TW201304448A - Method for transmitting data in a communication system, first network node and second network node thereof - Google Patents

Abstract

The invention relates to a method (MET1) for transmitting data in a communication system. The communication system comprises a first network node (BS1). The method comprises the steps of transmitting (M1/14) from the first network node (BS1) to a second network node (MS) during a first time interval first data unit and first reference signals (RS1) related to the first data unit (DU1), transmitting (M1/17) from the first network node (BS1) to the second network node (MS) during at least one second time interval at least one second data unit (DU2) and at least second reference signals (RS2) related to the at least one second data unit (DU2), determining (M1/20) at the second network node (MS) for a transmission channel between the first network node (BS1) and the second network node (MS) a channel estimation based on the first reference signals (RS1) and based on the at least one second reference signals (RS2), and recovering (M1/21) at the second network node (MS) the first data unit (DU1) and the at least one second data unit (DU2) based on the channel estimation. The invention further relates to a first network node (BS1) and to a second network node (MS).

Description

Method for transmitting data in communication system and first network node and second network node thereof

This invention relates to data communications, and more particularly to the invention, with respect to, but not limited to, channel estimation in a radio communication system.

If a signal is transmitted from a transmitter, several effects such as scatter, debilitation, and/or power attenuation can have an effect on the transmitted signal at one of the locations of the receiver. Channel status information (CSI = Channel Status Information) describes how the signal propagates from the transmitter to the receiver. The CSI must be known at the receiver to recover the data without error from the received signal, and the CSI must be known at the transmitter to adapt and optimize the further signal transmission from one of the transmitters to the receiver for the current channel conditions. CSI is extremely important for achieving reliable communication between a transmitter and a receiver or between one of several transmitters and receivers, especially for multi-antenna systems such as CoMP systems (CoMP = multi-point collaboration) High data rate for applications. The short-term knowledge of a current channel condition is a so-called instantaneous CSI. One of the instantaneous CSI acquisitions is limited by the speed at which the channel conditions change. In a fast debilitating system, if the channel condition changes rapidly between successive transmissions of two single information symbols, only a so-called statistical CSI can be applied. The statistical CSI can provide information on a weakly distributed type, information on an average channel gain, information on a line of sight component, and/or a spatially related information. The actual communication system usually uses a mixture of instantaneous CSI and statistical CSI.

The instantaneous determination is usually made at the receiver by applying a measurement to a so-called training sequence or pilot sequence transmitted by the transmitter or by the transmitter system. CSI, where it is known how the receiver self-transmits or the transmitter system and by using a combination of training sequences or pilot sequences transmitted at the transmitter or at the transmitter system and training sequences or derivatives received at the receiver The combined knowledge of the frequency sequences transmits a training sequence or a pilot sequence.

The manner in which data is transmitted from a transmitter or a transmitter system to a receiver and the manner in which channel estimation is performed at the receiver affects one of the communication systems' spectral efficiency and an overall data rate.

Accordingly, it is an object of the present invention to improve the spectral efficiency and overall data rate of a communication system. This object is achieved by a method of transmitting data in a communication system. The communication system includes a first network node. The method includes the steps of: transmitting a first data unit and a first reference signal for the first data unit from the first network node to a second network node during a first time interval; in time Transmitting at least one second data unit and at least a second reference signal for the at least one second data unit from the first network node to the second network during at least one second time interval after the first time interval a channel node; determining, at the second network node, a channel based on the first reference signal and a transmission channel between the first network node and the second network node based on the at least one second reference signal Estimating; recovering the first data unit and the at least one second data unit based on the channel estimate at the second network node. Preferably, the determining step is based on the first time interval and one of the at least one second time interval filtering or a time averaging.

The object is further achieved by a first network node such as a base station and This is achieved by a second network node, such as one of the mobile stations.

The method according to the invention provides the advantage of improving the spectral efficiency of one of the transmission channels between the first network node and the second network node, in particular when the second network node is in a poor SINR condition (SINR = signal to interference plus signal ratio), such as in the case of a mobile station located in the edge between two radio cells. This improvement can be achieved because the channel estimate is not greatly affected by short-term effects such as fast debilitating effects, and thus one of the channel estimates can be increased in accuracy. By applying the method to further transmit channels between the further first network node and the further second network node, the overall data rate of one of the communication systems can be increased without further radio resources. In addition, due to more accurate channel estimation, a link adaptation can potentially select a higher modulation and coding scheme, further increasing the data rate of the system. If adjacent frequency resources in a predefined range are applied to the transmission of the first data unit and the at least one further transmission of the at least one second data unit and if there is a spectral coherence between the frequency resources (spectral coherence) ), the present invention has provided an improvement in one channel estimate. This further allows recovery of at least two data units with a single channel estimate, rather than restoring each data unit with a separate channel estimate.

Moreover, if the first data unit and the at least one second data unit have been recovered without error, the second network node may transmit a combined single acknowledgement, or if the first data unit and the at least one second The data unit is recovered without error, and the second network node can transmit a combined single negative response. This allows for the reduction of signaling traffic from the second network node to the first network node.

According to a preferred embodiment, the method further includes the step of transmitting the first information from the first network node to the second network node, and the first information directs the second network node to perform the determining step and This recovery step. Transmitting the first information directs the second network node to use the next transmission of the data unit at the second network node to determine an overall channel estimate for the data unit, and to the second network node The first network node is informed that it is not expected to receive a positive or negative acknowledgement for each of the data units. If the first information is not transmitted from the first network node to the second network node, the first network node is expected to perform co-processing at one of the second network nodes by performing channel estimation immediately Data recovery after receiving a single data unit.

According to a further preferred embodiment, the same frequency resource (such as 12 adjacent subcarriers and a time length) is used in the same application as 3GPP LTE (3GPP=3rd Generation Mobile Communication Partnership Project; LTE=Long Term Evolution) The first data unit and the at least one second data unit are transmitted on one of 0.5 milliseconds PRB (PRB=physical resource block). In this case, the spectral homology problem between adjacent frequency resources is small and therefore negligible. In this way, channel estimation is even more reliable. Moreover, the receiver at the second network node does not need to be tuned between the reception of the first data unit and the at least one second data unit, thereby allowing one of the first data unit and the at least one second data unit The transmission sequence is shorter. In a still further preferred embodiment, the first information includes an indication of one of the same frequency resources at the first time interval and the at least one second time interval. Thereby, the signaling resource for indicating the frequency resource can be reduced.

In a still further preferred embodiment, the communication system further includes a third network node, and the method further comprising the step of receiving the second information from the third network node at the first network node, The second information indicates that the radio resource is used at the third network node at the first time interval and the at least one second time interval; and transmitting the second information from the first network node to the second network Road node. This still further preferred embodiment provides the advantage of informing the second network node about resource allocations at neighboring network nodes of the first network node. The second network node can use the second information to improve the accuracy of estimating one of the interference properties (interference power, spatial co-variation, etc.) and thereby improve channel estimation.

In a further embodiment, if spatial beamforming is applied in the communication system, the third network node may include an antenna array, and the second information further indicates to the same frequency resource and at the first time interval and The at least one second time interval uses the same precoding weights applied to the antenna array. The further embodiment allows for information to be provided to the second network node, the information being that the directional interference from the third network node will not change during the first time interval and the at least one second time interval.

According to a further preferred embodiment, the first data unit and the at least one second data unit are transmitted in a single transport block comprising a single MAC header. The further preferred embodiment provides the advantage of saving MAC signaling add-on (MAC = Medium Access Control) and also preferably provides the advantage of saving RLC signaling additions (RLC = Radio Link Control).

Preferably, the method further comprises the step of receiving third information at the first network node, and the third information instructing the second network node to perform the One of the steps to determine the ability. Thereby, the first network node obtains knowledge that the second network node connected to the first network node is capable of performing the steps of the method of the invention on the receiver side of the transmission channel. The features of the present invention may be provided by a new terminal category, and the third information may include the new terminal category. The third information can be provided to a base station by, for example, the second network node (one of the mobile stations in the uplink direction).

According to several alternative embodiments, the method further comprises verifying whether the step of the assigning step should be performed, and the verifying is based on at least one of the following: the third information has been received at the first network node; The second network node is configured to restore a time delay of one of the first data unit and the at least one second data unit to be equal to or lower than a first predefined threshold; And a data rate of one of the data unit and the at least one second data unit is equal to or higher than a second predefined threshold; transmitting the first data unit from the at least two antenna systems in a multi-point transmission mode and The at least one second data unit is configured to receive, at the second network node, a signal to interference ratio of the first data unit and the at least one second data unit that is equal to or lower than a third predefined threshold. The first network node may apply one or more criteria given above to determine whether the method of the present invention should be applied for transmission of data from the first network node to the second network node. This allows for flexible flexibility between the method of the present invention and a method of co-transmission that does not use a single allocation of one of several consecutive transmission resources for a number of data units and does not use one of the channel estimates covering the reference signals for a number of data units. Switch.

Further aspects of the invention are defined and described in the following embodiments of the invention Favorable features.

Embodiments of the present invention will be described in the following embodiments, which are illustrated by way of non-limiting illustration.

1 shows a radio communication system RCS1 including one of the radio access networks RAN1 in accordance with an exemplary embodiment of the present invention. For the sake of simplicity, the core network of the radio communication system RCS1 and the connection of the radio communication system RCS1 to further radio communication systems, to the internet or to the fixed line communication system are not shown.

The radio communication system RCS1 can be, for example, a 3GPP LTE radio communication network using OFDM (OFDM = Orthogonal Frequency Division Multiplexing). In a further alternative, the radio communication system RCS1 can be, for example, a 3GPP UMTS radio communication network (UMTS=Global Mobile Telecommunications System), based on the IEEE 802.16 family of standards (IEEE = Institute of Electrical and Electronics Engineers) WiMAX radio communication network ( WiMAX = Global Interoperability for Microwave Access) or one of the IEEE 802.11 family of standards (WLAN = Wireless Area Network).

The radio access network RAN1 illustratively includes a first base station BS1, a second base station BS2, and a transmission path L between the first base station BS1 and the second base station BS2. The transmission path L can be, for example, one of the applications in the 3GPP LTE X2 interface.

The term "base station" can be taken as a synonym for a base transceiver station, a Node B, an enhanced Node B, an access point, etc. and/or as a base transceiver station, a Node B, an enhanced Node B, Access point, etc., and can describe A device that provides wireless connectivity to one or more mobile stations by one or more radio links.

For the sake of simplicity, no further base stations, further connections between the base stations, and connections between the base stations and the network nodes of the core network are shown.

The first base station BS1 includes, for example, a main control unit BS-MU having one of the first remote radio heads RRH1 (RRH=remote radio head) of an active component such as a power amplifier. a first transmission path BS1-L1 between a base station BS1 and the first RRH RRH1 and a first base station RAN1-BS located adjacent to the non-active component and directly connected to the first base station RAN1-BS A first antenna system BS1-AS. Alternatively, the first base station BS1 comprises one or more RRHs and/or more than one antenna system directly connected to the first base station RAN1-BS.

The first antenna system BS1-AS may comprise, for example, two antenna elements. Alternatively, the first antenna system BS1-AS may comprise more than two antenna elements, such as four antenna elements.

The first transmission path BS1-L1 may be based, for example, on the CPRI standard (CPRI = General Public Radio Interface).

The first RRH RRH1 includes a first slave unit RRH-SU and a second antenna system RRH1-AS connected to the first slave unit RRH-SU. The second antenna system RRH1-AS may comprise, for example, two antenna elements, and may be a passive antenna array or an active antenna array. In an active antenna array, a complete RF transceiver can be integrated into each antenna element and the antenna elements are stacked to form the active antenna array.

In a passive antenna array, the RF transceivers are separated from the antenna elements.

Alternatively, the second antenna system RRH1-AS may comprise more than two antenna elements, such as four antenna elements.

The first antenna system BS1-AS provides wireless coverage for a first radio cell BS-Cell-1, and the second antenna system RRH1-AS provides wireless coverage for a second radio cell RRH-Cell-2 .

The term "radio cell" can be taken to mean a synonym for a cell, a radio sector, a sector, etc. and/or as a cell, a radio sector, a sector, and the like.

The second base station BS2 includes a second slave unit BS-SU and a third antenna system BS2-AS connected to one of the second slave units BS-SU. The third antenna system BS2-AS may comprise two antenna elements and provide a wireless coverage area for a third radio cell BS-Cell-3. In a further alternative, the second base station BS2 may comprise more than one antenna system, and the third antenna system BS2-AS may comprise more than two antenna elements, such as four antenna elements.

The first radio cell BS-Cell-1 and the second radio cell RRH-Cell-2 may be configured to be part of a cooperative cluster CC, and thereby the first unit is controlled by the master unit BS-MU Slave unit RRH-SU.

In a further alternative, two or more radio cells may be configured to be part of the cooperating cluster CC.

The term "collaboration cluster" can be thought of as a synonym for collaborative collections, collaborative collections, CoMP clusters, clusters, etc. and/or called collaborative collections, associations. As sets, CoMP clusters, clusters, etc., and may describe two or more antenna elements of a radio communication system that can cooperatively uplink RF signals to one of one or more mobile stations.

Preferably, the antenna arrays to which the radio cells belong to the cooperative cluster CC are selected based on a distributed self-configuration algorithm executed at the base stations BS1, BS2 of the radio communication system RCS1. The self-configuring algorithms may be based, for example, on antenna systems BS1-AS, RRH1- located in the radio cells BS-Cell-1, RRH-Cell-2, and RRH-Cell-3 and the radio communication system RCS1. Long-term measurement of path loss between mobile stations at specific locations within the coverage area of AS and BS2-AS.

In an alternative, the cooperative cluster CC can be configured by an O&M network node (O&M = Operation and Maintenance) of the radio communication system RCS1 (not shown for simplicity). A mobile station MS can be located within an overall coverage area of one of the collaborative clusters CC.

The term "mobile station" can be taken as a synonym for an action unit, an action user, an access terminal, a user device, a user, a user, a remote station, etc., and may occasionally be referred to as an action unit, Mobile users, access terminals, user devices, users, users, remote stations, and more. The mobile station MS can be, for example, a cellular phone, a portable computer, a pocket computer, a handheld computer, a number of assistants, or a vehicle-mounted mobile device.

In a downlink direction from the cooperative cluster CC to the mobile station MS, all of the radio cells or a subset of the radio cells BS-Cell-1 and RRH-Cell-2 of the cooperative cluster CC may be accessed via Line link MIMO Transmission (MIMO = Multiple Input Multiple Output) or Downlink MISO Transmission (MISO = Multiple Input Single Output) transmitted in a multipoint transmission mode including signalling information to the mobile station MS or for a user service ( A downlink radio frequency signal is transmitted under a data element such as one of the video downloads running on the mobile station MS.

According to the invention, the main control unit BS-MU of the first base station RAN1-BS allocates a first time interval to the transmission of one of the first data units of the mobile station MS and transmits it to the mobile station MS. One or several further time intervals are assigned to one or several further data units. Then, the first base station RAN1-BS transmits the first data unit to, for example, all antenna systems BS1-AS, RRH1-AS of the cooperative cluster CC, and all of the antenna systems BS1-AS, RRH1-AS will The first data unit is transmitted to the mobile station MS along with the first reference signal in the first time interval. After that, the first base station RAN1-BS can transmit the one or more further data units to all antenna systems BS1-AS, RRH1-AS of the cooperative cluster CC, and all of the antenna systems BS1-AS, RRH1- The AS transmits the one or more further data units together with further reference signals to the mobile station MS. Alternatively, the first base station RAN1-BS may simultaneously transmit the first data unit and the one or more further data units to all antenna systems BS1-AS, RRH1-AS of the cooperative cluster CC.

The mobile station MS receiving the first data unit together with the first reference signals and receiving the one or more further data units together with the further reference signals is based on the first reference signals and the further reference signals to the cooperative cluster CC One channel estimation between the transmission channel and the mobile station MS Measurement.

The allocation and the time interval between the first data unit and the one or more further data units may also be applied between a single radio cell controlled by one of the base stations of the radio communication system RCS1 and the mobile station MS. This determination of the inventive channel estimate, and whereby one of the applications of the present invention is not limited to a CoMP communication system.

Further details of the invention are given with respect to Figure 2.

Referring to Figure 2, a flow diagram of a method MET1 in accordance with one of several alternative embodiments is shown. The number of steps used to perform the method MET1 is not critical, and the number of steps and the order of the steps may be varied without departing from the scope of the invention as would be appreciated by those skilled in the art. Some of these steps can also be performed simultaneously, for example, steps M1/3 and M1/5 or steps M1/8 and M1/10. The method MET1 is shown with respect to the network node shown in FIG.

In a first optional step M1/1, the mobile station MS can transmit the capability information CAP-INFO to the first base station BS1, and in a second optional step M1/2, the first base station BS1 receives the Capability information CAP-INFO. The capability information CAP-INFO indicates, by, for example, using a one-bit flag, the capability of the mobile station MS to perform a channel estimation in one of two or more time intervals, at which time Two or more data units can be transmitted from the radio communication system RCS1 to the mobile station MS in the interval. The time interval may be, for example, one TTI (TTI = Transmission Time Interval) corresponding to 1 millisecond of a so-called subframe of one of the applications in 3GPP LTE. This means that the mobile station MS must be able to store data units and reference signals, such as beacons or pilots of consecutive TTIs. When the mobile station MS performs the wireless When the electrical communication system RCS1 is registered and authenticated, the capability information CAP-INFO can be transmitted from the mobile station MS at a time point. In an alternative, the capability information CAP-INFO may be transmitted from the mobile station MS at a point in time when the mobile station MS performs a location update for one of the new location area or the new routing area. In a further alternative, when the mobile station MS performs handover to one of the radio cells under the control of the first base station BS1, the capability information CAP-INFO may be transmitted from the mobile station MS at a time point. . In a still further alternative, at the first base station BS1 during an registration and authentication procedure for the mobile station MS, an HLR (HLR = Home Location Register) or VLR (VLR = Visitor Location) The registrar) retrieves the capability information CAP-INFO. If all mobile stations support this capability, there is no need to transmit the capability information CAP-INFO.

In the next optional step M1/3, the first base station BS1 can receive the data D from one of the core network nodes of the radio communication system RCS1. The profile D can be, for example, user profile, such as an IPv4 data packet or an IPv6 data packet for one of the services running on the mobile station MS. In an alternative, the profile D may be signaling information to be forwarded from, for example, the core network node to the mobile station MS. In a further alternative, instead of performing this step M1/3, the first base station BS1 may have generated a signaling information D for controlling the mobile station MS and having to transmit to the mobile station MS.

In a further selection step M1/4, the second base station BS2, which is a neighboring base station of the first base station BS1, can transmit the first interference information INTERF-INFO1 to the first base station BS1, and is selected in the next In step M1/5, the first base station BS1 receives the first interference information INTERF- INFO1. The first interference information INTERF-INFO1 indicates that the radio resource is used by the second base station BS2 for the third radio cell BS-Cell-3 at one or several next time intervals. If the first interference information INTERF-INFO1 includes only information for a single time interval, the transmission of the first interference information INTERF-INFO1 may be repeated by the second base station BS2 every time interval, or if the first The interference information INTERF-INFO1 includes a plurality of time intervals (greater than one time interval) (on which the same PRB is allocated by the second base station BS2), the first interference information INTERF- may be repeated after several time intervals. Transmission of INFO1. The first interference information INTERF-INFO1 may include, for example, a bitwise indication of one or several time-frequency-resources (such as PRBs applied in 3GPP LTE) by setting such specific time-frequency-resources A bit of "1" indicates one of the time-frequency-resource allocations for the next time interval or for a number of next time intervals. One bit position in the bit family implicitly indicates a particular time-frequency-resource.

In an alternative, the first interference information INTERF-INFO1 may include, for example, a bitwise indication of one or several time-frequency-resources by setting the bits of the particular time-frequency-resource to "1" indicates that one of the time-frequency-resources for the next time interval or for a number of next time intervals is unallocated.

Preferably, the first interference information INTERF-INFO1 may further indicate one or two consecutive consecutive time intervals and one of the same frequency resources as the application in 3GPP LTE (such as a group of 12 adjacent OFDM pairs) Carrier) using the antenna system BS2-AS applied to the second base station BS2 The same precoding weights for the line elements.

The term "transmission weight" can be taken as a synonym for an antenna weight, beamforming weight, precoder, precoding weight, transmission precoder, etc., and may occasionally be referred to as an antenna weight, beamforming weight, pre- Encoder, precoding weights, transmission precoders, etc.

In a further step M1/6, the main control unit BS-MU of the first base station BS1 can separate the data D into the first data unit and one of the transmission resource units corresponding to one of the radio communication systems RCS1. One of the second data units. The transmission resource unit can be, for example, a PRB such as that used in 3GPP LTE. Alternatively, the material D can be divided into more than two data units.

In the next optional step M1/7, the master unit BS-MU of the first base station BS1 can verify whether the transmission should be transmitted by a common HARQ procedure or by a joint scheduling and channel estimation procedure according to the present invention. Data unit of data D.

In the case of the common HARQ procedure, the cooperative cluster CC may perform the following: a first schedule for one of the first transmissions of a first data unit; the first data unit to the mobile station MS a first transmission; at least one second schedule for at least one second transmission of the at least one second data unit; and the at least one second transmission of the at least one second data unit to the mobile station MS. On the receiver side, the mobile station MS can perform the following: estimating the first channel of the first data unit; and pre-defining the one of the first data units to the collaboration cluster One of the first positive or negative acknowledgements of the CC transmission; the at least one second data unit At least one second channel estimate; transmitting at least one second transmission of the at least one second data unit in the form of a synchronous HARQ procedure to at least one second positive or negative acknowledgement of the cooperative cluster CC.

In the case of a joint scheduling and channel estimation procedure, the joint scheduling on a transmitter side means that the cooperative cluster CC performs the following: for one of the first data units, the first transmission and And a first schedule of the at least one second transmission of the at least one second data unit; and the first transmission of the first data unit to the mobile station MS and the at least one second data unit of the mobile station MS At least one second transmission. The joint channel estimation on the receiver side means that the mobile station MS can perform the following: estimating a single channel of the first data unit and the at least one second data unit; transmitting the first data unit One of the latter predefined time to one of the first affirmative response or one of the first negative acknowledgement transmissions of the cooperative cluster CC; and the predefined time after transmitting the at least one second data unit in the form of an asynchronous HARQ procedure to At least one second acknowledgement of at least one second positive response or at least one second negative acknowledgement of the cooperative cluster CC.

The verification may be based on one or several of the following requirements: according to a first requirement, if the capability information CAP-INFO has been received in step M1/2, the joint schedule and the channel estimation program may be applied for transmitting the The data D indicates that the mobile station MS is capable of performing one of the joint channel estimation capabilities.

According to a second requirement, the time delay for recovering one of the first data unit and the at least one first one of the at least one second data unit at the mobile station MS may be equal to or lower than a first predefined threshold value. Attributable to the joint frequency It is estimated that a positive or negative response to a data unit that has been transmitted during the joint scheduling and channel estimation procedure may then arrive, followed by a positive or negative response to the data unit transmitted during a common HARQ procedure. Arrivals. This means that, for example, even if the mobile station MS can be used for the joint channel estimation, the data D included in the first data unit and the at least one second data unit may belong to a highly delayed sensitive service ( Such as an online game), in which case one of the delays (eg, 3 milliseconds) for recovering the first data unit or for transmitting a request for a retransmission of one of the negative responses is not tolerable.

According to a third requirement, the data rate for one of the service data D is equal to or higher than a second predefined threshold. This means that if the data D belongs to a service with a high data volume (such as a video download rate of at least 1 Mbit/s or at least 10 Mbit/s, for example), it can be applied only. The joint schedule and channel estimation.

According to a fourth requirement, the first data and the at least one second data are transmitted from the first antenna system BS1-AS and the second antenna system RRH1-AS in a multi-point transmission mode. This means that if a CoMP transmission mode is applied to the mobile station MS, only the joint scheduling and channel estimation can be applied.

According to a fifth requirement, the signal interference ratio of one of the receiving data units at the mobile station MS is equal to or lower than a third predefined threshold. This means that the joint scheduling and channel estimation can also be used without the CoMP transmission mode (eg, for a mobile station having one of the low SINR conditions, such as at the cell edge between one of the two radio cells) One of the action stations). For example, if the mobile station MS measures and transmits to one of the first base stations BS1 The joint scheduling and channel estimation procedure can only be applied if the SINR value is equal to or lower than 3 dB.

If all of the mobile stations connected to the radio communication system RCS1 can be used for the joint scheduling and channel estimation and if the joint scheduling and channel estimation are configured as a standard procedure, the optional step M1/ is not necessarily required. 7.

In the next step M1/8, if the master unit BS-MU has decided to transmit the data D by the joint scheduling and channel estimation procedure, the master unit BS-MU can perform the joint scheduling and channel. The estimation program sets a duration timer. The duration timer determines how many consecutive time intervals and thereby determines how many data units of data D will be applied to the joint scheduling and channel estimation procedure. The size of one of the duration timers may depend, for example, on one of the mobile station MS's input buffer size and a time constant describing how fast the channel conditions between the cooperative cluster CC and the mobile station MS change.

The LTE physical layer specification allows the downlink carrier to consist of a group of neighboring PRBs from a minimum of 6 to a maximum of 110.

In a further step M1/9, the master control unit BS-MU allocates one of the first PRBs of the group of adjacent PRBs by the transmission of the first data unit at the first time interval and at the second time The second PRB of one of the groups of adjacent PRBs is allocated to the transmission of the second data unit, and a combined scheduling is performed on the first data unit and the second data unit.

Alternatively, if the duration timer comprises more than two time intervals, the master unit BS-MU assigns a further PRB to the transmission of the further data unit for the combined schedule.

In a further step M1/10, the master unit BS-MU is preferably A first scheduling information SCHED-INFO1 is transmitted to the mobile station MS on a control channel (such as a physical downlink control channel (PDCCH) in 3GPP LTE), and the mobile station MS receives the first in the next step M1/11 A schedule of information. The first schedule information SCHED-INFO1 includes a PRB indicating to the mobile station MS that the first time interval and the at least one second time interval will include the data D for the mobile station MS. Preferably, the first schedule information SCHED-INFO1 will be accompanied by the transmission mode information MODE-INFO. The transmission mode information MODE-INFO may indicate, for example, a common HARQ procedure by a "0" and indicate a single bit of the joint scheduling and channel estimation procedure by a "1". The transmission mode information MODE-INFO directs the mobile station MS to perform the joint channel estimation.

Further preferably, the first schedule information SCHED-INFO1 will be accompanied by the second interference information INTERF-INFO2. The second interference information INTERF-INFO2 indicates to the third radio cell BS-Cell-3 at the second base station BS2 at one or several next time intervals and during the first time interval and the second time interval The radio resources are used in the same frequency resource as applied to the mobile station MS. The second interference information INTERF-INFO2 may be a subset of the first interference information INTERF-INFO1 by including only interference information of frequency resources related to the mobile station MS.

Alternatively, the first schedule information SCHED-INFO1, the transmission mode information MODE-INFO, and the second interference information INTERF-INFO2 may be transmitted to the mobile station MS in a separate message form.

In a further step M1/12, the main control unit BS-MU transmits the second schedule information SCHED-INFO2, the first data unit DU1 and the at least one The second data unit DU2 to the first remote radio head RRH1, and in the next step M1/13, the first remote radio head RRH1 receives the second schedule information SCHED-INFO2, the first data unit DU1 and the at least one second data unit DU2. The second scheduling information SCHED-INFO2 indicates to the first remote radio head RRH1 that the first time interval and the at least one second time interval are applied to transmit the first data unit DU1 according to the multi-point transmission mode. The at least one second data unit DU2 to the PRB of the mobile station MS.

In the next step M1/14, the first base station BS1 and the first remote radio head RRH1 transmit the first data unit DU1 and the first data unit during the first time interval in the first PRB. The first reference signal RS1 of the DU1 to the mobile station MS, and in a further step M1/15 the mobile station MS receives the first data unit DU1 and the first reference signal RS1.

In the next step M1/16, the mobile station MS stores the received first data unit DU1 and the received first reference signal RS1 in a buffer or a memory.

In the next step M1/17, the first base station BS1 and the first remote radio head RRH1 transmit the second data unit DU2 and the second data in the second PRB during the second time interval. The second reference signal RS2 of the unit DU2 is to the mobile station MS, and in a further step M1/18 the mobile station MS receives the second data unit DU2 and the second reference signal RS2.

The first data unit can be transmitted in the same transmission format via the transmission channel DU1 and the second data unit DU2 to the mobile station MS. This means that the same data rate, the same coding scheme, the same modulation scheme and the same antenna mapping can be applied to the first data unit DU1 and the second data unit DU2. This can be done by summarizing the first PRB and the second PRB in a single transport block (for example, in the case of 3GPP LTE).

The first reference signal RS1 and the second reference signal RS2 may be, for example, known reference symbols, which may be inserted at a specific frequency subcarrier and have a frequency domain interval of six subcarriers. A PRB (such as a so-called cell-specific reference symbol (CRS) applied in 3GPP LTE) is one of the first to the first OFTS symbol and one to the third to the last OFTS symbol. This means, for example, that four first reference symbols can be transmitted during the first time interval and four second reference symbols can be transmitted during the second time interval.

Alternatively, if the duration timer includes more than two time intervals, the first base station BS1 and the first remote radio head RRH1 are also transmitted by the first data unit DU1 and the second data unit DU2. Transmitting at least one further data unit and transmitting at least a further reference signal for the at least further data unit in addition to transmitting the first reference signal RS1 and the second reference signal RS2. This is not shown in Figure 2 for the sake of simplicity.

Preferably, the first PRB and the at least one second PRB belong to 12 adjacent PRBs of the same group. This means that the first data unit and the at least one second data unit are preferably transmitted on the same frequency resource.

Alternatively, the resource allocation of the first data unit DU1 and the transmission of the scheduling information of the first data unit DU1 are separated, and the resource allocation to the second data unit DU2 and the second data are performed. Unit DU2 The scheduling information is transmitted before the transfer.

In a further step M1/19, the mobile station MS stores the received second data unit DU2 and the received second reference signal RS2 in the buffer or the memory.

In the next step M1/20, the mobile station MS estimates the transmission channel decision channel between the cooperative cluster CC and the mobile station MS based on the first reference signal RS1 and the second reference signal RS2. Alternatively, the mobile station MS determines the channel estimate based on the first reference signal, the second reference signals, and the at least one further reference signal.

The determining step M1/20 may be based on the first time interval and the space-time-frequency filtering within the second time interval.

For, for example, an OFDM system, one of the first pilot received signal vectors y ₁ at the location of the pilot resource element for the time instant 1 (for a particular antenna) of the first reference signal RS1 can be written as y ₁ = S ₁ h ₁ + n ₁ , where S ₁ contains one diagonal matrix of the pilot symbol resource elements, h ₁ is used for one of the radio channels of all pilots, and n ₁ contains noise and interference . Similarly, for the time instant 2 of the second reference signal RS2, a second pilot received signal vector y ₂ = S ₂ h ₂ + n ₂ . A joint reception vector for one of the two time instants can be written as a stack vector y ^{[ both ]} = [y ₁ ^T y ₂ ^T ] ^T .

A linear channel estimator is used as one of the pilot received signal vectors y ₁ , y ₂ (FIR = finite impulse response). Merely relying on one of the first time instants, the estimator estimates the channel of a particular antenna at a particular resource element k as ,among them The weight vector of the estimator. The estimator can be based, for example, on a least squares windowed average. Another powerful option is, for example, for example, from April 21 to 24, 1997, P. Hoeher, S. Kaiser, and P. Robertson in IEEE International Conference on Acoustics, Speech, and Signal Processing ICASSP-97. Volume 4, pages 1845 to 1848) Wiener filtering described in "Two-dimensional pilot-symbol aided channel estimation by Wiener filtering". Here, the weights additionally use the statistical channel properties, and in addition the statistical channel properties must be extracted from the signal. These weights can be calculated as = Θ _k ^T φ ^-1 , where Θ _k ^T denotes the cross-covariation vector between the data resource element k and the considered pilot symbol, and φ ^-1 denotes the inverse of the received signal between all considered pilot positions Self-co-variation matrix.

The present invention now allows channel estimation to be improved, for example, at a first time instant by buffering the input signal and using at least a second time instant received signal (hence, y ^{[ both ]} ). Best estimate now This is because it relies significantly on more pilot symbols and thus provides improved accuracy.

In a further step M1/21, the mobile station MS recovers the first data unit DU1 and the second data unit DU2 based on the channel estimation. This recovery can be accomplished by a conventional equalizer, demapper, and channel forward error correction (FEC) decoder.

In the next step M1/22, the mobile station MS depends on one of the restoration steps M1/21 of the first data unit DU1 and/or the second data unit DU2 to be restored without error or without error. The first data unit DU1 and the second data unit DU2 transmit a positive or negative response. In one In a step M1/23, the master unit BS-MU of the first base station BS1 receives the positive or negative acknowledgements from the mobile station MS.

In a first alternative, if the first data unit DU1 and the second data unit DU2 have been recovered without error, a combined acknowledgement ACK can be transmitted, and if the first data unit is recovered without error Both DU1 and the second data unit DU2 can transmit a combined negative acknowledgement NACK.

In a second alternative, the individual acknowledgement ACK1, ACK2 and the separate for the first data unit DU1 and the second data unit DU2 may be transmitted by the mobile station MS depending on the result of the recovery step M1/21. Negative responses NACK1, NACK2.

Referring now to Figure 3, there is shown a block diagram of one of the base stations BS used in the radio communication network RCS1. The base station BS can be, for example, the first base station BS1 or the second base station BS2 shown in FIG.

The base station BS may comprise an antenna system BS-AS, a first transceiver BS-TR1 connected to the antenna system BS-AS, a first external connector BS-CON1, and an internal connection to the first external connection a second transceiver BS-TR2, a second external connector BS-CON2, a second external connector BS-CON2, a transmitter BS-TM internally connected to the second external connector BS-CON2, and the main control unit BS -MU.

The main control unit BS-MU may be, for example, a digital baseband processing board having a base station BS for a coordinated multipoint transmission, and may include a CPU (CPU=Central Processing Unit) BS- CPU and a computer readable medium BS-MEM. In an alternative, if the coordinated multipoint transmission is not applied in the radio communication system RCS1, the digital baseband processing board may not be the main control unit.

The antenna system BS-AS can be, for example, the first antenna system BS1-AS or the second antenna system BS2-AS, and can include a first antenna element BS-AE1, a second antenna element BS-AE2, a third antenna element BS-AE3 and a fourth antenna element BS-AE4. In a further alternative, the antenna system BS-AS may comprise one, two, three antenna elements or more than four antenna elements.

It is foreseen that the CPU BS-CPU is used to execute a computer readable program BS-PROG.

In the downlink direction, the first transceiver BS-TR1 and the antenna system BS-AS can transmit the first scheduling information SCHED-INFO1, the transmission mode information MODE-INFO, and the second interference information INTERF- INFO2, the first data unit DU1, the first reference signal RS1, the second data unit DU2, and the second reference signal RS2.

In an uplink direction, the antenna system BS-AS and the first transceiver BS-TR1 may receive the capability information CAP-INFO, the individual acknowledgement ACK1, ACK2 or the combination acknowledgement ACK or the separate Negative acknowledgement NACK1, NACK2 or the combined negative acknowledgement NACK.

The first connector BS-CON1 and the second transceiver BS-TR2 can receive the data D from the core network node of the radio communication system RCS1 and receive the first interference information INTERF-INFO1 from a neighboring base station. The second transceiver BS-TR2 can transmit the third interference information INTERF-INFO3 to the neighboring base station. Similar to the first interference information INTERF-INFO1, the third interference information INTERF-INFO3 may be indicated at the base station BS at one or several next time intervals for one of the radio cells of the base station BS or Several use radio resources.

The transmitter BS-TM and the second connector BS-CON2 can transmit the second schedule information SCHED-INFO2, the first data unit DU1 and the second data unit DU2.

It is foreseen that the computer readable medium BS-MEM is for storing the computer readable program BS-PROG, and can store the data D, the first interference information INTERF-INFO1 and the capability information CAP-INFO.

It is foreseen that the computer readable program BS-PROG is used to perform the steps of the method MET1 for the base station BS.

Referring to Figure 4, a block diagram of one of the mobile stations MS used in the radio communication network RCS1 is shown. The mobile station MS may comprise an antenna system MS-AS, a transceiver MS-TR, a CPU connected to the antenna system MS-AS (CPU=Central Processing Unit) MS-CPU and a computer readable medium MS-MEM . The CPU MS-CPU and the computer readable medium MS-MEM may be based on a digital baseband processing board of the mobile station MS. It is foreseen that the CPU MS-CPU is used to execute a computer readable program MS-PROG.

The antenna system MS-AS can comprise a first antenna element MS-AE1 and a second antenna element MS-AE2. Alternatively, the antenna system MS-AS may comprise an antenna element or more than two antenna elements.

In the downlink direction, the antenna system MS-AS and the transceiver MS-TR can receive the first scheduling information SCHED-INFO1, the second interference information INTERF-INFO2, the transmission mode information MODE-INFO, The first data unit DU1, the first reference signal RS1, the second data unit DU2, and the second reference data RS2.

In the uplink direction, the transceiver MS-TR and the antenna system MS-AS may transmit the capability information CAP-INFO, the individual acknowledgement ACK1, ACK2 or the combined acknowledgement ACK or the separate negative acknowledgements NACK1, NACK2 or the combination negative acknowledges NACK.

It is foreseen that the computer readable medium MS-MEM is used for storing the computer readable program MS-PROG, and can store the first schedule information SCHED-INFO1, the second interference information INTERF-INFO2, and the first data unit DU1 The first reference signal RS1, the second data unit DU2, and the second reference data RS2.

It is foreseen that the computer program MS-PROG is used to perform the steps of the method MET1 for the mobile station MS.

Those skilled in the art will readily recognize the steps of performing the various methods MET1 described above by a stylized computer. Some embodiments herein are also intended to encompass a program storage device (eg, a digital data storage medium), such as a machine readable or computer readable and encoded machine executable or computer executable instruction program, wherein the instructions perform such Some or all of the above methods. The program storage devices can be, for example, digital memory, magnetic storage media (such as magnetic disks and magnetic tapes, hard disks) or as desired data storage media. The embodiments are also intended to encompass a computer that is programmed to perform the steps of the methods described above.

This description and the drawings are merely illustrative of the principles of the invention. It will be appreciated that those skilled in the art will be able to devise various embodiments of the present invention. Moreover, all the examples described in this article are clearly intended to be used only in principle. The teachings are intended to assist the reader in understanding the principles of the present invention and the concept of the inventors to facilitate the present invention and are not to be construed as limited to the details. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention and the specific examples of the invention are intended to be

Functional blocks labeled as "means for" (performing a function) will be understood to include functional blocks that are respectively suitable for the circuitry for performing a function. Therefore, a "component for things" can also be understood as a "component suitable for or applicable to things." Therefore, a component suitable for performing a function does not imply that such a component must perform the function (at a given moment in time).

Through the use of dedicated hardware (such as "one receiver", "one validator", "one determiner", "one transmitter", "one actuator or one processor", "one scheduler") The hardware capable of executing the software in conjunction with the appropriate software provides the various components shown in the drawings (including the components labeled "components", "components for receiving", "components for verification", and "components for determination" The functions of "components used for transmission", "components for execution", "components used for scheduling", and "function blocks for guidance". When the functions are performed by a processor, the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors (some of which may be shared). Moreover, the explicit use of the terms "processor" or "controller" should not be interpreted as exclusively referring to hardware capable of executing software, and may implicitly include (unrestricted) digital signal processor (DSP) hardware. , network processor, application-specific integrated circuit (ASIC), long programmable gate array (FPGA), read-only memory for storing software (ROM), random access memory (RAM), and non-volatile storage. Other conventional and/or general hardware may also be included. Similarly, any of the switches shown in these figures are merely conceptual. The functions of the switches may be implemented through the operation of the program logic, through the dedicated logic, through the interaction of the program control and the dedicated logic, or even by the implementer's manual selection of specific techniques that are more specifically understood from the context.

Those skilled in the art should understand that any block diagram herein represents a conceptual diagram of an illustrative circuit embodying the principles of the invention. Similarly, it will be understood that any flow flow, flow diagram, state transition diagram, pseudocode, etc., is generally represented in a computer readable medium and thus executed by a computer or processor (regardless of whether the computer or processor is clear Show) various processing procedures.

ACK (NACK) ‧ ‧ combination positive response (combined negative response)

ACK1 (NACK1) ‧ ‧ separate positive response (individual negative response)

ACK2 (NACK2) ‧ ‧ separate positive response (individual negative response)

BS1‧‧‧First Network Node/First Base Station

BS2‧‧‧Second base station

BS-AS‧‧‧Antenna System

BS-MU‧‧‧Second master unit

BS-SU‧‧‧Secondary slave unit

BS1-AS‧‧‧First Antenna System

BS1-L1‧‧‧First transmission path

BS2-AS‧‧‧3rd antenna system

BS-AE1‧‧‧First antenna element

BS-AE2‧‧‧Second antenna element

BS-AE3‧‧‧3rd antenna element

BS-AE4‧‧‧4th antenna element

BS-CON1‧‧‧ first connector

BS-CON2‧‧‧Second connector

BS-CPU‧‧‧Central Processing Unit

BS-TM‧‧‧Transmitter

BS-TR1‧‧‧ first transceiver

BS-TR2‧‧‧Second transceiver

BS-MEM‧‧‧Computer-readable media

BS-PROG‧‧‧Computer readable program

CC‧‧‧Collaborative Cluster

CAP-INFO‧‧‧Function Information

D‧‧‧Information

DU1‧‧‧ first data unit

DU2‧‧‧Second data unit

INTERF-INFO1‧‧‧First interference information

INTERF-INFO2‧‧‧Second interference information

MS‧‧‧Second network node

MODE-INFO‧‧‧Transport mode information

MS-AE1‧‧‧First antenna element

MS-AE2‧‧‧Second antenna element

MS-AS‧‧‧Antenna System

MS-CPU‧‧‧Central Processing Unit

MS-MEM‧‧‧Computer-readable media

MS-PROG‧‧‧ computer readable program

MS-TR‧‧‧ transceiver

RAN1‧‧‧ radio access network

RCS1‧‧‧ Radio Communication System

RRH1‧‧‧ first remote radio head

RRH1-AS‧‧‧second antenna system

RRH-Cell-1‧‧‧First Radio Community

RRH-Cell-2‧‧‧Second Radio Community

RRH-Cell-3‧‧‧ third radio cell

RRH-SU‧‧‧ first slave unit

RRH1(SU)‧‧‧first remote radio head (slave unit)

RS1‧‧‧ first reference signal

RS2‧‧‧ second reference signal

SCHED-INFO1‧‧‧First Schedule Information

SCHED-INFO2‧‧‧Second Schedule Information

Figure 1 shows schematically a block diagram of a radio communication network.

Figure 2 is a schematic flow diagram showing a method of execution between network nodes of a radio communication network.

Figure 3 is a block diagram showing one of the base stations used in a radio communication network.

Figure 4 is a block diagram showing one of the mobile stations used in a radio communication network.

ACK (NACK) ‧ ‧ combination positive response (combined negative response)

ACK1 (NACK1) ‧ ‧ separate positive response (individual negative response)

ACK2 (NACK2) ‧ ‧ separate positive response (individual negative response)

BS1‧‧‧First Network Node/First Base Station

BS2‧‧‧Second base station

CAP-INFO‧‧‧Function Information

DU1‧‧‧ first data unit

DU2‧‧‧Second data unit

INTERF-INFO1‧‧‧First interference information

INTERF-INFO2‧‧‧Second interference information

MS‧‧‧Second network node

MODE-INFO‧‧‧Transport mode information

RRH1(SU)‧‧‧first remote radio head (slave unit)

RS1‧‧‧ first reference signal

RS2‧‧‧ second reference signal

SCHED-INFO1‧‧‧First Schedule Information

SCHED-INFO2‧‧‧Second Schedule Information

Claims (13)

A method (MET1) for transmitting data in a communication system (RCS1), the communication system (RCS1) comprising a first network node (BS, BS1), the method (MET1) comprising the steps of: Transmitting first information (MODE-INFO) from the first network node (BS, BS1) to a second network node (MS) to apply the same frequency resource and direct the same time interval and at least one second time interval a second network node (MS) based on the first reference signal (RS1) and based on the second reference signal (RS2) between the first network node (BS, BS1) and the second network node (MS) A transmission channel determines a channel estimate and recovers a first data unit (DU1) and a second data unit (DU2) (M1/10) based on the channel estimate, the same frequency resource during the first time interval Transmitting the first data unit (DU1) and the first reference signal (RS1) from the first network node (BS, BS1) to the second network node (MS) (M1/14), The second data unit (DU2) and the second reference signal (RS2) are temporally on the same frequency resource during the at least one second time interval after the first time interval Transmitting from the first network node (BS, BS1) to the second network node (MS) (M1/17), based on the first reference signal (RS1) at the second network node (MS) And determining, according to the at least one second reference signal (RS2), the channel estimate (M1/20) of the transmission channel between the first network node (BS, BS1) and the second network node (MS) Recovering the first based on the channel estimate at the second network node (MS) Data unit (DU1) and second data unit (DU2) (M1/21). The method of claim 1 (MET1), wherein the method further comprises the step of: executing the first data unit (DU1) and the second data unit (DU2) at the first network node (BS, BS1) a combined schedule (M1/9), and storing the first data unit (DU1), the second data unit (DU2), and the first reference signal (RS1) at the second network node (MS) And the at least second reference signal (RS2) (M1/16, M1/19), and wherein if all the data units (DU1, DU2) of the combined schedule have been received at the second network node (MS), Then the recovery step (M1/21) is performed. The method of claim 2 (MET1), wherein the method further comprises verifying at the first network node (BS, BS1) whether the step (M1/9) of the performing step (M1/9) should be performed, and wherein The verification is based on at least one of the following conditions: the first network node (RAN1-M2) receives the third information (CAP-INFO), and wherein the third information (CAP-INFO) indicates the second network The node (MS) performs one of the determining steps (M1/18) for recovering at least the first data unit (DU1) and the second data unit (DU2) at the second network node (MS) One of the first ones has a time delay equal to or lower than a first predefined threshold, and one of the first data unit (DU1) and the second data unit (DU2) has a data rate equal to or Above a second predefined threshold, the first data unit (DU1) and the second data unit are transmitted from at least two antenna systems (BS1-AS, RRH1-AS) in a multi-point transmission mode. (DU2), at one of the second network nodes (MS), one of the received data units has a signal to interference ratio equal to or lower than a third predefined threshold. The method of claim 1 (MET1), wherein the communication system (RCS1) further comprises a third network node (BS, BS2), and wherein the method (MET1) further comprises the step of: placing the second information (INTERF- INFO1) transmitted from the third network node (BS, BS2) to the first network node (BS, BS1), the second information (INTERF-INFO1) indicating the first time interval and the at least one second The time interval uses radio resources (M1/4) at the third network node (BS, BS2), and transmits the second information (INTERF-INFO1) from the first network node (BS, BS1) to the Second network node (MS) (M1/10). The method of claim 4 (MET1), wherein the third network node (BS, BS2) comprises an antenna array, and wherein the second information (RES-UTIL-INFO) further indicates the same frequency resource and The first time interval and the at least one second time interval use the same precoding weights applied to the antenna array. The method of claim 4 (MET1), wherein the first data unit (DU1) and the at least one second data unit (DU2) are transmitted in a single transport block including a single MAC header. The method of claim 4 (MET1), wherein the determining step (M1/20) is based on the first time interval and one of the at least one second time interval spatial-temporal-frequency filtering. The method of claim 1 (MET1), wherein the same frequency resource is an entity resource block or a group of adjacent entity resource blocks. The method of claim 1 (MET1), wherein the first time interval is a first long term evolution (LTE) subframe, and wherein the second time interval is a second LTE subframe. A first network node (BS1, BS2) used in a communication system (RCS1), the first network node (BS1, BS2) comprising: for first information (MODE-INFO) from the first The network node (BS, BS1) transmits to a second network node (MS) to apply the same frequency resource at a first time interval and at least a second time interval, and is used to guide the second network node (MS) Estimating a channel based on the first reference signal (RS1) and based on the second reference signal (RS2) to transmit a channel between the first network node (BS, BS1) and the second network node (MS) And determining, based on the channel estimation, a component (BS-CPU, BS-PROG, BS-TR1, BS-AS) for recovering a first data unit (DU1) and a second data unit (DU2), and for Transmitting the first data unit (DU1) and the first reference signals (RS1) to the second network node (MS) on the same frequency resource during the first time interval and in the first time in the first time interval The second data unit (DU2) and the second reference signal (RS2) are transmitted to the second network node (MS) during the at least one second time interval after the time interval (BS-TR1, BS- AS ). The first network node (BS1, BS2) of claim 10, wherein the first network node (BS1, BS2) is a base station. A second network node (MS) for use in a communication system (RCS1), the second network node (MS) comprising: for a first time interval and at least a second time interval from a first time The network node (BS, BS1) receives the first information (MODE-INFO) to apply the same frequency resource, and is used to guide the second network node (MS) to be based on the first reference signal (RS1) and based on the second reference signal (RS2) determining a channel estimate for a transmission channel between the first network node (BS, BS1) and the second network node (MS), and restoring a first data unit based on the channel estimation ( a component (MS-AS, MS-TR) of the DU1) and a second data unit (DU2) for using the first network node (BS1, BS2) on the same frequency resource during the first time interval Receiving the first data unit (DU1) and the first reference signals (RS1) and receiving the second data unit (DU2) during the at least one second time interval after the first time interval in time a component (MS-AS, MS-TR) of the second reference signal (RS2) for the first reference signal (RS1) based on the first reference signal (RS1) and based on the second reference signal (RS2) The transmission channel between the network node (BS1, BS2) and the second network node (MS) determines the component of the channel estimation (MS-CPU, MR-PROG), and restores the first based on the channel estimation A data unit (DU1) and a component of the second data unit (DU2) (MS-CPU, MR-PROG). The second network node (MS) of claim 12, wherein the second network node (MS) is a mobile station.