value.
When low power nodes are sent within given time without business datum, silent shape is switched to by state of activation automatically
State, until receiving activation signal again.For example, above-mentioned activation signal can be the activation signal sent by Macro,
It can be and signal is found by the node that UE is sent；Wherein when activation signal is sent by UE, activation signal is sensitizing pulse or section
Point discovery activation signal sequence.
Can not be sent by any information, can also be sent on the correspondence RE that Macro sends CRS for low power nodes
Close on the repeating signal of PDSCH information on RE.
It is low after low power nodes and Macro are disappeared to the UE covering demand transmitted based on CRS commonly through SFN mode
The transmission of power node closing CRS；Wherein, the triggering for closing CRS transmission can be by low power nodes foundation user type voluntarily
Judgement can also be sent by Macro and close the closing CRS transmission of message informing low power nodes.
To Physical Downlink Control Channel, physical mixed automatic repeat request (Hybrid Automatic Repeat
Request, referred to as HARQ) instruction channel, control channel format channel, Physical Broadcast Channel, the transmission of above-mentioned channel information
Mode can also use various ways, such as: can be independently transmitted by Macro or pass through SFN by Macro and low power nodes
Mode sends or is sent by Macro and the low power nodes for sending CRS that are triggered.In addition, to all nodes of synchronizing channel
It can be sent by the way of SFN.
When sending above- mentioned information alone by Macro, and when system message and paging message are sent alone by Macro, if
Low power nodes are not triggered the transmission of CRS, then low power nodes do not send any CRS；It is above-mentioned when being sent alone by Macro
Channel information, and when system message and paging message are sent jointly by Macro and low power nodes SFN, low power nodes only exist
CRS is sent in the subframe that system message and paging message are sent.
When sending above-mentioned channel information by SFN by Macro and low power nodes, and system message and paging message by
When Macro is sent alone, the transmission of CRS if low power nodes are not triggered, low power nodes are only sent in control domain
CRS；When sending above-mentioned channel information by SFN by Macro and low power nodes, and system message and paging message are by Macro
When sending jointly with low power nodes SFN, low power nodes send CRS in the subframe that system message and paging message are sent,
In other subframes that system message and paging message are sent, CRS only is sent in control domain.
Through the foregoing embodiment and preferred embodiment mentions on the basis of guaranteeing 4 beneficial effect of LTE scenario
High reuse efficiency of the resource in low power nodes, not only contributes to the management of power control and the raising of path loss measurement accuracy,
Moreover, can guarantee the covering to rear line to a certain extent, in addition, also efficiently avoiding the UE transmitted based on CRS
The problem that time synchronization tracking and Frequency Synchronization tracking obscure.
The embodiment of the present invention and preferred embodiment are illustrated below with reference to various realization purposes.
In order to improve the level of resources utilization of system, low power nodes being allowed to reuse Macro(macrocell) cell is most
Resource more than possible, in the normal mode of operation, public reference signal (CRS) is only sent in Macro, low power nodes
Signal location, which is sent, in Macro CRS carries out resource impact according to the rate-matched mode of LTE R10.Wherein, low power nodes
It can be, but not limited to Microcell (micro cell), picocell (pico cell), remote radio head (RRH), Home eNodeB
(HeNB), cell (small cell), relay node (Relay), Femto cell (Femtocell).Wherein earlier version is used
(UE based on CRS transmission) refers to LTE R8, R9 user at family.Simultaneously in order to avoid the frequent switching of terminal and different low-power
Node and Macro configure CRS interference problem caused by the ID of different community, are Macro and the identical cell of low power nodes configuration
ID。
In order to realize to the UE(LTE release 8/release 9UE transmitted based on CRS) covering, can trigger low
Power node sends CRS according to mode identical with Macro, wherein sends CRS with Macro same way here and refers to that CRS schemes
The sequence of sample and CRS are all identical as Macro.Meanwhile according to mode identical to Macro to the corresponding UE's based on CRS transmission
PDSCH data carry out resource impact, to realize that Macro and the low power nodes being triggered use the mode of SFN for based on CRS
The UE of transmission sends CRS and PDSCH data.Wherein, triggering low power nodes are the triggering side for the UE service transmitted based on CRS
Formula can be triggered by Macro, can also independently be triggered by Pico.
When low power nodes, which are not triggered, sends CRS signal, low power nodes are in its coverage area based on DMRS
User carries out the transmission of data, while the user of low power nodes service, is measured by CSI-RS.It is passed when to based on CRS
After defeated UE is disappeared by the demand that Macro and low power nodes collectively cover, low power nodes can be according to business datum class
The transmission of CRS is voluntarily closed in the judgement of type, or the transmission of closing CRS is notified by Macro.
Sending to Pico triggering CRS can be determined based on the UE CQI information fed back；Network side is fed back based on UE
CQI information determines UE channel quality, and when CQI value is lower than a certain thresholding, network side further judges between UE and different Pico
Path loss situation, wherein the method for judging path loss situation can be at least one of: according to UE feedback reference signal receive
Power and/or Reference Signal Received Quality and reference signal send power judgement, are believed according to the received UE uplink of different Pico
The judgement of number power.Network side is the Pico that UE selects one or more path losses small, and triggers the transmission that Pico carries out CRS；Network
Side sends CRS by Macro and Pico by the way of SFN, and sends downlink service data by way of SFN for UE.Wherein,
It is sending between business datum, the feedback result that network side can also wait UE to feed back next time, and according to feedback result, is passing through
Macro and Pico sends CRS and downlink service data (for example, PDSCH) by the way of SFN.
Feedback information judgement can be measured by upper and lower signal or CSI-RS to the identification of the location information of UE.Wherein, right
In the UE transmitted based on CRS, mainly by uplink signal (for example, it may be Physical Random Access Channel (Physical
Random Access Channel, referred to as PRACH) signal, Physical Uplink Control Channel/Physical Uplink Shared Channel
(physical uplink control channel/physical uplink shared channel, referred to as PUCCH/
PUSCH) signal) measure the location information for estimating UE.For R11 and R11+ user, it can be measured and be estimated by uplink signal,
Can by UE based on CSI-RS measurement feedback information (for example, UE feedback the Reference Signal Received Power based on CSI-RS/
Reference Signal Received Quality (Reference Signal Received Power/Reference Signal Received
Quality, referred to as RSRP/RSRQ), the CSI based on CSI-RS).
Since under normal circumstances, only Macro sends CRS, sending method can continue to use the side of LTE Release 8
Formula sends CRS in the control domain of each non-MBSFN subframe and MBSFN sub-frame.Therefore, the UE for being transmitted based on CRS
For, in the absence of between synchronized tracking and the fuzzy problem of Frequency Synchronization tracking.And the UE for being transmitted based on DMRS, then it can be with
Tracking is synchronized based on CSI-RS, while in the case of necessary (for example, existing for UE is configured with more set CSI-RS resource),
The corresponding relationship of CSI-RS and DMRS can be configured, by high-level signaling in order to determine the reference of DMRS synchronized tracking.
For R10, R11 and R11+ user, the determination of power control is based on CSI-RS measurement result and is adjusted, for being based on
The UE of CRS transmission, is measured by CRS, since under the scene, under normal circumstances, sending node is all uniquely determined, therefore,
Fuzzy problem can be configured to avoid uplink power control.
Fig. 6 is macrocell according to an embodiment of the present invention and low power nodes carry out rate-matched and data mapping
Schematic diagram one, as shown in fig. 6, in order to avoid the interference of the Macro CRS PDSCH sent to low power nodes, low power nodes
When carrying out data mapping, to Macro send CRS RE(Resource element) on, according to the identical mode of Macro into
Row rate-matched is (to the identical mode of CRS rate-matched when mapping with LTE R8, on the position RE that Macro sends CRS not
Data are mapped, and when being mapped, skip this part RE).
Pico can not map any data on the position RE that Macro sends CRS, or in order to assist to pass based on CRS
The PDSCH transmission bring interference of UE under defeated UE measurement low power nodes, on the position RE that Macro sends CRS, mapping with
The repeating signal of its corresponding dataRE, Fig. 7 are that macrocell according to an embodiment of the present invention and low power nodes carry out rate
The schematic diagram two of matching and data mapping, as shown in fig. 7, data map on the RE of rate matching in LPN, mapping
The identical data of data RE closed on for it, wherein X indicates the data mapped on RE adjacent thereto.
To for for transmitted based on CRS UE transmission resource, when low power nodes be not triggered for carry out CRS and
When PDSCH SFN is sent, low power nodes can reuse the part resource for carrying out the transmission based on DMRS, wherein be based on
DMRS transmission refers to that the user serviced is based on DMRS and demodulates, while carrying out strategy based on CSI-RS.To relative to R11
CoMP scenario 4 define transmission mode improve the level of resources utilization.Fig. 8 is multiple spot according to an embodiment of the present invention
The schematic diagram of cooperation transmission, as shown in figure 8, being noted asResource by Macro distribution for for the UE that is transmitted based on CRS
(CRS based transmission) is transmitted, the low-power not being triggered for carrying out CRS and PDSCH SFN transmission
Node can reuse this part resource for the transmission (DMRS based transmission) based on DMRS, that is,WithMark
The resource of note can be used in the transmission (as shown in the solid arrow in figure) based on DMRS, and really be used to transmit based on CRS
UE is only by macrocell, and the cell closed on the most with the UE1 is sent shown in dotted arrow of the CRS(such as in figure).
In order to improve the reliability of system message, paging information, while the compatible UE transmitted based on CRS, disappear above-mentioned
Cease the subframe sent, it is preferred that above- mentioned information and CRS are sent by way of SFN on Macro and low power nodes.Simultaneously
Primary synchronization channel and auxiliary synchronization channel and broadcast channel are also sent by the way of SFN.Above- mentioned information can also be only by Macro
It sends, CRS also only has Macro and sends at this time.
To Physical Downlink Control Channel, Physical HARQ Indicator Channel, control channel format channel, Physical Broadcast Channel, by
Macro is independently transmitted or Macro is sent by Macro and low power nodes or had by SFN mode and is triggered and sends CRS
Low power nodes send.All node SFN modes of synchronizing channel are sent.When sending above- mentioned information alone by Macro, and it is
When system message and paging message are sent alone by Macro, the transmission of CRS if low power nodes are not triggered, low-power
Node does not send any CRS；When sending above-mentioned channel information alone by Macro, and system message and paging message by Macro and
When low power nodes SFN is sent jointly, low power nodes only send CRS in the subframe that system message and paging message are sent.
When sending above-mentioned channel information by SFN by Macro and low power nodes, and system message and paging message by Macro alone
When transmission, the transmission of CRS if low power nodes are not triggered, low power nodes only send CRS in control domain；When by
Macro sends above-mentioned channel information by SFN with low power nodes, and system message and paging message are by Macro and low-power
When node SFN is sent jointly, low power nodes send CRS in the subframe that system message and circulation message are sent, and disappear in system
In other subframes that breath and circulation message are sent, CRS only is sent in control domain.
In order to reduce the interference between low power nodes and Macro and low power nodes, for the use transmitted based on DMRS
Family configure zero energy CSI-RS, as interferometry resource (interference measurement resource, referred to as
IMR), wherein low power nodes configure IMR for the interference of terminal measurement Macro PDSCH and the interference of adjacent cells；
Macro can equally configure zero energy CSI-RS when based on DMRS transmission, measure low power nodes for terminal and close on small
The interference in area.
For realize system energy conservation, can according to when low power nodes within given time without business datum send when,
Automatically silent status is switched to by state of activation, until receiving activation signal again.Wherein, activation signal can be by
The activation signal that Macro is sent is also possible to find signal by the node that UE is sent；Wherein, when activation signal is sent by UE,
Activation signal is that sensitizing pulse or node find activation signal sequence.
Through the foregoing embodiment and preferred embodiment, it provides in a kind of wireless communication system based on the association in heterogeneous network
Same transmission technology is based on the technology, the resource utilization of existing system can be greatly improved, furthermore it is also possible to mitigate existing system
The fuzzy problem of path loss in power control in system.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of coordinated multipoint transmission processing method characterized by comprising
Determine the sending method that public reference signal CRS is sent to user equipment (UE), wherein described sender formula includes:
The CRS is only sent by the macrocell in heterogeneous network, alternatively, by the macrocell and being triggered and sending the low-power of CRS
Node sends the CRS jointly；
According to determining described sender formula, coordinated multipoint transmission processing is carried out.
2. the method according to claim 1, wherein sending public reference signal CRS's determining to the UE
After sending method, further includes:
The low power nodes are user configuration interferometry resource IMR, to obtain the low power nodes ambient enviroment pair
The interference of the low power nodes, wherein the IMR is zero energy channel state information-reference signal CSI-RS；And/or
The macrocell is user configuration IMR, to obtain interference of the macrocell ambient enviroment to the macrocell,
In, the IMR is zero energy CSI-RS.
3. the method according to claim 1, wherein determining by the macrocell and being triggered and send CRS's
Low power nodes are sent jointly after the CRS, further includes:
The macrocell and described be triggered send the low power nodes of CRS and send the CRS by way of single frequency network SFN；
And/or
According to determining described sender formula, carrying out coordinated multipoint transmission processing includes: the macrocell and the hair that is triggered
Business datum is sent in the resource for sending the low power nodes of CRS to distribute by way of SFN to the UE demodulated based on CRS.
4. sending the low of CRS with being triggered by the macrocell the method according to claim 1, wherein determining
It includes: to send the low power nodes of CRS by being triggered described in predetermined condition determination that power node sends the CRS jointly.
5. according to the method described in claim 4, it is characterized in that, the predetermined condition includes at least one of:
The channel quality information CQI of UE feedback, the path loss information of low power nodes to UE, UE location information.
6. the method according to claim 1, wherein determining by the macrocell and being triggered and send CRS's
Low power nodes are sent jointly after the CRS, further includes:
It is described be triggered the low power nodes for sending CRS on the corresponding resource list RE that the macrocell sends the CRS not
Data are mapped, and/or, the RE closed on the RE is mapped on the corresponding resource list RE that the macrocell sends the CRS
Identical data.
7. the method according to claim 1, wherein further include:
Scheduled duration is set, it is described when not receiving business datum to be transmitted or uplink scheduling request in the scheduled duration
Low power nodes enter silent status, wherein the low power nodes in silent status stop working.
8. the method according to claim 1, wherein determining by the macrocell and being triggered and send CRS's
It further include that the low power nodes pass through at least one following triggering mode pair after low power nodes send the CRS jointly
CRS is sent to be closed:
The low power nodes are triggered according to user type and are closed to transmission CRS；The low power nodes are according to receiving
Closing notification triggers from the macrocell are closed to CRS is sent.
9. the method according to claim 1, wherein sending public reference signal CRS's determining to the UE
After sending method, further includes: send system message and/or paging message to the UE at least one in the following manner:
All low power nodes covered from the macrocell and the macrocell are sent out in a manner of single frequency network SFN to the UE
Send the system message and/or paging message；
The low power nodes for sending CRS from the macrocell and triggering send the system to the UE in a manner of the SFN
Message and/or paging message.
10. the method according to claim 1, wherein sending public reference signal CRS's determining to the UE
After sending method, further includes: send Channel control messages to the UE at least one in the following manner, wherein the letter
Road control message includes at least one of: Physical Downlink Control Channel message, physics automatic repeat request instruction channel massage,
Control channel format channel message, Physical Broadcast Channel message:
The Channel control messages are only sent by macrocell；
All low power nodes covered from the macrocell and the macrocell are sent out in a manner of single frequency network SFN to the UE
Send the Channel control messages；
The low power nodes for sending CRS from the macrocell and triggering send the channel to the UE in a manner of the SFN
Control message.
11. a kind of coordinated multipoint transmission processing system characterized by comprising
Determining module, for determining the sending method for sending public reference signal CRS to user equipment (UE), wherein the transmission
Mode includes: only to send the CRS by the macrocell in heterogeneous network, alternatively, sending the low of CRS with being triggered by the macrocell
Power node sends the CRS jointly；
Processing module, for carrying out coordinated multipoint transmission processing according to determining described sender formula.
12. system according to claim 11, which is characterized in that further include:
First configuration module is located in the low power nodes, for being user configuration interferometry resource IMR, to obtain
Interference of the low power nodes ambient enviroment to the low power nodes, wherein the IMR is zero energy channel status letter
Breath-reference signal CSI-RS；And/or
Second configuration module is located in the macrocell, for being user configuration IMR, to obtain ring around the macrocell
Interference of the border to the macrocell, wherein the IMR is zero energy CSI-RS.
13. system according to claim 11, which is characterized in that
The determining module, for sending the low power nodes of CRS by being triggered described in predetermined condition determination.
14. system according to claim 11, which is characterized in that further include:
Setup module does not receive business datum or uplink tune to be transmitted for scheduled duration to be arranged in the scheduled duration
When degree request, the low power nodes enter silent status, wherein the low power nodes in silent status stop work
Make.
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| CN101534285B (en) * | 2009-04-09 | 2015-07-22 | 中兴通讯股份有限公司 | A sending method for reference signals |
| US8923216B2 (en) * | 2009-07-30 | 2014-12-30 | Qualcomm Incorporated | Robust decoding of CoMP transmissions |
| CN102264105B (en) * | 2010-05-24 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of multi-point cooperative transmission method and device |
| EP2673910B1 (en) * | 2011-02-09 | 2018-01-10 | Telefonaktiebolaget LM Ericsson (publ) | Distribution of cell-common downlink signals in a hierarchical heterogeneous cell deployment |
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