Wireless communication method for determining TX or RX switching
Patent Information
- Application Number
- PCT/CN2025/085960
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-10-01
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Figure CN2025085960_01102026_PF_FP_ABST
Abstract
Description
WIRELESS COMMUNICATION METHOD FOR DETERMINING TX OR RX SWITCHINGTECHNICAL FIELD
[0001] The present disclosure generally relates to wireless communication technology, and in particular to a method for wireless communication, a wireless communication method in Random Access process, a wireless communication device and a storage medium.BACKGROUND
[0002] The evolution of wireless communication technologies has necessitated the development of more efficient and flexible uplink (UL) and downlink (DL) transmission schemes, particularly in the context of multi-carrier operations. The 3rd Generation Partnership Project (3GPP) Release 16 (Rel-16) has introduced certain specifications for multi-carrier UL operations, which, despite their advancements, present notable limitations that could potentially hinder achieving optimal UL data rates, spectrum utilization, and UL capacity.
[0003] In Rel-16 specifications, a user equipment (UE) with two transmit (Tx) capabilities is restricted to being configured with at most two UL bands. These configurations are static and can only be altered through Radio Resource Control (RRC) reconfigurations. Furthermore, UL Tx switching is limited to these two UL bands for 2Tx UEs. This static approach does not leverage the dynamic nature of wireless network environments, where data traffic, Time Division Duplex (TDD) Downlink / Uplink (DL / UL) configurations, bandwidths, and channel conditions can vary significantly across different bands. As a result, this inflexibility can lead to suboptimal UL performance.
[0004] Recognizing these limitations, studies in 3GPP Release 18 (Rel-18) have focused on enhancing UL Tx switching schemes. These enhancements allow for UL Tx switching across up to three or four bands, with a restriction of up to two simultaneous Tx transmissions for Frequency Range 1 (FR1) UEs. These studies include mechanisms to enable more configured UL bands than what is possible with simultaneous transmission capabilities and to support dynamic Tx carrier switching across the configured bands. This dynamic approach is applicable for both single Transmission and Reception Point Group (TAG) and multiple TAGs configurations, offering a significant improvement over the static configurations of Rel-16.
[0005] Additionally, for Rel-18, UEs are permitted to support only some band pairs for concurrent UL transmission based on their capabilities. This introduces a level of flexibility that allows for more efficient use of the available spectrum and resources, depending on the UE's capabilities and the network conditions.
[0006] The present disclosure aims to provide an enhancement for the existing Tx or Rx switching scheme.SUMMARY
[0007] Accordingly, the present disclosure aims to provide a method for wireless communication, a wireless communication method in Random Access process, a wireless communication device and a storage medium.
[0008] A technical scheme adopted by the present disclosure is to provide a method for wireless communication. The method is executed by a user equipment (UE) . The method includes: reporting a UE capability to support reception (Rx) switching between a plurality of frequency resources to a base station; and receiving an Rx switching configuration from the base station.
[0009] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication. The method is executed by a base station. The method includes: receiving, from a user equipment (UE) , a UE capability to support reception (Rx) switching between a plurality of frequency resources; determining an Rx switching configuration based on the UE capability; and transmitting the Rx switching configuration to the UE.
[0010] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication in Random Access process. The method is executed by a user equipment. The method includes: reporting a UE capability to support transmission (Tx) or reception (Rx) switching between a plurality of frequency resources to a base station; and determining a Tx or Rx switching pattern.
[0011] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication in Random Access process. The method is executed by a base station. The method includes: receiving, from a user equipment (UE) , a UE capability to support transmission (Tx) or reception (Rx) switching between a plurality of frequency resources; and determining a Tx or Rx switching pattern.
[0012] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication. The method is executed by a user equipment (UE) . The method includes: reporting a UE capability to support transmission (Tx) and / or reception (Rx) switching between a plurality of candidate frequency resources within a single group or across a plurality of groups to a base station.
[0013] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication. The method is executed by a base station. The method includes: receiving a UE capability to support transmission (Tx) and / or reception (Rx) switching between a plurality of candidate frequency resources within a single group or across a plurality of groups from a user equipment (UE) .
[0014] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication. The method is executed by a user equipment (UE) . The method includes: determining a reception (Rx) switching pattern; obtaining a first period and a first frequency resource for data reception based on the Rx switching pattern; obtaining a second period and a second frequency resource for performing measurement; and determining whether to perform an additional Rx switching to switch from the first frequency resource to the second frequency resource when the first period overlaps the second period.
[0015] Another technical scheme adopted by the present disclosure is to provide a method for wireless communication. The method is executed by a base station. The method includes: determining a reception (Rx) switching pattern for a UE; obtaining a first period and a first frequency resource for data reception based on the Rx switching pattern; obtaining a second period and a second frequency resource for performing measurement; and determining whether to perform an additional Rx switching to switch from the first frequency resource to the second frequency resource when the first period overlaps the second period.
[0016] Another technical scheme adopted by the present disclosure is to provide a video coding apparatus. The apparatus includes a processor and a memory. The memory is configured to store executable instructions that, when executed by the processor, cause the processor to perform any of the foregoing methods.
[0017] Another technical scheme adopted by the present disclosure is to provide a computer readable medium. The computer readable medium is configured to store executable instructions that, when executed by the processor, cause the processor to perform any of the foregoing methods.BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to clearly explain the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are merely some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings may also be obtained based on these drawings without any creative work.
[0019] FIG. 1 illustrates a scenario where Rx switching occurs between more than one carriers / bands.
[0020] FIG. 2 illustrates a scenario where collision between measurement and data transmission occurs when Rx switching is performed.
[0021] FIG. 3 is a flowchart of a wireless communication method according to an embodiment of the present disclosure.
[0022] FIG. 4 shows an exemplary semi-static Rx switching pattern.
[0023] FIG. 5 is a flowchart of a wireless communication method in Random Access process according to an embodiment of the present disclosure.
[0024] FIG. 6 shows the procedure of 4-step RACH.
[0025] FIG. 7 is a flowchart of a wireless communication method according to another embodiment of the present disclosure.
[0026] FIG. 8 is a flowchart of a wireless communication method according to yet another embodiment of the present disclosure.
[0027] FIG. 9 illustrates a scenario where collision between Pcell measurement and Rx switching occurs.
[0028] FIG. 10 illustrates a scenario where an addition Rx switching is utilized.
[0029] FIG. 11 is a flowchart of a wireless communication method according to yet another embodiment of the present disclosure.
[0030] FIG. 12 is a schematic diagram of a wireless communication device according to an embodiment of the present disclosure.DETAILED DESCRIPTION
[0031] The disclosure will now be described in detail with reference to the accompanying drawings and examples. Apparently, the described embodiments are only a part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0032] Throughout the history of carrier aggregation, encompassing both LTE and NR specifications, operator interest in aggregating low-band spectrum has been consistently high. Given the practical limitations of current handset RF front-end architectures, operators have requested that 3GPP consider specifying a solution based on a switching scheme. A group of operators has outlined the following problem statement:
[0033] 1) They possess a substantial amount of mid-band spectrum (approximately 300 MHz) , effective for coverage closer to sites, but have limited low-band spectrum (15 MHz) that propagates farther.
[0034] 2) As customers move between urban and rural areas, they spend more time in low-band coverage.
[0035] 3) The low-band spectrum carries significant traffic volumes in both urban and rural settings.
[0036] 4) On average, customers spend 15%of their day in urban low-bands and 50%in rural low-bands.
[0037] 5) The capacity challenge of low-band spectrum significantly impacts customer experience, resulting in poor data speeds due to congestion.
[0038] 6) While Low-Low band Carrier Aggregation (CA) could address these issues, OEMs face challenges in supporting it, and the necessary ecosystem is currently lacking.
[0039] 7) Band 29 (B29) is widely deployed in the network but remains underutilized.
[0040] The most straightforward way to address the problem of low-band spectrum is to aggregate more than one low-band carrier using the current Carrier Aggregation (CA) mechanism. However, this approach has several challenges.
[0041] From a technical perspective:
[0042] 1) Frequency Band Characteristics: Low bands like 700 MHz and 900 MHz typically have narrow bandwidths (e.g., 5 MHz or 10 MHz) . CA is designed to increase total bandwidth by combining multiple carriers, but the limited bandwidth of low bands results in minimal performance gains. Additionally, the frequency gap between low bands is significant, complicating the design of radio frequency (RF) components and increasing the difficulty of implementing CA.
[0043] 2) RF Design Complexity: Supporting low-low band CA requires the RF front-end in devices to handle multiple low-band signals simultaneously. This demands advanced RF filters, power amplifiers, and antenna designs. Accommodating larger antennas for longer wavelength low-band signals is challenging in compact devices like smartphones.
[0044] 3) Inter-modulation Interference: Low-low band CA is prone to inter-modulation interference, which can degrade signal quality and overall communication performance.
[0045] From an industrial perspective:
[0046] 1) Lack of Chipset Support: Chipset manufacturers focus on supporting CA for mid-and high-frequency bands due to higher market demand. The limited demand for low-low band CA makes it less attractive for investment in R D. Additionally, supporting low-low band CA requires more complex RF chip designs, which increases costs.
[0047] 2) Limited Support from Device Manufacturers: Device manufacturers prioritize features that significantly enhance user experience, such as higher speeds and lower latency, which are more easily achieved through mid-and high-band CA. The benefits of low-low band CA are marginal, reducing OEMs'motivation to support it.
[0048] From a market and ecosystem perspective:
[0049] 1) Limited Demand from Operators: Low bands are primarily used for wide-area and deep indoor coverage, rather than for capacity enhancement. Since CA is aimed at increasing capacity, operators have little incentive to push for low-low band CA. Also, the allocation of 700 MHz and 900 MHz spectrum varies significantly across countries and regions, making it difficult to establish a global ecosystem for low-low band CA.
[0050] 2) Minimal User Experience Improvement: Due to the narrow bandwidth of low bands, the performance improvement from low-low band CA is minimal, offering little enhancement to user experience. Compared to the significant speed improvements achieved with mid-and high-band CA, low-low band CA offers limited market appeal, making it less likely to drive ecosystem development.
[0051] In Release 16, there are some limitations regarding multi-carrier uplink (UL) operation. Specifically, a 2TX User Equipment (UE) can be configured with a maximum of two UL bands, which can only be altered through Radio Resource Control (RRC) reconfiguration. Moreover, UL transmission (Tx) switching is restricted to these two UL bands for 2Tx UEs. Dynamically selecting carriers for UL Tx switching, based on factors such as data traffic, Time Division Duplex (TDD) downlink / uplink (DL / UL) configuration, bandwidths, and channel conditions of each band, instead of relying on RRC-based cell (s) reconfiguration, could potentially enhance UL data rates, spectrum utilization, and UL capacity. Consequently, in Release 18, studies have focused on UL Tx switching schemes across up to three or four bands, with a limitation of up to two simultaneous transmissions for Frequency Range 1 (FR1) UEs. These studies include mechanisms to enable more configured UL bands than the UE's simultaneous transmission capability and to support dynamic Tx carrier switching across the configured bands for configurations involving both single Transmission and Reception Points Group (TAG) and multiple TAGs.
[0052] For Release 18, UL Tx switching for three or four bands with dual UL transmission is supported. The UE is permitted to support only certain band pairs for concurrent UL transmission, based on UE capabilities.
[0053] When two Tx chains are currently associated with band A and band B, and the next transmission requires a single port transmission on band C, if one transmission is indicated via the uplinkTxSwitching-DualUL-TxState, one Tx chain is switched to band C. The associated band for the other Tx chain is determined by a new RRC parameter, which is selected from the following alternatives:
[0054] 1) An associated band is configured for each band so that the other Tx chain is associated with the configured band (as the associated band for the transmitting band) . For example, the associated band for each transmitting band could be configured as {B for A} , {Afor B} , {Afor C} , and {C for D} .
[0055] 2) When a single port transmission on band C is scheduled, and Tx chains are currently associated with bands A and B, the Tx chain associated with band B is switched to band C, while the other Tx chain associated with band A remains unchanged (because band A is the associated band for band C) .
[0056] 3) When a single port transmission on band D is scheduled, and Tx chains are currently associated with bands A and B, the Tx chain associated with band A (or B) is switched to band D, while the other Tx chain associated with band B (or A) is switched to band C (because band C is the associated band for band D) .
[0057] If there is one band where concurrent transmission with any other band is not supported, the network does not configure an associated band for that band. In such a case, even if one transmission is configured, the UE performs switching as though two transmissions are configured when a single port transmission on the band is scheduled.
[0058] For switched UL, if the UE supports up to 2 ports UL transmission on all the bands in the band combination, only switching cases (Tx chain states) with 2T are considered.
[0059] 1) In the case of 3 bands, 3 switching cases ( {2T, 0T, 0T} , {0T, 2T, 0T} , {0T, 0T, 2T} ) are considered.
[0060] 4) In the case of 4 bands, 4 switching cases ( {2T, 0T, 0T, 0T} , {0T, 2T, 0T, 0T} , {0T, 0T, 2T, 0T} , {0T, 0T, 0T, 2T} ) are considered.
[0061] For dual UL, if the UE supports concurrent transmission on all band pairs and supports up to 2 ports UL transmission on all the bands in the band combination, all possible switching cases with 1T-1T and 2T are considered.
[0062] 1) In the case of 3 bands, 6 switching cases ( {2T, 0T, 0T} , {0T, 2T, 0T} , {0T, 0T, 2T} , {1T, 1T, 0T} , {1T, 0T, 1T} , {0T, 1T, 1T} ) are considered.
[0063] 2) In the case of 4 bands, 10 switching cases ( {2T, 0T, 0T, 0T} , {0T, 2T, 0T, 0T} , {0T, 0T, 2T, 0T} , {0T, 0T, 0T, 2T} , {1T, 1T, 0T, 0T} , {1T, 0T, 1T, 0T} , {1T, 0T, 0T, 1T} , {0T, 1T, 1T, 0T} , {0T, 1T, 0T, 1T} , {0T, 0T, 1T, 1T} ) are considered.
[0064] An operator-suggested scenario involves the aggregation of band n5 with band n29. From a duplexer design perspective, the frequency separation between these bands generally does not present a feasibility challenge. However, the significant fractional bandwidth introduces additional implementation challenges for smartphones, particularly in terms of antenna design. If an Original Equipment Manufacturer (OEM) opts to use a single antenna to aggregate these bands, a tuning solution might be necessary to optimize performance. Optimizing for both bands simultaneously can be challenging due to their frequency separation. A potential design solution involves implementing additional antenna elements to support these combinations, which may increase costs and add complexity to the RF architecture. This complexity comes in the form of additional components and increased volume within the device's form factor. Therefore, it is crucial to specify User Equipment (UE) requirements, including a switching gap (if needed) , along with corresponding physical layer procedures to enable switching between the two cases illustrated in FIG. 1.
[0065] Case 1: Transmission and reception (Tx / Rx) on the Frequency Division Duplexing (FDD) carrier 1, with no reception (Rx) on the Supplemental Downlink (SDL) carrier 2.
[0066] Case 2: Reception (Rx) on the SDL carrier 2, with no transmission and reception (Tx / Rx) on the FDD carrier 1.
[0067] When enabling Rx switching between more than one cases, certain issues as explained below may arise.
[0068] Issue 1: How can we support flexible band usage for a UE between more than one carriers / bands when the UE has a limited number of Rx?
[0069] Issue 2: How can we enable Rx switching under idle / inactive states, especially for the random access procedure?
[0070] Given that the number of Rx in a UE is limited (e.g., 1 Rx or 2Rx) , and the number of usable carriers / bands are larger than the number of Rx for a UE, issues may arise if the UE remains fixed on a carrier / band for data reception and transmission. For instance, when the current served carrier / band has high traffic load, this may decrease the reliability or capacity of the data reception and transmission. Therefore, it is necessary to study how to enable flexible usage of multiple carriers / bands for a UE with a limited number of Rx. This includes how to perform Rx switching between two or more carriers / bands, and the detailed indication signaling design that will be needed. Additionally, the UE's capability to support Rx switching across multiple carriers / bands may also need to be reported. This could include parameters such as the Rx switching periodicity, the specific switching points within a periodicity, and other relevant details.
[0071] Issue 3: How can we flexibly utilize the bands / carriers in a multi-carrier (s) / band (s) cell scenario when the number of Tx / Rx is limited?
[0072] Flexible spectrum utilization is not just a technical requirement, but a fundamental enabler for the success of 6G networks. This flexibility ensures that the network can adapt to evolving demands, leverage new frequency bands, and coexist with other systems, all while maintaining high performance, reliability, and sustainability. Detailed analysis is shown below:
[0073] 1) Spectrum Scarcity and Efficiency: The radio frequency spectrum is a finite resource. With the exponential growth in connected devices and data traffic, spectrum scarcity is becoming a significant challenge. 6G networks must adopt flexible spectrum usage techniques to maximize spectral efficiency. This will enable dynamic allocation and sharing of spectrum resources based on real-time demand.
[0074] 2) Diverse Use Cases: 6G is expected to support a wide range of use cases, including ultra-reliable low-latency communication (URLLC) , massive machine-type communication (mMTC) , and enhanced mobile broadband (eMBB) . Each of these use cases has varying spectrum requirements in terms of bandwidth, latency, and reliability. Flexible spectrum utilization will allow the network to dynamically adapt to these diverse needs.
[0075] 3) Integration of Sub-THz and THz Bands: 6G will likely extend into sub-terahertz (sub-THz) and terahertz (THz) frequency bands to meet the demand for ultra-high data rates and capacity. These bands have unique propagation characteristics, such as high attenuation and limited coverage. Flexible spectrum management will be essential to optimize the use of these bands in conjunction with lower-frequency bands.
[0076] 4) Dynamic and Opportunistic Access: Future networks will need to coexist with legacy systems and other spectrum users, such as satellite communications and radar systems. Dynamic spectrum access (DSA) and opportunistic spectrum sharing will be crucial to minimize interference and ensure harmonious coexistence.
[0077] 5) Energy Efficiency and Sustainability: Efficient spectrum utilization contributes to energy savings by reducing the need for excessive infrastructure deployment and optimizing resource allocation. This aligns with the global push for sustainable and green communication technologies in 6G.
[0078] 6) Regulatory and Policy Considerations: Flexible spectrum usage will require advancements in regulatory frameworks to enable dynamic licensing, spectrum sharing, and unlicensed spectrum access. Standards bodies and policymakers must collaborate to establish guidelines that support innovation while ensuring fair and efficient spectrum use.
[0079] Therefore, aggregating multiple carriers or bands, or utilizing multi-carrier / multi-band cells, could be potential solutions for 5G and 6G networks. Given that the spectrum below 6GHz has already been heavily utilized and is nearing exhaustion due to the growing demand for wireless communication services, exploring such approaches becomes increasingly critical. As we move towards 6G, future communication systems will need to explore and utilize spectrum beyond 6 Ghz, such as FR2 (24Ghz to 52Ghz) and FR3 (e.g., 7~24Ghz) . While these higher frequency bands provide immense potential, they also come with challenges, such as limited coverage and higher propagation losses. Due to the limited Tx / Rx at the UE side (we assume the number of Tx / Rx is limited, based mainly on the structure of current smartphones) , not all of the aggregation bands / carriers have their own Tx / Rx. Thus, Tx / Rx switching between the bands / carriers will be needed. In addition, the frequency range available for 6G is so wide that it is necessary to report whether the UE can support such a large bandwidth range of frequency bands and whether it has the capability to perform flexible switching within these ranges. If supported, the required time duration for the Tx / Rx switching is also needed.
[0080] Issue 4: When Rx switching between more than one carriers / bands is enabled, the impact on the measurement for a UE need to be studied.
[0081] In current specification, within the information element RRCReconfiguration-IEs, a parameter measConfig can be included. The detailed configuration of measConfig is shown in Table 1. Table 1 measConfig information element
[0082] The measConfig includes multiple parameters such as meansObject, reportConfig, measId, measGapConfig, etc. A measurement ID (MeasID) is a combination of measObject and reportConfig, and meansObject include NR cell and LTE cell.
[0083] The UE needs to perform measurements (L3 / L1) during a measurement time duration, e.g., inter-band / frequency or intra-band / frequency / inter-RAT measurement. This is used for cell selection / re-selection or handover, etc. When Rx switching between more than one carrier / band is enabled, due to the limited number of Rx, the UE is unable to perform measurements on one carrier / band while switching to another carrier (s) / band (s) . As shown in FIG. 2, for example, consider two carriers / bands configured for the UE, denoted as carrier 1 / band 1 (assumed as Pcell) , and carrier 2 / band 2 (assumed as Scell) . When a UE performs Rx switching at an Rx switching point, from carrier 1 / band 1 to carrier 1 / band 2, then during the duration T2, the UE is unable to perform the measurement on carrier 1 / band 1 within the duration T2. However, this will impact the system capacity as the UE cannot perform the measurement in a timely manner. Thus, how to handle this issue needs to be studied.
[0084] The present disclosure proposes several communication mechanism, especially for the Tx or Rx switching between more than one bands / carriers, so as to solve at least some of the above-described issues.
[0085] FIG. 3 is a flowchart of a wireless communication method according to an embodiment of the present disclosure. As shown in FIG. 3, the method includes operations described in blocks S101 to S103. In some embodiments, the method may further include operations described in blocks S104 and S105.
[0086] In S101, the UE reports a UE capability to support reception (Rx) switching between multiple frequency resources, and the base station (BS) receives the UE capability.
[0087] The frequency resources may include, for example, but are not limited to, frequency bands, carriers, or other types of frequency resources.
[0088] In one embodiment, the UE capability may include at least one selected from: a set of available frequency resources that are used for the Rx switching; indexes of the set of available frequency resources; one or more available Rx switching points within an available Rx switching periodicity; capability of supporting dynamic indication of the Rx switching; or an available Rx switching duration.
[0089] The available Rx switching points indicates at which time point or time points the UE can perform Rx switching. The Rx switching periodicity may represent the regular interval or pattern of time in which the UE is capable of switching between several frequency resources (for one time or for multiple times) . The available Rx switching duration indicates the switching time needed for switching from one frequency resource to another.
[0090] In one embodiment, the UE capability may further include: a relationship between different frequency resources and a plurality of Rx chains / ports, configured to indicate frequency resources among which each of the Rx chains / ports is capable of switching. With this information, the base station may know the available frequency resources for each Rx chain / port of the UE.
[0091] In one embodiment, the UE is pre-configured with a mapping table indicating a plurality sets of available Rx switching durations and / or available Rx switching point types. The UE capability may include an index corresponding to one of the plurality sets of available Rx switching durations and / or available Rx switching point types. In this case, both the UE and the base station may be pre-configured with the mapping table, and for reporting its Rx switching capability, the UE may simply transmits an index indicating one set of available Rx switching duration and / or available Rx switching point type, rather than sending the complete capability information.
[0092] The above-explained reporting contents can be separately used or combined with each other. The followings are several examples.
[0093] For example, the UE reports its capability to support Rx switching across multiple bands / carriers / frequency resources. This capability can be communicated via RRC (Radio Resource Control) , MAC-CE (Medium Access Control -Control Element) , or UCI (Uplink Control Information) . The report may include at least one of the following parameters:
[0094] 1) Combination of bands / carriers / frequency resources used for Rx switching;
[0095] 2) Index of combination bands / carriers / frequency resources;
[0096] 3) One or more Rx switching points within a Rx switching periodicity;
[0097] 4) Support for dynamic Rx switching as indicated by the base station;
[0098] 5) TxSwitchingTimeDuration, which specifies the time required to switch from one band / carrier / frequency resource to another;
[0099] 6) The relationship between the bands / carriers / frequency resources and Rx, indicating which bands / carriers / frequency resources an Rx can switch between;
[0100] 7) Capability of enabling additional Rx switching between multiple bands / carriers / frequency resources within an Rx switching period. This parameter indicates that whether additional Rx switching points can be executed by the UE within a period when a semi-static Rx switching pattern is configured.
[0101] As another example, the UE reports its capability to support Rx switching across multiple bands / carriers / frequency resources. This capability can be communicated via RRC (Radio Resource Control) . The report may include at least one of the following parameters:
[0102] 1) Combination of bands / carriers / frequency resources used for Rx switching;
[0103] 2) Index of combination bands / carriers / frequency resources;
[0104] 3) One or more Rx switching points within a Rx switching periodicity;
[0105] 4) The relationship between the bands / carriers / frequency resources and Rx, indicating which bands / carriers / frequency resources a Rx can switch between;
[0106] 5) Capability of enabling additional Rx switching between multiple bands / carriers / frequency resources within an Rx switching period. This indicates that additional Rx switching points can be executed by the UE within a period when a semi-static Rx switching pattern is configured;
[0107] 6) Support for dynamic Rx switching as indicated by the base station;
[0108] 7) The index of the Rx switching / switching time type. A table can be pre-defined and used to indicate the Rx switching duration and / or the Rx switching duration type, as shown in Table 2 or Table 3. Table 2. Options for Rx switching duration / time Table 3. Options for Rx switching duration / time and switching point number (type)
[0109] In the column labeled "One or more Rx switching points, " the value "0" indicates that only one Rx switching point or one pair of Rx switching points is included. The value "1" signifies that more than one Rx switching point or more than one pair of Rx switching points is included.
[0110] In S102, the base station determines an Rx switching configuration.
[0111] Based on the reported UE capability for Rx switching, the base station may determine a proper Rx switching configuration, such that the configuration may meet the UE capability for Rx switching. For example, the configured period for the UE to perform Rx switching may comply with the available period (or periodicity) of the UE for performing Rx switching.
[0112] In S103, the base station transmits the Rx switching configuration, and the UE receives the Rx switching configuration.
[0113] The Rx switching configuration may include a semi-static configuration. Alternatively, the Rx switching configuration may include a semi-static configuration and a dynamic indication. Alternatively, the Rx switching configuration may include a dynamic indication. Detailed explanations are given below.
[0114] Option 1: Semi-static configuration
[0115] The Rx switching configuration may be semi-statically configured. Specifically, the Rx switching configuration may include a semi-static configured Rx switching pattern. For example, the UE may receive the Rx switching configuration via a Radio Resource Control (RRC) signaling.
[0116] In one embodiment, the Rx switching configuration may include at least one parameter selected from: an Rx switching duration for switching from one frequency resource to another frequency resource; an Rx switching periodicity of the Rx switching pattern; a location of Rx switching, configured to indicate a starting point of the Rx switching duration within the Rx switching periodicity, a set locations of Rx switching, configured to indicate a set starting point (s) of the Rx switching duration within the Rx switching periodicity; a set locations of Rx switching and a Rx switching duration, configured to indicate a set starting point (s) of the Rx switching and a Rx switching duration within the Rx switching periodicity.
[0117] In one embodiment, the Rx switching configuration may include: an amount of switching period pairs within the Rx switching periodicity; or an amount of switching points within the Rx switching periodicity.
[0118] In one embodiment, the Rx switching configuration may include: an Rx switching duration for switching from one frequency resource to another frequency resource; an Rx switching periodicity of the Rx switching pattern; a location of Rx switching, configured to indicate a starting point for switching from a first frequency resource to a second frequency resource; and an Rx on-duration time, configured to indicate a duration for staying at the second frequency resource.
[0119] The above parameters may be configured separately, or they can be combined with each other. Several examples are given below.
[0120] For example, an Rx switching pattern may be semi-statically configured to the UE via RRC signaling. This configuration is activated by the configured RRC signaling and may include at least one of the following parameters:
[0121] 1) RxSwitchingtime (also denoted as RxSwitchingDuration) : This parameter indicates the time required to switch from one band / carrier / frequency resource to another.
[0122] 2) RxSwitchingperiodicity: This parameter specifies the periodicity of the Rx switching pattern. The granularity of the periodicity can be measured in milliseconds, slots, sub-frames, seconds, or frames.
[0123] 3) Locationofswitchingtime: This parameter indicates the location of the switching time point (s) within the periodicity.
[0124] 4) NumofSwitchingperiod: This parameter represents the number of switching periods or the number of switching period pairs within a periodicity.
[0125] 5) NumofSwitchingpoint: This parameter indicates the number of switching points or the number of switching point pairs within a periodicity.
[0126] 6) LocationanddurationofSwitchingtime: This parameter indicates the location of the switching time point (s) and the switching duration within an Rx switching periodicity.
[0127] As illustrated in FIG. 4, the base station can configure an Rx switching pattern, which includes parameters such as RxSwitchingtime, RxSwitchingperiodicity, locationofswitchingtime, and numofSwitchingpoint. The granularity of the Rx switching time can be measured in slots, milliseconds, symbols, frames, seconds, or sub-frames.
[0128] For the parameter "Locationofswitchingtime" , a two-stage structure signaling can be used to indicate the location of the switching time duration. The first structure could be a bitmap, used to indicate which slot / subframe within the Rx switching periodicity includes an Rx switching time. The second stage signaling could be used to indicate the starting symbol of the Rx switching time within a slot / subframe. For example, a total of 4 bits could be used to indicate the starting symbol of the Rx switching time within a slot / sub-frame. The value "0000" could be used to indicate the first symbol within a slot / subframe, while "0001" could indicate the second symbol within a slot / sub-frame, and so on. Alternatively or additionally, 3 bits could be used to indicate the last 8 symbols in a slot / sub-frame. Here, "000" could indicate the last symbol within a slot / sub-frame, "001" could indicate the second-to-last symbol in a slot / sub-frame, and so on. In some embodiments, when more than one slot / subframe within a Rx switching periodicity includes an Rx switching time, then the second stage signaling is shared for the more than one slot / frame, which means, the starting symbol of the Rx switching time within a slot / subframe for the more than one slot / frame is the same.
[0129] In some embodiments, for the parameter "Locationofswitchingtime" , a codepoint can be used, the size of which equals the ceiling value of the logarithm base 2 of the total number of symbols within the Rx switching periodicity.
[0130] In some embodiments, an amount of switching period pairs within the Rx switching periodicity may be predetermined; or an amount of switching points within the Rx switching periodicity may be predetermined. For example, the number of switching periods / points within an Rx switching periodicity is fixed and equals 2. The first Rx switching point instructs the UE to perform Rx switching from band / carrier 1 to band / carrier 2, and the second Rx switching point guides the UE to switch back from band / carrier 2 to band / carrier 1.
[0131] In one embodiment, the UE may determine an actual switching point based on a pre-defined reference point within a slot and an available Rx switching duration of the UE. Specifically, for the parameter "Locationofswitchingtime" , it can be used to indicate the location of the switching time. The signaling can be a codepoint, the size of which equals the ceiling value of the logarithm base 2 of the total number of slots / sub-frames within the Rx switching periodicity. This way, a slot / sub-frame within the Rx switching periodicity can be indicated. The actual location within the indicated slot / sub-frame is determined based on the UE's Rx switching time capability. With the last symbol of a slot serving as a reference point, the nearest symbol to the left in the time domain that is greater than the UE Rx switching time value is selected.
[0132] In one embodiment, the location of Rx switching may include a plurality of pairs of switching locations. Each of the plurality of pairs of switching locations is configured to indicate a first location for switching from a first frequency resource to a second frequency resource and a second location for switching from the second frequency resource to the first frequency resource. For example, the size of the "Locationofswitchingtime" is an even number. Within one Rx switching periodicity, pairs are formed sequentially. In each pair, the first position indicates that the Rx switching is from band / carrier 1 to band / carrier 2, and the second position indicates that the Rx switching is from band / carrier 2 to band / carrier 1.
[0133] In one embodiment, the location of Rx switching may include a plurality of switching locations. The plurality of switching locations are configured to indicate a plurality of first locations for switching from a first frequency resource to a second frequency resource and a plurality of second locations for switching from the second frequency resource to the first frequency resource, alternately. For example, the size of the "Locationofswitchingtime" is an even number, numbered from 1 to N. Here, the odd-numbered positions are used to indicate that the Rx switching is from band / carrier 1 to band / carrier 2, and the even-numbered positions are used to indicate that the Rx switching is from band / carrier 2 to band / carrier 1.
[0134] As another example, an Rx switching pattern may be semi-statically configured to the UE via RRC signaling, and also activated by the RRC signaling. Only one pair of Rx switching points can be included within an Rx switching periodicity. The configuration may include at least one of the following parameters:
[0135] 1) RxSwitchingtime: This parameter indicates the switching time from one band / carrier / frequency resources to another band / carrier / frequency resources.
[0136] 2) RxSwitchingperiodicity: This parameter indicates the periodicity of the Rx switching pattern. The granularity of the periodicity can be in milliseconds, slots, sub-frames, seconds, or frames.
[0137] 3) Locationofswitchingtime: This parameter indicates the location of the switching time within the periodicity.
[0138] 4) LocationanddurationofSwitchingtime: This parameter indicates the location of the switching time point (s) and the switching duration within a Rx switching periodicity.
[0139] 5) RxOndurationTimer: This parameter indicates the duration time of the switched-to carrier / band / frequency resources. In other words, it indicates the duration within which the UE is expected to stay at the switched-to carrier / band / frequency resources.
[0140] The number of switching periods / points within an Rx switching periodicity may be a fixed value, e.g., equal to 2 (the first and second Rx switching points) . The first Rx switching point starts from the "Locationofswitchingtime" and is used to instruct the UE to perform Rx switching from band / carrier 1 to band / carrier 2. The UE stays on band / carrier 2 for a duration time equal to the RxOndurationTimer. The second Rx switching point starts from the first symbol after the RxOndurationTimer and is used to instruct the UE to perform Rx switching from band / carrier 2 back to band / carrier 1.
[0141] Option 2: dynamic indication (semi-static configuration plus dynamic adjustment)
[0142] The Rx switching operation at the UE can be semi-statically configured and dynamically adjusted. For example, the Rx switching configuration may include a set of candidate Rx switching patterns. The UE may receive a dynamic indication from the base station, and select a target Rx switching pattern from the candidate Rx switching patterns for performing Rx switching.
[0143] In one embodiment, the dynamic indication is transmitted via a MAC Control Element (MAC-CE) . The target Rx switching pattern is activated from a last symbol of the MAC-CE plus a time offset, and the time offset may be pre-defined or indicated by the MAC-CE.
[0144] The base station configures a set of Rx switching patterns. A pattern from this set can be indicated via a MAC-CE. The Rx switching pattern will be activated from the position of the last symbol of the MAC-CE plus a predefined time offset. This time offset can also be indicated by the MAC-CE.
[0145] In one embodiment, the dynamic indication is transmitted via a Downlink Control Information (DCI) . The target Rx switching pattern is activated from a last symbol of the DCI plus a time offset, and the time offset may be pre-defined.
[0146] The base station configures a set of Rx switching patterns. A pattern from this set can be indicated via DCI. A field within the DCI can be used to indicate a pattern. The indicated Rx switching pattern will be activated from the position of the last symbol of the DCI plus a predefined time offset. In some cases, the time offset can be equal to 0. In some embodiments, a column can be added to the TDRA table to indicate an Rx switching pattern within the set of Rx switching patterns.
[0147] In one embodiment, the dynamic indication is transmitted by a Cell Radio Network Temporary Identifier (C-RNTI) .
[0148] The base station configures a set of Rx switching patterns. A pattern from this set can be indicated via the C-RNTI. Different C-RNTIs can be used to indicate different Rx switching patterns. For instance, if the base station configures 4 Rx switching patterns, then 4 C-RNTIs can be used. C-RNTI 1 can be used to indicate Rx switching pattern 1, C-RNTI 2 can be used to indicate Rx switching pattern 2, and so on.
[0149] In one embodiment, the dynamic indication is transmitted by a sequence-based signaling. A cycle shift value of the sequence-based signaling is configured to indicate the target Rx switching pattern.
[0150] A sequence-based signaling can be used to indicate an Rx switching pattern within the set of Rx switching patterns. Different cycle shift values of the sequence can be used to indicate different Rx switching patterns. For instance, a sequence with a cycle shift value of 1 can be used to indicate Rx switching pattern 1, a sequence with a cycle shift value of 2 can indicate Rx switching pattern 2, and so on.
[0151] Furthermore, when the UE is capable of supporting the additional Rx switching, the base station may send an indication to trigger the additional Rx switching. The additional Rx switching refers to a switching operation which does not comply with the semi-statically configured Rx switching pattern (s) for the UE. For example, the UE may receive a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback indication which indicates the HARQ-ACK feedback is to be performed on a first frequency resource. When a starting point of the HARQ-ACK feedback locates within a period where an Rx of the UE is working on a second frequency resource, an additional Rx switching may be triggered.
[0152] In this case, an additional Rx switching can be indicated based on the PDSCH HARQ-ACK feedback timing. If the starting point of the PUCCH for HARQ-ACK feedback falls within the current Rx switching on-duration time (meaning the duration the UE is required to stay on the current carrier / band) , then an additional Rx switching from the current carrier / band to another is required. The starting point (symbol) of this additional Rx switching should satisfy the condition of being the nearest symbol before the first symbol of the HARQ-ACK PUCCH. Furthermore, the time interval between this starting point and the HARQ-ACK PUCCH must be greater than the Rx switching time, where the Rx switching time is a value that depends on the UE's capability.
[0153] Option 3: Dynamic indication (some parameters are indicated by the dynamic signaling)
[0154] The base station may send a dynamic indication to the UE to: 1) activate the Rx switching; 2) select Rx switching pattern or parameters; and / or 3) directly configure some or all of Rx switching parameters.
[0155] In this section, the solution of using a dynamic indication for indicating one or more parameters of Rx switching is introduced. Specifically, the UE may receive a dynamic indication configured to indicate one or more parameters of a target Rx switching pattern.
[0156] The dynamic indication may be transmitted via a MAC Control Element (MAC-CE) or a Downlink Control Information (DCI) . The one or more parameters of the target Rx switching pattern may include at least one selected from: a target Rx switching duration; a target location of Rx switching; or a target Rx on-duration time.
[0157] For example, a MAC-CE can be used to indicate an Rx switching pattern. The actual parameters can include at least one of the following:
[0158] 1) RxSwitchingduration: This parameter indicates the switching time from one band / carrier / frequency resources to another.
[0159] 2) Locationofswitchingperiod: This parameter indicates the location of the switching time within the periodicity.
[0160] 3) The time duration: This parameter indicates the duration on the switched-to carrier / band.
[0161] 4) LocationanddurationofSwitchingtime: This parameter indicates the location of the switching time point and the switching duration.
[0162] As another example, a UE specific DCI or UE group common DCI can be used to indicate an Rx switching pattern. The actual parameters can include at least one of the following:
[0163] 1) RxSwitchingduration: This parameter indicates the switching time from one band / carrier / frequency resources to another.
[0164] 2) Locationofswitchingperiod: This parameter indicates the location of the switching time within the periodicity.
[0165] 3) The time duration: This parameter indicates the duration on the switched-to carrier / band. When this time is up, the UE needs to switch back to the original carrier.
[0166] 4) LocationanddurationofSwitchingtime: This parameter indicates the location of the switching time point (s) and the switching duration.
[0167] The proposed Rx switching method may enhance network performance and user experience by enabling the User Equipment (UE) and base station to utilize multiple bands / carriers / frequency resources for Rx, especially in scenarios with limited low-band spectrum. The scheme, which includes a semi-static Rx switching pattern configured based on UE's capabilities and / or base station indications, allows for efficient spectrum management, balancing varying availability and user density across regions. This approach may provide manufacturers with design flexibility to adapt devices to different bands, potentially simplifying antenna design and tuning solutions, leading to cost-effective and efficient devices.
[0168] In some embodiments, the method shown in FIG. 3 may further include operations described in blocks S104 and S105.
[0169] In S104, the UE transmits an Rx switching request, and the base station receives the Rx switching request.
[0170] In S105, the base station transmits a response to the Rx switching request, and the UE receives the response.
[0171] The UE may actively request to perform the Rx switching.
[0172] In some embodiments, the UE may further performs: determining a time window for receiving a response corresponding to the Rx switching request. The time window may start from a first symbol after a last symbol of the Rx switching request.
[0173] In the process where the User Equipment (UE) sends request information (such as a PUCCH, the MAC-CE of BSR, or a MAC-CE) to the base station for Rx switching, the UE transmits a request and expects to receive an indication for Rx switching from the base station within a time window. This time window starts from the end symbol of the T / F resources used for the request information.
[0174] In some embodiments, the Rx switching configuration as explained in previous operations may include configuration for multiple Rx switching patterns. After transmitting the Rx switching request, the UE may receive an Rx switching indication, which is configured is to indicate a selected pattern from the plurality of Rx switching patterns for the UE.
[0175] When the base station configures a set of Rx switching patterns and the UE sends an Rx switching request signal to the base station, the base station, upon correctly receiving the information, transmits an indication for an Rx switching pattern to the UE. This indication is expected to be located within the time window, which starts from the first symbol after the last symbol of the Rx switching request signal. The size of the time window can be pre-defined or indicated by the UE itself.
[0176] In some embodiments, the Rx switching configuration as explained in previous operations may include configuration for multiple Rx switching patterns. The Rx switching request may include a request for a target switching pattern which is selected from the multiple Rx switching patterns. Then, the UE may receive an Rx switching confirmation, which is configured to confirm the request for the target switching pattern.
[0177] The base station configures a set of Rx switching patterns, and the UE can send a request to choose one of the patterns configured by the base station. Within an expected time window, the base station is expected to send a confirmation to the UE. This confirmation can be a DCI, a sequence-based signal, or MAC-CE. The UE can then perform the Rx switching. The starting point for Rx switching can be defined as the first symbol immediately following the last symbol of the confirmation information or following the last symbol of the confirmation information plus an offset value. The offset value can be pre-defined or configured by the base station.
[0178] If the UE receives a confirmation or a signal for Rx switching indication from the base station within the expected time window, the UE can perform Rx switching based on the target switching pattern.
[0179] If the UE does not receive a confirmation or a signal for Rx switching indication from the base station within the expected time window, the UE can re-transmit the request information to the base station and expect to receive a confirmation during the time window corresponding to the re-transmitted request, which starts from the last symbol of the UE requested information. Alternatively, if the UE does not receive a confirmation or a signal for Rx switching indication from the base station within the expected time window, the UE can still perform Rx switching starting from the first symbol immediately following the expected time window.
[0180] The above solution involves the UE reporting its Rx switching capabilities, the base station configuring a semi-static pattern based on these capabilities, the UE requesting Rx switching, and performing the switch with or without base station feedback. In this way, even under scenarios with Rx limitations, both the User Equipment (UE) and the base station can utilize more than one band, carrier, or frequency resource, thereby enhancing the system's capacity.
[0181] The present disclosure further provides a wireless communication method for Tx / Rx switching in the random access stage. FIG. 5 is a flowchart of a wireless communication method in Random Access process according to an embodiment of the present disclosure. As shown in FIG. 5, the method includes operations described in blocks S201 to S 203.
[0182] In S201, the UE reports a UE capability to support transmit (Tx) and / or reception (Rx) switching between multiple frequency resources, and the base station (BS) receives the UE capability.
[0183] In S202, the UE determines a Tx / Rx switching pattern.
[0184] In S203, the base station determines a Tx / Rx switching pattern.
[0185] This method serves to determining Tx, Rx, or Tx and Rx switching pattern or patterns during different stages during the random access procedure. The method can be applied for both the 4-step RACH and the 2-step RACH process. For simplicity, the 4-step RACH will be taken as example to illustrate the operations of the method.
[0186] FIG. 6 shows the procedure of 4-step RACH. A set of time windows for the RACH access procedure are defined. When a UE transmits a RACH preamble to a gNB, a Ra-ResponseWindow starts. During this RAR window, the UE needs to monitor for a Random Access Response (RAR) . After correctly detecting the RAR, the UE then transmits Msg3 based on the grant within the RAR. Following the transmission of Msg3, the UE is required to receive Msg4 within a ra-contentionResolutionTimer. Upon correctly receiving Msg4, the UE transmits a corresponding Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) for Msg4. The ranges for the Ra-ResponseWindow and ra-contentionResolutionTimer are {sl1, sl2, sl4, sl8, sl10, sl20, sl40, sl80} and {sf8, sf16, sf24, sf32, sf40, sf48, sf56, sf64} respectively, as defined in TS 38.331. With the increasing number of UEs, using only one anchor band for the UE access procedure can cause access blockage. Utilizing more than one band / carrier / frequency resource for initial access is a straightforward way to address this issue. Under this scenario, how to support Rx switching between these multiple bands / carriers / frequency resources requires further study.
[0187] The UE may report its capability to support Rx switching between multiple bands / carriers / frequency resources during initial access procedure. Different methods can be applied as explained below.
[0188] In one embodiment, the UE is preconfigured with multiple Random Access Channel (RACH) sequences, which are associated with the UE capability to support the Rx switching. The operation of reporting the UE capability to support the Rx switching may include: transmitting a specific RACH sequence selected from the multiple RACH sequences to the base station. For example, a first RACH sequence may indicate that the UE is capable of supporting Rx switching, while a second RACH sequence may indicate that the UE is not capable of supporting Rx switching. The UE may select the first RACH sequence to inform the base station that it has the Rx switching capability, or the UE may select the second RACH sequence to inform the base station that is does not has the Rx switching capability.
[0189] The capability can be implicitly conveyed using a separate PRACH sequence set. For instance, the total candidate RACH sequences within a cell / serving cell / bands / carriers can be divided into multiple groups, with each group of RACH sequences associated with a specific capability. If a UE supports a certain capability, it needs to generate / choose a sequence within the corresponding RACH sequence group and transmit this to the base station over one or more RO (s) . When the base station receives a RACH sequence from a particular group, it can then determine the UE's capability.
[0190] In one embodiment, the UE is preconfigured with multiple Random Access Channel Occasions (ROs) , which are associated with the UE capability to support the Rx and / or TX switching. The operation of reporting the UE capability to support the Rx and / or TX switching may include: transmitting a RACH sequence over a specific RO selected from the plurality of ROs to the base station. For example, a first RACH RO may indicate that the UE is capable of supporting Rx and / or TX switching, while a second RACH RO may indicate that the UE is not capable of supporting Rx and / or TX switching. The UE may select the first RACH RO to inform the base station that it has the Rx and / or TX switching capability, or the UE may select the second RACH RO to inform the base station that is does not has the Rx and / or TX switching capability.
[0191] A separate RACH ROs set can be used to implicitly carry the capability. For example, the total candidate ROs within a cell / serving cell can be divided into two or more groups, with each group of RACH ROs associated with a specific capability. If a UE supports a certain capability, it needs to generate / choose a sequence and transmit the RACH sequence (s) over one or more RO (s) within the corresponding RO group. When the base station receives a RACH sequence over one or more ROs from a particular group, it can then determine the UE's capability.
[0192] In one embodiment, the UE is preconfigured with multiple Random Access Channel (RACH) formats, which are associated with the UE capability to support the Rx and / or TX switching. The operation of reporting the UE capability to support the Rx and / or TX switching may include: selecting a specific RACH format from the plurality of RACH formats for message 1 (Msg1) transmission. For example, a first RACH format may indicate that the UE is capable of supporting Rx and / or TX switching, while a second RACH format may indicate that the UE is not capable of supporting Rx and / or TX switching. The UE may select the first RACH format to inform the base station that it has the Rx and / or TX switching capability, or the UE may select the second RACH format to inform the base station that is does not has the Rx and / or TX switching capability.
[0193] Separate RACH formats can be used to implicitly carry the capability. More than one RACH formats can be configured for a UE, and each one or more RACH formats can be associated with a specific capability. For instance, if the base station configures two RACH formats for a UE, denoted as RACH format 1 and RACH format 2, and RACH format 1 is associated with a certain capability, the UE needs to use RACH format 1 for Msg1 transmission if it supports this capability. Otherwise, RACH format 2 can be used.
[0194] In one embodiment, the UE is preconfigured with multiple time or frequency (T / F) resource allocations for Random Access Channel Occasions (ROs) , which are associated with the UE capability to support the Rx and / or TX switching. The operation of reporting the UE capability to support the Rx and / or TX switching may include: transmitting a RACH sequence based on a specific T / F resource allocation selected from the multiple of T / F resource allocations. For example, a first TF resource allocation may indicate that the UE is capable of supporting Rx and / or TX switching, while a second TF resource allocation may indicate that the UE is not capable of supporting Rx and / or TX switching. The UE may select the first TF resource allocation to inform the base station that it has the Rx and / or TX switching capability, or the UE may select the second TF resource allocation to inform the base station that is does not has the Rx and / or TX switching capability.
[0195] Different T / F resources of RO (s) can be used to convey the capability. A set of ROs associated with a SSB / SS set / PBCH can be divided into several groups, and the position of the RO's T / F resources can be used to carry the capability.
[0196] In subsequent sections, Tx / Rx switching determination methods for different stages of the random access procedure will be explained.
[0197] (1) For Msg2 reception
[0198] During the random access procedure, the reception of Msg2 is time-restricted. Therefore, when Rx switching between more than one band / carrier / frequency resources is enabled, the current timeline during the random access procedure becomes unsuitable. A modified definition of the timeline during the random access procedure will be necessary. Additionally, the corresponding signaling indication will also be required.
[0199] The Tx or Rx switching pattern as described in operation S201 may include: an Tx / Rx switching pattern for message 2 (Msg2) reception.
[0200] When Rx switching or Tx switching for a UE within the random access procedure is enabled, the timeline between Msg1 (RACH sequence (s) transmission over one or more RO (s) ) and Msg2 (random access response) needs to be defined. In response to a PRACH transmission, the UE attempts to detect a Downlink Control Information (DCI) with a Cyclic Redundancy Check (CRC) scrambled by a corresponding Random Access-Radio Network Temporary Identifier (RA-RNTI) within a Random Access Response (RAR) window. The RAR window starts at the first symbol of an earliest CORESET where the UE is configured to receive Physical Downlink Control Channel (PDCCH) for Type1-PDCCH Common Search Space (CSS) set (as defined in TS 38.213) , which is at least one symbol after a last symbol of a Tx or Rx switching periodicity indicated by the Rx switching pattern. The last / first symbol of the Rx / Tx switching time need to be located after the last PRACH occasion corresponding to the PRACH transmissions. Alternatively or additionally, when a UE time adjustment parameter or a common time adjustment parameter is non-zero (as defined in [4, TS 38.211] ) , the RAR window starts after an additional TTA+kmac millisecond, wherein TTA is a predefined time advance value in [4, TS 38.211] and kmac is determined based on a parameter kmac (kmac is provided by kmac or kmac=0 if kmac is not provided) . The length of the window in number of slots, based on the SCS for Type1-PDCCH CSS set, is provided by the parameter ra-ResponseWindow.
[0201] The operation for triggering Rx / Tx switching for Msg2 reception can be achieved based on any of the following methods.
[0202] a) Rx / Tx switching can be initiated based on the RACH sequence. The RACH sequences can be divided into N groups, with each group containing multiple RACH sequences. A RACH sequence from a specific group can indicate a particular Rx / Tx switching pattern. For example, with 2 Rx / Tx switching patterns, RACH sequences in group 1 could indicate that the UE is to perform Rx / Tx switching pattern 1, while those in group 2 could indicate Rx / Tx switching pattern 2. Similarly, for 4 Rx / Tx switching patterns, the RACH sequences can be divided into 4 groups, with each group corresponding to a specific Rx / Tx switching pattern.
[0203] b) Rx / Tx switching can be triggered based on the Time / Frequency (T / F) resources allocation for the Random Access Opportunity (RO) or the starting points of T / F resources allocation for the RO (s) . Different T / F resources or starting points can indicate specific Rx / Tx switching patterns. For instance, with 2 Rx / Tx switching patterns, T / F resource 1 or the starting point of T / F resource 1 for the RO (s) could indicate that the UE is to perform Rx / Tx switching pattern 1, while T / F resource 2 or the starting point of T / F resource 2 could indicate Rx / Tx switching pattern 2. Additionally, in embodiments where multiple PRACH transmissions are enabled, the T / F resources of the first RO can be used to trigger Rx / Tx switching.
[0204] (2) For Msg4 reception
[0205] For the reception of Msg4 during the random access procedure, the timeline may need to be modified when Rx switching / Tx switching between more than one bands / carriers / frequency resources is enabled. This is because the standard timeline during the random access procedure may no longer be suitable. Therefore, a modified definition of the timeline during the random access procedure would be required, along with the corresponding signaling indication.
[0206] The Tx or Rx switching pattern as described in operation S201 may include: an Tx / Rx switching pattern for message 4 (Msg4) reception.
[0207] In response to a PUSCH transmission scheduled by a RAR UL grant when a UE has not been provided a C-RNTI, the UE attempts to detect a DCI with CRC scrambled by a TC-RNTI scheduling a PDSCH that includes a UE contention resolution identity. This part proposes a methodology to define a time relationship between Msg3 and Msg4. The starting point and duration of the ra-contentionResolutionTimer need to consider Tx / Rx switching, and the starting point of the ra-contentionResolutionTimer needs to be based on both the end of Msg3 and the Tx / Rx switching pattern. The ra-ContentionResolutionTimer window starts at the first symbol after the end of the Tx / Rx switching point, and the Tx / Rx switching point is located after the last symbol of the Msg3 transmission (or the end of the Msg3 transmission) .
[0208] The operation for triggering Rx / Tx switching for Msg4 reception can be achieved based on any of the following methods.
[0209] a) The Rx / Tx switching can be initiated based on Msg3. A field within Msg3 can be used to indicate the Rx / Tx switching pattern. For example, with 2 Rx / Tx switching patterns, state "0" of the field could indicate Rx / Tx switching pattern 1, while state "1" of the field could indicate Rx / Tx switching pattern 2. Similarly, for 4 Rx / Tx switching patterns, 2 bits within Msg3 could be used.
[0210] b) The Rx / Tx switching can be triggered based on the T / F resources of Msg3 or the starting points of T / F resources of the Msg3 transmission. Different T / F resources or starting points of the Msg3 PUSCH can indicate specific Rx / Tx switching patterns. For instance, with 2 Rx / Tx switching patterns, T / F resource 1 or the starting point of T / F resource 1 for the Msg3 could indicate that the UE is to perform Rx / Tx switching pattern 1, while T / F resource 2 or the starting point of T / F resource 2 for the Msg3 PUSCH could indicate Rx / Tx switching pattern 2. Additionally, in embodiments where Msg3 PUSCH with repetition is enabled, the T / F resources of the first Msg3 can be used to trigger Rx / Tx switching.
[0211] (3) For Msg3 transmission
[0212] For the transmission of Msg3 PUSCH during the random access procedure, when Tx / Rx switching between multiple bands / carriers / frequency resources is enabled, corresponding signaling indications will be required. Consequently, the methods to indicate the Tx switching and the patterns of Tx switching need to be defined.
[0213] The Tx or Rx switching pattern as described in operation S201 may include: an Tx / Rx switching pattern for message 3 (Msg3) transmission.
[0214] The operation for triggering Rx / Tx switching for Msg3 transmission can be achieved based on any of the following methods.
[0215] a) Rx / Tx switching between multiple carriers / bands / frequency resources can be initiated based on the Random Access Response (RAR) . A specific field within the RAR can be utilized to indicate a Tx switching pattern.
[0216] b) Rx / Tx switching can be triggered based on the Time / Frequency (T / F) resources of the RAR or the starting points of T / F resources of the RAR. Different T / F resources or starting points of the resource blocks (ROs) can indicate specific Rx / Tx switching patterns. For example, with two Rx / Tx switching patterns, T / F resource 1 or the starting points of T / F resource 1 of the RO (s) can indicate that the UE should perform Rx / Tx switching pattern 1, while T / F resource 2 or the starting points of T / F resource 2 of the RO (s) can indicate Rx / Tx switching pattern 2. In scenarios where multiple Physical Random Access Channel (PRACH) transmissions are enabled, the T / F resources of the first RO can be used to trigger Tx / Rx switching.
[0217] c) Rx / Tx switching can also be triggered based on the scheduling Downlink Control Information (DCI) of the RAR. A field within the DCI can be designated to indicate Tx switching.
[0218] d) Rx / Tx switching can be triggered based on the T / F resources of the scheduling DCI for RAR or the starting points of the T / F resources of the scheduling DCI.
[0219] (4) For Msg5 transmission
[0220] For the transmission of Msg5 PUSCH during the random access procedure, when Rx switching between multiple bands / carriers / frequency resources is enabled, corresponding signaling indications will be required.
[0221] The Tx or Rx switching pattern as described in operation S201 may include: an Tx / Rx switching pattern for message 5 (Msg5) transmission.
[0222] The operation for triggering Rx / Tx switching for Msg5 transmission can be achieved based on any of the following methods.
[0223] a) The Rx / Tx switching can be initiated based on Msg4. A specific field within Msg4 can be used to indicate a Tx switching.
[0224] b) The Rx / Tx switching can be triggered based on the Time / Frequency (T / F) resources of Msg4 or the starting points of T / F resources of Msg4. Different T / F resources or starting points of the resource blocks (ROs) can indicate specific Rx / Tx switching patterns. For instance, T / F resource 1 or the starting points of T / F resource 1 of the RO (s) can indicate that the UE should perform Rx / Tx switching pattern 1, while T / F resource 2 or the starting points of T / F resource 2 of the RO (s) can indicate Rx / Tx switching pattern 2. In scenarios where Msg4 Physical Downlink Shared Channel (PDSCH) with repetition is enabled, the T / F resources of the first Msg4’s PDSCH can be used to trigger Tx / Rx switching.
[0225] c) Rx / Tx switching can also be triggered based on the scheduling Downlink Control Information (DCI) of Msg4. A field within the DCI can be designated to indicate Tx switching.
[0226] d) Rx / Tx switching can be triggered or indicated based on the T / F resources of the scheduling DCI for Msg4 PDSCH or the starting points of the T / F resources of the scheduling DCI.
[0227] For any stage during the random access procedure, one of the UE and the base station may transmit a signaling for triggering the Tx / Rx switching based on any of the foregoing methods, while the other of the UE and the base station may receive this signaling. Thus, the Tx / Rx switching may be determined and / or triggered at both the UE and the base station.
[0228] The proposed Rx switching method may enhance network performance and user experience by enabling the User Equipment (UE) and base station to utilize multiple bands / carriers / frequency resources for Tx and / or Rx during the initial access procedure. In this manner, even under scenarios with Rx limitations, both the User Equipment (UE) and the base station can utilize more than one band / carrier / frequency resource. Consequently, this leads to an improvement in the overall system capacity.
[0229] Furthermore, flexible spectrum utilization is not only a technical necessity but also a crucial enabler for the success of 6G networks. It ensures that the network can adapt to evolving demands, leverage new frequency bands, and coexist with other systems, all while maintaining high performance, reliability, and sustainability. Thus, aggregating more than one carrier / band or multiple carriers / bands may be potential ways to support this requirement. However, due to the limited Tx / Rx capabilities at the UE side, not all aggregated bands / carriers can have their corresponding Tx / Rx. Therefore, Tx / Rx switching between the bands / carriers needs to be carefully designed.
[0230] FIG. 7 is a flowchart of a wireless communication method according to another embodiment of the present disclosure. As shown in FIG. 7, the method includes the operation described in block S301. In some embodiments, the method may further include the operation described in block S302.
[0231] In S301, the UE reports a UE capability to support transmit (Tx) and / or reception (Rx) switching between multiple candidate frequency resources within a single group or across multiple groups, and the base station (BS) receives the UE capability.
[0232] The candidate frequency resources can be divided into multiple groups based on a range of their center carrier frequency. Alternatively or additionally, the candidate frequency resources can be divided into multiple groups based on their Sub-Carrier Spacing (SCS) .
[0233] For example, the candidate bands / carriers can be divided into N groups, denoted as bands / carriers group 1, bands / carriers group 2, and so on. In some cases, the bands / carriers can be grouped based on the range of the center carrier frequency. For example, bands / carriers belonging to Frequency Range 1 (FR1) can be grouped together, those belonging to Frequency Range 2 (FR2) can form another group, and similarly, bands / carriers belonging to Frequency Range 3 (FR3) can be categorized into a separate group.
[0234] In certain embodiments, the division of candidate bands / carriers into N groups can be based on the Subcarrier Spacing (SCS) of the band. Bands / carriers with the same SCS can be grouped together.
[0235] Furthermore, in some embodiments, candidate bands / carriers can be divided into N groups based on the SCS of the band, where bands / carriers within a certain SCS range are grouped together. For instance, the SCS range could be divided into 23 groups, denoted as group 1, group 2, group 3, etc. The SCS for group 1 ranges from 15KHz to 30KHz, for group 2 it ranges from 60KHz to 120KHz, and for group 3, it is above 120KHz. Consequently, bands / carriers falling within the same SCS range are allocated to the same group.
[0236] In one embodiment, the UE reports its capability of supporting Tx switching between multiple bands / carriers within a group, and / or its capability of supporting Tx switching between multiple bands / carriers across carrier / band groups. The UE capability to be reported may include at least one parameter selected from:
[0237] 1) Capability of supporting Tx switching within the single group.
[0238] 2) Capability of supporting Tx switching across the multiple groups. In this case, the candidate combinations also need to be reported. For instance, if there are three carrier / band groups denoted as {group 1, group 2, group 3} , then the candidate combinations for cross-group Tx switching could be {group 1, group 2} , {group 1, group 3} , {group 2, group 3} , {group 1, 2, 3} , etc.
[0239] 3) A Tx switching period within the single group.
[0240] 4) A Tx switching period across the multiple groups. One or more values can be reported. When one value is used, it means all candidate cross-group Tx switching combinations have the same switching period. For example, the Tx switching period between group 1 to group 2 and group 1 to group 3 is the same.
[0241] 5) A Tx which corresponds to a frequency resource or a set of frequency resources within one or more of the multiple groups.
[0242] In one embodiment, the UE reports its capability of supporting Rx switching between multiple bands / carriers within a group, and / or its capability of supporting Rx switching between multiple bands / carriers across carrier / band groups. The UE capability to be reported may include at least one parameter selected from:
[0243] 1) Capability of supporting Rx switching within the single group.
[0244] 2) Capability of supporting Rx switching across the multiple groups. In this case, the candidate combinations also need to be reported. For instance, if there are three carrier / band groups denoted as {group 1, group 2, group 3} , then the candidate combinations for cross-group Rx switching could be {group 1, group 2} , {group 1, group 3} , {group 2, group 3} , {group 1, 2, 3} , etc.
[0245] 3) An Rx switching period within the single group.
[0246] 4) An Rx switching period across the multiple groups. One or more values can be reported. When one value is used, it means all candidate cross-group Rx switching combinations have the same switching period. For example, the Rx switching period between group 1 to group 2 and group 1 to group 3 is the same.
[0247] 5) An Rx which corresponds to a frequency resource or a set of frequency resources within one or more of the multiple groups.
[0248] In one embodiment, the UE reports its capability of supporting Tx and Rx switching between multiple bands / carriers within a group, and / or its capability of supporting Tx and Rx switching between multiple bands / carriers across carrier / band groups. The UE capability to be reported may include at least one parameter selected from:
[0249] 1) Capability of supporting Tx and Rx switching within the single group.
[0250] 2) Capability of supporting Tx and Rx switching across the multiple groups. In this case, the candidate combinations also need to be reported. For instance, if there are three carrier / band groups denoted as {group 1, group 2, group 3} , then the candidate combinations for cross-group Tx and Rx switching could be {group 1, group 2} , {group 1, group 3} , {group 2, group 3} , {group 1, 2, 3} , etc.
[0251] 3) A Tx and Rx switching period within the single group.
[0252] 4) A Tx and Rx switching period across the multiple groups. One or more values can be reported. When one value is used, it means all candidate cross-group Tx and Rx switching combinations have the same switching period. For example, if the Tx and Rx switching period from group 1 to group 2 is the same as from group 1 to group 3, a single value is reported.
[0253] 5) A Tx and an Rx which corresponds to a frequency resource or a set of frequency resources within one or more of the multiple groups.
[0254] The UE capability to support transmit (Tx) and / or reception (Rx) switching between multiple candidate frequency resources within a single group or across multiple groups may be utilized by the UE and the base station to determine Tx and / or Rx parameters or trigger Tx and / or Rx switching operation. For example, the method may further include an operation as shown in block S302.
[0255] In S302, the base station transmits Tx and / or Rx switching parameters, and the UE receives the Tx and / or Rx switching parameters.
[0256] After the User Equipment (UE) reports its capabilities, upon correct reception of the UE capability, the base station can configure Tx and / or Rx switching parameters or patterns for the UE through, for example, Radio Resource Control (RRC) messages. Additionally, the base station can send a Downlink Control Information (DCI) or a Medium Access Control Element (MAC-CE) to the UE to indicate a Tx / Rx switching event.
[0257] The present disclosure further provides a set of methodologies to manage collisions between Rx switching and measurements (L1 / L3) for User Equipment (UE) . For example, A priority rule between Rx switching and measurements has been proposed, and trigger conditions for Rx switching have been defined. Additionally, dynamic indications for Rx switching / measurement are proposed. This approach can help avoid ambiguity between the base station and UE behavior, and in some cases, it can improve performance capacity without adding any additional signaling overhead.
[0258] Assuming that the cells configured on carrier 1 and carrier 2 are serving cells, with PCell and SCell within a carrier respectively, the UE should perform L3 / L1 measurements on both carriers using each carrier's reference signals. However, this Carrier Aggregation (CA) operation differs from other conventional CA operations in that the UE cannot operate on both carriers simultaneously. Therefore, the UE cannot measure on both carriers at the same time. The reference signals should be available for the UE to measure on each carrier during each carrier's active time.
[0259] For instance, if the UE has already switched from one band to another (assuming a switch from band 2 to band 1, where band 1 is PCell and band 2 is SCell) , the UE would not receive any signal at the serving cell in band 2. If the UE also needs to perform regular RRM / L1 measurement on these serving cells of the band, based on the current assumption, the UE cannot receive signaling / data on band 1 (PCell) and band 2 (SCell) simultaneously. A similar case applies for UE switching from band 1 to band 2.
[0260] FIG. 8 is a flowchart of a wireless communication method according to yet another embodiment of the present disclosure. The method is executed by a UE. As shown in FIG. 8, the method includes operations described in blocks S401 to S404. It should be understood, the method shown in FIG. 8 can be utilized in combination with any of the Tx / Rx switching determination methods as described in foregoing sections of the present disclosure.
[0261] In S401, an Rx switching pattern is determined.
[0262] The Rx switching pattern may be determined based on any one of the Rx switching pattern determination methods in foregoing sections of the present disclosure.
[0263] In S402, a first period and a first frequency resource for data reception are determined based on the Rx switching pattern.
[0264] In S403, a second period and a second frequency resource for performing measurement are obtained.
[0265] In S404, whether to perform an additional Rx switching is determined.
[0266] When two bands / carriers / frequency resources are configured for the UE, denoted as band / carrier / frequency 1 and band / carrier / frequency 2, in some cases, band / carrier / frequency 1 can be regarded as PCell, and band / carrier / frequency 2 can be regarded as SCell. When a semi-static Rx switching pattern is configured, the Rx switching pattern may include at least one of the following parameters:
[0267] 1) RxSwitchingTime: This parameter indicates the switching time from one band / carrier / frequency resource to another.
[0268] 2) RxSwitchingPeriodicity: This parameter indicates the periodicity of the Rx switching pattern. The granularity of the periodicity can be in milliseconds (ms) , slots, sub-frames, seconds, or frames.
[0269] 3) LocationOfSwitchingTime: This parameter indicates the location of the switching time within the periodicity.
[0270] 4) NumOfSwitchingPeriod: This parameter indicates the number of switching periods or the number of switching period pairs within a periodicity.
[0271] 5) NumOfSwitchingPoint: This parameter indicates the number of switching points or the number of switching point pairs within a periodicity.
[0272] 6) LocationanddurationofSwitchingtime: This parameter indicates the location of the switching time point (s) and the switching duration within a Rx switching periodicity.
[0273] In some cases, the period determined for data reception overlaps with the period determined for performing measurement (L3 / L1 measurements, for example, regular RRM / L1 measurement) , while the frequency resource determined for data reception is different from the frequency resource for performing measurement. If the Rx chain / port of the UE operate on the first frequency resource but measurement on the second frequency resource is preferred, an additional Rx switching which is different from the pre-determined Rx switching pattern may be performed. Thus, whether to perform the additional Rx switching needs to be determined.
[0274] Specifically, the UE may perform Rx switching based on the semi-statically configured Rx switching pattern. When more than one case collides in the time domain (e.g., the UE performs Rx switching from carrier 1 / band 1 / PCell to carrier 2 / band 2 / SCell, and during a time duration T, there is a set of measurements during T) , then the UE and base station can perform measurement or Rx switching based on, for example, a priority rule or a specific indication. As illustrated in FIG. 9, a semi-static Rx switching pattern is configured, and the Rx switching is performed periodically based on the semi-static configuration. When within a time duration (e.g., Rx switching periodicity 1) , the UE is switching to SCell, and the measurement time duration within measurement periodicity 1 is located in Time unit 3 within Rx switching periodicity 1. It should be noticed, the measurement periodicity can be equal to, larger than, or smaller than the Rx switching periodicity.
[0275] In this case, continuous performance of Rx reception on SCell / carrier2 / band2 / frequency resources 2 could result in missing PCell measurements, which then impacts the capacity for mobility, beam management, handover, etc. Therefore, , in addition to semi-statically performing Rx switching, the UE and / or base station may perform an additional Rx switching from SCell / carrier2 / band2 / frequency resources 2 to PCell / carrier1 / band1 / frequency resources 1.
[0276] In one embodiment, a starting point of the additional Rx switching is determined based on a starting point of the second period for performing measurement. In another embodiment, a starting point of the additional Rx switching is determined based on a starting point of an overlapped period between the first period for data reception and the second period for performing measurement.
[0277] Specifically, the starting point of the additional Rx switching can be based either on the starting symbol / slot of the measurement time duration on the PCell, or it can be determined based on the starting point of the collided measurement duration within the PCell. Specifically, it is equal to the nearest symbol located at the starting point, where the time from this symbol to the starting point is larger than or equal to the Rx switching period plus T, as shown in FIG. 10. Here, T is the value between the ending of the additional Rx switching point to the starting of the measurement duration, it can be equal to 0 or large than 0, the value of T can be pre-defined or it can be equal to RTT between UE and base station.
[0278] After the UE completes the measurement, it may perform a second additional Rx switching from carrier2 / band2 / SCell / frequency resource 2 to carrier1 / band1 / PCell / frequency resource 1. The starting point for this second additional Rx switching may be the first symbol following the measurement time duration. Alternatively, when the UE has finished the measurement, it may remain on the cell where the measurement was conducted.
[0279] To solve the collision between the data reception and the measurement operation, a priority rule may be introduced. Thus, whether to perform the additional Rx switching may be determined based on the priority rule.
[0280] In one embodiment, the priority rule includes:
[0281] 1) RRM / L1 measurement on a primary cell (Pcell) having a highest priority;
[0282] 2) RRM / L1 measurement on a secondary cell (Scell) having a second highest priority;
[0283] 3) data reception on the Pcell having a third highest priority; and
[0284] 4) data reception on the Scell having a lowest priority.
[0285] In another embodiment, the priority rule includes:
[0286] 1) dynamic scheduling data on a primary cell (Pcell) having a highest priority;
[0287] 2) dynamic scheduling data on a secondary cell (Scell) having a second highest priority;
[0288] 3) RRM / L1 measurement on the Pcell having a third highest priority;
[0289] 4) RRM / L1 measurement on the Scell having a fourth highest priority;
[0290] 5) other data reception on the Pcell having a fifth highest priority; and
[0291] 6) other data reception on the Scell having a lowest priority.
[0292] In this way, when a collision between two different priority cases occurs in the time domain, and if the UE is currently operating on the lower priority case, then an additional Rx switching from the current carrier / band / frequency resource to another one needs to be performed.
[0293] In another embodiment, whether to perform the additional Rx switching may be determined based on a triggering indication from the base station. The triggering indication may be transmitted via a MAC Control Element (MAC-CE) , a Downlink Control Information (DCI) or a sequence-based signaling.
[0294] For the MAC-CE mechanism, a new MAC-CE design to trigger the additional Rx switching can be considered.
[0295] For the DCI-based mechanism, at least one of the following methods can be used:
[0296] 1) A field within DCI can be used to indicate whether an additional Rx switching needs to be performed. For example, 1 bit can be used, where a state of "0" indicates that the UE does not need to perform the additional Rx switching, and a state of "1" indicates that the UE needs to perform the additional Rx switching.
[0297] 2) A column can be added to the TDRA table (joint coding with the TDRA table) . The new column includes two states, 0 or 1. A state of "0" indicates that the UE does not need to perform the additional Rx switching, and a state of "1" indicates that the UE needs to perform the additional Rx switching.
[0298] 3) A new RNTI can be used to indicate whether an additional Rx switching needs to be performed. The value of the RNTI is configured by the base station. For example, RNTI 1 indicates that the UE does not need to perform the additional Rx switching, and RNTI 2 indicates that the UE needs to perform the additional Rx switching.
[0299] For the sequence-based mechanism, a sequence can be used to indicate whether an additional Rx switching needs to be performed. Different cycle shifts of the sequence can be used for this indication. For example, a sequence with a cycle shift value of 1 indicates that the UE does not need to perform the additional Rx switching, and a sequence with a cycle shift value of 2 indicates that the UE needs to perform the additional Rx switching.
[0300] In some embodiments (for sequence-based methods) , when the UE receives a sequence, it will perform the additional Rx switching. The sequence can be an M sequence, ZC sequence or gold sequence, and the cycle shift value or the initial value of the sequence can be configured by the base station.
[0301] In another embodiment, whether to perform the additional Rx switching may include: determining not to perform the additional Rx switching and staying at the first frequency resource based on the Rx switching pattern.
[0302] According to this scheme, in the event of a collision between Rx switching and measurement, the semi-static Rx switching pattern should always be adhered to, and the measurement on the Scell or Pcell should be skipped. In other words, when the UE performs Rx switching based on the semi-statically configured Rx switching pattern and there is a measurement on another carrier during the current on duration time, the UE should stay on the current carrier and does not need to switch to the other carrier for the measurement.
[0303] In another embodiment, whether to perform the additional Rx switching may include: when the second frequency resource is a Primary cell (Pcell) and the first frequency resource is a Secondary cell (Scell) , determining to perform the additional Rx switching; or when the first frequency resource is the Pcell and the second frequency resource is the Scell, determining to stay on the first frequency resource.
[0304] According to this scheme, in the event of a collision between Rx switching and measurement, the decision to perform an additional Rx switching is based on the following trigger conditions:
[0305] 1) If the measurement is on the Pcell and the Rx reception is on the Scell, an additional Rx switching needs to be performed.
[0306] 2) If the measurement is on the Scell and the Rx reception is on the Pcell, the UE should stay on the Scell for data reception.
[0307] In another embodiment, whether to perform the additional Rx switching may include: when a carrier index of the first frequency resource is larger than a carrier index of the second frequency resource, determining to perform the additional Rx switching; or when the carrier index of the firs frequency resource is less than the carrier index of the second frequency resource, determining to stay on the first frequency resource.
[0308] According to this scheme, in the event of a collision between Rx switching and measurement, the decision to perform an additional Rx switching is based on the carrier index of the measurement and the carrier index of the current carrier. If the carrier index of the measurement is larger than the carrier index of the current carrier, then the UE should stay on the current carrier. If the carrier index of the measurement is smaller than the carrier index of the current carrier, then the UE needs to perform the additional Rx switching.
[0309] In another embodiment, whether to perform the additional Rx switching may be determined based on Sub-Carrier Spacing (SCS) of the first frequency resource and the second frequency resource.
[0310] According to this scheme, in the event of a collision between Rx switching and measurement, the decision to perform an additional Rx switching is based on the SCS of the measurement carrier / band and the SCS of the current carrier / band.
[0311] Specifically, if the SCS of the measurement carrier / band is larger than or equal to the SCS of the current carrier, then the UE should stay on the current carrier. If the SCS of the measurement carrier / band is smaller than the SCS of the current carrier, then the UE needs to perform the additional Rx switching.
[0312] Alternatively, if the SCS of the measurement carrier / band is smaller than or equal to the SCS of the current carrier, then the UE should stay on the current carrier. If the SCS of the measurement carrier / band is larger than the SCS of the current carrier, then the UE needs to perform the additional Rx switching.
[0313] With this method, the measurement capacity for high frequency can be guaranteed, improving the system's capacity.
[0314] FIG. 11 a flowchart of a wireless communication method according to yet another embodiment of the present disclosure. The method is executed by a base station. As shown in FIG. 11, the method includes operations described in blocks S501 to S504.
[0315] In S501, an Rx switching pattern for a UE is determined.
[0316] In S502, a first period and a first frequency resource for data reception are determined based on the Rx switching pattern.
[0317] In S503, a second period and a second frequency resource for performing measurement are obtained.
[0318] In S504, whether to perform an additional Rx switching is determined.
[0319] The method for the base station to determine whether to perform the additional Rx switching is similar to that for the UE, and detailed explanation for each operation will not be repeated herein for simplicity and clarity.
[0320] The present disclosure further introduces a scheme for the SIB1 configuration for extended periodicity of SSB / sync signaling.
[0321] Coverage is one of the key factors that an operator considers when commercializing cellular communication networks due to its direct impact on service quality as well as CAPEX and OPEX. Despite the importance of coverage on the success of NR commercialization, a thorough coverage evaluation and a comparison with legacy RATs considering all NR specification details have not been done until now. For FR1, NR can be deployed either in newly allocated spectrums, such as 3.5GHz or in a spectrum re-farmed from a legacy network, e.g., 3G and 4G. In either case, coverage will be a critical issue considering the fact that these spectrums will most likely handle key mobile services such as voice and low-rate data services. For FR2, coverage was not thoroughly evaluated during the self-evaluation campaign towards IMT-2020 submission and was not considered in Rel-16 enhancements. In these regards, a thorough understanding of NR coverage performance is needed while taking into account the support of the latest NR specification, and thus, in Rel-17 and Rel-18, coverage enhancements for the uplink (UL) channel have been studied.
[0322] Similarly, all satellites for 5G satellite networks (operating in FR1 as well in FR2, and covering both GSO and NGSO constellations) to be deployed in the next 10 years are expected to be designed under the assumptions of optimized power. Due to the large transmission distance, there is a strong need to implement DL coverage enhancement techniques to optimize CAPEX and OPEX for a given targeted coverage, this document mainly focuses on wireless communication between the base station and user device, especially for the case when wireless communication between the base station and user device under Non-Terrestrial Network (NTN) .
[0323] In Rel-18, UL coverage enhancements have been specified as part of NR NTN enhancements, such as repetitions and DMRS bundling. However, during the NR NTN R18 study phase for coverage enhancement, the link-level evaluation identified UL coverage as the bottleneck. However, the evaluation assumptions did not take into account the DL satellite power split among multiple DL satellite beams. The power reduction due to beam splitting is tightly related to the dedicated deployment. A satellite supporting more simultaneous active satellite beams can result in a larger serving area. But on the contrary, it also leads to more reduction of the transmission power over a single beam, naturally yielding more reduced per-beam SNR. Therefore, when the power split is considered, there is a need also for DL coverage enhancement. To confirm the need, a study phase at the RAN1 level, by taking into account the DL satellite power split, to investigate the practical deployment scenarios and DL coverage margin as well as the target DL channel / signal for coverage enhancement. Beam hopping to improve coverage capacity for downlink channels is a suitable way, it is a mechanism for activating / illuminating beams periodically or aperiodically, within a time duration, just a set of beams within all satellite beams can be activated / illuminated, when a satellite beam is activated / illuminated, then UE / gNB can transmit / receives information, for the remaining beams except the set of beams within the all satellite beams, UE / gNB cannot transmit / receives any information. In the current specification, the default periodicity of SSB is 20ms, and based on the current assumption conditions of NTN, it can not to achieve an acceptable coverage ratio, thus, the default periodicity of SSB need to extend. When the default periodicity of SSB / synchronization signaling is extended from 20ms to 160ms / other values, the current mechanism (s) to determine the SS (Search Space) of CORESET 0 is not suitable anymore, power cost will be increased.
[0324] This disclosure proposes a method for detecting a / aset Search Space (SS) of CORESET 0 that aligns with the extended periodicity of SSB / sync signaling, the SS of CORESET 0 needs to match with the configuration of SSB / sync signaling. A time window to determine a or a set of valid / available PDCCH (s) in type 0-PDCCH CSS associated with a SSB is proposed, in this way, the ambiguity for PDCCH between UE and base station can be avoided. Thus, the capacity of system can be improved. The following methods can be considered.
[0325] Method1: A valid / available PDCCH in the Type0-PDCCH CSS association with a SSB / sync signaling or a set of SSB / sync signaling can be defined. Each SSB / sync signaling has an associated time window for determining the valid / available PDCCH within the Type0-PDCCH CSS. If the last symbol of the PDCCH in the Type0-PDCCH CSS associated with the SSB / sync signaling falls within the time window, then the PDCCH in the type0-PDCCH CSS association with the SSB / sync signaling can be regard as valid / available.
[0326] The time window can be defined as starting from the first symbol that locates after the last symbol of the SSB / sync signaling. Alternatively, the time window can also be starting from the first slot / sub-frame / frame following the last symbol of the SSB / sync signaling, or from the first slot / sub-frame / frame locate after a slot containing the SSB / sync signaling. The end of the time window is determined by the following conditions:
[0327] 1) If the current SFN is an odd radio frame, then the time window is ending at the last symbol of next radio frame.
[0328] 2) If the current SFN is an even radio frame, then the time window is ending at the last symbol of the current radio frame.
[0329] In this way, with no additional signaling overhead, the UE power consumption for detection type0-PDCCH can be reduced.
[0330] Method 2: A duration of a time window can be indicated by PBCH payload / MIB, then UE needs to monitor PDCCH in the Type0-PDCCH CSS within the time window, the granularity of the time window duration can be symbol, slot, sub-frame, frame, or ms. The time window can be defined as starting from the first symbol that locates after the last symbol of the SSB / sync signaling. Alternatively, the time window can also be starting from the first slot / sub-frame / frame following the last symbol of the SSB / sync signaling, or from the first slot / sub-frame / frame locate after a slot containing the SSB / sync signaling. A set value of the time window duration can be pre-defined, and it can be indicate by the reserved bits within PBCH / MIB. For instance, 4 value of time window duration can be pre-defined, denote as time duration 1, time duration 2, time duration 3, time duration 4. Then 2 reserved bits within PBCH / MIB can be used to indicate one of the value. “00” can be used to indicate time duration 1, “01” can be used to indicate time duration 2, “10” can be used to indicate time duration 3, “11” can be used to indicate time duration 4.
[0331] In this way, the flexibility to indicate the duration of a time window can be achieved, this is suitable for different traffic requirement scenario (s) .
[0332] Method 3: A duration of time window can be indicated by the DMRS of the PBCH, different DMRS of the PBCH can be used to indicate a time window duration value, the granularity of the time window duration can be symbol, slot, sub-frame, frame, or ms. Then UE needs to monitor PDCCH in the Type0-PDCCH CSS within the time window. The time window can be defined as starting from the first symbol that locates after the last symbol of the SSB / sync signaling. Alternatively, the time window can also be starting from the first slot / sub-frame / frame following the last symbol of the SSB / sync signaling, or from the first slot / sub-frame / frame locate after a slot containing the SSB / sync signaling. A set value of the time window duration can be pre-defined, and it can be indicate by the DMRS of the PBCH.
[0333] In this way, the flexibility to indicate the duration of a time window can be achieved and without additional signaling overhead, this is suitable for different traffic requirement scenario (s) .
[0334] The present disclosure further introduces a scheme for configuration for extended periodicity of SSB / sync signaling.
[0335] Coverage is one of the key factors that an operator considers when commercializing cellular communication networks due to its direct impact on service quality as well as CAPEX and OPEX. Despite the importance of coverage on the success of NR commercialization, a thorough coverage evaluation and a comparison with legacy RATs considering all NR specification details have not been done until now. For FR1, NR can be deployed either in newly allocated spectrums, such as 3.5GHz or in a spectrum re-farmed from a legacy network, e.g., 3G and 4G. In either case, coverage will be a critical issue considering the fact that these spectrums will most likely handle key mobile services such as voice and low-rate data services. For FR2, coverage was not thoroughly evaluated during the self-evaluation campaign towards IMT-2020 submission and was not considered in Rel-16 enhancements. In these regards, a thorough understanding of NR coverage performance is needed while taking into account the support of the latest NR specification, and thus, in Rel-17 and Rel-18, coverage enhancements for the uplink (UL) channel have been studied.
[0336] Similarly, all satellites for 5G satellite networks (operating in FR1 as well in FR2, and covering both GSO and NGSO constellations) to be deployed in the next 10 years are expected to be designed under the assumptions of optimized power. Due to the large transmission distance, there is a strong need to implement DL coverage enhancement techniques to optimize CAPEX and OPEX for a given targeted coverage, this document mainly focuses on wireless communication between the base station and user device, especially for the case when wireless communication between the base station and user device under Non-Terrestrial Network (NTN) .
[0337] In Rel-18, UL coverage enhancements have been specified as part of NR NTN enhancements, such as repetitions and DMRS bundling. However, during the NR NTN R18 study phase for coverage enhancement, the link-level evaluation identified UL coverage as the bottleneck. However, the evaluation assumptions did not take into account the DL satellite power split among multiple DL satellite beams. The power reduction due to beam splitting is tightly related to the dedicated deployment. A satellite supporting more simultaneous active satellite beams can result in a larger serving area. But on the contrary, it also leads to more reduction of the transmission power over a single beam, naturally yielding more reduced per-beam SNR. Therefore, when the power split is considered, there is a need also for DL coverage enhancement. To confirm the need, a study phase at the RAN1 level, by taking into account the DL satellite power split, to investigate the practical deployment scenarios and DL coverage margin as well as the target DL channel / signal for coverage enhancement. Beam hopping to improve coverage capacity for downlink channels is a suitable way, it is a mechanism for activating / illuminating beams periodically or aperiodically, within a time duration, just a set of beams within all satellite beams can be activated / illuminated, when a satellite beam is activated / illuminated, then UE / gNB can transmit / receives information, for the remaining beams except the set of beams within the all satellite beams, UE / gNB cannot transmit / receives any information. In the current specification, the default periodicity of SSB is 20ms, and based on the current assumption conditions of NTN, it can not to achieve an acceptable coverage ratio, thus, the default periodicity of SSB need to extend. When the default periodicity of SSB / synchronization signaling is extended from 20ms to 160ms / other values, the current mechanism (s) to determine the RO will be caused RO collision between UEs and it also cost more UE power. Thus, some enhancements will be needed.
[0338] This disclosure proposes a mechanism for defining a set of ROs that align with the extended periodicity of SSB / sync signaling, the set of ROs needs to match with the configuration of SSB / sync signaling, and it is used for random access procedure. The following methods can be considered.
[0339] Method 1: A set of valid / available ROs indicated by SIB1 need to be defined. Each SIB1 has a designated time window for determining the valid / available ROs, An RO is considered valid / available if its last symbol or the endpoint falls within the time window, and / or it does not collide with any downlink frame, slot, symbol, or SSB / Sync signaling. UE only can use valid / available RO (s) to transmit RACH sequence. The time window can be defined as starting from the first symbol that locates after the last symbol of the SIB1. Alternatively, the time window can also be starting from the first slot / sub-frame / frame following the last symbol of the SIB1, or from the first slot / sub-frame / frame locate after a slot containing the SIB1, and ending at the following position:
[0340] 1) If the radio frame (denote as current radio frame) of the SSB is an odd radio frame, then the time window is ending at the last symbol of next radio frame, where the SSB is the SIB1 associated.
[0341] 2) If the radio frame (denote as current radio frame) of the SSB is an even radio frame, then the time window is ending at the last symbol of the current radio frame, where the SSB is the SIB1 associated.
[0342] In this way, with no additional signaling overhead, the UE power consumption for transmitting PRACH can be saved.
[0343] Method 2: A duration of a time window can be indicated by PBCH payload / MIB, then UE can use one or more ROs within the time window for PRACH transmission, the granularity of the time window duration can be symbol, slot, sub-frame, frame, or ms. The time window can be defined as starting from the first symbol that locates after the last symbol of the SIB1. Alternatively, the time window can also be starting from the first slot / sub-frame / frame following the last symbol of the SIB1, or from the first slot / sub-frame / frame locate after a slot containing the SIB1. The RACH resources are indicated by the SIB1.
[0344] In some embodiments, a set value of the time window duration can be pre-defined, and it can be indicated by the reserved bits within PBCH / MIB. For instance, 4 value of time window duration can be pre-defined, denote as time duration 1, time duration 2, time duration 3, time duration 4. Then 2 reserved bits within PBCH / MIB can be used to indicate one of the value. “00” can be used to indicate time duration 1, “01” can be used to indicate time duration 2, “10” can be used to indicate time duration 3, “11” can be used to indicate time duration 4.
[0345] In this way, the flexibility to indicate the duration of a time window can be achieved, this is suitable for different traffic requirement scenario (s) .
[0346] Method 3: A duration of a time window can be indicated by SIB1, then UE can use one or more ROs within the time window for PRACH transmission, the granularity of the time window can be symbol, slot, sub-frame, frame, or ms. The time window can be defined as starting from the first symbol that locates after the last symbol of the SIB1. Alternatively, the time window can also be starting from the first slot / sub-frame / frame following the last symbol of the SIB1, or from the first slot / sub-frame / frame locate after a slot containing the SIB1. A set duration value of the time window can be pre-defined, and it can be indicate by a field within SIB1. For instance, 4 value of time window duration can be pre-defined, denote as time duration 1, time duration 2, time duration 3, time duration 4, then a field within SIB1 can be used to indicate one value.
[0347] In this way, the flexibility to indicate the duration of a time window can be achieved and without additional signaling overhead, this is suitable for different traffic requirement scenario (s) .
[0348] Method 4: A set of time offset value (s) can be pre-defined, the granularity of the time offset can be slot, ms, symbol (s) or frame. A reference point for the set of offset can be defined as the last symbol of the SIB1 or the first slot / sub-frame / frame that locates after the last symbol of the SIB1, then the ROs are starting from the referent point plus the offset value, and ending (denote as ending point) at the following position (s) :
[0349] 1) If the radio frame (denote as current radio frame) of the SSB is an odd radio frame, then the time window is ending at the last symbol of next radio frame, where the SSB is the SIB1 associated.
[0350] 2) If the radio frame (denote as current radio frame) of the SSB is a even radio frame, then the time window is ending at the last symbol of the current radio frame, where the SSB is the SIB1 associated.
[0351] In some embodiments, the time offset value can be indicate by SIB1, MIB or PBCH.
[0352] If it’s indicated via PBCH, then (2 bits) can be used to indicate the offset value, a set of pre-defined offset values can be set, and one value within the set can be indicate by Where, denote the bits in a transport block delivered to layer 1 by where is the payload size generated by higher layers. The lowest order information bit is mapped to the most significant bit of the transport block as defined in Clause 6.1.1 of [TS 38.321] . Generate the following additional timing related PBCH payload bits
[0353] If it is indicated via SIB 1, the following ways can be considered:
[0354] 1) Alt1, the time offset is joint coding with random access configuration tables (defined in TS 38.211, e.g., Table 6.3.3.2-1~4) , a new column can be added in a random access configuration table, and the column is used to indicate the time offset value.
[0355] 2) Alt 2, a field within SIB1 can be used to indicate the time offset value.
[0356] In some embodiments, the ROs are located within the time duration between the A and B can be regarded as valid / available ROs, A is the reference point plus the offset value, and B is the ending point.
[0357] The present disclosure further introduces a scheme for configuration of common PDCCH / PDSCH with repetition.
[0358] Coverage is one of the key factors that an operator considers when commercializing cellular communication networks due to its direct impact on service quality as well as CAPEX and OPEX. Despite the importance of coverage on the success of NR commercialization, a thorough coverage evaluation and a comparison with legacy RATs considering all NR specification details have not been done until now. For FR1, NR can be deployed either in newly allocated spectrums, such as 3.5GHz or in a spectrum re-farmed from a legacy network, e.g., 3G and 4G. In either case, coverage will be a critical issue considering the fact that these spectrums will most likely handle key mobile services such as voice and low-rate data services. For FR2, coverage was not thoroughly evaluated during the self-evaluation campaign towards IMT-2020 submission and was not considered in Rel-16 enhancements. In these regards, a thorough understanding of NR coverage performance is needed while taking into account the support of the latest NR specification, and thus, in Rel-17 and Rel-18, coverage enhancements for the uplink (UL) channel have been studied.
[0359] Similarly, all satellites for 5G satellite networks (operating in FR1 as well in FR2, and covering both GSO and NGSO constellations) to be deployed in the next 10 years are expected to be designed under the assumptions of optimized power. Due to the large transmission distance, there is a strong need to implement DL coverage enhancement techniques to optimize CAPEX and OPEX for a given targeted coverage, this document mainly focuses on wireless communication between the base station and user device, especially for the case when wireless communication between the base station and user device under Non-Terrestrial Network (NTN) .
[0360] In the current specification, for operation without shared spectrum channel access and for the SSB and CORESET multiplexing pattern 1, a UE monitors PDCCH in the Type1-PDCCH CSS set over two slots. For SSB with index i, the UE determines an index of slot n0 as that is in a frame with system frame number (SFN) SFNC satisfying SFNcmod2=0 if or in a frame with SFN satisfying SFNcmod2=1 if where μ∈ {0, 1, 2, 3, 5, 6} based on the SCS for PDCCH receptions in the CORESET [TS 38.211] . Thus, when Common PDCCH (e.g., a DCI used to schedule SIB1 or SIBx) with repetition, then the repetition pattern, and how to trigger the common PDCCH with repetition need to study.
[0361] This disclosure proposes a method for determining the repetition pattern of type0-PDCCH and / or the corresponding SIB1 PDSCH, as well as a mechanism to indicate the repetition (the number of repetition) of type0-PDCCH and / or corresponding SIB 1 PDSCH. This approach enhances the coverage of the common PDCCH and SIB1 PDSCH.
[0362] The repetition of type0-PDCCH and corresponding SIB1 PDSCH is indicated by MIB, a bit with MIB can be used to indicate the repetition of Type0-PDCCH and corresponding SIB1 PDSCH.
[0363] The repetition of type0-PDCCH and corresponding SIB1 PDSCH is indicated by PBCH payload, a bit with PBCH payload can be used to indicate the repetition of Type0-PDCCH and corresponding SIB1 PDSCH. can be used to indicate the type0-PDCCH and corresponding SIB1 PDSCH with repetition, e.g., ” 0” can be used to indicate the type0-PDCCH and corresponding SIB1 PDSCH without repetition, “1” can be used to indicate the type0-PDCCH and corresponding SIB1 PDSCH with repetition, where, denote the bits in a transport block delivered to layer 1 by where is the payload size generated by higher layers. The lowest order information bit is mapped to the most significant bit of the transport block as defined in Clause 6.1.1 of [TS 38.321] . Generate the following additional timing related PBCH payload bits
[0364] In some embodiments, can be used to indicate the type0-PDCCH and / or corresponding SIB1 PDSCH with or without repetition, for instance, “00” can be used to indicate type0-PDCCH with repetition and the corresponding SIB1 PDSCH without repetition. “01” can be used to indicate type0-PDCCH without repetition and the corresponding SIB1 PDSCH with repetition, “10” can be used to indicate type0-PDCCH with repetition and the corresponding SIB1 PDSCH also with repetition, and the SIB1 PDSCH transmission within the same slot of the Type0-PDCCH, “11” can be used to indicate type0-PDCCH with repetition and the corresponding SIB1 PDSCH also with repetition, and the first SIB1 PDSCH transmission can be within the same slot of the type0-PDCCH, and the remaining SIB1 PDSCH transmission can be located within different slot (s) of the type0-PDCCH located.
[0365] In some embodiments, the SIB1 PDSCH transmission (with repetition) is based on the first valid / available Type0-PDCCH monitor occasion or the first valid / available type0-PDCCH, and the location of the SIB1 PDSCH is indicated by the first valid / available Type0 PDCCH, for instance, the SIB1 PDSCH transmission can be started at the same slot of the first valid / available type0-PDCCH is located. In the current specification, the Type0-PDCCH is indicated by MIB / PBCH, and due to beam hopping mechanism, not all of the indicated monitor occasion of type0-PDCCH is valid / available, e.g., the type0-PDCCH locates in non-active beam is not valid / available, when UE also monitor PDCCH on the invalid / un-available monitoring occasion (s) , the UE complex and power consumption will be increased. The mechanism proposed above can handle this issue.
[0366] In some embodiments, the Msg4 PDSCH repetition can be indicated via SIB1 or type0-PDCCH implicitly, when SIB1 or type0-PDCCH with repetition, then the Msg4 PDSCH is also with repetition, the number of repetition for Msg4 is equal to: the SIB1 / type0-PDCCH repetition number +offset value or the SIB1 / type0-PDCCH repetition number*factor, the offset value and / or the factor is pre-defined.
[0367] FIG. 12 conceptually illustrates a wireless communication device 600 with which some embodiments of the invention are implemented. The wireless communication device 600 may be a user equipment, a base station, or other nodes in a wireless communication system. The wireless communication device 600 may be a computer (e.g., a desktop computer, personal computer, tablet computer, etc. ) , phone, PDA, or any other sort of electronic device. Such an apparatus includes various types of computer readable media and interfaces for various other types of computer readable media. The wireless communication device 600 includes a processor 602 and a memory 604. The memory 604 is configured to store executable instructions that, when executed by the processor 602, cause the processor to perform any one of the foregoing wireless communication methods.
[0368] The processor 602 may be a single processor or a multi-core processor in different embodiments. In some embodiments, the processor may include a GPU, NPU or DSP which may offload various computations or complement the image processing provided by the processor 602.
[0369] Some embodiments include electronic components, such as microprocessors, storage and memory that store computer program instructions in a machine-readable or computer-readable medium (alternatively referred to as computer-readable storage media, machine-readable media, or machine-readable storage media) . Some examples of such computer-readable media include RAM, ROM, read-only compact discs (CD-ROM) , recordable compact discs (CD-R) , rewritable compact discs (CD-RW) , read-only digital versatile discs (e.g., DVD-ROM, dual-layer DVD-ROM) , a variety of recordable / rewritable DVDs (e.g., DVD-RAM, DVD-RW, DVD+RW, etc. ) , flash memory (e.g., SD cards, mini-SD cards, micro-SD cards, etc. ) , magnetic and / or solid state hard drives, read-only and recordable discs, ultra density optical discs, any other optical or magnetic media, and floppy disks. The computer-readable media may store a computer program that is executable by at least one processing unit and includes sets of instructions for performing various operations. Examples of computer programs or computer code include machine code, such as is produced by a compiler, and files including higher-level code that are executed by a computer, an electronic component, or a microprocessor using an interpreter.
[0370] While the above discussion primarily refers to microprocessor or multi-core processors that execute software, some embodiments are performed by one or more integrated circuits, such as application specific integrated circuits (ASICs) or field programmable gate arrays (FPGAs) . In some embodiments, such integrated circuits execute instructions that are stored on the circuit itself. In addition, some embodiments execute software stored in programmable logic devices (PLDs) , ROM, or RAM devices.
[0371] As used in this specification and any claims of this application, the terms “computer” , “server” , “processor” , and “memory” all refer to electronic or other technological devices. These terms exclude people or groups of people. As used in this specification and any claims of this application, the terms “computer readable medium, ” “computer readable media, ” and “machine readable medium” are entirely restricted to tangible, physical objects that store information in a form that is readable by a computer. These terms exclude any wireless signals, wired download signals, and any other ephemeral signals.
[0372] The present disclosure further provides a computer readable media which is configured to store executable instructions. When the instructions are executed by a processor, the processor may perform any one of the foregoing methods and processes. Many of the above-described features and applications are implemented as software processes that are specified as a set of instructions recorded on a computer readable storage medium (also referred to as computer readable medium) . When these instructions are executed by one or more computational or processing unit (s) (e.g., one or more processors, cores of processors, or other processing units) , they cause the processing unit (s) to perform the actions indicated in the instructions. Examples of computer readable media include, but are not limited to, CD-ROMs, flash drives, random access memory (RAM) chips, hard drives, erasable programmable read only memories (EPROMs) , electrically erasable programmable read-only memories (EEPROMs) , etc. The computer readable media does not include carrier waves and electronic signals passing wirelessly or over wired connections.
[0373] In this specification, the term “software” is meant to include firmware residing in read-only memory or applications stored in magnetic storage which can be read into memory for processing by a processor. Also, in some embodiments, multiple software inventions can be implemented as sub-parts of a larger program while remaining distinct software inventions. In some embodiments, multiple software inventions can also be implemented as separate programs. Finally, any combination of separate programs that together implement a software invention described here is within the scope of the invention. In some embodiments, the software programs, when installed to operate on one or more electronic systems, define one or more specific machine implementations that execute and perform the operations of the software programs.
[0374] While the disclosure has been described with reference to numerous specific details, one of ordinary skill in the art will recognize that the invention can be embodied in other specific forms without departing from the spirit of the invention. In addition, a number of the figures conceptually illustrate processes and methods. The specific operations of these processes may not be performed in the exact order shown and described. The specific operations may not be performed in one continuous series of operations, and different specific operations may be performed in different embodiments. Furthermore, the process could be implemented using several sub-processes, or as part of a larger macro process.
[0375] The foregoing is merely embodiments of the present disclosure, and is not intended to limit the scope of the disclosure. Any transformation of equivalent structure or equivalent process which uses the specification and the accompanying drawings of the present disclosure, or directly or indirectly application in other related technical fields, are likewise included within the scope of the protection of the present disclosure.
Claims
A method for wireless communication, executed by a user equipment (UE) , comprising:reporting a UE capability to support reception (Rx) switching between a plurality of frequency resources to a base station; andreceiving an Rx switching configuration from the base station.The method of claim 1, wherein the UE capability comprises at least one selected from:a set of available frequency resources that are used for the Rx switching;indexes of the set of available frequency resources;one or more available Rx switching points within an available Rx switching periodicity;capability of supporting dynamic indication of the Rx switching; oran available Rx switching duration.The method of claim 2, wherein the UE capability further comprises:a relationship between different frequency resources and a plurality of Rx chains / ports, configured to indicate frequency resources among which each of the Rx chains / ports is capable of switching.The method of claim 1,wherein the UE is pre-configured with a mapping table indicating a plurality sets of available Rx switching durations and / or available Rx switching point types;wherein the UE capability comprises an index corresponding to one of the plurality sets of available Rx switching durations and / or available Rx switching point types.The method of claim 1, wherein the Rx switching configuration comprises a semi-static configured Rx switching pattern.The method of claim 5, wherein the Rx switching configuration is received via a Radio Resource Control (RRC) signaling.The method of claim 5, wherein the Rx switching configuration comprises at least one parameter selected from:an Rx switching duration for switching from one frequency resource to another frequency resource;an Rx switching periodicity of the Rx switching pattern;a location of Rx switching, configured to indicate a starting point of the Rx switching duration within the Rx switching periodicity;an Rx switching duration; ora location of Rx switching and Rx switching duration, configured to indicate a starting point and duration of the Rx switching within the Rx switching periodicity.The method of claim 7, wherein the Rx switching configuration further comprises:an amount of switching period pairs within the Rx switching periodicity; oran amount of switching points within the Rx switching periodicity.The method of claim 7, whereinan amount of switching period pairs within the Rx switching periodicity is predetermined; oran amount of switching points within the Rx switching periodicity is predetermined.The method of claim 7,wherein the location of Rx switching is indicated by a first stage indication and a second stage indication;wherein the first stage indication is configured to indicate a slot or subframe within the Rx switching periodicity;wherein the second stage indication is configured to indicate a symbol position within the slot or subframe.The method of claim 7, further comprising:determining an actual switching point based on a pre-defined reference point within a slot and an available Rx switching duration of the UE.The method of claim 7,wherein the location of Rx switching comprises a plurality of pairs of switching locations;wherein each of the plurality of pairs of switching locations is configured to indicate a first location for switching from a first frequency resource to a second frequency resource and a second location for switching from the second frequency resource to the first frequency resource.The method of claim 7,wherein the location of Rx switching comprises a plurality of switching locations;wherein the plurality of switching locations are configured to indicate a plurality of first locations for switching from a first frequency resource to a second frequency resource and a plurality of second locations for switching from the second frequency resource to the first frequency resource, alternately.The method of claim 5, wherein the Rx switching configuration comprises:an Rx switching duration for switching from one frequency resource to another frequency resource;an Rx switching periodicity of the Rx switching pattern;a location of Rx switching, configured to indicate a starting point for switching from a first frequency resource to a second frequency resource;an Rx on-duration time, configured to indicate a duration for staying at the second frequency resource;an Rx switching duration; ora location of Rx switching and Rx switching duration, configured to indicate a starting point and duration of the Rx switching within the Rx switching periodicity.The method of claim 1, further comprising:sending an Rx switching request to the base station.The method of claim 15, further comprising:determining a time window for receiving a response corresponding to the Rx switching request; andwherein the time window starts from a first symbol after a last symbol of the Rx switching request.The method of claim 15,wherein the Rx switching configuration comprises a plurality of Rx switching patterns;wherein the method further comprises:receiving an Rx switching indication, configured to indicate a selected pattern from the plurality of Rx switching patterns for the UE.The method of claim 15,wherein the Rx switching configuration comprises a plurality of Rx switching patterns;wherein the Rx switching request comprises a request for a target switching pattern from the plurality of Rx switching patterns;wherein the method further comprises:receiving an Rx switching confirmation, configured to confirm the request for the target switching pattern.The method of claim 18,wherein responsive to receiving the Rx switching confirmation, the UE performs Rx switching based on the target switching pattern; orwherein responsive to not receiving the Rx switching confirmation, the UE re-transmits the Rx switching request to the base station; orwherein responsive to not receiving the Rx switching confirmation, the UE performs Rx switching at a first symbol next to the time window.The method of claim 1,wherein the Rx switching configuration comprises a set of candidate Rx switching patterns;wherein the method further comprises:receiving a dynamic indication for a target Rx switching pattern selected from the candidate Rx switching patterns from the base station.The method of claim 20,wherein the dynamic indication is transmitted via a MAC Control Element (MAC-CE) ;wherein the target Rx switching pattern is activated from a last symbol of the MAC-CE plus a time offset;wherein the time offset is pre-defined or indicated by the MAC-CE.The method of claim 20,wherein the dynamic indication is transmitted via a Downlink Control Information (DCI) ;wherein the target Rx switching pattern is activated from a last symbol of the DCI plus a time offset;wherein the time offset is pre-defined.The method of claim 20,wherein the dynamic indication is transmitted by a Cell Radio Network Temporary Identifier (C-RNTI) .The method of claim 20,wherein the dynamic indication is transmitted by a sequence-based signaling;wherein a cycle shift value of the sequence-based signaling is configured to indicate the target Rx switching pattern.The method of claim 1, further comprising:receiving a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback indication which indicates the HARQ-ACK feedback is to be performed on a first frequency resource; andin response to a starting point of the HARQ-ACK feedback locates within a period where an Rx of the UE is working on a second frequency resource, triggering an additional Rx switching.The method of claim 1, further comprising:receiving a dynamic indication configured to indicate one or more parameters of a target Rx switching pattern.The method of claim 26,wherein the dynamic indication is transmitted via a MAC Control Element (MAC-CE) or a Downlink Control Information (DCI) .The method of claim 26,wherein the one or more parameters of the target Rx switching pattern comprise at least one selected from:a target Rx switching duration;a target location of Rx switching;a target Rx on-duration time; ora target location and duration of Rx switching.A method for wireless communication, executed by a base station, comprising:receiving, from a user equipment (UE) , a UE capability to support reception (Rx) switching between a plurality of frequency resources;determining an Rx switching configuration based on the UE capability; andtransmitting the Rx switching configuration to the UE.The method of claim 29, wherein the UE capability comprises at least one selected from:a set of available frequency resources that are used for the Rx switching;indexes of the set of available frequency resources;one or more available Rx switching points within an available Rx switching periodicity;capability of supporting dynamic indication of the Rx switching; oran available Rx switching duration.The method of claim 30, wherein the UE capability further comprises:a relationship between different frequency resources and a plurality of Rx chains / ports, configured to indicate frequency resources among which each of the Rx chains / ports is capable of switching.The method of claim 29,wherein the base station is pre-configured with a mapping table indicating a plurality sets of available Rx switching durations and / or available Rx switching point types;wherein the UE capability comprises an index corresponding to one of the plurality sets of available Rx switching durations and / or available Rx switching point types.The method of claim 29, wherein the Rx switching configuration comprises a semi-static configured Rx switching pattern.The method of claim 33, wherein the Rx switching configuration is transmitted via a Radio Resource Control (RRC) signaling.The method of claim 33, wherein the Rx switching configuration comprises at least one parameter selected from:an Rx switching duration for switching from one frequency resource to another frequency resource;an Rx switching periodicity of the Rx switching pattern;a location of Rx switching, configured to indicate a starting point of the Rx switching duration within the Rx switching periodicity;an Rx switching duration; ora location of Rx switching and Rx switching duration, configured to indicate a starting point and duration of the Rx switching within the Rx switching periodicity.The method of claim 35, wherein the Rx switching configuration further comprises:an amount of switching period pairs within the Rx switching periodicity; oran amount of switching points within the Rx switching periodicity.The method of claim 35, whereinan amount of switching period pairs within the Rx switching periodicity is predetermined; oran amount of switching points within the Rx switching periodicity is predetermined.The method of claim 35,wherein the location of Rx switching is indicated by a first stage indication and a second stage indication;wherein the first stage indication is configured to indicate a slot or subframe within the Rx switching periodicity;wherein the second stage indication is configured to indicate a symbol position within the slot or subframe.The method of claim 35,wherein the location of Rx switching comprises a plurality of pairs of switching locations;wherein each of the plurality of pairs of switching locations is configured to indicate a first location for switching from a first frequency resource to a second frequency resource and a second location for switching from the second frequency resource to the first frequency resource.The method of claim 35,wherein the location of Rx switching comprises a plurality of switching locations;wherein the plurality of switching locations are configured to indicate a plurality of first locations for switching from a first frequency resource to a second frequency resource and a plurality of second locations for switching from the second frequency resource to the first frequency resource, alternately.The method of claim 33, wherein the Rx switching configuration comprises:an Rx switching duration for switching from one frequency resource to another frequency resource;an Rx switching periodicity of the Rx switching pattern;a location of Rx switching, configured to indicate a starting point for switching from a first frequency resource to a second frequency resource;an Rx on-duration time, configured to indicate a duration for staying at the second frequency resource;an Rx switching duration; ora location of Rx switching and Rx switching duration, configured to indicate a starting point and duration of the Rx switching within the Rx switching periodicity.The method of claim 29, further comprising:receiving an Rx switching request from the UE.The method of claim 42, further comprising:transmitting a response for the Rx switching request within a time window;wherein the time window starts from a first symbol after a last symbol of the Rx switching request.The method of claim 42,wherein the Rx switching configuration comprises a plurality of Rx switching patterns;wherein the method further comprises:transmitting an Rx switching indication, configured to indicate a selected pattern from the plurality of Rx switching patterns for the UE.The method of claim 42,wherein the Rx switching configuration comprises a plurality of Rx switching patterns;wherein the Rx switching request comprises a request for a target switching pattern from the plurality of Rx switching patterns;wherein the method further comprises:transmitting an Rx switching confirmation, configured to confirm the request for the target switching pattern.The method of claim 29,wherein the Rx switching configuration comprises a set of candidate Rx switching patterns;wherein the method further comprises:transmitting a dynamic indication for a target Rx switching pattern selected from the candidate Rx switching patterns to the UE.The method of claim 46,wherein the dynamic indication is transmitted via a MAC Control Element (MAC-CE) ;wherein the target Rx switching pattern is activated from a last symbol of the MAC-CE plus a time offset;wherein the time offset is pre-defined or indicated by the MAC-CE.The method of claim 46,wherein the dynamic indication is transmitted via a Downlink Control Information (DCI) ;wherein the target Rx switching pattern is activated from a last symbol of the DCI plus a time offset;wherein the time offset is pre-defined.The method of claim 46,wherein the dynamic indication is transmitted by a Cell Radio Network Temporary Identifier (C-RNTI) .The method of claim 46,wherein the dynamic indication is transmitted by a sequence-based signaling;wherein a cycle shift value of the sequence-based signaling is configured to indicate the target Rx switching pattern.The method of claim 29, further comprising:transmitting, to the UE, a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback indication which indicates the HARQ-ACK feedback is to be performed on a first frequency resource;wherein the HARQ-ACK feedback indication is configured for determination of an additional Rx switching.The method of claim 29, further comprising:transmitting a dynamic indication configured to indicate one or more parameters of a target Rx switching pattern.The method of claim 52,wherein the dynamic indication is transmitted via a MAC Control Element (MAC-CE) or a Downlink Control Information (DCI) .The method of claim 52,wherein the one or more parameters of the target Rx switching pattern comprise at least one selected from:a target Rx switching duration;a target location of Rx switching;a target Rx on-duration time; ora target location and duration of Rx switching.A method for wireless communication in Random Access process, executed by a user equipment (UE) , comprising:reporting a UE capability to support transmission (Tx) or reception (Rx) switching between a plurality of frequency resources to a base station; anddetermining a Tx or Rx switching pattern.The method of claim 55,wherein the UE is preconfigured with a plurality of Random Access Channel (RACH) sequences, which are associated with the UE capability to support the Tx or Rx switching;wherein the reporting the UE capability to support the Tx or Rx switching comprises:transmitting a specific RACH sequence selected from the plurality of RACH sequences to the base station.The method of claim 55,wherein the UE is preconfigured with a plurality of Random Access Channel Occasions (ROs) , which are associated with the UE capability to support the Tx or Rx switching;wherein the reporting the UE capability to support the Tx or Rx switching comprises:transmitting a RACH sequence over a specific RO selected from the plurality of ROs to the base station.The method of claim 55,wherein the UE is preconfigured with a plurality of Random Access Channel (RACH) formats, which are associated with the UE capability to support the Tx or Rx switching;wherein the reporting the UE capability to support the Tx or Rx switching comprises:selecting a specific RACH format from the plurality of RACH formats for message 1 (Msg1) transmission.The method of claim 55,wherein the UE is preconfigured with a plurality of time or frequency (T / F) resource allocations for Random Access Channel Occasions (ROs) , which are associated with the UE capability to support the Tx or Rx switching;wherein the reporting the UE capability to support the Tx or Rx switching comprises:transmitting a RACH sequence based on a specific T / F resource allocation selected from the plurality of T / F resource allocations.The method of claim 55, wherein the Tx or Rx switching pattern comprises an Rx switching pattern for message 2 (Msg2) reception.The method of claim 60, further comprising:detecting a Downlink Control Information (DCI) with a Cyclic Redundancy Check (CRC) scrambled by a corresponding Random Access-Radio Network Temporary Identifier (RA-RNTI) within a Random Access Response (RAR) window;wherein the RAR window starts at a first symbol of an earliest CORESET where the UE is configured to receive Physical Downlink Control Channel (PDCCH) for Type1-PDCCH Common Search Space (CSS) set, which is after a last symbol of a Tx or Rx switching periodicity indicated by the Rx switching pattern; orwherein when a UE time adjustment parameteror a common time adjustment parameter is non-zero, the RAR window starts after an additional TTA+kmac millisecond, wherein TTA is a predefined time advance value and kmac is determined based on a parameter kmac.The method of claim 60,wherein the UE is preconfigured with a plurality of RACH sequences, which are associated with a plurality of Rx switching patterns;wherein the method further comprises:transmitting a specific RACH sequence selected from the plurality of RACH sequences to the base station.The method of claim 60,wherein the UE is preconfigured with a plurality of time or frequency (T / F) resource allocations for Random Access Channel Occasions (ROs) , which are associated with a plurality of Rx switching patterns;wherein the method further comprisestransmitting a RACH sequence based on a specific T / F resource allocation selected from the plurality of T / F resource allocations.The method of claim 55, wherein the Tx or Rx switching pattern comprises an Rx switching pattern for message 4 (Msg4) reception.The method of claim 64, further comprising:transmitting a message 3 (Msg3) to the base station;wherein a filed within the Msg3 is configured to indicated the Rx switching pattern for Msg4 reception.The method of claim 64, further comprising:transmitting a message 3 (Msg3) to the base station;wherein time or frequency (TF) resources or a starting point of the Msg3 is configured to indicate the Rx switching pattern for Msg4 reception.The method of claim 55, wherein the Tx or Rx switching pattern is for message 3 (Msg3) transmission.The method of claim 67, wherein the determining the Tx or Rx switching pattern comprises:receiving a Random Access Response (RAR) ; anddetermining the Tx or Rx switching pattern based on a filed within the RAR.The method of claim 67, wherein the determining the Tx or Rx switching pattern comprises:receiving a Random Access Response (RAR) ; anddetermining the Tx or Rx switching pattern based on time or frequency (T / F) resources or a starting point of T / F resources of the RAR.The method of claim 67, wherein the determining the Tx or Rx switching pattern comprises:receiving a scheduling DCI of a Random Access Response (RAR) ; anddetermining the Tx or Rx switching pattern based on a filed within the scheduling DCI of the RAR.The method of claim 67, wherein the determining the Tx or Rx switching pattern comprises:receiving a scheduling DCI of a Random Access Response (RAR) ; anddetermining the Tx or Rx switching pattern based on time or frequency (T / F) resources or a starting point of T / F resources of the scheduling DCI of the RAR.The method of claim 55, wherein the Tx or Rx switching pattern is for message 5 (Msg5) transmission.The method of claim 72, wherein the determining the Tx or Rx switching pattern comprises:receiving a message 4 (Msg4) ; anddetermining the Tx or Rx switching pattern based on a filed within the Msg4.The method of claim 72, wherein the determining the Tx or Rx switching pattern comprises:receiving a message 4 (Msg4) ; anddetermining the Tx or Rx switching pattern based on time or frequency (T / F) resources or a starting point of T / F resources of the Msg4.The method of claim 72, wherein the determining the Tx or Rx switching pattern comprises:receiving a scheduling DCI of a message 4 (Msg4) ; anddetermining the Tx or Rx switching pattern based on a filed within the scheduling DCI of the Msg4.The method of claim 72, wherein the determining the Tx or Rx switching pattern comprises:receiving a scheduling DCI of a message 4 (Msg4) ; anddetermining the Tx or Rx switching pattern based on time or frequency (T / F) resources or a starting point of T / F resources of the scheduling DCI of the Msg4.A method for wireless communication in Random Access process, executed by a base station, comprising:receiving, from a user equipment (UE) , a UE capability to support transmission (Tx) or reception (Rx) switching between a plurality of frequency resources; anddetermining a Tx or Rx switching pattern.The method of claim 77,wherein the UE is preconfigured with a plurality of Random Access Channel (RACH) sequences, which are associated with the UE capability to support the Tx or Rx switching;wherein the receiving the UE capability to support the Tx or Rx switching comprises:receiving a specific RACH sequence selected from the plurality of RACH sequences from the UE.The method of claim 77,wherein the UE is preconfigured with a plurality of Random Access Channel Occasions (ROs) , which are associated with the UE capability to support the Tx or Rx switching;wherein the receiving the UE capability to support the Tx or Rx switching comprises:receiving a RACH sequence over a specific RO selected from the plurality of ROs from the UE.The method of claim 77,wherein the UE is preconfigured with a plurality of Random Access Channel (RACH) formats, which are associated with the UE capability to support the Tx or Rx switching;wherein the receiving the UE capability to support the Tx or Rx switching comprises:acquiring a specific RACH format from the plurality of RACH formats for message 1 (Msg1) transmission.The method of claim 77,wherein the UE is preconfigured with a plurality of time or frequency (T / F) resource allocations for Random Access Channel Occasions (ROs) , which are associated with the UE capability to support the Tx or Rx switching;wherein the receiving the UE capability to support the Tx or Rx switching comprises:receiving a RACH sequence based on a specific T / F resource allocation selected from the plurality of T / F resource allocations.The method of claim 77, wherein the Tx or Rx switching pattern comprises an Rx switching pattern for message 2 (Msg2) reception.The method of claim 82, further comprising:transmitting a Downlink Control Information (DCI) with a Cyclic Redundancy Check (CRC) scrambled by a corresponding Random Access-Radio Network Temporary Identifier (RA-RNTI) within a Random Access Response (RAR) window;wherein the RAR window starts at a first symbol of an earliest CORESET where the UE is configured to receive Physical Downlink Control Channel (PDCCH) for Type1-PDCCH Common Search Space (CSS) set, which is after a last symbol of a Tx or Rx switching periodicity indicated by the Rx switching pattern; orwherein when a UE time adjustment parameteror a common time adjustment parameter is non-zero, the RAR window starts after an additional TTA+kmac millisecond, wherein TTA is a predefined time advance value and kmac is determined based on a parameter kmac.The method of claim 82,wherein the base station is preconfigured with a plurality of RACH sequences, which are associated with a plurality of Rx switching patterns;wherein the method further comprises:receiving a specific RACH sequence selected from the plurality of RACH sequences from the UE.The method of claim 82,wherein the base station is preconfigured with a plurality of time or frequency (T / F) resource allocations for Random Access Channel Occasions (ROs) , which are associated with a plurality of Rx switching patterns;wherein the method further comprisesreceiving a RACH sequence based on a specific T / F resource allocation selected from the plurality of T / F resource allocations.The method of claim 77, wherein the Tx or Rx switching pattern comprises an Rx switching pattern for message 4 (Msg4) reception.The method of claim 86, further comprising:receiving a message 3 (Msg3) from the UE;wherein a filed within the Msg3 is configured to indicated the Rx switching pattern for Msg4 reception.The method of claim 86, further comprising:receiving a message 3 (Msg3) from the UE;wherein time or frequency (TF) resources or a starting point of the Msg3 is configured to indicate the Rx switching pattern for Msg4 reception.The method of claim 77, wherein the Tx or Rx switching pattern is for message 3 (Msg3) transmission.The method of claim 89, further comprising:transmitting a Random Access Response (RAR) , wherein a filed within the RAR is configured to indicate the determined Tx or Rx switching pattern.The method of claim 89, further comprising:transmitting a Random Access Response (RAR) , wherein time or frequency (T / F) resources or a starting point of T / F resources of the RAR is configured to indicate the determined Tx or Rx switching pattern.The method of claim 89, further comprising:transmitting a scheduling DCI of a Random Access Response (RAR) , wherein a filed within the scheduling DCI of the RAR is configured to indicate the determined Tx or Rx switching pattern.The method of claim 89, further comprising:transmitting a scheduling DCI of a Random Access Response (RAR) , wherein time or frequency (T / F) resources or a starting point of T / F resources of the scheduling DCI of the RAR is configured to indicate the determined Tx or Rx switching pattern.The method of claim 77, wherein the Tx or Rx switching pattern is for message 5 (Msg5) transmission.The method of claim 94, further comprising:transmitting a a message 4 (Msg4) , wherein a filed within the Msg4 is configured to indicate the determined Tx or Rx switching pattern.The method of claim 94, further comprising:transmitting a a message 4 (Msg4) , wherein time or frequency (T / F) resources or a starting point of T / F resources the Msg4 is configured to indicate the determined Tx or Rx switching pattern.The method of claim 94, further comprising:transmitting a scheduling DCI of a message 4 (Msg4) , wherein a filed within the scheduling DCI of the Msg4 is configured to indicate the determined Tx or Rx switching pattern.The method of claim 94, further comprising:transmitting a scheduling DCI of a message 4 (Msg4) , wherein time or frequency (T / F) resources or a starting point of T / F resources of the scheduling DCI of the Msg4 is configured to indicate the determined Tx or Rx switching pattern.A method for wireless communication, executed by a user equipment (UE) , comprising:reporting a UE capability to support transmission (Tx) and / or reception (Rx) switching between a plurality of candidate frequency resources within a single group or across a plurality of groups to a base station.The method of claim 99,wherein the plurality of candidate frequency resources are divided into the plurality of groups based on a range of their center carrier frequency; orwherein the plurality of candidate frequency resources are divided into the plurality of groups based on their Sub-Carrier Spacing (SCS) .The method of claim 99, wherein the UE capability comprises at least one selected from:capability of supporting Tx switching within the single group;capability of supporting Tx switching across the plurality of groups;a Tx switching period within the single group;a Tx switching period across the plurality of groups; ora Tx which corresponds to a frequency resource or a set of frequency resources within one or more of the plurality of groups.The method of claim 99, wherein the UE capability comprises at least one selected from:capability of supporting Rx switching within the single group;capability of supporting Rx switching across the plurality of groups;an Rx switching period within the single group;an Rx switching period across the plurality of groups; oran Rx which corresponds to a frequency resource or a set of frequency resources within one or more of the plurality of groups.The method of claim 99, wherein the UE capability comprises at least one selected from:capability of supporting Tx and Rx switching within the single group;capability of supporting Tx and Rx switching across the plurality of groups;a Tx and Rx switching period within the single group;a Tx and Rx switching period across the plurality of groups; ora Tx and an Rx which correspond to a frequency resource or a set of frequency resources within one or more of the plurality of groups.The method of claim 99, further comprising:receiving one or more Tx and / or Rx switching parameters from the base station.A method for wireless communication, executed by a base station, comprising:receiving a UE capability to support transmission (Tx) and / or reception (Rx) switching between a plurality of candidate frequency resources within a single group or across a plurality of groups from a user equipment (UE) .The method of claim 105,wherein the plurality of candidate frequency resources are divided into the plurality of groups based on a range of their center carrier frequency; orwherein the plurality of candidate frequency resources are divided into the plurality of groups based on their Sub-Carrier Spacing (SCS) .The method of claim 105, wherein the UE capability comprises at least one selected from:capability of supporting Tx switching within the single group;capability of supporting Tx switching across the plurality of groups;a Tx switching period within the single group;a Tx switching period across the plurality of groups; ora Tx which corresponds to a frequency resource or a set of frequency resources within one or more of the plurality of groups.The method of claim 105, wherein the UE capability comprises at least one selected from:capability of supporting Rx switching within the single group;capability of supporting Rx switching across the plurality of groups;an Rx switching period within the single group;an Rx switching period across the plurality of groups; oran Rx which corresponds to af frequency resource or a set of frequency resources within one or more of the plurality of groups.The method of claim 105, wherein the UE capability comprises at least one selected from:capability of supporting Tx and Rx switching within the single group;capability of supporting Tx and Rx switching across the plurality of groups;a Tx and Rx switching period within the single group;a Tx and Rx switching period across the plurality of groups; ora Tx and an Rx which correspond to a frequency resource or a set of frequency resources within one or more of the plurality of groups.The method of claim 105, further comprising:transmitting one or more Tx and / or Rx switching parameters to the UE.A method for wireless communication, executed by a user equipment (UE) , comprising:determining a reception (Rx) switching pattern;obtaining a first period and a first frequency resource for data reception based on the Rx switching pattern;obtaining a second period and a second frequency resource for performing measurement; anddetermining whether to perform an additional Rx switching to switch from the first frequency resource to the second frequency resource when the first period overlaps the second period.The method of claim 111, wherein whether to perform the additional Rx switching is determined based on a priority rule.The method of claim 112, wherein the priority rule comprises:measurement on a primary cell (Pcell) having a highest priority;measurement on a secondary cell (Scell) having a second highest priority;data reception on the Pcell having a third highest priority; anddata reception on the Scell having a lowest priority.The method of claim 112, wherein the priority rule comprises:dynamic scheduling data on a primary cell (Pcell) having a highest priority;dynamic scheduling data on a secondary cell (Scell) having a second highest priority;measurement on the Pcell having a third highest priority;measurement on the Scell having a fourth highest priority;other data reception on the Pcell having a fifth highest priority; andother data reception on the Scell having a lowest priority.The method of claim 111, wherein whether to perform the additional Rx switching is determined based on a triggering indication from the base station.The method of claim 115, wherein the triggering indication is transmitted via a MAC Control Element (MAC-CE) , a Downlink Control Information (DCI) or a sequence-based signaling.The method of claim 111, wherein the determining whether to perform the additional Rx switching comprises:determining not to perform the additional Rx switching and staying at the first frequency resource based on the Rx switching pattern.The method of claim 111, wherein the determining whether to perform the additional Rx switching comprises:when the second frequency resource is a Primary cell (Pcell) and the first frequency resource is a Secondary cell (Scell) , determining to perform the additional Rx switching; orwhen the first frequency resource is the Pcell and the second frequency resource is the Scell, determining to stay on the first frequency resource.The method of claim 111, wherein the determining whether to perform the additional Rx switching comprises:when a carrier index of the first frequency resource is larger than a carrier index of the second frequency resource, determining to perform the additional Rx switching; orwhen the carrier index of the firs frequency resource is less than the carrier index of the second frequency resource, determining to stay on the first frequency resource.The method of claim 111, wherein whether to perform the additional Rx switching is determined based on Sub-Carrier Spacing (SCS) of the first frequency resource and the second frequency resource.The method of claim 111, wherein a starting point of the additional Rx switching is determined based on a starting point of the second period for performing measurement.The method of claim 111, wherein a starting point of the additional Rx switching is determined based on a starting point of an overlapped period between the first period for data reception and the second period for performing measurement.A method for wireless communication, executed by a base station, comprising:determining a reception (Rx) switching pattern for a user equipment (UE) ;obtaining a first period and a first frequency resource for data transmission based on the Rx switching pattern;obtaining a second period and a second frequency resource for performing measurement at the UE; anddetermining whether to perform an additional Rx switching to switch from the first frequency resource to the second frequency resource when the first period overlaps the second period.The method of claim 123, wherein whether to perform the additional Rx switching is determined based on a priority rule.The method of claim 124, wherein the priority rule comprises:measurement on a primary cell (Pcell) having a highest priority;measurement on a secondary cell (Scell) having a second highest priority;data reception on the Pcell having a third highest priority; anddata reception on the Scell having a lowest priority.The method of claim 124, wherein the priority rule comprises:dynamic scheduling data on a primary cell (Pcell) having a highest priority;dynamic scheduling data on a secondary cell (Scell) having a second highest priority;measurement on the Pcell having a third highest priority;measurement on the Scell having a fourth highest priority;other data reception on the Pcell having a fifth highest priority; andother data reception on the Scell having a lowest priority.The method of claim 123, further comprising:transmitting a triggering indication configured to indicate whether to perform the additional Rx switching to the UE.The method of claim 127, wherein the triggering indication is transmitted via a MAC Control Element (MAC-CE) , a Downlink Control Information (DCI) or a sequence-based signaling.The method of claim 123, wherein the determining whether to perform the additional Rx switching comprises:determining not to perform the additional Rx switching and staying at the first frequency resource based on the Rx switching pattern.The method of claim 123, wherein the determining whether to perform the additional Rx switching comprises:when the second frequency resource is a Primary cell (Pcell) and the first frequency resource is a Secondary cell (Scell) , determining to perform the additional Rx switching; orwhen the first frequency resource is the Pcell and the second frequency resource is the Scell, determining to stay on the first frequency resource.The method of claim 123, wherein the determining whether to perform the additional Rx switching comprises:when a carrier index of the first frequency resource is larger than a carrier index of the second frequency resource, determining to perform the additional Rx switching; orwhen the carrier index of the firs frequency resource is less than the carrier index of the second frequency resource, determining to stay on the first frequency resource.The method of claim 123, wherein whether to perform the additional Rx switching is determined based on Sub-Carrier Spacing (SCS) of the first frequency resource and the second frequency resource.The method of claim 123, wherein a starting point of the additional Rx switching is determined based on a starting point of the second period for performing measurement.The method of claim 123, wherein a starting point of the additional Rx switching is determined based on a starting point of an overlapped period between the first period for data reception and the second period for performing measurement.A wireless communication device, comprising a processor and a memory, wherein the memory is configured to store executable instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1 to 134.A non-transitory computer readable medium storing executable instructions that, when executed by a processor, cause the processor to perform the method of any of claims 1 to 134.