Some bandwidth switching methods, communication network systems, base stations and user equipment

Abstract

This application discloses a partial bandwidth (BWP) handover method, and a communication network system, base station, and user equipment using this method. At least one base station in the network system can communicate with at least one user equipment through at least one portion of the bandwidth. In one embodiment, the partial bandwidth handover method is initiated by the base station. The base station and the user equipment perform a Random Access Procedure (RAP). Then, the base station selects a target partial bandwidth based on an inactive channel state of at least one inactive partial bandwidth. Finally, the base station transmits a handover instruction to the user equipment, causing the user equipment to handover to the target partial bandwidth. In another embodiment, provided that the user equipment and the base station are in a Radio Resource Control (RRC) connection state, the user equipment selects a target partial bandwidth based on an inactive channel state of at least one inactive partial bandwidth, and then hands over to the target partial bandwidth.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a partial bandwidth switching method applied to a communication network system including at least one base station and at least one user equipment. Background Technology

[0002] The fifth-generation mobile communication network system (5G NR) includes three major application scenarios: enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable low-latency communication (URLLC). Between mMTC and URLLC, there is another category of application scenarios that are more time-sensitive and have relatively lower device complexity, such as industrial IoT sensors, smart monitoring in smart cities, and wearable devices. Among these, industrial IoT sensors (such as pressure sensors, humidity sensors, thermometers, motion sensors, accelerometers, and actuators) have lower requirements than URLLC / eMBB in terms of reliability, performance, device size, cost, and battery life, but higher requirements than LPWA (i.e., LTE-M / NB-IoT). Smart monitoring in smart cities enables vertical data collection and processing to more effectively monitor and control urban resources and provide services to urban residents. Wearable device use cases include smartwatches, wristbands, eHealth-related devices, and medical monitoring equipment.

[0003] New IoT devices (Reduced Capability UEs, or RedCap UEs for short) have significantly reduced bandwidth compared to traditional NR UEs. However, as IoT devices, RedCap UEs are numerous within a cell, placing a heavy load on the limited radio resources allocated to the Bandwidth Part (BWP). The reduced complexity of RedCap UEs, such as the reduced number of antennas, impacts coverage. To improve coverage, the network transmits at low bit rates or using retransmission techniques on the broadcast channel. This application, coupled with the large number of RedCap UEs, further exacerbates the load on the initial bandwidth portion, a problem that current technologies have not yet solved. Summary of the Invention

[0004] This application discloses a partial bandwidth switching method, and a communication network system, base station, and user equipment using this method. The partial bandwidth switching method enables at least one base station in the network system to communicate with at least one user equipment through at least a portion of the bandwidth. Firstly, in the embodiment of Scheme 1, a partial bandwidth switching method initiated by the base station is described. The base station and the user equipment perform a random access procedure. Then, the base station selects a target partial bandwidth based on an inactive channel state of at least one inactive partial bandwidth. Finally, the base station transmits a switching instruction to the user equipment, causing the user equipment to switch to the target partial bandwidth.

[0005] Generally, random access procedures use a common portion of bandwidth, also known as the initial portion bandwidth. The target portion bandwidth is one of the dedicated portion bandwidths selected from all inactive dedicated portion bandwidths. This embodiment reduces the burden on the initial portion bandwidth through an innovative handover procedure.

[0006] The base station can decide whether to switch a portion of the bandwidth based on the current channel state of at least one current portion of the bandwidth. The base station selects the target portion of the bandwidth only after deciding to switch. First, the base station obtains the current channel state. Specifically, the base station can actively trigger a measurement procedure to obtain the current channel state by collecting channel-related information reported to the base station by user equipment after measurement, in addition to statistically analyzing user number-related information.

[0007] If the base station determines that the current channel conditions are poor, it will decide to switch some bandwidth.

[0008] The current channel state can be a combination of one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio (SNR), reference signal reception quality, reference signal reception energy, channel quality indication, or any factor related to channel quality. A poorer condition can be a combination of one or more of the following: the number of accessing users in the current portion of the bandwidth is greater than one number of users, the number of users in connected state is greater than one value, the SNR is lower than a threshold, the reference signal reception quality is lower than a quality level, the reference signal reception energy is lower than an energy level, and the channel quality indication is lower than an exponential level.

[0009] In one embodiment, the inactive channel state can be obtained by the base station triggering a measurement procedure before deciding whether to switch a portion of the bandwidth, or by the base station buffering the previous measurement result. The base station can first determine whether at least one downlink inactive portion of the bandwidth is bound to a Synchronization Signal Block (SSB) resource before deciding whether to switch the portion of the bandwidth. Similarly, the base station can also determine whether at least one uplink inactive portion of the bandwidth is bound to a Physical Random Access Channel (PRACH) resource to decide whether to switch the uplink portion of the bandwidth.

[0010] In another embodiment, the random access procedure can be a contention-based random access. The base station sends the handover indication to the user equipment only after a contention conflict is successfully resolved. When sending the handover indication to the user equipment, the base station can use a first active uplink partial bandwidth identifier, a default uplink partial bandwidth identifier, or a custom field to carry an uplink partial bandwidth handover indication, wherein a target uplink partial bandwidth is defined. Conversely, the base station can use a first active downlink partial bandwidth identifier, a default downlink partial bandwidth identifier, or a custom field to carry a downlink partial bandwidth handover indication, wherein a target downlink partial bandwidth is defined. The handover indication can be carried by a conflict resolution information MSG4 in the random access procedure.

[0011] In another embodiment, the random access procedure can be a contention-free random access procedure. The base station carries the handover indication in a random access response and transmits the random access response to the user equipment. The user equipment can either immediately switch to the target portion of the bandwidth after the random access procedure is completed, or it can start a timer and switch to the target portion of the bandwidth after the timer expires. The base station can specify the duration of the timer, which is carried in the handover indication and transmitted to the user equipment. The duration of the timer can also be customized by the user equipment.

[0012] The inactive channel state may include a combination of one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received energy, channel quality indication, and factors related to channel quality.

[0013] The base station may select the target bandwidth portion only when it determines that the inactive channel state meets at least one preferred condition. The inactive channel state includes a combination of one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio (SNR), reference signal reception quality, reference signal reception energy, channel quality indication, or any factor related to channel quality. The preferred condition may be one of the following: the number of accessing users in at least one inactive bandwidth is less than a certain number of users; the number of users in connected state is less than a certain value; the SNR is higher than a threshold; the reference signal reception quality is higher than a certain quality; the reference signal reception energy is lower than a certain energy; or the channel quality indication is higher than an exponential value.

[0014] In one embodiment, before performing the random access procedure, the base station may send a measurement command to cause the user equipment to report the inactive channel state. The inactive channel state may also be information historically retained by the base station, or information reported by other user equipment in the same cell.

[0015] In another embodiment, the base station may determine the next-downlink target bandwidth only after determining that at least one downlink inactive portion of the bandwidth is bound to an SSB resource. Conversely, the base station may determine an uplink target bandwidth only after determining whether at least one uplink inactive portion of the bandwidth is bound to a PRACH resource.

[0016] As a particular embodiment, the handover indication can be a type of non-service scheduling downlink control information (DCI), which is a simplified information that does not involve the allocation of transmission resources.

[0017] This application also discloses a second approach: a partial bandwidth handover method initiated by a user equipment (UE), and a communication network system and UE involved in this approach. The UE can form a communication network system with at least one base station and communicate through at least a portion of the bandwidth. Given that the UE and the base station are already in an RRC connection state, the UE selects a target partial bandwidth based on an inactive channel state of at least one inactive partial bandwidth. After selection, the UE switches to the target partial bandwidth. The establishment of the RRC connection state can be achieved through a random access procedure, as detailed later.

[0018] Generally, each user equipment (UE) activates only one portion of bandwidth to communicate with the base station. Besides the initial / shared portion of bandwidth used for random access procedures, there are typically three or four dedicated portions of bandwidth available for activation. The term "inactive portion of bandwidth" in this application refers to all inactive portions of bandwidth, not limited to initial, shared, or dedicated portions. More specifically, these various types of bandwidth are further divided into uplink and downlink, and the switching mechanism depends on the communication system; it can be performed separately or in pairs.

[0019] The user equipment can decide whether to switch a portion of the bandwidth based on the current channel state of at least one current portion of the bandwidth. Only after deciding to switch the portion of the bandwidth will it determine and switch to the target portion of the bandwidth.

[0020] In one embodiment, after selecting the target portion of the bandwidth, the user equipment first requests permission from the base station. Only after obtaining permission from the base station does the user equipment switch to the target portion of the bandwidth.

[0021] The user equipment can first determine whether the condition of at least one current channel is poor before deciding to switch part of the bandwidth. The criteria for determining whether the condition of at least one current channel is poor are the same as those described in Scheme 1.

[0022] The user equipment can receive the current channel state acquired by the base station via broadcast and / or a dedicated RRC channel. The user equipment can also actively measure the inactive channel state before deciding whether to switch a portion of the bandwidth.

[0023] In another embodiment, the switching of uplink and downlink bandwidth can be determined separately. For example, the user equipment (UE) can decide to switch bandwidth only after determining that at least one downlink inactive bandwidth is bound to an SSB resource. Specifically, the UE and the base station can first perform a random access procedure. The base station can carry an SSB indication in this random access procedure step to indicate whether a dedicated downlink bandwidth is bound to an SSB resource, and the UE can decide whether to switch downlink bandwidth based on the SSB indication. Similarly, in the uplink portion, the base station can carry a PRACH indication in this random access procedure step to indicate whether an inactive uplink bandwidth is bound to a PRACH resource. The UE can decide whether to switch uplink bandwidth based on the PRACH indication.

[0024] The user equipment can first determine whether the inactive channel state is favorable before selecting the target bandwidth. The inactive channel state and the criteria for determining favorable conditions are the same as those described in Scheme 1, and will not be repeated here.

[0025] As another embodiment, the selection of uplink and downlink target bandwidth portions can be performed separately. For example, the base station may carry an SSB indication during the random access procedure step to indicate whether a downlink dedicated bandwidth portion is bound to an SSB resource. The user equipment can then select a downlink target bandwidth portion based on the SSB indication. Conversely, the user equipment can determine whether at least one uplink inactive bandwidth portion is bound to a PRACH resource to select an uplink target bandwidth portion.

[0026] After the user equipment switches to the target bandwidth portion, it can initiate an RRC message to the base station, reporting a portion of the bandwidth identifier of the target bandwidth portion to the base station. This RRC message can be an RRC connection re-establishment request, reported to the base station via MSG3; or it can be a custom control signaling that reports the bandwidth identifier of this portion to the base station at any time.

[0027] The inactive channel state mentioned in this solution can be the result of the previous measurement cached by the user equipment, or it can be obtained by the user equipment performing the measurement under the notification of the base station.

[0028] Furthermore, when selecting the target portion of bandwidth, the base station can first determine whether at least one downlink inactive portion of bandwidth is bound to PRACH resources in order to decide how to select the target portion of bandwidth.

[0029] Finally, the methods described in the above embodiments can be further integrated into a communication network system, a base station, and a user equipment. Therefore, the present invention also proposes corresponding embodiments.

[0030] An embodiment of the communication network system includes a base station and at least one user, with the devices communicating through at least a portion of the bandwidth. This communication network system can implement the partial bandwidth switching methods of Schemes 1 and 2 of the present invention.

[0031] In the communication network system of Scheme 1, the base station and the user equipment (UE) undergo a random access procedure. The base station then initiates a handover, selecting a target bandwidth based on the inactive channel state of at least one inactive bandwidth portion. Finally, the base station transmits a handover instruction to the UE, causing the UE to switch to the target bandwidth portion.

[0032] In the communication network system of Scheme 2, a random access procedure is not necessarily required. Its main characteristic is that the user equipment initiates the selection of a target bandwidth based on the inactive channel state of at least one inactive portion of the bandwidth. The user equipment then switches to the target bandwidth.

[0033] This application also discloses an embodiment of a base station, primarily based on Scheme 1. The base station can perform a random access procedure with the user equipment. The base station selects a target portion of bandwidth based on the inactive channel state of at least one inactive portion of bandwidth. The base station then transmits a handover instruction to the user equipment, causing the user equipment to switch to the target portion of bandwidth.

[0034] This application also discloses an embodiment of a user equipment, primarily based on Scheme 2, characterized in that the user equipment selects a target portion bandwidth based on an inactive channel state of at least one inactive portion bandwidth. The user equipment then switches to the target portion bandwidth.

[0035] Since the subsequent steps for the base station and user equipment in the aforementioned communication network system have been fully explained in some bandwidth switching methods, they will not be repeated here. Attached Figure Description

[0036] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of the structure of a communication network system 100 according to an embodiment of this application.

[0038] Figure 2 This is a flowchart illustrating part of the bandwidth switching method scheme 200 of this application.

[0039] Figure 3 This is a schematic diagram of a contention-based random access procedure 300 in a portion of the bandwidth switching method of this application embodiment.

[0040] Figure 4 This is a schematic diagram of a non-contention-based random access procedure 400 in a partial bandwidth switching method provided in an embodiment of this application.

[0041] Figure 5 This is a flowchart illustrating a partial bandwidth switching method scheme 2 500 provided in an embodiment of this application.

[0042] Figure 6 This is a flowchart 600 illustrating the process of determining whether to switch according to an embodiment of this application.

[0043] Figure 7 This is a flowchart 700 illustrating the selection of a target portion of bandwidth in an embodiment of this application. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Figure 1 This is a schematic diagram of the communication network system 100. The communication network system 100 includes a base station (BS) 110 and user equipment (UE) 120. The base station 110 can include various forms of macro base stations, micro base stations, relay stations, access points, etc. The user equipment 120 can be various IoT devices such as handheld devices, vehicle-mounted devices, and wearable devices with wireless communication capabilities, and may include a SIM card 130 for connecting to the base station 110. The base station 110 and the user equipment 120 can also be connected via air interface technology (such as NR UU).

[0046] In 5G NR, the bandwidth of user equipment 120 can be dynamically changed. When the traffic volume is large, the system allocates most of the bandwidth to user equipment 120, and when the traffic volume is small, the system allocates a small portion of the bandwidth to user equipment 120.

[0047] The bandwidth is mainly divided into two categories: initial downlink bandwidth and dedicated downlink bandwidth. Initial downlink bandwidth is primarily used for receiving system information (RMSI) and initiating random access. It carries signaling such as paging, Physical Random Access Channel (PRACH), and Radio Resource Control (RRC). The load on the initial downlink bandwidth increases with the number of user equipment (UFI) devices. Dedicated downlink bandwidth, on the other hand, is mainly used for data service transmission, and its bandwidth is generally larger than that of the initial downlink bandwidth. Uplink and downlink each have their own initial downlink bandwidth and dedicated downlink bandwidth.

[0048] In NR, the Physical Broadcast Channel (PBCH) carries System Information (MIB) to enable User Equipment 120 to obtain the most basic network messages and to notify User Equipment 120 of the time-frequency location information for receiving SIB1 (RMSI) messages. SIB1 (RMSI) is used to broadcast information such as the initial partial bandwidth and other necessary information for User Equipment 120 to access the network. In other words, the initial partial bandwidth, notified to User Equipment 120 via broadcast messages, is a shared bandwidth among all User Equipment 120 within the cell.

[0049] After obtaining uplink time synchronization with the base station through a random access procedure, User Equipment 120 initiates uplink and downlink data transmission. The random access procedure can be triggered by a series of events, such as initial access in RRC idle mode, RRC connection reconnection, and cell handover. During the uplink synchronization process, necessary system information and user equipment-specific configurations, such as uplink and downlink dedicated bandwidth configurations, can also be obtained. R15 / R16 NR user equipment supports four downlink dedicated bandwidths and four uplink dedicated bandwidths.

[0050] Figure 2 This is a schematic flowchart 200 of one of the bandwidth switching methods provided in this application, which can be used for reference. Figure 1 The main feature of Scheme 1 is that the handover of a portion of the bandwidth is controlled by the base station. First, in step 210, a base station and a user equipment initiate a random access procedure. Details of the random access procedure will be described later. In step 220, the base station selects a target portion of the bandwidth based on the inactive channel state of at least one inactive portion of the bandwidth. Next, in step 230, the base station transmits a handover instruction to the user equipment, causing the user equipment to handover to the target portion of the bandwidth. Finally, in step 240, the user equipment hands over to the target portion of the bandwidth according to the handover instruction.

[0051] Generally, random access procedures use a common portion of bandwidth, also known as the initial portion bandwidth. The target portion bandwidth is one of the dedicated portion bandwidths selected from all inactive dedicated portion bandwidths. A user equipment (UE) can only have one active portion bandwidth at a time, and the UE can only send and receive data on the active portion bandwidth. The active portion bandwidth can be either the initial portion bandwidth or a dedicated portion bandwidth. Besides the active portion bandwidth, other portion bandwidths configured by the UE are inactive portion bandwidths. If the active portion bandwidth is the initial portion bandwidth, then the inactive portion bandwidth is the dedicated portion bandwidth; conversely, if the active portion bandwidth is the dedicated portion bandwidth, then the inactive portion bandwidth can be either the initial portion bandwidth or a dedicated portion bandwidth. This embodiment achieves the goal of reducing the burden on the initial portion bandwidth through an innovative handover procedure. In other usage scenarios, the target portion bandwidth may also be the initial portion bandwidth. The handover method of this application does not limit the type of target portion bandwidth.

[0052] Figure 3The diagram illustrates an embodiment of a contention-based random access procedure. In step 302, User Equipment (UE) 310 sends a Random Access Preamble (MSG1) to Base Station (BS) 320, initiating a random access attempt. In step 304, Base Station 320 sends a Random Access Response (MSG2) back to UE 310. After detecting UE's Random Access Preamble (MSG1) and granting access, Base Station 320 estimates the transmission delay with UE, calibrates the uplink time accordingly, and then sends the Random Access Response (MSG2) back to UE.

[0053] When a contention occurs, steps 306 and 308 will implement a conflict resolution mechanism. In step 306, to resolve the contention conflict, user equipment 310 sends a third message MSG3 to base station 320 via PUSCH, including the user equipment's unique identifier. In step 308, base station 320 sends a fourth message MSG4 to user equipment as a conflict resolution message. In the conflict resolution mechanism, base station 320 carries the unique identifier of the winning user equipment in the fourth message MSG4 to designate the user equipment that won the contention. Base station 320 may also carry configuration information of user equipment 310's uplink and downlink dedicated bandwidth in the fourth message MSG4, which may include RACH (Random Access Channel) configuration information.

[0054] The industry generally refers to the third and fourth messages collectively as MSG3 and MSG4, rather than as a specific message, because these two messages may differ depending on the user equipment status and application scenario. In this embodiment, the fourth message MSG4, in addition to the uplink and downlink dedicated bandwidth configuration information that can be carried in existing mechanisms, can also add corresponding handover indications for either the uplink or downlink bandwidth. For example, an embodiment of the handover indication can be represented as an Information Element (IE) as follows, where two options, switchDownLinkBWP-ID and switchUpLinkBWP-ID, are added.

[0055] ServingCellConfig::=SEQUENCE{

[0056] …

[0057] firstActiveDownlinkBWP-Id BWP-Id OPTIONAL,

[0058] defaultDownlinkBWP-Id BWP-Id OPTIONAL,--Need S

[0059] swtichDownLinkBWP-ID BWP-Id OPTIONAL,

[0060] swtichUpLinkBWP-ID BWP-Id OPTIONAL,

[0061] …

[0062] }

[0063] In other words, this embodiment can obtain the conflict resolution message sent by the base station 320 during the contention-based random access process, which carries a handover instruction, so that the user equipment 310 can perform a partial bandwidth handover after receiving it.

[0064] Figure 4 This is an embodiment of the non-contention-based random access procedure of the present invention. In certain random access scenarios, the base station 320 can assign a specified random access preamble to the user equipment 310 as needed. Random access initiated in this way does not involve conflicts between user equipments, and the random access procedure is considered complete after the user equipment receives the random access response. In step 402, the base station 320 assigns a random access preamble to the user equipment 310. In step 404, the user equipment 310 sends a random access preamble to the base station 320. In step 406, the base station 320 sends a random access response back to the user equipment 310. In this embodiment, the random access response can be used to carry a handover indication. That is, in step 406 of the non-contention-based random access procedure, the base station 320 can send a handover indication in a random access response to the user equipment 310.

[0065] Figure 2 In the processes described in 3 and 4, the base station unconditionally performs partial bandwidth switching. However, the present invention can also pre-determine the channel state of the currently used partial bandwidth (generally the initial partial bandwidth) at the base station side before deciding whether to perform partial bandwidth switching. For example, in... Figure 3 Before step 304, or Figure 4 Before step 402, a decision must be made regarding whether to proceed. If yes, then proceed to the next step. If no, stop at the next step. Detailed procedures are available in [link to detailed process]. Figure 6 The details are as follows.

[0066] exist Figure 3 Step 308 or Figure 4In the embodiment of step 406, upon completion of random access, the user equipment can immediately initiate partial bandwidth switching. That is, the user equipment switches the initial partial bandwidth to the target partial bandwidth according to the identification code of the target partial bandwidth in a switching instruction. In other words, the user equipment sets the target partial bandwidth to an active state and begins using it for communication. In another embodiment, the user equipment can also delay for a preset duration before initiating partial bandwidth switching, such as by starting a timer and initiating partial bandwidth switching when the timer expires. The timeout duration of the timer is set to a preset duration, which can be specified by the base station, such as by the base station carrying the preset duration information in MSG4 or broadcast messages, or the preset duration can be defined and set by the user equipment itself.

[0067] As a specific embodiment, the handover indication can be a non-service scheduling DCI, which is a simplified message that does not involve the allocation of transmission resources. This allows the user equipment to be notified of a switch from the active portion of bandwidth to other portions of bandwidth with minimal communication cost via a simple DCI instruction. The DCI can be a new formatted DCI, or it can be an existing DCI with an added field to indicate the partial bandwidth switch.

[0068] Figure 5 This is a flowchart of a partial bandwidth switching method according to a second embodiment of the present invention. The main feature of the second embodiment is that the partial bandwidth switching is controlled by the user equipment. First, in step 510, a random access procedure is performed between the user equipment and the base station. Generally, the current partial bandwidth used by the random access procedure is either the standard initial partial bandwidth or the shared partial bandwidth. In this embodiment, the initial partial bandwidth can be switched to one of the inactive dedicated partial bandwidths.

[0069] In some implementations, step 510 is not a necessary step. For example, in an already connected system, if there is a need to switch from an active dedicated portion bandwidth to an inactive dedicated portion bandwidth, the process can proceed directly from step 520. In this case, the current portion bandwidth refers to the active dedicated portion bandwidth.

[0070] In step 520, the user equipment selects a target portion bandwidth based on an inactive channel state of at least one inactive portion bandwidth. Generally, the target portion bandwidth is further subdivided into uplink and downlink, which can be determined separately or simultaneously. Details will be described later. The determined target portion bandwidth, as mentioned above, is in most cases the dedicated portion bandwidth, but in a few cases it can also be the initial portion bandwidth. Finally, in step 530, the user equipment switches to the target portion bandwidth.

[0071] Figure 6 This is an example of determining the current channel state. Figure 2 and Figure 5 Some bandwidth switching steps, which were originally unconditional, can be further combined with... Figure 6 After assessing the current channel status, a decision will be made regarding whether to proceed. Figure 2 or Figure 5 The steps. In short, in this embodiment, only when... Figure 6 After the implementation plan determines to switch a portion of the bandwidth, Figure 2 and Figure 5 The following steps will then occur. The so-called current portion bandwidth typically refers to the common portion bandwidth used in the random access procedure, i.e., the initial portion bandwidth. Conversely, the target portion bandwidth is the portion of bandwidth selected from the inactive proprietary portion bandwidth for subsequent communication. More specifically, uplink and downlink communication use different portion bandwidths, and their determination and selection steps can be performed simultaneously or separately; this embodiment applies both without limitation. In some usage scenarios, the so-called current portion bandwidth can also be the proprietary portion bandwidth currently being used by the user equipment, while the target portion bandwidth is the inactive initial portion bandwidth or other proprietary portion bandwidth. The switching method provided by this invention can be applied in all cases and is not limited to the types of current and target portion bandwidths.

[0072] First, in step 610, the base station or user equipment obtains the current channel state. Regarding the method of obtaining the current channel state, [the following is provided]. Figure 2 For example, this could be obtained by the base station itself measuring the current portion of the bandwidth. Figure 5 For example, the user equipment may receive the current channel status measured by the base station through broadcast and / or a dedicated RRC channel.

[0073] In step 620, the current channel state is compared with a worse condition. If the current channel state is worse than the worse condition, then in step 630, [further steps are taken]. Figure 2 or Figure 5 The step of switching a portion of the bandwidth is described above. Conversely, if the current channel conditions are favorable, there is no need to switch. As described in step 640, no portion of the bandwidth is switched. Figure 6 The timing of determining the current channel state is not limited by the execution order. Figure 2 or Figure 5 It can be performed before or after the random access procedure, or it can be performed during the random access procedure.

[0074] The aforementioned current channel state can be a combination of the following factors: the number of connected users, the number of users in RRC connected state, noise floor, signal-to-noise ratio (SINR), reference signal received quality (RSRQ), reference signal received power (RSRP), channel quality indication (CQI), or any factor related to channel quality. Any consideration of any of the above factors is within the scope of this invention.

[0075] The aforementioned poor conditions can be a combination of the following factors: the number of users accessing the current portion of the bandwidth is greater than one number of users, the number of users in a connected state is greater than one value, the signal-to-noise ratio is lower than a threshold, the reference signal reception quality is lower than a quality level, the reference signal reception energy is lower than an energy level, and the channel quality indicator is lower than an index. Any consideration of any of the above factors is within the scope of this invention. The thresholds, quality, energy, and indexes mentioned above refer to reference values ​​that can be used to judge the quality of conditions. Examples of their actual values ​​can refer to currently operating standard default values ​​or any operable custom values; this disclosure does not specifically limit their scope.

[0076] In step 530, the user equipment can unconditionally switch to the target portion of the bandwidth. Alternatively, after selecting the target portion of the bandwidth in step 520, the user equipment will first request permission from the base station. The user equipment will wait until it receives permission from the base station before proceeding to step 530 and switching to the target portion of the bandwidth.

[0077] Figure 7 This is an example of selecting a specific portion of the bandwidth. Regarding... Figure 2 and Figure 5 The method of selecting the target portion of bandwidth can be further refined in... Figure 7 The explanation is as follows. First, in step 710, the states of all selectable inactive channels are obtained. Figure 2 In this embodiment, the acquisition of the inactive channel state can be achieved by broadcasting the measurement configuration to the user equipment (UE) before the random access procedure, followed by the UE measuring and reporting it to the base station, or by the base station using historically retained information or information reported by other UEs in the cell. Figure 5 For example, the inactive channel status can be obtained by the user equipment actively measuring it before deciding whether to switch a portion of the bandwidth.

[0078] The target bandwidth is selected from all available inactive channel states that meet specific state conditions. Therefore, in step 720, it is determined whether these inactive channel states meet at least one preferred condition. If an inactive channel state meets the preferred condition, it is selected as the target bandwidth in step 730. If multiple inactive channel states simultaneously meet the preferred condition, one can be randomly selected, or the one with the best condition can be chosen as the target bandwidth. Conversely, if no inactive channel state meets the preferred condition, no further steps are performed.

[0079] The inactive channel state specifically includes a combination of the following factors: the number of accessing users, the number of users in the RRC connected state, noise floor, signal-to-noise ratio (SNR), reference signal reception quality, reference signal reception energy, channel quality indication, and any factors related to channel quality. Preferred conditions may include a combination of the following factors: the number of accessing users in at least one inactive portion of the bandwidth is less than a certain number of users, the number of users in the connected state is less than a certain value, the SNR is higher than a threshold, the reference signal reception quality is higher than a certain quality, the reference signal reception energy is lower than a certain energy, or the channel quality indication is higher than an exponential value, etc. Any consideration of any of the above factors is within the scope of this invention.

[0080] Step 710 is applied in Figure 2 In this embodiment, the aforementioned inactive channel state may be a previous measurement result cached by the user equipment. Alternatively, the inactive channel state may be obtained by the user equipment performing a measurement upon notification from the base station. If step 710 is applied to... Figure 5 In this context, the inactive channel state can also be obtained by active measurement by the user equipment.

[0081] The step of selecting a target bandwidth in the above embodiments can be further subdivided into uplink and downlink, as uplink and downlink each have different bandwidth components. For Frequency Division Duplexing (FDD) systems, with a few exceptions, uplink and downlink bandwidths can generally be switched separately. For Time Division Duplexing (TDD) systems, uplink and downlink bandwidths need to be paired. For example, the base station can use a first active uplink bandwidth identifier (firstActiveUplinkBWP-Id), a default uplink bandwidth identifier (defaultUplinkBWP-Id), or a custom field carrying an uplink bandwidth switching indication. This uplink bandwidth switching indication defines a target uplink bandwidth. Conversely, in the downlink portion, the base station can use a first active downlink bandwidth identifier (firstActiveDownlinkBWP-Id), a default downlink bandwidth identifier (defaultDownlinkBWP-Id), or a custom field carrying a downlink bandwidth switching indication. This downlink bandwidth switching indication defines a target downlink bandwidth. Similar to the aforementioned implementation of determining whether to switch, when selecting the target bandwidth for uplink and downlink, different factors of the uplink and downlink channels can be further considered separately.

[0082] Deciding whether to switch a portion of the bandwidth, or selecting the target portion of the bandwidth, can be further considered by taking into account different factors of the uplink and downlink channels separately. For example, if the downlink portion of the bandwidth after the switch in step 530 has no SSB, the user equipment will need to trigger RF returning when necessary, switching back to the initial downlink portion of the bandwidth for synchronization, radio resource management (RRM) measurements, and other operations. This process also places a burden on the system. Therefore, whether the downlink portion of the bandwidth is bound to SSB resources depends on the configuration on the base station side and can be considered as a factor for switching or selection. Similarly, for the uplink channel state, whether it is bound to PRACH resources can also be considered as a factor for switching or selection.

[0083] Figure 2 and Figure 5 The embodiments can further incorporate the step of determining SSB resources to decide whether to perform a switch of downlink bandwidth. For example, by Figure 2 base stations or Figure 5The user equipment determines whether an SSB resource is bound to the inactive portion of the downlink bandwidth. If an SSB resource is found, the downlink bandwidth is switched. Otherwise, no switching occurs. In some scenarios, the condition for whether to switch can be reversed: if an SSB resource is found, no switching occurs; if not, switching occurs. This embodiment of the invention does not limit the correlation between the determination result and whether switching occurs.

[0084] As for determining whether the downlink inactive bandwidth is bound to an SSB resource, the base station can include an SSB indication in the random access procedure to indicate whether the dedicated downlink bandwidth is bound to an SSB resource. For example, the base station can add an indication of whether each dedicated downlink bandwidth has an SSB (e.g., a value of 0: no SSB; 1: SSB present) to the MSG4 message during the random access procedure. The user equipment can then directly decide whether to switch the bandwidth based on this SSB indication after the random access procedure.

[0085] On the other hand, when selecting the downlink target bandwidth, the binding status of the SSB can also be considered. This SSB indication is carried by the base station during the random access procedure, and the user equipment can directly select the downlink target bandwidth based on this SSB indication. Depending on the scenario requirements, sometimes the downlink inactive bandwidth without an SSB is selected as the downlink target bandwidth, and sometimes the inactive bandwidth with a bound SSB is selected as the target bandwidth. The specific implementation is not limited to this.

[0086] Similar to the aforementioned embodiments, Figure 2 or Figure 5 In some embodiments, it can be further determined whether at least one inactive uplink bandwidth is bound to PRACH resources to decide whether to perform uplink bandwidth switching or select a target uplink bandwidth. The base station carries a PRACH indication in the random access procedure step, and the user equipment can decide whether to perform uplink bandwidth switching or select a target uplink bandwidth based on the PRACH indication. Depending on the scenario requirements, sometimes an inactive uplink bandwidth without PRACH resources is selected as the target bandwidth, and sometimes an inactive uplink bandwidth with PRACH resources is selected as the target bandwidth. Specific implementations are not limited to this.

[0087] After a user equipment (UE) switches to the target bandwidth portion, it can initiate an RRC message to the base station, reporting a portion of the bandwidth identifier of that target bandwidth to the base station. This enables the base station to maintain correct communication with the UE. The RRC message can be an RRC connection re-establishment request, reported to the base station via MSG3; or it can be a custom control signaling that reports the bandwidth identifier to the base station at any time.

[0088] Finally, the methods described in the above embodiments can be further integrated into a communication network system, a base station, and a user equipment, corresponding to the following embodiments.

[0089] An embodiment of the communication network system includes a base station and at least one user, with the devices communicating through at least a portion of the bandwidth. This communication network system can implement the partial bandwidth switching methods of Schemes 1 and 2 of the present invention.

[0090] In the communication network system of Scheme 1, refer to Figure 1 , 2 3, 4, 6, and 7, the base station and the user equipment perform a random access procedure. Then, the base station initiates a handover, selecting a target portion of the bandwidth based on the state of an inactive channel within at least one inactive portion of the bandwidth. Finally, the base station transmits a handover instruction to the user equipment, causing the user equipment to switch to the target portion of the bandwidth.

[0091] In the communication network system of Scheme 2, refer to Figure 1 , 5 In steps 6 and 7, firstly, a random access procedure is performed between the base station and the user equipment. Then, initiated by the user equipment, a target portion of bandwidth is selected based on the inactive channel state of at least one inactive portion of the bandwidth. Finally, the user equipment switches to the target portion of the bandwidth.

[0092] In the above-described embodiments of the base station, reference is made to... Figure 1 , 2 3, 4, 6, and 7, the base station can perform a random access procedure with the user equipment. Initiated by the base station, a target portion of bandwidth is selected based on the inactive channel state of at least one inactive portion of bandwidth. The base station then transmits a handover instruction to the user equipment, causing the user equipment to switch to the target portion of bandwidth.

[0093] In the above-described embodiments of the user equipment, reference is made to... Figure 1 , 5 Steps 6 and 7 involve the following steps: First, a random access procedure is performed between the user equipment and the base station. Next, the user equipment selects a target portion of the bandwidth based on the state of an inactive channel within at least one inactive portion of the bandwidth. Finally, the user equipment switches to the target portion of the bandwidth.

[0094] Due to the aforementioned communication network system, subsequent related steps for base stations and user equipment have already been completed. Figures 1 to 7 The embodiments are described in detail and have been well supported, so they will not be repeated here.

[0095] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor. Therefore, embodiments of the present invention provide a storage medium storing multiple instructions that can be loaded by a processor to execute the steps in any of the partial bandwidth switching methods provided in the embodiments of the present invention.

[0096] Since the instructions stored in the storage medium can execute the steps of any partial bandwidth switching method provided in the embodiments of the present invention, the beneficial effects that any partial bandwidth switching method provided in the embodiments of the present invention can achieve can be realized, as detailed in the preceding embodiments, and will not be repeated here.

[0097] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0098] In summary, although the present application has disclosed the preferred embodiments as described above, the above preferred embodiments are not intended to limit the present application. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be determined by the scope defined in the claims.

Claims

1. A partial bandwidth switching method, performed by a base station, enabling at least one user equipment to communicate through at least a portion of the bandwidth. Initiate a random access procedure; A target portion bandwidth is selected based on the state of an inactive channel, at least one inactive portion bandwidth; and Transmit a handover instruction to the user equipment, causing the user equipment to switch to the target portion of the bandwidth, characterized in that: The random access procedure is a contention-free random access procedure in which the base station carries the handover indication in a random access response and transmits the random access response to the user equipment.

2. The partial bandwidth switching method as described in claim 1, characterized in that: Further includes: Whether to switch a portion of the bandwidth is determined based on the current channel state of at least one current portion of the bandwidth. as well as The target bandwidth portion is selected only after the decision to switch to a specific portion of the bandwidth has been made.

3. The partial bandwidth switching method as described in claim 2, characterized in that: Further includes: The base station obtains the current channel state by referring to its own user-related information and the channel-related information reported to the base station by the user equipment.

4. The partial bandwidth switching method as described in claim 2, characterized in that: The steps for deciding whether to switch a portion of the bandwidth include: the base station determining whether the current channel state meets a poor condition; wherein: The current channel state includes a combination of one or more of the following: the number of accessing users, the number of users in Radio Resource Control (RRC) connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received power, channel quality indication, and factors related to channel quality; and The poor condition includes a combination of one or more of the following: the number of access users in the current portion of the bandwidth is greater than one number of users, the number of connected users is greater than one value, the signal-to-noise ratio is lower than a threshold, the reference signal reception quality is lower than a quality, the reference signal reception energy is lower than an energy, and the channel quality indicator is lower than an index.

5. The partial bandwidth switching method as described in claim 2, characterized in that: The inactive channel state is obtained by the base station triggering a measurement procedure before deciding whether to switch a portion of the bandwidth, or by the base station caching the previous measurement result.

6. The partial bandwidth switching method as described in claim 2, characterized in that: The steps for deciding whether to switch a portion of the bandwidth include: the base station determining whether at least one downlink inactive portion of the bandwidth is bound to a Synchronization Signal Block (SSB) resource, in order to decide whether to switch the downlink portion of the bandwidth.

7. The partial bandwidth switching method as described in claim 2, characterized in that: The steps for deciding whether to switch uplink bandwidth include: the base station determining whether at least one inactive uplink bandwidth is bound to a Physical Random Access Channel (PRACH) resource, in order to decide whether to switch uplink bandwidth.

8. The partial bandwidth switching method as described in claim 1, characterized in that: Further includes: After the random access procedure is completed, the user equipment starts a timer. After the timer expires, it switches to the target portion of the bandwidth.

9. The partial bandwidth switching method as described in claim 8, characterized in that, Further includes: The base station specifies the duration of the timer, which is then transmitted to the user equipment via the handover instruction.

10. The partial bandwidth switching method as described in claim 8, characterized in that, Further includes: The user equipment can customize the duration of this timer.

11. The partial bandwidth switching method as described in claim 1, characterized in that, The inactive channel state includes one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received energy, channel quality indication, and factors related to channel quality.

12. The partial bandwidth switching method as described in claim 11, characterized in that: The step of selecting the target portion of the bandwidth includes: the base station determining whether the inactive channel state meets at least one preferred condition; wherein: The inactive channel state includes a combination of one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received power, channel quality indication, and factors related to channel quality; and The at least one preferred condition includes one of the following: the number of access users in at least one inactive portion of the bandwidth is less than one number of users, the number of users in the connected state is less than one value, the signal-to-noise ratio is higher than a threshold, the reference signal reception quality is higher than a quality, the reference signal reception energy is higher than an energy, or the channel quality indication is higher than an index.

13. The partial bandwidth switching method as described in claim 1, characterized in that, Further includes: Before the random access procedure, the base station sends a measurement command to cause the user equipment to report the status of the inactive channel.

14. The partial bandwidth switching method as described in claim 1, characterized in that: The inactive channel status is information reported by the base station through historically retained information or other user equipment in the same cell.

15. The partial bandwidth switching method as described in claim 1, characterized in that: The steps for selecting the target portion of bandwidth include: the base station determining whether at least one downlink inactive portion of bandwidth is bound to an SSB resource in order to select the target portion of downlink bandwidth.

16. The partial bandwidth switching method as described in claim 1, characterized in that: The step of selecting the target portion of bandwidth includes: the base station determining whether at least one inactive uplink portion of bandwidth is bound to a PRACH resource in order to determine a target portion of uplink bandwidth.

17. The partial bandwidth switching method as described in claim 1, characterized in that: The handover indication is a non-service scheduling control information (DCI) that does not involve the allocation of transmission resources.

18. A communication network system comprising at least one base station and at least one user equipment communicating through at least a portion of bandwidth; wherein: The base station and the user equipment undergo a random access procedure; The base station selects a target portion of bandwidth based on the state of an inactive channel, which is at least one inactive portion of the bandwidth. as well as The base station transmits a handover instruction to the user equipment, causing the user equipment to switch to the target portion of the bandwidth; The feature is that the random access procedure is a contention-free random access, and the base station carries the handover indication in a random access response and transmits the random access response to the user equipment.

19. The communication network system of claim 18, further comprising: The base station determines whether to switch a portion of the bandwidth based on a current channel state of at least one current portion of the bandwidth. as well as The base station selected the target bandwidth only after deciding to switch to a portion of the bandwidth.

20. The communication network system as described in claim 19, characterized in that: The base station obtains the current channel state by referring to its own user-related information and the channel-related information reported to the base station by the user equipment.

21. The communication network system as described in claim 19, characterized in that: When the base station decides whether to switch a portion of the bandwidth, it determines whether the current channel state meets a poor condition; where: The current channel state includes one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received power, channel quality indication, and factors related to channel quality; and The poor condition includes a combination of one or more of the following: the number of access users in the current portion of the bandwidth is greater than one number of users, the number of connected users is greater than one value, the signal-to-noise ratio is lower than a threshold, the reference signal reception quality is lower than a quality, the reference signal reception energy is lower than an energy, and the channel quality indicator is lower than an index.

22. The communication network system as described in claim 19, characterized in that... The inactive channel state is obtained by the base station triggering a measurement procedure before deciding whether to switch a portion of the bandwidth, or by the base station caching the previous measurement result.

23. The communication network system as described in claim 19, characterized in that... When deciding whether to switch a portion of the bandwidth, the base station determines whether at least one of the downlink inactive bandwidths is bound to an SSB resource to decide whether to switch the downlink bandwidth.

24. The communication network system as described in claim 19, characterized in that... When deciding whether to switch uplink bandwidth, the base station determines whether at least one inactive uplink bandwidth is bound to a PRACH resource to decide whether to switch uplink bandwidth.

25. The communication network system as described in claim 18, characterized in that: After the random access procedure is completed, the user equipment starts a timer. After the timer expires, it switches to the target portion of the bandwidth.

26. The communication network system as described in claim 25, characterized in that, The base station specifies the duration of the timer, which is then transmitted to the user equipment via the handover instruction.

27. The communication network system as described in claim 25, characterized in that, The user equipment can customize the duration of this timer.

28. The communication network system as described in claim 18, characterized in that, The inactive channel state includes one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received energy, channel quality indication, and factors related to channel quality.

29. The communication network system as described in claim 28, characterized in that: When selecting the target bandwidth, the base station determines whether the inactive channel state meets at least one preferred condition; wherein: The inactive channel state includes a combination of one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received power, channel quality indication, and factors related to channel quality; and The at least one preferred condition includes one of the following: the number of access users in at least one inactive portion of the bandwidth is less than one number of users, the number of users in the connected state is less than one value, the signal-to-noise ratio is higher than a threshold, the reference signal reception quality is higher than a quality, the reference signal reception energy is higher than an energy, or the channel quality indication is higher than an index.

30. The communication network system as described in claim 18, characterized in that... Further includes: Before the random access procedure, the base station sends a measurement command to cause the user equipment to report the status of the inactive channel.

31. The communication network system as described in claim 18, characterized in that... The inactive channel status is information reported by the base station through historically retained information or other user equipment in the same cell.

32. The communication network system as described in claim 18, characterized in that: When the base station selects the target bandwidth portion, it determines whether at least one downlink inactive bandwidth portion is bound to an SSB resource in order to select the target downlink bandwidth portion.

33. The communication network system as described in claim 18, characterized in that: When the base station selects the target bandwidth portion: it determines whether at least one inactive uplink bandwidth portion is bound to a PRACH resource in order to select a target uplink bandwidth portion.

34. The communication network system as described in claim 18, characterized in that... The handover indication is a non-service scheduling DCI, which does not involve the allocation of transport resources.

35. A base station capable of communicating with at least one user equipment through at least a portion of its bandwidth. The base station and the user equipment undergo a random access procedure; The base station selects a target portion of bandwidth based on the state of an inactive channel, at least one inactive portion of the bandwidth; and The base station transmits a handover instruction to the user equipment, causing the user equipment to switch to the target portion of the bandwidth; Its features are: The random access procedure is a non-contention-based random access procedure; and The base station carries the handover indication in a random access response and transmits the random access response to the user equipment.

36. The base station as described in claim 35, further comprising: The base station determines whether to switch a portion of the bandwidth based on a current channel state of at least one current portion of the bandwidth. as well as The base station selected the target bandwidth only after deciding to switch to a portion of the bandwidth.

37. The base station as described in claim 36, characterized in that: The base station obtains the current channel state by referring to its own user-related information and the channel-related information reported to the base station by the user equipment.

38. The base station as described in claim 36, characterized in that: When the base station decides whether to switch a portion of the bandwidth, it determines whether the current channel state meets a poor condition; where: The current channel state includes one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received power, channel quality indication, and factors related to channel quality; and The poor condition includes a combination of one or more of the following: the number of access users in the current portion of the bandwidth is greater than one number of users, the number of connected users is greater than one value, the signal-to-noise ratio is lower than a threshold, the reference signal reception quality is lower than a quality, the reference signal reception energy is lower than an energy, and the channel quality indicator is lower than an index.

39. The base station as described in claim 36, characterized in that... The inactive channel state is obtained by the base station triggering a measurement procedure before deciding whether to switch a portion of the bandwidth, or by the base station caching the previous measurement result.

40. The base station as described in claim 36, characterized in that... When deciding whether to switch a portion of the bandwidth, the base station determines whether at least one of the downlink inactive bandwidths is bound to an SSB resource in order to decide whether to switch the downlink bandwidth.

41. The base station as described in claim 36, characterized in that... When deciding whether to switch uplink bandwidth, the base station determines whether at least one inactive uplink bandwidth is bound to PRACH resources to decide whether to switch uplink bandwidth.

42. The base station as described in claim 35, characterized in that: After the random access procedure is completed, the user equipment starts a timer. After the timer expires, it switches to the target portion of the bandwidth.

43. The base station as described in claim 42, characterized in that, The base station specifies the duration of the timer, which is then transmitted to the user equipment via the handover instruction.

44. The base station as described in claim 42, characterized in that, The user equipment can customize the duration of this timer.

45. The base station as described in claim 35, characterized in that, The inactive channel state includes one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received energy, channel quality indication, and factors related to channel quality.

46. ​​The base station as described in claim 45, characterized in that: When selecting the target bandwidth, the base station determines whether the inactive channel state meets at least one preferred condition; wherein: The inactive channel state includes a combination of one or more of the following: the number of accessing users, the number of users in RRC connected state, noise floor, signal-to-noise ratio, reference signal received quality, reference signal received power, channel quality indication, and factors related to channel quality; and The at least one preferred condition includes one of the following: the number of access users in at least one inactive portion of the bandwidth is less than one number of users, the number of users in the connected state is less than one value, the signal-to-noise ratio is higher than a threshold, the reference signal reception quality is higher than a quality, the reference signal reception energy is higher than an energy, or the channel quality indication is higher than an index.

47. The base station as described in claim 35, characterized in that... Further includes: Before the random access procedure, the base station sends a measurement command to cause the user equipment to report the status of the inactive channel.

48. The base station as described in claim 35, characterized in that... The inactive channel status is information reported by the base station through historically retained information or other user equipment in the same cell.

49. The base station as described in claim 35, characterized in that: When the base station selects the target bandwidth portion, it determines whether at least one downlink inactive bandwidth portion is bound to an SSB resource in order to select the target downlink bandwidth portion.

50. The base station as described in claim 35, characterized in that: When the base station selects the target bandwidth portion: it determines whether at least one inactive uplink bandwidth portion is bound to a PRACH resource in order to select a target uplink bandwidth portion.

51. The base station as described in claim 35, characterized in that... The handover indication is a non-service scheduling DCI, which does not involve the allocation of transport resources.

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