JP2023130483A - Communication system and method - Google Patents

Abstract

To facilitate provision of efficient control resource set.SOLUTION: This disclosure includes: a receiver for receiving a control signal from a base station in a first set of control resources and a second set of the control resources; a transmitter for transmitting the control signal and data; and a circuit for controlling the transmitter so as to transmit a random access message associated with the first set of the control resources and so as to transmit communication device capability indication, and controlling the receiver so as to monitor a control resource in the first set of the control resources after the random access message is transmitted and so as to receive a configuration of the second set of the control resources within the first set of the control resources, and controlling the receiver to monitor the control resource in the first set and/or the second set in the control resources after receiving the configuration of the second set of the control resources.SELECTED DRAWING: Figure 16

Description

The present disclosure relates to the configuration of control resource sets in networks with complex numerologies and capabilities of communication devices and corresponding integrated circuits.

Currently, the 3rd Generation Partnership Project (3GPP) is working on technical specifications for the next release (Release 15) of next generation cellular technology, also known as 5th Generation (5G). At the 71st Radio Access Network (RAN) meeting of the 3GPP Technical Specification Group (TSG) (March 2016, Gothenburg), the first 5G consideration item "Considerations on new radio access technologies" including RAN1, RAN2, RAN3 and RAN4 was announced. ” has been approved and is expected to become a Release 15 work item that will define the first 5G standards.

The purpose of this study item is to develop "new radio (NR) access technologies" that operate at frequencies up to 100 GHz and have widespread use as defined during the RAN requirements study. (see, e.g., current version 14.0.0 of ``Reference Document 1'', available at www.3gpp.org, the entire contents of which are incorporated herein by reference). .

One objective is to support all usage scenarios defined in [1], including at least Enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communications (URLLC), and Massive Machine Type Communications (mMTC). The goal is to provide a single technology framework that addresses your needs, requirements, and deployment scenarios. For example, eMBB deployment scenarios may include indoor hotspots, dense urban, rural, urban macro, high speed, etc., while URLLC deployment scenarios may include industrial control systems, mobile healthcare (remote monitoring, diagnosis and treatment), real-time control of vehicles, wide-area monitoring and control systems for smart grids, whereas mmTCs include non-time-based systems such as smart wearables and sensor networks. Scenarios with multiple devices involving critical data transfer may be included.

The second purpose is forward compatibility. Backwards compatibility with Long Term Evolution (LTE) is not required, thereby facilitating the introduction of completely new system designs and/or new functionality.

The basic physical layer signal wave will be an orthogonal frequency division multiplexing (OFDM) based signal wave to support non-orthogonal waveforms and multiple access as much as possible. Additional features to OFDM are being considered, such as, for example, discrete Fourier transform (DFT) spread OFDM (DFT-S-OFDM), and/or variants of DFT-S-OFDM, and/or filtering/windowing. In LTE, cyclic prefix (CP)-based OFDM and DFT-S-OFDM are used as waveforms for downlink and uplink transmissions, respectively. One of the design goals in NR is to seek as common a waveform as possible for the downlink, uplink and sidelink. It is believed that the introduction of DFT spreading may not be needed in some cases of uplink transmission. The term "downlink" refers to communication from an upper node to a lower node (eg, from a base station to a relay node or UE, from a relay node to a UE, etc.). The term "uplink" refers to communication from a lower node to a higher node (eg, UE to relay node or base station, relay node to base station, etc.). The term "sidelink" refers to communication between nodes at the same level (eg, between two UEs, or between two relay nodes, or between two base stations).

In addition to waveforms, several basic frame structures and channel coding schemes are under development to achieve the goals mentioned above. Different use cases/deployment scenarios for NR have diverse requirements in terms of data rate, latency, and coverage, as identified in [1]. For example, eMBB can support peak data rates (20 Gbps on the downlink and 10 Gbps on the uplink) and user-experienced data rates that are approximately three times the speeds offered by International Mobile Telecommunications-Advanced (IMT-Advanced). is assumed. On the other hand, in the case of URLLC, more stringent requirements are imposed for ultra-low latency (0.5 ms each for UL and DL for user plane latency) and high reliability. Finally, mMTC demands high connectivity density (1,000,000 devices/km2 in urban environments), extensive coverage in harsh environments, and extremely long battery life (15 years) for low-cost devices. .

Therefore, an OFDM numerology (eg, subcarrier spacing, OFDM symbol period, CP period) and number of symbols per scheduling interval that is appropriate for one use case may not work well for another use case. For example, low-latency applications require shorter OFDM symbol periods (larger subcarrier spacing) and/or fewer symbols per scheduling interval (also referred to as transmission time interval (TTI)) compared to mmTC applications. obtain. Furthermore, deployment scenarios with large channel delay spreads require longer CP periods compared to scenarios with short delay spreads. Therefore, the subcarrier spacing should be optimized to maintain similar CP overhead.

At the 3GPP RAN1#84bis meeting (April 2016, Busan), it was agreed that NR needs to support multiple values of subcarrier spacing. The value of the subcarrier spacing is derived from a specific value of the subcarrier spacing multiplied by N, where N is an integer scaling factor. At the 3GPP RAN1 #85 meeting (Nanjing, May 2016), it was concluded as a working assumption that the LTE-based numerology with 15 kHz subcarrier spacing is the baseline design for the NR numerology. Regarding the scaling factor N, it was concluded that N=2 ⁿ (n is an integer such as 0, 1, 2, -1, -2, . . . ) as an assumption for the baseline design. Correspondingly, subcarrier spacings of 15 kHz, 30 kHz, and 60 kHz are being considered.

FIG. 1 shows three different subcarrier spacing settings (15kHz, 30kHz, and 60kHz) and corresponding symbol periods. The symbol period Tu and the subcarrier spacing Δf are directly related by the formula Δf=1/Tu. Similar to LTE systems, the term "resource element" is used in the uplink of one OFDM symbol or Single Carrier (SC) Frequency Division Multiple Access (SC-FDMA) (LTE, and possibly in the uplink NR). (also used) may be used to indicate the smallest resource unit consisting of one subcarrier over the length of a symbol.

To support multiplexing of different services with diverse requirements, the 3GPP RAN1#85 conference requires that NR support multiplexing of different numerologies within the same NR carrier bandwidth (from a network perspective). agreed. On the other hand, from the UE's perspective, the UE may support one or more usage scenarios (eg, an eMBB UE or a UE supports both eMBB and URLLC). However, supporting multiple numerologies may complicate UE processing.

It is also recognized that NR should support flexible network and user equipment (UE) channel bandwidth for several reasons: First, NR supports operation in a very wide range of spectrum, from sub-GHz to tens of GHz, with a variety of very different configurations in terms of available spectrum and therefore also in terms of possible transmission bandwidth. is expected to do so. Second, many frequency bands used for NR are not yet well specified, suggesting that the size of the spectrum allocation is still unknown. Third, NR is expected to support a wide range of applications and use cases, some of which require very extensive UE transmit/receive bandwidth, and others. Some require very low UE complexity, meaning much lower UE transmit/receive bandwidth. Therefore, in the 3GPP RAN#85 conference, there was agreement that the NR physical layer design should be such that devices with different bandwidth capabilities can efficiently access the same NR carrier regardless of the NR carrier bandwidth. It was done.

3GPP TR 38.913 Study on Scenarios and Requirements for Next Generation Access Technologies

One non-limiting and exemplary embodiment facilitates providing an efficient set of control resources for systems using complex numerology.

In one general aspect, the techniques disclosed herein include a receiver capable of receiving control signals from a base station in a first set of control resources and a second set of control resources; a transmitter capable of transmitting signals and data; and a transmitter operable, in operation, to transmit a random access message associated with the first set of control resources and to transmit a communication device capability indication. controlling and monitoring the control resources in the first set of control resources after transmitting the random access message; and receiving a configuration of the second set of control resources within the first set of control resources. a circuit controlling the receiver to monitor the control resources in the first set of control resources and/or the second set of control resources after receiving the configuration of the second set of control resources; A communication device comprising:

The general or specific embodiments may be implemented as a system, method, integrated circuit, computer program, storage medium, or any selective combination thereof.

Additional benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. Although these benefits and/or advantages may be obtained individually by the various embodiments and features of this specification and drawings, all of them may be used to obtain one or more of such benefits and/or advantages. need not be provided.

1 is a schematic diagram showing various numerologies; FIG. FIG. 2 is a schematic diagram showing an example of a configuration of two control resource sets. FIG. 2 is a schematic diagram showing an example of a configuration of two control resource sets. FIG. 2 is a flow diagram illustrating an example procedure performed by a communication device to obtain first and second sets of control resources after power-on. 2 is a schematic diagram illustrating an exemplary configuration of a first set of control resources in a time-frequency resource grid; FIG. FIG. 2 is a schematic diagram illustrating an example configuration of a second set of control resources in a time-frequency resource grid; FIG. 2 is a schematic diagram illustrating an exemplary configuration of first and second control resource sets centered around frequency; FIG. 2 is a schematic diagram illustrating an exemplary configuration of first and second non-frequency centered control resource sets; FIG. 2 is a schematic diagram showing an example of a configuration in which first and second control resource sets are separated. FIG. 3 is a schematic diagram illustrating frequency hopping of a first control resource set; FIG. 2 is a schematic diagram illustrating frequency hopping of a first set of control resources as well as a second set of control resources; FIG. 2 is a schematic diagram illustrating how scheduling units that are different in time are aligned to subframe boundaries (every 1 ms); FIG. 2 is a schematic diagram illustrating how a control resource set is represented in the frequency domain; FIG. 2 is a block diagram showing the configuration of a communication device and a base station. FIG. 1 is a block diagram showing the architecture of a communication system. 2 is a flowchart illustrating a method for configuration of Set 1 and Set 2 in a communication device and a base station. 2 is a schematic diagram illustrating the division of radio resources into corresponding resource scheduling units according to three different numerology schemes; FIG. FIG. 2 is a sequence diagram representing an exemplary random access procedure.

A "mobile station" or "mobile node" or "user terminal" or "user equipment (UE)" or "communications device" is a physical entity within a communication network. One node may have several functional entities. A functional entity refers to a software or hardware module that implements and/or provides a predetermined set of functionality to a node or other functional entities of a network. A node may have one or more interfaces that attach the node to communication equipment or media with which the node may communicate. Similarly, a network entity may have a logical interface that attaches the functional entity to a communication facility or medium through which it can communicate with other functional entities or corresponding nodes.

The term "base station" as used herein refers to a physical entity within a communication network. The physical entity performs several control tasks regarding the communication device, including one or more of scheduling and configuration. Base station functionality and communications device functionality may also be integrated into a single device. For example, a mobile terminal may implement the functionality of a base station for other terminals.

The term "radio resource" or "resource" as used in the claim set and this application should be broadly interpreted as referring to a physical radio resource, such as a physical time-frequency radio resource. .

As used herein, "numerology" (and other similar terms such as "OFDM numerology") refers to the way in which physical time-frequency radio resources are handled in a mobile communication system, in particular how these resources are , should be broadly understood as referring to the way in which resources are divided into resource scheduling units that are allocated by a scheduler (eg, within a radio base station). In other words, the numerology scheme also uses the physical time-frequency features mentioned above, such as subcarrier spacing and corresponding symbol period, TTI length, number of subcarriers and symbols per resource scheduling unit, cyclic prefix length, etc. It may be seen as defined by the parameters used to divide radio resources into resource scheduling units. These parameters are sometimes referred to as L1 (Layer 1) parameters since they are primarily used in the physical layer to implement uplink transmissions and to receive downlink transmissions.

The term "resource scheduling unit" is to be understood as a group of physical time-frequency radio resources that is the smallest unit that can be allocated by a scheduler. Accordingly, the resource scheduling unit comprises a time-frequency radio resource composed of one or more consecutive subcarriers over one or more symbol periods, according to certain characteristics of the numerology scheme.

As used in the claim set and in this application, the term "data transmission usage scenario" or simply "usage scenario" or "use case" broadly refers to a mobile/fixed terminal usage example. May be interpreted as a range. By way of example, usage scenarios being considered for new 5G considerations may be e.g. eMBB, mMTC, or URLLC, as introduced in the background section.

The term "control resource" refers to a resource for carrying control information rather than user data (payload). Control information may include, but is not limited to, resource allocation for downlinks, uplinks, or sidelinks.

The present disclosure provides configuration of control resource sets in networks with multiple numerologies (such as OFDM numerologies) and UE capabilities.

An example of a system to which the present disclosure is applicable may be NR. For example, eMBB, URLLC and mMTC may have different OFDM neurology. For example, URLLC may use large subcarrier spacing, such as greater than 15 kHz, and short scheduling intervals to achieve low delays, eg, 0.5 ms or less. On the other hand, eMBB may use large subcarrier spacing and long scheduling intervals to reduce control overhead, while the latency requirements are relaxed somewhat, for example to up to 4 ms. Furthermore, it is envisioned that mMTC requires small carrier spacing (eg, 15 kHz or less) due to the large number of connections within narrow bandwidth and wide coverage. In these and perhaps additional use cases, the controlled resource set configuration disclosed herein may be employed.

Regardless of the actual NR carrier bandwidth, in order to provide efficient access NR carrier to devices with different bandwidth capabilities, the control channel is In no case should it be spread across the entire system bandwidth. Specifically, in legacy LTE, a physical downlink control channel (PDCCH) is used by base stations (referred to as eNBs) to transmit downlink control information (DCI) to regular UEs. The DCI includes downlink scheduling assignments, uplink scheduling grants, and uplink power control information, as well as additional configuration parameters. In the frequency domain, the PDCCH is mapped to resource elements spread over the entire system bandwidth. In the time domain, the number of symbols occupied by the PDCCH is indicated by the Physical Control Format Indicator Channel (PCFICH).

In general, in NR, similar mechanisms may also exist for transmitting control information (i.e., downlink control information) from a base station to a communication device. The control information may be used, among other things, to schedule resources that may be further used for control information or payloads. For example, a base station transmits DCI on a set of controlled resources that must be monitored by communication devices. Here, the term "monitoring" refers to receiving by a communications device a signal carried in a control resource set, in which control information is directed to the communications device (exclusively or to a group of which the communications device is a member). refers to determining whether something is true or not. Such monitoring may include performing blind detection, as in the case of LTE. In other words, the communication device detects and decodes the signals in the control resource by using the communication device's own identity. The identity may be used to scramble the CRC or otherwise. Blind detection may also be attempted with different group identities to monitor (group) common DCI. If monitoring reveals a DCI addressed to a communicating device, the communicating device decodes that DCI and uses the information received therein (e.g., resource grants/allocations) to determine whether the DCI was signaled in the DCI. Access allocated resources. In legacy LTE, DCI may be addressed to a group of UEs. Such a DCI is called a group or common DCI. On the other hand, the DCI may be addressed to an individual UE, in which case it is called UE-specific DCI. PDCCHs carrying different DCIs for different UEs/groups are distinguished by a Radio Network Temporary Identifier (RNTI) embedded in a Cyclic Redundancy Check (CRC). For example, a UE-specific C-RNTI (cell RNTI) is used for normal unicast data transmission. After checking the CRC of the PDCCH with its C-RNTI, the UE may determine whether the PDCCH is addressed to it. For (group) common DCI, SI-RNTI, P-RNTI, RA-RNTI, and TPC-PUCCH/PUSCH- for system information, paging, random access response, and PUCCH/PUSCH uplink power control commands, respectively. Other types of common RNTI are used, such as RNTI.

In addition to the PDCCH, a typical UE in legacy LTE may be configured to monitor an enhanced PDCCH (EPDCCH) over a subset of the system bandwidth. However, the configuration of the EPDCCH is typically provided to the UE via radio resource control (RRC) signaling whose transmission is scheduled on the PDCCH. Therefore, a UE monitoring EPDCCH is normally able to receive PDCCH. Generally, a normal UE in LTE is required to have full system bandwidth capability to receive control information even when EPDCCH is employed.

In NR, the bandwidth capabilities of the UE are typically limited by the system Less than the bandwidth. As a result, a control channel spanning all system bandwidth does not facilitate efficient system design, at least for common DCI. To facilitate more efficient system design, in this disclosure the (group) common control channel is transmitted with limited bandwidth so that all UEs (within a group) with different capabilities can use it. Can be decrypted. Thus, duplicate messages do not need to be sent to each individual UE with matching capabilities, although such transmission would have dramatically increased signaling overhead.

On the other hand, even if the NR UE is capable of supporting the full system bandwidth, it may not always need to operate at full bandwidth capability. A larger operating radio frequency (RF) bandwidth means that the UE also consumes more power. If the control channel is transmitted using a subset of the system bandwidth, the UE's monitoring effort may be reduced. This makes it possible to reduce the power consumption of the UE.

Therefore, a control subband or control resource set may be defined that should be monitored by all UEs. A control resource set is a set of time-frequency radio resources within which a UE attempts to blindly decode DCI (or control information in general). The control resource set is advantageously defined on a control subband that is narrower than the system bandwidth. In this disclosure, examples of control resource set configurations are presented that may be beneficial for NRs where multiple numerologies coexist in the system and UEs have diverse bandwidth capabilities. It is something. To facilitate efficient system design, therefore, at least one search space (a set of control resources to be monitored) must be obtained from system information (e.g., via cell broadcast) or It is preferable to derive it implicitly from the information. This at least one search space then sends control messages that enable the UE to receive higher layer signaling (such as RRC) with the configuration of additional search spaces (control resource sets that may be monitored). used by the UE to receive.

One problem with having NR carriers that support multiplexing of different numerologies is that a single configuration of control resource sets for one numerology case may not work well for another configuration. . Furthermore, there is a general design objective of maintaining low signaling overhead and UE power consumption. As the number of control resource sets allocated to a UE increases, the amount of signaling related to control information also increases. This can also lead to congestion when the network is serving too many UEs and when many UEs share the same set of control resources. Furthermore, if multiple control resource sets are configured for the UE, the monitoring effort of the UE also increases, which may lead to an increase in the power consumption of the UE.

Furthermore, it should be considered how the configuration of control resource sets may enable frequency diversity for UEs with different bandwidth capabilities. Frequency diversity is very important to achieve reliable transmission of control information. The configuration of the control resource set should support frequency diversity. However, in NR carriers where UEs with different (bandwidth) capabilities are accommodated, a single configuration for control resource sets does not work well.

Thus, according to an embodiment, there are two sets of control resources for the UE;
A “first set of control resources” (Set 1) is obtained by the UE from a random access procedure;
A "second set of control resources" (Set 2) is configured by the base station after obtaining an indication of the UE capabilities.

Each set is associated with an RF bandwidth, with Set 1 implicitly indicating a first RF Bandwidth (BW) and a second RF BW along with Set 2 being configured by the base station. The first and second RF bandwidths are the bandwidths in which any resources that may be allocated by control messages carried in the corresponding first and second control resource sets are located. In other words, the first and second RF bandwidths are the operating bandwidths of the UE. Nevertheless, these RF BWs are recommended from the standpoint of the scheduler (eg, base station), suggesting that the resources scheduled by the DCI are limited within these RF BWs. The UE may set its RF operation BW according to this recommendation, but may also set it in another manner different from the recommendation, as long as the DCI and corresponding data transmissions can be received.

One reason why a UE is configured with multiple control resource sets is for power saving purposes. RF BWs associated with different controls may be different. In that case, the UE's operating RF bandwidth may be configured wisely. As a result, when a UE is idle or inactive, the UE may monitor a control resource set (e.g., set 1) that has an associated smaller RF operating bandwidth to save power consumption. may be instructed. When a UE is not inactive, it monitors a control resource set (e.g., set 2) that has a larger associated RF operating bandwidth to allow for larger allocations and thus higher data rates. may be instructed to do so.

The base station may be a gNB, which is the name currently used in 3GPP to refer to NR base stations. However, the present disclosure is not limited to NRs and, as a result, not limited to gNBs. Any other communication system may employ the configurations disclosed herein.

The first set of control resources may be a subset of the second set of control resources in the frequency domain. In other words, the bandwidth of the first set of control resources is included in the bandwidth of the second set of control resources. Additionally, the first set of control resources may be a subset of the second set of control resources in the time domain. In other words, the number of symbols (OFDM) of the first set of control resources may be less than or equal to the number of symbols of the second set of control resources. Therefore, the first set of control resources is still being used by the UE even after configuring the second set of control resources. However, the present disclosure is not limited to this example. This may be advantageous in some scenarios or systems where the UE stops monitoring the first set of resources after acquiring the second set of controlled resources.

As mentioned above, in order to allow UEs with different capabilities to access the first control resource set, reduce the power consumption of the UE, etc. width) may be narrower than the frequency range (bandwidth) of the second control resource set. Specifically, the frequency range of the first set of control resources may overlap or be completely included within the bandwidth of the second set of control resources.

According to an example configuration, control information common to two or more UEs is carried only by the overlapping portions of set 1 and set 2. In other words, the group common search space (CSS) is carried only in resources included in both the first control resource set and the second control resource set. In contrast, a user-specific search space (USS) may be carried by the remaining part of the second control resource set. This exemplary configuration is shown in FIG. The term UE-specific/group/common "search space" refers to the subset of specific/group/common control information to be monitored by blind decoding.

Specifically, FIG. 2 illustrates an example of the relationship between control resource sets and control information (DCI) types carried by them. Set 1 carries common control information that should be read by all UEs, possibly group control information that should be read by a specific group of UEs, and UE-specific control information that is addressed only to specific UEs. The portion of set 2 that does not overlap with set 1 carries only UE-specific control information and no common/group control information. Set 1 is part of Set 2. When the UE is instructed to only monitor set 2 for UE-specific DCI, there are more resources for DCI transmission (compared to the case in Figure 3), resulting in potentially greater diversity gain. becomes larger.

FIG. 3 shows another example of the relationship between the control resource set and DCI. Specifically, another exemplary configuration of Set 1 and Set 2 is shown. In this configuration, similar to the configuration of FIG. No information is conveyed. Set 1 and Set 2 are disjoint from each other (mutually exclusive) in this example. The monitoring effort is also reduced when the UE is instructed to monitor only set 2 for UE-specific DCI.

The examples described with reference to FIGS. 2 and 3 are merely illustrative; in general, set 1 and set 2 may be composed of overlapping resources. Furthermore, in the above example, all common search spaces and group search spaces, including common search spaces associated with all communication devices, are carried in set 1. However, the present disclosure is not limited to such a configuration. Specifically, one or more group search spaces may also be carried in set 2.

In LTE, a UE has two different RRC states: RRC_idle and RRC_connected.

In the idle state, the UE sleeps most of the time to save power, so no data transfer occurs. The UE wakes up periodically, for example to receive paging messages. In the connected state, there is an established RRC context, ie the parameters required for communication between the UE and the radio access network are known to both entities. The connection state is intended for data transfer to/from the terminal.

In NR, these two state designs are expected to persist, but additional new states, e.g. the inactive state, will be introduced to better trade-off between UE power savings and wake-up time. The necessity of doing so is being discussed. New state behaviors are still being defined.

In general, signaling traffic during idle and inactive states is considered to be lower than in connected states. Thus, in some example operations, the communication device monitors only Set 1 in an idle or inactive state, and otherwise monitors Set 2 and/or Set 1, for example, in a Connected state. may be configured. Additionally, when a communication device is in the connected state, it monitors only set 1 when traffic is low (e.g., below a certain threshold) and sets 1 when traffic exceeds a certain threshold. Set 2 may be configured to monitor Set 2 in addition to or instead of Set 1. Thus, the "power save" mode may include RRC_idle, RRC_connected, or possibly a new state.

FIG. 4 outlines an example UE procedure for obtaining the configuration of control resource sets 1 and 2 after power-up. Specifically, in step 410, a communications device (UE) is switched on.

At 420, the communication device performs synchronization tasks and reads system information. Specifically, step 420 may include operations similar to those performed by the UE after power-up in an LTE system. Such operations may include detecting a primary synchronization sequence (PSS) and a secondary synchronization sequence and performing frame and symbol synchronization accordingly.

Additionally, after synchronization, the communication device may read system information broadcast by the base station. In LTE, system information includes in particular a master information block (MIB) and a further system information block (SIB). The master information block consists of a limited number of the most frequently transmitted parameters necessary to carry out the first access to the cell. Although the detailed parameters in the MIB for NR are still being debated, they can be designed similarly to LTE, ie they can be reused to some extent. The first SIB, e.g. SIB1, then comprises a list of candidates for the first set of control resources, each candidate being associated with a particular set of random access channel resources (in LTE, physical random access channel (PRACH)). It will be done. The association of each candidate set with a unique set of random access channel resources is for the base station to identify a first set of control resources to transmit control information to a particular communication device based on the random access channel resources. The location provides the advantage that the base station is located. Furthermore, each candidate may be associated with further parameters such as numerology, operating bandwidth (first bandwidth), frequency location, etc.

The numerology and time-frequency resources for transmitting PSS/SSS/MIB may be defined in the standard so that all UEs can decode this information. The numerology for transmitting further SIBs (eg SIB1) to be read to implement random access may be the same as the MIB, or alternatively may be dictated by the MIB. The time-frequency resources for transmitting further SIBs (eg SIB1) are known to the UE from the MIB or alternatively defined in the standard. The reason for incorporating the configuration of set 1 into further SIBs (e.g., SIB1) is to avoid increasing the MIB size significantly, but still sets 1 to schedule the rest of the SIB as early as possible. It is possible to use it. However, the present disclosure is not limited to the configuration of Set 1 included in SIB1. The Set 1 configuration may be broadcast by the base station in any format or structure that allows the UE to receive and decode. For example, it may be included in the MIB. Furthermore, NR may apply a different structure than the MIB/SIB hierarchy used in LTE.

The above description is based on the LTE initial access procedure. However, the synchronization and system information acquisition procedures in NR may differ from those known in LTE. In any case, after power-up, the communication device synchronizes with the base station, at least to be able to read system information. The system information may include, for example, an indication of the resources on which further control (system) information is conveyed and/or a numerology of the control (system) information. For example, the system information may point to a first set of control resources or to a resource on which an indication of the first set of control resources is conveyed. In one example implementation, the system information indicates a plurality of candidate control resource sets, one of which the communication device may select to monitor. Selection of a first set of control resources from the candidate set is shown at step 430. The communication device may select one of the candidate sets similarly according to supported numerology and bandwidth capabilities. For example, there may be different candidate sets in the system information that are associated with different numerology and bandwidth capabilities and different random access channel resources. To initiate a random access procedure, the communication device transmits a preamble using a pseudo-random sequence and uplink resources associated with the selected set.

At step 440, a random access procedure is performed. A random access procedure may also be employed to inform the base station of the selected first set of control resources in step 430. Specifically, during a random access procedure, the communication device transmits a random access message using resources associated with the selected control resource set. For example, such association may be provided by associating a particular set of control resources with respective random access signatures, one of which the communication device selects for inclusion in the random access preamble.

At step 450, a radio resource control (RRC) connection is established after a successful random access procedure. In other words, a signaling bearer is established to facilitate further control information exchange between the communication device and the base station. Specifically, the base station may transmit the UE-specific DCI in set 1, including scheduling information for RRC signaling in the downlink, to configure the UE.

At step 460, the communication device informs the base station of its capabilities. UE capabilities may include, for example, operational bandwidth capabilities and/or use cases.

After informing the base station of its capabilities, the communication device continues to monitor the first set of control resources for control information at step 470. In response to receiving the notification of the UE capabilities, the base station may send a configuration of a second set of control resources to be monitored within the first set of control resources to the communication device. For example, the gNB determines the configuration of set 2 according to the UE numerology and the second RF bandwidth, bandwidth capabilities, and network conditions, and the RRC reconfiguration scheduled by the DCI carried in the first set of control resources. The message signals the configuration to the UE.

The communication device receives the configuration of the second set of controlled resources, and upon receiving the configuration begins monitoring the second set of controlled resources in step 480. As explained above, in some examples the communication device also continues to monitor the first set of controlled resources, while in other examples only the second set of controlled resources is monitored.

FIG. 5 shows an example of a first control resource set and a first operating RF bandwidth (also referred to as a first bandwidth) for a UE in a network, where the bandwidth of set 1 is the first equal to the UE operating RF bandwidth of Specifically, FIG. 5 shows an OFDM grid, the vertical dimensions of which are given by the system bandwidth (SYS BW) extending on either side of the center frequency of the NR carrier, and the horizontal dimensions of which each slot has seven OFDM Given by an exemplary two slot (1 ms) subframe with symbols. As explained above, set 1 is used to carry both (group) common control information and UE-specific control information before the transfer of UE capabilities. Furthermore, Set 1 only has control resources located within a first bandwidth (UE1's first RF BW), which is a subset of the system bandwidth. Moreover, as can be seen from FIG. 5, the first control resource set is only located within some OFDM symbols. Specifically, in this example, the first set of control resources is located within the first two OFDM symbols of each slot. However, the present disclosure is not limited to such configurations, and in general, the first control resource set may be defined on any subset of system bandwidth and (sub)frames. In this case the symbols are OFDM symbols. However, the present disclosure is not limited to OFDM. Any other time-frequency system may be used as well, such as SC-FDMA. In general, more than just time-frequency radio resources may be configured.

In other words, after decoding the initial system information (e.g. SIB1) necessary to perform random access, the UE selects one entry (ENTRY) from the list of first control resource set candidates; Returns its center frequency (ie, the center frequency of the UE1 receiver in FIG. 5). The UE's first RF BW may be set to the minimum requirement of this list entry, ie, the minimum bandwidth configuration associated with the selected candidate set. In other words, the entry may define a range of RB BWs to be supported, outside of which the UE may be configured to apply the minimum requirements.

FIG. 6 shows an example of a second set of controlled resources and a second operating RF bandwidth for a UE in a network, where the bandwidth of set 2 is less than the second UE operating RF bandwidth. . Specifically, FIG. 6 shows the same OFDM resource grid as shown in FIG. Given. A second set of control resources is located within a second bandwidth. The second bandwidth (denoted in the figure as UE1's second RB BW) is a subset of the system bandwidth, ie, the second bandwidth is less than or equal to the system bandwidth. In FIG. 6, the second control resource set is defined only in a subset of OFDM symbols (the first three symbols in each slot) in the time domain.

As mentioned above, generally the second bandwidth may overlap the first bandwidth. However, the present disclosure is not limited to such a configuration, and the first bandwidth and the second bandwidth may not overlap. A special example is shown in FIG. 7 where the first bandwidth forms part of the second bandwidth. Specifically, FIG. 7 shows the same OFDM grid as FIGS. 5 and 6, but now the first bandwidth (UE1's first RF BW) is different from the second bandwidth (UE1's second RF BW). RF BW). In this example, the center frequency of both the first and second bandwidths is the same (the center frequency of the UE1 receiver). As can be seen from FIG. 7, in this example, the first set of control resources is also completely contained within (and overlaps with) the second set of control resources.

In other words, after the UE capability transfer, the gNB is ready to configure a second set of control resources and a second bandwidth for the UE. According to FIG. 7, the first and second bandwidths of the UE are centered, ie, the center frequency of the first bandwidth is the same as the center frequency of the second bandwidth. This alignment has the advantage that there is no need for retuning when the UE switches between set 1 and set 2 monitoring, resulting in a shorter transition time required between the two sets of monitoring. . Furthermore, since there is no need to indicate the center of bandwidth, the message size for configuring the second control resource set may also be reduced.

FIG. 8 shows another example of Set 1 and Set 2, where Set 1 and Set 2 are non-overlapping and Set 2 includes only UE-specific DCI. A connected UE may be configured to monitor both Set 1 and Set 2. Specifically, FIG. 8 shows another example where the first bandwidth and the second bandwidth are not centered with respect to each other. In this example, the first bandwidth and the second bandwidth still completely overlap, but the first bandwidth forms part of the second bandwidth. However, the first set of control resources is not a subset of the second set of control resources.

FIG. 9 shows an example of a configuration in which the first bandwidth is part of the second bandwidth. However, the first control resource set and the second control resource set are separate from each other and discontinuous. In other words, set 1 and set 2 are non-contiguous, with set 2 containing only UE-specific DCI. A connected UE may be configured to monitor both Set 1 and Set 2. This increases the flexibility for the gNB to configure the control resource set. However, in FIG. 9, in order to consider separate parts from each other, and in particular to allow the UE to monitor both set 1 and set 2, the second UE operation BW is shown in FIGS. 7 and 8. much larger than.

Either (or both) Set 1 and Set 2 in any of the examples shown above may be shared by multiple UEs.

All the examples described with reference to Figures 5 to 9 show continuous UE operation BW (first and second UE operation BW), i.e. the RF BW is formed by N consecutive subcarriers. be done. For UEs with relatively high bandwidth capabilities, frequency diversity is applied to distributed physical resource blocks (PRBs) within the frequency domain within one control resource set and still within the bandwidth supported by the UE. This can be achieved by mapping control channels. Using such dispersion mapping in the frequency domain improves frequency diversity. A physical resource block is a scheduling unit each having a size of multiple subcarriers and multiple symbols.

Frequency hopping, where the control resource set and associated RF BW consists of non-contiguous frequency portions, and the UE's reception window hops between those portions (i.e., one portion at a time), increases frequency diversity. Further improvements can be achieved. This may result in desirable frequency diversity improvements, especially for UEs with low bandwidth capabilities, eg, UEs in mMTC. For such narrowband UEs, frequency diversity may otherwise be difficult to achieve.

An example of such hopping is shown in FIG. In this configuration, the communication device follows a hopping pattern defined for the control resource set. The term "hopping pattern" herein refers to the location of a control resource set instance in a time-frequency grid. Specifically, for frequency hopping, the hopping pattern indicates the change in frequency location of the control resource set instance over time.

Between different patterns, the UE may need to perform retuning. Therefore, it may be desirable to skip one or more OFDM symbols, ie, not assign these symbols to the control resource set pattern, to provide transition time for retuning. Specifically, FIG. 10 shows the system bandwidth (SYS BW) and hopping between the two patterns and the corresponding two respective subbands. The first frequency portion 1010 includes a first instance 1015 of a first set of controlled resources, and the second frequency portion 1020 includes a second instance 1025 of the first set of controlled resources. As can be seen, the first instance is separated from the second instance in the time domain by one OFDM symbol (seventh symbol) that does not carry the first set of control resources. If this pattern of first and second instances is repeated for each slot, there can also be one null OFDM symbol between the second instance and the subsequent repeated first instance. I understand. The term "null" means that the OFDM symbol does not carry any data (control or payload).

In this example, the length of the timeslot is 14 OFDM symbols. Hopping is performed between two instances every seven OFDM, but the length of one instance is 6 OFDM symbols.

This disclosure is not limited to any particular number of OFDM symbols per slot or per subframe, nor is it limited to any particular number of slots per subframe. In general, hopping may occur every K symbols or every arbitrary unit of time. To facilitate a less complex UE implementation, it may be advantageous if the length of the instance of the control resource set is less than or equal to the length of K symbols.

FIG. 11 shows the relationship between set 1 and set 2 with hopping, where set 1 is a subset of set 2. In this example, set 1 and set 2 have the same hopping interval, and the switching between the two instances in each of the two different bandwidths is performed every 7 OFDM symbols. In this example, group common messages/control information (DCI) are sent in the overlap between set 1 and set 2. The first bandwidth and the second bandwidth are not centrally located. A hopping pattern generally specifies the variation in operating bandwidth over time units. The above example only shows hopping between two instances. However, the present disclosure is not limited thereto, and longer series of instances in which the bandwidth is switched may be defined. For example, the hopping pattern may also be defined over multiple subframes or slots, unlike the example above.

However, set 1 and set 2 do not necessarily have to have the same hopping pattern. The advantage of having the same hopping pattern for the two sets is that the monitoring effort for the communications device (UE) is reduced.

As mentioned above, the control resource set configuration may include a variety of different parameters whose values may be optimized for different use cases, such as eMBB or URLLC. Specifically, the communication device receives system information from a base station, such as system information necessary to implement a random access procedure, the system information including a first control resource set of different respective configurations. Contains a list of entries.

For example, an entry may have the following parameters for the first control resource set candidate.
- subcarrier spacing (SCS), which defines the spacing in the frequency domain between two consecutive subcarriers;
- set bandwidth (BW) that defines the bandwidth of the control resource set;
- the frequency location of the control resource set that defines the center frequency of the control resource set - the PRB (Physical Resource Block) index (instead of signaling the center frequency and width, the BW of the set and its frequency location make up the set) (may be indicated by PRB (Physical Resource Block) index)
- the first RF BW (operating bandwidth, i.e. the bandwidth in which any resource schedulable by the control information carried by the set is located, may be assumed to be equal to the BW of the set; such (If the bandwidth of the set is different from the operating bandwidth, then another parameter may be included)
- Physical Random Access Channel (PRACH) resources (including preamble sequence and PRACH time-frequency resources)

An example list of candidate control resource sets may have, for example, the following entries:
- Entry 1: SCS = 15 kHz, setting BW = 5 MHz, setting center frequency, PRACH time-frequency resource, preamble sequence - Entry 2: SCS = 60 kHz, setting BW = 20 MHz, setting center frequency, PRACH time-frequency resource, preamble sequence

In other words, entry 1 has a carrier spacing of 15 kHz and the bandwidth of the set is 5 MHz, which is assumed here to be the same as the operating bandwidth (similar to the example shown in FIG. 5). The center frequency indicates the location of the band within the system bandwidth. A PRACH resource may include the location of the corresponding PRACH resource in the grid and a preamble sequence that may be used with this set.

For example, entry 1 may be selected by the eMBB UE, while entry 2 may be selected by the URLLC UE. In general, if a UE supports multiple services and/or newerologies, the UE may randomly select one of the entries that matches one of the newerologies. Alternatively, there may be a predefined default numerology based on which the UE selects the entry.

As another alternative, a UE may select an entry based on its UE ID. For example, entries may be selected applying the following example rules.
selected_entry_index=UE_ID mod number_of_numerologies_it_supports
where mod is the modulo operation, selected_entry_index is the selection result (specifying the index of the entry among the selectable entries in the set), and number_of_numerologies_it_supports is the number of numerologies supported by the UE with UE_ID. be.

As yet another alternative, the UE may select an entry based on its channel conditions. For example, if the channel is good, select a PRACH with low diversity, otherwise select a PRACH resource with high diversity (high repetition level occupying more uplink time-frequency resources).

The selection of entries in the control resource set candidate list provides the advantage of associating the random access procedure with a specific numerology and bandwidth, so that no explicit signaling is required between the communication device and the base station. Rather, by implementing a random access procedure, the base station is implicitly informed of a selected set of control resources that can be monitored by and used by the base station to transmit control information to the communication device. Ru.

The same configuration parameters for the above example of set 1 may also be used for set 2. However, if the entries in the second set are configured with only a subset of the parameters of the configuration in the first set, and the remaining parameters are assumed to be the same as in the first set, then the signaling overhead for system information is It can be further reduced. For example, set 2 may be configured only with a second bandwidth. The remaining parameters may be considered the same as for set 1 previously selected by the UE.

An example of a configuration parameter list for set 2 may be as follows.
- Set 2 BW that defines the bandwidth of control resource set 2
- a second RF BW (second bandwidth) that defines the frequency resources to which the scheduling grant in DCI is applied;
- No PRACH resources required for set 2

In the example set 2 configuration above, set 1 and set 2 are centered in the frequency domain (as shown in Figure 7), so that no explicit signaling is needed to indicate the location of set 2. . However, the present disclosure is not limited thereto, and Set 2 may be configurable with other parameters of Set 2 bandwidth.

In some of the above examples, the first control resource set carries both (group) common DCI and UE-specific DCI. Therefore, serving too many terminals can cause congestion. In other words, it may be difficult to receive user-specific DCI if there are a large number of UEs to be provided with DCI. This can be particularly problematic when multiple UEs select the same control resource. Additional selection criteria apart from the numerology may be applied to reduce the possibility of congestion.

Another example of an entry in the list of candidate sets could be:
- Entry 1: SCS = 15 kHz, setting BW = 5 MHz, 5 MHz <= UE capability <= 20 MHz (selection criteria), setting center frequency, preamble sequence, PRACH time-frequency resource - Entry 2: SCS = 15 kHz, setting BW = 5 MHz, 20 MHz <= UE capability <= 80 MHz (selection criteria), setting center frequency, preamble sequence, PRACH time-frequency resource - Entry 3: SCS = 60 kHz, setting BW = 20 MHz, 20 MHz <= UE capability <= 80 MHz ( selection criteria), configuration center frequency, preamble sequence, PRACH time-frequency resources

For example, entry 1 is characterized by a 15 kHz SCS and the set bandwidth is 5 MHz, which is assumed here to be the same as the operating bandwidth. Further, the UE bandwidth capability is with a UE capability bandwidth range of 5 MHz to 20 MHz. The remaining parameters are similar to the example above.

The communication device then selects one set according to both its numerology and selection criteria. For example, in the list above, both Entry 1 and Entry 2 have the same subcarrier spacing and bandwidth, so both are suitable and targeted for the same use case, such as eMBB operation. However, they differ with respect to the UE capabilities, which is an additional selection criterion here. Specifically, entry 1 is for a UE with a bandwidth capability of 5 MHz to 20 MHz, whereas entry 2 is for a UE with a bandwidth capability of 20 MHz to 80 MHz. Thus, a UE with a bandwidth capability of 20 MHz to 80 MHz (such as 40 MHz) may select entry 2, whereas a UE with a bandwidth capability of less than 20 MHz (such as 10 MHz) may select entry 1. Entry 3 is suitable for and targeted at the URLLC use case, for example.

Specifically, the communication device may set the first operating bandwidth to the minimum requirement of the UE capability for the same numerology. According to the exemplary list of entries 1-3 shown above, if the UE supporting 15kHz SCS has a bandwidth capability of 80MHz, entry 2 would be selected and the first RF UE The operating BW may be set to 20 MHz (corresponding to the minimum requirement of the selection criteria in entry 2, in other words corresponds to the minimum value of the UE capability range parameter). The advantage of such a configuration is that the gNB (or scheduler) knows that all UEs monitoring the set in Entry 2 have at least 20MHz BW capability, so the DCI carried by this set is It is possible to schedule resources matching this 20 MHz without worrying about detection failure. On the other hand, selecting a 20 MHz operating BW for a UE with 80 MHz capability will save monitoring power consumption.

In the above example, entry 3 is the only entry for the numerology with SCS=60kHz. However, the present disclosure is not limited thereto. In general, there may also be one or more additional entries with the same SCS and BW and additional selection parameters of different values.

If the set BW is smaller than the UE's first RF operation BW (first bandwidth), then:
- The control resource set may be centrally located inside the first bandwidth in the frequency domain, so that no signaling for the center frequency is required. The size relationship between the BW of the control resource set and the first BW may be defined in a standard or may be signaled.
- Alternatively, the offset between the center of the set and the center of the first bandwidth may also be incorporated as one parameter.
- Alternatively, the UE may perform blind decoding within the first bandwidth.

Therefore, congestion problems may be reduced by appropriately grouping communication devices according to additional selection criteria. One possible selection criterion is the UE capability range in terms of bandwidth, as mentioned in the example above. With such selection criteria, the range of UE bandwidth capabilities is implicitly known to the gNB during the random access procedure. Accordingly, the gNB may provide the DCI with a resource allocation within the first control resource set, but that resource allocation matches the UE's capabilities, i.e., resources located within the bandwidth included in the UE's capabilities. (e.g., minimum UE capability range value). The above example only shows two different UE capability ranges. However, in general there may be more than two such capability ranges used as selection criteria.

Entries in the list of candidate sets may also include additional parameters indicating whether hopping is enabled or disabled, and possibly also signaling the hopping pattern. An example of such a list is shown below.

- Entry 1: SCS = 15kHz, configuration BW = 5MHz, 5MHz <= UE capability <= 20MHz (selection criteria), configuration center frequency, hopping = false, PRACH sequence, PRACH time-frequency resource - Entry 2: SCS = 15kHz , Setting BW = 5 MHz, 20 MHz <= UE capability <= 80 MHz (selection criteria), Setting center frequency, Hopping = False, PRACH sequence, PRACH time-frequency resource - Entry 3: SCS = 60 kHz, Setting BW = 20 MHz, 20 MHz <= UE capability <= 80 MHz (selection criteria), configured center frequency, hopping = false, PRACH sequence, PRACH time-frequency resource - Entry 4: SCS = 15 kHz, configured BW = 180 MHz, 1.4 MHz ≤ UE capability < = 5MHz (selection criteria), center frequency of configuration, hopping = true, hopping pattern, PRACH sequence, PRACH time-frequency resource

Therefore, there are different hopping options for each different entry in the list. Hopping can be switched on (in this example, hopping = true value) or off (in this example, hopping = false value). If hopping is true, a predefined or preconfigured hopping pattern may be applied.

In the example above, entries 1 and 2 may be appropriate for the eMBB use case, while entry 3 may be appropriate for the URLLC use case. Entries 1-3 have hopping turned off. Additionally, for entry 4, which has the lowest bandwidth, hopping is turned on and an additional parameter hopping pattern is configured. A parameter called hopping pattern indicates a hopping pattern. This may be implemented by reference to one of a number of specific patterns that may be defined in a standard or configured by system information. Entry 4 can be particularly efficient for low bandwidth use cases, such as mmTC, since it allows the provision of frequency diversity even for UEs with very low BW capabilities. It is.

Also, there may be multiple different entries in the hopping pattern that may be specified as additional parameters.

The above list of entries is merely exemplary. Lists with more entries can be provided with different parameter combinations. Providing greater freedom of choice may help reduce the likelihood of congestion.

In order to obtain greater freedom for configuration, other parameters in the basic parameters mentioned above may also be configured for the second set of control resources.

The following first and second sets of control resources may be defined for the first eMBB UE.
- Set 1: SCS = 15kHz, configuration BW = 5MHz, 5MHz <= UE capability <= 20MHz (selection criteria), configuration center frequency, hopping = false, PRACH sequence, PRACH time-frequency resource - Set 2: SCS=15kHz, set BW=20MHz, 2nd RF BW=20MHz, set center frequency, hopping=false

Specifically, in this example, set 1 has a configuration BW that is assumed to be the same as the first bandwidth, and set 2 is configured to separate the configuration of the set bandwidth and the second bandwidth. It makes it possible. Furthermore, set 2 may be located at a different center frequency than set 1. However, in the above entry for set 2, the operating (second RF BW) bandwidth is still set to be the same as the configuration bandwidth.

The following first and second control resource sets may be defined for the second eMBB UE.

Set 1: SCS = 15kHz, configuration BW = 5MHz, 20MHz <= UE capability <= 80MHz (selection criteria), configuration center frequency, hopping = false, PRACH sequence, PRACH time-frequency resource Set 2: SCS = 15kHz, configuration BW=40MHz, 2nd RF BW=40MHz, center frequency of settings, hopping=false

Furthermore, for possible URLLC UEs, two sets may be defined as follows.
- Set 1: SCS = 60kHz, configuration BW = 20MHz, 20MHz <= UE capability <= 80MHz (selection criteria), configuration center frequency, hopping = false, PRACH sequence, PRACH time-frequency resource - Set 2: SCS = 60kHz , set BW = 40 MHz, second RF BW = 80 MHz, center frequency of set, offset between center of set BW and center of second BW, hopping = false

In the above entry for set 2, the set bandwidth is narrower than the second bandwidth and an offset is defined.

For a possible mmTC UE, two sets may be defined as follows.
- Set 1: SCS = 15kHz, configuration BW = 180MHz, 1.4MHz <= UE capability <= 5MHz (selection criteria), hopping = true, hopping pattern, PRACH sequence, PRACH time-frequency resource - Set 2: SCS=15kHz, Setting BW=360kHz, 2nd RF BW=1.4MHz, Hopping=True, Hopping pattern

Specifically, in this example, the center frequencies of set 1 and set 2 are not provided in the configuration parameters. The default location will be used in this case. For example, the control resource set is always located at the edge of the system bandwidth, as in the examples shown in FIGS. 10 and 11.

In the above example, the focus is on the configuration of control resource sets in the frequency domain. However, it may also be useful to consider the location of the control resource set in the time domain.

FIG. 12 shows an example alignment of various time units within a subframe. A subframe is a time unit having a length of 1 ms in this example. However, the 1 ms subframe length is just an example, and the present disclosure is not limited to any particular time unit length. Subframes are further divided into slots or minislots. To support multiple numerologies, each numerology may have its own scheduling interval in units of slot or minislot lengths. As can be seen from FIG. 12, the scheduling intervals such as slots and minislots for different numerologies are aligned within the subframe boundaries. Further, FIG. 12 shows the following scheduling interval lengths.

- Two 0.5 ms long slots within a subframe. This configuration corresponds to a 15kHz SCS with 7 symbols per TTI (scheduling interval).
- 7 mini-slots in the subframe. This configuration corresponds to 15kHz SCS and 2 symbols per TTI.
- 16 minislots in the subframe. This configuration corresponds to a 30kHz SCS and 2 symbols per minislot.
- 8 slots within a subframe. This configuration corresponds to 60kHz and 7 symbols per TTI.

FIG. 17 shows an exemplary numerology scheme. Specifically, FIG. 17 is a simplified diagram of the partitioning of radio resources according to three different numerology schemes. The resulting resource scheduling unit is shown as a bold rectangle in each of the numerology schemes.

Numerology scheme 1 of FIG. 17 is characterized by having a subcarrier spacing of 15 kHz (with a resulting symbol duration of 66.7 μs (see FIG. 1)), 12 subcarriers and 6 symbols per resource scheduling unit. . The resulting resource scheduling units have a frequency bandwidth of 180 kHz and a length of 0.5 ms (if we exemplarily consider cyclic prefixes of 16.7 μs each, as known from e.g. LTE systems). . Correspondingly, in the frequency domain, the bandwidth of the frequency band is divided into 24 resource scheduling units, each with a bandwidth of 180 kHz. Using these numerology characteristics, numerology scheme 1 can be considered for data transmission of mmTC services. Therefore, a UE following that numerology scheme can theoretically be scheduled by the scheduler every TTI, ie every 0.5ms.

Numerology scheme 2 has a subcarrier spacing of (2 x 15 kHz =) 30 kHz (resulting symbol duration is 33.3 μs (see Figure 1)), 12 subcarriers and 6 symbols per resource scheduling unit. It is characterized by The resulting resource scheduling unit thus has a frequency bandwidth of 360 kHz and a length of 0.25 ms (if we consider exemplary scaled cyclic prefixes of every 2 16.7 μs). Correspondingly, in the frequency domain, the bandwidth of the frequency band is divided into 12 resource scheduling units, each with a bandwidth of 360 kHz. Using these numerology characteristics, numerology scheme 2 can be considered for data transmission of eMBB services. A UE that follows its numerology scheme can therefore theoretically be scheduled by the scheduler every TTI, ie every 0.25ms.

Numerology scheme 3 has a subcarrier spacing of (4 x 15 kHz =) 60 kHz (resulting symbol duration is 16.7 μs (see Figure 1)), 12 subcarriers and 4 symbols per resource scheduling unit. It is characterized by Therefore, the resulting resource scheduling unit has a frequency bandwidth of 720 kHz and a length of 0.0833 ms (if we exemplarily consider a scaled cyclic prefix of every 4 16.7 μs). Correspondingly, in the frequency domain, the bandwidth of the frequency band is divided into 6 resource scheduling units, each with a bandwidth of 720 kHz. Using these numerology characteristics, numerology scheme 3 can be considered for data transmission of URLLC services. Therefore, a UE following that numerology scheme can theoretically be scheduled by the scheduler every TTI, ie every 0.0833ms.

Different numerology schemes must coexist in a mobile network, and radio resources of different numerology schemes should be available to be allocated to user terminals as needed. There are several possibilities regarding different numerologies within the frequency band and how to multiplex radio resources in the frequency domain and/or time domain. In general, the available time-frequency radio resources of a frequency band are allocated in a suitable manner to the different numerology schemes coexisting in the system, so that it is possible to allocate radio resources for data transmission according to each numerology scheme. Should be divided between. Correspondingly, each newerology scheme is associated with a particular set of radio resources from among the available radio resources of a frequency band, which sets of radio resources are then allocated according to that newerology scheme, i.e. , can be used by a scheduler (e.g., a radio base station) to allocate radio resources for transmitting data for the corresponding service (here URLLC, mmTC, mmBB) according to the newerological characteristics of a particular newerological scheme. . This multiplexing of different coexisting numerology schemes for services can also be flexible, considering that the amount of traffic for each service varies over time.

The communication device then monitors the control resources at most every scheduling interval. To reduce monitoring effort, greater power savings may be obtained as monitoring occurs less frequently.

The UE may be configured with RRC, or more generally with higher layer protocols, in which slots/minislots DCI is expected within one subframe. Its configuration may depend on the DCI type (eg, RA-RNTI, SI-RNTI, UE-specific DCI, etc.). For example, a first slot within a subframe may be configured to carry common control information, whereas a second slot within the same subframe may be configured to carry UE-specific control information and a common It may be configured not to carry control information. Additionally, the slot carrying group information may be designated separately from the first and second slots, or may be the same. Such subdivision also allows for reduced monitoring effort, since an attempt to decode control information using a particular type of RNTI (or RNTIs) may be made on only one slot. .

The size in the time domain of the first set of control resources and the second set of control resources may be determined implicitly by the communication device based on another configurable parameter or by explicit signaling at the base station. It may be configured by Specifically, the number of symbols of a control resource set within a scheduling interval may be a fixed value depending on the length of a slot/minislot. In other words, the communication device determines the number of symbols of the control resource set based on the slot size (or scheduling interval size). The determination scheme may be given in the standard, for example, as a table of the number of symbols of the control resource set for a particular configurable slot size and/or scheduling interval size.

Alternatively, the size of the resource control set is configurable. Specifically, the size of the (first or second) resource control set is signaled in the first symbol of the (first and second respectively) resource control set, i.e. on the Physical Control Format Indicator Channel (PCFICH). can be done. However, this disclosure is not limited to such signaling. Alternatively, the size of the resource control set in the time domain is a parameter of the respective resource control set and is selected by the communication device using a random procedure as indicated above with respect to the numerology and/or operating bandwidth range. can be directed by.

Additionally, the configurability of the size of the resource control set in the time domain may be configurable. For example, the parameter "PCFICH Configuration Possibility" may be included among the configuration parameters for Set 1 and Set 2. If the value of the parameter "PCFICH configuration possibility" is false, a fixed value is used for the number of symbols in set 1 and/or set 2, respectively. This fixed value is either a default value or a value determined by the communication device as described above. On the other hand, if the value of the parameter "PCFICH configuration possibility" is true, the number of symbols is signaled by the PCFICH located in the first symbol of the control set.

A communication device may utilize different sets of control resources in a variety of ways. For example, according to the first option (option 1), different sets are configured for different numerologies. The UE should perform blind decoding within all configured control resource sets. Specifically, the base station monitors one or more configured sets of control resources, such as a first set of control resources and a second set of control resources and/or another set of control resources, such as a third, fourth, etc. The communication device may be controlled to: For example, there may be a set of control resources transmitted based on a newerology similar to the newerology of the resources scheduled by the control information (DCI) carried in that set. Nevertheless, the monitoring effort increases with each new set that is monitored.

To further reduce the monitoring effort, according to option 2, one set is configured to carry the DCI for other numerological data transmissions. In other words, the numerology of a control resource set may be different from the numerology of the resources scheduled by the control resources of that control resource set. One of the advantages of this approach is that the UE only needs to monitor one numerology scheme for control information. Control information (DCI) may then similarly indicate the numerology used by data transmissions assigned (scheduled) by that DCI.

The frequency resources and associated RF BWs of the control resource set may be indicated by their absolute values or by an index assigned to a particular value, for example in a standard. Alternatively, in order to provide sufficient flexibility of the signaling and at the same time save signaling resources, the frequency resources of the (first and/or second) control resource set may be It may be indicated based on a resource grid in the same numerology scheme.

For example, a resource grid is defined for each numerology scheme and known to both the gNB and the UE. The grid does not change with respect to resource allocation. This situation is shown in FIG. Specifically, FIG. 13 shows three respective grids for three different numerologies as three rows, with subcarrier spacings of 60 kHz, 30 kHz, and 15 kHz. UE1 in FIG. 13 may be notified of the first RF BW as {RB#-13 to RB#-10} by the 15kHz SCS. In other words, the first bandwidth and/or the second bandwidth may be indicated by the index of the lowest resource block (RB) and the index of the highest resource block belonging to the respective bandwidth. A resource block may be the smallest assignable unit in the frequency domain and may include a number of subcarriers, for example 12 subcarriers.

Accordingly, control information (e.g., higher layer signaling such as dedicated RRC signaling or broadcasted system information, and physical layer signaling) conveying the control resource set may be signaled with improved efficiency.

However, this disclosure is not limited to such signaling. Generally, the operating bandwidth may be signaled by its center frequency and width, or in any other manner, such as minimum RB and bandwidth.

Additionally, the signaling described above may be used to indicate any subband of the system band by lowest and highest frequency (indicated by the resource block index). In other words, this signaling scheme is not limited to signaling operating bandwidth, but may indicate any frequency band or range (e.g., the capability bandwidth ranges discussed above in connection with candidate set configuration). can be used to

The present disclosure may be implemented by software, hardware, or software cooperating with hardware. Each of the functional blocks used in the description of each embodiment described above can be realized partially or completely by an LSI such as an integrated circuit, and each process described in each embodiment can be realized by the same LSI. Or it can be partially or completely controlled by a combination of LSIs. LSIs may be formed individually as chips, or one chip may include some or all of the functional blocks. The LSI may include a data input section and a data output section coupled thereto. The LSI here can be called an IC, system LSI, super LSI, or ultra LSI depending on the degree of integration. However, techniques for implementing integrated circuits are not limited to LSIs, but may be implemented using dedicated circuits or general purpose or special purpose processors. In addition, an FPGA (field programmable gate array) that can be programmed after the LSI is manufactured or a reconfigurable processor that can reconfigure the connections and settings of circuit cells arranged inside the LSI may be used. The present disclosure may be implemented as digital or analog processing. If future integrated circuit technology replaces LSI as a result of advances in semiconductor technology or other derivative technologies, the functional blocks may be integrated using that future integrated circuit technology. Biotechnology can also be applied.

FIG. 14 shows a block diagram of a system that includes a communication device 1410 and a scheduling device 1460 that communicate with each other via a (wireless) physical channel 1450. Communication device 1410 includes transceiver 1420 and circuitry 1430. Transceiver 1420 includes a receiver and a transmitter. Circuit 1430 may be one or more hardware, such as one or more processors or any of the LSIs described above. Between the transceiver 1420 and the circuit 1430 there is an input/output point 1425 through which the circuit controls the transceiver 1420 in operation, i.e. controls the receiver and/or the transmitter. and exchange received/transmitted data. Transceiver 1420 may include an RF front including one or more antennas, an amplifier, an RF modulator/demodulator, and the like. Circuitry 1430 specifically controls transceiver 1420 for transmitting user data, controlling data provided by the circuitry, and/or receiving user data and control data for further processing by the circuitry. may implement control tasks such as

A simple and exemplary scenario is shown in FIG. 15 using a radio base station and several user terminals. Each of the three UEs shown supports different services, namely mmTC, eMBB, and URLLC services, which were already introduced in the background section. As shown, one UE shall support and be configured for two different services, typically URLLC and eMBB services.

The wireless base station in FIG. 15 may correspond to base station 1460 in FIG. 14. Any of the three UEs of FIG. 15 may correspond to communication device 1410 of FIG. 14.

According to one embodiment, a communication device 1410 is provided and comprises a receiver 1420 capable of receiving control signals from a base station 1460 on a first set of control resources and a second set of control resources. Communication device 1410 further includes a transmitter 1420 capable of transmitting control signals and data, and circuitry 1430, which in operation:
- controlling a transmitter to transmit a random access message associated with the first set of control resources and to transmit a communication device capability indication;
- a receiver configured to monitor the control resources in the first set of control resources after transmitting the random access message and to receive an indication of the configuration of the second set of control resources in the first set of control resources; control,
- controlling the receiver to monitor the control resources in the first set of control resources and/or the second set of control resources after receiving the configuration of the second set of control resources;

The indication of the configuration of the second set of control resources may be, for example, a resource allocation of upper layer signaling conveying the configuration of the second set of control resources for the communication device. However, the present disclosure is not limited to this example. For example, the indication may also directly reference the second set of control resources.

A first set of control resources is located within a first bandwidth and a second set of control resources is located within a second bandwidth. Here, the first bandwidth is the bandwidth in which any resource allocated by the control information carried in the first set of control resources is located, and the second bandwidth is the bandwidth in which any resource allocated by the control information carried in the first set of control resources is located. The bandwidth in which any resources allocated by the control information carried in the second set are located.

The first bandwidth and the second bandwidth may be the same. In other words, assignments received within the first resource set may span the same operating bandwidth as assignments received within the second resource set. However, if the first bandwidth is a subset of the second bandwidth, monitoring effort and power consumption may be reduced.

In one example, the first bandwidth and the second bandwidth are centered on each other in the frequency domain. Similarly, the bandwidths of each of the first and second sets of control resources may also be centered with respect to each other.

Regarding the relationship between the two sets, in one example, the bandwidth of the first set of control resources is included in the bandwidth of the second set of control resources. Furthermore, the first set of control resources may be a subset of the second set of control resources. For example, if the resources are defined in a time-frequency grid of number of symbols in time and number of subcarriers in frequency, then in addition, the symbols carrying the first set of control resources carry the second set. It may also be included in the symbol being conveyed. However, the present disclosure is not limited by the relationship between Set 1 and Set 2 in the time domain.

According to another example, the first set of control resources and the second set of control resources are separated from each other in the frequency domain or only partially overlap.

The bandwidth of the first control resource set is equal to or less than the first bandwidth. Similarly, the bandwidth of the second set of control resources is equal to or less than the second bandwidth.

In any of the above examples, the first set of control resources advantageously includes common control information to be decoded by multiple communication devices, as well as user-specific control information to be decoded only by a particular communication device. and the second set of control resources includes user-specific control information.

The second set of control resources may also include (group) common control information, but this is especially true when set 1 is a subset of set 2. On the other hand, if set 1 and set 2 are separate from each other (or partially overlap), set 2 need not contain any (group) common control information.

In operation, the circuit may control the receiver to monitor the first set of control resources when the communication device is in an operating mode that promotes power savings.

A mode that promotes power savings may be, for example, a mode in which the communication device has no active data connections or only low activity (eg, below a certain traffic threshold) data connections. For example, a mode that promotes power saving may correspond to an idle mode defined in LTE (no data bearer is established).

Additionally, the circuitry may, in operation, control the receiver to monitor the second set of control resources when the communication device is not in an operating mode that promotes power savings. In addition to monitoring the second set, the receiver may also be controlled to still monitor the first set.

Alternatively, the circuit is configured, in operation, to monitor a first set of control resources when communication device traffic does not exceed a threshold and a second set of control resources when communication device traffic exceeds a threshold. The receiver may be configured to control the receiver to monitor the set. The threshold may be configured by the base station and provided to the communication device via upper layer signaling. Alternatively, it may be specified by a standard. Alternatively, the threshold may be used only by the base station, which directs communications according to the threshold whether the first set of controlled resources or the second set of controlled resources is to be monitored.

To further improve frequency diversity, the first set of control resources is distributed in the frequency domain, and the circuit, in operation, frequency hops every first predetermined time interval to monitor the first set of control resources. control the receiver to carry out the

In one example, the second set of control resources is distributed in the frequency domain, and the circuit is configured, in operation, to perform frequency hopping every second predetermined time interval to monitor the second set of control resources. The hopping pattern of the first control resource set is similar to the hopping pattern of the second control resource set.

The first and second predetermined time intervals may be a certain number K of symbols or slots or subframes. They may be the same or different from each other. Frequency hopping may generally be applied only to the first set, only the second set, neither of the sets, or both.

In one example, the second set of control resources is distributed in the frequency domain, and the circuit is configured, in operation, to perform frequency hopping every second predetermined time interval to monitor the second set of control resources. The hopping pattern of the first set of controlled resources is different from the hopping pattern of the second set of resources in at least one time interval and in at least a frequency band.

The hopping pattern of the first set of control resources defines a sequence of first set bandwidths (and corresponding operating bandwidths) that vary over time. The pattern may be applied repeatedly and periodically.

According to an exemplary combination of the above examples, the circuit further controls the receiver to receive system information including a list of entries, the entries representing respective candidates for the first control resource set configuration. , also configured to control the receiver to select the first controlled resource set configuration.

The selection may be performed based on supported numerology, for example.

Specifically, the first control resource set configuration parameters include at least one of a subcarrier spacing and a first control resource set bandwidth, and at least one of a preamble sequence and a random access channel resource.

In one example, the circuitry, in operation, selects the first control resource set according to at least one of subcarrier spacing and a bandwidth of the first control resource set supported by the communication device.

The second control resource set configuration also includes at least a bandwidth of the second control resource set or a second bandwidth (operating bandwidth for receiving data scheduled by control information carried in the second set). width). However, the second control resource set configuration parameters may also include numerology.

In one example, the first set of controlled resources configuration parameters further include a range of bandwidth capabilities of the communication device, and the circuit, in operation, selects the first set of controlled resources similarly according to its bandwidth capabilities.

Further, the circuitry, in operation, selects a first control resource set configuration if the communication device supports multiple configurations;
- random selection of one of the supported configurations,
- selection of a configuration with default subcarrier spacing and/or bandwidth of the first control resource set;
- selection based on the identifier of the communication device;
- Can be implemented as either a selection based on the current channel conditions of the communication device.

The first controlled resource set configuration parameter and/or the second controlled resource set configuration parameter may also further include a hopping indication indicating whether frequency hopping is to be applied to the corresponding controlled resource set.

Additionally, the first controlled resource set configuration parameter and/or the second controlled resource set configuration parameter further configures the hopping pattern indication when the hopping indication indicates that hopping is to be applied to the corresponding controlled resource set. may be included.

A hopping pattern indicates a sequence in time of frequencies (bandwidths) that carry a set of control resources.

The configuration of the second control resource set may include either a bandwidth of the second control resource set or a second bandwidth, or a subset of configuration parameters, and the circuitry, in operation, configures the first control resource set to Applying the remaining parameters of the resource set to the second control resource set.

In one exemplary embodiment, the circuit, in operation,
- monitoring the first set of controlled resources and/or the second set of controlled resources, and
- controlling the receiver to receive, within the first set of control resources and/or the second set of control resources, control information indicative of resource allocation for data transmission to the communication device;
- displaying a time-frequency numerology including at least one of subcarrier spacing, bandwidth, number of symbols or cyclic prefix length for resource allocation;

This disclosure also includes a transmitter 1470 capable of transmitting control signals to a communication device in a first set of control resources and a second set of control resources, and a receiver capable of receiving control signals and data. 1470 and a circuit 1480, which in operation:
- controlling the receiver to receive a random access message associated with the first set of control resources and to receive a communication device capability indication;
- transmitting control information in the first set of control resources after receiving the random access message and transmitting in the first set of control resources an indication of a configuration of a second set of control resources; control the transmitter,
- controlling the transmitter to transmit control information in the first set of control resources and/or the second set of control resources after transmitting the configuration of the second set of control resources;

As can be seen in FIG. 14, there is also an input/output node 1475 located between the transceiver 1470, which includes a transmitter and receiver, and the circuit 1480. Input/output node 1475 services data and control command input/output between transceiver 1470 and circuit 1480. Scheduling node 1460 may be, for example, a base station. However, the present disclosure is not limited thereto, and the scheduling node may be a relay node or a communication device that operates as a base station or relay node for other communication devices.

As can also be seen from FIG. 14, both the communication device and the base station use the same configuration of set 1 and set 2 and exchange configuration information as already explained above in connection with the communication device. Therefore, the embodiments and examples described above focusing on communication devices also apply to scheduling nodes (base stations).

The present disclosure also provides corresponding methods that may be implemented by circuitry 1430 of communication device 1410 and/or circuitry 1480 of base station 1460. Specifically, those circuits may control corresponding receivers/transmitters of communication devices and base stations to perform receiving/transmitting tasks such as those described below.

Specifically, as also shown in FIG. 16, a method for a communication device, comprising:
- sending 1620 a random access message associated with the first set of control resources;
- monitoring 1630 the control resources in the first set of control resources after sending the random access message;
- sending 1640 a communications device capability indication;
- receiving 1650 an indication of the configuration of a second set of control resources within the first set of control resources after the step 1640 of transmitting a communication device capability indication;
- monitoring 1660 the control resources in the first set of control resources and/or the second set of control resources after receiving the configuration of the second set of control resources.

Additionally, the method may also include receiving 1610 control information including a configuration of a candidate first set of control resources prior to sending the random access message. This control information may be received within the system broadcast.

Further, a method for a scheduling node, comprising:
- receiving 1625 a random access message associated with the first set of control resources;
- receiving a communication device capability indication 1645 (after receiving the random access message 1625);
- after the step 1625 of receiving the random access message, a step 1635 of transmitting control information on the first set of control resources;
- transmitting 1655 an indication of the configuration of a second set of control resources within the first set of control resources;
- sending 1665 control information in the first set of control resources and/or the second set of control resources after sending the configuration of the second set of control resources.

The steps described above may be performed as disclosed above in connection with the operations performed by the respective devices.

Furthermore, the above examples relate to a "communications device" or "UE" or "base station" or "gNB" or "scheduling device." However, the respective circuits of these devices (see circuits 1430 and 1480 in FIG. 14) alone may already provide the improvements described above. The circuit controls the device's transmitter and receiver, which may be a standard radio transmitter and receiver, including, for example, one or more antennas, amplifiers, and modulators. It may be. Its control is achieved by outputting control commands to the input/output nodes (1425, 1475) and by inputting received data (control and/or user data) from the input/output nodes for further processing by the circuit. Implemented by.

FIG. 18 shows an example random access procedure.

In step 1810, the UE (communication device) uses the sequence to send a random access preamble (i.e., a random access message) via uplink time-frequency resources associated with control resource set 1 selected from the candidate set. send.

In step 1820, the BS (Base Station, Scheduling Device) detects the random access attempt and then sends a message over the downlink data channel, which message is
- the index of the random access preamble sequence detected by the network and for which the response is valid;
- timing correction calculated by the random access preamble receiver;
- a scheduling grant indicating the resources that the terminal will use for transmission in step 1830;
- Contains the TC-RNTI, a temporary identity used for further communication between the UE and the network.

Since each Set 1 candidate has a separate sequence (and/or associated uplink resources for sending the preamble), the BS knows which Set 1 the UE has selected after decoding the preamble sequence. Therefore, the DCI indicating the resource carrying the above-mentioned message is sent in set 1 selected by the UE.

The UE that sent the preamble monitors the corresponding set 1 in order to receive the DCI and therefore the message.

In step 1830, after step 1820, the UE's uplink is time synchronized to the network. In step 1830, the UE sends an identifier to the BS via a normal uplink data channel to implement an RRC connection request. (There are no modifications compared to the LTE procedure)

At step 1840, contention resolution is performed. If multiple UEs happen to select the same random access resource (preamble sequence and associated uplink resources) from step 1820, perform simultaneous random access attempts using the same preamble resource in the first step 1810. Those UEs that do will listen to the same response message in the second step 1820 and therefore have the same temporary identifier. Therefore, in the fourth step 1840, each terminal receiving the downlink message will compare the identity in the message with the identity sent in the third step 1830. Only terminals that observe a match between the identity received in the fourth step 1840 and the identity sent as part of the third step 1830 will declare the random access procedure successful.

Step 1840 of the random access procedure illustrated above is similar to the LTE procedure, except that in step 1840 the DCI scheduling message is again transmitted in set 1 selected by the UE. The random access procedure described with reference to FIG. 18 is merely exemplary. The present disclosure is not limited by this random access procedure, and random access may also be implemented in different ways. In general, any access with randomly selected resources (by the random access message transmitter) may be applied.

Claims (17)

A communication system including a base station and a communication terminal,
The base station is
comprising a communication device capable of transmitting a control signal and data to the communication terminal in a first control resource set and a second control resource set,
The communication terminal is
a transmitter capable of transmitting control signals and data;
A circuit,
controlling the transmitter to transmit a random access message associated with the first set of controlled resources and to transmit a communication device capability indication;
monitoring control resources in the first set of control resources after transmitting the random access message; and receiving an indication of a configuration of the second set of control resources in the first set of control resources. control the receiver,
a circuit for controlling the receiver to monitor control resources in the first control resource set and/or the second control resource set after receiving the configuration of the second control resource set; ,
The circuit further includes:
controlling the receiver to receive a plurality of entries with system information, the entries indicating respective candidates for the first control resource set configuration;
selecting the first control resource set configuration from the plurality of entries;
notifying the base station of the selected first control resource set configuration using a random access message associated with the first control resource set;
Communications system. the first set of control resources is located within a first bandwidth; the second set of control resources is located within a second bandwidth;
The first bandwidth is a bandwidth in which any resource allocated by control information carried in the first control resource set is located;
the second bandwidth is a bandwidth in which any resource allocated by control information carried in the second control resource set of control resources is located;
The communication system according to claim 1. the first bandwidth and the second bandwidth are centered on each other in the frequency domain;
The communication system according to claim 2. The bandwidth of the first control resource set is included in the bandwidth of the second control resource set,
the first control resource set is a subset of the second control resource set;
The communication system according to claim 2. The first control resource set includes common control information that is decoded by a plurality of communication devices, as well as user-specific control information that is decoded only by a particular communication device,
the second control resource set includes the user-specific control information;
The communication system according to claim 1. the circuit controls a receiver to monitor the first set of control resources when the communication terminal is in an operating mode that promotes power saving;
The communication system according to claim 1. the first control resource set is distributed in the frequency domain;
the circuit controls the receiver to perform frequency hopping every first predetermined time interval to monitor the first set of controlled resources;
The communication system according to claim 1. the second control resource set is distributed in the frequency domain;
the circuit controls the receiver to perform frequency hopping every second predetermined time interval to monitor the second set of controlled resources;
a hopping pattern for the first set of control resources is similar to a hopping pattern for the second set of control resources;
The communication system according to claim 1. the second control resource set is distributed in the frequency domain;
the circuit controls the receiver to perform frequency hopping every second predetermined time interval to monitor the second set of controlled resources;
a hopping pattern for the first set of control resources differs from a hopping pattern for the second set of control resources in at least a frequency band in at least one time interval;
The communication system according to claim 1. The first control resource set configuration parameter and/or the second control resource set configuration parameter include at least one of a subcarrier spacing and a corresponding bandwidth of the control resource set, a preamble sequence, and the first control resource set. at least one of the random access channel resources of the set;
the circuit selects the first control resource set according to at least one of subcarrier spacing and a bandwidth of the first control resource set supported by the communication terminal;
The communication system according to claim 1. The first controlled resource set configuration parameter further includes a range of bandwidth capabilities of the communication device;
the circuit selects the first set of control resources according to the bandwidth capability;
The communication system according to claim 10. The circuit selects the first control resource set configuration when the communication terminal supports a plurality of control resource set configurations;
- random selection of one of said configurations supported;
- selection of a configuration with a default subcarrier spacing and/or bandwidth of said first control resource set;
- selection based on an identifier of said communication terminal;
- selection based on current channel conditions of said communication terminal;
Implemented as either of the following:
The communication system according to claim 10. The first controlled resource set configuration parameter and/or the second controlled resource set configuration parameter further include a hopping indication specifying whether frequency hopping should be applied to the corresponding controlled resource set.
The communication system according to claim 10. The first controlled resource set configuration parameter and/or the second controlled resource set configuration parameter determine a hopping pattern if the hopping indication indicates that hopping is to be applied to the respective controlled resource set. Show more including;
The communication system according to claim 13. the configuration of the second control resource set includes either a bandwidth of the second control resource set or a second bandwidth or a subset of configuration parameters;
the circuit applies remaining parameters of the first set of controlled resources to the second set of controlled resources;
The communication system according to claim 10. The circuit is
monitoring the first set of controlled resources and/or the second set of controlled resources, and
controlling the receiver to receive control information indicating resource allocation for data transmission to the communication terminal within the first control resource set and/or the second control resource set;
The resource allocation indicates a numerology including at least one of a subcarrier spacing and a cyclic prefix length.
The communication system according to claim 1. A method for a communication system including a communication terminal and a base station, the method comprising:
The base station transmits control signals and data to the communication terminal in a first control resource set and a second control resource set,
The communication terminal is
transmitting a random access message associated with the first set of controlled resources;
monitoring control resources in the first control resource set after transmitting the random access message;
transmit communication device capability indication;
after transmitting the communication device capability indication, receiving an indication of a configuration of the second control resource set of control resources within the first control resource set;
monitoring control resources in the first control resource set and/or the second control resource set after receiving the configuration of the second control resource set;
receiving a plurality of entries using system information, the entries indicating respective candidates for the first controlled resource set configuration;
selecting the first control resource set configuration from the plurality of entries;
notifying the base station of the selected first control resource set configuration using a random access message associated with the first control resource set;
Method.