CN111316572B - Method and communication device for transmitting and receiving multicast beams in a telecommunication network - Google Patents
Method and communication device for transmitting and receiving multicast beams in a telecommunication network Download PDFInfo
- Publication number
- CN111316572B CN111316572B CN201780096613.1A CN201780096613A CN111316572B CN 111316572 B CN111316572 B CN 111316572B CN 201780096613 A CN201780096613 A CN 201780096613A CN 111316572 B CN111316572 B CN 111316572B
- Authority
- CN
- China
- Prior art keywords
- base station
- reference beams
- received
- channel information
- beams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A base station for transmitting multicast beams in a telecommunication network is proposed. The base station is configured to: transmitting a plurality of reference beams (121, 122, 123, 124, 125, 126, 127), wherein each reference beam of the plurality of reference beams (121, 122, 123, 124, 125, 126, 127) is associated with an index; receiving channel information associated with a subset of the transmitted reference beams from a set of user equipment (150, 151, 152); -transmitting a multicast beam (140) to said group of user equipments (150, 151, 152) based on said received channel information.
Description
Technical Field
The present application relates generally to the field of telecommunication network technology. In particular, the present application relates to a base station for transmitting a multicast beam to a group of user equipments in a telecommunication network and to a User Equipment (UE) for receiving a multicast beam from a base station in a telecommunication network. The application further relates to a method at a base station for transmitting a multicast beam to a group of user equipments in a telecommunication network and to a method at a user equipment for receiving a multicast beam from a base station in a telecommunication network. The application also relates to a base station in a telecommunication network.
Background
Multicasting is used in an application scenario where communication involves the transmission of the same data to a group of users (e.g., infotainment or multimedia streaming, software update distribution). Without sharing the available resources among multiple unicast links, a single multicast link may be used to simultaneously transmit data to a group of users on the same resource. Furthermore, the base station will be equipped with multiple antennas. In this case, multicasting may be combined with beamforming.
Multicast beamforming is mainly implemented under theoretical view in the literature, especially based on mathematical methods. These methods are typically developed under the implicit assumption of perfect available channel information. Furthermore, due to the channel information reported from all user equipments, the proposed solution has the disadvantage of relying on a huge amount of computation, multiple iterative algorithms and a large overhead. In current data multicast standards, particularly evolved multimedia broadcast multicast service (evolved multimedia broadcastmulticast service; eMBMS for short) or single cell point-to-multipoint (single cell point to multipoint; SC-PTM for short), multicast beamforming is not used for directional transmission to a group of users.
Multicast beamforming relies on channel information that is fed back by a User Equipment (UE) to a Base Station (BS). Based on the signals observed at the UE, the user equipment typically returns its feedback explicitly or implicitly. Explicit feedback means that all or part of the channel information is fed back from the receiver to the transmitter. The disadvantage of explicit feedback is that a large amount of feedback resources are required, especially for "massive MIMO" channels with many antennas. A disadvantage of explicit feedback of all channel information, in particular channel state information, is that the feedback channel between the user equipment and the base station requires a large bandwidth.
Implicit feedback means that the user equipment feeds back the index (precoding matrix indicator, abbreviated PMI) of the recommended precoder selected from the known codebook. Implicit feedback of channel information, in particular CSI feedback, is not applicable for forming a multicast beam to a group of user equipments, since the multicast beam depends on more than one channel information feedback. The assumption of selecting a user equipment specific precoder is invalid. Thus, explicit channel information is required to create the multicast beam.
Currently, LTE architecture for multicast such as SC-PTM or eMBMS includes a large number of nodes, enabling multicast to achieve high reliability low delay services (ultra-reliable and low latency communications, abbreviated URLLC) between immediately adjacent vehicles. A disadvantage of this complex signalling architecture is that transmission delay is increased. Thus, current LTE multicast technology is not applicable to the upcoming URLLC multicast service.
Finally, the new 5G technology will be used in parallel with existing 4G or LTE technology, especially within the bandwidth of the LTE component carrier. The disadvantage of using the same bandwidth is that interference problems can increase.
Disclosure of Invention
Now that the above drawbacks and problems have been recognized, the present application aims to improve the prior art, in particular V2X multicast technology over Uu interfaces. In particular, it is an object of the present application to provide a base station, a user equipment and a method to further improve signal-to-noise ratio (SNR), reduce interference and advantageously utilize multicast beamforming.
The above object is achieved by the features in the independent claims. Other embodiments of the application are presented in the dependent claims, the description and the drawings.
According to a first aspect, the present application relates to a base station for transmitting a multicast beam to a group of user equipments in a telecommunication network. The base station includes an antenna array, and the base station is configured to: transmitting a plurality of reference beams, wherein each reference beam of the plurality of reference beams is associated with an index; receiving channel information associated with a subset of the transmitted reference beams from the group of user equipment; and transmitting a multicast beam to the user equipment group based on the received channel information.
Thus, reporting the received channel information (in particular explicit channel information) has the following advantages: the reporting scheme does not make any assumptions about the user specific transmission or reception policy. The advantage is that with a fixed DFT (discrete fourier transform) beam grid, the received channel information can be used flexibly and efficiently for multicast beamforming. This is not the case for individual users. The reference signals of the reference beam are not specific to the user equipment but to the beam. Thus, the received channel information is available to all user equipments. Furthermore, this situation allows a large number of user equipments to be used.
According to a first implementation form of the base station according to the first aspect, the base station is configured to send the received channel information to another base station.
Thus, the other base station uses the received channel information to match its multicast beam to the group of user equipments.
Alternatively, the forwarded channel information may be used by the base station to prioritize URLLC service in addition to matching multicast beams, avoiding interference to user equipment connected to the base station.
According to a second implementation form of the base station according to the first aspect, the base station and the further base station are part of a single frequency network, the base station further being arranged to send the received channel information and data to the further base station.
Thus, the base station and the further base station can transmit multicast data to user equipments in the coverage area of the telecommunication network of both base stations using beams jointly or simultaneously.
According to a third implementation form of the base station of the first aspect, the base station is further configured to receive from the user equipment other channel information associated with a subset of other reference beams; and transmitting a multicast beam to the user equipment group based on the received channel information and the received other channel information.
Thus, the advantage of transmitting other channel information is that the base station may transmit the other channel information to the other base station, wherein the other channel information comprises information about interference reference signals of other reference beams, thereby adjusting the beam of the other base station.
According to a fourth implementation form of the base station according to the first aspect, the base station is further configured to send the received channel information to another base station, thereby adjusting a signal sent by the other base station.
Forwarding the received channel information is thus advantageous in that it can be used to reduce interference between the transmit beams of the base stations in the telecommunication network. Therefore, this has the advantage that the user equipment (in particular for the group of user equipments) has a better SINR and thus a more reliable transmission.
According to a fifth implementation form of the base station according to the first aspect, the channel information comprises phase information, amplitude information and an index of the reference beam.
Thus, the received channel information does not include channel information related to the user-specific transmission policy. The advantage of the channel information is that it is available to a group of user equipments, in particular each user equipment of a group of user equipments.
In particular, the phase information comprises a relative phase shift between reference beams measured with respect to a certain reference phase and belonging to the same base station.
According to a sixth implementation form of the base station according to the first aspect, the base station is further configured to send the multicast beam in the following manner: calculating the antenna weight w of the antenna array n Wherein the antenna weight w n Based on a transformation algorithm associated with a subset of the transmitted reference beams; based on the calculated antenna weights w of the antenna array n The multicast beam is formed.
The base station is thus advantageously adapted to multicast beams to improve the signal quality of each user equipment of the multicast group.
According to a second aspect, the application relates to a method for transmitting a multicast beam to a group of user equipments in a telecommunication network, the method being for a base station. The method comprises the following steps: transmitting a plurality of reference beams, wherein each reference beam of the plurality of reference beams is associated with an index; receiving channel information associated with a subset of the transmitted reference beams from the group of user equipment; and transmitting a multicast beam to the user equipment group based on the received channel information.
Thus, reporting the received channel information has the following advantages: the reporting scheme does not make any assumptions about the user specific transmission or reception policy. The advantage is that with a fixed DFT (discrete fourier transform) beam grid, the received channel information can be used more flexibly and efficiently for multicast beamforming. This is not the case for individual users. The reference signals of the reference beam are not specific to the user equipment but to the beam. Thus, the received channel information is available to all user equipments. Furthermore, this situation allows a large number of user equipments to be used.
According to a first implementation of the method according to the second aspect, the method further comprises the steps of: and transmitting the received channel information to another base station.
Thus, the other base station uses the received channel information to match its multicast beam to the group of user equipments.
Alternatively, the forwarded channel information may also be used by the base station to prioritize URLLC service, avoiding interference to user equipment connected to the base station.
According to a second implementation form of the method according to the second aspect, the base station and the further base station are part of a single frequency network, the method further comprising the steps of: and transmitting the received channel information and data to the other base station.
Thus, the base station and the further base station can jointly or simultaneously transmit multicast beams to user equipments in the coverage area of the telecommunication network of both base stations.
According to a third implementation form of the method according to the second aspect, the method further comprises the steps of: receiving, from the user equipment, other channel information associated with a subset of other reference beams; and transmitting a multicast beam to the user equipment group based on the received channel information and the received other channel information.
Thus, the advantage of transmitting other channel information is that the base station can transmit the other channel information to the other base station, wherein the other channel information comprises information about interfering other reference beams, thereby adjusting the beam of the other base station.
According to a fourth implementation form of the method according to the second aspect, the method further comprises the steps of: and transmitting the received channel information to another base station, thereby adjusting a signal transmitted by the other base station.
Forwarding the received channel information is thus advantageous in that it can be used to reduce interference between the transmit beams of the base stations in the telecommunication network. Therefore, this has the advantage that the user equipment (in particular for the group of user equipments) has a better SINR and thus a more reliable transmission.
According to a fifth implementation form of the method according to the second aspect, the channel information comprises phase information, amplitude information and an index of the reference beam.
Thus, the received channel information does not include channel information related to the user-specific transmission policy. The advantage of the channel information is that it is available to a group of user equipments, in particular each user equipment of a group of user equipments.
In particular, the phase information comprises a relative phase shift between reference beams measured with respect to a certain reference phase and belonging to the same base station.
According to a sixth implementation form of the method according to the second aspect, at the method steps: before transmitting the multicast beam, the method further comprises the steps of: calculating the antenna weight w of the antenna array n Wherein the antenna weight w n Based on a transformation algorithm associated with a subset of the transmitted reference beams; based on the calculated antenna weights w of the antenna array n The multicast beam is formed.
The base station is thus advantageously adapted to multicast beams to improve the received beam or signal quality of each user equipment of the multicast group.
According to a third aspect, the present application relates to a user equipment for receiving multicast beams from a base station in a telecommunication network. The user equipment is configured to receive a plurality of reference beams from the base station, wherein each reference beam of the plurality of reference beams is associated with an index; determining a condition of a channel associated with each of the received reference beams; selecting a subset of the received reference beams; channel information associated with the subset of the received reference beams is transmitted to the base station.
Therefore, reporting channel information from the user equipment to the base station has the following advantages: the reporting scheme does not make any assumptions about the user specific transmission or reception policy. The advantage is that the channel information can be used more flexibly and efficiently for multicast beamforming by a fixed DFT (discrete fourier transform) beam grid. This is not the case for individual users. The reference signals of the reference beam are not specific to the user equipment but to the beam. Thus, the channel information is available to all user equipments. Furthermore, this situation allows a large number of user equipments to be used.
According to a first implementation form of the user equipment according to the third aspect, the user equipment is further configured to select the subset of received reference beams by: determining whether the power level of the received reference beam is higher than a preset power level threshold.
The advantage of the selection is therefore that only the contributions of the received reference beams associated with the group of user equipments are transmitted to the base station. Furthermore, selecting a subset of the received reference beams advantageously reduces the required feedback resources.
According to a second implementation form of the user equipment according to the third aspect, the channel information comprises phase information, amplitude information and an index of the reference beam.
Thus, the transmitted channel information, including information for all other user equipments of the same group, may advantageously be used for the base station.
Preferably, the phase information comprises a relative phase shift between reference beams measured with respect to any reference phase and belonging to the same base station.
According to a third implementation form of the user equipment of the third aspect, the user equipment is further configured to receive a plurality of other reference beams from another base station, wherein each reference beam of the plurality of other reference beams is associated with an index; determining a condition of a channel associated with each of the received other reference beams; selecting a subset of the received other reference beams; other channel information associated with a subset of the received other reference beams is transmitted to the base station.
Therefore, the user equipment is beneficial to reducing interference and further improving the receiving quality of the multicast beam.
According to a fourth aspect, the application relates to a method for receiving a multicast beam from a base station in a telecommunication network, wherein the method is for a user equipment.
The method comprises the following steps: receiving a plurality of reference beams from the base station, wherein each reference beam of the plurality of reference beams is associated with an index; determining a condition of a channel associated with each of the received reference beams; selecting a subset of the received reference beams; channel information associated with the subset of the received reference beams is transmitted to the base station.
Therefore, reporting channel information from the user equipment to the base station has the following advantages: the reporting scheme does not make any assumptions about the user specific transmission or reception policy. The advantage is that the channel information can be used more flexibly and efficiently for multicast beamforming by a fixed DFT (discrete fourier transform) beam grid. This is not the case for individual users. The reference signals of the reference beam are not specific to the user equipment but to the beam. Thus, the channel information is available to all user equipments. Furthermore, this situation allows a large number of user equipments to be used.
According to a first implementation form of the method according to the fourth aspect, the method further comprises the step of selecting a subset of the received reference beams: determining whether the power level of the received reference beam is higher than a preset power level threshold.
The advantage of the selection is therefore that only the contributions of the received reference beams associated with the group of user equipments, in particular a group of user equipments, are transmitted to the base station. Furthermore, selecting a subset of the received reference beams advantageously reduces the required feedback resources.
According to a second implementation form of the method according to the fourth aspect, the channel information comprises phase information, amplitude information and an index of the reference beam.
Thus, the transmitted channel information, including information for all other user equipments of the same group, may advantageously be used for the base station.
Preferably, the phase information comprises a relative phase shift between reference beams measured with respect to any reference phase and belonging to the same base station.
According to a third implementation of the method of the fourth aspect,
the method further comprises the steps of: receiving a plurality of other reference beams from another base station, wherein each of the plurality of other reference beams is associated with an index; determining a condition of a channel associated with each of the received other reference beams; selecting a subset of the received other reference beams; other channel information associated with a subset of the received other reference beams is transmitted to the base station.
Thus, the user equipment will be beneficial to reduce interference and thereby improve its reception quality.
According to a fifth aspect, the application relates to a base station in a telecommunication network. The base station is configured to receive channel information from the base station according to a first implementation of the base station of the first aspect.
Thus, the base station matches its multicast beam with the group of user equipments.
According to a first implementation form of the base station of the fifth aspect, the base station is further configured to receive data from the base station according to the second implementation form of the base station of the first aspect and to send the received data on another multicast beam to the group of user equipments together with the base station according to the second implementation form of the base station of the first aspect.
Therefore, the signal to noise ratio of the user equipment in the user equipment group is remarkably improved.
According to a second implementation form of the base station according to the fifth aspect, the base station is further configured to adjust the signal according to the fourth implementation form of the base station according to the first aspect to reduce interference to the multicast beam of the base station.
The forwarding channel information is thus advantageous in that it can be used to reduce interference between the transmit beams of the base stations in the telecommunication network. Therefore, this has the advantage that the user equipment (in particular for the group of user equipments) has a better SINR and thus a more reliable transmission.
More specifically, it should be noted that the above means can be implemented based on discrete hardware circuits having discrete hardware components, integrated chips or chip module arrangements, or based on signal processing devices or chips controlled by software routines or programs stored in a memory and written on a computer readable medium or downloaded from a network, such as the internet.
It is to be further understood that the preferred embodiments of the application may also be the dependent claims or any combination of the embodiments described above in connection with the respective independent claims.
These and other aspects of the application will be apparent from, and elucidated with reference to, the embodiments described hereinafter.
Drawings
The aspects of the application and the manner of attaining them will be elucidated with reference to the embodiments described hereinafter, taken in conjunction with the accompanying drawings, wherein:
fig. 1a shows a base station of a multicast group comprising an antenna array and user equipment according to the present application;
FIG. 1b illustrates channel information reporting according to another embodiment of the present application;
fig. 2 illustrates an application scenario regarding multicast transmission of V2X communication services over a combined area according to another embodiment of the present application;
fig. 3 shows a flow diagram for a multicast collaboration model according to another embodiment of the application shown in fig. 2.
Detailed Description
Fig. 1a shows a base station 100 for transmitting multicast beams to a set of user equipments 150, 151 and 152 in a telecommunication network. The base station 100 comprises an antenna array 110 and the base station 100 is for: a plurality of reference beams 121, 122, 123, 124, 125, 126, and 127 are transmitted, wherein each of the plurality of reference beams 121, 122, 123, 124, 125, 126, and 127 is associated with an index. The base station 100 receives channel information associated with a subset of the transmitted reference beams from the set of user equipments 150, 151 and 152 and transmits a multicast beam 140 to the set of user equipments 150, 151 and 152 based on the received channel information.
The user equipments 150, 151 and 152 form a group, in particular a multicast group. The reference beams 121, 122, 123, 124, 125, 126 and 127 are associated with indexes for efficient identification, in particular for estimating channel information of the user equipments 150, 151 and 152.
The base station 100 receives channel information from each user equipment of the user equipment group. The channel information includes a complex scalar value for each beam, particularly the phase information, amplitude information and index of reference beams 121, 122, 123, 124, 125, 126 and 127 (particularly those beams that contribute significantly to the channel).
One or more phase information is measured with respect to a reference that is common to all beams belonging to the same base station. Assuming that orthogonal beams are used in the discrete fourier transform (discrete Fourier transform, abbreviated as DFT), knowing the phase and amplitude of all beam grid (GoB) reference beams is equivalent to ideal channel information. The base station 100 and the user equipments 150, 151 and 152 use the following information: some of the GoB beams are directed in "other directions", or are not directed to user devices 150, 151 and 152 and are not directed to spatial channels or beams of the respective user devices 150, 151 and 152.
This advantageously reduces complexity or dimension because only channel information about a subset of the reference beams 121, 122, 123, 124, 125, 126, and 127 will be fed back or transmitted from each user device 150, 151, or 152 to the base station 100. Thus, the base station 100 receives channel information without using user equipment specific channel information, in particular user equipment specific precoding techniques, and without making any assumptions about the user equipment specific transmission or reception strategy based on the subset of reference beams 121, 122, 123, 124, 125, 126 and 127.
Based on the received channel information, the base station can form a suitable (in particular adapted) multicast beam 140, thereby improving the signal-to-noise ratio of the group of user equipments 150, 151 and 152.
The base station 100 transmits the multicast beam 140 to the user equipments 150, 151 and 152, in particular for providing a high reliability low latency communication service to vehicles as V2X service.
According to one embodiment of the application, the antenna weights or antenna coefficients are determined by the base station 100 based on an algorithm. The user equipment 150, 151 and 152 only send the phase information, amplitude information and index associated with the strongest beam to the base station 100. Based on these indices, amplitudes and phases, the base station 100 determines a channel matrix H between M reference beams and K user equipments. The effective channel matrix H is used to model the combined effect of the transmitted reference beam and the propagation channel. Furthermore, U is set to a reduced channel matrix defined similarly to H based on the subset of reference beams. An entry is obtained from feedback of the user devices 150, 151 and 152, wherein the feedback is an index about the reference beams 121, 122, 123, 124, 125, 126 and 127 and a phase and an amplitude of each reference beam of each user device. The entry with no feedback value available is set to zero because the contribution of the beam to the respective user equipment 121, 122, 123, 124, 125, 126 and 127 is insignificant.
The columns in H are weighted individually, which may optionally be done based on a max-min-SINR criterion, in particular using the reverse path gain concept. This means that the weaker the channel, the stronger the weight. Other weighting concepts are also possible.
By summing all columns, the vector u can be obtained.
U full Let it be the MxM DFT matrix, where each column corresponds to one beam, forming one grid of GoB beams. U is set to a reduced matrix containing only beams that contribute to a given group of users served by the multicast beam. Antenna weight w n Is the product w=u.
Fig. 1b shows channel information reporting according to another embodiment of the application. Fig. 1b shows user equipments 150, 151 and 152, a base station 100 and another base station 180 in a telecommunication network. The base station 100 and the further base station 180 are part of a single frequency network in a telecommunication network.
A single frequency network or SFN is a broadcast or multicast telecommunication network in which several transmitters or base stations 100 and 180 simultaneously transmit the same signal on the same frequency channel, in particular simultaneously transmitting multicast beams to a group of user equipments 150, 151 and 152.
The user equipment 150, 151 and 152 is further configured to receive a plurality of other reference beams 131, 132 and 133 from another base station 180, wherein each reference beam of the plurality of other reference beams 131, 132 and 133 is associated with an index; determining a condition of a channel associated with each of the received other reference beams 131, 132, and 133; selecting a subset of the received other reference beams; other channel information associated with a subset of the received other reference beams is transmitted to the base station 100.
The base stations 100 and 180 include an antenna array 110 and an antenna array 190, respectively. The base stations 100 and 180 are respectively configured to: a plurality of reference beams 121, 122, 123, 124, 125, 126, and 127 and a plurality of reference beams 131, 132, and 133 are transmitted, wherein each reference beam of the plurality of reference beams 121, 122, 123, 124, 125, 126, 127, 131, 132, and 133 is associated with an index. The base station 100 receives channel information associated with a subset of transmitted reference beams 121, 122, 123, 124, 125, 126, 127, 131, 132, and 133 from a set of user equipment 150, 151, and 152 and transmits a multicast beam 140 to the set of user equipment 150, 151, and 152 based on the received channel information.
The user equipments 150, 151 and 152 form a group, in particular a multicast group. The reference beams 121, 122, 123, 124, 125, 126, 127, 131, 132 and 133 are associated with indexes for efficient identification, in particular for estimating channel information of the user equipments 150, 151 and 152.
In the embodiment shown in fig. 1b, the base station 100 is configured to send the received channel information and data to another base station 180. Optionally, the channel information is via an X of a telecommunications network N Interface 170.
Another base station 180 is arranged to receive data from the base station 100. In this embodiment, another base station 180, in conjunction with the base station 100, transmits data received on another multicast beam 160 to the group of user devices 150, 151 and 152. Optionally, another base station 180 directs its multicast beam 160 to other user devices in a different geographical area of the single frequency network.
Fig. 2 illustrates an application scenario regarding multicast transmission of V2X communication services over a combined area according to another embodiment of the present application.
In this embodiment, fig. 2 shows a 5G application scenario, or new wireless as it is also called, for providing high reliability low latency communication (URLLC) services for a group of vehicles 250 and 251 based on multicast beamforming.
A Single Frequency Network (SFN) of a plurality of base stations 200, 280 and 290 is created. The base stations 200, 280 and 290 simultaneously multicast information to a plurality of vehicles 250, 251, 252, 253, 254 and 255 within a geographic area via multicast beams 240, 260 and 295. The base stations 200 and 290 deliver localized URLLC services to groups of vehicles 250 and 251 in the coverage area of the associated base station.
The base station 280 is located in a 4G telecommunications network. The 4G network also includes a multimedia broadcast multicast service gateway 285, a broadcast multicast service center 286, and a V2X server 287.
According to the application, a 5G telecommunications network provides localized URLLC multicast data transmission according to multicast beamforming.
Channel information and data or information are exchanged between base stations 200 and 290 and another base station 280 via an Xn interface 270.
This has the following advantages: the base stations 200, 280 and 290 are capable of simultaneously transmitting the same signals to the vehicles 250, 251, 252, 253 and 254 on their multicast beams 240, 260 and 295, respectively. In addition, as described above, transmitting channel information and data advantageously supports selectively providing services to vehicles that are proximate to the base stations 200 and 290 as well as those that are remote from the base stations.
In another embodiment of the present application, or, transmitting channel information only from base stations 200 and 290 to another base station may be used to reduce interference to beams from another base station 280. This may be achieved by transmitting channel information, in particular the phase, amplitude and index of the interfering beam, to the other base station 280 or 290.
Accordingly, based on the received channel information, the antenna weights of the other base station 280 are adjusted so as to suppress the beam direction to the user of the base station 200 or 290, in particular by using a zero forcing or MMSE type MIMO base station.
This also has the following advantages: the priority of the URLLC service provided by the base stations 200 and 290 is compared with the priority of the service of the other base station 280. Thus, the vehicle groups or user equipments 250 and 251 have a better SINR and thus a more reliable communication link.
In particular, in the present embodiment, the base station 200 or 290 in fig. 2 provides URLLC services by transmitting multicast beams to the sets of vehicles 250 and 251 without involving many network elements or entities in the telecommunication network, in particular other base stations, signaling gateway SGW, packet data gateway PGW or V2X application servers, etc. The reduction of involved network elements and network entities has the advantage of significantly reduced latency.
Fig. 3 shows a flow diagram for a multicast collaboration model according to another embodiment of the application shown in fig. 2. Fig. 3 shows a telecommunications network comprising a base station 300 and another base station 380. As described above, both base stations 300 and 380 are part of a single frequency network. Fig. 3 also shows a set of user devices 350, 351 and 352 and user devices 353, 354 and 355.
In step 301 of the flowchart, the base station 300 transmits a plurality of reference signals or beams, also referred to as CSI-RS, to each of the plurality of reference signals associated with the index.
In step 302, each of the user equipments 350, 351 and 352 determines the condition of the channel associated with each received reference signal, in particular the phase information, amplitude and index of the reference signal. Each user equipment 350, 351 or 352 selects a subset of the received reference signals.
In step 303, each user equipment 350, 351 or 352 transmits channel information associated with a subset of the received reference signals to the base station 300.
In step 304, the base station 300 determines antenna weights for an antenna array in the base station 300 based on the beam grid concept described above by means of the subset of reference signals.
In step 305, the base station 300 transmits a multicast signal or a multicast beam, in particular a URLLC multicast signal, to the user equipments 350, 351 and 352 or to a vehicle comprising the user equipments 350, 351 and 352, thereby enabling further processing of the user equipments 350, 351 and 352.
In step 306, the base station 300 passes X n The interface transmits the received channel information and data to the other base station 380, thereby enabling further processing of the other base station 380, in particular forwarding the data to the localized multimedia broadcast multicast service entity 390.
In step 307, the further base station 380 sends multicast data signals to other user equipments 353, 354 and 355 within the network coverage area of the further base station 380.
While the application has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. The application is not limited to the disclosed embodiments. Other modifications will be apparent to persons skilled in the art from reading this disclosure. Such modifications may involve other features which are already known in the art and which may be used instead of or in addition to features already described herein.
The application is described herein in connection with various embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. A computer program may be stored or distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the internet or other wired or wireless telecommunication systems.
While the application has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations of the application can be made without departing from the spirit and scope of the application. The specification and drawings are to be regarded only as illustrative of the application as defined in the accompanying claims and any and all modifications, variations, combinations or equivalents thereof are contemplated as falling within the scope of the present specification.
The present application relates to the sponsorship of the european union horizon 2020 research and innovation program under the project accepted license agreement No. 760809.
Claims (24)
1. A base station (100) for transmitting multicast beams to a group of user equipments (150, 151, 152) in a telecommunication network, characterized in that,
the base station (100) comprises an antenna array (110), wherein the base station (100) is configured to:
transmitting a plurality of reference beams (121, 122, 123, 124, 125, 126, 127), wherein each reference beam of the plurality of reference beams (121, 122, 123, 124, 125, 126, 127) is associated with an index;
receiving channel information associated with a subset of the transmitted reference beams from a group of user equipments (150, 151, 152); and
transmitting a multicast beam (140) to the group of user equipments (150, 151, 152) based on the received channel information;
wherein the channel information comprises phase information, amplitude information and an index of reference beams (121, 122, 123, 124, 125, 126, 127), the phase information comprising relative phase shifts measured with respect to a reference phase and belonging to the reference beams.
2. The base station (100) of claim 1, wherein,
the base station (100) is further configured to:
-transmitting said received channel information to another base station (180).
3. The base station (100) of claim 2, wherein,
-the base station (100) and the further base station (180) are part of a single frequency network; and
the base station (100) is further configured to:
-transmitting said received channel information and data to said another base station (180).
4. The base station (100) of claim 1, wherein,
the base station (100) is further configured to:
receiving from the user equipment (150, 151, 152) other channel information associated with a subset of other reference beams; and
-transmitting a multicast beam (140) to said group of user equipments (150, 151, 152) based on said received channel information and said received other channel information.
5. The base station (100) of claim 1, wherein,
the base station (100) is further configured to:
transmitting the received channel information to another base station (180) to adjust a signal transmitted by the other base station (180).
6. The base station (100) according to any of the claims 1 to 5, characterized in that,
the base station (100) is further configured to transmit the multicast beam in the following manner:
calculating antenna weights w of the antenna array (110) n Wherein, the method comprises the steps of, wherein,
the antenna weights w n Based on a transformation algorithm associated with a subset of the transmitted reference beams;
based on the calculated antenna weights w of the antenna array (110) n -forming the multicast beam (140).
7. Method for transmitting multicast beams to a group of user equipments (150, 151, 152) in a telecommunication network, characterized in that the method is used for a base station (100),
the method comprises the following steps:
transmitting a plurality of reference beams (121, 122, 123, 124, 125, 126, 127), wherein each of the plurality of reference beams is associated with an index;
receiving channel information associated with a subset of the transmitted reference beams from a group of user equipments (150, 151, 152); and
transmitting a multicast beam (140) to the group of user equipments (150, 151, 152) based on the received channel information;
wherein the channel information comprises phase information, amplitude information and an index of reference beams (121, 122, 123, 124, 125, 126, 127), the phase information comprising relative phase shifts measured with respect to a reference phase and belonging to the reference beams.
8. The method as recited in claim 7, further comprising:
-transmitting said received channel information to another base station (180).
9. The method of claim 8, wherein when the base station (100) and the further base station (180) are part of a single frequency network, the method further comprises:
-transmitting said received channel information and data to said another base station (180).
10. The method according to claim 9, wherein the method further comprises:
receiving from the user equipment (150, 151, 152) other channel information associated with a subset of other reference beams; and
-transmitting a multicast beam (140) to said group of user equipments (150, 151, 152) based on said received channel information and said received other channel information.
11. The method as recited in claim 7, further comprising:
transmitting the received channel information to another base station (180) to adjust a signal transmitted by the other base station (180).
12. The method according to any one of claims 7 to 11, further comprising:
the multicast beams are transmitted in the following manner:
calculating antenna weights w of an antenna array (110) n Wherein the antenna weight w n Based on a transformation algorithm associated with a subset of the transmitted reference beams;
based on the calculated antenna weights w of the antenna array (110) n -forming the multicast beam (140).
13. A user equipment (150, 151, 152) for receiving multicast beams from a base station (100) in a telecommunication network, characterized in that,
the user equipment (150, 151, 152) is configured to:
receiving a plurality of reference beams (121, 122, 123, 124, 125, 126, 127) from the base station (100), wherein each reference beam of the plurality of reference beams (121, 122, 123, 124, 125, 126, 127) is associated with an index;
determining a condition of a channel associated with each of the received reference beams (121, 122, 123, 124, 125, 126, 127);
selecting a subset of the received reference beams;
transmitting channel information associated with a subset of the received reference beams to the base station (100);
wherein the channel information comprises phase information, amplitude information and an index of reference beams (121, 122, 123, 124, 125, 126, 127), the phase information comprising relative phase shifts measured with respect to a reference phase and belonging to the reference beams.
14. The user equipment (150, 151, 152) according to claim 13, wherein the user equipment is further configured to select the subset of received reference beams by:
determining whether the power level of the received reference beam is higher than a preset power level threshold.
15. The user equipment (150, 151, 152) according to claim 13 or 14, wherein,
the user equipment (150, 151, 152) is further configured to:
receiving a plurality of other reference beams (131, 132, 133) from another base station (180), wherein each reference beam of the plurality of other reference beams (131, 132, 133) is associated with an index;
determining a condition of a channel associated with each of the received other reference beams (131, 132, 133);
selecting a subset of the received other reference beams;
other channel information associated with a subset of the received other reference beams is transmitted to the base station (100).
16. A method for receiving multicast beams from a base station (100) in a telecommunication network, characterized in that the method is for a user equipment (150, 151, 152),
the method comprises the following steps:
receiving a plurality of reference beams (121, 122, 123, 124, 125, 126, 127) from the base station (100), wherein each reference beam of the plurality of reference beams (121, 122, 123, 124, 125, 126, 127) is associated with an index;
determining a condition of a channel associated with each of the received reference beams (121, 122, 123, 124, 125, 126, 127);
selecting a subset of the received reference beams;
transmitting channel information associated with a subset of the received reference beams to the base station (100);
wherein the channel information comprises phase information, amplitude information and an index of reference beams (121, 122, 123, 124, 125, 126, 127), the phase information comprising relative phase shifts measured with respect to a reference phase and belonging to the reference beams.
17. The method of claim 16, further comprising selecting the subset of received reference beams by:
determining whether the power level of the received reference beam is higher than a preset power level threshold.
18. The method according to claim 16 or 17, further comprising:
receiving a plurality of other reference beams (131, 132, 133) from another base station (180), wherein each reference beam of the plurality of other reference beams (131, 132, 133) is associated with an index;
determining a condition of a channel associated with each of the received other reference beams (131, 132, 133);
selecting a subset of the received other reference beams;
other channel information associated with a subset of the received other reference beams is transmitted to the base station (100).
19. Another base station (180) in a telecommunication network, characterized in that,
the further base station (180) comprises an antenna array (190), wherein the further base station (180) is adapted to:
channel information is received from a base station (100) according to claim 2.
20. The base station of claim 19, wherein the base station,
the further base station (180) is further configured to:
a method according to claim 3, receiving data from said base station (100); and
the received data is transmitted together with the base station (100) on another multicast beam to a group of user equipments (150, 151, 152).
21. The base station of claim 19, wherein the base station,
the further base station (180) is further configured to:
the adjustment signal according to claim 5, thereby reducing interference to the multicast beam of the base station (100).
22. A communication device comprising a processor for executing a computer program stored in a memory, which when executed causes the device to perform the method of any one of claims 7 to 12.
23. A communications apparatus comprising a processor for executing a computer program stored in memory, which when executed causes the apparatus to perform the method of any one of claims 16 to 18.
24. A computer readable storage medium comprising a computer program which, when executed on a computer, causes
The method of any of claims 7 to 12 being performed; or alternatively
A method as claimed in any one of claims 16 to 18, performed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2017/079075 WO2019091586A1 (en) | 2017-11-13 | 2017-11-13 | Base station, user equipment and methods for sending and receiving a multicast beam in a telecommunications network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111316572A CN111316572A (en) | 2020-06-19 |
| CN111316572B true CN111316572B (en) | 2023-09-01 |
Family
ID=60388045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780096613.1A Active CN111316572B (en) | 2017-11-13 | 2017-11-13 | Method and communication device for transmitting and receiving multicast beams in a telecommunication network |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111316572B (en) |
| WO (1) | WO2019091586A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11564254B2 (en) * | 2020-04-10 | 2023-01-24 | Qualcomm Incorporated | Dynamic single frequency network area with listen before talk uncertainty |
| WO2022052027A1 (en) * | 2020-09-11 | 2022-03-17 | Qualcomm Incorporated | Beam indications for a single frequency network (sfn) |
| US11622242B2 (en) | 2021-03-03 | 2023-04-04 | Nokia Technologies Oy | Machine learning based multicast user grouping |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101755393A (en) * | 2007-08-10 | 2010-06-23 | 阿尔卡特朗讯 | A method of providing a broadcast or multicast service in a digital wireless communication network |
| WO2010096952A1 (en) * | 2009-02-27 | 2010-09-02 | 上海贝尔股份有限公司 | Cooperative beam forming method, device and base station |
| WO2015129310A1 (en) * | 2014-02-25 | 2015-09-03 | ソニー株式会社 | Apparatus and method |
| WO2017061813A1 (en) * | 2015-10-09 | 2017-04-13 | Samsung Electronics Co., Ltd. | Multicasting data in a wireless communications network |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8310975B2 (en) * | 2009-03-11 | 2012-11-13 | Nec Laboratories America, Inc. | Optimal beam scheduling for multicasting in wireless networks |
| US8724605B2 (en) * | 2010-07-29 | 2014-05-13 | Nec Laboratories America, Inc. | Multicast video and data delivery with beamforming antennas in indoor wireless networks |
| US9125074B2 (en) * | 2013-03-31 | 2015-09-01 | Xiao-an Wang | Coordinated multi-point transmission and multi-user MIMO |
-
2017
- 2017-11-13 CN CN201780096613.1A patent/CN111316572B/en active Active
- 2017-11-13 WO PCT/EP2017/079075 patent/WO2019091586A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101755393A (en) * | 2007-08-10 | 2010-06-23 | 阿尔卡特朗讯 | A method of providing a broadcast or multicast service in a digital wireless communication network |
| WO2010096952A1 (en) * | 2009-02-27 | 2010-09-02 | 上海贝尔股份有限公司 | Cooperative beam forming method, device and base station |
| WO2015129310A1 (en) * | 2014-02-25 | 2015-09-03 | ソニー株式会社 | Apparatus and method |
| WO2017061813A1 (en) * | 2015-10-09 | 2017-04-13 | Samsung Electronics Co., Ltd. | Multicasting data in a wireless communications network |
Non-Patent Citations (1)
| Title |
|---|
| ADAM: An Adaptive Beamforming System for Multicasting in Wireless LANs;Ehsan Aryafar等，;《IEEE/ACM Transactions on Networking》;20130122;第21卷(第5期);第I-VI节，图1-图4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019091586A1 (en) | 2019-05-16 |
| CN111316572A (en) | 2020-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11522597B2 (en) | Beam information feedback method and apparatus, and configuration information feedback method and apparatus | |
| US12003303B2 (en) | Feedback method and acquisition method for grouping indication information and device | |
| CN102405603B (en) | Method, device and system for beamforming with selective beam attenuation | |
| CN108476054B (en) | Method, base station and terminal equipment for transmitting beam identification information | |
| CN110034797B (en) | Precoding matrix indication feedback method and device | |
| CN107615856A (en) | The system and method that non-orthogonal multiple for multistage beam forming communicates | |
| US10952236B2 (en) | Beam selection systems and methods | |
| US9030949B2 (en) | Downlink PMI coordination based on base station antenna configuration | |
| EP2898720A1 (en) | Systems and methods for interference alignment in wi-fi | |
| JP6296165B2 (en) | Method for transmitting data between a user equipment and a base station in a wireless network | |
| US11464028B2 (en) | Apparatuses and methods for multi-user transmissions | |
| US11777558B2 (en) | Active set management for multiple-input multiple-output communications | |
| JP2013522960A (en) | Method for reducing interference in a communication system | |
| CN115836492A (en) | Signaling transmission with assistance of enhanced NR type II CSI feedback | |
| US9083490B2 (en) | Apparatus and method for mitigating inter-cell interference in multiple antenna system | |
| CN111316572B (en) | Method and communication device for transmitting and receiving multicast beams in a telecommunication network | |
| CN113016147A (en) | Coordinated multiple-input multiple-output downlink scheduling | |
| CN113169764A (en) | Non-coherent cooperative multiple-input multiple-output communication | |
| KR20150134520A (en) | Apparatus for processing transmission/reception signal for interference alignment in a mu-mimo interference broadcasting channel and method thereof | |
| JP2023546938A (en) | Port information signaling | |
| US11032841B2 (en) | Downlink active set management for multiple-input multiple-output communications | |
| CN110011706B (en) | Method and device for optimizing cooperative transmission | |
| CN109787727B (en) | Method and device in user equipment and base station for wireless communication | |
| KR101422026B1 (en) | A method for transmitting/receiving signal in a Multiple Input Multiple Output system | |
| KR102577484B1 (en) | Method and apparatus for transmitting and receiving signal for terminal-centric cooperative transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |