Method and device for switching between base stations based on user equipment capabilities

Abstract

In summary, various aspects of the present disclosure relate to wireless communications. In some aspects, a user equipment (UE) may provide information identifying a set of transition capabilities of the UE to a source base station (BS) before the UE switches from the BS to a target BS and to the source BS. The UE may receive a handover command or a reconfiguration message from the source BS after providing the information to the source BS. The UE may communicate with the target BS using a subset of the transition capabilities before release. Several other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 830,954, filed on April 8, 2019, and entitled “USER EQUIPMENT CAPABILITY-BASED TRANSITION,” and U.S. Non-Provisional Patent Application No. 16 / 841,480, filed on April 6, 2020, and entitled “USER EQUIPMENT CAPABILITY-BASED TRANSITION,” both of which are expressly incorporated herein by reference. Technical Field

[0003]

[0004] Aspects of the present disclosure generally relate to wireless communications, and more particularly, to techniques and apparatus for switching based on user equipment (UE) capabilities. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard released by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include multiple base stations (BSs) that can support communications for multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to a communication link from a BS to a UE, while an uplink (or reverse link) refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at the city, country, region, and even global level. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), so as to better support mobile broadband Internet access, as well as support beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) may include: before the UE switches from a source base station (BS) to a target BS, providing information identifying a set of transition capabilities of the UE to the source BS, wherein the set of transition capabilities is about facilitating communication between the UE and the target BS before releasing the source BS during the switch; after providing the information to the source BS, receiving a switching command or reconfiguration message from the source BS, wherein the switching command or reconfiguration message causes the UE to use a subset of the set of transition capabilities to facilitate communication with the target BS before releasing during the switch; and using the subset of the transition capabilities to communicate with the target BS before the release.

[0008] In some aspects, a method of wireless communication performed by a UE may include: before adding a target BS as a secondary node (SN) and providing information identifying a transition capability set of the UE to a source BS operating as a master node (MN), wherein the transition capability set is about facilitating communication within a frequency between the UE after the addition and before a role switch between the target BS and the source BS or a release of the source BS; after providing the information to the source BS, receiving a radio resource control (RRC) reconfiguration message from the source BS, wherein the RRC reconfiguration message causes the UE to use a subset of the transition capability set to facilitate communication within the frequency after the addition and before the role switch or the release; and before the role switch or the release, using the subset of the transition capability set to communicate with the target BS.

[0009] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: provide information identifying a transition capability set of the UE to the source BS before a handover of the UE from a source BS to a target BS, wherein the transition capability set is about facilitating communication between the UE and the target BS before a release of the source BS during the handover; after providing the information to the source BS, receive a handover command or a reconfiguration message from the source BS, wherein the handover command or the reconfiguration message causes the UE to use a subset of the transition capability set during the handover to facilitate the communication with the target BS before the release; and before the release, use the subset of the transition capability to communicate with the target BS.

[0010] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: provide information identifying a transition capability set of the UE to a source BS operating as an MN before adding a target BS as an SN, wherein the transition capability set is about facilitating intra-frequency communication between the UE after adding and before a role switch between the target BS and the source BS or a release of the source BS; after providing the information to the source BS, receive an RRC reconfiguration message from the source BS, wherein the RRC reconfiguration message causes the UE to use a subset of the transition capability set to facilitate intra-frequency communication after adding and before the role switch or the release; and before the role switch or the release, use the subset of the transition capability set to communicate with the target BS.

[0011] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a UE, the one or more processors may perform the following operations: before a handover of the UE from a source BS to a target BS, provide the source BS with information identifying a set of transition capabilities of the UE, wherein the set of transition capabilities is about facilitating communication between the UE and the target BS before release of the source BS during the handover; after providing the information to the source BS, receive a handover command or a reconfiguration message from the source BS, wherein the handover command or the reconfiguration message causes the UE to use a subset of the set of transition capabilities during the handover to facilitate the communication with the target BS before the release; and before the release, use the subset of the transition capabilities to communicate with the target BS.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a UE, the one or more processors may perform the following operations: before adding a target BS as an SN, providing information identifying a transition capability set of the UE to a source BS operating as an MN, wherein the transition capability set is about facilitating intra-frequency communication between the UE after the addition and before a role switch between the target BS and the source BS or a release of the source BS; after providing the information to the source BS, receiving an RRC reconfiguration message from the source BS, wherein the RRC reconfiguration message causes the UE to use a subset of the transition capability set to facilitate intra-frequency communication after the addition and before the role switch or the release; and before the role switch or the release, using the subset of the transition capability set to communicate with the target BS.

[0013] In some aspects, a first device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may include: a unit for providing information identifying a set of transition capabilities of the first device to the second device prior to a handover of the first device from the second device to the third device, wherein the set of transition capabilities is related to facilitating communication between the first device and the third device prior to release of the second device during the handover; a unit for receiving a handover command or a reconfiguration message from the second device after providing the information to the second device, wherein the handover command or the reconfiguration message causes the first device to use a subset of the set of transition capabilities during the handover to facilitate the communication with the third device prior to the release; and a unit for communicating with the third device using the subset of the transition capabilities prior to the release.

[0014] In some aspects, a first device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may include: a unit for providing information identifying a transition capability set of the first device to a second device operating as an MN prior to the addition of a third device as an SN, wherein the transition capability set is about facilitating communication within a frequency between the first device after the addition and before a role switch between the third device and the second device or a release of the second device; a unit for receiving an RRC reconfiguration message from the second device after providing the information to the second device, wherein the RRC reconfiguration message causes the first device to use a subset of the transition capability set to facilitate communication within a frequency after the addition and before the role switch or the release; and a unit for communicating with the third device using the subset of the transition capability set prior to the role switch or the release.

[0015] In summary, aspects include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and processing systems as fully described herein with reference to and as illustrated by the accompanying drawings and description.

[0016] The foregoing has been fairly broadly summarized according to the features and technical advantages of the examples of the present disclosure, so that the following detailed description can be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples can be easily used as the basis for modifying or designing other structures for the same purpose of achieving the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and method of operation) and the associated advantages will be better understood according to the description below. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description, and is not intended to be a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to fully understand the above-mentioned features of the present disclosure, a more specific description of the invention briefly summarized above can be obtained by referring to various aspects (some of which are shown in the accompanying drawings). However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not considered to limit the scope of the present disclosure, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0019] Figure 2 is a block diagram conceptually illustrating an example of a base station in a wireless communication network communicating with a UE according to various aspects of the present disclosure.

[0020] Figure 3A is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network in accordance with various aspects of the present disclosure.

[0021] Figure 3B is a block diagram conceptually illustrating an example synchronization communication hierarchy in a wireless communication network in accordance with various aspects of the present disclosure.

[0022] Figure 4 is a block diagram conceptually illustrating an example slot format with a normal cyclic prefix in accordance with various aspects of the present disclosure.

[0023] Figure 5 An example logical architecture of a distributed radio access network (RAN) in accordance with various aspects of the present disclosure is shown.

[0024] Figure 6 An example physical architecture of a distributed RAN according to various aspects of the present disclosure is shown.

[0025] Figure 7 is a diagram illustrating an example of downlink (DL)-centric time slots in accordance with various aspects of the present disclosure.

[0026] Figure 8 is a diagram illustrating an example of uplink (UL)-centric time slots in accordance with various aspects of the present disclosure.

[0027] Fig. 9 is a diagram illustrating an example of transitions based on user equipment (UE) capabilities in accordance with various aspects of the present disclosure.

[0028] Fig.10 is a diagram illustrating example processes performed, for example, by a UE, according to various aspects of the present disclosure.

[0029] Fig.11 is a diagram illustrating example processes performed, for example, by a UE, according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0030] The following is a more complete description of various aspects of the present disclosure with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. More specifically, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether the aspect is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect. For example, using any number of aspects set forth herein, a device can be implemented or a method can be implemented. In addition, the scope of the present disclosure is intended to cover such a device or method implemented using other structures, functions, or structures and functions other than the various aspects of the present disclosure set forth herein or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0031] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0032] It should be noted that although various aspects may be described herein using terms commonly associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to communication systems based on other generations, such as 5G and later (including NR technology).

[0033] Figure 11 is a diagram showing a wireless network 100 in which various aspects of the present disclosure may be implemented. The wireless network 100 may be an LTE network or some other wireless network (e.g., a 5G or NR network). The wireless network 100 may include a plurality of BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0034] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0035] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (e.g., direct physical connections, virtual networks, and / or similar interfaces using any suitable transport networks).

[0036] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that is capable of relaying transmissions for other UEs. Figure 1 In the example shown in FIG. 1 , a relay station 110 d may communicate with a macro BS 110 a and a UE 120 d to facilitate communication between the BS 110 a and the UE 120 d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0037] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0038] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0039] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), an entertainment device (e.g., a music or video device, or a satellite radio unit, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0040] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide a connection to or to a network (e.g., a wide area network such as the Internet or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (such as a processor component, a memory component, etc.).

[0041] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0042] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol, vehicle-to-infrastructure (V2I) protocol, etc.), mesh network, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0043] As noted above, Figure 1 is provided as an example. Other examples may differ from those described above. Figure 1 Examples described.

[0044] Figure 2 Base station 110 and UE 120 (which may be Figure 11. Block diagram of a design 200 of a base station in a base station and a UE in a UE. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general, T≥1 and R≥1.

[0045] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, a synchronization signal may be generated using position coding to transmit additional information.

[0046] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0047] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component in the base station 110 may perform one or more techniques associated with the conversion based on UE capabilities, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in may perform or direct e.g. Fig.10 The process of 1000 Fig.11 The operations of process 1100 and / or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0049] In some aspects, UE 120 may include: means for providing information identifying a set of transition capabilities of the UE prior to handover of the UE from a source base station (BS) to a target BS and to the source BS, wherein the set of transition capabilities is related to facilitating communication between the UE and the target BS prior to release of the source BS during the handover; means for receiving a handover command or reconfiguration message from the source BS after providing the information to the source BS, wherein the handover command or reconfiguration message causes the UE to use a subset of the set of transition capabilities to facilitate communication with the target BS prior to release during the handover; and means for using the subset of transition capabilities to communicate with the target BS prior to release; and so on. In some aspects, such means may include combining Figure 2 One or more components of UE 120 are described.

[0050] In some aspects, UE 120 may include: a unit for providing information identifying a transition capability set of the UE to a source BS operating as an MN prior to the addition of a target BS as an SN, wherein the transition capability set is related to facilitating intra-frequency communication between the UE after the addition and before a role switch between the target BS and the source BS or a release of the source BS; a unit for receiving an RRC reconfiguration message from the source BS after providing the information to the source BS, wherein the RRC reconfiguration message causes the UE to use a subset of the transition capability set to facilitate intra-frequency communication after the addition and before the role switch or release; and a unit for communicating with the target BS using the subset of the transition capability set before the role switch or release; etc. In some aspects, such a unit may include a combination of Figure 2 One or more components of UE 120 are described.

[0051] As noted above, Figure 2 is provided as an example. Other examples may differ from those described above. Figure 2 Examples described.

[0052] Figure 3A An example frame structure 300 for frequency division duplex (FDD) in a telecommunication system (e.g., NR) is shown. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames (sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be divided into a set of Z (Z ≥ 1) subframes (e.g., with indices from 0 to Z-1). Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of time slots (e.g., in Figure 3A Each subframe has 2 m time slots, where m is the numerology used for transmission (e.g., 0, 1, 2, 3, 4, etc.). Each time slot may include a set of L symbol periods. For example, each time slot may include fourteen symbol periods (e.g., Figure 3A ), seven symbol periods, or another number of symbol periods. In the case where a subframe includes two slots (e.g., when m=1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices from 0 to 2L-1. In some aspects, the scheduling unit for FDD may be frame-based, subframe-based, slot-based, symbol-based, etc.

[0053] Although some techniques are described herein in conjunction with frames, subframes, time slots, etc., these techniques may also be applied to other types of wireless communication structures, which may be referred to in 5G NR using terms other than "frames," "subframes," "time slots," etc. In some aspects, a wireless communication structure may refer to a periodic, time-delimited communication unit defined by a wireless communication standard and / or protocol. Additionally or alternatively, a wireless communication structure may be used in conjunction with a wireless communication standard and / or protocol. Figure 3A The configurations of the wireless communication structures are different from those shown in FIG.

[0054] In some telecommunications (e.g., NR), a base station may send synchronization signals. For example, a base station may send a primary synchronization signal (PSS), a secondary synchronization signal (SSS), etc. on the downlink for each cell supported by the base station. The PSS and SSS may be used by the UE for cell search and acquisition. For example, the PSS may be used by the UE to determine symbol timing, and the SSS may be used by the UE to determine a physical cell identifier and frame timing associated with the base station. The base station may also send a physical broadcast channel (PBCH). The PBCH may carry certain system information, such as system information that supports initial access by the UE.

[0055] In some aspects, a base station may send a PSS, SSS, and / or PBCH according to a synchronization communication level (e.g., a synchronization signal (SS) level) including multiple synchronization communications (e.g., SS blocks), as described below in conjunction with Figure 3B Described.

[0056] Figure 3B is a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronous communication hierarchy. Figure 3B As shown in , the SS hierarchy may include an SS burst set, which may include multiple SS bursts (identified as SS burst 0 to SS burst B-1, where B is the maximum number of repetitions of the SS burst that can be sent by the base station). As further shown, each SS burst may include one or more SS blocks (identified as SS block 0 to SS block (b max_SS-1 ), where b max_SS-1 is the maximum number of SS blocks that can be carried by an SS burst). In some aspects, different SS blocks may be beamformed in different ways. A wireless node may send a set of SS bursts periodically, such as every X milliseconds, such as Figure 3B In some aspects, the SS burst set may have a fixed or dynamic length. Figure 3B is shown as Y milliseconds.

[0057] Figure 3B The SS burst set shown in is an example of a synchronous communication set, and other synchronous communication sets can be used in conjunction with the techniques described herein. In addition, Figure 3B The SS blocks shown in are examples of synchronous communications, and other synchronous communications may be used in conjunction with the techniques described herein.

[0058] In some aspects, an SS block includes resources that carry PSS, SSS, PBCH, and / or other synchronization signals (e.g., a third synchronization signal (TSS)) and / or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSS, and / or PBCH may be the same between each SS block of the SS burst. In some aspects, a single SS block may be included in an SS burst. In some aspects, an SS block may be at least four symbol periods in length, with each symbol carrying one or more of the PSS (e.g., occupying one symbol), the SSS (e.g., occupying one symbol), and / or the PBCH (e.g., occupying two symbols).

[0059] In some aspects, such as Figure 3BAs shown in , the symbols of the SS blocks are continuous. In some aspects, the symbols of the SS blocks are discontinuous. Similarly, in some aspects, one or more SS blocks of an SS burst may be sent in continuous radio resources (e.g., continuous symbol periods) during one or more time slots. Additionally or alternatively, one or more SS blocks of an SS burst may be sent in discontinuous radio resources.

[0060] In some aspects, an SS burst may have a burst period, whereby a base station may send an SS block of an SS burst according to the burst period. In other words, an SS block may repeat during each SS burst. In some aspects, an SS burst set may have a burst set period, whereby a base station may send an SS burst of an SS burst set according to a fixed burst set period. In other words, an SS burst may repeat during each SS burst set.

[0061] The BS may send system information (e.g., system information blocks (SIBs)) on a physical downlink shared channel (PDSCH) in certain slots. The base station may send control information / data on a physical downlink control channel (PDCCH) in C symbol periods of a slot, where B may be configurable for each slot. The base station may send traffic data and / or other data on the PDSCH in the remaining symbol periods of each slot.

[0062] As noted above, Figure 3A and 3B is provided as an example. Other examples may differ from those described above. Figure 3A and 3B Examples described.

[0063] Figure 4 An example slot format 410 with a normal cyclic prefix is ​​shown. The available time-frequency resources may be divided into resource blocks. Each resource block may cover a group of subcarriers (e.g., 12 subcarriers) in a slot and may include multiple resource elements. Each resource element may cover one subcarrier in a symbol period (e.g., in units of time) and may be used to send one modulation symbol, which may be real or complex valued.

[0064] The interlaced structure may be used for each of the downlink and uplink for FDD in certain telecommunication systems (e.g., NR). For example, Q interlaces with indices from 0 to Q-1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include time slots spaced apart by Q frames. Specifically, an interlace q may include time slots q, q+Q, q+2Q, etc., where q∈{0,...,Q-1}.

[0065] A UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria (e.g., received signal strength, received signal quality, path loss, etc.). The received signal quality may be quantified by a signal to noise and interference ratio (SNIR), or a reference signal received quality (RSRQ), or some other metric. The UE may operate in a significant interference scenario, where the UE may observe high interference from one or more interfering BSs.

[0066] Although aspects of the examples described herein may be associated with NR or 5G technology, aspects of the present disclosure may be applied with other wireless communication systems. New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., in addition to an air interface based on Orthogonal Frequency Division Multiple Access (OFDMA)) or a fixed transport layer (e.g., in addition to Internet Protocol (IP)). In various aspects, NR may utilize OFDM with CP (referred to herein as cyclic prefix OFDM or CP-OFDM) and / or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using time division duplex (TDD). In various aspects, NR may utilize OFDM with CP (referred to herein as CP-OFDM) and / or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD. NR may include enhanced mobile broadband (eMBB) services targeting wide bandwidth (e.g., 80 megahertz (MHz) and greater), millimeter wave (mmW) targeting high carrier frequencies (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatible MTC technologies, and / or mission critical targeting ultra-reliable low latency communication (URLLC) services.

[0067] In some aspects, a single component carrier bandwidth of 100 MHz may be supported. NR resource blocks may span 12 subcarriers with a subcarrier bandwidth of 60 or 120 kilohertz (kHz) in a 0.1 millisecond (ms) duration. Each radio frame may include 40 slots and have a length of 10 ms. Thus, each slot may have a length of 0.25 ms. Each slot may indicate a link direction (e.g., DL or UL) for data transmission, and the link direction for each slot may be switched dynamically. Each slot may include DL / UL data and DL / UL control data.

[0068] Beamforming may be supported and the beam direction may be dynamically configured. MIMO transmission with precoding may also be supported. MIMO configuration in DL may support up to 8 transmit antennas with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE may be supported. Aggregation of multiple cells with up to 8 serving cells may be supported. Alternatively, NR may support different air interfaces other than OFDM-based interfaces. NR networks may include entities such as a central unit or a distributed unit.

[0069] As noted above, Figure 4 is provided as an example. Other examples may differ from those described above. Figure 4 Examples described.

[0070] Figure 5 An example logical architecture of a distributed RAN 500 according to various aspects of the present disclosure is shown. A 5G access node 506 may include an access node controller (ANC) 502. The ANC may be a central unit (CU) of the distributed RAN 500. The backhaul interface to the next generation core network (NG-CN) 504 may terminate at the ANC. The backhaul interface to the adjacent next generation access node (NG-AN) may terminate at the ANC. The ANC may include one or more TRPs 508 (which may also be referred to as BS, NR BS, Node B, 5G NB, AP, gNB or some other terminology). As mentioned above, TRP may be used interchangeably with "cell".

[0071] The TRP 508 may be a distributed unit (DU). The TRP may be connected to one ANC (ANC 502) or more than one ANC (not shown). For example, for RAN sharing, Radio as a Service (RaaS), and service-specific ANC deployments, the TRP may be connected to more than one ANC. The TRP may include one or more antenna ports. The TRP may be configured to provide services to the UE individually (e.g., dynamically selected) or jointly (e.g., joint transmission).

[0072] The local architecture of RAN 500 can be used to illustrate the fronthaul definition. The architecture can be defined to support fronthaul solutions across different deployment types. For example, the architecture can be based at least in part on the sending network capabilities (e.g., bandwidth, latency, and / or jitter).

[0073] The architecture may share features and / or components with LTE. Next Generation AN (NG-AN) 510 may support dual connectivity with NR. NG-AN may share a common fronthaul for LTE and NR.

[0074] The architecture may enable collaboration between and among TRPs 508. For example, collaboration may be pre-set within and / or across TRPs via ANC 502. According to various aspects, an inter-TRP interface may not be required / existent.

[0075] According to various aspects, dynamic configuration of split logical functions may exist in the architecture of RAN 500. Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), Medium Access Control (MAC) protocols may be adaptively placed at ANC or TRP.

[0076] According to various aspects, a BS may include a central unit (CU) (eg, ANC 502) and / or one or more distributed units (eg, one or more TRPs 508).

[0077] As noted above, Figure 5 is provided as an example. Other examples may differ from those described above. Figure 5 Examples described.

[0078] Figure 6 An example physical architecture of a distributed RAN 600 according to aspects of the present disclosure is shown. A centralized core network unit (C-CU) 602 may host core network functions. The C-CU may be centrally deployed. C-CU functions may be offloaded (e.g., to Advanced Wireless Services (AWS)) to focus on handling peak capacity.

[0079] A centralized RAN unit (C-RU) 604 may host one or more ANC functions. Optionally, the C-RU may host core network functions locally. The C-RU may have a distributed deployment. The C-RU may be closer to the network edge.

[0080] A distributed unit (DU) 606 may host one or more TRPs. A DU may be located at the edge of a network with radio frequency (RF) capabilities.

[0081] As noted above, Figure 6 is provided as an example. Other examples may differ from those described above. Figure 6 Examples described.

[0082] Figure 7 700 is a diagram illustrating an example of a DL-centric time slot or wireless communication structure. The DL-centric time slot may include a control portion 702. The control portion 702 may be present at an initial or beginning portion of the DL-centric time slot. The control portion 702 may include various scheduling information and / or control information corresponding to various portions of the DL-centric time slot. In some configurations, the control portion 702 may be a physical downlink control channel (PDCCH), such as Figure 7 In some aspects, the control portion 702 may include legacy PDCCH information, shortened PDCCH (sPDCCH) information, a control format indicator (CFI) value (e.g., carried on a physical control format indicator channel (PCFICH)), one or more grants (e.g., downlink grant, uplink grant, etc.), etc.

[0083] The DL-centric time slot may also include a DL data portion 704. The DL data portion 704 may sometimes be referred to as the payload of the DL-centric time slot. The DL data portion 704 may include communication resources for transmitting DL data from a scheduling entity (e.g., a UE or BS) to a subordinate entity (e.g., a UE). In some configurations, the DL data portion 704 may be a physical DL shared channel (PDSCH).

[0084] The DL-centric time slot may also include a UL short burst portion 706. The UL short burst portion 706 may sometimes be referred to as a UL burst, a UL burst portion, a common UL burst, a short burst, a UL short burst, a common UL short burst, a common UL short burst portion, and / or various other appropriate terms. In some aspects, the UL short burst portion 706 may include one or more reference signals. Additionally or alternatively, the UL short burst portion 706 may include feedback information corresponding to various other portions of the DL-centric time slot. For example, the UL short burst portion 706 may include feedback information corresponding to the control portion 702 and / or the data portion 704. Non-limiting examples of information that may be included in the UL short burst portion 706 include an ACK signal (e.g., a physical uplink control channel (PUCCH) ACK, a physical uplink shared channel (PUSCH) ACK, an immediate ACK), a NACK signal (e.g., a PUCCH NACK, a PUSCH NACK, an immediate NACK), a scheduling request (SR), a buffer status report (BSR), a hybrid automatic repeat request (HARQ) indicator, a channel state indication (CSI), a channel quality indicator (CQI), a sounding reference signal (SRS), a demodulation reference signal (DMRS), PUSCH data, and / or various other suitable types of information. The UL short burst portion 706 may include additional or alternative information, such as information related to a random access channel (RACH) procedure, a scheduling request, and various other suitable types of information.

[0085] like Figure 7As shown, the end of the DL data portion 704 can be separated in time from the beginning of the UL short burst portion 706. This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and / or various other appropriate terms. This separation provides time for switching from DL communication (e.g., a receive operation performed by a slave entity (e.g., a UE)) to UL communication (e.g., a transmit operation performed by a slave entity (e.g., a UE)). The foregoing is an example of a DL-centric wireless communication structure, and alternative structures with similar features may exist without necessarily departing from the aspects described herein.

[0086] As noted above, Figure 7 is provided as an example. Other examples may differ from those described above. Figure 7 Examples described.

[0087] Figure 8 800 is a diagram illustrating an example of a UL-centric timeslot or wireless communication structure. The UL-centric timeslot may include a control portion 802. The control portion 802 may be present at the initial or beginning portion of the UL-centric timeslot. Figure 8 The control portion 802 in the embodiment may be similar to the above reference Figure 7 The control portion 702 described above. The UL-centric time slot may also include a UL long burst portion 804. The UL long burst portion 804 may sometimes be referred to as the payload of the UL-centric time slot. The UL portion may refer to communication resources used to transmit UL data from a subordinate entity (e.g., a UE) to a scheduling entity (e.g., a UE or a BS). In some configurations, the control portion 802 may be a physical DL control channel (PDCCH) transmission.

[0088] like Figure 8 As shown, the end of the control portion 802 can be separated in time from the beginning of the UL long burst portion 804. This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and / or various other appropriate terms. This separation provides time for switching from DL communication (e.g., receiving operations performed by the scheduling entity) to UL communication (e.g., transmitting performed by the scheduling entity).

[0089] The UL-centric timeslot may also include a UL short burst portion 806 . Figure 8 The UL short burst portion 806 in the embodiment may be similar to that described above with reference to Figure 7 The UL short burst portion 706 described above may include the combination of Figure 7 Any of the information described herein. The foregoing is one example of a UL-centric wireless communication structure, and alternative structures with similar features may exist without necessarily departing from aspects described herein.

[0090] In some cases, two or more subordinate entities (e.g., UEs) can use side link signals to communicate with each other. Real-world applications of such side link communications may include public safety, proximity services, UE-to-network relays, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical meshing, and / or various other appropriate applications. Typically, a side link signal may refer to a signal transmitted from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without the need to relay the communication through a scheduling entity (e.g., UE or BS), even if the scheduling entity may be used for scheduling and / or control purposes. In some aspects, a licensed spectrum may be used to transmit side link signals (unlike wireless local area networks that typically use unlicensed spectrum).

[0091] In one example, a wireless communication structure (e.g., a frame) may include both UL-centric time slots and DL-centric time slots. In this example, the ratio of UL-centric time slots to DL-centric time slots in a frame may be dynamically adjusted based at least in part on the amount of UL data and DL data transmitted. For example, if there is more UL data, the ratio of UL-centric time slots to DL-centric time slots may be increased. Conversely, if there is more DL data, the ratio of UL-centric time slots to DL-centric time slots may be reduced.

[0092] As noted above, Figure 8 is provided as an example. Other examples may differ from those described above. Figure 8 Examples described.

[0093] For UE mobility in LTE and NR, reducing the interruption of communication when the UE switches from communicating with one BS to communicating with another BS is important for reducing latency, maintaining reliability of communication, etc. One possible way to switch the UE from one BS to another BS while minimizing the interruption is to have the UE communicate with both BSs simultaneously. During this transition, the UE may not be able to use the full transmit and receive capabilities of the UE due to the configuration of the two BSs, due to the configuration of the UE, etc.

[0094] Some techniques and devices described herein provide coordination of the use of UE capabilities during a transition of the UE from one BS to another BS. For example, the UE may provide information to the source BS that identifies a set of transition capabilities that the UE may use to communicate with both the source BS and the target BS. The source BS may then select a target BS based on the set of transition capabilities so that the UE may communicate with both the source BS and the target BS simultaneously during the transition of the UE. This improves the communication of the UE by reducing or eliminating interruptions to the communication during the transition of the UE. In addition, this reduces or eliminates delays in the communication that would otherwise be associated with transitioning the UE from the source BS to the target BS.

[0095] Fig. 9 9 is a diagram illustrating an example 900 of a transition based on UE capabilities according to various aspects of the present disclosure. Fig. 9 As shown, example 900 includes a UE (eg, UE 120), a source BS (eg, source BS 110), and a target BS (eg, target BS 110).

[0096] As in Fig. 9 9 and indicated by reference numeral 910, the UE may provide information identifying the UE's transition capability set to the source BS. For example, the UE may provide the information prior to a handover of the UE from the source BS to the target BS.

[0097] The transition capability set may facilitate communication between the UE and the target BS prior to release of the source BS during a handover. For example, between receiving a handover command (e.g., for unconditional handover) or a reconfiguration message (e.g., for conditional handover) from the source BS and the release of the source BS, the UE may use the capability set to communicate with both the source BS and the target BS. The conversion capability set may indicate the full capabilities of the UE (e.g., the full transmission capabilities of the UE), and may include simultaneous reception capability (e.g., the ability to simultaneously receive communications from both the source BS and the target BS), simultaneous transmission capability (e.g., the ability to simultaneously provide communications to the source BS and the target BS, different combinations of physical channels from the source BS and the target BS, etc.), time domain multiplexing (TDM) reception capability (e.g., a TDM mode that the UE can use to receive communications from both the source BS and the target BS in a time slot, a switching delay required for the UE to switch between the source BS and the target BS to receive communications, etc.), time domain multiplexing transmission capability (e.g., a TDM mode that the UE can use to receive communications from both the source BS and the target BS in a time slot, a switching delay required for the UE to switch between the source BS and the target BS to receive communications, etc.), carrier aggregation capability (e.g., the ability of the UE to use multiple carriers across the source BS and the target BS), data rate capability (e.g., whether the UE supports MIMO communications, etc.), etc. Regarding the simultaneous reception capability and the simultaneous transmission capability, the simultaneous transmission capability is related to the simultaneous transmission of multiple communications associated with the same physical channel (for example, two PUSCH communications) or multiple communications associated with different physical channels (for example, PUSCH communication and PUCCH communication), and the simultaneous reception capability is related to the simultaneous reception of multiple communications associated with the same physical channel or associated with different physical channels.

[0098] The transition capability set may be UE-specific (e.g., one capability set for the UE), band-specific (e.g., one capability set per band), band-combination-specific (e.g., one capability set for a combination of bands associated with the source BS and the target BS), or band-specific per band combination (e.g., one capability set per band per band combination), etc. The transition capability set may be specific to a portion of a handover. For example, the UE may use a first subset of transition capabilities until the UE initiates access to the target BS, and may use a second subset of transition capabilities from the initiation of access to the target BS until release of the source BS. As other examples, the UE may use different subsets before and after the start of a RACH attempt, before and after the RACH is completed, etc. This facilitates customization and flexibility in configuring the UE at different times during a handover based on different computing resource requirements at different times, thereby reducing or eliminating situations that may negatively impact the operation of the UE, such as when the UE has idle computing resources or when the UE is experiencing excessive consumption of computing resources.

[0099] The UE may provide information identifying the transition capability set to the source BS (e.g., in association with connecting to the source BS). Additionally or alternatively, the source BS may request information identifying the transition capability set from the UE (e.g., in association with connecting the UE to the source BS). In some aspects, rather than the UE providing the information identifying the transition capability set, the source BS may perform a lookup for the transition capability set (or may request another device to perform the lookup) based at least in part on an identifier of the UE, a hardware or software configuration of the UE, etc.

[0100] As indicated by reference numeral 920, the source BS may select a target BS for the UE based at least in part on the transition capability set. For example, the source BS may select the target BS based at least in part on whether the target BS has the capability to facilitate the transition of the UE in the manner described herein, the service associated with the UE (e.g., whether the service is an eMBB service, a URLLC service, etc.), etc. As a specific example, if the UE is capable of using a specific TDM mode to facilitate communication between the source BS and the target BS during the handover, the source BS may select a target BS capable of using the same TDM mode.

[0101] As indicated by reference numeral 930, the source BS may provide information identifying a subset of the set of transition capabilities to the target BS. For example, the source BS may provide information identifying a subset of the set of transition capabilities after selecting the target BS. The subset may include one or more transition capabilities in the set of transition capabilities that the source BS determines the target BS can use. For example, if the UE is capable of using simultaneous reception and transmission and various TDM modes, but the target BS is only capable of using one specific TDM mode, the source BS may select a specific TDM mode that matches the capabilities of the target BS and may provide the information to the target BS.

[0102] As indicated by reference numeral 940, the target BS may approve the subset of the transition capability set for use by the UE. For example, after the source BS has selected the target BS, the target BS may approve the subset after receiving information identifying the subset of the transition capability set. The target BS may approve the subset based at least in part on determining that the subset of the transition capability set matches capabilities of the target BS.

[0103] The target BS may provide the source BS with a handover command or reconfiguration message for handover of the UE from the source BS to the target BS. For example, the target BS may provide the source BS with a handover command or reconfiguration message after approving a subset of the conversion capability set.

[0104] As shown in the reference numeral 950, the source BS may provide a handover command or reconfiguration message to the UE. For example, the source BS may provide a handover command or reconfiguration message to the UE after receiving the handover command or reconfiguration message from the target BS. The handover command or reconfiguration message may enable the UE to use a subset of the conversion capability set during the handover to facilitate communication with the target BS before the release of the source BS. For example, the handover command or reconfiguration message may identify a subset of the conversion capability set that the UE will use during the handover to communicate with the source BS and the target BS during the handover. The handover command or reconfiguration message may be related to causing the UE to perform one or more actions related to the handover (e.g., performing a RACH process with the target BS). In some aspects, the handover command or reconfiguration message may be related to causing a conditional handover. For example, the handover command or reconfiguration message may identify a target BS set and corresponding conditions, which will control when the UE is switched and to which target BSs.

[0105] As shown in reference numeral 960, the UE may configure a subset of the transition capability set. For example, the UE may configure the subset of the transition capability set based at least in part on receiving a handover command or a reconfiguration message. When configuring the subset of the transition capability set, the UE may activate the subset, may deactivate remaining transition capabilities not included in the subset, and so on.

[0106] As indicated by reference numeral 970, the UE may communicate with the source BS and the target BS during the handover. For example, the UE may communicate with the source BS and the target BS after receiving a handover command or a reconfiguration message and before release of the source BS (e.g., while maintaining connection with the source BS).

[0107] The UE may attempt to access the target BS in association with the handover. For example, the UE may attempt to access the target BS after receiving the handover command or reconfiguration message and before release of the source BS. Continuing with the previous example, the UE may initiate a RACH procedure with the target BS after receiving the handover command or reconfiguration message. Depending on whether different capability subsets need to be used at different times during the handover, the UE may stop using the first capability subset and may start using the second capability subset (e.g., after configuring the second capability subset). For example, the UE may stop using the first transition capability subset based at least in part on initiating access to the target BS, completing access to the target BS, and the like.

[0108] The UE may release the source BS. For example, the UE may release the source BS after successfully accessing the target BS and establishing a connection with the target BS. After releasing the source BS, the UE may stop using a subset of the transition capability set and may resume normal use of the UE's capabilities. If an attempt to access the target BS fails, the UE may maintain a connection with the source BS. Because the techniques and apparatus described herein provide for maintaining a connection with the source BS during a handover to the target BS, interruptions to the UE's communications are reduced or eliminated, thereby improving the operation of the UE, reducing or eliminating delays that would otherwise occur due to failed access attempts, and the like.

[0109] Although described in the context of a switch and a switch command or reconfiguration message Fig. 9 , but one or more of the above aspects apply to the NR secondary node (SN) process. In this context, the source BS can operate as a master node (MN) connected to the UE, and the UE can provide information identifying the conversion capability set to the source BS in a manner similar to the manner described above. A subset of the UE's conversion capability set can be selected in a manner similar to the manner described above (for example, the source BS and the target BS can communicate with each other to select the subset). After the subset has been selected, the UE, the source BS, and the target BS communicate with each other to add the target BS as an SN to the UE. For example, the UE can receive an RRC reconfiguration message (rather than a handover command or a reconfiguration message) from the source BS. The RRC reconfiguration message can be associated with causing the target BS to be added to the UE as an SN, causing the UE to use a subset of the conversion capability set, and the like.

[0110] After adding the target BS as an SN, the UE, the source BS and the target BS can communicate to perform the role switching of the source BS and the target BS. In this case, the target BS becomes an MN, and the source BS becomes an SN. After the addition of the target BS and during the role switching, the UE can use a subset of the conversion capability set to communicate with the target BS while maintaining the connection with the source BS. For example, these communications can be intra-frequency communications (e.g., TDD communications) with both the source BS and the target BS. After the role switching, the UE can release the source BS.

[0111] As noted above, Fig. 9 is provided as an example. Other examples may differ from those described above. Fig. 9 Examples described.

[0112] Fig.10 1 is a diagram illustrating an example process 1000 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 1000 is an example of operations in which a UE (eg, UE 120, etc.) performs operations associated with transitioning based on UE capabilities.

[0113] like Fig.10 As shown, in some aspects, process 1000 may include: prior to a handover of the UE from a source base station (BS) to a target BS, providing information identifying a transition capability set of the UE to the source BS, wherein the transition capability set is related to facilitating communication between the UE and the target BS prior to release of the source BS during the handover (block 1010). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may provide information identifying a transition capability set of the UE to the source BS prior to a handover of the UE from the source BS to the target BS, as described above. In some aspects, the transition capability set is related to facilitating communication between the UE and the target BS prior to release of the source BS during the handover.

[0114] like Fig.10As further shown, in some aspects, process 1000 may include, after providing the information to the source BS, receiving a handover command or reconfiguration message from the source BS, wherein the handover command or reconfiguration message causes the UE to use a subset of the transition capability set during the handover to facilitate communication with the target BS before release (block 1020). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive the handover command or reconfiguration message from the source BS after providing the information to the source BS, as described above. In some aspects, the handover command or reconfiguration message causes the UE to use a subset of the transition capability set during the handover to facilitate communication with the target BS before release.

[0115] like Fig.10 As further shown, in some aspects, process 1000 may include, prior to releasing, communicating with the target BS using the subset of the transition capabilities (block 1030). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, MOD 254, controller / processor 280, etc.) may communicate with the target BS using the subset of the transition capabilities prior to releasing, as described above.

[0116] Process 1000 may include additional aspects, such as any single implementation or any combination of the aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0117] In a first aspect, a conversion capability set indicates full UE capabilities of a UE and includes at least one of: simultaneous receive capability, simultaneous transmit capability, time domain multiplexing receive capability, time domain multiplexing transmit capability, carrier aggregation capability, or data rate capability. In a second aspect (in combination with the first aspect), the simultaneous receive capability is about simultaneously receiving multiple communications associated with the same physical channel or associated with different physical channels, and the simultaneous transmit capability is about simultaneously transmitting multiple communications associated with the same physical channel or associated with different physical channels. In a third aspect (alone or in combination with any one or more of the first and second aspects), the conversion capability set is UE-specific, band-specific, band-combination-specific, or band-specific per band-combination.

[0118] In a fourth aspect (alone or in combination with any one or more of the first to third aspects), the transition capability set is specific to a portion of the handover, and another subset of the transition capability set is specific to another portion of the handover. In a fifth aspect (alone or in combination with any one or more of the first to fourth aspects), the target BS is selected by the source BS based at least in part on the transition capability set.

[0119] In a sixth aspect (combined with the fifth aspect), a subset of the set of transition capabilities is to be approved by the target BS after the target BS has been selected. In a seventh aspect (alone or in combination with any one or more of the first to sixth aspects), a handover command or reconfiguration message for handover is provided by the target BS to the UE via the source BS.

[0120] In an eighth aspect (alone or in combination with any one or more of the first to seventh aspects), the handover command or reconfiguration message is related to making the conditional handover as a handover. In a ninth aspect (alone or in combination with any one or more of the first to eighth aspects), the UE may configure a subset of the transition capability set based at least in part on receiving a handover command or reconfiguration message from a source BS.

[0121] In the tenth aspect (alone or in combination with any one or more aspects from the first to the ninth aspect), after receiving a handover command or a reconfiguration message, the UE may attempt to access the target BS in association with the handover, and may configure a subset of the transition capability set in association with the attempted access to the target BS. In the eleventh aspect (alone or in combination with any one or more aspects from the first to the tenth aspect), the UE may stop using another subset of the transition capability set based at least in part on receiving the handover command or the reconfiguration message, based at least in part on attempting to access the target BS, and may configure a subset of the transition capability set based at least in part on stopping using another subset of the transition capability set based at least in part on receiving the handover command or the reconfiguration message.

[0122] In the twelfth aspect (alone or in combination with any one or more aspects of the first to eleventh aspects), after receiving the handover command or reconfiguration message, the UE may release the source BS, and may stop using the subset of the transition capability set based at least in part on releasing the source BS. In the thirteenth aspect (alone or in combination with any one or more aspects of the first to twelfth aspects), before providing the information to the source BS, the UE may receive a request for information from the source BS.

[0123] Although Fig.10Example blocks of process 1000 are shown, but in some aspects, process 1000 may include Fig.10 The blocks depicted in the process 1000 may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1000. Additionally or alternatively, two or more blocks of the blocks of process 1000 may be executed in parallel.

[0124] Fig.11 1 is a diagram illustrating an example process 1100, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 1100 is an example of operations in which a UE (eg, UE 120, etc.) performs transitions based on UE capabilities.

[0125] like Fig.11 As shown, in some aspects, process 1100 may include: providing information identifying a transition capability set of the UE to a source BS operating as a master node (MN) prior to the addition of a target BS as a secondary node (SN), wherein the transition capability set is about facilitating intra-frequency communication between the UE and the target BS after the addition and before a role switch of the target BS and the source BS or a release of the source BS (block 1110). For example, the UE (e.g., using the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, etc.) may provide information identifying the transition capability set of the UE to the source BS operating as a MN prior to the addition of the target BS as the SN, as described above. In some aspects, the transition capability set is about facilitating intra-frequency communication between the UE and the target BS after the addition and before a role switch of the target BS and the source BS or a release of the source BS.

[0126] like Fig.11 As further shown, in some aspects, process 1100 may include, after providing the information to the source BS, receiving a radio resource control (RRC) reconfiguration message from the source BS, wherein the RRC reconfiguration message causes the UE to use a subset of the transition capability set to facilitate communications after the addition and before the role switch or release (block 1120). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive the RRC reconfiguration message from the source BS after providing the information to the source BS, as described above. In some aspects, the RRC reconfiguration message causes the UE to use a subset of the transition capability set to facilitate communications after the addition and before the role switch or release.

[0127] like Fig.11As further shown, in some aspects, process 1100 may include: communicating with the target BS using a subset of the transition capability set prior to the role switch or release (block 1130). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, MOD 254, controller / processor 280, etc.) may communicate with the target BS using a subset of the transition capability set prior to the role switch or release, as described above.

[0128] Process 1100 may include additional aspects, such as any single implementation or any combination of the aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0129] In a first aspect, a conversion capability set indicates full UE capabilities of a UE and includes at least one of: simultaneous receive capability, simultaneous transmit capability, time domain multiplexing receive capability, time domain multiplexing transmit capability, carrier aggregation capability, or data rate capability. In a second aspect (in combination with the first aspect), the simultaneous receive capability is about simultaneously receiving multiple communications associated with the same physical channel or associated with different physical channels, and the simultaneous transmit capability is about simultaneously transmitting multiple communications associated with the same physical channel or associated with different physical channels. In a third aspect (alone or in combination with one or more of the first and second aspects), the conversion capability set is UE-specific, band-specific, band-combination-specific, or band-specific per band-combination.

[0130] In a fourth aspect (alone or in combination with any one or more of the first to third aspects), the conversion capability set is specific to a portion of the addition, and another subset of the conversion capability set is specific to another portion of the addition. In a fifth aspect (alone or in combination with any one or more of the first to fourth aspects), the target BS is selected by the source BS based at least in part on the conversion capability set. In a sixth aspect (in combination with the fifth aspect), the subset of the conversion capability set is to be approved by the target BS after the target BS has been selected.

[0131] In a seventh aspect (alone or in combination with any one or more of the first to sixth aspects), an RRC reconfiguration message for adding is provided by the target BS to the UE via the source BS. In an eighth aspect (alone or in combination with any one or more of the first to seventh aspects), the RRC reconfiguration message is related to making conditional addition as addition.

[0132] In the ninth aspect (alone or in combination with any one or more of the first to eighth aspects), the UE may configure a subset of the transition capability set based at least in part on receiving an RRC reconfiguration message from the source BS. In the tenth aspect (alone or in combination with any one or more of the first to ninth aspects), after receiving the RRC reconfiguration message, the UE may attempt to access the target BS in association with the addition, and may configure a subset of the transition capability set in association with the attempt to access the target BS.

[0133] In the eleventh aspect (alone or in combination with any one or more of the first to tenth aspects), the UE may stop using another subset of the transition capability set based at least in part on receiving an RRC reconfiguration message, based at least in part on attempting to access the target BS, and may configure a subset of the transition capability set based at least in part on stopping using another subset of the transition capability set based at least in part on receiving an RRC connection reconfiguration message. In the twelfth aspect (alone or in combination with any one or more of the first to eleven aspects), the target BS is added as an SN for dual connection with the source BS.

[0134] In the thirteenth aspect (combined with the twelfth aspect), at least in part based on the target BS having been added as an SN, the target BS is switched to operate as an MN in association with the role switch, and the source BS is switched to operate as an SN in association with the role switch. In the fourteenth aspect (alone or in combination with any one or more of the first to thirteenth aspects), after receiving the RRC reconfiguration message, the UE may release the source BS, and may stop using a subset of the transition capability set based at least in part on releasing the source BS. In the fifteenth aspect (alone or in combination with any one or more of the first to fourteenth aspects), before providing information to the source BS, the UE may receive a request for information from the source BS.

[0135] Although Fig.11 Example blocks of process 1100 are shown, but in some aspects process 1100 may include Fig.11 The blocks depicted in the process 1100 may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1100. Additionally or alternatively, two or more blocks in the blocks of the process 1100 may be executed in parallel.

[0136] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the various aspects.

[0137] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software.

[0138] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0139] It will be apparent that the systems and / or methods described herein may be implemented with various forms of hardware, firmware, and / or combinations of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting in any respect. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, it being understood that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0140] Even if the specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically recorded in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below can only directly depend on one claim, the disclosure of various aspects includes the combination of each dependent claim with each other claim in the claim set. The phrase "at least one of" referring to the list of items refers to any combination of those items, including a single member. For example, "at least one of a, b or c" is intended to cover any combination of a, b, c, ab, ac, bc and abc, and with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other ordering of a, b and c).

[0141] None of the elements, actions or instructions used herein should be interpreted as key or necessary, unless clearly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more projects (e.g., related projects, unrelated projects, combinations of related projects and unrelated projects, etc.), and can be used interchangeably with "one or more". In the case of only expecting one project, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "having" and / or similar terms are intended to be open terms. In addition, unless otherwise clearly stated, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A method of wireless communication performed by a user equipment UE, comprising: providing, prior to handover of the UE from a source base station BS to a target BS and to the source BS, information identifying a transition capability set of the UE, wherein the transition capability set is related to communication between the UE and the target BS prior to release of the source BS during the handover; After providing the information to the source BS, receiving a handover command or a reconfiguration message from the source BS, wherein the handover command or the reconfiguration message identifies a subset of the transition capability set and causes the UE to use the subset of the transition capability set for the communication with the target BS before the release during the handover; and Prior to the releasing, communicating with the target BS using the subset of the transition capability set.

2. The method according to claim 1, wherein: The conversion capability set includes the following conversion capabilities: Simultaneous receiving capability, Simultaneous sending capability, Time domain multiplexing receiving capability, Time domain multiplexing transmission capability, Carrier aggregation capability, or Data rate capability.

3. The method according to claim 2, in, The simultaneous reception capability is related to the simultaneous reception of multiple communications associated with the same physical channel or associated with different physical channels, and The simultaneous transmission capability is related to simultaneously transmitting multiple communications associated with the same physical channel or associated with different physical channels.

4. The method according to claim 1, wherein: The conversion capability set is UE-specific, band-specific, band-combination-specific, or band-specific per band-combination.

5. The method according to claim 1, in, The set of switching capabilities is specific to a time-dependent portion of the switch, and Therein, another subset of the set of transition capabilities is specific to another time-dependent portion of the switch.

6. The method according to claim 1, wherein: The target BS is selected by the source BS based at least in part on the set of transition capabilities.

7. The method according to claim 6, wherein: The subset of the transition capability set is to be approved by the target BS after the target BS has been selected.

8. The method according to claim 1, wherein: The handover command or reconfiguration message for the handover is provided by the target BS to the UE via the source BS.

9. The method according to claim 1, wherein: The handover command or reconfiguration message is related to causing a conditional handover as the handover.

10. The method according to claim 1, further comprising: The subset of the set of transition capabilities is configured based at least in part on receiving the handover command or reconfiguration message from the source BS.

11. The method according to claim 1, wherein: Communicating with the target BS includes: After receiving the handover command or reconfiguration message, attempting to access the target BS in association with the handover; and The subset of the transition capability set is configured in association with attempting to access the target BS.

12. The method according to claim 1, further comprising: ceasing to use another subset of the set of transition capabilities based at least in part on receiving the handover command or reconfiguration message and based at least in part on attempting to access the target BS; as well as The subset of the set of transition capabilities is configured based at least in part on receiving the switch command or reconfiguration message and based at least in part on ceasing to use the other subset of the set of transition capabilities.

13. The method according to claim 1, further comprising: After receiving the handover command or reconfiguration message, releasing the source BS; as well as The subset of the set of transition capabilities is discontinued based at least in part on releasing the source BS.

14. The method according to claim 1, further comprising: Prior to providing the information to the source BS, a request for the information is received from the source BS.

15. A method of wireless communication performed by a user equipment UE, comprising: providing, prior to the addition of a target base station BS as a secondary node SN and to a source BS operating as a master node MN, information identifying a transition capability set of the UE, wherein the transition capability set is about communicating within a frequency between the UE and the target BS after the addition and before a role switch between the target BS and the source BS; After providing the information to the source BS, receiving a radio resource control RRC reconfiguration message from the source BS, wherein the RRC reconfiguration message identifies a subset of the transition capability set and causes the UE to use the subset of the transition capability set for the communication after the adding and before the role switching; and Prior to the role switch or release of the source BS, the subset of the transition capability set is used to communicate with the target BS.

16. The method according to claim 15, wherein: The conversion capability set includes the following conversion capabilities: Simultaneous receiving capability, Simultaneous sending capability, Time domain multiplexing receiving capability, Time domain multiplexing transmission capability, Carrier aggregation capability, or Data rate capability.

17. The method according to claim 16, in, The simultaneous reception capability is related to the simultaneous reception of multiple communications associated with the same physical channel or associated with different physical channels, and The simultaneous transmission capability is related to simultaneously transmitting multiple communications associated with the same physical channel or associated with different physical channels.

18. The method according to claim 15, wherein: The conversion capability set is UE-specific, band-specific, band-combination-specific, or band-specific per band-combination.

19. The method according to claim 15, in, The set of transformation capabilities is specific to a time-dependent portion of the addition, and Therein, another subset of the set of conversion capabilities is specific to another time-dependent portion of the addition.

20. The method according to claim 15, wherein: The target BS is selected by the source BS based at least in part on the set of transition capabilities.

21. The method according to claim 20, wherein: The subset of the transition capability set is to be approved by the target BS after the target BS has been selected.

22. The method according to claim 15, wherein: The RRC reconfiguration message for the adding is provided by the target BS to the UE via the source BS.

23. The method according to claim 15, wherein: The RRC reconfiguration message is related to causing a conditional addition as the addition.

24. The method of claim 15, further comprising: The subset of the transition capabilities set is configured based at least in part on receiving the RRC reconfiguration message from the source BS.

25. The method of claim 15, wherein: Communicating with the target BS includes: after receiving the RRC reconfiguration message, attempting to access the target BS in association with the adding; and The subset of the transition capability set is configured in association with attempting to access the target BS.

26. The method of claim 15, further comprising: ceasing to use another subset of the set of transition capabilities based at least in part on receiving the RRC reconfiguration message and based at least in part on attempting to access the target BS; as well as The subset of the set of transition capabilities is configured based at least in part on receiving the RRC reconfiguration message and based at least in part on ceasing to use the other subset of the set of transition capabilities.

27. The method of claim 15, wherein: The target BS is added as the SN for dual connectivity with the source BS.

28. The method according to claim 27, wherein: Based at least in part on the target BS having been added as the SN, the target BS is switched to operate as the MN in association with the role switch, and the source BS is switched to operate as the SN in association with the role switch.

29. The method according to claim 28, further comprising: After receiving the RRC reconfiguration message, releasing the source BS; as well as The subset of the set of transition capabilities is discontinued based at least in part on releasing the source BS.

30. The method of claim 15, further comprising: Prior to providing the information to the source BS, a request for the information is received from the source BS.

31. A user equipment UE for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: providing, prior to handover of the UE from a source base station BS to a target BS and to the source BS, information identifying a transition capability set of the UE, wherein the transition capability set is related to communication between the UE and the target BS prior to release of the source BS during the handover; After providing the information to the source BS, receiving a handover command or a reconfiguration message from the source BS, wherein the handover command or the reconfiguration message identifies a subset of the transition capability set and causes the UE to use the subset of the transition capability set for the communication with the target BS before the release during the handover; and Prior to the releasing, communicating with the target BS using the subset of the transition capability set.

32. A user equipment UE for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: providing, prior to the addition of a target base station BS as a secondary node SN and to a source BS operating as a master node MN, information identifying a transition capability set of the UE, wherein the transition capability set is about intra-frequency communication between the UE after the addition and before a role switch between the target BS and the source BS; After providing the information to the source BS, receiving a radio resource control RRC reconfiguration message from the source BS, wherein the RRC reconfiguration message identifies a subset of the transition capability set and causes the UE to use the subset of the transition capability set for the communication after the adding and before the role switching; and Prior to the role switch or release of the source BS, the subset of the transition capability set is used to communicate with the target BS.

33. A non-transitory computer readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user equipment UE, cause the one or more processors to perform the following operations: providing, prior to handover of the UE from a source base station BS to a target BS and to the source BS, information identifying a transition capability set of the UE, wherein the transition capability set is related to communication between the UE and the target BS prior to release of the source BS during the handover; After providing the information to the source BS, receiving a handover command or a reconfiguration message from the source BS, wherein the handover command or the reconfiguration message identifies a subset of the transition capability set and causes the UE to use the subset of the transition capability set for the communication with the target BS before the release during the handover; and Prior to the releasing, communicating with the target BS using the subset of the transition capability set.

34. A non-transitory computer readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user equipment UE, cause the one or more processors to perform the following operations: providing, prior to the addition of a target base station BS as a secondary node SN and to a source BS operating as a master node MN, information identifying a transition capability set of the UE, wherein the transition capability set is about intra-frequency communication between the UE after the addition and before a role switch between the target BS and the source BS; After providing the information to the source BS, receiving a radio resource control RRC reconfiguration message from the source BS, wherein the RRC reconfiguration message identifies a subset of the transition capability set and causes the UE to use the subset of the transition capability set for the communication after the adding and before the role switching; and Prior to the role switch or release of the source BS, the subset of the transition capability set is used to communicate with the target BS.

35. A first apparatus for wireless communication, comprising: means for providing, prior to a handover of the first device from the second device to a third device and to the second device, information identifying a set of transition capabilities of the first device, wherein the set of transition capabilities is related to communications between the first device and the third device prior to release of the second device during the handover; means for receiving, after providing the information to the second device, a handover command or a reconfiguration message from the second device, wherein the handover command or the reconfiguration message identifies a subset of the set of transition capabilities and causes the first device to use the subset of the set of transition capabilities for the communication with the third device prior to the releasing during the handover; and means for communicating with the third device using the subset of the set of transition capabilities prior to the releasing.

36. A first apparatus for wireless communication, comprising: means for providing, prior to the addition of a third device as a secondary node SN and to a second device operating as a primary node MN, information identifying a set of transition capabilities of the first device, wherein the set of transition capabilities is about communicating within a frequency between the first device after the addition and before a role switch between the third device and the second device; means for receiving a radio resource control (RRC) reconfiguration message from the second apparatus after providing the information to the second apparatus, wherein the RRC reconfiguration message identifies a subset of the transition capability set and causes the first apparatus to use the subset of the transition capability set for the communications after the adding and before the role switching; and Means for communicating with the third device using the subset of the transition capability set prior to the role switch or release of the source base station.

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