CN111316572A - Base station, user equipment, method for transmitting a multicast beam in a telecommunication network and method for receiving a multicast beam in a telecommunication network - Google Patents
Base station, user equipment, method for transmitting a multicast beam in a telecommunication network and method for receiving a multicast beam in a telecommunication network Download PDFInfo
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- CN111316572A CN111316572A CN201780096613.1A CN201780096613A CN111316572A CN 111316572 A CN111316572 A CN 111316572A CN 201780096613 A CN201780096613 A CN 201780096613A CN 111316572 A CN111316572 A CN 111316572A
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- 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
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- 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
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 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 transmitted reference beams from a set of user equipments (150, 151, 152); transmitting a multicast beam (140) to the group of user devices (150, 151, 152) based on the received channel information.
Description
Technical Field
The present invention generally relates to the field of telecommunications network technology. In particular, the present invention relates to a base station for transmitting a multicast beam to a group of user equipments in a telecommunication network and a User Equipment (UE) for receiving a multicast beam from the base station in the telecommunication network. Furthermore, the present invention relates to a method on the base station side for transmitting a multicast beam to a group of user equipments in a telecommunication network and a method on the user equipment side for receiving a multicast beam from a base station in a telecommunication network. The invention also relates to a base station in a telecommunication network.
Background
In an application scenario where the communication involves the transmission of the same data to a group of users (e.g. infotainment or multimedia streaming, software update distribution), multicast is used. Without sharing the available resources among multiple unicast links, data may be sent simultaneously to a group of users on the same resource using a single multicast link. Furthermore, the base station will be equipped with multiple antennas. In this case, multicast may be combined with beamforming.
Multicast beamforming is mainly implemented under theoretical perspectives in the literature, and is based in particular on mathematical methods. These methods are usually developed under the implicit assumption of perfectly available channel information. Furthermore, the proposed solution has the disadvantage of relying on huge computational effort, multiple iterative algorithms and large overhead due to the channel information reported from all user equipments. In current data multicast standards, especially evolved multimedia broadcast multicast service (eMBMS) or single cell point-to-multipoint (SC-PTM), multicast beamforming is not used for directional transmission to a group of users.
Multicast beamforming relies on channel information that is fed back to a Base Station (BS) by a User Equipment (UE). 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 channel information is fed back from the receiver to the transmitter. A 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 explicitly feeding back 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 an index (PMI) of a recommended precoder selected from a known codebook. Implicit feedback of channel information, in particular CSI feedback, is not suitable for forming a multicast beam to a group of user equipments, since a multicast beam depends on more than one channel information feedback. The assumption of selecting a precoder specific to the user equipment is not valid. Therefore, explicit channel information is required to create the multicast beam.
Currently, the LTE architecture for multicast such as SC-PTM or eMBMS includes a large number of nodes, so that multicast can achieve high-reliability and low-latency services between vehicles in close proximity (URLLC). This complex signaling architecture has the disadvantage of increasing transmission delay. Therefore, the current LTE multicast technology is not suitable for the upcoming URLLC multicast service.
Finally, the new 5G technology will be used in parallel with existing 4G or LTE technologies, especially within the bandwidth of the LTE component carrier. The disadvantage of using the same bandwidth is that interference problems are increased.
Disclosure of Invention
Now that the above disadvantages and problems have been recognized, the present invention is directed to improvements in the prior art, particularly the V2X multicast technology over Uu interfaces. In particular, it is an object of the present invention 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 of the independent claims. Further embodiments of the invention are presented in the dependent claims, the description and the drawings.
According to a first aspect, the present invention relates to a base station for transmitting multicast beams to a group of user equipments in a telecommunication network. The base station comprises 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 transmitted reference beams from the group of user equipments; transmitting a multicast beam to the group of user equipments 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 strategy. The advantage is that the received channel information can be flexibly and efficiently used for multicast beamforming with a fixed DFT (direct fourier transform) beam grid. This situation is not applicable to individual users. The reference signals of the reference beam are not user equipment specific but beam specific. 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 with the group of user equipments.
Alternatively, in addition to matching the multicast beam, the forwarded channel information may be used by the base station to prioritize URLLC services to avoid 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 another base station are part of a single frequency network, and the base station is further configured to send the received channel information and data to the another base station.
Thus, the base station and the further base station are able to transmit multicast data to user equipments in the coverage area of the telecommunication network of both base stations jointly or simultaneously using a beam.
In a third implementation form of the base station according to the first aspect, the base station is further configured to receive further channel information associated with a subset of further reference beams from the group of user equipments; transmitting a multicast beam to the group of user equipments based on the received channel information and the received other channel information.
Therefore, an advantage of transmitting the further channel information is that the base station may transmit the further channel information to the further base station, wherein the further channel information comprises information about interfering reference signals of further reference beams, thereby adjusting the beams of the further base station.
According to a fourth implementation form of the base station of the first aspect, the base station is further configured to send the received channel information to another base station, so as to adjust a signal sent by the another base station.
Forwarding the received channel information is therefore advantageous in that it can be used to reduce interference between the transmit beams of the base stations in the telecommunications network. This has the advantage, therefore, that the user equipment (especially for the group of user equipment) has a better SINR and therefore a more reliable transmission.
According to a fifth implementation form of the base station of 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 a user-specific transmission policy. The channel information has the advantage of being available to a group of user equipments, in particular to each user equipment of a group of user equipments.
In particular, the phase information comprises relative phase shifts 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 transmit the multicast beam in the following manner: calculating antenna weights w for the antenna arraynWherein the antenna weight wnIs based on a switching algorithm associated with a subset of the transmitted reference beams; based on the calculated antenna weights w of the antenna arraynForming the multicast beam.
The base station thus advantageously adapts the multicast beams so as to improve the signal quality of each user equipment of the multicast group.
According to a second aspect, the present invention relates to a method for transmitting a multicast beam to a group of user equipments in a telecommunication network, said 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 transmitted reference beams from the group of user equipments; transmitting a multicast beam to the group of user equipments based on the received channel information.
Therefore, reporting the received channel information has the following advantages: the reporting scheme does not make any assumptions about the user-specific transmission or reception strategy. The advantage is that the received channel information can be used more flexibly and efficiently for multicast beamforming with a fixed DFT (direct fourier transform) beam grid. This situation is not applicable to individual users. The reference signals of the reference beam are not user equipment specific but beam specific. 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 method of the second aspect, the method further comprises the steps of: transmitting the received channel information to another base station.
Thus, the other base station uses the received channel information to match its multicast beam with the group of user equipments.
Alternatively, the forwarded channel information may be used by the base station to prioritize URLLC services to avoid interference to user equipment connected to the base station.
According to a second implementation form of the method of 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: transmitting the received channel information and data to the other base station.
Thus, the base station and the further base station are able to transmit a multicast beam jointly or simultaneously to user equipments in the coverage area of the telecommunication networks of the two base stations.
According to a third implementation of the method according to the second aspect, the method further comprises the steps of: receiving other channel information associated with a subset of other reference beams from the group of user equipment; transmitting a multicast beam to the group of user equipments based on the received channel information and the received other channel information.
Thus, an advantage of transmitting the further channel information is that the base station may transmit the further channel information to the further base station, wherein the further channel information comprises information about interfering further reference beams, thereby adjusting the beams of the further base station.
According to a fourth implementation form of the method according to the second aspect, the method further comprises the steps of: 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 therefore advantageous in that it can be used to reduce interference between the transmit beams of the base stations in the telecommunications network. This has the advantage, therefore, that the user equipment (especially for the group of user equipment) has a better SINR and therefore 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 a user-specific transmission policy. The channel information has the advantage of being available to a group of user equipments, in particular to each user equipment of a group of user equipments.
In particular, the phase information comprises relative phase shifts between reference beams measured with respect to a certain reference phase and belonging to the same base station.
According to a sixth implementation of the method of the second aspect, in the method step: before transmitting the multicast beam, the method further comprises the steps of: calculating antenna weights w for the antenna arraynWherein the antenna weight wnIs based on a switching algorithm associated with a subset of the transmitted reference beams; based on the calculated antenna weights w of the antenna arraynForming the multicast beam.
The base station thus advantageously adapts the multicast beam in order to improve the reception beam or signal quality of each user equipment of the multicast group.
According to a third aspect, the present invention relates to a user equipment for receiving a multicast beam 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 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; transmitting channel information associated with the subset of the received reference beams to the base station.
Therefore, reporting the channel information from the ue to the base station has the following advantages: the reporting scheme does not make any assumptions about the user-specific transmission or reception strategy. The advantage is that the channel information can be used more flexibly and efficiently for multicast beamforming with a fixed DFT (direct fourier transform) beam grid. This situation is not applicable to individual users. The reference signals of the reference beam are not user equipment specific but beam specific. Therefore, the channel information is available to all user equipments. Furthermore, this situation allows a large number of user equipments to be used.
In a first implementation form of a user equipment according to the third aspect, the user equipment is further configured to select the subset of received reference beams by: determining whether a power level of the received reference beam is above a preset power level threshold.
The selection thus has the advantage that only the received contributions of the reference beams related to 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 of 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 relative phase shifts between reference beams measured with respect to arbitrary reference phases 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 of the plurality of other reference beams is associated with an index; determining a condition of a channel associated with each of the other received reference beams; selecting a subset of the received other reference beams; transmitting, to the base station, other channel information associated with the received subset of other reference beams.
Therefore, the user equipment is beneficial to reducing interference and improving the receiving quality of the multicast beam.
According to a fourth aspect, the present invention relates to a method for receiving multicast beams 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 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; transmitting channel information associated with the subset of the received reference beams to the base station.
Therefore, reporting the channel information from the ue to the base station has the following advantages: the reporting scheme does not make any assumptions about the user-specific transmission or reception strategy. The advantage is that the channel information can be used more flexibly and efficiently for multicast beamforming with a fixed DFT (direct fourier transform) beam grid. This situation is not applicable to individual users. The reference signals of the reference beam are not user equipment specific but beam specific. Therefore, the channel information is available to all user equipments. Furthermore, this situation allows a large number of user equipments to be used.
The first implementation form of the method according to the fourth aspect, the method further comprising the step of selecting a subset of the received reference beams: determining whether a power level of the received reference beam is above a preset power level threshold.
The selection thus has the advantage that only the received contributions of reference beams related to a 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 relative phase shifts between reference beams measured with respect to arbitrary reference phases 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 other received reference beams; selecting a subset of the received other reference beams; transmitting, to the base station, other channel information associated with the received subset of other reference beams.
Therefore, the user equipment is beneficial to reducing interference and improving the receiving quality of the user equipment.
According to a fifth aspect, the invention 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 the first implementation manner 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 manner of the base station of the first aspect, and send, together with the base station, the received data on another multicast beam to the user equipment group according to the second implementation manner 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 of the base station of the fifth aspect, the base station is further configured to adjust the signal so as to reduce interference to the multicast beam of the base station according to the fourth implementation of the base station of the first aspect.
Forwarding channel information is therefore advantageous in that it can be used to reduce interference between the transmit beams of a base station in a telecommunications network. This has the advantage, therefore, that the user equipment (especially for the group of user equipment) has a better SINR and therefore a more reliable transmission.
More specifically, it should be noted that the above-described means may be implemented on the basis of discrete hardware circuitry having an arrangement of discrete hardware components, integrated chips or chip modules, or on the basis of a signal processing device or chip controlled by a software routine or program stored in a memory and written on a computer readable medium or downloaded from a network, such as the internet.
It shall further be understood that preferred embodiments of the invention may also be any combination of the embodiments described above in relation to the respective independent claims or in the dependent claims.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
Drawings
The foregoing aspects and many of the attendant aspects of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
fig. 1a shows a base station of a multicast group comprising an antenna array and user equipments according to the present invention;
fig. 1b shows channel information reporting according to another embodiment of the present invention;
fig. 2 shows an application scenario for multicast transmission of a V2X communication service over a combined area according to another embodiment of the invention;
fig. 3 shows a flow diagram for a multicast collaboration model according to another embodiment of the invention shown in fig. 2.
Detailed Description
Fig. 1a shows a base station 100 for transmitting a multicast beam to a group 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 configured to: transmitting a plurality of reference beams 121, 122, 123, 124, 125, 126, and 127, 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 group of user devices 150, 151 and 152 and transmits a multicast beam 140 to the group of user devices 150, 151 and 152 based on the received channel information.
The user devices 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 indices 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 comprises a complex scalar value for each beam, in particular phase information, amplitude information and indices of reference beams 121, 122, 123, 124, 125, 126 and 127, in particular those beams which 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 Direct Fourier Transform (DFT), knowing the phase and amplitude of all the beam-grid (GoB) reference beams is equivalent to the 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 not directed to the user equipments 150, 151 and 152 and not directed to the spatial channels or beams of the respective user equipments 150, 151 and 152.
This advantageously reduces complexity or dimensionality, since only channel information for a subset of the reference beams 121, 122, 123, 124, 125, 126 and 127 will be fed back or transmitted from each user equipment 150, 151 or 152 to the base station 100. Thus, without using user equipment specific channel information, in particular user equipment specific precoding techniques, the base station 100 receives the channel information without making any assumptions about user equipment specific transmission or reception strategies based on the subset of reference beams 121, 122, 123, 124, 125, 126 and 127.
Based on the received channel information, the base station is able to 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 a V2X service.
According to one embodiment of the invention, the antenna weights or antenna coefficients are determined by the base station 100 based on an algorithm. The user equipments 150, 151 and 152 transmit only 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 the M reference beams and the K user equipments. The effective channel matrix H is used to model the combined effect of transmitting the reference beam and the propagation channel. Further, based on the subset of reference beams, U is set to a simplified channel matrix defined similarly to H. Entries are obtained from feedback of the user equipments 150, 151 and 152, wherein the feedback is an index with respect to the reference beams 121, 122, 123, 124, 125, 126 and 127 and a phase and amplitude of each reference beam of each user equipment. Entries with no available feedback value are set to zero because the beam contributes insignificantly to the respective user equipment 121, 122, 123, 124, 125, 126 and 127.
The columns in H are weighted individually, which can optionally be done based on the 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 the columns, a vector u is obtained.
UfullSet to MxM DFT matrix, where each column corresponds to a beam, forming a GoB beam grid. U is set to a simplified matrix containing only beams that contribute to a given user group served by the multicast beam. Antenna weight wnIs the product w ═ U.
Fig. 1b shows channel information reporting according to another embodiment of the present invention. 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 telecommunications network.
A single frequency network or SFN is a broadcast or multicast telecommunication network, wherein several transmitters or base stations 100 and 180 transmit the same signal simultaneously on the same frequency channel, in particular simultaneously transmit a multicast beam 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 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; transmitting other channel information associated with the received subset of other reference beams to the base station 100.
The base stations 100 and 180 comprise an antenna array 110 and an antenna array 190, respectively. The base stations 100 and 180 are respectively configured to: transmitting a plurality of reference beams 121, 122, 123, 124, 125, 126, and 127 and a plurality of reference beams 131, 132, and 133, wherein each 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 the transmitted reference beams 121, 122, 123, 124, 125, 126, 127, 131, 132, and 133 from a group of user devices 150, 151, and 152 and transmits a multicast beam 140 to the group of user devices 150, 151, and 152 based on the received channel information.
The user devices 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 indices 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 transmit the received channel information and data to another base station 180. Optionally, the channel information is via X of a telecommunications networkNThe interface 170.
Another base station 180 is arranged to receive data from said base station 100. In this embodiment, the further base station 180, together with said base station 100, transmits data received on the further multicast beam 160 to the group of user equipments 150, 151 and 152. Optionally, another base station 180 directs its multicast beams 160 to other user equipments in a different geographical area of the single frequency network.
Fig. 2 shows an application scenario for multicast transmission of a V2X communication service over a combined area according to another embodiment of the invention.
In the present embodiment, fig. 2 shows a 5G application scenario, also referred to as new radio, for providing high-reliability and 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 multicast information simultaneously 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 service to the group 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 invention, the 5G telecommunication network provides localized URLLC multicast data transmission according to multicast beamforming.
Channel information and data or information are exchanged between the base stations 200 and 290 and the other base station 280 via the Xn interface 270.
This has the following advantages: the base stations 200, 280 and 290 are able to transmit the same signal simultaneously on their multicast beams 240, 260 and 295, respectively, to vehicles 250, 251, 252, 253 and 254. Further, as described above, transmitting channel information and data advantageously enables selective provision of service to vehicles near the base stations 200 and 290 and those vehicles far from the base stations.
In another embodiment of the present invention, alternatively, transmitting channel information only from the 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 sending channel information, in particular the phase, amplitude and index of the interfering beam, to the other base station 280 or 290.
Therefore, 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, particularly 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 said base stations 200 and 290 is compared with the priority of the service of the other base station 280. Thus, the vehicle group or user equipment 250 and 251 has a better SINR and therefore a more reliable communication link.
In particular, in the present embodiment, the base station 200 or 290 in fig. 2 provides URLLC service by transmitting multicast beams to the group 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 the 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 invention shown in fig. 2. Fig. 3 shows a telecommunication network comprising a base station 300 and a further 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 an 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 the antenna array in the base station 300 based on the beam grid concept described above by means of a subset of the 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 the 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 XnThe interface sends the received channel information and data to the further base station 380 for further processing by the further base station 380, in particular forwarding the data to the localized mbms service entity 390.
In step 307, the further base station 380 transmits a multicast data signal to other user equipments 353, 354 and 355 within the network coverage area of the further base station 380.
While the invention 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 invention is not limited to the disclosed embodiments. Other modifications will be apparent to persons skilled in the art upon 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 invention 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 claimed invention, 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 invention has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations of the invention can be made without departing from the spirit and scope of the invention. The specification and figures are to be regarded only as illustrative of the invention as defined in the appended claims and any and all modifications, variations, combinations, or equivalents that fall within the scope of the specification are contemplated.
The subject application relates to funding of research and innovation programs by the european union horizon 2020, project under license agreement No. 760809.
Claims (16)
1. A base station (100) for transmitting multicast beams to a group of user equipments (150, 151, 152) in a telecommunication network,
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 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 transmitted reference beams from the group of user equipments (150, 151, 152); and
transmitting a multicast beam (140) to the group of user devices (150, 151, 152) based on the received channel information.
2. The base station (100) of claim 1,
the base station (100) is further configured to:
transmitting the received channel information to another base station (180).
3. The base station (100) of claim 2,
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 the received channel information and data to the other base station (180).
4. The base station (100) of claim 1,
the base station (100) is further configured to:
receiving further channel information associated with a subset of further reference beams from the group of user equipments (150, 151, 152); and
transmitting a multicast beam (140) to the group of user devices (150, 151, 152) based on the received channel information and the received other channel information.
5. The base station (100) of claim 1,
the base station (100) is further configured to:
-transmitting said received channel information to another base station (180) thereby adjusting the signal transmitted by said other base station (180).
6. The base station (100) according to any of claims 1 to 5,
the channel information includes phase information, amplitude information, and an index of a reference beam (121, 122, 123, 124, 125, 126, 127).
7. The base station (100) according to any of claims 1 to 6,
the base station (100) is further configured to transmit the multicast beam:
calculating antenna weights w of the antenna array (110)nWherein, in the step (A),
the antenna weight wnIs based on a switching algorithm associated with a subset of the transmitted reference beams;
based on the calculated antenna weights w of the antenna array (110)nForming the multicast beam (140).
8. A 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 reference beam of the plurality of reference beams is associated with an index;
receiving channel information associated with a subset of transmitted reference beams from the group of user equipments (150, 151, 152); and
transmitting a multicast beam (140) to the group of user devices (150, 151, 152) based on the received channel information.
9. A user equipment (150, 151, 152) for receiving a multicast beam from a base station (100) in a telecommunication network,
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 the subset of received reference beams to the base station (100).
10. The user equipment (150, 151, 152) of claim 9, wherein the user equipment is further configured to select the subset of received reference beams by:
determining whether a power level of the received reference beam is above a preset power level threshold.
11. The user equipment (150, 151, 152) of claim 9,
the channel information includes phase information, amplitude information, and an index of the reference beam.
12. The user equipment (150, 151, 152) according to any of claims 9 to 11,
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 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;
transmitting further channel information associated with the received subset of further reference beams to the base station (100).
13. 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 the subset of received reference beams to the base station (100).
14. A base station (180) in a telecommunications network,
the base station (180) is configured to:
the channel information is received from the base station (100) according to claim 2.
15. The base station of claim 14,
the base station (180) is further configured to:
receiving data from a base station (100) according to claim 3; and
the base station (100) according to claim 3 is arranged to transmit said received data to a group of user equipments (150, 151, 152) on another multicast beam in common with said base station.
16. The base station of claim 14,
the further base station (180) is further configured to:
the signal is adjusted according to claim 5 so as to reduce interference to multicast beams of the base station (100).
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 |
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| CN111316572A true CN111316572A (en) | 2020-06-19 |
| CN111316572B CN111316572B (en) | 2023-09-01 |
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| WO (1) | WO2019091586A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022052027A1 (en) * | 2020-09-11 | 2022-03-17 | Qualcomm Incorporated | Beam indications for a single frequency network (sfn) |
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| US11622242B2 (en) | 2021-03-03 | 2023-04-04 | Nokia Technologies Oy | Machine learning based multicast user grouping |
Citations (6)
| 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 |
| US20100238851A1 (en) * | 2009-03-11 | 2010-09-23 | Nec Laboratories America, Inc. | Optimal beam scheduling for multicasting in wireless networks |
| US20120030716A1 (en) * | 2010-07-29 | 2012-02-02 | Nec Laboratories America, Inc. | Multicast Video and Data Delivery With Beamforming Antennas in Indoor Wireless Networks |
| 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (6)
| 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 |
| US20100238851A1 (en) * | 2009-03-11 | 2010-09-23 | Nec Laboratories America, Inc. | Optimal beam scheduling for multicasting in wireless networks |
| US20120030716A1 (en) * | 2010-07-29 | 2012-02-02 | Nec Laboratories America, Inc. | Multicast Video and Data Delivery With Beamforming Antennas in Indoor Wireless Networks |
| 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 (2)
| Title |
|---|
| EHSAN ARYAFAR等，: "ADAM: An Adaptive Beamforming System for Multicasting in Wireless LANs", 《IEEE/ACM TRANSACTIONS ON NETWORKING》 * |
| SONG LI等，: "Transmit beamforming scheme for multi-antenna multicasting system with limited-rate feedback", 《2010 IEEE 12TH INTERNATIONAL CONFERENCE ON COMMUNICATION TECHNOLOGY》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022052027A1 (en) * | 2020-09-11 | 2022-03-17 | Qualcomm Incorporated | Beam indications for a single frequency network (sfn) |
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| WO2019091586A1 (en) | 2019-05-16 |
| CN111316572B (en) | 2023-09-01 |
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