JP2022003807A - User equipment, base station, user equipment method, and base station method - Google Patents

Abstract

To provide a method and a device for transmitting and receiving reference signals in a wireless communication system.SOLUTION: A common reference signal sequence is generated on the basis of a frequency range configuration on the network side, and is shared with at least some devices to which their own reference signal transmission configuration are allocated. The common reference signal sequence and sequence configuration information are transmitted to the terminal device. The sequence configuration information indicates a parameter that can acquire the reference signal sequence transmitted to the terminal device.EFFECT: A low complexity reference signal sequence solution has been proposed for a wireless communication system (especially new wireless access system) with dynamic bandwidth allocation and/or a configurable reference signal pattern, and only one common reference signal sequence is generated and shared by at least some terminal devices.SELECTED DRAWING: Figure 4

Description

Non-limiting and exemplary embodiments of the present disclosure relate generally to the field of wireless communication technology, and more particularly to methods and devices for transmitting and receiving reference signals in wireless communication systems.

The new wireless access system, also called the NR system or network, is the next generation communication system. The study of NR systems was approved at the Radio Access Network (RAN) # 71 Conference for the 3rd Generation Partnership Project (3GPP) Working Group. The NR system considers frequencies up to 100 GHz for a single technical framework that addresses all usage scenarios, requirements, and deployment scenarios defined in Technical Report TR 38.913, which includes extended mobile. Includes requirements such as broadband, large machine type communications, ultra-reliability and low latency communications.

The initial work of this research item should assign high priority to gaining a common understanding of what is required of the structure and architecture of wireless protocols and focus on progress in the following areas:
-Basic physical layer signal structure for the new RAT-ODM-based waveforms, non-orthogonal waveforms and potential support for multi-access-FFS: Other waveforms showing legitimate gain-Basic frame structure-Channels Coding method

In addition, it is necessary to study and identify the technical features required to enable new wireless access, such as:
Efficient multiplexing of traffic for different services and use cases on the same contiguous spectral block

In addition, dynamic / flexible bandwidth allocation and configurable RS patterns (including density) were also agreed in RAN1.

Dynamic / flexible bandwidth allocation means that dynamic / flexible and UE-specific bandwidth allocation is supported in NR. Therefore, in such cases, the UE does not know the total system bandwidth on the network side, different UEs may require different reference signal sequences, and shared RS for UEs using existing RS sequence generation solutions. It is not possible to generate a sequence. On the other hand, RS patterns can also be configurable (eg, configurable densities in the time / or frequency domain), and therefore legacy RS sequences meet the requirements for different patterns, especially with respect to multi-user scheduling. Can't.

The present disclosure provides new solutions for transmitting and receiving reference signals in wireless communication systems in order to mitigate or at least alleviate at least some of the problems in the prior art.

According to the first aspect of the present disclosure, a reference signal transmission method in a wireless communication system is provided. This method generates a common reference signal sequence shared by at least some of the terminal devices to which each of their own reference signal transmission configurations is assigned, based on the frequency range configuration on the network side, and the common reference signal. The sequence and the sequence configuration information include transmitting the sequence and the sequence configuration information to the terminal device, and the sequence configuration information indicates a parameter capable of acquiring an initial reference signal sequence transmitted to the terminal device.

According to the second aspect of the present disclosure, a method of receiving a reference signal is provided in a wireless communication system. This method receives a reference signal sequence transmitted from the network side and sequence configuration information indicating parameters for acquiring an initial reference signal sequence transmitted to the terminal device, and the sequence configuration. It comprises acquiring an initial reference signal sequence for the terminal device based on the information.

According to the third aspect of the present disclosure, a device for transmitting a reference signal in a wireless communication system is provided. The device includes a reference signal generation module and a sequence and information transmission module. The reference signal generation module is configured to generate a common reference signal sequence shared by at least some of the terminal devices each assigned their own reference signal transmission configuration, based on the frequency range configuration on the network side. Ru. The sequence and information transmission module is configured to transmit the common reference signal sequence and the sequence configuration information to the terminal device, and the sequence configuration information acquires the initial reference signal sequence transmitted to the terminal device. Indicates the parameters that can be used.

According to the fourth aspect of the present disclosure, a device for receiving a reference signal is provided in a wireless communication system. The device includes a sequence and signal receiving module and a sequence acquisition module. The sequence and signal receiving module is configured to receive a reference signal sequence transmitted from the network side and sequence configuration information indicating parameters for acquiring an initial reference signal sequence transmitted to the terminal device. Will be done. The sequence acquisition module is configured to acquire the initial reference signal sequence for the terminal device based on the sequence configuration information.

According to a fifth aspect of the present disclosure, a computer-readable storage medium embodying a computer program code is provided, and when the computer program code is executed, it is within the method according to any embodiment of the first aspect. Is configured to cause the device to perform the operation of.

According to a sixth aspect of the present disclosure, a computer-readable storage medium embodying a computer program code is provided, and when the computer program code is executed, it is within the method according to any embodiment of the second aspect. Is configured to cause the device to perform the operation of.

According to a seventh aspect of the present disclosure, a computer program product comprising a computer-readable storage medium according to the fifth aspect is provided.

According to an eighth aspect of the present disclosure, a computer program product comprising a computer-readable storage medium according to the sixth aspect is provided.

In embodiments of the present disclosure, less complex reference signal sequence solutions are proposed for wireless communication systems (particularly new wireless access systems) with dynamic bandwidth allocation and / or configurable reference signal patterns. The common reference signal sequence is generated and shared by at least some terminal devices regardless of the reference signal transmission configuration such as bandwidth allocation and / or reference signal pattern configuration. Thus, it is possible to perform RS measurements and multi-user scheduling for the UE even if they are configured with different bandwidth allocations and / or configurable reference signal patterns. In addition, it is possible to achieve better interference elimination because the reference signal from the interference cell is more likely to be obtained. In addition, the terminal device only needs to generate a small number (eg, only one) reference signal sequence for different bandwidth allocations and / or RS pattern configurations, which means a less complex solution. ..

The above and other features of the present disclosure will become more apparent through a detailed description of the embodiments shown in the embodiments with reference to the accompanying drawings. Throughout the drawing, the same reference numbers represent the same or similar components.

FIG. 1 schematically shows a system bandwidth configuration in an LTE system.

FIG. 2 schematically illustrates an example of potential problems associated with dynamic bandwidth allocation in NR systems.

FIG. 3 schematically shows an example of potential problems associated with a configured RS pattern in an NR system.

FIG. 4 schematically shows a flowchart of a method for transmitting a reference signal according to an exemplary embodiment of the present disclosure.

FIG. 5 schematically shows a common RS sequence and RS sequence for each UE with different frequency band allocations according to an exemplary embodiment of the present disclosure.

FIG. 6 schematically illustrates the generation of an exemplary common RS sequence according to another embodiment of the present disclosure.

FIG. 7 schematically illustrates the generation of an exemplary common RS sequence using a fixed index according to a further embodiment of the present disclosure.

FIG. 8 schematically illustrates the generation of an exemplary common RS sequence using a fixed index, according to yet a further embodiment of the present disclosure.

FIG. 9 schematically illustrates an exemplary common RS sequence for UEs with configurable RS patterns according to still further embodiments of the present disclosure.

FIG. 10 schematically shows a common RS sequence and an RS sequence for each UE with different RS densities according to one embodiment of the present disclosure.

FIG. 11 schematically shows a common RS sequence and an RS sequence for each UE with different RS configurations in the time domain, according to another exemplary embodiment of the present disclosure.

FIG. 12 schematically shows a common RS sequence and RS sequence for each UE with different band allocations in the frequency domain and different RS configurations in the time domain, according to another exemplary embodiment of the present disclosure.

FIG. 13 schematically shows different variable modes of modulation symbols in an RS sequence according to an embodiment of the present disclosure. FIG. 14 schematically shows different variable modes of modulation symbols in an RS sequence according to an embodiment of the present disclosure. FIG. 15 schematically shows different variable modes of modulation symbols in an RS sequence according to an embodiment of the present disclosure.

FIG. 16A schematically shows the generation of a common RS sequence for symbols of different densities according to one embodiment of the present disclosure. FIG. 16B schematically shows the generation of a common RS sequence for symbols of different densities according to one embodiment of the present disclosure.

FIG. 17 schematically shows a flowchart of a method for receiving a reference signal according to an embodiment of the present disclosure.

FIG. 18 schematically shows a block diagram of an apparatus for transmitting a reference signal according to an embodiment of the present disclosure.

FIG. 19 schematically shows a block diagram of an apparatus for receiving a reference signal according to an embodiment of the present disclosure.

FIG. 20 shows a device 2010 that can be embodied or included as a serving node such as a base station in a wireless network and a terminal device as described herein as such as a UE. Further shown is a simplified block diagram of the device 2020, which can be embodied or included therein.

The solutions provided in the present disclosure will be described in detail through embodiments with reference to the accompanying drawings. It should be understood that these embodiments are presented only to allow one of ordinary skill in the art to better understand and implement the disclosure and are not intended to limit the scope of the disclosure in any way. ..

In the accompanying drawings, various embodiments of the present disclosure are shown in block diagrams, flow charts and other diagrams. Each block within a flowchart or block can represent part of a module, program, or code that contains one or more executable instructions to perform a particular logical function, and in this disclosure, unnecessary blocks are referred to. Shown by the dotted line. Moreover, although these blocks are shown in a particular order for performing the steps of the method, in practice they do not necessarily have to be performed in the exact order shown. For example, they may be executed in reverse order or at the same time, depending on the nature of their respective actions. Each block in the block diagram and / or flowchart, and combinations thereof, are implemented by a dedicated hardware-based system to perform a particular function / operation, or by a combination of dedicated hardware and computer instructions. obtain.

In general, all terms used in the claims should be construed according to their usual meaning in the art, unless otherwise explicitly defined herein. All references to "a / an / the / side [elements, appliances, components, means, steps, etc.]" are openly intended to refer to at least one example of said element, device, component, means, unit, etc. It should be construed as, unless otherwise specified, without excluding a plurality of such devices, components, means, units, steps, etc. Moreover, the indefinite articles "a / an" used herein do not exclude a plurality of such steps, units, modules, devices, objects, and the like.

Further, in the context of the present disclosure, a user equipment (UE) is a terminal, a mobile terminal (MT), a subscriber station, a mobile subscriber station, a mobile station (MS: Mobile Station), or an access terminal. (AT: Access Terminal) may refer to, and may include some or all of the functions of a UE, terminal, MT, SS, mobile subscriber station, MS, or AT. Further, in the context of the present disclosure, the term "BS" is used, for example, node B (NodeB or NB), advanced node B (eNodeB or eNB), gNB (NodeB in NR), radio header (RH). , Remote Radio Head (RRH), relay, or low power node such as femto, pico.

In the following, in order to facilitate the understanding of the embodiments of the present disclosure, the channel state information-reference signal (CSI-RS) sequence generation in the LTE system will be first described.

は、以下によって定義される。

ここで、ｎ_ｓは無線フレーム内のスロット番号であり、

はスロット内のＯＦＤＭのシンボル番号である。c（i）は擬似乱数列生成器によって生成された擬似乱数列で、次のように初期化される。

各ＯＦＤＭシンボルの先頭に以下が付加される。

そして、ここで、量

がよりレイヤの高い層によって構成されない場合、量

は

に等しい。 According to the generation of CSI-RS in LTE, the reference signal sequence

Is defined by:

Here, n _s is a slot number in the wireless frame.

Is the OFDM symbol number in the slot. c (i) is a pseudo-random number sequence generated by the pseudo-random number sequence generator, which is initialized as follows.

The following is added to the beginning of each OFDM symbol.

And here, the quantity

Amount if is not composed of higher layers

teeth

be equivalent to.

は、以下に従ったアンテナポートｐ上の基準シンボルとして使用される複素数値変調シンボル

にマッピングされるものとする。

In subframes configured for CSI reference signal transmission, the reference signal sequence

Is a complex numerically modulated symbol used as a reference symbol on antenna port p according to

It shall be mapped to.

Therefore, it is clear that the CSI-RS sequence is _{generated with a fixed maximum length N RB} ^{max, DL} and a set length N _RB ^DL. The configuration length _NRB ^DL is associated with the system bandwidth configuration in the network.

Index for CSI-RS sequence generator is known to ^{_UE, N RB _max, DL} is fixed to _{110, N} ^{RB DL} is the physical broadcast channel: obtained from (PBCH Physical Broadcast CHannel), CSI -RS is It is a full band one. Therefore, the generated CSI-RS can be shared by all UEs in the cell.

Therefore, in an LTE system, the CSI-RS sequence is generated with a fixed maximum length, and as shown in FIG. 1, each of the six different configurations of system bandwidth has the same center frequency and the generated CSI-RS. The sequence is fixed. Therefore, for the same cell ID, the CSI-RS sequence is common to all UEs in the cell.

However, things will be different in the NR system. As mentioned above, dynamic / flexible bandwidth allocation is supported in NR systems, so the UE is unaware of the total system bandwidth on the network side. In addition, different UEs may require different reference signal sequences because different UEs may be assigned different frequency bands. With existing RS sequence generation solutions, it is not possible to generate a single RS sequence that can be shared for the UE.

FIG. 2 shows an example of potential problems associated with dynamic bandwidth allocation in NR systems. As shown in FIG. 2, there are three different UEs, namely UE1, UE2, and UE3, which are located in the same cell but are configured in the UE-specific frequency band for scheduling / measurement. Each of them is only a part of the total system bandwidth set on the network side. As shown in FIG. 2, the frequency bands of different UEs may be separated and may partially or completely overlap. From the UE's point of view, the bandwidth allocation should be obvious, as its total bandwidth depends on the RF function and it is not essential to know the system bandwidth on the network side.

In such cases, RS configuration with dynamic bandwidth allocation can cause some problems. For example, for a cell or beam specific RS, it shall be common or shared by a group of UEs, such as RS for CSI measurements. In addition, considering multi-user MIMO scheduling, demodulation RS should also be unified for orthogonal co-scheduling. RS sequences should be able to be known to other UEs for advanced interference elimination, even for different sequences of RS for quasi-orthogonal or inter-cell / intra-cell interference management. In such cases, RS configuration with dynamic bandwidth allocation would not allow RS sharing, but would be a problem.

Further, in the NR system, the UE can be configured with a UE-specific RS pattern (eg, UE-specific RS density) in the time / frequency domain. In such cases, it is also impossible to share a common RS with existing RS generation solutions. However, since the UE can extract the required RS from the common sequence, common RS generation can often also be useful, especially when the RS pattern is dynamically changed. In addition, a common sequence can facilitate multi-user scheduling.

しかしながら、そのような場合、図３に示されるように、異なるＲＳパターンに対して直交性は保証され得ず、これは各ＵＥに対するチャネルＨ１およびＨ２が推定できないことを意味する。さらに、各ＵＥは、他のＵＥに干渉を引き起こす可能性があり、高度なＵＥでは、他のＵＥからの干渉を差し引くことができない。したがって、レガシーＲＳシーケンス生成は、異なるＲＳパターン、特にマルチユーザスケジューリングのために、要件も満たすことができない。 As shown in FIG. 3, when the UE generates their RS sequences separately, the signals received on the RE are Y ₁ and Y ₂ , which are represented as follows, respectively.

However, in such cases, as shown in FIG. 3, orthogonality cannot be guaranteed for different RS patterns, which means that channels H1 and H2 for each UE cannot be estimated. In addition, each UE can cause interference to other UEs, and advanced UEs cannot deduct interference from other UEs. Therefore, legacy RS sequence generation also cannot meet the requirements due to different RS patterns, especially multi-user scheduling.

In view of the above, the present disclosure proposes a common RS sequence design solution independent of UE bandwidth or RS pattern configuration. The common RS sequence design allows groups of UEs with their own RS transmit configuration to share a common RS sequence such as their RS for measurement and multi-use scheduling. In addition, it may achieve better interference elimination, as RS from the interference cell is more likely to be obtained. In addition, the UE only needs to generate several sequences (eg, only one) for different bandwidth allocation / pattern configurations, which means less complexity in RS sequence generation.

In the following, with reference to the accompanying drawings, solutions for reference signal transmission and reception as proposed herein will be described. However, it should be noted that these explanations are for illustrative purposes only and the present disclosure is not limited thereto.

First, with reference to FIG. 4, it schematically shows a flowchart of a reference signal transmission method 400 in a wireless communication system according to an embodiment of the present disclosure. Method 400 can be performed, for example, in a serving node such as BS, node B (NodeB or NB).

As shown in FIG. 4, first, in step 401, a common reference signal sequence is generated based on the frequency range configuration on the network side, and the common reference signal is assigned at least their own reference signal transmission configuration to each other. Can be shared by several terminal devices.

In one embodiment of the present disclosure, a common reference signal sequence is generated on the network side based on the system bandwidth. In other words, the length of the common reference signal sequence is determined at least based on the total system bandwidth on the network side.

As shown in FIG. 5, the common reference signal sequence R_i consists of R_0, R_1, R_2, ..., R_M-2, R_M-1, where M is the length of the reference signal R_i and which is the system bandwidth on the network side. At least relevant. Moreover, it may also be further related to the minimum subcarrier interval (SCS).

、ｃｅｌｌ＿ＩＤ Ｎ^ＩＤ、ＵＥ＿ＩＤ Ｕ^ＩＤ、ＣＰタイプＮ_ＣＰ、ＳＣＳ構成のインデックスＮ_ＳＣＳ、リンクタイプＮ_{ｌｉｎｋ＿ｔｙｐｅ}等の少なくとも一つに関連するパラメータを用いて計算することができる。以下、本開示の例示的な実施形態では、Ｃ＿ｉｎｉｔを決定することができる。

ここで、ａ_ｉは各要素の係数であり、ｉ＝０、１、…、であり、パラメータ数Ｎ_ＳＣＳは、サブキャリア間隔構成のパラメータであり、Ｎ_ＳＣＳの値は、一組の値から選択することができ、サブキャリア間隔に対応する各値Ｎ_{ｌｉｎｋ＿ｔｙｐｅ}は、初期値がダウンリンク、アップリンク、またはサイドリンクであることを示すリンクタイプのパラメータである。端末装置の少なくともいくつかについては、それらは同じＵ^ＩＤを割り当てられ、したがって、それらは生成されたＲＳシーケンスを共有することができることに留意されたい。 The sequence R_i can be defined by a pseudo-random sequence that can be initialized with the initial value C_init by the pseudo-random sequence generator. The initial value C_init is the slot index n _s and the symbol index.

, ^{Cell_ID N ID} , UE_ID U ^ID , CP type N _CP , SCS configuration index N _SCS , link type N _{link_type,} etc. can be used for calculation. Hereinafter, in an exemplary embodiment of the present disclosure, C_init can be determined.

Here, a _i is a coefficient of each element, i = 0, 1, ..., The number of parameters N _SCS is a parameter of the subcarrier interval configuration, and _{the value of N SCS} is from a set of values. _{Each value N link_type} that can be selected and corresponds to the subcarrier interval is a link type parameter indicating that the initial value is downlink, uplink, or sidelink. For at least some of the terminal device, they are assigned the same U ^ID, therefore, they should be noted that it is possible to share the generated RS sequence.

In one embodiment of the present disclosure, the following table can be used to show the subcarrier spacing configuration.
Table 1 Subcarrier interval configuration example

For the link type parameter N _{link_type} , the following table can be used as a method for indicating the link type.
Table 2 Link type display example

For downlinks or uplinks, the RS sequence is symmetric and the sequence is generated with different initial values.

Therefore, in a common RS sequence with a length M as shown in FIG. 5, for different UEs with different bandwidth configurations, eg, those configured with different frequency ranges / positions within the system frequency band, Each RS sequence starts at a different index of the common RS sequence and has different lengths. As shown, the RS sequence of UE1 may start with i_start_1 (R_3 of the common RS sequence) and end with i_end_1 (R_10 of the common RS sequence). The RS sequence of the UE 2 may start with i_start_2 (R_i of the common RS sequence) and end with i_end_2 (R_M-2 of the common RS sequence). The RS sequence of the UE 3 may start with i_start_3 (R_2 of the common RS sequence) and end with i_end_3 (R_i + 2 of the common RS sequence). In other words, the RS sequence for each UE will correspond to their own assigned frequency band. Here, the start index of the RS sequence of the UE is also referred to as the index of the RS sequence of the UE.

Returning to FIG. 4, in step S402, the common reference signal sequence and the sequence configuration information are transmitted to the terminal device, and the sequence configuration information indicates a parameter capable of acquiring the initial reference signal sequence transmitted to the terminal device. ..

A common RS sequence can be transmitted to at least several terminals, each terminal receiving an RS sequence for itself in their own allocated band. However, the terminal device also needs to know the initial modulation symbol of the RS sequence (ie, the initial RS sequence not going through the channel) in order to perform, for example, channel measurement or simultaneous scheduling. As a result, sequence configuration information indicating a parameter capable of acquiring the initial reference signal sequence transmitted to the terminal device can also be transmitted to the terminal device. The parameters carried within the sequence configuration information allow the terminal device to obtain the RS sequence from a common RS sequence generated in a manner similar to that described in step 401.

In one embodiment of the present disclosure, sequence configuration information may be transmitted to the terminal device in an explicit manner. For example, the sequence configuration information may include sequence position information indicating a position where a reference signal sequence for a terminal device is located in a common reference signal sequence. The sequence position information may include any of the following:
1) The start and end indexes of the reference signal sequence for the terminal device, i.e. i_start_ue, and i_end_ue.
2) The starting index and length of the reference signal sequence for the terminal device, i.e. i_start_ue and m_ue.
3) The end index and length of the reference signal sequence for the terminal device, i.e. i_end_ue and m_ue.

Furthermore, unlike the RS generation solution in LTE, it can be seen that the index of the RS sequence for the terminal device does not correspond to the index of the frequency band. In such a case, it is also possible to transmit the offset value with respect to the frequency configuration of the terminal device to the terminal device. The offset value indicates the offset of the index of the RS sequence with respect to the terminal device with respect to the index of the frequency band assigned to the terminal device. In another embodiment of the present disclosure, it is also possible to transmit an offset value for a fixed frequency position. In this way, the terminal device can also know how to acquire the RS sequence.

In another embodiment of the present disclosure, it may also transmit the length M of the common RS sequence to the UE.

In another embodiment of the present disclosure, it is also possible to implicitly transmit sequence configuration information. In other words, the sequence configuration information can be implicitly shown from other parameters. Examples of these parameters include, but are not limited to, the boundary / length of the frequency band assigned to the terminal device, the frequency band configuration of the terminal device, and the initial value of sequence generation of the terminal device.

As mentioned above, the RS sequence for the terminal device corresponds to its own allocated bandwidth, so the boundary / length of the frequency band allocated to the terminal device implicitly provides sequence configuration information. Can be used to indicate. Further, when the band of the terminal device is selected from a group of predetermined bands having a predetermined indicated value, the frequency band configuration causes the terminal device to learn the frequency band assigned from the predetermined value, and thus obtains the sequence configuration information. Can be obtained. Moreover, it is also possible to send the sequence initialization value C_init_ue, which allows the terminal device to generate an RS sequence from itself, to the terminal device. Although C_init_ue is unique to the terminal device, it is derived from C_init for a common RS sequence, thus making the symbols of the RS sequence for different terminal devices the same at the same frequency or time position.

As mentioned above, it should be noted that the present disclosure is described using embodiments that are generated on the network side based on system bandwidth, but the present disclosure is not limited thereto. In one embodiment of the present disclosure, a common RS sequence can be generated based on a frequency band configured for a node servicing a terminal device rather than the entire system bandwidth. It should be appreciated that different serving nodes may be assigned different frequency bandwidths, in which case the network may also generate a common RS sequence corresponding to the assigned frequency bandwidth.

For example, for different frequency range configurations, the starting index for RS sequence generation can be different. However, in such cases, a common reference signal sequence can be generated based on a frequency range that covers all possible frequency ranges of different frequency range configurations. In such cases, it will ensure that RS sequences for different frequency range configurations have the same value at the same frequency position.

For example, as shown in FIG. 6, there are two different frequency range configurations, frequency range 1 and frequency range 2. In other words, the two configurations of two transmission and reception points (TRPs) / cells, or one cell, consist of different frequency band / or numerology allocations. If the UE needs to measure TRP / cell-to-cell interference, the RS sequence should be the same in a region (eg, with respect to the superposition portion). In this case, it is possible to generate a common sequence from the same start position idx_rs corresponding to the lower bounds of the two frequency ranges.

For each UE, the index idx_rs for RS generation can be shown to the UE, and the offset value k for idx_rs can also be shown to the UE. In such a case, the UE can determine the start index of the RS sequence, for example, idx_rs1 = idx_rs + k. Alternatively, it is independent of idx_rs and can indicate to the UE the start index idx_b1 for bandwidth / numerology allocation for the UE. The RS sequence with two different frequency range settings can be obtained from the common RS sequence generated from idx_rs. RS sequence parameters (eg, for serving cells and adjacent cells) may be presented to the UE. The parameter may include at least one of a start index, a length, an end index, an offset value, a numerology, and the like.

In one embodiment of the present disclosure, different frequency range configurations can have at least one of different subcarrier spacing configurations and different cyclic prefix configurations.

In embodiments of the present disclosure, fixed indexes can be used to generate RS sequences for different numerologies. The index can be detected by the UE, for example, by a sync signal. In other words, for numerology in different numerology configurations, a common reference signal sequence can be generated based on a frequency range that covers all possible frequency ranges of numerology. Further, a fixed index and an offset value with respect to the fixed index can be used to indicate the sequence configuration information.

FIG. 7 is a diagram showing the generation of an exemplary common RS sequence using a fixed index according to an embodiment of the present disclosure. As shown, for various numerology configurations, including, for example, three numerologies, for each of the numerologies 1, 2, and 3 in these numerologies, the common RS sequence generation is a fixed index, i.e., indexes 1, 2, respectively. Or 3 can be used. That is, the common RS sequence generation is generated based on a frequency range that covers all possible frequency ranges of numerology, and a fixed index and offset value are used as sequence configuration information. In this way, it is possible to keep the reference signal the same at the same frequency position.

FIG. 8 is a diagram illustrating exemplary common RS sequence generation using a fixed index according to another embodiment of the present disclosure. This solution is substantially similar to the solution of FIG. 7, except that the index is fixed at the center of each frequency range. That is, all frequency ranges have the same center frequency position.

In another embodiment of the present disclosure, the index for RS sequence generation for different numerologies can be configured by the network.

Hereinafter, the present disclosure will be described primarily with reference to dynamic bandwidth allocation, but the present disclosure is not limited thereto. The present disclosure may also be used in configurable RS patterns that may include at least one of a reference signal density configuration in the time domain, a reference signal density configuration in the frequency domain, and a reference signal frequency offset configuration. In such cases, it would be advantageous for a common reference signal sequence to be further generated based on the entire set of resource elements used for RS transmission in different reference signal configurations.

As shown in FIG. 9, RS patterns are nested in the time-frequency domain, with different RS patterns, different offsets, different densities, different transmissions when configurable RS patterns are supported in the NR system. / There may be something like the one shown on the right in FIG. 9, such as not accompanied. In such cases, as shown in the left figure of FIG. 9, it is possible to obtain the entire set of resource elements used for RS transmission in different RS configurations, thus the RE and the associated modulation symbols on the RE are You can choose from the entire set. It is then possible to generate a common RS sequence based further on the entire set of resource elements used for RS transmission with different reference signal configurations. Therefore, the RS sequence for the RS pattern of the terminal device can be obtained from the common RS sequence.

Using a common RS sequence generated based on the entire set of resource elements used for RS transmission in different reference signal pattern configurations, for UEs with different RS patterns such as different densities, their respective RSs. The sequence gets a common RS sequence.

、またはＲ＿ｉ、ｉ＝１、３、５…である。 FIG. 10 schematically shows a common RS sequence and RS sequence for each UE with different RS densities according to the embodiments of the present disclosure. As shown, the common RS sequence has a length M, so the sequence can be represented by R_i, i = 0, 1, ..., M-1. For UEs configured with different densities, the density configuration may be notified to the UE. For different density configurations, the UE can extract the required sequence from the common sequence R_i. For example, in the case of a UE with a density of 1, the sequence is R_i, i = 0, 1, ..., M-1, and in the case of a UE with a density of 1/2, the sequence is.

, Or R_i, i = 1, 3, 5, ....

Similarly, for different SCS configurations, the UE can also extract the required sequence from the common sequence.

ここで、ｉ＿ｓｔａｒｔはシーケンスの開始インデックス、ｉ＿ｅｎｄはシーケンスの終了インデックス、Ｋは密度のパラメータ（１／２密度構成の場合、Ｋ＝２）、または、ＳＣＳのパラメータ（Ｋ・ｋ０、ここで基準ＳＣＳはｋ０である）、ｏはオフセット構成である。これらのパラメータは、個別に設定することも、一緒に設定することもできる。基準ＳＣＳ ｋ０は、ネットワークによって構成することができる。たとえば、ネットワークによっては、基準ＳＣＳは１５ｋＨｚ、３０ｋＨｚ、６０ｋＨｚ、１２０ｋＨｚ、または２４０ｋＨｚである。 For example, for a UE with maximum density or minimum SCS k0, the sequence is R_i, i = 0, 1, ..., M-1. On the other hand, in the case of a UE with a density of 1 / K or SCS K * k0, the sequence can be expressed as follows.

Here, i_start is the start index of the sequence, i_end is the end index of the sequence, K is the density parameter (K = 2 in the case of the 1/2 density configuration), or the SCS parameter (K · k0, here the reference SCS). Is k0), and o is an offset configuration. These parameters can be set individually or together. The reference SCS k0 can be configured by a network. For example, depending on the network, the reference SCS may be 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz.

In embodiments of the present disclosure, RS sequences can be generated with the same or different initial values for different symbols / slots.

In another embodiment of the present disclosure, the RS sequence can be generated for the time-frequency domain. The reference density in one PRB in the frequency domain can be represented by d0 (eg maximum density), the reference SCS can be represented by k0 (eg minimum SCS), and the reference density in the time domain can be represented by t0 (eg maximum density). ) Can be expressed. The number of PRBs (based on SCS k0) can be represented by N, the length within a symbol over the entire bandwidth can be represented by L (eg L = N * d0), and the maximum of the sequence. The length can be represented by M (eg M = L * t0). The common sequence is R_i, i = 0, 1, ..., M-1. For UEs with different configurations, it can extract the required sequence from a common RS sequence.

In the case of UEs configured with different SCS kis, the RS sequence can be extracted for each ki / k0, as in the case shown in FIG. In the case of UEs configured with different densities di in the frequency domain, the RS sequence can be extracted from the common RS sequence for each di / d0, as in the case shown in FIG. For UEs configured with different time densities ti, the RS sequence can be extracted from the RS sequence group, as shown in FIG. For UEs configured with different patterns, the RS sequence can be extracted from the common RS sequence accordingly.

For UEs configured with different patterns in the time domain and different band allocations in the frequency domain, their respective RS sequences correspond to their band allocations and their RS patterns, as shown in FIG. Can be extracted from.

In embodiments of the present disclosure, one symbol and the RS modulation symbol in one PRB are similar, and then RS sequences of UEs with different densities in the frequency domain can be easily obtained.

In another embodiment of the present disclosure, the modulation symbols in the common reference signal sequence are varied by either a predetermined number of subcarriers in the frequency domain and a predetermined number of symbols in the time domain.

As shown in FIG. 13, the modulation symbols in the common RS sequence can be varied by a predetermined number of subcarriers in the frequency domain. That is, within these subcarriers, the modulation symbols can be the same, but different from the modulation symbols in another predetermined number of subcarriers.

Alternatively, as shown in FIG. 14, the modulated symbols in the common RS sequence can be varied by a predetermined number of symbols in the time domain. That is, the modulation symbols in a predetermined number of symbols are the same, but may be different from other predetermined numbers of symbols.

In addition, the modulation symbols in the common RS sequence can also change with time-frequency blocks, as shown in FIG. That is, within the same time-frequency block, the modulation symbols will be the same, but different from other time-frequency blocks. Time-frequency blocks may have no frequency shift between them, as shown on the left side of FIG. 15, or may have a predetermined frequency shift, as shown on the right side of FIG.

In addition, the densities of one RS within different symbols can vary as shown in FIGS. 16A (without offset) and FIG. 16B (with offset). In such cases, there may be several options. The first option allows an RS sequence to be generated for the first symbol containing RS and a modulation symbol for subsequent symbols to be generated based on the first symbol in the same frequency position. For example, it is the same as the first offset in the same frequency position, or multiplied by the frequency offset (complex number). In the second option, one common RS sequence is generated for the time-frequency block, and the modulation symbols on different symbols are extracted from the common RS sequence. The third option initializes the RS sequence for each symbol.

In the NR system, Phase Tracking RS (PT-RS) is introduced, which is used to track phase noise or frequency offset and is the reference signal agreed at the RAN1 # 87 conference. According to the agreement at the RAN1 # 87 conference, the density of PT-RS in the frequency domain can be quite marginal. In such cases, the sequence of PT-RS can be generated based on the previous DMRS at the same frequency position. That is, the PT-RS may be the same as or multiplied by the frequency offset (complex number) with the previous DMRS at the same frequency position. Alternatively, it is also possible to generate a PT-RS sequence using the set sequence index, in which case the sequence setting information can be transmitted to the terminal device.

The operation related to the new RS solution on the network side has been described above. Hereinafter, the operation related to the new RS solution on the terminal device side will be described with reference to FIG.

FIG. 17 further schematically illustrates a flow chart of a method for receiving a reference signal according to an exemplary embodiment of the present disclosure. Method 1700 can be implemented in a terminal device, such as a UE, or other similar terminal device.

As shown in FIG. 17, the method starts from step 1701 and a terminal device such as a UE obtains a reference signal sequence transmitted from the network side and a reference signal sequence transmitted to the terminal device. Receives sequence configuration information, which indicates the parameters that can be used.
In one embodiment of the present disclosure, the sequence configuration information may be, for example, explicit information that may include sequence position information indicating the position of the reference signal sequence for the terminal device within the common reference signal sequence. can. As an example, the sequence position information is the start index and end index of the reference signal sequence for the terminal device, the start index and the length of the reference signal sequence of the terminal device, and the end index of the terminal device related to the offset value with respect to the frequency configuration of the terminal device. And can include either the length of the reference signal sequence and the offset value for a fixed frequency position.

In another embodiment of the present disclosure, the sequence configuration information is, for example, one of the boundary / length of the frequency band assigned to the terminal device, the frequency band configuration of the terminal device, and the initial sequence generation value of the terminal device. It can be implicit information indicated by other parameters it contains.

Next, in step 1702, the initial reference signal sequence for the terminal device can be acquired based on the sequence configuration information. In the terminal device, the terminal device can generate a common RS sequence in the same manner as described with reference to FIGS. 4 to 16. Therefore, the terminal device can extract the initial RS sequence based on the sequence configuration information received in step 1702. Therefore, the terminal device can know the initial RS sequence that does not go through the channel between the serving node such as node B and the terminal device such as UE. In step 702, it is possible to perform, for example, channel estimation or simultaneous scheduling by means of the initial RS sequence and the RS sequence in which the terminal device is in its allocated frequency band.
In one embodiment of the present disclosure, acquiring the initial reference signal sequence of the terminal device may include acquiring the initial reference signal sequence of the terminal device based on the sequence configuration information and the reference signal pattern of the terminal device. The reference signal pattern may include at least one of a reference signal density configuration in the time domain, a reference signal density configuration in the frequency domain, and a reference signal frequency offset configuration.

Accordingly, embodiments of the present disclosure propose less complex reference signal sequence solutions for wireless communication systems (particularly newer wireless access systems) with dynamic bandwidth allocation and / or configurable reference signal patterns. Regardless of the reference signal transmission configuration, such as bandwidth allocation and / or reference signal pattern configuration, one common reference signal sequence can be generated and shared by at least several terminal devices. Thus, it is possible to perform RS measurements and multi-user scheduling for the UE even if they are configured with different bandwidth allocations and / or configurable reference signal patterns. In addition, it is possible to achieve better interference elimination because the reference signal from the interference cell is more likely to be obtained. In addition, the terminal device only needs to generate a small number (eg, only one) of common reference signal sequences for different bandwidth allocations and / or RS pattern configurations, which is a less complex solution. Means a measure.

Further, the present disclosure also provides a device for transmitting and receiving a reference signal in a serving node and a terminal device in a wireless communication system, which will be described below with reference to FIGS. 18 and 19.

FIG. 18 schematically shows a block diagram of a device 1800 for transmitting a reference signal in a wireless communication system according to an embodiment of the present disclosure. The device 1800 can be implemented in a serving node, eg, a BS such as node B (NodeB or NB).

As shown in FIG. 18, the apparatus 1800 may include a reference signal generation module 1801 and a sequence and information transmission module 1802. The reference signal generation module 1801 is configured to generate a common reference signal sequence shared by at least several terminal devices to which their own reference signal transmission configurations are assigned, based on the frequency range configuration on the network side. obtain. The sequence and information transmission module 1802 is configured to transmit a common reference signal sequence and sequence configuration information to a terminal device, the sequence configuration information for acquiring an initial reference signal sequence transmitted to the terminal device. Indicates a parameter.

In one embodiment of the present disclosure, the sequence configuration information may include sequence position information indicating the position of the reference signal sequence for the terminal device in the common reference signal sequence.

In another embodiment of the present disclosure, the sequence position information is of the start index and end index of the reference signal sequence for the terminal device, the start index and the length of the reference signal sequence of the terminal device, the end index and the reference signal sequence of the terminal device. It may include the length and either an offset value for the frequency configuration of the terminal device or an offset value for a fixed frequency position.

In a further embodiment of the present disclosure, the sequence configuration information is indicated by either the boundary / length of the frequency band assigned to the terminal device, the frequency band configuration of the terminal device, or the initial sequence generation value of the terminal device. obtain.

In still further embodiments of the present disclosure, the frequency range configuration on the network side may include either the system bandwidth and the frequency band set on the node servicing the terminal device.

In still further embodiments of the present disclosure, the reference signal transmission configuration comprises at least one of a band allocation, a reference signal density configuration in the time domain, a reference signal density configuration in the frequency domain, and a reference signal frequency offset configuration. ..

In another embodiment of the present disclosure, the reference signal generation module 1801 generates a common reference signal sequence for different frequency range configurations based on a frequency range that covers all possible frequency ranges of the different frequency range configurations. Can be further configured to. Different frequency range configurations may have at least one of different subcarrier spacing configurations and different cyclic prefix configurations.

In a further embodiment of the present disclosure, the reference signal generation module 1801 may be further configured to generate a common reference signal sequence based further on the entire set of resource elements used for RS transmission in different reference signal configurations.

In still further embodiments of the present disclosure, the modulation symbols in the common reference signal sequence are varied by either a time-frequency block, a predetermined number of subcarriers in the frequency domain, and a predetermined number of symbols in the time domain. obtain.

In yet further embodiments of the present disclosure, the modulation symbols in the reference signal sequence within the symbol may be generated based on the modulation symbols in the reference signal sequence within the previous symbol at the same frequency position.

In another embodiment of the present disclosure, a reference signal sequence within a symbol can have at least one of a different density and a different frequency offset than the reference signal sequence within a previous symbol.

FIG. 19 further schematically shows a block diagram of a device 1900 for receiving a reference signal in a wireless communication system according to an embodiment of the present disclosure. The device 1900 can be mounted on a terminal device, such as a UE, or other similar terminal device.

As shown in FIG. 19, the apparatus 1900 may include a sequence and signal receiving module 1901 and a sequence acquisition module 1902. The signal receiving module 1901 is configured to receive a reference signal sequence transmitted from the network side and sequence configuration information indicating parameters capable of acquiring the reference signal sequence transmitted to the terminal device. Can be done. The sequence acquisition module 1902 can be configured to acquire an initial reference signal sequence for the terminal device based on the sequence configuration information.

In one embodiment of the present disclosure, the sequence acquisition module 1902 can be further configured to acquire the initial reference signal sequence of the terminal device based on the sequence configuration information of the terminal device and the reference signal pattern.

The devices 1800 and 1900 have been described above with reference to FIGS. 18 and 19. It should be noted that the devices 1800 and 1900 may be configured to perform functions as described with reference to FIGS. 4-17. Therefore, for details on the operation of the modules in these devices, reference can be made to those explanations made for each step of the method with reference to FIGS. 4-17.

Further note that the components of the devices 1800 and 1900 can be embodied in hardware, software, firmware, and / or any combination thereof. For example, the components of devices 1800 and 1900 may be implemented by circuits, processors, or any other suitable selection device, respectively.

Those skilled in the art will appreciate that the embodiments described above are for illustration purposes only and that the present disclosure is not limited thereto. Many modifications, additions, deletions, and modifications can be easily conceived from the teachings provided herein, all of which are included in the scope of protection of this disclosure.

Further, in some embodiments of the present disclosure, each of the devices 1800 and 1900 may include at least one processor. At least one processor suitable for use with embodiments of the present disclosure may include, for example, both general purpose and special purpose processors already known or developed in the future. Each of the devices 1800 and 1900 may further include at least one memory. The at least one memory can include, for example, a semiconductor memory device such as a RAM, ROM, EPROM, EEPROM, and a flash memory device. At least one memory can be used to store a program of computer executable instructions. Programs can be written in any high-level and / or low-level compatible or interpretable programming language. According to embodiments, the computer executable instructions may be configured to use at least one processor to cause the devices 1800 and 1900 to perform operations according to the methods described with reference to at least each of FIGS. 4-17.

FIG. 20 is embodied as a device 2010 that can be embodied or included as a serving node such as a base station in a wireless network and a terminal device such as the UE described herein. Further shown is a simplified block diagram of device 2020 that can be included in or included in it.

The apparatus 2010 includes at least one processor 2011 such as a data processor (DP) and at least one memory (MEM: MEMory) 2012 coupled to the processor 2011. The device 2010 further includes a transmitter TX and a receiver RX 2013 coupled to the processor 2011, which can operate to communically connect to the device 2020. The MEM 2012 stores a program (PROG: PROGram) 2014. PROG 2014 may include instructions that, when run on the associated processor 2011, allow the device 2010 to operate according to embodiments of the present disclosure, such as method 400. The combination of at least one processor 2011 and at least one MEM 2012 can form processing means 2015 that are adapted to implement the various embodiments of the present disclosure.

The device 2020 comprises at least one processor 2021 such as a DP and at least one MEM 2022 coupled to the processor 2021. The device 2020 may further include a suitable TX / RX2023 coupled to a processor 2021 that may be operational for wireless communication with the device 2010. MEM2022 stores PROG2024. PROG2024 can include instructions that allow device 2020 to operate according to embodiments of the present disclosure, eg, method 1700, when run on the associated processor 2021. A combination of at least one processor 2021 and at least one MEM 2022 can form processing means 2025 that is adapted to implement the various embodiments of the present disclosure.

Various embodiments of the present disclosure may be implemented by computer programs, software, firmware, hardware, or a combination thereof that can be executed by one or more of the processors 2011, 2021.

MEM2012 and 2022 may be of any type suitable for the local technical environment, including semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable as a non-limiting example. It can be implemented using any suitable data storage technique such as memory.

Processors 2011 and 2021 may be of any type suitable for the local technical environment, and may include one or more of general purpose computers, dedicated computers, microprocessors, digital signal processor DSPs and processors based on the multi-core processor architecture. It may be included as a non-limiting example.

Further, the present disclosure can also provide a carrier comprising a computer program as described above, wherein the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium. The computer-readable storage medium is, for example, an optical compact disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), a flash memory, a magnetic tape, a CD-ROM, a DVD, a Blu-ray disk, or the like. Can be an electronic memory device such as.

The techniques described herein can be performed by a variety of means, such that the device performing one or more functions of the corresponding device described in one embodiment is not limited to the means of the prior art. However, it is also a means for performing one or more functions of the corresponding apparatus described in the embodiments, for each separate function to perform a separate means, or two or more functions. May include means that may be configured in. For example, these techniques may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or a combination thereof. In the case of firmware or software, it can be implemented via modules (eg, procedures, functions, etc.) that perform the functions described herein.

Exemplary embodiments herein have been described above with reference to block diagrams and flowcharts of methods and devices. It will be appreciated that each block in the block diagram and flowchart, as well as the combination of blocks in the block diagram and flowchart diagram, can be implemented by a variety of means, including computer program instructions. These computer program instructions are in the flowchart block to manufacture the machine so that the instructions executed on the computer or other programmable data processing device create the means for performing the specified function. Can be loaded into a general purpose computer, a dedicated computer or other programmable data processing device.

This specification contains many specific implementation details, but these are not limitations to any scope of implementation or what can be claimed, but rather a description of features that may be specific to a particular embodiment of a particular implementation. Should be interpreted as. The particular features described herein in the context of separate embodiments can also be combined and implemented in a single embodiment. Conversely, the various features described in the context of a single embodiment can also be implemented separately or in any suitable subcombination in multiple embodiments. Further, the features are described above as acting in a particular combination, and may be initially claimed as such, but one or more features from the claimed combination can be clipped from the combination. The claimed combination may then be directed to a sub-combination or a variant of the sub-combination.

It will be apparent to those skilled in the art that the concepts of the invention can be practiced in various ways as technology advances. The embodiments described above are provided for illustration, but not limitation, of the present disclosure and rely on modifications and variations without departing from the spirit and scope of the present disclosure, as will be readily appreciated by those of skill in the art. Can be done. Such modifications and variations are considered to be within the scope of the claims of the present disclosure and attachment. The scope of protection of this disclosure is defined by the appended claims.

Claims (20)

Generates a first sequence for a Channel State Information Reference Signal (CSI-RS).
The first sequence is mapped to the resource for the CSI-RS and
The resource is set within the bandwidth specific to the user equipment (UE).
The UE-specific bandwidth is part of the cell-specific bandwidth in the cell.
The first sequence has a plurality of elements, and each element in the plurality of elements has its own index.
Each of the indexes is associated with a separate index indicating a plurality of second positions within the resource.
Separate indexes indicating the second position are defined relative to the cell-specific position in the frequency domain.
The cell-specific position is common to each UE in the cell.
The CSI-RS is received at the plurality of second positions.
UE method. Receives information corresponding to the starting position and width of the UE-specific bandwidth in the frequency domain.
The method according to claim 1. The UE-specific bandwidth may overlap with UE-specific bandwidth configured for other UEs in the frequency domain.
The method according to claim 1 or 2. The UE can be scheduled within the bandwidth specific to the UE.
The method according to any one of claims 1 to 3. A plurality of UEs are located in the cell, and each of the plurality of UEs in the cell has a different UE-specific bandwidth.
The method according to any one of claims 1 to 4. Generates a first sequence for a Channel State Information Reference Signal (CSI-RS).
The first sequence is mapped to the resource for the CSI-RS and
The resource is set within the bandwidth specific to the user equipment (UE).
The UE-specific bandwidth is part of the cell-specific bandwidth in the cell.
The first sequence has a plurality of elements, and each element in the plurality of elements has its own index.
Each of the indexes is associated with a separate index indicating a plurality of second positions within the resource.
Separate indexes indicating the second position are defined relative to the cell-specific position in the frequency domain.
The cell-specific position is common to each UE in the cell.
The CSI-RS is transmitted at the plurality of second positions.
Base station method. Sends information corresponding to the starting position and width of the UE-specific bandwidth in the frequency domain.
The method according to claim 6. The UE-specific bandwidth may overlap with UE-specific bandwidth configured for other UEs in the frequency domain.
The method according to claim 6 or 7. The base station can perform scheduling within the UE-specific bandwidth.
The method according to any one of claims 6 to 8. A plurality of UEs are located in the cell, and each of the plurality of UEs in the cell has a different UE-specific bandwidth.
The method according to any one of claims 6 to 9. It comprises a controller configured to generate a first sequence for a Channel State Information Reference Signal (CSI-RS).
The first sequence is mapped to the resource for the CSI-RS and
The resource is set within the bandwidth specific to the user equipment (UE).
The UE-specific bandwidth is part of the cell-specific bandwidth in the cell.
The first sequence has a plurality of elements, and each element in the plurality of elements has its own index.
Each of the indexes is associated with a separate index that indicates a plurality of second positions within the resource.
Separate indexes indicating the second position are defined relative to the cell-specific position in the frequency domain.
The cell-specific position is common to each UE in the cell.
A transceiver configured to receive the CSI-RS at the plurality of second positions.
UE. The transceiver is configured to receive information corresponding to the starting position and width of the UE-specific bandwidth in the frequency domain.
The UE according to claim 11. The UE-specific bandwidth may overlap with UE-specific bandwidth configured for other UEs in the frequency domain.
The UE according to claim 11 or 12. The UE can be scheduled within the bandwidth specific to the UE.
The UE according to any one of claims 11 to 13. A plurality of UEs are located in the cell, and each of the plurality of UEs in the cell has a different UE-specific bandwidth.
The UE according to any one of claims 11 to 14. It comprises a controller configured to generate a first sequence for a Channel State Information Reference Signal (CSI-RS).
The first sequence is mapped to the resource for the CSI-RS and
The resource is set within the bandwidth specific to the user equipment (UE).
The UE-specific bandwidth is part of the cell-specific bandwidth in the cell.
The first sequence has a plurality of elements, and each element in the plurality of elements has its own index.
Each of the indexes is associated with a separate index indicating a plurality of second positions within the resource.
Separate indexes indicating the second position are defined relative to the cell-specific position in the frequency domain.
The cell-specific position is common to each UE in the cell.
A transceiver configured to transmit the CSI-RS at the plurality of second positions.
base station. The transceiver is configured to transmit information corresponding to the starting position and width of the UE-specific bandwidth in the frequency domain.
The base station according to claim 16. The UE-specific bandwidth may overlap with UE-specific bandwidth configured for other UEs in the frequency domain.
The base station according to claim 16 or 17. The UE can be scheduled within the bandwidth specific to the UE.
The base station according to any one of claims 16 to 18. A plurality of UEs are located in the cell, and each of the plurality of UEs in the cell has a different UE-specific bandwidth.
The base station according to any one of claims 16 to 19.

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