CN106817209A - It is used to implement the method and its device of downlink transfer in millimeter-wave systems - Google Patents
It is used to implement the method and its device of downlink transfer in millimeter-wave systems Download PDFInfo
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Abstract
Embodiment of the disclosure discloses a kind of method and its device for being used to implement downlink transfer in the base station end of millimeter-wave systems, and the method includes：For each user terminal determines downlink reference signal；For the downlink reference signal of each user terminal distributes a port for being used to implement downlink transfer；Downlink reference signal corresponding to each port is mapped at least one resource element；Corresponding downlink reference signal is sent at least one resource element.Embodiment of the disclosure is also disclosed a kind of method and its device for being used to implement downlink transfer in the user terminal of millimeter-wave systems, and the method includes：Downlink reference signal is obtained at least one resource element from resource subregion；Physical Downlink Control Channel and/or physical down data channel are demodulated with the downlink reference signal.
Description
Technical field
Embodiment of the disclosure is related to wireless communication field, in particular it relates to a kind of method and its device for being used to implement downlink transfer in millimeter-wave systems.
Background technology
The target of 5G physical layers is to provide preferable performance on data transfer rate and delay in the case of reduces cost and power consumption.In order to reach the data rate request of the gigabits/second of mobile cellular communication standard of future generation, a kind of selection is using the available bandwidth in millimeter wave frequency band.When being operated in millimeter wave frequency band, there is some unfavorable propagation characteristics, including strong path loss in wireless channel, air and rainwater are absorbed, and low diffraction and obstacle around roadblock are penetrated.
For the propagation characteristic for overcoming these unfavorable, big array and narrow beam are by the important technology of as data transfer.However, under millimeter wave channel circumstance, transmission on down control channel and the scheme for the channel measurement of data channel are still blank.In 4G LTE/LTE-A, CRS based on non-precoded come implement channel measurement and demodulation Physical Downlink Control Channel (PDCCH), but for millimeter wave, due to the characteristic of above millimeter wave channel, the transmission plan of LTE control channels is reused in millimeter-wave systems cannot meet the requirement of signal to noise ratio and signal covering.
Therefore, in the present invention, the characteristics of we are based in millimeter-wave communication system for broadband or the narrow-band user DRS (Dedicated Reference Signal) of down control channel, recommends several new transmission plans.In addition we prefer that scheme be not limited only to the transmission of down control channel, based on the data transfer using same wideband or the beam forming of arrowband can also by it is proposed that scheme support.This programme and saves the signaling consumption of reference signal this simplifies the design of reference signal.For concise consideration, during the invention after is introduced, we mainly introduce the transmission of down control channel, and compared with the transmission of existing LET/LTE-A down control channels, the transmission influence of control channel is bigger.
The content of the invention
Therefore, the first aspect of the disclosure provides a kind of method for being used in the base station end of millimeter-wave systems and implementing downlink transfer, including：For each user terminal determines downlink reference signal；For the downlink reference signal of each user terminal distributes a port for being used to implement downlink transfer；Downlink reference signal corresponding to each port is mapped at least one resource element；Corresponding downlink reference signal is sent at least one resource element.
In one embodiment, the step that the downlink reference signal corresponding to each port is mapped at least one resource element is specifically included：Downlink reference signal corresponding to first quantity port is respectively mapped on the first quantity resource element.
In one embodiment, the step that the downlink reference signal corresponding to each port is mapped at least one resource element is specifically included：Downlink reference signal corresponding to first quantity port is combined, and map on the first quantity resource element, wherein the downlink reference signal corresponding to the first quantity port prevents the interference between downlink reference signal by orthogonal covering code.
In one embodiment, the step that the downlink reference signal corresponding to each port is mapped at least one resource element is specifically included：Based on power limit, determine that a resource element can be supported the maximum quantity of downlink reference signal；Downlink reference signal corresponding to second quantity port is mapped on a resource element, wherein second quantity is less than or equal to the maximum quantity.
In one embodiment, the type of the downlink reference signal is broadband user's DRS (Dedicated Reference Signal).
In one embodiment, the type of the downlink reference signal is narrow-band user DRS (Dedicated Reference Signal).
In one embodiment, when at least one of Physical Downlink Control Channel, physical down data channel is sent to first user end in the subframe that the base station is needed after, in present sub-frame a position indication information is sent to the first user end, for being indicated to the first user end, in subframe after, position and the position of resource subregion for demodulating at least one resource element corresponding to the downlink reference signal of at least one of the Physical Downlink Control Channel, physical down data channel；The resource element of at least one of Physical Downlink Control Channel, the physical down data channel of subframe after being wherein used for described in sending is located in the resource subregion；When the base station need not be after subframe in send Physical Downlink Control Channel, at least one of physical down data channel to first user end when, send a removing configured information to the first user end in present sub-frame.The scope of the subframe after wherein described is (i.e.：Which subframe after present sub-frame), by loading the control signaling of the position indication information can inform user terminal or be informed to user terminal in advance by physical layer signaling or high-level signaling.
In one embodiment, when present sub-frame is when sending at least one of Physical Downlink Control Channel, physical down data channel to first user end for the first time after base station end is broken or lost for the first time or in the data transmission, at least one resource element corresponding with the port at the first user end to be allocated in shared resource subregion；Wherein, position of the shared resource subregion in Resource Block is default, and is present in given sub-frame.
In one embodiment, the resource element for sending the Physical Downlink Control Channel is included when the downlink reference signal is used to demodulate Physical Downlink Control Channel, in the shared resource subregion；Include the resource element and the resource element for sending the physical down data channel for sending the Physical Downlink Control Channel when the downlink reference signal is used to demodulate Physical Downlink Control Channel and physical down data channel, in the shared resource subregion；Wherein, the downlink reference signal in the shared resource subregion is special user, or the non-wave beam forming of cell-specific or wave beam forming.
In one embodiment, when confirming that Physical Downlink Control Channel is lost, base station retransmits the position indication information.Wherein, by receiving the NACK signalings of user terminal, or time-out is occurred based on transmission lose confirming Physical Downlink Control Channel.
The second aspect of the disclosure provides a kind of method for being used in the user terminal of millimeter-wave systems and implementing downlink transfer, including：Downlink reference signal is obtained at least one resource element from resource subregion；Physical Downlink Control Channel and/or physical down data channel are demodulated with the downlink reference signal.
In one embodiment, the step of downlink reference signal is obtained at least one resource element from resource subregion specifically includes：When present sub-frame is when sending at least one of Physical Downlink Control Channel, physical down data channel to the user terminal for the first time after base station end is broken or lost for the first time or in the data transmission：By blind check, the downlink reference signal of the correspondence user terminal is obtained at least one resource element from shared resource subregion；Wherein, position of the shared resource subregion in the Resource Block is fixed；Or the positional information of the resource element from the broadcast singal of the base station end in acquisition present sub-frame corresponding to downlink reference signal, the downlink reference signal of present sub-frame is obtained based on the positional information.
In one embodiment, the receiving position configured information in present sub-frame, the position indication information is used to indicate, in subframe after, position and the position of resource subregion for demodulating at least one resource element corresponding to the downlink reference signal of at least one of the Physical Downlink Control Channel, physical down data channel；The resource element of at least one of Physical Downlink Control Channel, the physical down data channel of subframe after being wherein used for described in sending is located in the resource subregion.
In one embodiment, when the position indication information failure is received in present sub-frame, NACK signalings are sent to base station end, the position indication information is not properly received with to base station end instruction；And/or when the position indication information success is received in present sub-frame, ACK signalings are sent to base station end, have correctly received the position indication information with to base station end instruction.
In one embodiment, the position indication information is implemented to encode by the coded system of strong robustness, to ensure that the position indication information can correctly be transmitted with particular probability..
The third aspect of the disclosure provides a kind of device for being used to implement downlink transfer in the base station end of millimeter-wave systems, including：Determining unit, for determining downlink reference signal for each user terminal；Allocation unit, a port for being used to implement downlink transfer is distributed for the downlink reference signal for each user terminal；Map unit, for the downlink reference signal corresponding to each port to be mapped at least one resource element；Transmitter unit, for sending corresponding downlink reference signal at least one resource element.
The fourth aspect of the disclosure provides a kind of device for being used to implement downlink transfer in the user terminal of millimeter-wave systems, including：Receiving unit, for obtaining downlink reference signal at least one resource element from resource subregion；Demodulating unit, for demodulating Physical Downlink Control Channel and/or physical down data channel with the downlink reference signal.
Brief description of the drawings
The detailed description made to non-limiting example made with reference to the following drawings by reading, the other features, objects and advantages of the disclosure will become more apparent：
Fig. 1 shows the resource element distribution schematic diagram of broadband user's DRS (Dedicated Reference Signal) of the control channel of the one embodiment according to the disclosure；
Fig. 2 shows the resource element distribution schematic diagram of the narrow-band user DRS (Dedicated Reference Signal) of the control channel of the one embodiment according to the disclosure；
Fig. 3 shows the resource element distribution schematic diagram of the narrow-band user DRS (Dedicated Reference Signal) of the control channel according to another embodiment of the disclosure；
Fig. 4 shows the method flow diagram for being used to implement downlink transfer in the base station end of micron millimeter-wave systems of the one embodiment according to the disclosure；
Fig. 5 shows the method flow diagram for being used to implement downlink transfer in the user terminal of micron millimeter-wave systems of the one embodiment according to the disclosure；
Fig. 6 shows the apparatus module figure for being used to implement downlink transfer in the base station end of micron millimeter-wave systems of the one embodiment according to the disclosure；And
Fig. 7 shows the apparatus module figure for being used to implement downlink transfer in the user terminal of micron millimeter-wave systems of the one embodiment according to the disclosure.
Specific embodiment
In the specific descriptions of following preferred embodiment, by the accompanying drawing with reference to appended by constituting a disclosure part.Appended accompanying drawing has been illustrated by way of example the specific embodiment that can realize the disclosure.The embodiment of example is not intended as all embodiments of the limit according to the disclosure.It is appreciated that on the premise of without departing from the scope of the present disclosure, it is possible to use other embodiment, it is also possible to carry out structural or logicality modification.Therefore, specific descriptions below are simultaneously nonrestrictive, and the scope of the present disclosure is defined by the claims appended hereto.In addition, although the step of describing method in a particular order in specification, this does not require that or implies must perform these operations according to the particular order, or the operation having to carry out shown in whole could realize desired result, conversely, the step of describing can change execution sequence.Additionally or alternatively, it is convenient to omit some steps, multiple steps are merged into a step to perform, and/or a step is decomposed into execution of multiple steps.
We simply introduce inventive concept of the invention with reference to Fig. 1-3 first.Fig. 1-3 respectively illustrates the schematic diagram of resource area, and the transverse axis in the region represents time domain, and the longitudinal axis represents frequency, and wherein each grid is a resource element that can be used for implementing downlink transfer.
In the present invention, we prefer that following two designs for down control channel and user's DRS (Dedicated Reference Signal) of downstream data channel：1. broadband user's DRS (Dedicated Reference Signal), 2. narrow-band user DRS (Dedicated Reference Signal).
In the two schemes, based on the intercommunity of downstream transmission channel, can be by measuring up channel and estimation results calculate the precoding of downlink reference signal.Therefore we prefer that scheme be mainly used in time division multiplex system.As mentioned by many technical papers or report, time division multiplex has many advantages for millimeter-wave systems.In past 5G seminars, most companies all have agreed to and agree including Huawei, Nokia etc.：At least in the first stage of millimeter-wave systems deployment, time division multiplex is preferential for millimeter-wave systems.Uplink channel estimation is based on the detecting to uplink reference signals, for example, the interception reference signal in LTE system.Before Physical Downlink Control Channel is decoded, can simply implement the original allocation of the resource of uplink sounding reference signal and circular shift information.Then the re-optimization configuration after Physical Downlink Control Channel is decoded.
1. the transmission plan of broadband user's DRS (Dedicated Reference Signal)
Knowable to the name of broadband user's DRS (Dedicated Reference Signal), these reference signals are covered on whole frequency band.For the port of user terminal, beam-forming weights are identicals in whole wave band.Downlink reference signal after beam forming can be mapped in different resource element.For example, a port distributes a resource element, or multiple downlink reference signals can be mapped in a resource element that can implement many reference signal transmissions (yet with power limit, the quantity that the downlink reference signal of transmission is allowed in a resource element should also be properly restrained).Additionally, for user terminal, before Physical Downlink Control Channel is decoded, the allocated port number of user terminal and user terminal are configured to the information such as which port and should inform give the user terminal.
As shown in figure 1, by different beamforming vectors, Physical Downlink Control Channel and embedded downlink reference signal to different user end implement precoding.Our these reference signals after being pre-coded are called user's DRS (Dedicated Reference Signal).The advantage of user's DRS (Dedicated Reference Signal) is that the power for sending reference signal is more concentrated, and the interference to the reference signal at other users end is smaller.
There is shown herein three kinds of resource element distribution (or mapping) schemes of broadband user's DRS (Dedicated Reference Signal).
A) can be that the downlink reference signal one specific resource element of distribution after each precoding usually carries out downlink transfer in a kind of mode.
B) in a further mode of operation, as shown in Fig. 1 (left part), it can be downlink reference signal one resource of resource element size of distribution after each precoding, multiple downlink reference signals are combined, then the multiple downlink reference signals combined usually are transmitted by multiple resource elements, wherein, the interference between corresponding ports is eliminated between the multiple downlink reference signals combined by orthogonal covering codes (OCC).Due to distributing a resource for resource element size for each downlink reference signal, i.e.,：It is equivalent to each downlink reference signal and takes a resource element, therefore, compared with first way, downlink reference signal implements transmission again after combining can obtain the average value that downlink reference signal is measured on multiple resources.
C) in a further mode of operation, as shown in Fig. 1 (right part), multiple downlink reference signals can be sent in same resource element in the way of spatial reuse.Due to being mutually orthogonal between the downlink reference signal after precoding in identical resource element, therefore each user terminal can correctly receive the reference signal for pointing to their own from the resource element.In this approach, resource element can support that the quantity of downlink reference signal is limited by power requirement.
In these modes, the facilities of the port for distributing to each user terminal, base station can notify to give each user terminal in access procedure, afterwards if desired, the setting can be changed, and notify to give each user terminal.
In transmission, downlink reference signal implements transmission using the resource element being individually assigned to.
2. the transmission plan of narrow-band user DRS (Dedicated Reference Signal)
For narrowband systems, Physical Downlink Control Channel and physical down data channel can be demodulated by different downlink reference signals, it is also possible to be demodulated by identical downlink reference signal.Therefore, for both of these case, the transmission plan of narrow-band user DRS (Dedicated Reference Signal) has two ways.
1) in a kind of mode, as shown in Fig. 2 Physical Downlink Control Channel and physical down data channel are demodulated by different downlink reference signals.The Physical Downlink Control Channel of subframe is arranged in a resource subregion with the downlink reference signal for demodulating the Physical Downlink Control Channel.In the first access procedure of user terminal and base station end, the position of resource element corresponding to the Physical Downlink Control Channel of different user end/user's group in resource area can notify to give each user terminal in the following manner：1. broadcast system information is passed through；2. a public resource subregion is set, for each user terminal in the subregion the respective downlink reference signal of blind check, the region can be fixed Resource Block or center resources block, the public resource subregion is in given sub-frame, the given sub-frame can be each subframe, or by predetermined configurations or the selected subframe of given time domain order, such as, first subframe in even subframe, or every 5 subframes.The reference signal in the region can be：User is special, or the non-wave beam forming of cell-specific or wave beam forming, wherein, the reference signal of the proprietary non-wave beam forming of cell is most viable.
After initial resource sub-district domain information is obtained, user terminal can in this region find respective control signaling to each user terminal.Wherein, if base station also need to after subframe in send Physical Downlink Control Channel to user terminal, then the subframe after also having in the control signaling in present sub-frame is (for example：Next subframe or under several subframes) Physical Downlink Control Channel and corresponding downlink reference signal where resource subregion positional information.Resource sub-window position information includes the starting point and size of resource subregion.If sending Physical Downlink Control Channel to user terminal in the subframe that base station need not be after, there is a removing configured information, to indicate to send Physical Downlink Control Channel to the user terminal in the subframe that base station will not be after in control signaling so in present sub-frame.The scope of the subframe after wherein described is (i.e.：Which subframe after present sub-frame), by loading the control signaling of the position indication information can inform user terminal or be informed to user terminal in advance by physical layer signaling or high-level signaling.
In this approach, the mode of downlink reference signal distribution resource element can be any one in three kinds of modes described in broadband user's DRS (Dedicated Reference Signal), i.e.,：Each downlink reference signal uses a resource element using a resource element, multiple downlink reference signals using multiple resource elements or multiple downlink reference signals.
2) in a further mode of operation, as shown in figure 3, Physical Downlink Control Channel and physical down data channel are demodulated by identical downlink reference signal.The Physical Downlink Control Channel of subframe, physical down data channel, and demodulate the Physical Downlink Control Channel and the downlink reference signal of physical down data channel is arranged in a resource subregion.In the first access procedure of user terminal and base station end, the position of resource element corresponding to the Physical Downlink Control Channel and physical down data channel of different user end/user's group in resource area can notify to give each user terminal in the following manner：1. broadcast system information is passed through；2. a public resource subregion is set, and for each respective downlink reference signal of user terminal blind check, the region can be fixed Resource Block or center resources block.In given sub-frame, the given sub-frame can be each subframe, or the subframe selected by predetermined configurations or given time domain order, such as, first subframe in even subframe, or every 5 subframes to the public resource subregion.The reference signal in the region can be：User is special, or the non-wave beam forming of cell-specific or wave beam forming, wherein, the reference signal of the proprietary non-wave beam forming of cell is most viable.
After initial resource sub-district domain information is obtained, user terminal can in this region find respective control signaling or downlink data to each user terminal.Wherein, if sending Physical Downlink Control Channel and/or physical down data channel to user terminal in the subframe that base station also needs to after, then the positional information of the resource subregion where the Physical Downlink Control Channel and/or physical down data channel of the subframe after having in the control signaling or downlink data in present sub-frame and corresponding downlink reference signal.Resource sub-window position information includes the starting point and size of resource subregion.If sending Physical Downlink Control Channel and/or physical down data channel to user terminal in the subframe that base station need not be after, there is a removing configured information, to indicate to send Physical Downlink Control Channel and/or physical down data channel to the user terminal in the subframe that base station will not be after in control signaling so in present sub-frame.
Equally, in this approach, the mode of downlink reference signal distribution resource element can be any one in three kinds of modes described in broadband user's DRS (Dedicated Reference Signal), i.e.,：Each downlink reference signal uses a resource element using a resource element, multiple downlink reference signals using multiple resource elements or multiple downlink reference signals.
Based on foregoing invention design, we will be discussed in detail method of the present invention flow and device with reference to Fig. 4-7 below.
First, as shown in figs. 4 and 6, we are introduced in base station end for implementing the method and its device of downlink transfer.The device 600 for being used to implement downlink transfer in the base station end of millimeter-wave systems includes：First receiving unit 601, determining unit 602, allocation unit 603, map unit 604, the first transmitting element 605.Unit in the device 600 can be constituted by realizing the hardware module and/or logic circuit of corresponding function respectively, wherein, the annexation between unit is as shown in Figure 6.
In step S401, base station determines downlink reference signal for each user terminal.
Specifically, when base station will send Physical Downlink Control Channel and/or physical down data channel to user terminal, the first receiving unit 601 receives the uplink reference signals of each user terminal and sends into determining unit 602.Determining unit 602 measures analysis to the uplink reference signals of each user terminal, and the intercommunity based on downstream transmission channel, the precoding of the downlink reference signal of each user terminal is calculated according to analysis result, so that for each user terminal determines final downlink reference signal.Wherein, the type of the downlink reference signal can be broadband user's DRS (Dedicated Reference Signal) or narrow-band user DRS (Dedicated Reference Signal).Broadband user's DRS (Dedicated Reference Signal) refers to that reference signal is transmitted (i.e. on Whole frequency band：Just be transmitted at interval of a frequency range) user's DRS (Dedicated Reference Signal).And user's DRS (Dedicated Reference Signal) that narrow-band user DRS (Dedicated Reference Signal) refers to reference signal to be transmitted in specific resources region
In step S402, base station is that the downlink reference signal of each user terminal distributes a port for being used to implement downlink transfer.
Specifically, allocation unit 603 is each user terminal distributing a specific port, each port includes multiple antennas.Base station end sends downlink data or signaling using multiple antennas of the port to corresponding user terminal.
In step S403, base station is mapped to the downlink reference signal corresponding to each port at least one resource element.
Specifically, the downlink reference signal of user terminal needs usually to be sent to user terminal using resource element, map unit 604 each port (i.e., each user terminal) corresponding to downlink reference signal be mapped at least one resource element so that each port can using corresponding resource element send downlink reference signal.Need to confirm mapping mode and mapping position in mapping process, concrete scheme is as follows：
1. specific mapping mode has following three kinds：
1) downlink reference signal corresponding to the first quantity port is respectively mapped on the first quantity resource element.If the downlink reference signal of 4 ports needs transmission, then the downlink reference signal of each port takes a resource element.
2) downlink reference signal corresponding to the first quantity port is combined, and map on the first quantity resource element, wherein the downlink reference signal corresponding to the first quantity port prevents the interference between downlink reference signal by orthogonal covering code.Referring to Fig. 1 (left part), for example, if the downlink reference signal of 4 ports needs transmission, this 4 downlink reference signals are constituted 4 signals of resource element of an occupancy, wherein preventing mutual interference using orthogonal covering code between 4 downlink reference signals of port.
3) downlink reference signal corresponding to the second quantity port is mapped on a resource element.Referring to Fig. 1 (right part), by the quantity of downlink reference signal that can be sent simultaneously on each resource element by the downstream parameter signal in power limit, therefore resource element quantity no more than the maximum quantity that it can bear.
2. because downlink reference signal is used for demodulation Physical Downlink Control Channel and/or demodulation physical down data channel.Therefore, for the validity for ensureing to demodulate, the resource element that the resource element that downlink reference signal is mapped must be mapped with Physical Downlink Control Channel and/or physical down data channel is in same resource subregion.
3. it is pointed out that when downlink reference signal is narrow-band user DRS (Dedicated Reference Signal), because in each subframe, the position of the resource subregion where downlink reference signal and Physical Downlink Control Channel and/or physical down data channel is unfixed.Therefore, for narrow-band user DRS (Dedicated Reference Signal), the position of resource subregion needs to be notified to user terminal where the resource element of its mapping.
In one embodiment, as shown in Fig. 2 when downlink reference signal is narrow-band user DRS (Dedicated Reference Signal), and downlink reference signal is when be used to demodulate the situation of Physical Downlink Control Channel：
In the first transmission Physical Downlink Control Channel to user terminal after first or disconnected in the data transmission or loss, the downlink reference signal for demodulating the Physical Downlink Control Channel is mapped on the resource element in public resource subregion for base station.Then base station can inform the position of the user terminal resource element by broadcast message, or inform in advance the position of the user terminal public resource subregion, and so as to allow user terminal, blind check goes out the downlink reference signal in this region.
In addition when Physical Downlink Control Channel is sent to user terminal in the subframe that base station is needed after, in present sub-frame, base station sends a position indication information to the user terminal, for being indicated to the user terminal, in subframe after, for demodulate at least one resource element corresponding to the downlink reference signal of the Physical Downlink Control Channel position and the downlink reference signal where resource subregion position；The resource element of the Physical Downlink Control Channel of the subframe after being wherein used for described in sending also is located in the resource subregion.
When base station need not be after subframe in user terminal send Physical Downlink Control Channel when, in present sub-frame to the user terminal send one removing configured information, with indicate will not be after subframe in the user terminal send Physical Downlink Control Channel.
In one embodiment, as shown in figure 3, when downlink reference signal is narrow-band user DRS (Dedicated Reference Signal), and downlink reference signal is when be used to demodulating the situation of Physical Downlink Control Channel and physical down data channel：
In first transmission Physical Downlink Control Channel and the physical down data channel to user terminal after first or disconnected in the data transmission or loss, the downlink reference signal for demodulating the Physical Downlink Control Channel and physical down data channel is mapped on the resource element in public resource subregion for base station.Then base station can inform the position of the user terminal resource element by broadcast message, or inform in advance the position of the user terminal public resource subregion, and so as to allow user terminal, blind check goes out the downlink reference signal in this region.
In addition when Physical Downlink Control Channel and physical down data channel is sent to user terminal in the subframe that base station is needed after, in present sub-frame, base station sends a position indication information to the user terminal, for being indicated to the user terminal, in subframe after, for demodulate at least one resource element corresponding to the downlink reference signal of the Physical Downlink Control Channel and physical down data channel position and the downlink reference signal where resource subregion position；The Physical Downlink Control Channel of subframe and the resource element of physical down data channel after being wherein used for described in sending also are located in the resource subregion.When base station need not be after subframe in user terminal send Physical Downlink Control Channel, physical down data channel when, in present sub-frame to the user terminal send one removing configured information, with indicate will not be after subframe in the user terminal send Physical Downlink Control Channel, physical down data channel.
In step s 404, base station sends the downlink reference signal corresponding with resource element by the first transmitting element 605 at least one resource element.
Hereinafter, as best shown in figures 5 and 7, we are introduced in user terminal for implementing the method and its device of downlink transfer.The device 700 for being used to implement downlink transfer in the base station end of millimeter-wave systems includes：Second receiving unit 701, demodulating unit 702, acknowledgement unit 703, the second transmitting element 704.Unit in the device 700 can be constituted by realizing the hardware module and/or logic circuit of corresponding function respectively, wherein, the annexation between unit is as shown in Figure 7.
In step S501, user terminal obtains downlink reference signal by the second receiving unit 701 at least one resource element from resource subregion.
Specifically, when present sub-frame is when sending at least one of Physical Downlink Control Channel, physical down data channel to the user terminal for the first time after base station end is broken or lost for the first time or in the data transmission：1) user terminal obtains the downlink reference signal of the correspondence user terminal by blind check at least one resource element from shared resource subregion；Wherein, position of the shared resource subregion in the Resource Block is fixed and informs in advance to user terminal；Or 2) positional information of resource element in present sub-frame corresponding to downlink reference signal is obtained from the broadcast singal of the base station end, the downlink reference signal of present sub-frame is obtained based on the positional information.
If present sub-frame be not base station end it is first or after breaking in the data transmission or losing it is first when sending at least one of Physical Downlink Control Channel, physical down data channel to the user terminal：Position indication information is obtained in previous subframe, the position indication information is used to indicate, in present sub-frame, position and the position of resource subregion for demodulating at least one resource element corresponding to the downlink reference signal of at least one of the Physical Downlink Control Channel, physical down data channel.
In step S502, demodulating unit 702 demodulates Physical Downlink Control Channel and/or physical down data channel with the downlink reference signal.
If additionally, when receiving the position indication information in present sub-frame and failing, also including step S503.In step S503, NACK signalings are sent to base station end, the position indication information is not properly received with to base station end instruction.When the position indication information success is received in present sub-frame, also including step S503 '.In step S503 ', ACK signalings are sent to base station end, the position indication information is had correctly received with to base station end instruction
Although the device 600 and device 700 of the example are illustrated in figs. 6 and 7, one or more units illustrated in Fig. 6 and 7 can be merged, separate, rearrange, omit, remove and/or be implemented by any way.Further, the unit of example can be realized by any combination of hardware, software, firmware and/or hardware, software and/or firmware.More generally, any one in the said units of example can be by one or more circuits, programmable processor, application specific integrated circuit (ASIC), and programmable logic device (PLD) and/or field programmable logic device (FPLD) etc. are realized.
It is obvious to a person skilled in the art that the disclosure is not limited to the details of above-mentioned one exemplary embodiment, and in the case of the spirit or essential attributes without departing substantially from the disclosure, can in other specific forms realize embodiment of the disclosure.Therefore, from the point of view of anyway, embodiment all should be regarded as exemplary, and be nonrestrictive.Additionally, it will be evident that " including " word is not excluded for other elements and step, and wording " one " is not excluded for plural number.The multiple element stated in device claim can also be realized by an element.The first, the second grade word is used for representing title, and is not offered as any specific order.
Claims (16)
1. a kind of method for being used to implement downlink transfer in the base station end of millimeter-wave systems, wraps
Include：
For each user terminal determines downlink reference signal；
For the downlink reference signal of each user terminal distributes an end for being used to implement downlink transfer
Mouthful；
Downlink reference signal corresponding to each port is mapped at least one resource element；
Corresponding downlink reference signal is sent at least one resource element.
2. method according to claim 1, wherein the descending ginseng corresponding to each port
The step that signal is mapped at least one resource element is examined to specifically include：
Downlink reference signal corresponding to first quantity port is respectively mapped to described first
On quantity resource element.
3. method according to claim 1, wherein the descending ginseng corresponding to each port
The step that signal is mapped at least one resource element is examined to specifically include：
Downlink reference signal corresponding to first quantity port is combined, and is mapped to
On the first quantity resource element, wherein descending corresponding to the first quantity port
Reference signal prevents the interference between downlink reference signal by orthogonal covering code.
4. method according to claim 1, wherein the descending ginseng corresponding to each port
The step that signal is mapped at least one resource element is examined to specifically include：
Based on power limit, determine that a resource element can be supported the maximum of downlink reference signal
Quantity；
Downlink reference signal corresponding to second quantity port is mapped to a resource element
On, wherein second quantity is less than or equal to the maximum quantity.
5. according to any described method in claim 2 to 4, wherein the descending reference is believed
Number type be broadband user's DRS (Dedicated Reference Signal).
6. according to any described method in claim 2 to 4, wherein the descending reference is believed
Number type be narrow-band user DRS (Dedicated Reference Signal).
7. method according to claim 6, wherein also include,
In the base station needs subframe after physical down control is sent to first user end
When at least one of channel processed, physical down data channel, to described in present sub-frame
One user terminal sends a position indication information, for being indicated to the first user end,
In subframe afterwards, for demodulating the Physical Downlink Control Channel, physical down data channel
At least one of downlink reference signal corresponding at least one resource element position with
And the position of resource subregion；The physical down control of the subframe after being wherein used for described in sending
The resource element of at least one of channel, physical down data channel is located at the resource sub-district
In domain；
When the base station need not be after subframe in first user end send physical down
When at least one of control channel, physical down data channel, to described in present sub-frame
First user end sends a removing configured information；
The scope of the subframe after wherein described, by the control for loading the position indication information
Signaled user terminal or informed to user in advance by physical layer signaling or high-level signaling
End.
8. method according to claim 6, wherein also including
When present sub-frame be base station end it is first or after breaking in the data transmission or losing it is first to
First user end sends at least one of Physical Downlink Control Channel, physical down data channel
When, at least one resource element corresponding with the port at the first user end is allocated in shared
Resource subregion in；
Wherein, position of the shared resource subregion in Resource Block is default, and
It is present in given sub-frame.
9. method according to claim 8, wherein
It is described shared when the downlink reference signal is used to demodulate Physical Downlink Control Channel
Include the resource element for sending the Physical Downlink Control Channel in resource subregion；
When the downlink reference signal is used to demodulate Physical Downlink Control Channel and physical down number
It is believed that including during road, in the shared resource subregion for sending the physical down control
The resource element of channel and the resource element for sending the physical down data channel；
Wherein, the downlink reference signal in the shared resource subregion is special user
, or the non-wave beam forming of cell-specific or wave beam forming.
10. a kind of method for being used to implement downlink transfer in the user terminal of millimeter-wave systems, wraps
Include：
Downlink reference signal is obtained at least one resource element from resource subregion；
Physical Downlink Control Channel and/or physical down data are demodulated with the downlink reference signal
Channel.
11. methods according to claim 10, wherein from resource subregion at least one
The step of downlink reference signal is obtained on individual resource element specifically includes：When present sub-frame is base station
End is first after breaking or lose for the first time or in the data transmission to be sent under physics to the user terminal
When at least one of row control channel, physical down data channel：
By blind check, obtain right at least one resource element from shared resource subregion
Answer the downlink reference signal of the user terminal；Wherein, the shared resource subregion is described
Position in Resource Block is fixed；Or
Downlink reference signal institute is right during present sub-frame is obtained from the broadcast singal of the base station end
The positional information of the resource element answered, the descending reference of present sub-frame is obtained based on the positional information
Signal.
12. methods according to claim 10, also include：
The receiving position configured information in present sub-frame, the position indication information is used to indicate,
In subframe after, for demodulating the Physical Downlink Control Channel, physical down data letter
The position of at least one resource element corresponding to the downlink reference signal at least one of road
With the position of resource subregion；The physical down control of the subframe after being wherein used for described in sending
The resource element of at least one of channel, physical down data channel is located at the resource sub-district
In domain.
13. methods according to claim 12, also include：
When the position indication information failure is received in present sub-frame, sent to base station end
NACK signalings, are believed with being not properly received the position instruction to base station end instruction
Breath；And/or
When the position indication information success is received in present sub-frame, sent to base station end
ACK signalings, the position indication information is had correctly received with to base station end instruction.
14. methods according to claim 12, also include：
The position indication information is implemented to encode by the coded system of strong robustness, to ensure
The position indication information can correctly be transmitted with particular probability.
A kind of 15. devices for being used to implement downlink transfer in the base station end of millimeter-wave systems, bag
Include：
Determining unit, for determining downlink reference signal for each user terminal；
Allocation unit, distributing one for the downlink reference signal for each user terminal is used to implement
The port of downlink transfer；
Map unit, for the downlink reference signal corresponding to each port to be mapped at least one
On individual resource element；
Transmitter unit, for sending corresponding descending at least one resource element
Reference signal.
A kind of 16. devices for being used to implement downlink transfer in the user terminal of millimeter-wave systems, bag
Include：
Receiving unit, for obtaining descending at least one resource element from resource subregion
Reference signal；
Demodulating unit, for the downlink reference signal demodulate Physical Downlink Control Channel and/
Or physical down data channel.
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| WO2019218296A1 (en) * | 2018-05-17 | 2019-11-21 | Qualcomm Incorporated | Ue specific beamforming for narrowband communications |
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