Terminal, base station, and wireless communication system

Abstract

This terminal comprises a reception unit and a control unit. The reception unit receives, from a base station, a first signal including first information relating to a first resource on which a second signal is transmitted. When the reception unit has received the second signal via the first resource which corresponds to the first information included in the first signal and relating to the first resource on which the second signal is transmitted, the control unit performs control so as to perform adaptive control for adjusting a second resource on which a third signal is transmitted during a valid period from a first time to a second time.

Description

Terminals, base stations, and wireless communication systems

[0001] This invention relates to a terminal, a base station, and a wireless communication system.

[0002] Currently, mobile device traffic (smartphones and feature phones) accounts for the majority of network resources. Furthermore, the amount of traffic used by mobile devices is expected to continue to increase.

[0003] Furthermore, in addition to traffic used by mobile devices, IoT (Internet of Things) services (e.g., traffic systems, smart meters, monitoring systems for devices, etc.) are also being deployed. Therefore, networks are required to support services with diverse requirements. To support such diverse services, for example, the communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (e.g., Non-Patent Documents 1-14) have been formulated with support for many use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications) in mind.

[0004] Note that in the current 3GPP (3rd Generation Partnership Project (registered trademark)), as a technology for suppressing network power, a technology for adapting common signals / channels is being studied (Non-Patent Document 15). The common signals / channels include, for example, Synchronization Signal Block (SSB), Physical Broadcast Channel (PBCH), Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), Physical Random Access Channel (PRACH), Physical Downlink Control Channel (PDCCH) for scheduling Paging messages, and Physical Downlink Shared Channel (PDSCH) for transmitting Paging messages. The adaptation of common signals / channels is a technology that enables, for example, the adjustment of the transmission / reception cycle of common signals and channels and the transmission / reception resources of common signals and channels (Non-Patent Document 14).

[0005] Also, in 3GPP, in PRACH Adaptation, it is being discussed whether to enable PRACH Adaptation by using Downlink Control Information (DCI) (Non-Patent Documents 15 and 16).

[0006] 3GPP TS 37.324 V18.0.03GPP TS 37.340 V18.2.03GPP TS 38.201 V18.0.03GPP TS 38.202 V18.3.03GPP TS 38.211 V18.3.03GPP TS 38.212 V18.3.03GPP TS 38.213 V18.3.03GPP TS 38.214 V18.3.03GPP TS 38.215 V18.3.03GPP TS 38.300 V18.2.03GPP TS 38.321 V18.2.03GPP TS 38.322 V18.1.03GPP TS 38.323 V18.2.03GPP TS 38.331 V18.2.0RP-242354R1-2407409

[0007] By the way, the application of common signals / channels is still in the early stages of discussion and has not yet been decided in detail. For example, when applying common signals / channels, the timing of when to start the application, when to stop the application, the duration for which the application is applied (effective period of common signals / channel application), or the duration for which the application is removed (ineffective period of common signals / channel application) have not yet been decided.

[0008] Therefore, in order to adapt a common signal / channel, a method is required to set, for example, the timing for starting the adaptation of the common signal / channel, the timing for ending the adaptation, the validity period of the adaptation, or the invalidation period of the adaptation. Note that the timing or period that includes at least one of the timing for starting the adaptation of the common signal / channel, the timing for ending the adaptation, the validity period of the adaptation, or the invalidation period of the adaptation is referred to as the period related to the adaptation of the common signal / channel.

[0009] The disclosed technology, made in view of the above, provides a method for setting a period for common signal / channel adaptation and for base stations and terminals to perform common signal / channel adaptation within a predetermined period.

[0010] In one aspect, the present invention provides a terminal comprising: a receiving unit that receives a first signal including first information relating to a first resource on which a second signal is transmitted; and a control unit that, upon receiving a second signal via a first resource corresponding to the first information, controls the terminal to perform adaptive control to adjust the second resource on which a third signal is transmitted during an effective period from a first time to a second time.

[0011] According to the above-described embodiment, a period for common signal / channel adaptation can be set, and base stations and terminals can perform common signal / channel adaptation within the predetermined period.

[0012] Figure 1 shows an example of a wireless communication system in Embodiment 1. Figure 2 shows an example of a functional configuration block diagram of a base station in the wireless communication system in Embodiment 1. Figure 3 shows an example of a functional configuration block diagram of a terminal in the wireless communication system in Embodiment 1. Figure 4 shows an example of a sequence of the wireless communication system in Embodiment 1. Figure 5 shows an example of a terminal processing flow in Embodiment 1. Figure 6 shows an example of a predetermined section. Figure 7 shows an example of available PRACH resources in Embodiment 3. Figure 8 shows an example of available PRACH resources in Embodiment 3. Figure 9 shows an example of available PRACH resources in Embodiment 3. Figure 10 shows an example of the hardware configuration of a base station. Figure 11 shows an example of the hardware configuration of a terminal.

[0013] Hereinafter, this embodiment will be described in detail with reference to the drawings. The problems and embodiments described herein are examples only and do not limit the scope of the rights of this application. In particular, even if the wording of the description is different, if it is technically equivalent, the technology of this application can be applied even with different wording and does not limit the scope of the rights. Furthermore, each embodiment can be appropriately combined as long as the processing content is not contradictory.

[0014] Furthermore, the terminology and technical content used in this specification may be appropriately adapted from the terminology and technical content described in specifications and contributions of communication standards such as 3GPP. Examples of such specifications are those described in Non-Patent Documents 1 to 14.

[0015] The following describes in detail, with reference to the drawings, embodiments of the base station, terminal, and wireless communication system disclosed in this application. The following embodiments are not intended to limit the disclosed technology. Embodiment 1

[0016] Figure 1 shows an example of a wireless communication system 1 in Embodiment 1. The wireless communication system 1 includes a base station 100 and terminals 200A, 200B, and 200C. The base station 100 forms a cell C10. Terminals 200A, 200B, and 200C are located within cell C10. When terminals 200A, 200B, and 200C are not distinguished, they are simply referred to as terminal 200. The RRC state of terminal 200 is, for example, RRC (Radio Resource Control) Connected, RRC Inactive, or RRC Idle.

[0017] Furthermore, the base station 100 may be a small wireless base station (including micro wireless base stations, femto wireless base stations, etc.) such as a macro wireless base station or pico wireless base station, or a wireless base station of various sizes, and may be described as a wireless communication device, communication device, transmitting device, etc. Also, the terminal 200 may be a wireless terminal such as a mobile phone, smartphone, PDA (Personal Digital Assistant), personal computer, vehicle, airplane, drone, or other devices with wireless communication capabilities, or a device (sensor device, etc.) mounted on a robot, AV equipment, home appliances, office equipment, vending machine, other household equipment, industrial equipment, etc., and may be described as a wireless communication device, communication device, receiving device, mobile station, etc.

[0018] Base station 100 is connected to the network via wired connections with network devices (higher-level devices and other base stations) not shown in the diagram. Alternatively, base station 100 may be connected to the network devices wirelessly instead of via wired connections.

[0019] The base station 100 may separate its wireless communication function with the terminal 200 from its digital signal processing and control functions into separate devices. In this case, the device with wireless communication functionality can be called an RRH (Remote Radio Head), and the device with digital signal processing and control functions can be called a BBU (Base Band Unit). The RRH may be installed extending from the BBU, and they may be connected by a wired connection such as an optical fiber, or they may be connected wirelessly. Alternatively, instead of separating into RRH and BBU as described above, the base station may be separated into, for example, a Central Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). The DU may include, for example, the functions of the MAC (Media Access Control) layer. Furthermore, the DU may include, for example, the functionality of the RLC (Radio Link Control) layer. The RU may include at least an RF radio circuit. The DU and RU may be integrated into a single configuration.

[0020] Terminal 200 communicates with base station 100 via wireless communication.

[0021] Next, the base station 100 will be described. Figure 2 shows an example of a functional configuration block diagram of the base station 100. The base station 100 has a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0022] The wireless communication unit 110 consists of a transmitting unit 111 and a receiving unit 112, and communicates wirelessly with the terminal 200. Specifically, the transmitting unit 111 transmits downlink signals to the terminal 200, such as synchronization signals, SS / PBCH (Synchronization Signal / PBCH), paging signals, random access procedure signals, RRC layer signals, downlink data signals, and downlink control signals.

[0023] The receiving unit 112 can receive uplink signals transmitted from the terminal 200, such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals.

[0024] The control unit 120 controls the base station 100. Specifically, the control unit 120 can control the establishment of an RRC connection with the terminal 200, signal processing of signals received by the receiving unit 112, creation of transmission blocks (TBs), and mapping of transmission blocks to wireless resources. The control unit 120 can also control resources related to common signals and transmission / reception channels.

[0025] The memory unit 130 can store, for example, downlink data signals.

[0026] The communication unit 140 connects to network devices (e.g., host devices, other base station devices) via wired or wireless connections and performs communication. Data signals received by the communication unit 140 for the terminal 200 can be stored in the storage unit 130. Note that the wireless communication unit 110 and the communication unit 140 may be collectively referred to as the communication unit.

[0027] Next, the terminal 200 will be described. Figure 3 is a diagram showing an example of a functional configuration block diagram of the terminal 200. As shown in Figure 3, the terminal 200 comprises a communication unit 210, a control unit 220, and a storage unit 230. Each of these components is connected in such a way that signals and data can be input and output in one direction or bidirectionally. The communication unit 210 can be described separately as a transmitting unit 211 and a receiving unit 212.

[0028] The transmitting unit 211 transmits data signals and control signals wirelessly via an antenna. The antenna may be the same for both transmission and reception. The transmitting unit 211 transmits, for example, uplink signals such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals.

[0029] The receiving unit 212 receives downlink signals transmitted from the base station 100, such as synchronization signals, SS / PBCH signals, pagging signals, random access procedure signals, downlink data signals, and downlink control signals. The received signals may also include reference signals used for channel estimation and demodulation. The receiving unit 212 can also receive and measure measurement signals transmitted from the base station 100.

[0030] The control unit 220 controls the terminal 200. Specifically, the control unit 220 can control the establishment of an RRC connection with the base station 100, signal processing of signals received by the receiving unit 212, creation of transmission blocks (TBs), and mapping of transmission blocks to wireless resources. The control unit 220 can also control the measurement of measurement signals in the receiving unit 212.

[0031] The storage unit 230 can store, for example, uplink data signals. The storage unit 230 can also store configuration information (or setting information) related to wireless communication transmitted from the base station 100.

[0032] Next, an example of the processing of the wireless communication system 1 in Embodiment 1 will be described using Figure 4. Figure 4 is a diagram showing an example of a sequence diagram of the wireless communication system in Embodiment 1.

[0033] Figure 4 will be explained. The transmitting unit 111 of the base station 100 transmits a first signal (step S10). The receiving unit 212 of the terminal 200 receives the first signal (step S10). The first signal includes, for example, setting information for a second signal and a third signal. The setting information includes, for example, first information regarding a first resource to which the second signal is transmitted, and second information regarding a second resource to which the third signal is transmitted. The first signal may also include third information, which is information for adapting a common signal / channel.

[0034] The transmitting unit 111 of the base station 100 transmits a second signal according to the setting information included in the first signal (step S20). The receiving unit 212 of the terminal 200 receives the second signal (step S20). The second signal is an example of a signal that instructs the adaptation of a common signal / channel. The control unit 120 of the base station 100, for example, if it determines that it will perform adaptation of a common signal / channel, controls the base station 100 to transmit the second signal via the first resource corresponding to the first information. The second signal may also include information that instructs the adaptation of a common signal / channel. Information that instructs the adaptation of a common signal / channel is an example of the fourth information.

[0035] The control unit 220 of terminal 200 performs a first process for implementing common signal / channel adaptation (step S30). The first process starts the common signal / channel adaptation from a first time in response to the reception of the second signal. The common signal / channel adaptation is one or more of the following: SSB (SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) Block) adaptation, PRACH (Physical Random Access Channel) adaptation, or paging adaptation. Furthermore, common signal / channel adaptation is an example of adaptive control. Therefore, common signal / channel adaptation may also be described as adaptive control for the channel transmitting the third signal or for the third signal. The third signal may be an uplink signal or a downlink signal. Furthermore, the third signal could be, for example, an SSB, PRACH, or paging signal.

[0036] For example, when SSB adaptation is performed, the control unit 220 of terminal 200 updates the SSB reception cycle. Also, for example, when paging adaptation is performed, the control unit 220 of terminal 200 updates the paging cycle or transmission resources. The second information also includes, for example, information regarding the SSB measurement cycle or monitoring cycle when the common signal / channel adaptation is SSB adaptation. The second information also includes, for example, information regarding the paging monitoring cycle or the time-domain and / or frequency-domain resources of the paging physical downlink control channel when the common signal / channel adaptation is paging adaptation.

[0037] Furthermore, for example, when PRACH adaptation is performed, the control unit 220 of terminal 200 updates the resource location for PRACH. Alternatively, when PRACH adaptation is performed, the control unit 220 of terminal 200 changes whether the set resource is available or not. The resource location for PRACH may be described as a RACH Occasion. The second information also includes, for example, information for setting a RACH Occasion indicating the resource location for PRACH, and at least one of the following: information for setting a RACH Occasion indicating the resource location for PRACH, and information for a PRACH resource whose availability can be changed. The second signal also includes, for example, information for enabling / disabling all or part of the RACH Occasion indicating the resource location for PRACH. The information for setting a RACH Occasion indicating the resource location for PRACH may be transmitted, for example, in an RRC layer signal different from the first signal. The second signal also includes, for example, information on the availability of the PRACH Occasion. Furthermore, the second signal includes information to enable / disable PUSCH Occasions for transmitting RACH opportunities and Msg A associated with RACH opportunities, for example, when a PUSCH resource associated with a PRACH resource is configured. A PUSCH opportunity associated with a RACH opportunity is a PUSCH opportunity contained in N slots that follow the starting position of the slot to which this RACH opportunity belongs (called a PRACH slot) after a time offset. Here, the time offset and N are set by the base station 100.

[0038] Furthermore, the control unit 120 of the base station 100 performs a second process for adapting the common signal / channel (step S40). The second process starts adapting the common signal / channel from the first time in response to the transmission of the second signal. The adaptation of the common signal / channel may be one or more of the following: SSB adaptation, PRACH adaptation, or paging adaptation.

[0039] For example, when SSB adaptation is performed, the control unit 120 of the base station 100 updates the SSB reception cycle. Also, for example, when paging adaptation is performed, the control unit 120 of the base station 100 updates the paging cycle or the transmission resources.

[0040] For example, when PRACH adaptation is performed, the control unit 120 of the base station 100 updates the resource location for PRACH and controls the system to monitor the updated resource location for PRACH.

[0041] In the case of PRACH adaptation, the transmitter 211 of the terminal 200 transmits an uplink signal (e.g., PRACH) at the transmission timing corresponding to the adaptation of the common signal / channel. The receiver 112 of the base station 100 receives a third signal at the monitoring timing of the uplink signal (e.g., PRACH preamble) corresponding to the adaptation of the common signal / channel.

[0042] The information for adapting to a common signal / channel may be transmitted in the first signal, or in a signal different from the first signal. Alternatively, the information for adapting to a common signal / channel may be predetermined and stored in the memory unit 130 of the base station 100 and the memory unit 230 of the terminal 200. Alternatively, the information for adapting to a common signal / channel may be included in the second signal. The information for adapting to a common signal / channel is an example of the third type of information. The first signal is, for example, an RRC layer signal. The RRC layer signal includes, for example, SIB (System Information Block) information.

[0043] Further, the control unit 120 of the base station 100 performs settings when adapting the common signal / channel by using information for adapting the common signal / channel. Also, the control unit 220 of the terminal 200 performs settings when adapting the common signal / channel by using information for adapting the common signal / channel.

[0044] Note that the information for adapting the common signal / channel is, for example, the period information of the adaptation of the common signal / channel and the resource information (monitoring resource information) of the common signal / channel. Also, the information for adapting the common signal / channel may be, for example, coefficient information. When the information for adapting the common signal / channel is a coefficient, for example, the control unit 120 of the base station 100 controls such that X×Y obtained by multiplying the period (or interval) X before the adaptation of the common signal / channel by the coefficient Y becomes the period (or interval) after the adaptation of the common signal / channel. Also, for example, the control unit 220 of the terminal 200 controls such that X×Y obtained by multiplying the period (or interval) X before the adaptation of the common signal / channel by the coefficient Y becomes the period (or interval) after the adaptation of the common signal / channel.

[0045] Next, the first process in Embodiment 1 will be described with reference to FIG. 5. FIG. 5 is an example of the processing flow of the terminal 200 in Embodiment 1.

[0046] When the received second signal instructs adaptation of the common signal / channel, the control unit 220 of the terminal 200 starts the adaptation of the common signal / channel from the first time (step S31).

[0047] Note that the first time is, for example, the time after a predetermined time from receiving the second signal. Also, the first time is the start of the SSB period, the start of the modification period, the start of the SSB-to-RO mapping cycle, the start of the association period, the start of the association pattern period, the start of the paging cycle. For example, when the terminal 200 receives the second signal in Modification Period #1, the slot or symbol at the start of Modification Period #2 corresponds to the first time. Note that the SSB period, modification period, SSB-to-RO mapping cycle, association period, association pattern period, paging cycle may be described as predetermined intervals. In this case, for example, when the terminal 200 receives the second signal in predetermined interval #1, the slot or symbol at the start of predetermined interval #2 corresponds to the first time.

[0048] Next, the control unit 220 of the terminal 200 checks whether it is the second time (step S32). Note that the second time may be the time after the time corresponding to the valid period has elapsed from the first time, or may be a predetermined time. Note that the valid period may be set by, for example, the third information, or a predetermined value may be used. Also, the control unit 220 of the terminal 200 may start a timer corresponding to the valid period at the first time, and when the timer expires, determine that it is the second time. Note that the value of the timer may be set by, for example, the third information, or a predetermined value may be used. Also, the control unit 220 of the terminal 200 may determine whether it has passed the second time.

[0049] If it is not the second time (or the time corresponding to the validity period has not elapsed) (Step S32: No), the control unit 220 of terminal 200 performs the application of the common signal / channel until the second time occurs. If it is the second time (or the time corresponding to the validity period has elapsed) (Step S32: Yes), the control unit 220 of terminal 200 terminates the application of the common signal / channel (Step S33). When the control unit 220 of terminal 200 terminates the application of the common signal / channel, it applies, for example, the settings before the application of the common signal / channel.

[0050] Furthermore, at the base station 100, a second process similar to the first process performed at the terminal 200 as described using Figure 5 is performed in step S40 as described using Figure 4.

[0051] This section explains the period (effective period) for implementing common signal / channel adaptation, as well as how to set and specify this effective period.

[0052] The effective period for common signal / channel adaptation is set to, for example, N times a predetermined interval (where N is 1 or greater). The predetermined interval is, for example, the SSB period, SSB-to-RO mapping cycle, Association period, Association pattern period, Paging cycle (e.g., default paging cycle), or Modification period. Alternatively, an end timing for common signal / channel adaptation may be set, and the effective period for common signal / channel adaptation may be defined as the period from the start to the end timing of common signal / channel adaptation.

[0053] Here, we will explain an example of a predetermined section. Figure 6 is a diagram showing an example of a predetermined section. Note that Figure 6(A) is a diagram showing an example of an SSB-to-RO mapping cycle, association period, and association pattern period.

[0054] Figure 6(A) shows an example of an Association pattern period consisting of four Frames #0, #1, #2, and #3. The SSB-to-RO mapping cycle is the period containing the ROs to which, for example, SSB0 / 1, SSB2 / 3, SSB4 / 5, and SSB6 / 7 are mapped. The Association period represents the period in which each SSB index is mapped to at least one RO. An Association period can contain multiple mapping cycles. For example, Figure 6(A) contains two mapping cycles within Association period #1. Furthermore, an Association pattern period is a period formed by combining different Association periods. For example, Figure 6(A) shows an example where an Association pattern period consists of Association period #1 and Association period #2.

[0055] Figure 6(B) shows an example of a Modification period. During the Modification period, terminal 200 monitors the second signal at at least one of a plurality of times A1, A2, ... An. For example, terminal 200A receives the second signal from base station 100 at time A1 of modification period #n, and terminal 200B receives the second signal from base station 100 at time A2 of modification period #n.

[0056] Next, the method for setting the validity period and the method for indicating the validity period will be explained. The predetermined interval may be indicated by the third piece of information, or by the value N (where N is 1 or greater) indicated by the third piece of information. Alternatively, any value corresponding to the pre-set third piece of information may be used.

[0057] The base station 100 transmits the third information to the terminal 200 using SIB or RRC layer signals. The third information includes information indicating one or more validity periods. If the third information includes information indicating one validity period, the terminal 200 and the base station 100 will perform common signal / channel adaptation for the set validity period if common signal / channel adaptation is performed. For example, if the value N is notified in the third information, the validity period will be N times the predetermined interval. If the third information is not transmitted from the base station 100, the base station 100 and the terminal 200 may use a default validity period (X times the predetermined interval (X is 1 or more)). For example, the validity period may be specified in advance in the specifications, etc., and the specified validity period may be used. The third information may be transmitted, for example, included in the first signal, or included in a signal different from the first signal.

[0058] Furthermore, if the third piece of information includes information indicating multiple validity periods, when the terminal 200 and base station 100 perform common signal / channel adaptation, instruction information indicating one of the multiple validity periods is transmitted from base station 100 to terminal 200, and base station 100 and terminal 200 perform common signal / channel adaptation for the validity period indicated by the instruction information. The instruction information may be transmitted, for example, included in the second signal, or included in a signal different from the second signal.

[0059] The instruction information consists of multiple bits, and these bits are used to indicate one of several validity periods set in the third piece of information. The relationship between the multiple bits included in the instruction information and the multiple validity periods may be set in the third piece of information, for example. For example, if the multiple bits included in the instruction information consist of two bits, up to four validity periods can be set. At least some of the multiple validity periods may be set to a preset value. For example, if the multiple bits consist of two bits, two may be set to a preset value and two to RRC. Alternatively, all bits may be set to a preset value. Furthermore, the multiple bits included in the instruction information may be used to indicate the discontinuation of common signal / channel adaptation.

[0060] Furthermore, the multiple bits included in the instruction information may include at least one combination indicating the discontinuation of common signal / channel adaptation, and a combination in which the validity period of common signal / channel adaptation is not determined. For example, if the multiple bits consist of two bits, "00" may indicate the discontinuation of common signal / channel adaptation, "01" may indicate a combination in which the validity period of common signal / channel adaptation is not determined, and "10" and "11" may indicate the validity period set by the third information.

[0061] Alternatively, for example, if multiple bits are 2 bits, “00” may indicate the discontinuation of common signal / channel adaptation, “01” may indicate a combination in which the validity period of common signal / channel adaptation is not determined, “10” may indicate a validity period defined in advance in the specifications, and “11” may indicate a validity period set by third information transmitted from base station 100.

[0062] The number of bits in the instruction information can be any number; for example, it can be one or more bits. The instruction information is an example of the fourth type of information.

[0063] As described above, in Embodiment 1, the base station 100 transmits a first signal to the terminal 200 that includes first information relating to the first resource on which the second signal is transmitted. When the terminal 200 receives the second signal via the first resource corresponding to the first information, it performs adaptive control to adjust the second resource on which the third signal is transmitted during the validity period from the first time to the second time. Also, when the base station 100 transmits the second signal via the first resource, it performs adaptive control to adjust the second resource during the validity period from the first time to the second time. In this way, the base station and the terminal can set a period for the adaptation of the common signal / channel and perform the adaptation of the common signal / channel over a predetermined period. Embodiment 2

[0064] Embodiment 1 described an example in which a base station 100 and a terminal 200 perform adaptive control during an effective period from a first time to a second time. Embodiment 2 describes an example in which adaptation of multiple common signals / channels is made possible. In Embodiment 2, the wireless communication system, base station, and terminal are the same as in Embodiment 1, so their description is omitted.

[0065] Two examples are given for instructing the adaptation of multiple common signals / channels. Note that the adaptation of multiple common signals / channels must be at least two of the following: Pagging adaptation, PRACH adaptation, and SSB adaptation.

[0066] (First example) The first example demonstrates how a second signal can be used to enable the adaptation of multiple common signals / channels.

[0067] The base station 100 transmits a second signal to the terminal 200 that includes adaptive information instructing the terminal to adapt to a plurality of common signals / channels. Here, for example, the adaptive instruction information may consist of 3 bits, with each bit corresponding to Paging adaptation, PRACH adaptation, or SSB adaptation. Alternatively, the instruction information described in Embodiment 1 and the adaptive instruction information may be combined to form adaptive information, and the validity period and adaptive instruction may be indicated for Paging adaptation, PRACH adaptation, and SSB adaptation, respectively. For example, when configuring 2 bits of adaptive information for PRACH adaptation, "00" indicates that PRACH adaptation will not be performed, and at least one of "01", "10", or "11" indicates that PRACH adaptation will be performed and its validity period. The validity period may be the same as that of the instruction information described in Embodiment 1.

[0068] The adaptive indication information may also indicate the adaptation of one of several common signals / channels among the adaptations of multiple common signals / channels. The adaptive information is an example of the fourth type of information. Furthermore, the adaptive indication information is an example of the fourth type of information.

[0069] Furthermore, the validity period for the adaptation of a common signal / channel enabled by the adaptation instruction information will be, for example, a common validity period for all common signal / channel adaptations. In short, the set validity period will be a common time for the adaptation of multiple common signals / channels. Also, for example, if a validity period is set for the adaptation of a first common signal / channel among multiple common signal / channel adaptations, but not for the adaptation of a second common signal / channel, the validity period set for the adaptation of the first common signal / channel may also be used for the adaptation of the second common signal / channel.

[0070] (Second example) The second example shows how to instruct the adaptation of multiple common signals / channels using different signal types.

[0071] For example, Paging adaptation is indicated with SIB, and PRACH adaptation is indicated with downlink control signals including DCI. In short, the adaptation of multiple common signals / channels is instructed by corresponding to the type of second signal being transmitted. In other words, the type of second signal corresponds to the adaptation instruction information. Note that the adaptation instruction information is an example of the fourth type of information.

[0072] The validity period for the enabled common signal / channel adaptation may be, for example, a common validity period for all common signal / channel adaptations, or it may be set for each of the multiple common signal / channel adaptations. Alternatively, the validity period for the enabled common signal / channel adaptation may be common to each group, for example, by dividing the multiple common signal / channel adaptations into multiple groups. For example, the adaptations for downlink signals (e.g., Paging adaptation, SSB adaptation) may be the first group, and the adaptations for uplink signals (e.g., PRACH adaptation) may be the second group.

[0073] As described above, in Embodiment 2, the base station 100 transmits a first signal to the terminal 200 that includes first information relating to the first resource on which the second signal is transmitted. When the terminal 200 receives the second signal via the first resource corresponding to the first information, it performs adaptive control for multiple signals for the duration of the validity period. Also, when the base station 100 transmits the second signal via the first resource, it performs adaptive control for multiple signals for the duration of the validity period. In this way, the base station and the terminal can set a period for the adaptation of the common signal / channel and perform the adaptation of the common signal / channel for a predetermined period. Embodiment 3

[0074] Embodiment 1 describes an example in which a base station 100 and a terminal 200 perform adaptive control during an effective period from a first time to a second time. Embodiment 2 describes an example in which adaptation of multiple common signals / channels is made possible. Embodiment 3 describes a specific example in which a second signal instructs PRACH adaptation using a downlink control signal. In Embodiment 3, the wireless communication system, base station, and terminal are the same as in Embodiments 1 and 2, so their description is omitted.

[0075] First, we will explain in detail the case where the second signal is a downlink control signal.

[0076] If the second signal is a downlink control signal, the monitoring opportunity for the second signal is set using the first information included in the first signal. The monitoring opportunity for the second signal is set, for example, by information about the resource to which the second signal is transmitted, which is included in the setting information. The first information is the first resource to which the second signal is transmitted, and may include, for example, information for configuring a search space for receiving the second signal.

[0077] Then, the control unit 220 of the terminal 200 controls the monitoring of the second signal during the second signal monitoring opportunity.

[0078] Furthermore, if the second signal is a downlink control signal, an existing DCI (Downlink Control Information) format may be used, or a new DCI format may be defined. When using an existing DCI format, for example, DCI format 1_0, DCI format 2_7, and DCI format 2_9 may be used. Also, the second signal may be scrambled using an existing RNTI (Radio Network Temporary Identifier), or it may be scrambled using a new RNTI. When using existing RNTIs, for example, P-RNTI (Paging RNTI), SI-RNTI (System Information-RNTI), PEI-RNTI (Paging Early Indicator-RNTI), and CellDTRX (Cell DTX (Discontinuous Transaction) / DRX (Discontinuous Reception)-RNTI) should be used.

[0079] When using DCI format 1_0, for example, paging DCI is used. That is, when scrambling is performed using P-RNTI. When using paging DCI, there are 4 reserved bits in the short message field (bits 5 to 8 out of 8) (see Non-Patent Literature 14). Therefore, one or more of these 4 reserved bits are used to indicate the adaptation of common signals / channels. For example, when using multiple bits, one reserved bit may be used for each type or group of common signal / channel adaptation.

[0080] Furthermore, when using paging DCI, indications may be made using, for example, the reserved bit of the short message indicator field. For example, the short message indicator field has a reserved bit "00" (see Non-Patent Literature 6). Therefore, when the bit in the short message indicator field shows "00", it may be used to indicate the application of a common signal / channel.

[0081] Furthermore, when using paging DCI, existing fields may be interpreted as new fields. For example, if common signal / channel adaptation is configured, a portion of the existing fields may be designated as new fields to indicate common signal / channel adaptation. Note that common signal / channel adaptation is configured, for example, via a first signal and at least one signal different from the first signal.

[0082] Furthermore, when interpreting an existing field as a new field, this can be used if the configuration corresponding to the existing field and the configuration corresponding to the adaptation of common signals / channels are not set simultaneously. For example, if the existing field is a TRS availability indication field, the configuration related to TRS and the configuration corresponding to the adaptation of common signals / channels are not set simultaneously.

[0083] When using DCI format 2_7, for example, PEI (Pagging Early Indicator) would be used. When using DCI format 2_9, for example, other group-common DCI would be used.

[0084] The DCI format used may be changed depending on the RRC status of terminal 200. For example, if the RRC status of terminal 200 is idle or inactive, paging DCI or PEI is used to instruct the adaptation of common signals / channels. Alternatively, if the RRC status of terminal 200 is connected, paging DCI or other group-common DCI is used to instruct the adaptation of common signals / channels.

[0085] Alternatively, a new RNTI may be defined for the signal that instructs the adaptation of the common signal / channel, and the downlink control information scrambled using the new RNTI may be included in the second signal to instruct the adaptation of the common signal / channel.

[0086] Figures 7, 8, and 9 illustrate the processing of the base station 100 and terminal 200 when instructing PRACH adaptation using control signals including DCI. Figures 7, 8, and 9 show an example of available PRACH resources in Embodiment 3.

[0087] Figure 7 shows an example where, in the downlink (DL), monitoring opportunities D1 to D5 for the second signal are set for terminal 200A, and monitoring opportunities E1 to E5 for the second signal are set for terminal 200B. Figure 7 also shows that multiple PRACH resources are set in the uplink (UL). The multiple PRACH resources shown in Figure 7 represent PRACH resources that become unavailable when PRACH adaptation is performed. Therefore, terminal 200 may be configured with PRACH resources that can be used even when PRACH adaptation is performed. Note that PRACH resources that can be used even when PRACH adaptation is performed are an example of first PRACH resources, and PRACH resources that become unavailable when PRACH adaptation is performed are an example of second resources. Therefore, the PRACH resources shown in Figure 7 correspond to second PRACH resources. Furthermore, in Figure 7, the monitoring opportunities D1 to D5 for the second signal are set, for example, for each DCI reception cycle P1.

[0088] The base station 100 decides to perform PRACH adaptation and transmits a second signal containing information instructing PRACH adaptation at monitoring opportunity D1 and monitoring opportunity E1. The information instructing PRACH adaptation can be, for example, the method described in Embodiment 1 and Embodiment 2.

[0089] Subsequently, as shown in Figure 8, the use of multiple PRACH resources is disabled during the validity period V1 from time T1 to time T2. After time T2, the multiple PRACH resources become available again.

[0090] Furthermore, if base station 100 decides to perform PRACH adaptation, it may transmit a second signal containing information instructing PRACH adaptation at monitoring opportunity D1 and monitoring opportunity E1, and then transmit a second signal containing information instructing PRACH adaptation or information instructing cancellation of PRACH adaptation at monitoring opportunity D2 and monitoring opportunity E2. For example, the information instructing PRACH adaptation or the information instructing cancellation of PRACH adaptation may be combined into a single bit of information representing whether or not to perform PRACH adaptation.

[0091] An example in which a second signal containing information instructing PRACH adaptation is transmitted at monitoring opportunities D2 and E2 will be explained using Figure 9.

[0092] As shown in Figure 9, the PRACH application is extended from time T3, during the validity period V1 between time T1 and time T2, until time T4, when the validity period V2 expires. In this way, it becomes possible to extend the validity period of the PRACH application.

[0093] Furthermore, if a second signal containing information instructing the discontinuation of PRACH application is transmitted at monitoring opportunities D2 and E2, for example, multiple PRACH resources from time T3 onwards in Figure 9 can be activated. Therefore, when PRACH resources are insufficient, it is possible to increase PRACH resources without waiting for their validity period to expire. Note that if the information at monitoring opportunities D2 and E2 indicates that PRACH application should not be performed, PRACH application may be carried out until the validity period at time T2.

[0094] Furthermore, if a second signal containing information indicating whether or not to make the PRACH resource available is transmitted at monitoring opportunities D2 and E2, the information indicating whether or not to make it available will, for example, indicate whether or not the PRACH resource will be made available within the validity period. For example, if the information indicating whether or not to make the PRACH resource available is 1 bit, and the value is "1", then the PRACH resource will be available within the validity period. If the value of the 1 bit is "0", then it indicates that there is no change in the current assumption regarding the availability or unavailability of the PRACH resource. For example, if the value of the 1 bit of information indicating whether or not to make the PRACH resource available in the second signal received at monitoring opportunities D1 and E1 is "1", then it indicates that the PRACH resource will be available within the validity period from T1 to T2. In this case, if the value of the 1 bit of information indicating whether or not to make the PRACH resource available in the second signal received at monitoring opportunities D2 and E2 is "1", then the PRACH resource will be available until T4. In this way, the period during which the PRACH resource is available is extended. If the value of one bit of the information indicating whether or not the PRACH resource is available, contained in the second signal received at monitoring opportunities D2 and E2, is "0", the assumption that the PRACH resource is available or not remains unchanged, and it will be available until T2, as indicated by the second signal received at monitoring opportunities D1 and E1.

[0095] Furthermore, if the information indicating whether or not to make the PRACH resource available in monitoring opportunities D2 and E2 uses, for example, one bit to indicate whether or not to make the PRACH resource available, a value of "1" indicates that it is available within the validity period, and a value of "0" indicates that the PRACH resource is unavailable. For example, if the value of one bit in the information indicating whether or not to make the PRACH resource available in the second signal received at monitoring opportunities D1 and E1 is "1", it indicates that the PRACH resource is available within the validity period from T1 to T2. In this case, if the value of one bit in the information indicating whether or not to make the PRACH resource available in the second signal received at monitoring opportunities D2 and E2 is "0", then multiple PRACH resources will be unavailable from time T3 onwards. Therefore, when saving power, the PRACH resource can be reduced without waiting for the validity period to expire.

[0096] Furthermore, terminal 200 may choose not to perform monitoring during the validity period V1. For example, in Figure 8, terminal 200A does not receive the second signal at monitoring opportunity D2. Also, for example, in Figure 8, terminal 200B does not receive instruction information and / or adaptive instruction information at monitoring opportunity E2. Also, for example, in Figure 8, base station 100 does not transmit instruction information and / or adaptive instruction information at monitoring opportunities D2 and E2. By doing so, base station 100 and terminal 200 do not need to send and receive instruction information and / or adaptive instruction information at some monitoring opportunities, and base station 100 can use this resource for transmitting other downlink control information or downlink channels. Furthermore, terminal 200 can save power.

[0097] Furthermore, while terminal 200 monitors monitoring opportunities during the validity period V1, it may choose not to expect instruction information and / or adaptive instruction information during the validity period. In short, during the validity period V1, the instruction information and / or adaptive instruction information will be the same information. In this case, terminal 200 can decide whether or not to receive downlink control information depending on the implementation, and if power saving of terminal 200 is to be achieved, it may choose not to receive downlink control information.

[0098] The example described involves performing PRACH adaptation and temporarily disabling the PRACH resource. However, it is also possible to perform PRACH adaptation from a state where the PRACH resource is disabled and temporarily enable the PRACH resource. In that case, for example, the base station 100 instructs the terminal 200 to enable the PRACH resource for the duration of its validity period using instruction information and / or adaptation instruction information.

[0099] As described above, in Embodiment 3, the base station 100 transmits a first signal to the terminal 200 that includes first information relating to a first resource to which a downlink control signal is transmitted. When the terminal 200 receives a downlink control signal that includes information indicating the activation or deactivation of multiple PRACH resources via the first resource corresponding to the first information, it performs adaptive control to adjust the second resource for transmitting PRACH for the duration of the validity period. Furthermore, when the base station 100 transmits a downlink control signal that includes information indicating the activation or deactivation of multiple PRACH resources via the first resource corresponding to the first information, it performs adaptive control to adjust the second resource for transmitting PRACH for the duration of the validity period. In this way, the base station and the terminal can set a period for common signal / channel adaptation and perform common signal / channel adaptation for a predetermined period. Hardware configuration of each device in each embodiment

[0100] The hardware configuration of each device in the wireless communication system of each embodiment will be described based on Figures 10 to 11.

[0101] Figure 10 shows an example of the hardware configuration of base station 100. As shown in Figure 10, the base station 100 has, as hardware components, an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360. The CPU is connected via a bus to enable input and output of various signals and data signals. The memory 350 includes, for example, at least one of RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, and stores programs, control information, and data signals.

[0102] The correspondence between the functional configuration of the base station 100 shown in Figure 2 and the hardware configuration of the base station 100 shown in Figure 10 will be explained. The transmitting unit 111 and the receiving unit 112 (or wireless communication unit 110) are realized by, for example, an RF circuit 320, or an antenna 310 and an RF circuit 320. The control unit 120 is realized by, for example, a CPU 330, a DSP 340, a memory 350, and a digital electronic circuit (not shown). Examples of digital electronic circuits include ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), and LSI (Large Scale Integration). The storage unit 130 is realized by, for example, a memory 350. Furthermore, the communication unit 140 is implemented, for example, by a network IF 360.

[0103] Figure 11 shows an example of the hardware configuration of terminal 200. As shown in Figure 11, terminal 200 has, as hardware components, an RF circuit 420 equipped with an antenna 410, a CPU 430, a DSP 440, and a memory 450. The memory 450 includes at least one of RAM such as SDRAM, ROM, and flash memory, and stores programs, control information, and data signals.

[0104] The correspondence between the functional configuration of terminal 200 shown in Figure 3 and the hardware configuration of terminal 200 shown in Figure 11 will be explained. The transmitting unit 211 and the receiving unit 212 (or the communication unit 210) are realized by, for example, an RF circuit 420, or an antenna 410 and an RF circuit 420. The control unit 220 is realized by, for example, a CPU 430, a DSP 440, a memory 450, and a digital electronic circuit (not shown). Examples of digital electronic circuits include ASICs, FPGAs, and LSIs. The storage unit 230 is realized by, for example, a memory 450.

[0105] Furthermore, each embodiment may be combined as appropriate, within the bounds of consistency.

[0106] Although each embodiment describes an example of a base station and a terminal, the disclosed technology is not limited to these examples and can be applied to various devices such as electronic equipment mounted on automobiles, trains, airplanes, satellites, electronic equipment transported by drones, robots, AV equipment, home appliances, office equipment, vending machines, and other everyday devices.

[0107] Furthermore, although each embodiment was explained using fifth-generation mobile communication as an example, the disclosed technology is not limited to these. For example, the disclosed technology may be applied to mobile communication of different generations, such as sixth-generation or seventh-generation.

[0108] 1 Wireless Communication System 100 Base Station C10 Cell 110 Wireless Communication Unit 111 Transmitter 112 Receiver 120 Control Unit 130 Memory Unit 140 Communication Unit 200, 200A, 200B, 200C Terminal 210 Communication Unit 211 Transmitter 212 Receiver 220 Control Unit 230 Memory Unit 310 Antenna 320 RF Circuit 330 CPU 340 DSP 350 Memory 360 Network IF 410 Antenna 420 RF Circuit 430 CPU 440 DSP 450 Memory

Claims

1. A terminal comprising: a receiving unit that receives a first signal including first information relating to a first resource to which a second signal is transmitted; and a control unit that, when the second signal is received via the first resource corresponding to the first information, controls the terminal to perform adaptive control to adjust the second resource to which a third signal is transmitted during an effective period from a first time to a second time.

2. The terminal according to claim 1, wherein the first signal further includes second information relating to the second resource on which the third signal is transmitted.

3. The terminal according to claim 1, wherein the first signal includes a third piece of information relating to the validity period.

4. The terminal according to claim 1, wherein the second signal includes a fourth piece of information instructing the implementation of the adaptive control.

5. The terminal according to claim 1, wherein the first signal is a signal of the RRC layer, the second signal is PDCCH, and the third signal is PRACH.

6. The terminal according to claim 1, wherein the second signal includes instruction information indicating a signal to perform the adaptive control and adaptive instruction information indicating one piece of information corresponding to a plurality of validity periods, and the control unit controls the signal to perform the adaptive control to perform the adaptive control for the duration of the validity period, in accordance with the instruction information and the adaptive instruction information.

7. The terminal according to claim 6, wherein the first signal includes a third piece of information for setting at least one of the plurality of validity periods.

8. A base station comprising: a transmitting unit that transmits a first signal including first information relating to a first resource to which a second signal is transmitted; and a control unit that, when the second signal is transmitted via the first resource corresponding to the first information, controls adaptive control to adjust the second resource to which a third signal is transmitted during an effective period from a first time to a second time.

9. A wireless communication system comprising: a base station that transmits a first signal including first information relating to a first resource on which a second signal is transmitted; and a terminal that, upon receiving the second signal via the first resource corresponding to the first information, controls adaptive control to adjust the second resource on which a third signal is transmitted during a valid period from a first time to a second time, wherein the base station controls adaptive control to adjust the second resource on which the third signal is transmitted during the preceding valid period, upon transmitting the second signal via the first resource corresponding to the first information.

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