JP2017163567A - Multi-point cooperative transmission mode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To configure user equipment to receive dynamically varying multi-point cooperative transmission from one or more transmission points by a wireless communication network.SOLUTION: A wireless communication network determines a set of two or more transmission points for user equipment UE1, allocates the transmission points to a multi-point cooperative transmission measurement set related to the user equipment UE1, allocates a pair of operation modes of transmission points in the multi-point cooperative transmission measurement set for communicating with the user equipment UE1, relates a code point to each of modes in the allocated pair of operation modes for the pair of transmission points, forms a codebook, and notifies the user equipment UE1 of the codebook.EFFECT: Without considerably increasing the number of bits required for a downlink control information message, dynamic switching between multi-point cooperative transmission schemes can be efficiently supported within the network.SELECTED DRAWING: Figure 1a

Description

  The present invention implements a method and method for configuring a user equipment in a wireless communication network in a network to operate to receive dynamically changing multipoint coordinated transmissions from one or more transmission points. Operative computer program product and network control node and method for interpreting downlink control signaling indicating a selected mode of operation of a transmission point in a multipoint coordinated set associated with user equipment in a wireless communication network And a computer program product and user equipment operable to perform the method.

  Multi-point coordinated (CoMP) transmission and reception can be implemented in a wireless communication network operating according to LTE radio access technology, and includes data rate, cell edge throughput, and overall system throughput. A tool that can be improved within the network. Multi-point coordinated transmission allows such improvements by functioning to coordinate scheduling with respect to time and frequency, and beamforming (spatial diversity) between transmission points. Each transmission point may comprise a radio cell or a remote radio head. In a multipoint coordinated transmission scheme, it may be necessary to dynamically turn the transmission points on and off.

  US 2010/0271968 discloses a method for a user equipment to send channel quality index (CQI) feedback information, where one or more transmission points TPCC are: It is configured to execute multi-point cooperative CoMP transmission. In US 2010/0271968, it is difficult to indicate CQI for CoMP transmissions with different transmission modes that some cell transmissions are destined for the UE and some cell transmissions are not destined for the UE, thus causing interference. Recognize that there may be cases. When such different modes are available, providing an indicator indicating the mode allows the UE to indicate the CQI and the mode for which the CQI was calculated. Thus, the UE obtains a set of possible transmission modes and corresponding indicators from the network, then calculates the CQI for the selected mode, and the transmission mode indicator for which the CQI was calculated. The CQI calculated together with the feedback is performed.

  It is desirable for networks to be able to utilize multipoint coordinated transmission techniques.

US 2010/0271968

  Accordingly, a first aspect provides a method for configuring user equipment in a wireless communication network to operate in the network to receive dynamically changing multipoint coordinated transmissions from one or more transmission points. The method determines, for the user equipment, one or more transmission points from which the user equipment can receive transmissions, and for a multipoint coordinated set associated with the user equipment. Allocating the one or more transmission points; allocating a set of operation modes of the transmission points in the multipoint coordinated set for communication with the user equipment; and the set of transmission points. Associate a code point with each mode in the assigned set of operation modes. Forming a code book; and notifying the user equipment of the code book, wherein each code point is the transmission point in the multi-point coordinated set for communication with the user equipment A display of channel state information reference signals associated with each of the operation modes.

  In the described aspects and embodiments, a quasi-static configuration of a cell reference signal pattern associated with a given channel state information reference signal (CSI-RS) resource is implemented in a multipoint coordinated set. And enables signaling to support dynamic changes of data transmission, eg, PDSCH transmission, from a particular transmission point (s) associated with a given CSI-RS resource (s).

  According to the described aspects and embodiments, each CSI-RS resource in some embodiments has a user equipment specific initialization parameter X along with the associated cell ID during multi-point coordinated set configuration. In addition, it is configured by radio resource control (RRC) signaling.

  In one embodiment, each code point includes a 2-bit code. Correspondingly, up to four configurations of multi-point cooperative operations may be set by the network control node for the user. Utilizing higher layer signaling, such as RRC signaling, that is not frequently updated, along with reasonable constraints that may be required by a base station, eg, eNB, according to aspects and embodiments Thus, the signaling overhead can be reduced. As a result, the number of bits required to support multipoint coordinated transmission on a downlink control information (DCI) message can be reduced. For example, in a coordinated set with three transmission points, the described aspects may support appropriate signaling using a new 2-bit instead of 3-bit to indicate the selected CoMP scheme.

  In one embodiment, each code point indicates a cell reference signal (CRS) pattern associated with each operation mode of the transmission point in the multipoint coordinated set for communication with the user equipment. .

  Each code point includes an indication of a channel state information reference signal associated with each mode of operation of the transmission point in the multipoint coordinated set for communication with the user equipment. In one embodiment, the code point is a cell reference signal or channel state information associated with a single transmission point that participates in the operation mode of the transmission point in the multipoint coordinated set for communication with the user equipment. Includes display of reference signal. In the described aspects and embodiments, a quasi-static configuration of a cell reference signal pattern associated with a given channel state information reference signal (CSI-RS) resource in a multipoint coordinated set is implemented and given Allows signaling to support dynamic changes of data transmission, eg, PDSCH transmission, from specific transmission point (s) associated with the CSI-RS resource (s).

  According to the described aspects and embodiments, each CSI-RS resource has a user equipment specific initialization parameter X along with an associated cell ID in a multi-point coordinated set configuration by a radio resource controller. It is configured.

  Transmission points for data transmission, eg, PDSCH transmission, are associated with a specific configured CSI-RS resource. According to some embodiments, the cell reference signal pattern transmitted from each transmission point is implicitly derived from configured CSI-RS resources. The display of the CRS pattern through physical layer dynamic signaling changes so that the multipoint coordinated transmission scheme provides optimized overall network operation so that the user equipment can Allows dematching to be performed.

  In one embodiment, the code point is a combined cell reference signal associated with two or more transmission points involved in the operation mode of the transmission points in the multipoint coordinated set for communication with the user equipment. , Or a combined display of channel state information reference signals. Accordingly, a single code point can allow the user equipment to interpret control signaling from multiple transmission points, and in this way that control signaling is “subtracted” from the received signal. So that the data transmission is decodable.

  In one embodiment, the assigned set of modes includes a subset of all available operation modes of the transmission points in the multipoint coordinated set for communication with the user equipment. It will be appreciated that a larger number of configurations would be possible than if the transmission point were encoded within a 2-bit codebook. Accordingly, the network control node is operable to select for a given user based on factors such as location, transmission point capability parameters, other similar parameters, an appropriate subset of transmission point configurations, etc. It can be.

  In one embodiment, the method includes configuring one or more transmission points in a multipoint coordinated set associated with the user equipment to use the same cell reference signal. Accordingly, the network should simplify or match the operating characteristics of the transmission point so that the codebook can encompass several transmission modes without the need for additional code points. Can be operable.

  A second aspect provides a computer program product operable to perform the method of the first aspect when executed on a computer.

  A third aspect is a network control operable to configure user equipment in a wireless communication network to operate in the network to receive dynamically changing multipoint coordinated transmissions from one or more transmission points. The network control node determines, for the user equipment, one or more transmission points from which the user equipment can receive transmissions, and is associated with the user equipment. A decision logic operable to assign the one or more transmission points to a point coordination set and an operation mode of the transmission points in the multipoint coordination set for communication with the user equipment Allocation logic operable to allocate a set of Association logic operable to associate a code point with each mode in the assigned set of communication modes and form a code book, and communication operable to notify the user equipment about the code book Each code point includes an indication of a channel state information reference signal associated with each mode of operation of the transmission point in the multipoint coordinated set for communication with the user equipment.

  In one embodiment, each code point includes a 2-bit code.

  In one embodiment, each code point indicates a cell reference signal pattern associated with each mode of operation of the transmission point in the multipoint coordinated set for communication with the user equipment.

  In one embodiment, the code point is a cell reference signal or channel condition associated with a single transmission point that participates in the mode of operation of the transmission point in the multipoint coordinated set for communication with the user equipment. Includes display of information reference signals.

  In one embodiment, the code point is a combined cell reference signal associated with two or more transmission points involved in the operation mode of the transmission points in the multipoint coordinated set for communication with the user equipment. Or a display of the combined channel state information reference signal.

  In one embodiment, the assigned set of modes includes a subset of all available operation modes of the transmission points in the multipoint coordinated set for communication with the user equipment.

  In one embodiment, the network node is operable to configure one or more transmission points in the multipoint coordinated set associated with the user equipment to use the same cell reference signal. Provide logic.

  A fourth aspect provides a method for interpreting downlink control signaling indicating a selected mode of operation of a transmission point in a multipoint coordinated set associated with user equipment in a wireless communication network, said method Receiving a codebook including a set of codepoints each associated with an operation mode of a transmission point in the multipoint coordinated set for communication with the user equipment; and Interpreting a code point received in downlink signaling with reference to interpreting a data transmission received according to a mode of operation of a transmission point in the multipoint coordination set associated with the code point Configuring the user equipment; Seen, each code point includes a display of the for communication with the user equipment, wherein the channel state information reference signal associated with each operation mode of the transmission point in the multipoint cooperation set.

  In response, the user equipment can be operable to perform a method that utilizes the codebook configuration set by the method of the first aspect. Downlink signaling, in particular downlink control signaling messages, can be interpreted with reference to code points set by the codebook.

  In one embodiment, the downlink control signaling includes a 2-bit code point.

  In one embodiment, the downlink control signaling includes a dedicated multipoint coordinated transmission point indicator message. Accordingly, new bits are provided on the downlink control channel to support dedicated CoMP control messaging.

  A fifth aspect provides a computer program product operable to execute the method of the fourth aspect when executed on a computer.

  A sixth aspect provides a user equipment operable to interpret downlink control signaling indicative of a selected mode of operation of a transmission point in a multipoint coordinated set associated with the user equipment in a wireless communication network And the user equipment receives a codebook including a set of codepoints each associated with an operation mode of a transmission point in the multipoint coordinated set for communication with the user equipment. In the multipoint coordinated set associated with the code point, receiving logic operable, interpreting logic operable to interpret a code point received in downlink signaling with reference to the code book; Received according to the operation mode of the transmission point Implementation logic operable to configure the user equipment to interpret data transmissions, each code point being the transmission point in the multipoint coordination set for communication with the user equipment A display of channel state information reference signals associated with each of the operation modes.

  In one embodiment, the downlink control signaling includes a 2-bit code point.

  In one embodiment, the downlink control signaling includes a dedicated multipoint coordinated transmission point indicator message.

  Further particular embodiments and preferred embodiments are set out in the accompanying independent and dependent claims. The features of the dependent claims may be combined with the features of the independent claims, if necessary, and may be other than those explicitly set forth in the claims.

  Where a feature of a device is described as being operable to provide a function, this is a function of the device that provides or is adapted or configured to provide that function. It will be understood that it includes features.

  Embodiments of the invention will now be further described with reference to the accompanying drawings.

FIG. 2 schematically illustrates various multipoint coordinated transmission schemes that can be implemented in a wireless communication network. FIG. 2 schematically illustrates various multipoint coordinated transmission schemes that can be implemented in a wireless communication network. FIG. 2 schematically illustrates various multipoint coordinated transmission schemes that can be implemented in a wireless communication network.

  In a wireless communication system, user equipment roams through a geographical area covered by a wireless communication network. Base stations are provided that support respective macro cells, known as eNodeBs (eNodeBs) in LTE communication networks. Several such base stations are provided, and these base stations are geographically distributed to provide wide area coverage for user equipment. When the user equipment is inside a macro cell supported by an eNodeB, communication can be established between the user equipment and that eNodeB over the associated radio link. .

  Each base station typically supports several sectors. In general, different antennas within each base station support the associated sector. Accordingly, each base station has multiple antennas and signals transmitted through different antennas are electronically weighted to provide a sectorized approach.

  Wireless communication systems are typically managed by a high level radio resource controller. The radio resource controller controls the overall operation of the wireless communication system by communicating with these eNodeBs via the backhaul communication link. The controller also communicates with the user equipment via their respective radio links with the eNodeB to efficiently manage the overall operation of the wireless communication system.

  Communication between the eNodeB inside the LTE network and the user equipment is performed on radio resources using orthogonal frequency division multiplexing (OFDM) techniques and MIMO techniques.

  Each eNodeB transmits a cell reference signal that serves as a pilot signal, and user equipment is operable to use the reference signal for various measurement purposes. In addition, the eNodeB is operable to transmit a channel state information reference signal, which allows the user equipment to perform channel estimation.

  In order to recognize the data being transmitted, the user equipment needs to know about the cell reference signal and channel state reference signal (s) being transmitted by the eNodeB, so that these The signal can be “subtracted” from the received signal, leaving only the relevant data portion intended for a given user equipment.

  It has been recognized that data throughput can be increased in wireless communication networks by using Coordinated Multipoint (CoMP) transmission techniques.

  Various multipoint coordination techniques may be implemented inside the network, and the main functions of such cooperative transmission techniques are schematically illustrated in FIGS. 1a to 1c.

  FIG. 1a schematically illustrates a multi-point coordination technique using coordinated scheduling or coordinated beamforming. User equipment UE1 is operable to receive a useful transmission S1 on the data channel PDSCH from the first eNodeB, eNB1. The reception of the transmission S1 by the UE1 is multiplied by the precoding index P1 and is regarded as a combination of the propagation characteristics H1 multiplied by the transmission S1. Similarly, the second eNodeB eNB2 is operable to transmit transmissions to user equipment operating in the area of radio coverage supported by eNB2, and thus precoding index P2 Is used to perform transmission SI. UE1 regards the radio signal as interference.

  Cooperative scheduling techniques are techniques in which the operations of eNode B, eNB 1 and eNB 2 are coordinated to optimize the overall operation within the network. In this case, the precoding indices P1 and P2 used by the respective base stations are selected to attempt to set up signaling that would normally be seen as interference for signals that are approximately zero. That is, in the illustrated example, H2 × P2 × SI is selected to approximate zero as seen by UE1.

  FIG. 1b schematically illustrates a multi-point coordination technique using dynamic point selection. The user equipment UE1 is operable to receive a useful transmission S1 on the data channel PDSCH from the first eNodeB, eNB1. The reception of the transmission S1 by the UE1 is multiplied by the precoding index P1 and is regarded as a combination of the propagation characteristics H1 multiplied by the transmission S1. Similarly, the second eNodeB eNB2 is operable to transmit a transmission S1 to the user equipment UE1 on an appropriate data channel using the precoding index P2. Data to be transmitted is synchronized between the base stations eNB1 and eNB2. The user equipment receives data from only one of the transmission points at a time, and the transmission point is selected based on which signal is better received at the user equipment at a given point. . That is, which of H1 × P1 and H2 × P2 is larger.

  FIG. 1c schematically illustrates a multipoint coordination technique using joint transmission. The user equipment UE1 is operable to receive a useful transmission S on the data channel PDSCH from the first eNodeB, eNB1. The reception of the transmission S1 by the UE1 is regarded as a combination of the propagation characteristics H1 multiplied by the precoding index P1 and multiplied by the transmission S. Similarly, the second eNodeB eNB2 is operable to send a transmission S to the user equipment UE1 on the appropriate data channel using the precoding index P2. Data to be transmitted is synchronized between the base stations eNB1 and eNB2. Assuming that receiving transmissions from both transmission points is determined to be greater than receiving from one or the other of the transmission points, the user equipment may transmit both transmissions in a given time slot. Data can be received from points. That is, the condition of (H1 × P1 + H2 × P2) is larger than either of H1 × P1 or H2 × P2 occurs alone.

Overview Before considering any embodiment in more detail, an overview will first be given.

  Dynamic switching between multipoint coordinated (CoMP) downlink transmission schemes, such as coordinated scheduling or coordinated beamforming (CS / CB) and dynamic point selection (DPS), is a MIMO (multiple input, multiple It needs to be supported to maximize the benefits associated with fast changes in the output) channel behavior.

  Such dynamic switching generally requires multiple transmission points within the network that may have different cell IDs and / or different numbers of antenna ports. As a result, each transmission point involved in a multipoint coordinated transmission regime may be associated with a different cell reference signal (CRS) pattern. The user equipment needs to know the cell reference signal at the point where it receives the data and correctly performs the data decoding on the received signal.

  The cell reference signal pattern is associated with a cell ID that is autonomously detected by the user equipment. The channel state information reference signal (CSI-RS) resource associated with each transmission point within the cooperative set is configured by higher layer radio resource control (RRC) signaling inside the network. The configured CSI-RS resource in the multipoint coordination set does not directly indicate to the user equipment the CRS pattern associated with each subframe of data transmission, eg, PDSCH transmission. As a result, if data is transmitted, for example, PDSCH from one or more arbitrary transmission points in the multi-point cooperation set, the user equipment does not necessarily provide information on the resource element location of the cell reference signal. Since it is not always necessary, the user equipment cannot correctly rate-match for data transmission, eg, PDSCH.

  Therefore, to implement an efficient multipoint coordinated transmission technique inside the network, to enable the user equipment to correctly rate-match around the cell reference signal, It will be appreciated that it is important to be able to indicate the resource element location of the cell reference signal.

  The described aspects and embodiments implement a quasi-static configuration of a cell reference signal pattern associated with a given channel state information reference signal (CSI-RS) resource in a multipoint coordinated set, and Enable signaling to support dynamic changes of data transmission, eg, PDSCH transmission, from specific transmission point (s) associated with CSI-RS resource (s).

  According to the described aspects and embodiments, each CSI-RS resource is provided by a radio resource controller so as to have a user equipment specific initialization parameter X together with an associated cell ID in a multipoint coordinated set configuration. It is configured.

  Transmission points for data transmission, eg, PDSCH transmission, are associated with a specific configured CSI-RS resource. According to some embodiments, the cell reference signal pattern transmitted from each transmission point can be implicitly derived from configured CSI-RS resources. Display of the CRS pattern through physical layer dynamic signaling allows user equipment to rate dematch the data channel as a multipoint coordinated transmission scheme change to provide optimized overall network operation. Will be able to do.

  Aspects and embodiments provide higher layer signaling, eg, RRC signals, where signaling overhead is not frequently updated, along with reasonable constraints that may be required by a base station, eg, eNB. By utilizing it, it may be possible to be reduced. As a result, fewer bits may be needed to support multipoint coordinated transmission on the downlink control information message. For example, in a cooperating set with three transmission points, the described aspects allow appropriate signaling to be supported using a new 2-bit instead of a 3-bit indicating the selected CoMP scheme. can do.

Example 1:
In some embodiments, the network may be operable to indicate that only a single cell reference pattern needs to be shown to the user equipment for a given multipoint coordination set. It may also be intended that the user equipment uses, for example, a multi-point coordinated transmission scheme, i.e. coordinated scheduling / cooperative beamforming and dynamic point selection. According to one such example, dynamic switching between multi-point coordinated transmission schemes is equivalent to the selection of a single transmission point (from a cell reference signal perspective).

  An example of code points that may be associated with 2-bits in downlink control information messaging configured by RRC signals is shown by Table 1.

  It will be appreciated that the interpretation of code points is quasi-statically defined and updated by RRC signals. The UE is provided with one of the code point selections by means of a 2-bit field that forms part of the downlink control information message.

  Assuming that the cell reference signal pattern of the transmission point, or at least the frequency shift of the cell reference signal pattern, can be matched within the cooperation set by the network, the joint transmission multipoint coordinated transmission scheme is still as described above. It will be understood that it can be supported. In such a case, the cell reference signal pattern of the transmission point with the maximum number of antenna ports will be shown and one of the first three code points in the codebook will be shown. Will be allocated.

Example 2:
According to some embodiments, multiple cell reference signal patterns may be presented to the user equipment, as may be done, for example, in joint transmission multipoint coordinated transmission. In such a case, dynamic switching between multi-point coordinated transmission schemes needs to be recognized that different combinations of cell reference signal patterns can result from different combinations of joint transmission points.

  An example of code point allocation in a 2-bit message constructed by RRC signals is given in Table 2.

  As in Example 1, the interpretation of code points is defined and updated semi-statically by RRC signaling. The user equipment is informed of the code point selection in a 2-bit message related to multi-point coordination and operation, and is transmitted to the user equipment in a downlink control information message.

  In the above example, the last code point is configured for 3-point CoMP JT. When it is signaled to the user equipment in the downlink control information message, the user equipment is operable to perform rate mismatch around all three cell reference signal pattern combinations.

Example 3:
According to some embodiments, multiple cell reference signals are shown to user equipment, as may be required, for example, in a network implementing a joint transmission multipoint coordinated transmission scheme. In such cases, dynamic switching between multipoint coordination schemes needs to reflect various combinations of cell reference signal patterns.

  Possible codebooks related to code points of 2-bit CoMP messages configured by RRC signals are given in Table 3.

  As in Example 2, the last code point is configured for either a 2-point CoMP JT or a 3-point CoMP JT, and the number of transmission points and which transmission point is assigned to that code point Will be selected depending on the configuration of the network in the area of the user equipment and the multipoint coordination set selected by the network for that user equipment. Thus, although the last code is shown for the user equipment, the user equipment operates to rate dematch around all cell reference signal pattern combinations given by the configuration of the multipoint coordination set. be able to.

Example 4:
According to some embodiments, multiple cell reference signal patterns are shown to the user equipment to support a joint transmission multipoint coordinated transmission scheme, for example. In such cases, dynamic switching between multipoint coordinated implementation schemes must allow for different combinations of cell reference signal patterns associated with different transmission points.

  Possible code point configurations associated with 2-bits configured by RRC signals for user equipment are given in Table 4.

  Compared to Example 2 above, more code points in the codebook are dedicated to joint transmission multipoint coordinated transmission.

  In aspects and embodiments, dynamic switching between several pre-selected or pre-configured multi-point coordinated transmission schemes is possible without increasing the number of bits required in the downlink control information message. Recognizes that it can be efficiently supported inside the network. The configuration of code points interpreted by the user equipment may be set on the user equipment by the user equipment base, and is pre-configured semi-statically by the RRC signal.

  Aspects provide a problem-solving technique that assists in signaling for transmission point selection for user equipment, thus enabling decoding of data transmissions. The signaling suggested by the aspects and embodiments requires reasonable control overhead, but provides flexibility and enhanced spectral efficiency throughout the network.

  Allocation of more than 2 bits in a new dedicated CoMP message to be carried as part of downlink control information messaging allows increased pre-configured CoMP options to be presented to the user equipment It will be understood that

  Those skilled in the art will readily recognize that the various method steps described above can be performed by a programmed computer. As used herein, some embodiments are also intended to include program storage devices, eg, digital data storage media, which are machine-readable Or computer readable and encoded machine-executable or computer-executable program of instructions, wherein the instructions are part or all of the method steps described above Is running. The program storage device can be, for example, a digital memory, a magnetic storage medium such as a magnetic disk or magnetic tape, a hard drive, or an optically readable digital data storage medium. Embodiments are also intended to include computers that are programmed to perform the steps of the method described above.

  The functions of the various elements shown in the drawings, including any functional blocks labeled as “processors” or “logic”, execute software in conjunction with dedicated hardware, as well as appropriate software. May be provided through the use of hardware that can. When provided by a processor, the functionality may be provided by a single dedicated processor, by a single shared processor, or by multiple individual processors, some of which may be shared. Furthermore, the explicit use of the terms “processor” or “controller” or “logic” should not be interpreted to mean exclusively hardware capable of executing software, and Without limitation, digital signal processor (DSP) hardware, network processors, application specific integrated circuits (ASICs), and field programmable gate arrays (FPGAs). a field programmable gate array (ROM), a read only memory (ROM) for storing software, and a run -Time access memory: the (RAM random access memory), can be implicitly includes a non-volatile storage. Other hardware may be included, conventional and / or custom. Similarly, any switches shown in the drawings are conceptual only. These functions may be performed through the operation of program logic, through dedicated logic, through program control and interaction with dedicated logic, or even manually. It can be selected by the implementer to be understood in more detail.

  It should be understood by those skilled in the art that any block diagram herein represents a conceptual diagram of an illustrative circuit embodying the principles of the present invention. Similarly, any flow chart, flowchart, state transition diagram, pseudocode, etc. may be substantially represented in the form of a computer-readable medium, whether or not such a computer or processor is explicitly indicated. It will be understood that it represents various processes that may be performed and thus performed by a computer or processor.

  The description and drawings merely illustrate the principles of the invention. Accordingly, those of ordinary skill in the art may devise various configurations that are embodied or embodied within the scope of the present invention, although not explicitly described or shown herein. It will be understood that it will be possible. Moreover, all examples listed herein primarily assist the reader in understanding the principles and concepts of the invention contributed by the inventor (s) to promote the art. It is expressly intended to be for educational purposes only and should be construed not to be limited to only such specifically listed examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalent forms thereof.

Claims (1)

A method for configuring user equipment in a wireless communication network in the network to operate to receive dynamically changing multipoint coordinated transmissions from one or more transmission points, comprising:
For the user equipment, the user equipment determines one or more transmission points from which transmissions can be received, and the one or more transmissions for a multipoint coordinated set associated with the user equipment. A step of assigning points;
Assigning a set of operation modes of the transmission point in the multi-point coordinated set for communication with the user equipment;
Associating a code point with each mode in the assigned set of operation modes of the set of transmission points to form a code book;
Notifying the user equipment of the code book,
Each code point includes an indication of a channel state information reference signal associated with each mode of operation of the transmission point in the multipoint coordinated set for communication with the user equipment.

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