Method and apparatus for random access

Abstract

Disclosed is a method for RA. An embodiment of the present application provides a method performed by user equipment, the method including transmitting a first type of message in a first uplink BWP if at least one second uplink bandwidth part (BWP) is not configured or is configured but deactivated, or transmitting the first type of message in the at least one second uplink BWP if the at least one second uplink BWP is configured and activated; and receiving a first type of response message, wherein the first uplink BWP is configured in system information block 1 (SIB1). Related devices are also disclosed.

Description

Technical Field

[0001] Various exemplary embodiments relate to methods and devices for random access. Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in addition to legacy user equipment (UE), various new types of UEs have emerged, such as industrial wireless sensors, video surveillance, wearable devices, etc. Different from legacy UEs (e.g., enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) UEs), these new types of UEs may have characteristics including, for example, a reduced number of receive / transmit antennas, reduced UE bandwidth, half frequency division duplex, relaxed UE processing time, relaxed UE processing capabilities, etc. These new types of UEs may be referred to as reduced-capability (RedCap) UEs. Summary of the Invention

[0003] An embodiment of the present application provides a method performed by a user equipment (UE), the method including transmitting a first type of message in a first UL bandwidth part (BWP) if a second uplink (UL) BWP is not configured or is configured but deactivated, or transmitting the first type of message in the second UL BWP if the second UL BWP is configured and activated; and receiving a first type of response message in a downlink (DL) BWP, wherein the first UL BWP is configured in system information block 1 (SIB1).

[0004] Another embodiment of the present application provides a method performed by a base station (BS), the method including receiving a first type of message in a first UL BWP if a second UL BWP is not configured or is configured but deactivated, or receiving the first type of message in the second UL BWP if the second UL BWP is configured and activated; and transmitting a first type of response message in a DL BWP, wherein the first UL BWP is configured by the BS.

[0005] Other embodiments of the present application provide a device, the device indicating: a non-transitory computer-readable medium having computer-executable instructions stored thereon; a receiving circuitry; a transmitting circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry, and the transmitting circuitry, wherein the computer-executable instructions cause the processor to implement a method performed by a UE. The method includes: if a second UL BWP is not configured or is configured but deactivated, then transmitting a first type of message in a first UL BWP, or if the second UL BWP is configured and activated, then transmitting the first type of message in the second UL BWP; and receiving a first type of response message in a DL BWP, wherein the first UL BWP is configured in SIB1.

[0006] Another other embodiment of the present application provides a device, the device indicating: a non-transitory computer-readable medium having computer-executable instructions stored thereon; a receiving circuitry; a transmitting circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry, and the transmitting circuitry, wherein the computer-executable instructions cause the processor to implement a method performed by a UE. The method includes: if a second UL BWP is not configured or is configured but deactivated, then receiving a first type of message in a first UL BWP, or if the second UL BWP is configured and activated, then receiving the first type of message in the second UL BWP; and transmitting a first type of response message in a DL BWP, wherein the first UL BWP is configured by the BS. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Some example embodiments will now be described by way of non-limiting examples with reference to the accompanying drawings.

[0008] Figure 1 Illustrate an exemplary method for random access (RA) according to some embodiments of the present disclosure.

[0009] Figure 2 Illustrate an exemplary signal sequence for RA according to some embodiments of the present disclosure.

[0010] Figure 3 Illustrate an exemplary handover indicator included in a media access control (MAC) sub-protocol data unit (PDU) according to some embodiments of the present disclosure.

[0011] Figure 4 Illustrate an exemplary method for RA according to some embodiments of the present disclosure.

[0012] Figure 5Describe exemplary signal sequences for RA according to some embodiments of the present disclosure.

[0013] Figure 6 Describe an exemplary method for RA according to some embodiments of the present disclosure.

[0014] Figure 7 Describe exemplary signal sequences for RA according to some embodiments of the present disclosure.

[0015] Figure 8 Describe exemplary signal sequences for restarting the RA process according to some embodiments of the present disclosure.

[0016] Figure 9 Describe exemplary signal sequences for restarting the RA process according to some embodiments of the present disclosure.

[0017] Figure 10 Describe an exemplary restarted RA process according to some embodiments of the present disclosure.

[0018] Figure 11 Describe an exemplary restarted RA process according to some embodiments of the present disclosure.

[0019] Figure 12 Describe an exemplary restarted RA process according to some embodiments of the present disclosure.

[0020] Figure 13 Describe an exemplary restarted RA process according to some embodiments of the present disclosure.

[0021] Figure 14 Describe an exemplary restarted RA process according to some embodiments of the present disclosure.

[0022] Figure 15 Describe an exemplary method for RA according to some embodiments of the present disclosure.

[0023] Figure 16 Describe an exemplary device according to some embodiments of the present disclosure.

[0024] Figure 17 Describe an exemplary device according to some embodiments of the present disclosure. Detailed Description of the Embodiments

[0025] The detailed description of the drawings is intended as a description of the preferred embodiments of the present invention and is not intended to represent the only form in which the present invention may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be covered by the spirit and scope of the present disclosure.

[0026] Reference will now be made in detail to some embodiments of the present application, examples of which are illustrated in the accompanying drawings. For the sake of facilitating understanding, the embodiments are provided under a specific network architecture and new service scenarios (such as 3GPP 5G, etc.). After consideration, with the development of the network architecture and new service scenarios, all embodiments in the present application are also applicable to similar technical problems, and in addition, the terms cited in the present application may vary, which should not affect the principles of the present application.

[0027] The present disclosure generally relates to the RA process.

[0028] In 5G, in addition to legacy UEs, there may be various other types of UEs, such as RedCap UEs. These RedCap UEs can access the network in a fully backward-compatible manner. Similar to legacy UEs, RedCap UEs can detect legacy synchronization signals and physical broadcast channel (PBCH) blocks (i.e., SSBs) to synchronize to the downlink, RedCap UEs can obtain physical cell identifiers (IDs) and information in the master information block (MIB), etc. Then, RedCap UEs can detect legacy system information block 1 (SIB1) in the initial BWP. Based on the configuration in SIB1, RedCap UEs then detect paging and / or initiate the RA process according to, for example, DL / UL data availability, and complete the initial access process.

[0029] That is, RedCap UEs can occupy the same resources used by legacy UEs for the RA process. Therefore, in some scenarios, for example, when there are a large number of RedCap UEs trying to access the network, the performance of legacy UEs (such as eMBB and URLLC UEs) can degrade during the RA process. For example, there may be a high collision rate for transmitted physical RA channel (PRACH) preambles, which results in delayed access for legacy UEs. As another example, in addition to the UE transmitting a first type of message (hereinafter referred to as Msg1) and receiving a first type of response message (hereinafter referred to as Msg2), the RA process may further include the UE transmitting a second type of message (hereinafter referred to as Msg3) to the BS and the UE receiving a second type of response message (hereinafter referred to as Msg4) from the BS. If the base station (BS, such as a gNB) cannot identify the RedCap UE before Msg3 / Msg4, the scheduling opportunity for Msg3 or Msg4 for transmitting / receiving the RA of legacy UEs will be reduced, which will also result in delayed access for legacy UEs.

[0030] For legacy RA, the initial downlink (DL) BWP and the initial UL BWP are used for message passing.

[0031] Figure 1 Illustrate an exemplary method 100 performed by a UE according to the present disclosure to perform RA.

[0032] AsFigure 1 As shown in Figure 1 , method 100 may at least include: if a second UL BWP (hereinafter referred to as UL BWP2) is not configured or is configured but deactivated, then transmit Msg1 to a base station (BS) in a first UL BWP (hereinafter referred to as UL BWP1), or if UL BWP2 is configured and activated, then the operation 110 of transmitting Msg1 in UL BWP2; and the operation 120 of receiving Msg2 from the BS in a DL BWP, where UL BWP1 is configured in SIB1 and the DL BWP is a legacy BWP for legacy RA.

[0033] In some embodiments, the BS may be referred to as an access point, access terminal, base, base unit, macro cell, Node - B, evolved Node B (eNB), generalized Node B (gNB), home Node - B, relay node, or device, or described using other terms used in the art.

[0034] In some embodiments, UL BWP1 and the DL BWP are the initial BWPs used by a legacy UE for legacy RA.

[0035] In some embodiments, the UE receives Msg2 in the initial DL BWP used by the legacy UE for legacy RA.

[0036] In some embodiments, Msg2 may be a MAC PDU containing one or more MAC sub - PDUs.

[0037] Figure 2 Illustrate an exemplary signal sequence of the RA process according to method 100.

[0038] As Figure 2 As shown in Figure 2 , BS220 may transmit configuration 230 to UE 210. In some embodiments, configuration 230 is included in SIB1. If BS220 does not transmit configuration 230, or UL BWP2 is not configured, then UE 210 may follow legacy RA. Any handover indicators in Msg2 are ignored.

[0039] In some embodiments, configuration 230 configures UL BWP2 and activates or deactivates UL BWP2.

[0040] In some embodiments, configuration 230 may configure other UL BWPs (e.g., UL BWP3) in addition to UL BWP1 and UL BWP2, and activate or deactivate these UL BWPs respectively.

[0041] In some embodiments, UL BWP2 is configured through signaling in SIB1 and activated or deactivated through another signaling in SIB1.

[0042] As Figure 2 shown in, UE 210 further transmits Msg1 240 to BS220 and receives Msg2 250 from BS220.

[0043] In some embodiments, if UL BWP2 is configured but deactivated, then UE 210 may transmit Msg1 240 to BS220 in UL BWP1.

[0044] In some embodiments, if UL BWP2 is configured and activated, then UE 210 may transmit Msg1 240 to BS220 in UL BWP2.

[0045] In some embodiments, Msg2 250 may or may not include a handover indicator for activating or deactivating the configured UL BWP2 and for indicating to the UE to perform a BWP handover.

[0046] In some embodiments, Msg2 250 may include at least one handover indicator in Msg2, and if UL BWP2 is configured by configuration 230, then the handover indicator is used to activate or deactivate UL BWP2.

[0047] In some embodiments, Msg2 250 may include a handover indicator in a MAC sub-PDU and / or may include a handover indicator in a UL grant for scheduling Msg3.

[0048] In some embodiments, when UE 210 receives Msg2, UE 210 may check whether Msg2 includes a handover indicator.

[0049] In some embodiments, if Msg2 250 does not match Msg1, and if UL BWP2 is configured by configuration 230, then UE 210 may check whether there is a handover indicator in the MAC sub-PDU of Msg2 250. In one embodiment, if the handover indicator exists and indicates that the UE performs a BWP handover, then the UE may switch to UL BWP2 to restart the RA process.

[0050] In the present disclosure, Msg2 (e.g., Msg2 250) matching Msg1 (e.g., Msg1 240) means that the received Msg2 contains the preamble ID transmitted in Msg1, and Msg2 not matching Msg1 means that the received Msg2 does not contain the preamble ID transmitted in Msg1.

[0051] In some embodiments, if the UE 210 receives Msg2 250, and Msg2 250 matches Msg1 240, and the UL BWP2 is configured by the configuration 230, then the UE 210 may check whether there is a handover indicator in the UL grant for scheduling Msg3 in Msg2 250.

[0052] In some embodiments, if Msg2 250 contains the corresponding handover indicator, then the UE 210 may determine the UL BWP (UL BWP1 or UL BWP2) for possible subsequent transmissions of the RA message according to the configuration 230 and the corresponding handover indicator.

[0053] In some embodiments, if Msg2 250 does not contain the corresponding handover indicator, the UE 210 continues to use the previously used UL BWP for possible subsequent transmissions.

[0054] If the UL BWP2 is configured by the configuration 230 and deactivated by the handover indicator, then the UE 210 may use the UL BWP1 for subsequent transmissions of the RA message, regardless of whether the configuration 230 activates or deactivates the UL BWP2.

[0055] If the UL BWP2 is configured by the configuration 230 and activated by the handover indicator, then the UE 210 may use the UL BWP2 for subsequent transmissions of the RA message, regardless of whether the configuration 230 activates or deactivates the UL BWP2.

[0056] In some embodiments, at least one UL BWP is configured by the configuration 230, and is activated or deactivated by the configuration 230 and / or the handover indicator; and the UE 210 may use at least one UL BWP to transmit at least one RA message (e.g., Msg1 240).

[0057] Figure 3 Describe the exemplary handover indicator 350 in the MAC sub-PDU in Msg2. Msg2 250 may be a MAC PDU that may contain one or more MAC sub-PDUs, among which there is a MAC sub-PDU that contains the handover indicator 350.

[0058] In some embodiments, in addition to the UL BWP1, the BS 220 also configures a UL BWP, such as the UL BWP2. The handover indicator 350 may be a bit, as shown in Option 1 in Figure 3 In some embodiments, if the handover indicator 350 is "0", it means deactivating the UL BWP2; and if the handover indicator 350 is "1", it means activating the UL BWP2.

[0059] In some embodiments, in addition to UL BWP1, BS220 is further configured with multiple UL BWPs. Accordingly, the handover indicator 350 can be multiple bits. For example, the handover indicator 350 can be two bits, as shown in Option 2 of Figure 3 which means that in addition to UL BWP1, BS220 can be further configured with up to 4 UL BWPs.

[0060] In some embodiments, if UE 210 receives Msg2 250 and Msg2 250 matches Msg1, then UE210 can further transmit Msg3 to BS220 and receive Msg4 from BS220.

[0061] Figure 4 Illustrates an exemplary method 400 performed by UE 210 according to the present disclosure to perform RA, where Msg2 matches Msg1.

[0062] As shown in Figure 4 the method 400 may at least include: an operation 410 of transmitting Msg1 to BS220 in UL BWP1 if UL BWP2 is not configured or is configured but deactivated, or transmitting Msg1 to BS220 in UL BWP2 if UL BWP2 is configured and activated; an operation 420 of receiving Msg2 in the DL BWP from BS220; an operation 430 of transmitting Msg3 to BS220 in UL BWP1 if UL BWP2 is not configured or is configured but deactivated, or transmitting Msg3 to BS220 in UL BWP2 if UL BWP2 is configured and activated; and an operation 440 of receiving Msg4 in the DL BWP from BS220, where UL BWP1 is configured in SIB1.

[0063] In some embodiments, UL BWP1 can be used for all UEs.

[0064] In some embodiments, UL BWP1 and DL BWP are the initial BWPs used by legacy UEs in legacy RA.

[0065] Figure 5 Illustrates an exemplary signal sequence of the RA process according to method 400.

[0066] As shown in Figure 5 BS220 can transmit configuration 230 to UE 210. In some embodiments, configuration 230 is included in SIB1.

[0067] If BS220 does not transmit configuration 230, then UE 210 may follow the legacy RA. Any handover indicator in Msg2 250 is ignored.

[0068] In some embodiments, if UL BWP2 is configured but deactivated, then UE 210 may transmit Msg1 240 to BS220 in UL BWP1.

[0069] In some embodiments, if UL BWP2 is configured and activated, then UE 210 may transmit Msg1 240 to BS220 in UL BWP2.

[0070] In some embodiments, Msg2 250 may not include a handover indicator for activating or deactivating the configured UL BWP2.

[0071] In some embodiments, Msg2 250 may include at least one handover indicator for activating or deactivating UL BWP2 and indicating that the UE performs a BWP handover if UL BWP2 is configured by configuration 230.

[0072] In some embodiments, Msg2 250 may include a handover indicator in a MAC sub-PDU, and / or may include a handover indicator in a certain UL grant.

[0073] In some embodiments, when UE 210 receives Msg2 250, UE 210 may check whether there is a handover indicator included in Msg2 250.

[0074] In some embodiments, if Msg2 250 does not match Msg1, and if UL BWP2 is configured by configuration 230, then UE 210 may check whether there is a handover indicator in the MAC sub-PDU in Msg2 250. In one embodiment, if the handover indicator indicates that the UE performs a BWP handover, then the UE may switch to UL BWP2 to restart the RA process.

[0075] In some embodiments, if UE 210 receives Msg2 250, and Msg2 250 matches Msg1 240, and UL BWP2 is configured by configuration 230, then UE 210 may check whether there is a handover indicator in the UL grant for scheduling Msg3 in Msg2 250. UE 210 ignores any handover indicator contained in any MAC sub-PDU in Msg2 250.

[0076] In some embodiments, if Msg2 250 includes a corresponding handover indicator and UL BWP2 is configured, then UE 210 may determine, according to the corresponding handover indicator, a UL BWP (UL BWP1 or UL BWP2) for possible subsequent transmissions.

[0077] In some embodiments, Msg2 250 does not include a corresponding handover indicator, and UE 210 continues to use the previously used UL BWP (UL BWP1 or UL BWP2) for possible subsequent transmissions.

[0078] According to Figure 4 the method 400 shown in Figure 5 and the signal sequence of RA shown in

[0079] since Msg 2 250 matches Msg1 240, UE 210 may further transmit Msg3 to BS2 220 and receive Msg4 from BS2 220. If the UL grant for scheduling Msg3 in Msg2 250 contains a handover indicator, then the UE may check whether the handover indicator activates or deactivates UL BWP2.

[0080] If UL BWP2 is deactivated by the handover indicator, then UE 210 transmits Msg3 in UL BWP1.

[0080] If UL BWP2 is activated by the handover indicator, then UE 210 may switch to UL BWP2 and transmit Msg3 in UL BWP2.

[0081] If the UL grant for scheduling Msg3 in Msg2 250 does not contain any handover indicator, then the UE may transmit Msg3 in the same UL BWP in which it transmits Msg1 240.

[0082] The UL BWP for transmitting Msg3 may be the same as or different from the UL BWP for transmitting Msg1 240.

[0083] For example, since UL BWP2 is configured but deactivated, Msg1 240 is transmitted in UL BWP1. If the handover indicator in Msg2 250 activates UL BWP2, then Msg3 is transmitted in UL BWP2.

[0084] For example, since UL BWP2 is configured and activated, Msg1 240 is transmitted in UL BWP2. If the handover indicator in Msg2 250 deactivates UL BWP2, then Msg3 is transmitted in UL BWP1.

[0085] For example, since UL BWP2 is configured and activated, Msg1 240 is transmitted in UL BWP2. If Msg2 250 does not contain a handover indicator, the UE continues to use UL BWP2 for transmitting Msg3.

[0086] For example, since UL BWP2 is configured and deactivated, Msg1 240 is transmitted in UL BWP1. If Msg2 250 does not contain a handover indicator, the UE continues to use UL BWP1 for transmitting Msg3.

[0087] For legacy RAs, legacy UEs use the initial DL BWP for receiving messages (e.g., Msg2 and / or Msg4).

[0088] In the present disclosure, the BS configures DL BWP1 in SIB1, which can be used for all UEs including legacy UEs and RedCap UEs. DL BWP1 is the initial DL BWP used in legacy RAs.

[0089] The BS may further configure DL BWP2 and activate or deactivate DL BWP2 in SIB1. If DL BWP2 is configured and activated in Msg2, the UE may receive Msg2 and / or Msg4 in DL BWP2.

[0090] Figure 6 Describe an exemplary method 600 performed by a UE according to the present disclosure to perform RA, where Msg2 matches Msg1.

[0091] As Figure 6 shown, method 600 may at least include: an operation 610 of transmitting Msg1 to the BS in UL BWP1 if UL BWP2 is not configured or is configured but deactivated, or transmitting Msg1 to the BS in UL BWP2 if UL BWP2 is configured and activated; and an operation 620 of receiving Msg2 in DL BWP1 if DL BWP2 is not configured or is configured but deactivated, or receiving Msg2 in DL BWP2 if DL BWP2 is configured and activated.

[0092] If Msg2 matches Msg1, method 600 may further include: operation 630 of transmitting Msg3 to the BS in UL BWP1 if UL BWP2 is not configured or is configured but deactivated, or transmitting Msg3 to the BS in UL BWP2 if UL BWP2 is configured and activated; and operation 640 of receiving Msg4 in DL BWP1 if DL BWP2 is not configured or is configured but deactivated, or receiving Msg4 in DL BWP2 if DL BWP2 is configured and activated, wherein UL BWP1 and DL BWP1 are configured in SIB1.

[0093] In some embodiments, UL BWP1 and DL BWP1 are the initial BWPs of the legacy RA and can be used for all legacy UEs.

[0094] Figure 7 Illustrate an exemplary signal sequence of the RA process according to method 600.

[0095] As Figure 7 shown, the BS 720 may transmit a configuration 730 to the UE 710. In some embodiments, the configuration 730 is included in SIB1.

[0096] If the BS 720 does not transmit the configuration 730, then the UE 710 may follow the legacy RA. Any handover indicator in Msg2 750 is ignored.

[0097] If the configuration 730 does not configure UL BWP2, then the UE 710 may transmit Msg1 740 and / or Msg3 in a legacy manner.

[0098] The configuration 730 does not configure DL BWP2, and the UE 710 may receive Msg2 and / or Msg4 in a legacy manner.

[0099] In some embodiments, the configuration 730 configures at least one of UL BWP2 and DL BWP2.

[0100] In some embodiments, DL BWP2 is configured. The handover indicator in Msg2 indicates a BWP handover to DL BWP2. The UE may receive Msg2 and / or Msg4 in DL BWP2.

[0101] In some embodiments, DL BWP2 is configured and associated with a UL BWP (e.g., UL BWP2). The handover indicator in Msg2 indicates a BWP handover for both UL and DL.

[0102] In some embodiments, multiple DL BWPs are configured. The handover indicator in Msg2 indicates a handover to one of the DL BWPs. The UE may receive Msg2 and / or Msg4 in the DL BWP.

[0103] In some embodiments, multiple DL BWPs are configured, and each DL BWP is associated with a configured UL BWP. The handover indicator in Msg2 indicates a handover of both UL and DL BWPs.

[0104] For the configuration and use of UL BWP2, please refer to the various embodiments and examples above.

[0105] The configuration and use of DL BWP2 are similar to those of UL BWP2.

[0106] In some embodiments, if DL BWP2 is configured but deactivated, then the UE 710 may receive Msg2 750 from the BS 720 in DL BWP1.

[0107] In some embodiments, if DL BWP2 is configured and activated, then the UE 710 may receive Msg2 750 from the BS720 in DL BWP2.

[0108] In some embodiments, Msg2 750 does not contain a handover indicator.

[0109] In some embodiments, Msg2 750 contains a handover indicator for activating or deactivating UL BWP2 and / or DL BWP2.

[0110] In some embodiments, Msg2 750 may contain at least one handover indicator.

[0111] In some embodiments, Msg2 750 may contain a handover indicator in a MAC sub-PDU, and / or may contain a handover indicator in a UL grant for scheduling Msg3.

[0112] In some embodiments, when the UE 710 receives Msg2 750, the UE 710 may check whether there is a handover indicator contained in Msg2 750.

[0113] In some embodiments, if Msg2 750 does not match Msg1 740, and if at least one of UL BWP2 and DL BWP2 is configured by configuration 730, then the UE 710 may check whether there is a handover indicator in the MAC sub-PDU of Msg2 750.

[0114] In some embodiments, if the UE 710 receives Msg2 750 and Msg2 750 matches Msg1 740, and at least one of UL BWP2 and DL BWP2 is configured by configuration 730, then the UE 710 may check whether there is a handover indicator in the UL grant for scheduling Msg3 in Msg2 750. The UE ignores any handover indicator contained in any MAC sub-PDU in Msg2 750.

[0115] In some embodiments, if Msg2 750 contains a corresponding handover indicator and at least one of DL BWP2 and UL BWP2 is configured, then the UE 710 may determine at least one of DL BWP and UL BWP for possible subsequent transmissions according to the corresponding handover indicator.

[0116] In some embodiments, if Msg2 750 does not contain a corresponding handover indicator, the UE 710 continues to use the previously used BWP for possible subsequent transmissions.

[0117] According to Figure 6 the method 600 shown in Figure 7 and the signal sequence of RA shown in

[0118] if Msg2 750 matches Msg1 740, the UE 710 may further transmit Msg3 to the BS 720 and receive Msg4 from the BS 720. If the UL grant for scheduling Msg3 in Msg2 750 contains a handover indicator, then the UE 710 may check whether the handover indicator activates or deactivates UL BWP2 and / or DL BWP2.

[0119] If the configured DL BWP2 is deactivated by the handover indicator, then the UE 710 may receive Msg4 in DL BWP1.

[0120] If the configured DL BWP2 is activated by the handover indicator, then the UE 710 may switch to DL BWP2 and receive Msg4 in DL BWP2.

[0121] The DL BWP for receiving Msg4 may be the same as or different from the DL BWP for receiving Msg2 750.

[0122] For example, since DL BWP2 is configured but deactivated, Msg2 750 is received in DL BWP1. If the handover indicator in Msg2 750 activates DL BWP2, then Msg4 is received in DL BWP2.

[0123] For example, since DL BWP2 is configured and activated, Msg2 750 is received in DL BWP2. If the handover indicator in Msg2 750 deactivates DL BWP2, then Msg4 is received in DL BWP1.

[0124] For example, since DL BWP2 is configured and activated, Msg2 750 is received in DL BWP2. If Msg2 750 does not contain a handover indicator, then the UE continues to use DL BWP2 for receiving Msg4.

[0125] For example, since UL BWP2 is configured but deactivated, Msg2 750 is received in UL BWP1. If Msg2 750 does not contain a handover indicator, then the UE continues to use DL BWP1 for receiving Msg4.

[0126] In some embodiments, if Msg2 750 does not match Msg1 740, then the RA fails.

[0127] In some embodiments, if Msg4 does not match Msg3, then the RA fails. For example, if the contention resolution ID in Msg4 is not the contention resolution ID sent by the UE (e.g., UE 210, UE 710) in Msg3, then it means that Msg4 does not match Msg3.

[0128] In some embodiments, if the RA process fails, then the UE may restart the RA process, i.e., the UE may retransmit Msg1 and receive Msg2 again. In some embodiments, if the re - received Msg2 matches the re - transmitted Msg1, then the UE may further retransmit Msg3 and receive Msg4 again. In some embodiments, if the re - received Msg2 does not match the re - transmitted Msg1, or if the re - received Msg4 does not match the re - transmitted Msg3, then the UE may continue to restart the RA process again.

[0129] In some embodiments, UL BWP2 can be configured through the configuration in SIB1. When the UE restarts the RA process, the UE can check whether UL BWP2 is activated or deactivated. If UL BWP2 is deactivated, then the UE transmits messages (e.g., Msg1, Msg2) in UL BWP1. If UL BWP2 is activated, then the UE switches to UL BWP2 and transmits messages in UL BWP2.

[0130] In some embodiments, DL BWP2 can be configured through the configuration in SIB1. When the UE restarts the RA process, the UE can check whether DL BWP2 is activated or deactivated. If DL BWP2 is activated, then the UE receives messages (e.g., Msg2, Msg4) in DL BWP1. If DL BWP2 is activated, then the UE switches to DL BWP2 and receives messages in DL BWP2.

[0131] In some embodiments, the UE can record the consecutive failure times of the RA process.

[0132] In some embodiments, the UE records the consecutive failure times of the RA process. When the UE restarts the RA process, even if DL BWP2 or UL BWP2 is configured and activated, if the consecutive failure times of the RA process do not exceed a certain number, the UE can still use the old BWP.

[0133] During the restarted RA process, if at least one of DL BWP2 and UL BWP2 is configured, then the UE can check whether the re - received Msg2 contains the corresponding handover indicator in the UL grant for scheduling Msg3 or in the MAC sub - PDU.

[0134] In some embodiments, the re - transmission of Msg1 includes: if UL BWP2 is not configured, or is configured but deactivated, then re - transmit Msg1 in UL BWP1; or, if UL BWP2 is configured and activated, but the consecutive RA failure times are less than or equal to the first value, then re - transmit Msg1 in UL BWP1; or, if UL BWP2 is configured and activated, and the consecutive RA failure times exceed the first value, then re - transmit Msg1 in UL BWP2. If the consecutive RA failure times are less than or equal to the first value, then even if UL BWP2 is activated and configured, the UE may not use UL BWP2.

[0135] In some embodiments, retransmitting Msg3 includes: if UL BWP2 is not configured, or is configured but deactivated, then retransmitting Msg3 in UL BWP1; or, if UL BWP2 is configured and activated, but the number of consecutive RA failures is less than or equal to a first value, then retransmitting Msg3 in UL BWP1; or, if UL BWP2 is configured and activated, and the number of consecutive RA failures of Msg1 exceeds the first value, then retransmitting Msg3 in UL BWP2. If the number of consecutive RA failures is less than or equal to the first value, then even if UL BWP2 is activated and configured, the UE may still not use UL BWP2.

[0136] In some embodiments, the first value is an integer greater than or equal to zero, and is set by the UE or the BS or pre-configured.

[0137] In some embodiments, re-receiving Msg2 includes: if DL BWP2 is not configured, or is configured but deactivated, then re-receiving Msg2 in DL BWP1; or, if DL BWP2 is configured and activated, but the number of consecutive RA failures is less than or equal to a second value, then re-receiving Msg2 in DL BWP1; or, if DL BWP2 is configured and activated, and the number of consecutive RA failures exceeds the second value, then re-receiving Msg2 in DL BWP2. If the number of consecutive RA failures is less than or equal to the second value, then even if DL BWP2 is activated and configured, the UE may still not use DL BWP2.

[0138] In some embodiments, re-receiving Msg4 includes: if DL BWP2 is not configured, or is configured but deactivated, then re-receiving Msg4 in DL BWP1; or, if DL BWP2 is configured and activated, but the number of consecutive RA failures is less than or equal to a second value, then re-receiving Msg4 in DL BWP1; or, if DL BWP2 is configured and activated, and the number of consecutive RA failures exceeds the second value, then re-receiving Msg4 in DL BWP2. If the number of consecutive RA failures is less than or equal to the second value, then even if DL BWP2 is activated and configured, the UE may still not use DL BWP2.

[0139] In some embodiments, the second value is an integer greater than or equal to zero, and is set by the UE or the BS or pre-configured.

[0140] By using configurations (e.g., configuration 230, configuration 730) and / or switching indicators, the BS can flexibly switch the UE to perform RA in a BWP other than the legacy BWP used by the legacy UE. For example, the BS can switch the UL of the UE from UL BWP1 to UL BWP2 and / or switch the DL of the UE from DL BWP1 to DL BWP2. The UE can be a RedCap UE or belong to a specific type of RedCap UE.

[0141] The advantage is to reduce the frequency conflict between the legacy UE and the RedCap UE or between the legacy UE and a specific type of RedCap UE during the RA process, so as to reduce the performance degradation of the legacy UE during the RA process. For the case where there are a large number of RedCap UEs in the network, the said advantage is more prominent.

[0142] In some embodiments, Msg2 may contain a sleep indicator in the MAC sub-PDU, and the sleep indicator indicates that if the number of consecutive failures of RA exceeds a third value, the UE can sleep for a sleep duration before restarting the next RA process.

[0143] In some embodiments, the third value is an integer greater than or equal to zero, and is set by the UE or the BS or pre-configured.

[0144] In some embodiments, the sleep duration is configured in SIB1 or Msg2.

[0145] In some embodiments, the BS pre-defines a table containing a set of candidate time periods. The BS can select at least one candidate from the table as the sleep duration and configure the UE accordingly.

[0146] In some embodiments, the UE can randomly select a candidate from at least one candidate configured by the BS.

[0147] In addition, in some embodiments, the UE can further select a random backoff duration according to a uniform distribution between 0 and PREAMBLE_BACKOFF. If the number of consecutive failures of RA exceeds a second quantity, the UE can restart the next RA process after the sleep duration and the backoff duration.

[0148] Figure 8 Illustrate an exemplary signal sequence for restarting the RA process, where the third value is set or pre-configured to 0.

[0149] In this example, the UE performs RA but fails because Msg2 does not contain the preamble transmitted in Msg1. Since the second value is 0, the UE can sleep for a sleep duration and back off for a backoff duration (860) before restarting the RA process.

[0150] Figure 9 Illustrate an exemplary signaling sequence for restarting the RA process, where the second value is set or pre-configured to 0.

[0151] In this example, the UE performs RA but fails because Msg4 does not contain the contention resolution ID transmitted in Msg3. Since the second value is 0, the UE can sleep for a sleep duration and back off for a backoff duration (960) before restarting the RA process.

[0152] In some embodiments, Msg2 contains the parameter BACKOFF_start, where BACKOFF_start is greater than the BACKOFF_start of the backoff time of legacy UEs. If the number of consecutive failure times of the RA process exceeds a third quantity, the UE can randomly select a backoff duration according to a uniform distribution between BACKOFF_start and PREAMBLE_BACKOFF and restart the next RA process after the backoff duration.

[0153] By using the sleep duration and / or the backoff duration, the BS can flexibly disperse the restart time of the UE RA process over a wider duration or different durations. The UE can be a RedCap UE or belong to a specific type of RedCap UE.

[0154] The advantage is to reduce the time conflict between legacy UEs and RedCap UEs during the RA process to reduce the performance degradation of legacy UEs during the RA process. For the case where there are a large number of RedCap UEs in the network, the advantage is more prominent.

[0155] Figures 10 to 14 Illustrate several instances of restarting RA due to RA failure. However, the present disclosure is not limited to these instances.

[0156] In Figure 10 In the example shown, UL BWP1 and DL BWP1 can be used for all UEs, UL BWP2 is configured by SIB1 but deactivated, and DL BWP2 is not configured. The BS does not configure the first value, or the first value is set to 0. In addition, the BS does not configure the sleep duration, and the backoff duration is 0.

[0157] The UE performs RA. It transmits Msg1 in UL BWP1 and receives Msg2 in DL BWP1. Since Msg2 does not match Msg1, the UE restarts RA. In this example, the MAC sub-PDU of Msg2 contains a handover indicator for activating UL BWP2. When the UE restarts RA, it re-transmits Msg1 in UL BWP2 and receives Msg2 in DL BWP1.

[0158] In Figure 11 the example shown in Figure 11 , UL BWP1 and DL BWP1 can be used for all UEs, UL BWP2 is configured and activated by SIB1, and DL BWP2 is not configured. The BS configures the first value to 1. In addition, the BS does not configure the sleep duration, and the backoff duration is 0.

[0159] The UE performs RA. It transmits Msg1 in UL BWP2 and receives Msg2 in DL BWP1. Msg2 matches Msg1, and the UL grant specific to scheduling Msg3 does not contain any handover indicators. Then, the UE continues to transmit Msg3 in UL BWP2 and receives Msg4 in DL BWP1. Msg4 does not match Msg3, which means the RA fails. The UE restarts RA. The number of consecutive RA failures is 1, and the first value is 1. The UE re-transmits Msg1 and Msg3 in UL BWP1 and re-receives Msg2 and Msg4 in DL BWP1.

[0160] In Figure 12 the example shown in Figure 12 , UL BWP1 and DL BWP1 can be used for all UEs, UL BWP2 is configured and activated by SIB1, and DL BWP2 is configured but deactivated by SIB1. The BS configures both the first value and the second value to 2. In addition, the BS does not configure the sleep duration and the backoff duration is 0.

[0161] The UE performs RA. It transmits Msg1 in UL BWP2 and receives Msg2 in DL BWP1. Msg2 matches Msg1, and the UL grant specific to scheduling Msg3 contains a handover indicator for activating UL BWP2 and DL BWP2. Then, the UE continues to transmit Msg3 in UL BWP2 and receives Msg4 in DL BWP2. Since Msg4 does not match Msg3, the RA fails. The UE restarts RA. The number of consecutive RA failures is 1. The UE re-transmits Msg1 and Msg3 in UL BWP1 and re-receives Msg2 and Msg4 in DL BWP1.

[0162] In Figure 13 the example shown in Figure 13 , UL BWP1 and DL BWP1 can be used for all UEs, UL BWP2 and DL BWP2 are configured and activated by SIB1. The BS configures all the first value, the second value, and the third value to 0. In addition, the BS configures a non-zero sleep duration and a non-zero backoff duration.

[0163] The UE performs a RA process. It transmits Msg1 in UL BWP2 and receives Msg2 in DL BWP2. Since Msg2 does not match Msg1, the RA fails. In addition, the MAC sub-PDU in Msg2 contains a handover indicator for deactivating DL BWP2 and a sleep indicator for indicating that the UE sleeps for a sleep duration, where the sleep duration is configured in the MAC sub-PDU. After the sleep duration and the backoff duration, the UE restarts the RA process. The UE re-transmits Msg1 in UL BWP2 and re-receives Msg2 in DL BWP1.

[0164] In Figure 14 the example shown, UL BWP1 and DL BWP1 can be used for all UEs, UL BWP2 and DL BWP2 are configured and activated by SIB1, and UL BWP3 is configured by SIB1 but deactivated. The BS configures all the first value, the second value, and the third value to 0.

[0165] The UE performs a RA process. It transmits Msg1 in UL BWP2 and receives Msg2 in DL BWP2. Since Msg2 does not match Msg1, the RA fails. In addition, the MAC sub-PDU in Msg2 contains a handover indicator for deactivating UL BWP2 and activating UL BWP3, and a sleep indicator for indicating that the UE sleeps for a sleep duration, where the sleep duration is configured in the MAC sub-PDU. After the sleep duration and the backoff duration, the UE restarts RA. The UE re-transmits Msg1 in UL BWP3 and re-receives Msg2 in DL BWP2. The re-received Msg2 matches the re-transmitted Msg1 and does not contain any handover indicator. In this example, the UE continues to transmit Msg3 in UL BWP3 and receive Msg4 in DL BWP2. In this example, Msg3 matches Msg4. The restarted RA is successful.

[0166] Figure 15 Illustrate an exemplary method 1500 performed by a BS (e.g., BS220) according to the present disclosure to perform RA.

[0167] As Figure 15 shown, method 1500 may at least include: an operation 1510 of receiving Msg1 in UL BWP1 if UL BWP2 is not configured or is configured but deactivated, or receiving Msg1 in UL BWP2 if UL BWP2 is configured and activated; and an operation 1520 of transmitting Msg2 in DL BWP, where UL BWP1 is an old UL BWP configured by the BS in SIB1 and available for all UEs.

[0168] In some embodiments, the BS may further include: operation 1530 of receiving Msg3 in UL BWP1 if UL BWP2 is not configured or is configured but deactivated, or receiving Msg3 in UL BWP2 if UL BWP2 is configured and activated; and operation 1540 of transmitting Msg4 in DL BWP.

[0169] In some embodiments, operation 1520 of transmitting Msg2 further includes transmitting Msg2 in DL BWP1 if DL BWP2 is not configured or is configured but deactivated, or transmitting Msg2 in DL BWP2 if DL BWP2 is configured and activated, where DL BWP1 is an existing DL BWP configured by the BS in SIB1 and available for all UEs.

[0170] In some embodiments, operation 1540 of transmitting Msg4 further includes transmitting Msg2 in DL BWP1 if DL BWP2 is not configured or is configured but deactivated, or transmitting Msg4 in DL BWP2 if DL BWP2 is configured and activated.

[0171] In some embodiments, the BS may or may not transmit a configuration (e.g., configuration 230, configuration 730) to the UE. If the BS does not transmit the configuration, the UE may perform legacy RA by using UL BWP1 and DL BWP1.

[0172] In some embodiments, the configuration may be included in SIB1.

[0173] In some embodiments, the configuration configures and activates or deactivates at least one of UL BWP2 and DL BWP2.

[0174] In some embodiments, the configuration configures at least DL BWP2 and activates or deactivates UL BWP2.

[0175] In some embodiments, UL BWP2 is configured by signaling in SIB1 and activated or deactivated by another signaling in SIB1.

[0176] In some embodiments, DL BWP2 is configured by signaling in SIB1 and activated or deactivated by another signaling in SIB1.

[0177] In some embodiments, the configuration may include a sleep duration.

[0178] In some embodiments, Msg2 may not include a handover indicator.

[0179] In some embodiments, Msg2 may include at least one handover indicator in the MAC sub-PDU or the UL grant for scheduling Msg3, where the handover indicator may activate or deactivate at least one of DL BWP2 and UL BWP2.

[0180] In some embodiments, Msg2 may include at least one handover indicator in the MAC sub-PDU and at least one handover indicator in the UL grant for scheduling Msg3.

[0181] In some embodiments, Msg2 may include a sleep duration.

[0182] In some embodiments, Msg2 may include a sleep indicator in the MAC sub-PUD.

[0183] According to the various embodiments and examples mentioned above, the present disclosure may provide additional UL BWP2 and DL BWP2 for RA. By using configurations (e.g., configuration 230, configuration 730) and / or handover indicators, and / or sleep duration and sleep indicator, the BS can flexibly configure the RA frequency and RA time. Therefore, the BS can separate the RA from the legacy RA according to frequency and / or time resources.

[0184] In some scenarios, for example, when there are a large number of RedCap UEs attempting to access the network, the RA environment of legacy UEs (e.g., eMBB and URLLC UEs) may degrade. To avoid this problem, the BS can flexibly switch RedCap UEs or a specific type of RedCap UEs to other BWPs, and if their RA process fails, then restart the RA process of these UEs over a wider range. That is, the present disclosure can flexibly separate RedCap UEs or a specific type of RedCap UEs from legacy UEs according to frequency and time resources to reduce the RA resource conflict rate between RedCap UEs (or a specific type of RedCap UEs) and legacy UEs. The impact of RedCap UEs on the RA of legacy UEs is reduced.

[0185] The various methods, embodiments, and examples described above can be reasonably modified and extended, and can be reasonably combined without contradiction as long as they do not violate the spirit or principle of the present invention.

[0186] For example, in accordance with the spirit of the present application, in addition to the legacy BWPs (e.g., DL BWP1 and UL BWP1), the BS may also support at least one UL BWP and at least one DL BWP.

[0187] The configuration in SIB1 can configure and activate or deactivate at least one of at least one UL BWP and at least one DL BWP. The switching indicator can activate or deactivate at least one UL BWP and at least one DL BWP. Refer to Figure 14 In the example shown in, in addition to the legacy BWPs (UL BWP1 and DL BWP1), the BS also supports DL BWP2, UL BWP2, and UL BWP3.

[0188] In some embodiments, in addition to UL BWP1, the BS can also monitor all configured and activated UL BWPs for receiving messages.

[0189] In some embodiments, in addition to DL BWP1, the BS can also monitor all configured and activated DL BWPs for transmitting messages.

[0190] Figure 16 Illustrate an exemplary device 1600 for performing RA in an embodiment, which can be, for example, at least a part of a UE (e.g., UE 210 or UE 710).

[0191] As Figure 16 shown in, device 1600 can include: at least one receiving circuit system 1610; at least one processor 1620; at least one non-transitory computer-readable medium 1630, on which computer-executable items 1640 are stored; and at least one transmitting circuit system 1650. At least one medium 1630 and computer program code 1640 can be configured to cause device 1600 to perform at least exemplary methods (e.g., method 100, 400, 600) and the above embodiments with at least one processor 1620, where, for example, device 1600 can be the UE in exemplary method 600.

[0192] Figure 17 Illustrate an exemplary device 1700 for performing RA in an embodiment, which can be, for example, at least a part of a BS (e.g., BS 220 or BS 720).

[0193] As Figure 17 shown in, device 1700 can include: at least one receiving circuit system 1710; at least one processor 1720; at least one non-transitory computer-readable medium 1730, on which computer-executable items 1740 are stored; and at least one transmitting circuit system 1750. At least one medium 1730 and computer program code 1740 can be configured to cause device 1700 to perform at least exemplary method 1500, and the above embodiments.

[0194] In various example embodiments, at least one of processors 1620 or 1720 may include, but is not limited to, at least one hardware processor, including at least one microprocessor (e.g., CPU), a portion of at least one hardware processor, and any other suitable dedicated processor, such as a processor developed based on, for example, a field programmable gate array (FPGA) and an application specific integrated circuit (ASIC). Additionally, at least one of processors 1620 or 1720 may still include Figure 16 at least one other circuitry or element not shown in 17.

[0195] In various example embodiments, at least one of media 1630 or 1730 may include at least one storage medium in various forms, such as volatile memory and / or non-volatile memory. Volatile memory may include, but is not limited to, for example, RAM, cache, etc. Non-volatile memory may include, but is not limited to, for example, ROM, hard disk, flash memory, etc. Additionally, at least one of media 1630 or 1730 may include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or apparatuses, or any combination of the foregoing.

[0196] Additionally, in various example embodiments, exemplary device 1600 or 1700 may still include at least one other circuitry, element, and interface, such as antenna elements and the like.

[0197] In various example embodiments, the circuitry, portions, elements, and interfaces in exemplary device 1600 or 1700 (including at least one of processors 1620 or 1720 and at least one of media 1630 or 1730) may be coupled together in any suitable manner (such as electrical, magnetic, optical, electromagnetic, and the like) via any suitable connection, including but not limited to buses, cross switches, wirings, and / or wireless lines.

[0198] The methods of the present disclosure may be implemented on a programmed processor. However, the controllers, flowcharts, and modules may still be implemented on a general or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit (such as a discrete element circuit), a programmable logic device, or the like. Generally, any device having a finite state machine capable of implementing the flowcharts shown in the figures may be used to implement the processing functions of the present disclosure.

[0199] Although the present disclosure has been described with reference to specific embodiments thereof, it will be apparent to those skilled in the art that many alternatives, modifications, and variations are possible. For example, the various components of the embodiments may be interchanged, added, or substituted in other embodiments. Moreover, all of the elements shown in each figure are not necessary for the operation of the disclosed embodiments. For example, those skilled in the art of the disclosed embodiments will be able to make and use the teachings of the present invention by simply employing the elements of the independent claims. Accordingly, the embodiments of the present disclosure set forth herein are intended to be illustrative and not limiting. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0200] In the present disclosure, relative terms such as "first", "second", and the like may be used solely to distinguish one entity or action from another entity or action, and do not necessarily require or imply any actual such relationship or order between such entities or actions. The term "comprise / comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element that starts with "a", "an", or the like (without further limitation) does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element. Moreover, the term "another" is defined as at least a second or more. As used herein, the terms "include", "have", and the like are defined as "comprise".

Claims

1. A method for a user equipment (UE) for wireless communication, comprising: Transmitting a first message type in at least one of: A first uplink bandwidth part (BWP), if at least a second uplink BWP is not configured; The first uplink BWP, if the at least second uplink BWP is configured but deactivated, wherein the first uplink BWP is configured in a system information block (SIB1); Or The at least second uplink BWP, if the at least second uplink BWP is configured and activated, wherein at least one of configuring and activating or deactivating the at least second uplink BWP is based at least in part on the SIB1; Second uplink BWP; And Receiving a first response message type.

2. The method according to claim 1, wherein if the first message type matches the first response message type, then the method further comprises: If the at least second uplink BWP is not configured or is configured but deactivated, then transmitting a second message type in the first uplink BWP, or if the at least second uplink BWP is configured and activated, then transmitting the second message type in the at least second uplink BWP; And Receiving a second response message type.

3. The method according to claim 1, wherein the at least second uplink BWP is configured by a first signaling in the SIB1, and the at least second uplink BWP is activated or deactivated by a second signaling in the SIB1.

4. The method according to claim 1, wherein the at least second uplink BWP is activated or deactivated by a handover indicator included in the first response message type.

5. The method according to claim 1, wherein receiving the first response message type comprises receiving the first response message type in at least one of: A first downlink BWP, if at least a second downlink BWP is not configured; The first downlink BWP, if the at least second downlink BWP is configured but deactivated; or The at least second downlink BWP, if the at least second downlink BWP is configured and activated.

6. The method according to claim 5, wherein the at least second downlink BWP is configured and one of activated or deactivated by a configuration included in the SIB1.

7. The method according to claim 6, wherein the at least second downlink BWP is activated or deactivated by a handover indicator included in the first response message type.

8. A user equipment (UE) for wireless communication, comprising: Receiving circuitry; Transmitting circuitry; And A processor coupled to the receiving circuitry and the transmitting circuitry, configured to cause the UE to: Receive a first message type in at least one of: A first uplink bandwidth part (BWP), if at least a second uplink BWP is not configured; The first uplink BWP, if the at least second uplink BWP is configured but deactivated, where the first uplink BWP is configured in system information block SIB1; Or The at least second uplink BWP, if the at least second uplink BWP is configured and activated, where at least one of the configuration and activation or deactivation of the at least second uplink BWP is based at least in part on the SIB1; And Transmit a first response message type.

9. The UE according to claim 8, wherein the processor coupled to the receiving circuitry and the transmitting circuitry is configured to cause the UE to: Receive a second message type in the first uplink BWP if the at least second uplink BWP is not configured or is configured but deactivated, or receive the second message type in the at least second uplink BWP if the at least second uplink BWP is configured and activated; and Transmit a second response message type.

10. The UE according to claim 8, wherein the at least second uplink BWP is activated or deactivated by a handover indicator included in the first response message type.

11. A base station for wireless communication, comprising: Receiving circuitry; Transmitting circuitry; And A processor coupled to the receiving circuitry and the transmitting circuitry, configured to cause the base station to: Transmit a first message type in at least one of: A first uplink bandwidth part BWP if the at least second uplink BWP is not configured; The first uplink BWP if the at least second uplink BWP is configured but deactivated, where the first uplink BWP is configured in system information block SIB1; Or The at least second uplink BWP if the at least second uplink BWP is configured and activated, where the at least second uplink BWP is configured to be one of activation or deactivation at least in part based on the SIB1; And Receive a first response message type.

12. The base station according to claim 11, wherein if the first message type matches the first response message type, the processor coupled to the receiving circuitry and the transmitting circuitry is configured to cause the base station to: Transmit a second message type in the first uplink BWP if the at least second uplink BWP is not configured or is configured but deactivated, or transmit a second type of message in the at least second uplink BWP if the at least second uplink BWP is configured and activated; and Receive a second response message type.

13. The base station according to claim 11, wherein the at least second uplink BWP is configured by a first signaling in the SIB1, and the at least second uplink BWP is activated or deactivated by a second signaling in the SIB1.

14. The base station according to claim 11, wherein the at least second uplink BWP is activated or deactivated by a handover indicator included in the first response message type.

15. The base station according to claim 11, wherein the first response message type is received in at least one of the following: The first downlink BWP, if the at least second downlink BWP is not configured; The first downlink BWP, if the at least second downlink BWP is configured but deactivated; or The at least second downlink BWP, if the at least second downlink BWP is configured and activated.

16. The base station according to claim 15, wherein the at least second downlink BWP is configured and activated or deactivated by one of the configurations included in the SIB1.

17. The base station according to claim 16, wherein the at least second downlink BWP is activated or deactivated by a handover indicator included in the first response message type.

18. A method for a base station for wireless communication, comprising: Transmitting a first message type in at least one of the following: The first uplink bandwidth part BWP, if the at least second uplink BWP is not configured; The first uplink BWP, if the at least second uplink BWP is configured but deactivated, wherein the first uplink BWP is configured in the system information block SIB1; Or The at least second uplink BWP, if the at least second uplink BWP is configured and activated, wherein the at least second uplink BWP is configured to be activated or deactivated at least in part based on the SIB1; And Receiving a first response message type.

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