WO2018226054A1 - Resource allocation-related signaling method in wireless communication system and device using same - Google Patents

Abstract

Provided are a signaling method of a device in a wireless communication system and a device using same. The method comprises: transmitting, to a terminal via an upper layer signal, first information informing about a first resource unit used for interleaving; and performing interleaving for a particular resource for the terminal by the first resource unit, wherein the information informing about the first resource unit is signaled to the terminal separately from second information for informing about a second resource unit used when a base station allocates resources for the terminal.

Description

Resource allocation related signaling method and apparatus using the method in wireless communication system

The present invention relates to wireless communication, and more particularly, to a signaling method related to resource allocation in a wireless communication system and an apparatus using the method.

As more communication devices demand greater communication capacity, there is a need for improved mobile broadband communication as compared to conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication.

Communication systems that consider services or terminals that are sensitive to reliability and latency are also being discussed. Next-generation wireless access technologies that take into account improved mobile broadband communications, massive MTC, and ultra-reliable and low latency communications (URLLC) It may be referred to as new radio access technology (RAT) or new radio (NR).

In future wireless communication systems, a bandwidth part may be introduced. The band portion may be used to allocate some bands for the terminal that is difficult to support the broadband in a wireless communication system using a wide band. Resources allocated to the UE in this band portion may be performed in a resource block group (RBG) unit. At this time, it may be a problem how to determine the size of the RBG.

In addition, the base station may use interleaving in allocating resources to the terminal. Interleaving may be mapping a virtual resource block that is a logical resource block to a physical resource block. It is necessary to define how the unit of interleaving and the unit of resource allocated to the terminal are related, how should they be signaled, and the like.

In view of the foregoing problems / needs, the present invention proposes a method and apparatus for allocating resources in a wireless communication system.

The present invention has been made in an effort to provide a signaling method and an apparatus using the resource allocation related signaling in a wireless communication system.

In one aspect, a method for signaling resource allocation related to a base station in a wireless communication system is provided. The method transmits first information indicating a first resource unit used for interleaving to the terminal through an upper layer signal, and performs interleaving on a specific resource for the terminal in the first resource unit. The first information may be instructed to the terminal separately from the second information indicating a second resource unit used by the base station in resource allocation to the terminal.

The interleaving may be to map a virtual resource block to a physical resource block.

The first resource unit may be different from the second resource unit.

The higher layer signal may be a radio resource control (RRC) signal.

The second resource unit may be determined based on the number of resource blocks constituting the band and the second information.

In another aspect, an apparatus provided includes a transceiver that transmits and receives a wireless signal and a processor that operates in conjunction with the transceiver, the processor using a first layer for interleaving via a higher layer signal. Transmitting first information indicating a resource unit to a terminal, and performing interleaving on a specific resource for the terminal in the first resource unit, wherein the first information is allocated by the device to the terminal; It is characterized in that the terminal is indicated separately from the second information indicating the second resource unit to be used during allocation.

In another aspect, a method of determining a size of a resource block group in a wireless communication system includes: number of resource block groups (RBGs) for a downlink band including a plurality of (N ^DL _RB ) resource blocks (N) _RBG ) and determine the size of each of the number N _RBG resource block groups, wherein one resource block group in which the plurality of N ^DL _RB resource blocks are configured for the downlink band If it is not a multiple of P, the size of each of the remaining resource block groups except for one of the number N _RBG resource block groups is the size P of the resource block group configured for the downlink band. The size of the excluded one resource block group may be resource blocks excluding the remaining resource block groups from the plurality of N ^DL _RB resource blocks.

The resource block group may be composed of a plurality of resource blocks.

The size P of the resource block group may indicate how many resource blocks the resource block group is composed of.

In another aspect, a method of operating a terminal in a wireless communication system includes receiving first information indicating a first resource unit to be used for interleaving through an upper layer signal from a base station, and receiving the first information as the first resource unit. Receive an interleaved specific resource from the base station, wherein the first information is indicated separately from the second information indicating a second resource unit used by the base station in resource allocation for the terminal. It is done.

In another aspect, a terminal provided includes a transceiver for transmitting and receiving a radio signal and a processor operating in combination with the transceiver, wherein the processor is configured to use for interleaving through a higher layer signal. Receiving first information indicating a resource unit from the base station, and receives a specific resource interleaved in the first resource unit from the base station, wherein the first information, the base station resource allocation for the terminal (resource allocation) The second information indicating the second resource unit used at the time of) is separately indicated.

In a next generation wireless communication system, a method of determining a size of a resource allocation unit (for example, RBG) may be defined so that there is no ambiguity between a base station and a terminal and resource allocation can be efficiently performed. In addition, multiplexing may be facilitated when allocating resources to different terminals.

1 illustrates an existing wireless communication system.

FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.

3 is a block diagram illustrating a radio protocol structure for a control plane.

4 illustrates a system structure of a new generation radio access network (NG-RAN) to which NR is applied.

5 illustrates a frame structure that can be applied in the NR.

6 illustrates CORESET.

7 is a diagram showing the difference between the conventional control area and the CORESET in the NR.

8 illustrates a carrier bandwidth part newly introduced in NR.

9 illustrates a method for determining a resource block group (RBG) size according to an embodiment of the present invention.

10 is a specific example of determining a resource block group size according to FIG. 9.

11 shows an example for resource allocation type 1. FIG.

12 shows an example for hopping region setting.

13 illustrates a signaling method of an apparatus in a wireless communication system according to the present invention.

14 is a block diagram illustrating an apparatus in which an embodiment of the present invention is implemented.

1 illustrates an existing wireless communication system. This may also be called an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), or Long Term Evolution (LTE) / LTE-A system.

The E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE). The terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like. . The base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.

The base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.

EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway). The MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal. S-GW is a gateway having an E-UTRAN as an endpoint, and P-GW is a gateway having a PDN as an endpoint.

Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. L2 (second layer), L3 (third layer) can be divided into the physical layer belonging to the first layer of the information transfer service (Information Transfer Service) using a physical channel (Physical Channel) is provided, The RRC (Radio Resource Control) layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.

FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane. 3 is a block diagram illustrating a radio protocol structure for a control plane. The user plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

2 and 3, a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel. The physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.

Data moves between physical layers between physical layers, that is, between physical layers of a transmitter and a receiver. The physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

The functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels. The MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.

Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs. In order to guarantee the various Quality of Service (QoS) required by the radio bearer (RB), the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode). Three modes of operation (AM). AM RLC provides error correction through an automatic repeat request (ARQ).

The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers. RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.

Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering. The functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transfer of control plane data and encryption / integrity protection.

The establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method. RB can be further divided into SRB (Signaling RB) and DRB (Data RB). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.

The downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic (MTCH). Channel).

The physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain. One sub-frame consists of a plurality of OFDM symbols in the time domain. The RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers. In addition, each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel. Transmission Time Interval (TTI) is a unit time of subframe transmission.

Hereinafter, new radio access technology (new RAT) or new radio (NR) will be described.

As more communication devices demand larger communication capacities, there is a need for improved mobile broadband communication as compared to conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering services / terminals that are sensitive to reliability and latency has been discussed. The introduction of next-generation wireless access technologies in consideration of such extended mobile broadband communication, massive MTC, Ultra-Reliable and Low Latency Communication (URLLC), and the like are discussed in the present invention for convenience. Is called new RAT or NR.

4 illustrates a system structure of a new generation radio access network (NG-RAN) to which NR is applied.

Referring to FIG. 4, the NG-RAN may include a gNB and / or eNB that provides a user plane and control plane protocol termination to the terminal. 4 illustrates a case of including only gNB. gNB and eNB are connected to each other by Xn interface. The gNB and eNB are connected to a 5G Core Network (5GC) through an NG interface. More specifically, the access and mobility management function (AMF) is connected through the NG-C interface, and the user plane function (UPF) is connected through the NG-U interface.

gNB is inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control (Radio Admission Control), radio admission control (Radio Admission Control), measurement configuration and provision (Measurement configuration & Provision) , Dynamic resource allocation, and the like. AMF can provide functions such as NAS security, idle state mobility handling, and the like. The UPF may provide functions such as mobility anchoring and PDU processing.

5 illustrates a frame structure that can be applied in the NR.

Referring to FIG. 5, a frame may include 10 ms (milliseconds) and include 10 subframes including 1 ms.

One or more slots may be included in the subframe according to subcarrier spacing.

The following table exemplifies a subcarrier spacing configuration μ.

TABLE 1

The following table shows the number of slots in a ^frame (N ^{frame, μ} _slot ), the number of slots in a ^subframe (N ^{subframe, μ} _slot ), the number of symbols in a ^slot (N ^slot _symb ), etc., according to the subcarrier spacing configuration μ. To illustrate.

TABLE 2

In FIG. 5, (mu) = 0, 1, 2 are illustrated.

A plurality of orthogonal frequency division multiplexing (OFDM) symbols may be included in the slot. The plurality of OFDM symbols in the slot may be divided into downlink (denoted as D, downlink), flexible (denoted as X, and uplink, denoted as U). The format of the slot may be determined according to which of the D, X, and U OFDM symbols in the slot.

The following table shows an example of a slot format.

TABLE 3

The terminal may receive the format of the slot through the higher layer signal, the format of the slot through the DCI, or the format of the slot based on the combination of the higher layer signal and the DCI.

The physical downlink control channel (PDCCH) may be composed of one or more control channel elements (CCEs) as shown in the following table.

TABLE 4

That is, the PDCCH may be transmitted through a resource composed of 1, 2, 4, 8, or 16 CCEs. Here, the CCE is composed of six resource element groups (REGs), and one REG is composed of one resource block in the frequency domain and one orthogonal frequency division multiplexing (OFDM) symbol in the time domain.

Meanwhile, in a future wireless communication system, a new unit called control resource set (CORESET) may be introduced. The terminal may receive the PDCCH in the CORESET.

6 illustrates CORESET.

Referring to FIG. 6, the CORESET may be configured of N ^CORESET _RB resource blocks in the frequency domain and may be configured by N ^CORESET _symb ∈ {1, 2, 3} symbols in the time domain. N ^CORESET _RB , N ^CORESET _symb may be provided by a base station through a higher layer signal. As shown in FIG. 6, a plurality of CCEs (or REGs) may be included in the CORESET.

The UE may attempt PDCCH detection in units of 1, 2, 4, 8, or 16 CCEs in CORESET. One or a plurality of CCEs capable of attempting PDCCH detection may be referred to as PDCCH candidates.

The terminal may receive a plurality of resets.

7 is a diagram showing the difference between the conventional control area and the CORESET in the NR.

Referring to FIG. 7, the control region 300 in the conventional wireless communication system (eg, LTE / LTE-A) is configured over the entire system band used by the base station. Except for some terminals (eg, eMTC / NB-IoT terminals) that support only a narrow band, all terminals may receive radio signals of the entire system band of the base station in order to properly receive / decode control information transmitted by the base station. I should have been able.

On the other hand, in the future wireless communication system, the aforementioned CORESET has been introduced. The CORESETs 301, 302, and 303 may be referred to as radio resources for control information that the terminal should receive, and may use only a part of the system band instead of the entire system band. The base station may allocate CORESET to each terminal and transmit control information through the assigned CORESET. For example, in FIG. 6, the first CORESET 301 may be allocated to the terminal 1, the second CORESET 302 may be allocated to the second terminal, and the third CORESET 303 may be allocated to the terminal 3. The terminal in the NR may receive control information of the base station even though the terminal does not necessarily receive the entire system band.

In the CORESET, there may be a terminal specific CORESET for transmitting terminal specific control information and a common CORESET for transmitting control information common to all terminals.

8 illustrates a carrier bandwidth part newly introduced in NR.

Referring to FIG. 8, the carrier band portion may be simply abbreviated as a bandwidth part (BWP). As described above, in the future wireless communication system, various numerology (eg, various subcarrier spacings) may be supported for the same carrier. NR may define a common resource block (CRB) for a given numerology on a given carrier.

The band portion BWP may be a set of contiguous physical resource blocks (PRBs) selected from contiguous subsets of common resource blocks (CRBs) for a given numerology on a given carrier.

As shown in FIG. 8, a common resource block may be determined according to numerology for which carrier band, for example, what subcarrier spacing is used. The common resource block may be indexed from the lowest frequency of the carrier band (starting from 0), and a resource grid based on the common resource block (resource grid, which may be referred to as a common resource block resource grid) may be defined. .

The band portion may be indicated based on the CRB having the lowest index (referred to as CRB 0). The CRB 0 having the lowest index is also referred to as point A.

For example, under a given numerology of a given carrier, the band i portion may be indicated by N ^start _{BWP, i} and N ^size _{BWP, i} . N ^start _{BWP, i} may indicate the start CRB of the iW BWP on the basis of CRB 0, and N ^size _{BWP, i} may indicate the size in the frequency domain of the BWP i. . PRBs in each BWP may be indexed from zero. The index of the CRB in each BWP may be mapped to the index of the PRB. For example, it may be mapped as n _CRB = n _PRB + N ^start _{BWP, i} .

The UE may receive up to four downlink band portions in downlink, but only one downlink band portion may be activated at a given time. The UE does not expect to receive PDSCH, PDCCH, CSI-RS, etc. out of the downlink band portion activated among the downlink band portions. Each downlink band portion may include at least one CORESET.

The UE may receive up to four uplink band portions in uplink, but only one uplink band portion may be activated at a given time. The UE does not transmit the PUSCH, the PUCCH, etc. except for the uplink band portion activated among the uplink band portions.

The NR operates on a wideband as compared to conventional systems, where not all terminals can support this wideband. The band portion (BWP) may be a feature that enables a terminal that cannot support the broadband to operate.

The resource allocation type will now be described. The resource allocation type specifies how the scheduler (eg, base station) allocates resource blocks for each transmission. For example, when a base station allocates a band composed of a plurality of resource blocks to a terminal, the base station may inform the resource blocks allocated to the terminal through a bitmap composed of bits corresponding to each resource block of the band. . In this case, the flexibility of resource allocation will be the greatest, but the amount of information used for resource allocation will be increased.

In consideration of these advantages and disadvantages, the following three resource allocation types can be defined / used.

1) Resource allocation type 0 allocates a resource through a bitmap, where each bit of the bitmap indicates a resource block group (RBG) rather than a resource block. That is, in resource allocation type 0, resource allocation is performed on a resource block group basis, not on a resource block level. The following table illustrates the size of the RBG used when the system band consists of N ^DL _RB resource blocks.

TABLE 5

2) Resource allocation type 1 is a method of allocating resources in RBG subset units. One RBG subset may consist of a plurality of RBGs. For example, RBG subset # 0 is RBG # 0, 3, 6, 9 ..., RBG subset # 1 is RBG # 1,4,7,10, ..., RBG subset # 2 is RBG # 2, 5, 8, 11 ... and the like. The number of RBGs included in one RBG subset and the number of resource blocks (RBs) included in one RBG are set equal. Resource allocation type 1 indicates which of the RBG subsets is used and which RBs are used within the used RBG subset.

3) Resource allocation type 2 is a method of allocating resources in such a manner as to indicate a band starting position (RB number) to be allocated and the number of consecutive resource blocks. The consecutive resource blocks may be started from the start position. However, the contiguous resource blocks are not necessarily limited to physical contiguity, but may also mean that logical or virtual resource block indexes are contiguous.

In future wireless communication systems, the number of resource blocks constituting the RBG (or group of RBs) may be changed flexibly. In this case, information on the corresponding RBG, for example, information indicating the number of resource blocks constituting the RBG, may be transmitted through a higher layer signal such as a scheduling DCI or a third physical layer (L1) signaling or an RRC message. .

In addition, in a future wireless communication system, resource allocation information (eg, information on the above-described RBG) may include information on a time-domain in addition to information on a frequency domain. The inclusion of information, how it is included, etc. can also be changed flexibly.

The present invention proposes a resource allocation method for a PDSCH and / or a PUSCH when there are various field sizes and / or interpretation methods for resource allocation. In the following embodiments, for convenience of explanation, the RBG-based bitmap scheme is assumed when the RBG size is flexible. However, when resource allocation granularity is changed and / or accordingly, It can be extended even if it is changed.

In an embodiment of the present invention, the resource allocation scheme (particularly, the content of the RBG size or grid) may be applied to at least a PDSCH or PUSCH mapable resource region. Different resource allocation schemes (RBG size or grid) may be applied in other resource zones. For example, when a specific resource of the PDCCH region can be used for PDSCH mapping, the RBG size and other RBG sizes in the region may be independently set or indicated.

As another example, when resource allocation of a PDSCH or a PUSCH is performed for a plurality of carriers or band parts, the RBG size may be differently or independently set / indicated for each carrier or band part.

In the embodiment of the present invention, it is assumed that the situation in which the RBG size is changed flexibly (or indicated by DCI), but the situation in which the number of RBGs that may be indicated by the resource allocation (RA) field is changed flexibly (or indicated by DCI). It can also be extended to apply.

Dynamic field size for time and / or frequency resource allocation

In the following embodiments, RBG may be viewed as a value representing frequency-domain granularity. The RBG size may be one that changes fluidly. Therefore, when the RBG is used, the resource allocation field size in the frequency domain may also be changed flexibly.

Large RBG size may be advantageous in indicating a large area (for example, the entire terminal band or the system band) on the frequency axis. On the other hand, a small RBG size may be advantageous in indicating a small region (for example, one or several physical resource blocks) on the frequency axis.

In order to maintain scheduling flexibility on the frequency axis as much as possible, if the RBG size is small (compared to the large RBG size), the required resource allocation field size may be excessively large.

For example, when the RBG size is set to 10 in a band (BW) consisting of 50 physical resource blocks (PRB), the bitmap frequency axis resource allocation field may consist of 5 bits, whereas the RBG size is 2 The frequency axis resource allocation field may consist of 25 bits.

The resource allocation field is included in the DCI, and it may be advantageous in terms of blind decoding / detection from the UE's point of view to keep the total DCI size or the total resource allocation field size the same.

The bits of the resource allocation field that vary according to the RBG size selection may be mainly used to perform time domain resource allocation. The allocation method for time and / or frequency domain resources may differ according to the indicated RBG size.

The following shows an example of a resource allocation method according to the RBG size. All or some combination of the following schemes may be used in allocating time and frequency resources.

1) When the RBG size is small below or below a certain level (N _low ), what the resource allocation field indicates may be limited to resources in the frequency domain. The specific level may be a preset default RBG size or may be set in a higher layer.

When the RBG size is smaller than or below a certain level, resource allocation in the time domain is predetermined (to the time axis) for the PDSCH mapping region or the PUSCH mapping region determined through a higher layer signal or determined by a slot type format or the like. Can be performed for. Alternatively, a time domain resource targeted for resource allocation may be separately indicated by higher layer signaling or information on a slot type format.

If a default time domain resource is used: Here, the default time domain resource is predetermined (e.g. PDSCH or PUSCH across slots), or if slot type related information is dynamically indicated, the time domain information is The slot type related information may be dynamically changed in the slot. Alternatively, even when slot type related information is transmitted, a start point and a duration of a PDSCH or a PUSCH may be preset by an upper layer signal for reliability. Alternatively, even when slot type related information is not transmitted, higher layer signaling may be considered.

2) If the RBG size is above or above a certain level (N _high ), what the resource allocation field indicates may be limited to resources in the time domain. More specifically, the RBG size may be the same as or equal to the system band or the terminal band. In this case, resource allocation in the frequency domain may be allocated for either PDSCH or PUSCH transmission (for the indicated RBG size).

3) When the RBG size exists in a specific range (eg, when the RBG size is between N _low and N _high ), the resource allocation field may indicate time and frequency resources. More specifically, some bits of all the bits of the resource allocation field may be used to indicate frequency domain resource allocation and the remaining bits may be used to indicate time domain resource allocation.

In one example, the frequency domain resource allocation may indicate an RBG to be allocated in the indicated RBG size. The time domain resource allocation may be indicative of what is allocated to a preset or indicated time-domain scheduling unit. Alternatively, the time domain resource allocation may be provided in the form of a pattern, and the number of the patterns may also vary according to the change of bits for the time domain resource allocation.

Alternatively, the time domain resource allocation and the frequency domain resource allocation may be combined. Specifically, the information on the allocated time and frequency resource pairs may be set in the form of a plurality of patterns. Bits of the entire resource allocation field may indicate the pattern.

One way to implement this is as follows. The terminal may be configured with a plurality of bandwidth parts, and each band part may be set by a contiguous set of PRBs, an RBG size used, a time domain resource allocation size, and the like. The band part index used in the DCI may be informed, and the RBG size and time information used in each band part may be used for resource allocation when each band part is indicated.

That is, the selection for the band portion may be representative of the selection for time and / or frequency resource scheduling unit in resource allocation. The terminal may be configured as a band subgroup for band parts that can be used together (ie, a band part that can dynamically change to one DCI size) among the configured band parts, and are the largest resource in each band subgroup. It may be assumed that the bit size of the resource allocation field in the band subgroup is determined according to the size of the allocation field.

This configuration may be parallel to the dynamic change of the band portion. It can be assumed that each band subgroup shares a CORESET. This is because the size of the scheduling DCI can also change when the CORESET changes, taking into account the case where the resource allocation field changes dynamically while the CORESET is shared.

Or, in this configuration, the band partial group can expect the terminal does not meet the baseband (baseband bandwidth) while sharing the CORESET (s). This may be assumed that the baseband of the terminal does not change in accordance with the maximum value of the band subgroup within the band subgroup.

Alternatively, in this configuration, higher layer signaling may be possible for whether the terminal may assume a band change or whether a retuning delay between the control signal and data may be assumed. If the delay assuming the band change is not set, it can be assumed that the band does not change and fits the maximum value.

Alternatively, one band portion may be set, and a set of time / frequency schemes of resource allocation of DCI, which may be indicated by CORESET (s) of the corresponding band portion, may be set. For example, when the band portion is composed of 200 resource blocks, the set of time / frequency schemes may consist of band, RBG size, time domain resource allocation information, and the like.

In one example the set of time / frequency schemes is entry 1 = (200 RB (band), 10 RB (RBG size), start OFDM symbol (4 bits), 4 slots (2 bits)), entry 2 = (100 16 RBs starting from the first RB, 1 RB (RBG size), and 0 for time domain resource allocation.

4) When there are several candidate values of RBG size, a method of indicating different RBG size or time-frequency resource allocation scheme may be as follows.

i) Explicit bits may be used for DCI. ii) It may be interpreted differently according to the CCE index to which DCI is mapped. This mapping may be a value that is set or always determined by a higher layer signal. iii) or scrambling of DCI or CRC.

5) In order to dynamically change when there are several time / frequency resources, the terminal may monitor CORESETs set in several band portions at the same time. The resource allocation method used for each reset may be different.

For example, a CORESET may be configured in each of the 200 RB band portion and the 10 RB band portion, and the bit size of the resource allocation field of each CORESET may be assumed as necessary to schedule 200 RB and 10 RB. More generally, bands and resource allocation information of schedulable data may be set for each CORESET.

More specifically, for the above schemes, the total bit field size for time and frequency resource allocation may be the same. In the above, the resource allocation for the frequency domain may indicate a resource allocated through a bitmap scheme for a given RBG size, or the RIV scheme (that is, contiguous with the starting RB or RBG index) based on the given RBG size as a basic unit. Or a method of indicating the number of RBs or RBGs).

The resource allocation for the time domain may include: starting time-domain scheduling unit index, last time-domain scheduling unit index, and / or continuation for PDSCH or PUSCH. It may be the number of time-domain scheduling units.

The time domain scheduling unit may be a symbol (reference numerology or numerology reference for DCI), or may be a plurality of symbols or a mini-slot. When the size of the symbol group is set and a scheduling unit is set based thereon, the size of a specific symbol group may be different from other symbol group sizes depending on the number of symbols constituting the slot.

Alternatively, a pattern for a symbol group in a slot or a plurality of slots may be set in advance or in accordance with an indication of a base station, and resource allocation may be performed based on a starting unit and a corresponding number of units.

For example, the symbol group pattern may be different according to a control region setting (for example, the number of symbols in the time domain). For example, the symbol group pattern in the slot consisting of seven symbols may be any one of the following. (3, 2, 2), (1, 2, 2, 2), (2, 2, 2, 1), (2, 2, 3), (2, 3, 2) and the like.

Information about the start / last / section may be present in a pattern form, and a resource allocation bit field may be used to indicate a corresponding pattern. More specifically, the information on the pattern may be indicated by the base station (via upper layer signaling or a third PDCCH).

An example of the pattern may be a RIV method (start symbol index, a method of notifying the number of consecutive symbols). If the bit field size for time domain resource allocation is changed according to the RBG size, resource allocation may be performed with some bits of the RIV scheme fixed to a specific value (eg, 0 or 1), or In the RIV scheme, the basic unit may be increased (eg, performed based on a plurality of symbols in performing in one symbol period).

Fixed field size for time and / or frequency resource allocation

In resource allocation, if the bit size of the resource allocation field is the same but the RBG size is changed, the resource combination that can be allocated may be different.

The manner in which the RBG size is changed may be at least one of 1) directly indicated in the DCI, 2) changed according to the band part change, or 3) changed according to the bit size of the resource allocation field.

In detail, the bit field for frequency domain resource allocation is configured based on a specific RBG size. As an example, the size of the bit field may be determined based on the maximum RBG size that can be set.

Alternatively, in a future wireless communication system, the base station may indicate the bit size of the resource allocation field. The specific RBG size or larger RBG size may be flexible resource allocation for all RBGs in a system band, a terminal band, or a predetermined band portion.

If the indicated RBG size is smaller than that, resource allocation may be possible for only some RBG sets. As a more specific example, when a frequency domain resource allocation is configured as a bitmap for an RBG, a specific RBG size (group) may represent all RBGs or RBG combinations within a band given to a corresponding UE. On the other hand, when the RBG size is small, resource allocation may be possible for only some RBG sets within a band given to the corresponding UE.

As a more specific example, it is assumed that the number of RBGs in the terminal band is N for the first RBG size, and the number of RBGs in the terminal band is M for the second RBG size. At this time, if the first RBG size is larger than the second RBG size, then M> N. However, if the resource allocation field is set based on the first RBG size, only the N or a subset of M RBGs for the second RBG size may be allocated through the resource allocation field.

From the standpoint of performing resource allocation, setting a larger RBG size may be for allocating more frequency resources, and conversely, setting a smaller RBG size may be for allocating a smaller frequency resource.

Alternatively, in a situation where the band portion BWP is flexibly changed, when the bit sizes of the resource allocation fields required in the scheduling BWP and the scheduled BWP are different, For example, the resource allocation for the scheduled band portion may be performed using the bit size of the resource allocation field in the scheduled band portion.

If the RBG size is small, the amount of resources that can be allocated using the bit size of the limited resource allocation field is limited. In this case, the base station may instruct the user equipment to select the RBG set in order to alleviate the constraint on resource allocation.

In detail, the resource allocation field in the frequency domain may be composed of an RBG size indicator, an RBG set indicator in a band, and / or an RBG indicator in an RBG set.

In one example, the candidates for the RBG set may be determined by the base station separately instructing the UE (eg, signaling and / or group-common PDCCH and / or a third DCI through a higher layer signal such as an RRC message). Instructions). Among candidates for the RBG set, a specific candidate may be indicated in the DCI scheduling the corresponding PDSCH or PUSCH.

Depending on the base station configuration, the RBGs in the RBG set may be localized (ie, adjacent to each other) or distributed (ie, separated from each other).

As a simple example, the base station may set the candidate (s) for the RBG set via signaling and / or PDCCH and / or third DCI via higher layer signal such as RRC message, which scheme is within the terminal band or system band. It may be in the form of a bitmap for RBGs.

Accordingly, the base station may map a plurality of consecutive RBGs to the same RBG set for localized resource allocation, and a plurality of non-contiguous RBGs for distributed resource allocation. RBG) may be mapped to the same RBG set.

Alternatively, the number of RBGs that can be represented according to the number of RBGs that can be expressed according to the bit size of the resource allocation field of the scheduling BWP starting from the lowest RBG of the scheduled BWP is scheduled. It may consist of.

According to the band portion (BWP), the number of PRBs constituting the RBG becomes relatively small, and / or the number of PRBs that can actually be used for data mapping in the RBG due to reserved resources, etc. becomes relatively small. In this case, the RBG may be excluded from the RBG set to be indicated. The relatively smaller RBG size may refer to a case where the size of the RBG becomes smaller than the size of the RBG set according to the band portion (BWP) size.

The foregoing may be applied regardless of the resource allocation type. Alternatively, in the resource allocation type of the bitmap method, a method in which the bit size of the required resource allocation field and the bit size of the actual resource allocation field are different as in the above method may be followed. The resource allocation type of the RIV scheme may configure the bit size of the resource allocation field based on the largest band portion or configure the bit size of the resource allocation field based on the largest band portion among the set band portions. This is because, in the RIV scheme, the bit size difference of the resource allocation field may be slight depending on the bandwidth portion size.

Alternatively, there may be a plurality of RBG sizes used when indicating resources in resource allocation. As a more specific example, when a band portion is composed of a plurality of RBGs, the size of a specific RBG follows a set RBG size (including a difference of +/- 1), and the size of another specific RBG includes all remaining PRBs of the band portion. Can be set.

9 illustrates a method for determining a resource block group (RBG) size according to an embodiment of the present invention.

Referring to FIG. 9, the apparatus determines the number of resource block groups N _RBG for a downlink band including a plurality of N ^DL _RB resource blocks (S101). The apparatus determines the size of each of the number N _RBG resource block groups.

For example, if the downlink system band or band portion is N^DL _RB Assume that it is composed of three resource blocks. In this case, if the size of one RBG is P resource blocks, that is, the size is P, the total number of RBGs (N_RBG) Is floor (N^DL _RB/ P). floor (x) is the function that outputs the largest integer in the range less than x (ceil (x) is the function that outputs the smallest integer in the range greater than x). At this time, N_RBG -ceil ((N^DL _RB mod P) / P) RBGs can be size P, if N^DL _RB If mod P is greater than zero, the size of the last RBG is P + (N^DL _RB mod P) can be given. Here, AmodB is a modulo operation that outputs the remainder when A is divided by B.

10 is a specific example of determining a resource block group size according to FIG. 9.

Referring to FIG. 10, it is assumed that a band, such as a system band or a band portion, is composed of N ^DL _RB (= 50) resource blocks. In this case, it is assumed that one RBG is composed of P (= 6) resource blocks. Then, the total number of RBGs (N _RBG ) is floor (50/6) = 8. In this case, according to the method of FIG. 9, the size of 8-ceil ((50mod6) / 6) = 7 RBGs is determined to be 6, and the size of the remaining RBGs is 6+ (50mod6) = 8.

As another example, suppose that the band portion consists of 50 PRBs, the bit size of the resource allocation field consists of 5 (bits), and the RBG size consists of 5 PRBs. In this case, the RBG configuration for the band portion may be composed of, for example, four RBGs having a size of 5 PRBs and one RBG having a size of 30 PRBs. In the above manner, there may be a problem that a specific RBG size may be excessively large.

Alternatively, when setting the size and number of RBGs with the bit size and the size of the band portion of the resource allocation field set or given, consider that the size difference between the configuration RBGs is less than 1 (PRB). Can be. Specifically, when the band portion is composed of N PRBs, and the bit size of the resource allocation field is set to M bits, the RBGs constituting the band portion are each RBG having a Ceil (N / M) size of M * Ceil. (N / M) -N, and RBG having Floor (N / M) in size may be M- (M * Ceil (N / M) -N). The order in which RBGs having different sizes are arranged may be to firstly arrange RBGs having the same RBG size and then to arrange RBGs having different RBG sizes.

In order to make the RBG sizes the same as otherwise, the majority of RBGs (except for a specific one of the total RBGs) should be set to Ceil (N / M) or Floor (N / M), Set the size of the remaining (one) RBG to include the remaining PRBs (for example, the size of N- (M-1) * Ceil (N / M) or N- (M-1) * Floor (N / M)) It may be set to have). For example, suppose that the band portion is composed of 50 PRBs (N = 50), and the bit size of the resource allocation field is composed of 13 (bits) (M = 13). In this case, the RBG configuration for the band portion includes 12 RBGs having a size of 4 PRBs (= ceil (50/13)), and an RBG having a size of 2 PRBs (= 50-12 * 4) of 1 Can be composed of dogs.

Although the above examples have described the resource allocation (interpretation) method according to the RBG size in the frequency domain, the resource allocation (interpretation) method according to the scheduling (time) unit in the time domain may be extended. Similarly, resource allocation for the time domain may be set for a specific scheduling unit, and resource allocation may be performed according to a scheduling unit value that is flexibly changed. More specifically, the RBG aggregation indicator may be represented by a time and / or frequency resource scheduling unit.

For example, the RBG set indicator may include information on a starting symbol index and / or duration along with information on the RBG constituting the RBG set. Alternatively, a basic time and frequency resource unit may be selected for each RBG in the scheduling unit of the time domain. Alternatively, the resource allocation (or scheduling unit) may not be changed flexibly for the time axis.

Alternatively, resource allocation for a frequency domain may be performed for a specific RBG set, and allocation information for the specific RBG set may be equally applied to a plurality of RBG sets in a band. For example, when all RBGs are configured in the form of a plurality of RBG sets, it may be considered that bitmap information for a specific RBG set is equally applied to each other RBG set.

In the above embodiment, the band may be a system band or a UE bandwidth and may be replaced by a bandwidth part. If a plurality of band parts are configured for a specific terminal, bandwidth part indicator information is transmitted, the RBG set may be limited to the corresponding band part, or the RBG set itself is a plurality of band parts. It may be configurable to RBGs in the.

Another way may be, for example, that two resource allocation types are set dynamically. Hereinafter, the frequency domain will be described, but may be applied to resource allocation in the time domain, or may be applied to time / frequency domain resources.

1) Resource allocation type 0: A bitmap having a bit size of RBG size K + floor (M / K), where M is the number of PRBs for a band set in the band portion.

2) Resource allocation type 1: bitmap with bit size of RBG size p * K + floor (M / p * K) + bitmap with bit size of (p * K)

11 shows an example for resource allocation type 1. FIG.

Referring to FIG. 11, the resource allocation type 1 increases the RBG size, gives a bitmap (RBG indicator) of which RBG is selected among the RBGs, and within (RBG) bitmap (RBG) within one RBG size. RB indicator at) allows RB-level resource allocation. It can be assumed that the bitmap within the RBG size is commonly applicable to the selected RBGs.

The aforementioned methods can be used in combination. For example, in order not to increase the bit size of the frequency domain much, the resource allocation scheme of the time domain may be changed while the set of allocable RBs differs according to the RBG size.

In a future wireless communication system, in performing time domain resource allocation, a terminal may indicate a start symbol index and / or a last symbol index for a PDSCH or a PUSCH through a scheduling DCI.

More specifically, the start symbol index and / or the last symbol index may be indicated in units of symbols constituting a slot or in symbol group units, or joint indication of the start symbol index and the last symbol index may be performed. It may be. For example, the start symbol index and the last symbol index may be combined and indicated by the RIV method. The RIV method may be a method of notifying a start symbol index and a duration.

In the future wireless communication system, the base station may set the set (s) for a plurality of time domain resources through the RRC signaling, each set is the slot index information and / or start symbol index, the PDSCH / PUSCH is mapped, And / or a combination of the last symbol index and the like. In addition, time domain resource allocation may be performed by indicating through scheduling DCI (DCI) for scheduling one of the set sets.

The set (s) set by the RRC may be set separately from slot format information (SFI) transmitted through a group common PDCCH. The SFI indicates a downlink portion, a gap, and / or an uplink portion in the slot. In this case, the SFI assumes that the downlink part is generally used from the first symbol of the slot, whereas in the case of time domain resource allocation, it is for the purpose of avoiding overlapping with the CORESET (control region) during PDSCH or PUSCH scheduling. The purpose and method are different because the first few symbols are not excluded from the way they are not mapped.

When time domain resource allocation is to be performed based on RRC signaling, it is necessary to determine a time domain resource allocation method before the RRC configuration is established and / or during the RRC resetting interval. The following is a more specific embodiment.

1) The parameter set (s) for the time domain resource (e.g., a combination of at least one of slot index information, start symbol index, last symbol index) may be selected from the physical broadcast channel (PBCH) and / or the remaining minimum system information (RMS) And / or may be configured through OSI (other system information). In a future wireless communication system, in delivering the minimum system information, part of the minimum system information may be transmitted through the PBCH, and the rest, that is, the RMSI may be transmitted through the PDSCH. More specifically, the time domain resource allocation of the scheme may be the case where the scheduling DCI belongs to a common search space or a group common search space. The common search space may again be a search space for RMSI and / or OSI transmission.

2) Dynamic time domain resource allocation may not be performed. In this case, the slot index may be a fixed value, and different values may be set for the PDSCH and the PUSCH. For example, the PDSCH may be transmitted in the same slot as the PDCCH, and the PUSCH may be transmitted after 4 slots from the PDCCH. In the case of the start symbol index, it may be designated as a symbol after the CORESET interval. More specifically, the PUSCH may be set to start symbol index through higher layer signaling (PBCH and / or RMSI and / or OSI) and / or DCI indication, or may be set to start from the first symbol of the configured slot. In the case of the last symbol index, it may be set through higher layer signaling (PBCH and / or RMSI and / or OSI) and / or DCI indication, or may be set to the last symbol of the slot. More specifically, the time domain resource allocation of the above scheme may be a case where the scheduling DCI belongs to a common search space or a group common search space. The common search space may again be a search space for RMSI and / or OSI transmission.

According to the multiplexing pattern of synchronization signal block (SSB) and CORESET # 0, different tables for time domain resource allocation may be used for PDSCH allocation. SSB means a block in which a synchronization signal and a physical broadcast channel (PBCH) are transmitted. In the case of the multiplexing patterns 2 and 3, since the length of the allocated symbols is limited to 2 symbols, the RMSI size that can be supported can be limited so that the coding rate of the RMSI is sufficiently small.

NR can support an RMSI size of approximately 1700 bits in one transport block for FR1, FR2 with appropriate RMSI settings. A transport block size (TBS) of up to 2976 bits can be supported for PDSCH by SI-RNTI. In particular, the subcarrier spacing of the {SS / PBCH block, PDCCH} may be [240, 120] kHz, or [120, 120] kHz. At this time, the initial downlink band portion may be composed of 24 or 48 PRBs. The initial downlink band portion means a downlink band portion that is valid until the terminal explicitly sets the band portion during or after RRC connection establishment.

Considering the DMRS overhead for the RMSI-PDSCH, the maximum number of available resource elements for PDSCH mapping may be 864. In this case, if the size of the RMSI is 1700 bits, the coding rate will be approximately 0.98. It may be necessary to support time domain resource allocation longer than 2 symbols to support a sufficiently large RMSI size.

When the subcarrier spacing of {SS / PBCH block, PDCCH} is [240, 120] kHz, considering that all SS / PBCH blocks are transmitted and all PDCCH scheduling RMSIs are transmitted, the number of available resource elements for PDSCH scheduling is determined. There may be no room to increase. However, if it is possible not to use any SS / PBCH block index, or if any SS / PBCH block index assumes the same bill direction, PDSCH allocation of two symbol intervals or more can be considered. In other words, for multiplexing pattern 2, the rows of the table below may be added to the default PDSCH time domain resource allocation.

When the terminal is scheduled to receive the PDSCH by the DCI, the time domain resource allocation field included in the DCI may indicate a row index in the 'PDSCH symbol allocation' table set by the higher layer. Each row indexed in the table may define the PDSCH mapping type assumed to receive the slot offset K ₀ , the start and length indicator (SLIV), and the PDSCH.

In a future wireless communication system, PDSCH or PUSCH may be scheduled over a plurality of slots through aggregation of multiple slots. In the above situation, time domain resource allocation may need to be extended to indicate for aggregated slots. The following is a more specific example of a time domain resource allocation method in a multi-slot aggregation situation.

1) Through RRC signaling, set aggregation (s) for time domain resources across multiple slots. Each set is a slot index and / or last slot index to start mapping of the PDSCH or PUSCH, and / or the number of slots to be aggregated and / or the starting symbol index for each aggregated slot and / or the last symbol for each aggregated slot. It may be composed of a combination of indexes and the like. The RRC configuration may be set when the multi-slot aggregation operation is set, and may be set independently of the RRC configuration for time domain resource allocation for one slot, and includes a super set including the same. superset).

2) A set of time domain resources for one slot case may be utilized for aggregated slots. Characteristically, the start symbol index in the set indicated (finally in DCI) may be commonly applied to each aggregated slot. In the case of the CORESET interval, it may be a suitable method because it cannot be regarded as being changed in the aggregated slots. The last symbol index in the next indicated set may be to apply to a particular aggregated slot. In particular, the specific slot may be the last or first slot among the aggregated slots. The last slot index for the remaining aggregated slots is (1) RRC signaling, (2) RRC signaling and DCI indication (which may be in the form of SFI or SFI pattern in particular), (3) SFI (group common PDCCH for that slot) From) and (4) SFI patterns (received from the group common PDCCH) for the corresponding slots.

<Compact frequency resource allocation>

In the future, the wireless communication system can support an application field requiring high reliability, and in the above situation, the amount of DCI transmitted on the PDCCH can be reduced. More specifically, it is necessary to efficiently reduce the size of a specific field (particularly, a resource allocation field) among DCI contents.

Resource allocation may use a RIV method (ie, a method of expressing the number of consecutive RBs with the starting RB index or the number of consecutive RB sets with respect to the specific RB set). The above scheme can reduce the bit size required for resource allocation by representing only contiguous resource allocation.

In order to efficiently manage multiplexing between different PDSCHs or PUSCHs from a network perspective, it is necessary to set a scheduling granularity (scheduling unit) to an RBG size. In a more specific example, in the LTE system, an RBG size is determined according to a system band, and in the case of at least resource allocation type 0, resource allocation may be performed in units of RBGs. In the above case, if the resource allocation is not in RBG units, resource waste may occur. The information on the step size or information on the RBG size in the case of simple resource allocation is set to a specific RBG size (eg, an RBG size set in association with a band) or the base station is a terminal. To (eg, via at least one of a higher layer signal, a group common PDCCH, or a third DCI). The specific RBG may be larger or smaller than the set RBG size depending on the size of the system band or the terminal band or the band portion. Like the other RBGs, the specific RBG may be handled / indicated as the same allocated resource. That is, when the resource is allocated, the RBG is indicated to the allocated RBG regardless of the RBG size, and the indicated RBG may be allocated to the PRBs according to the RBG size. If the RBG size changes dynamically, in order to maintain the total bit size for simple resource allocation (e.g., the largest or smallest of the candidate values, or as indicated by the base station), Value, the total bit size may be set.

In the above situation, the scheduling unit in the RIV scheme may be changed according to the indicated RBG size. Therefore, when the indicated RBG size is larger than the specific RBG size referred to in setting the size, the RBG may be padded to match the total bit field size in which a specific value (for example, 0) is set in the MSB or LSB in the bit field for the RIV. On the contrary, when the value is small, it may be assumed that a single or a plurality of bits of the MSB or LSB are cut in the bit field for the RIV, and when the RIV value is interpreted, the truncated bits are filled with a specific value (for example, 0). have.

Distributed resource allocation and / or frequency hopping may be required to secure frequency diversity, which may be performed by applying interleaving after simple resource allocation. In the case of the interleaving method, a row-by-row or column-by-column is input to a matrix of a specific size and extracted by a column (or a row) (hereinafter, referred to as a block). Interleaver method) can be used. Alternatively, interleaving may be performed based on pseudo-random functions. In this case, the position of the frequency resource may be moved based on the random number. More particularly, the interleaving may be performed within the size of an active BWP in which a PDSCH or a PUSCH is scheduled, or a separate specific frequency domain (eg, a base station indicates (high layer signaling). And / or (via DCI)).

In the above situation, it is possible to ensure the same hopping pattern and multiplexing between the transmission channels by matching a hopping region equally among terminals having different band portions.

However, in the case of the above scheme, when the difference between the band portion and the hopping region for a specific terminal is large, the throughput may be reduced, and alternatively, the hopping regions may be set to be orthogonal to each other. .

In more detail, the hopping region may be set non-contiguous, and based on this, the hopping region may prevent overlapping doped resources between different band parts.

As another method, for example, in performing the block interleaving method, the size of the row of the block interleaver may be set regardless of the partial band size (for example, using a third higher layer signal signaling). More specifically, it may be set through PBCH or RMSI, or may be updated by RRC.

In the above case, the row size for the block interleaver may be equally set even between different partial bands. More specifically, the band of the UE may be divided into X subregions, and the number of subregions may be defined as the number of rows of the block interleaver matrix. In this case, the specific region value of the matrix may be filled with NULL, and the portion of the NULL may be skipped when the index is extracted column by column. That is, the hopping region may be avoided by avoiding a specific region through the above scheme. More specifically, NULL can be selected by selecting specific row (s) (and / or offsets into elements) for the matrix for the block interleaver, or by designating the start and end elements. It may be. The above information may be indicated by the base station (eg, higher layer signaling).

12 shows an example for hopping region setting.

The pseudo-random scheme may be performed based on cell ID, partial band specific information, or third signaling (eg, virtual ID). The above scheme may be to efficiently support multiplexing between terminals in a cell or partial band while supporting inter-cell or partial band randomization. When considering multiplexing between different PDSCHs or PUSCHs (particularly, performing resource allocation in RBG units), it may be useful that the resource allocation is in RBG units even after interleaving. That is, the unit of interleaving may be an RBG unit. The RBG may be the same as the RBG size at the time of resource allocation instruction or may be set differently. That is, the base station may separately indicate (eg, higher layer signaling or a group common PDCCH or a third DCI) to the UE separately from the RBG size assumed for resource allocation and the RBG size assumed for interleaving.

13 illustrates a signaling method of an apparatus in a wireless communication system according to the present invention.

Referring to FIG. 13, an apparatus, for example, a base station transmits first information indicating a first resource unit to be used for interleaving through an upper layer signal to a terminal (S201), and in the first resource unit. Interleaving is performed on a specific resource for the terminal (S202). In this case, the first information may be instructed separately from the second information indicating the second resource unit used by the base station for resource allocation to the terminal. The first resource unit may be composed of a plurality of resource blocks, and the second resource unit may be composed of a plurality of resource blocks. However, the number of resource blocks constituting the first and second resource units may be the same or different.

For example, a resource allocation type may be a resource allocation type 0 and a resource allocation type 1 in a wireless communication system. Resource allocation type 1 is a resource allocation scheme that indicates a number (ie, length) of a starting (virtual) resource block and allocated resource blocks consecutively from the starting (virtual) resource block. Interleaving may be used. Here, interleaving may be a mapping of a virtual resource block to a physical resource block. In this case, interleaving may be performed in a first resource unit. For example, when L virtual resource blocks are referred to as resource block bundles, the L virtual resource blocks are mapped to physical resource blocks in units of resource block bundles.

In a conventional wireless communication system, interleaving is performed in units of one resource block. On the other hand, in the present invention, interleaving may be performed in units of a plurality of resource blocks. According to this method, there is an advantage in the multiplexing between resources of the terminals. For example, resource allocation for UEs 1 and 2 is performed in RBG units, which are a bundle of 1 or 4 resource blocks, respectively. If interleaving is performed in units of one resource block for resources allocated for UE 1, The allocated resource on which the interleaving of the terminal 1 is performed may overlap the plurality of RBGs of the terminal 2, and in this case, the scheduling of the terminal 2 may be restricted. For example, when interleaving is performed in units of two resource blocks or four resource blocks, multiplexing between resources of terminals 1 and 2 may be more efficient. To this end, in the present invention, the first information indicating the first resource unit used for interleaving, the second information indicating the second resource unit used by the base station for resource allocation to the terminal. Can be specified separately.

On the other hand, resource allocation type 0 allocates resources in units of RBG, does not use interleaving, and can inform the UE of an RBG allocated in a bitmap manner. In this case, the RBG unit may be the second resource unit. The second resource unit is the size P of the RBG unit according to the size of the band (band portion) (that is, the number of resource blocks constituting the band (band portion)) and which of the plurality of settings is used, as shown in the following table. Can be determined. In this case, the second information may indicate any one of settings 1 and 2 in Table 6.

TABLE 6

In the present invention, the first information is directed to the terminal separately from the second information indicating a second resource unit assumed by the base station at the time of resource allocation to the terminal. For example, the first information and the second information may be signaled through at least one of a higher layer signal such as a radio resource control (RRC) message / signal, a group common PDCCH, or a third DCI.

In addition, the first resource unit may be different from the second resource unit. For example, the number of resource blocks constituting the first resource unit and the number of resource blocks constituting the second resource unit are independent of each other and may have different values. The first resource unit may be determined by the first information, and the second resource unit may be determined based on the number of resource blocks constituting the band and the second information.

13 is described in terms of a base station. In view of a terminal, first information indicating a first resource unit to be used for interleaving through an upper layer signal is received from a base station and interleaved in the first resource unit. Receiving a specific resource from the base station. In this case, the first information may be instructed separately from second information indicating a second resource unit used by the base station for resource allocation to the terminal.

Alternatively, it may be an RBG size for a general resource allocation type (eg, bitmap scheme) in the partial band.

In addition, depending on inter-slot hopping and / or interslot hopping, the frequency domain / resource hopped by slot or by symbol group may be different. In performing the resource allocation in the above scheme, the location of the PRB may be a hopping based on a slot or symbol index at which the PDSCH or PUSCH starts, or a specific time point (eg, a sub Resource allocation may be performed based on a hopped PRB index calculated based on a start of a frame, a start of a frame, etc.).

More specifically, the hopping period in the time domain may be set in a fixed form (for example, by dividing based on a center point in the slot or between a 7th symbol and an 8th symbol) in consideration of multiplexing among a plurality of terminals. Can be. More specifically, the hopping interval in the time domain may be set to higher layer signaling (eg, at least one of PBCH, RMSI, RRC) and / or indicated in DCI in consideration of multiplexing between PDSCHs or PUSCHs having different configuration symbols. Can be. In case of non-slot based scheduling, intra-slot frequency hopping may be applied and hopping may not be performed in the non-slot period.

Alternatively, performed based on a specific offset within a predetermined hopping region (eg, active uplink band portion) or a hopping region signaled by a higher layer (eg, PBCH or RMSI or RRC). It may be.

For example, a PUSCH or PDSCH transmitted in PRB N may be transmitted in {(PRB N + offset) mod uplink band portion bandwidth} in a second hopping interval. More specifically, the hopping interval in the time domain is set in a fixed form (for example, divided based on a center point in a slot or between a 7th symbol and an 8th symbol) in consideration of multiplexing among a plurality of terminals. More specifically, the number of configuration symbols may be set to higher layer signaling (eg, PBCH or RMSI or RRC) in consideration of multiplexing between different PDSCHs or PUSCHs and / or indicated in DCI.

The offset is a value signaled / set by a cell-specific higher layer signal, or an offset value set for each band part, or setting a hopping region as a parameter (eg, 1 / N, 2 of the hopping region). / N, ... (N-1) / N multiple times) may be used.

And / or a plurality of offsets are set semi-statically, the final application value may be in the form indicated by the DCI.

Multiple subband sizes / offsets and hopping patterns in frequency hopping may be set. The setting may be set differently according to the configured band portion BWP. Typically, a subband size and an offset may be configured for each hopping pattern, and a corresponding value may be set differently for each band portion.

Since the hopping pattern may have an efficient value different according to frequency diversity gain and multiplexing between terminals, a hopping pattern to be used for each band part may be differently set or one of several hopping patterns may be dynamically determined. An example of such a hopping pattern is as follows.

1) Type 1: The index of the RB or RBG may be increased by the cell-specific offset value. This allows the terminals to use the same hopping pattern even if they have different band portions, thereby minimizing a case where collision occurs due to hopping between terminals. Alternatively, the offset setting itself is performed for each band part, and the network may consider setting the same value for the plurality of band parts.

2) Type 2: As in LTE PUCCH Type 1, the hopping band configured to the UE may be divided in half to increase the RB or RBG index by the corresponding value. This may increase collision by hopping between terminals having different band portions at different offsets, but may obtain diversity gain. When using this method, the hopping band can be offset by a specific value rather than dividing by half.

3) Type 3: Hopping may be applied to a hopping band larger than its own band portion, such as LTE PUCCH type 2. When the hop is hopped to an RB or RBG index larger than the band part, it may be to move an absolute frequency location of the uplink band part according to the hopping. Alternatively, multilevel hopping may be performed when hopping is applied. For example, one uplink band portion may be divided into several subbands, type 1 or 2 may be performed in the sub band, and type 1 or type 2 may be performed for each sub band again.

Hopping in the initial uplink band portion where message 3 is transmitted may also follow the above scheme, and the hopping scheme may be transmitted in a random access response (RAR). In transmission of message 3, considering the case where the initial uplink band portion is small, it may be considered that the absolute frequency position of the uplink band portion is changed when at least inter-slot hopping is applied. In other words, frequency hopping may be performed within a hopping band set based on common PRB indexing, and the corresponding hopping band may be set by RSMI. The physical location of the initial UL band portion may be changed by the hopping. This may apply only in case of inter slot slot hopping or only in the initial transmission or retransmission of message 3.

More generally, inter-slot hopping may be performed within a cell common or group common hopping band based on common PRB indexing, and in intra-slot hopping in an active band portion of a terminal. Can be.

The advantage of the above scheme is that when supporting a small RBG size (for example, 1 RB granularity), when RIV resource allocation is performed with 1 RB granularity, only interleaving can be performed with RBG size granularity Is the point. An advantage of the above scheme is that while allocating resources smaller than the RBG size, the allocated RBs can be distributed while considering multiplexing with other PDSCHs or PUSCHs (ie, maintaining an RBG grid).

In the case of simple resource allocation, it is possible to consider reducing the combination of possible allocated resources in order to further reduce the corresponding bit field size. For example, the relationship between possible allocated resource combinations may be to have a nested structure. In one example, the starting RB may be limited.

14 is a block diagram illustrating an apparatus in which an embodiment of the present invention is implemented.

Referring to FIG. 14, the apparatus 100 includes a processor 110, a memory 120, and a transceiver 130. The processor 110 implements the proposed functions, processes and / or methods. The memory 120 is connected to the processor 110 and stores various information for driving the processor 110. The transceiver 130 is connected to the processor 110 to transmit and / or receive a radio signal.

The apparatus 100 may be a base station or a terminal.

The processor 110 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a data processing device, and / or a converter for converting baseband signals and wireless signals to and from each other. Memory 120 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. The transceiver 130 may include one or more antennas for transmitting and / or receiving wireless signals. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. The module may be stored in the memory 120 and executed by the processor 110. The memory 120 may be inside or outside the processor 110 and may be connected to the processor 110 by various well-known means.

Claims (19)

1. In the signaling method related to resource allocation of a base station in a wireless communication system,

   Transmitting first information indicating a first resource unit used for interleaving to the terminal through an upper layer signal, and

   Interleaving is performed on a specific resource for the terminal in the first resource unit,

   Wherein the first information is instructed to the terminal separately from second information indicating a second resource unit used by the base station in resource allocation to the terminal.
2. The method of claim 1,

   The interleaving is characterized in that for mapping a virtual resource block (physical resource block) to a physical resource block (physical resource block).
3. The method of claim 1, wherein the first resource unit is different from the second resource unit.
4. The method of claim 1,

   The higher layer signal is a radio resource control (RRC) signal.
5. The method of claim 1, wherein the second resource unit is determined based on the number of resource blocks constituting a band and the second information.
6. The device,

   A transceiver for transmitting and receiving wireless signals; And

   And a processor operating in conjunction with the transceiver, wherein the processor includes:

   Transmitting first information indicating a first resource unit used for interleaving to the terminal through an upper layer signal, and

   Interleaving is performed on a specific resource for the terminal in the first resource unit,

   And the first information is instructed to the terminal separately from second information indicating a second resource unit used by the device in resource allocation to the terminal.
7. The method of claim 6,

   The interleaving is characterized in that for mapping the virtual resource block (virtual resource block) to a physical resource block (physical resource block).
8. 7. The apparatus of claim 6, wherein the first resource unit is different from the second resource unit.
9. The method of claim 6,

   And the upper layer signal is a radio resource control (RRC) signal.
10. The apparatus of claim 6, wherein the second resource unit is determined based on the number of resource blocks constituting a band and the second information.
11. A method for determining the size of a resource block group in a wireless communication system,

    Determine a number N _RBG of a resource block group (RBG) for a downlink band including a plurality of N ^DL _RB resource blocks, and

    Determine a size of each of the number N _RBG resource block groups,

    When the plurality of (N ^DL _RB ) resource blocks are not a multiple of the size P of one resource block group configured for the downlink band, remaining one except for one of the number N _RBG resource block groups The size of each of the resource block groups is a size P of the resource block group set for the downlink band, and the size of the one resource block group except for the resource block group is the remainder in the plurality of N ^DL _RB resource blocks. And resource blocks excluding resource block groups.
12. 12. The method of claim 11, wherein the resource block group is composed of a plurality of resource blocks.
13. 12. The method of claim 11, wherein the size P of the resource block group indicates how many resource blocks the resource block group is composed of.
14. In the method of operating a terminal in a wireless communication system,

    Receiving first information indicating a first resource unit used for interleaving through an upper layer signal from a base station, and

    Receive a specific resource interleaved in the first resource unit from the base station,

    The first information may be indicated separately from second information indicating a second resource unit used by the base station for resource allocation to the terminal.
15. The method of claim 14,

    The interleaving is characterized in that for mapping a virtual resource block (physical resource block) to a physical resource block (physical resource block).
16. 15. The method of claim 14, wherein the first resource unit is different from the second resource unit.
17. The method of claim 14,

    The higher layer signal is a radio resource control (RRC) signal.
18. 15. The method of claim 14, wherein the second resource unit is determined based on the number of resource blocks constituting a band and the second information.
19. The terminal,

    A transceiver for transmitting and receiving wireless signals; And

    And a processor operating in conjunction with the transceiver, wherein the processor includes:

    Receiving first information indicating a first resource unit used for interleaving through an upper layer signal from a base station, and

    Receive a specific resource interleaved in the first resource unit from the base station,

    And the first information is indicated separately from second information indicating a second resource unit used by the base station in resource allocation to the terminal.

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