Method for wireless communication

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment may be configured to monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message. The base station may identify downlink data for the user equipment and may send a signal to the user equipment. A user equipment may receive a signal within a first search space. In some cases, the signal may include a command to activate the second search space. The user equipment may monitor a second set of decoding candidates within a second search space based on the received signal. A user equipment communicates with a base station based on monitoring a first set of decoding candidates within a first search space and a second set of decoding candidates within a second search space.

Description

[0001] This application is a divisional application of the invention patent application with the application date of January 6, 2020, application number: 202080007792.9, and invention name: "Search space activation for channel monitoring".

[0002] CROSS-REFERENCE This patent application claims priority to U.S. Patent Application No. 16 / 734,250, filed on January 3, 2020 by HOSSEINI et al., entitled “SEARCH SPACE ACTIVATION FOR CHANNEL MONITORING,” and U.S. Provisional Patent Application No. 62 / 789,851, filed on January 8, 2019 by HOSSEINI et al., entitled “SEARCH SPACE ACTIVATION FOR CHANNEL MONITORING,” each of which is assigned to the present assignee. Technical Field

[0003] The following relates generally to wireless communications and, more particularly, to search space activation for channel monitoring. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-APro systems, and fifth generation (5G) systems known as new radio (NR) systems. These systems can use techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports communication for multiple communication devices, which may also be referred to as user equipment (UE).

[0005] In some wireless communication systems, search spaces may be configured for UEs. These search spaces may include one or more control resource sets (CORESETs) that include multiple control channel elements (CCEs). Some search space configuration techniques may be imperfect for some communications, such as ultra-reliable low-latency communications, and improved search space configuration techniques are needed. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and apparatuses that support search space activation for channel monitoring. In general, the described technology supports search space activation for ultra-reliable low-latency communications. In some systems, a base station may send control information to a user equipment (UE) within one or more search space decoding candidates. The base station may configure a search space set by hashing these decoding candidates within a set of control channel elements (CCEs) at one or more aggregation levels. In some cases, the UE may be configured to monitor a first set of decoding candidates in a first search space. In some cases, the base station may identify a packet, such as a downlink data packet, for the UE, and may schedule downlink transmission of the data packet. The base station may send an indication to the UE, wherein the indication may include a command for the UE to switch the search space set. In some cases, the UE may be configured to switch the search space set to monitor more opportunities or a larger number of candidates.

[0007] In some cases, based on decoding the received command, the UE may begin monitoring the second set of decoding candidates within the second search space. For example, the UE may monitor the second set of decoding candidates within the second search space based on receiving the command. In some cases, the UE may stop monitoring the first set of decoding candidates in the first search space, and may monitor the second set of decoding candidates in the second search space. In some cases, the UE may send a message confirming a signal received in the first search space. Based on sending the confirmation message, the UE may stop monitoring the first set of decoding candidates in the first search space, and may start monitoring the second set of decoding candidates in the second search space. In some cases, the UE may be configured to monitor the first search space and the second search space simultaneously.

[0008] A method of conducting wireless communications is described. The method may include monitoring a first set of decoding candidates within a first search space to receive a physical downlink control channel message, receiving a signal from a base station within the first search space, the signal including a command to activate a second search space, monitoring a second set of decoding candidates within the second search space based on the received signal, and communicating with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0009] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message, receive a signal from a base station within the first search space, the signal including a command to activate a second search space, monitor a second set of decoding candidates within the second search space based on the received signal, and communicate with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0010] Another apparatus for wireless communication is described. The apparatus may include components for monitoring a first set of decoding candidates within a first search space to receive a physical downlink control channel message, receiving a signal from a base station within the first search space, the signal including a command to activate a second search space, monitoring a second set of decoding candidates within the second search space based on the received signal, and communicating with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0011] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executed by a processor to: monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message, receive a signal from a base station within the first search space, the signal including a command to activate a second search space, monitor a second set of decoding candidates within the second search space based on the received signal, and communicate with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a message confirming a signal received within a first search space, wherein monitoring a second set of decoding candidates within a second search space may be based on sending the message.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for causing monitoring of a first set of decoding candidates within a first search space and monitoring of a second set of decoding candidates within a second search space to occur simultaneously. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for monitoring the first set of decoding candidates within the first search space for a threshold duration after receiving a signal, wherein monitoring the second set of decoding candidates within the second search space occurs after expiration of the threshold duration.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a second signal from a base station in the first search space, the second signal including a command for releasing the first search space, wherein monitoring the second set of decoding candidates in the second search space may be based on receiving the second signal. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for stopping monitoring the first set of decoding candidates in the first search space based on receiving the signal.

[0015] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the signal includes a downlink control indicator. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for identifying an index value of a position of the downlink control indicator, and determining one or more monitoring opportunities of the second search space based on the index value of the position, wherein monitoring the second set of decoding candidates may be based on the one or more monitoring opportunities.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for identifying a bitmap included in a downlink control indicator and determining one or more monitoring opportunities for a second search space based on the bitmap, wherein monitoring the second set of decoding candidates may be based on the one or more monitoring opportunities.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the bitmap includes 14 bits. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for initializing a timer associated with the second search space based on the received signal, wherein monitoring the second set of decoding candidates within the second search space may be based on the timer.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for initializing a timer associated with a second search space based on a received signal, receiving a second signal associated with reception of downlink data within the second search space from a base station, and reinitializing the timer associated with the second search space based on receiving the second signal, wherein monitoring a second set of decoding candidates within the second search space can be based on the timer.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for stopping monitoring a second set of decoding candidates within a second search space based on expiration of a timer. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a second signal from a base station within the second search space, the second signal including a command for releasing the second search space, and stopping monitoring a second set of decoding candidates within the second search space based on receiving the second signal.

[0020] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second signal may be included in a downlink control indicator. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a second signal associated with receiving downlink data in the first search space from a base station, and stopping monitoring a second set of decoding candidates in the second search space based on receiving the second signal.

[0021] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a scheduling request for an upcoming uplink transmission to a base station, wherein monitoring a second set of decoding candidates within a second search space may be based on sending the scheduling request. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a second signal from the base station within the second search space, the second signal including a command for activating a third search space, and monitoring a third set of decoding candidates within the third search space based on receiving the second signal.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a third signal from a base station in a third search space, the third signal including a command for releasing the third search space and reverting to the second search space, and monitoring a second set of decoding candidates in the second search space based on receiving the third signal. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a third signal from a base station in a third search space, the third signal including a command for releasing the third search space and reverting to the first search space, and monitoring a first set of decoding candidates in the first search space based on receiving the third signal.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for initializing a first timer associated with a third search space based on receiving a second signal, monitoring a second set of decoding candidates within the second search space based on expiration of the first timer, initializing a second timer associated with the second search space based on monitoring the second set of decoding candidates within the second search space, and monitoring the first set of decoding candidates within the first search space based on expiration of the second timer.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a third set of decoding candidates within the third search space may be larger than a second set of decoding candidates within the second search space. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a third set of decoding candidates within the third search space may be associated with bidirectional data transmission.

[0025] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a physical downlink control channel message may be associated with ultra-reliable low-latency communications. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first periodicity associated with a first set of decoding candidates within a first search space may be greater than a second periodicity associated with a second set of decoding candidates within a second search space.

[0026] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the second search space includes more decoding candidates in a monitoring opportunity than the first search space, the first search space and the second search space have an equal number of monitoring opportunities per time slot, or the second search space and the first search space include an equal number of decoding candidates in a monitoring opportunity, the second search space has more monitoring opportunities per time slot than the first search space, or a combination thereof. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the command to activate the second search space includes 2 bits.

[0027] A method of conducting wireless communications is described. The method may include identifying downlink data for a UE configured to monitor a first set of decoding candidates within a first search space, sending a signal to the UE within the first search space based on the downlink data, the signal including a command to activate a second search space associated with a second set of decoding candidates, and communicating with the UE based on sending the signal within the first search space.

[0028] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: identify downlink data to a UE configured to monitor a first set of decoding candidates within a first search space, send a signal to the UE within the first search space based on the downlink data, the signal including a command to activate a second search space associated with a second set of decoding candidates, and communicate with the UE based on sending the signal within the first search space.

[0029] Another apparatus for wireless communication is described. The apparatus may include components for: identifying downlink data for a UE configured to monitor a first set of decoding candidates within a first search space, sending a signal to the UE within the first search space based on the downlink data, the signal including a command for activating a second search space associated with a second set of decoding candidates, and communicating with the UE based on sending the signal within the first search space.

[0030] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executed by a processor to: identify downlink data for a UE configured to monitor a first set of decoding candidates within a first search space, send a signal to the UE within the first search space based on the downlink data, the signal including a command to activate a second search space associated with a second set of decoding candidates, and communicate with the UE based on sending the signal within the first search space.

[0031] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to monitor a second set of decoding candidates within a second search space based on the transmitted signal. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a message from the UE confirming the signal transmitted within the first search space.

[0032] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to simultaneously monitor a first set of decoding candidates within a first search space and a second set of decoding candidates within a second search space. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to monitor the first set of decoding candidates within the first search space within a threshold duration after transmitting a signal, and configuring the UE to monitor the second set of decoding candidates within the second search space after the threshold duration expires.

[0033] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a second signal to the UE within the first search space, the second signal including a command for releasing the first search space, and configuring the UE to monitor a second set of decoding candidates within the second search space based on sending the second signal. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to stop monitoring the first set of decoding candidates within the first search space based on sending the signal.

[0034] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the signal includes a downlink control indicator. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to initialize a timer associated with the second search space based on the transmitted signal, and configuring the UE to monitor a second set of decoding candidates within the second search space based on the timer.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to initialize a timer associated with a second search space based on sending the signal, sending a second signal associated with the sending of downlink data within the second search space to the UE, configuring the UE to reinitialize the timer associated with the second search space based on sending the second signal, and configuring the UE to monitor a second set of decoding candidates within the second search space based on the timer.

[0036] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to stop monitoring the second set of decoding candidates within the second search space based on expiration of the timer.

[0037] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a second signal to the UE within a second search space, the second signal including a command for releasing the second search space, and configuring the UE to stop monitoring a second set of decoding candidates within the second search space based on sending the second signal.

[0038] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second signal may be included in a downlink control indicator. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a second signal associated with the transmission of downlink data in the first search space to the UE, and configuring the UE to stop monitoring a second set of decoding candidates in the second search space based on sending the second signal.

[0039] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a scheduling request for uplink transmission from a UE, and configuring the UE to monitor a second set of decoding candidates within a second search space based on receiving the scheduling request. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a second signal to the UE within the second search space, the second signal including a command for activating a third search space associated with a third set of decoding candidates.

[0040] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a third signal to the UE within the third search space, the third signal including a command for releasing the third search space and reverting to the second search space. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a third signal to the UE within the third search space, the third signal including a command for releasing the third search space and reverting to the first search space.

[0041] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for configuring the UE to initialize a first timer associated with a third search space based on sending a second signal, configuring the UE to monitor a second set of decoding candidates within the second search space based on expiration of the first timer, configuring the UE to initialize a second timer associated with the second search space based on monitoring the second set of decoding candidates within the second search space, and configuring the UE to monitor the first set of decoding candidates within the first search space based on expiration of the second timer.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a third set of decoding candidates within the third search space may be larger than a second set of decoding candidates within the second search space. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a third set of decoding candidates within the third search space may be associated with bidirectional data transmission.

[0043] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, downlink data may be associated with ultra-reliable low-latency communications. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first periodicity associated with a first set of decoding candidates within a first search space may be greater than a second periodicity associated with a second set of decoding candidates within a second search space.

[0044] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the second search space includes more decoding candidates in a monitoring opportunity than the first search space, the first search space and the second search space have an equal number of monitoring opportunities per time slot, or the second search space and the first search space include an equal number of decoding candidates in a monitoring opportunity, the second search space has more monitoring opportunities per time slot than the first search space, or a combination thereof. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the command to activate the second search space includes 2 bits. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1

[0013] An example of a system for wireless communication that supports search space activation for channel monitoring in accordance with various aspects of the present disclosure is shown.

[0046] Figure 2 An example of a wireless communication system supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0047] Figure 3 An example of a search space supporting search space activation for channel monitoring according to various aspects of the present disclosure is shown.

[0048] Figure 4 An example of a search space supporting search space activation for channel monitoring according to various aspects of the present disclosure is shown.

[0049] Figure 5 An example of a process flow to support search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0050] Figure 6 and 7 A block diagram of a device supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0051] Figure 8 A block diagram of a communications manager supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0052] Fig. 9A diagram of a system including a device supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0053] Fig.10 and 11 A block diagram of a device supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0054] Fig.12 A block diagram of a communications manager supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0055] Fig.13 A diagram of a system including a device supporting search space activation for channel monitoring is shown in accordance with various aspects of the present disclosure.

[0056] Figures 14 to 17 A flow chart of a method for supporting search space activation for channel monitoring according to various aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0057] In some wireless communication systems, a base station may send control information to a user equipment (UE) or a group of UEs. The UE may use the information, which may include downlink control information (DCI), to support communications with the base station. The base station may use one or more decoding candidates at aggregation levels to configure a search space set for these DCI transmissions. When configuring the search space set, the base station may determine a control resource set (CORESET) containing the search space set. The CORESET may include multiple control channel elements (CCEs), and the search space set may be mapped to a CCE space corresponding to a subset of the CCEs of the CORESET. The base station may identify the decoding candidates to be allocated to the search space set at each aggregation level, and may specify a position for the decoding candidates within the CCE space, for example, according to a hash function. The UE may identify the search space set configuration and may monitor the CCEs corresponding to the hashed decoding candidates for any DCI transmission from the base station.

[0058] In some cases, the base station and the UE can support ultra-reliable low-latency communication services. That is, the base station and the UE can support low-latency and high-reliability data transmission. In such a communication system, the UE can be configured to periodically monitor a search space with a high-density monitoring opportunity. In some cases, the UE can monitor a search space with a low-density monitoring opportunity, and can switch to a search space with a high-density monitoring opportunity based on an indication received from the base station. For example, the base station can identify a downlink data packet for the UE, and can schedule the downlink transmission of the data packet during subsequent transmissions. In this case, based on the receipt of downlink data, the base station can configure a high-density monitoring opportunity for the UE. According to one or more aspects of the present disclosure, the base station can send an indication to the UE, the indication including a command to switch a search space set to monitor a different number of opportunities (e.g., more opportunities) or a different number of candidates (e.g., a larger number of candidates).

[0059] In some cases, the base station may implement a first search space having fewer decoding candidates than a second search space. In some cases, based on decoding a received signal (such as a DCI), the UE may begin monitoring a second set of decoding candidates within the second search space. In some cases, the second search space and the first search space may be associated with the same CORESET. In some cases, the second search space and the first search space may be associated with different CORESETs. In some cases, the UE may stop monitoring the decoding candidates of the first search space and may monitor the decoding candidates of the second search space. In one example, the UE may send a message confirming a signal received in the first search space. For example, the message may include a confirmation of successful decoding of a DCI received in the first search space. After sending the confirmation message, the UE may stop monitoring the first search space and may begin monitoring the second search space.

[0060] In some cases, the UE may monitor the first search space and the second search space simultaneously. In some cases, the UE may monitor the first search space and the second search space simultaneously for a threshold duration, and may stop monitoring the first search space based on expiration of the threshold duration. In some cases, the base station may send a release command to the UE, and the UE may stop monitoring the first search space based on receiving the release command and continue monitoring the second search space.

[0061] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described through apparatus diagrams, system diagrams, and flow charts related to search space activation for channel monitoring.

[0062] Figure 1An example of a wireless communication system 100 supporting search space activation for channel monitoring according to various aspects of the present disclosure is shown. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 can be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 can support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices.

[0063] The base station 105 can communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (all of which may be referred to as a gNB), a home NodeB, a home eNodeB, or some other suitable term. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network equipment, including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.

[0064] Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communications coverage for a respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include uplink transmissions from the UE 115 to the base station 105, or downlink transmissions from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may be referred to as reverse link transmissions.

[0065] The geographic coverage area 110 for the base station 105 can be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macro cell, a small cell, a hotspot, or other types of cells, or various combinations thereof. In some examples, the base station 105 can be mobile and thus provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for respective geographic coverage areas 110.

[0066] The term "cell" refers to a logical communication entity for communicating with a base station 105 (e.g., via a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)) for distinguishing adjacent cells operating via the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), etc.). In some cases, the term "cell" may refer to a portion (e.g., a sector) of a geographic coverage area 110 on which the logical entity operates.

[0067] UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which can be implemented in appliances, vehicles, meters, or the like.

[0068] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automatic communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from a device that integrates sensors or meters to measure or capture information and forward the information to a central server or application that may utilize the information or present the information to a human interacting with the program or application. Some UEs 115 may be designed to collect information or implement automatic behavior of a machine. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based service charging.

[0069] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power-saving "deep sleep" mode when not engaged in active communications, or operating over limited bandwidth (e.g., based on narrowband communications). In some cases, UE 115 may be designed to support functions (e.g., mission-critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0070] In some cases, a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a point-to-point (P2P) or device-to-device (D2D) protocol). One or more UEs in a group of UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without the involvement of the base station 105.

[0071] The base stations 105 may communicate with the core network 130 and may communicate with each other. For example, the base stations 105 may be connected to the core network 130 via a backhaul link 132 (e.g., via S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) via a backhaul link 134 (e.g., via X2, Xn, or other interface).

[0072] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions, such as mobility, authentication, and bearer management, of the UE 115 served by the base station 105 associated with the EPC. User IP packets may be transmitted through the S-GW, which itself may be coupled to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be coupled to the IP services of the network operator. The operator's IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet switched (PS) streaming service.

[0073] At least some network devices, such as base stations 105, may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through several other access network transmission entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). In some examples, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or merged into a single network device (e.g., base station 105).

[0074] The wireless communication system 100 can operate using one or more frequency bands typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). For example, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. Buildings and environmental features may block or redirect UHF waves. However, the waves can penetrate the structure sufficiently so that the macrocell provides service to the UE 115 located indoors. Transmission of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0075] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using a frequency band of 3 GHz to 30 GHz, also known as the centimeter band. The SHF region includes the 5 GHz Industrial, Scientific and Medical (ISM) band, which may be used by devices that can tolerate interference from other users.

[0076] The wireless communication system 100 can also operate in the extremely high frequency (EHF) region of the spectrum (e.g., 30 GHz to 300 GHz), which is also referred to as the millimeter band. In some examples, the wireless communication system 100 can support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be even smaller and more closely spaced than the UHF antennas. In some cases, this may be conducive to the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may experience greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein can be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary from country to country or regulatory agency.

[0077] In some cases, the wireless communication system 100 can utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can use license assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5GHz ISM band. When operating in an unlicensed radio spectrum band, wireless devices such as base stations 105 and UE 115 can use a listen-before-send (LBT) procedure to ensure that the frequency channel is clear before sending data. In some cases, operations in unlicensed bands can be based on a combination of carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, point-to-point transmissions, or a combination thereof. Duplexing in unlicensed spectrum can be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0078] In some examples, the base station 105 or UE 115 may be equipped with multiple antennas, which may employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, multiple signals may be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO) that sends multiple spatial layers to the same receiving device, and multi-user MIMO (MU-MIMO) that sends multiple spatial layers to multiple devices.

[0079] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals conveyed via antenna elements of an antenna array so that signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying some amplitude and phase offsets to the signals carried via each of the antenna elements associated with the device. The adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0080] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions, which may include signals sent according to different beamforming weight sets and related to different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as the UE 115) a beam direction for subsequent transmission and / or reception by the base station 105.

[0081] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on signals transmitted in different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signal it received with the highest signal quality or otherwise acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0082] A receiving device (e.g., UE 115, which may be an example of a millimeter wave receiving device) may attempt multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may attempt multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, according to different receive beams or receive directions, any of which may be referred to as "listening." In some examples, the receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving data signals). The single receive beam may be aligned in a beam direction determined based on listening according to different receive beam directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio, or other acceptable signal quality based on listening according to multiple beam directions).

[0083] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located within an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array with several rows and columns of antenna ports so that the base station 105 can use the antenna ports to support beamforming for communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0084] In some cases, the wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The media access control (MAC) layer may perform priority processing and multiplex logical channels as transmission channels. The MAC layer may also provide retransmission at the MAC layer using hybrid automatic repeat request (HARQ) to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 that supports a radio bearer for user plane data. At the physical layer, a transmission channel may be mapped to a physical channel.

[0085] In some cases, UE 115 and base station 105 can support retransmission of data to increase the possibility of successfully receiving data. HARQ feedback is a technique that increases the possibility of correctly receiving data through communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput at the MAC layer under poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device can support HARQ feedback for the same time slot, wherein the device can provide HARQ feedback for data received in the previous symbol in the time slot in a specific time slot. In other cases, the device can provide HARQ feedback in a subsequent time slot or according to some other time intervals.

[0086] The time interval in LTE or NR can be expressed as a multiple of the basic time unit. For example, the basic time unit can refer to T s =1 / 30,720,000 second sampling period. The time interval of the communication resources can be organized according to the radio frame, each radio frame has a duration of 10 milliseconds (ms), where the frame period can be expressed as T f =307,200T s . A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may contain 10 subframes, numbered 0 to 9, and the duration of each subframe may be 1 millisecond. A subframe may be further divided into 2 slots, each of which has a duration of 0.5 milliseconds, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In addition to the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmit time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst transmission of a shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0087] In some wireless communication systems, a time slot may be further divided into a plurality of mini-slots containing one or more symbols. In some cases, a symbol of a mini-slot or a mini-slot may be the smallest scheduling unit. For example, the duration of each symbol may vary depending on the subcarrier spacing or the operating frequency band. Further, some wireless communication systems may implement time slot aggregation, where multiple time slots or mini-slots are aggregated together and used for communication between UE 115 and base station 105.

[0088] The term "carrier" refers to a set of radio spectrum resources with a defined physical layer structure for supporting communications over the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster for discovery by a UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (OFDM) (DFT-S-OFDM)).

[0089] The organization structure of the carrier may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR). For example, communications on a carrier may be organized according to TTIs or time slots, each of which may include user data and control information or signaling to support decoding of the user data. A carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0090] Physical channels may be multiplexed on a carrier according to various techniques. For example, a physical control channel and a physical data channel may be multiplexed on a downlink carrier using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. In some examples, control information sent in a physical control channel may be distributed between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) in a cascaded manner.

[0091] A carrier may be associated with a particular bandwidth of the radio spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0092] In a system using MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period is inversely proportional to the subcarrier spacing. The number of bits carried by each resource element depends on the modulation scheme (e.g., the order of the modulation scheme). Therefore, if the UE 115 receives more resource elements and the modulation scheme has a higher order, the data rate of the UE 115 can be higher. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate for communicating with the UE 115.

[0093] A device (e.g., base station 105 or UE 115) of wireless communication system 100 may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configured to support communication on one of a set of carrier bandwidths. In some examples, wireless communication system 100 may include base station 105 and / or UE 115 that supports simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0094] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both FDD and TDD component carriers.

[0095] In some cases, the wireless communication system 100 can utilize an enhanced component carrier (eCC). An eCC may have one or more characteristics, including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in an unlicensed spectrum or a shared spectrum (e.g., in which case multiple operators are allowed to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be utilized by a UE 115 that is not able to monitor the entire carrier bandwidth or is otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0096] In some cases, an eCC may utilize a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of other component carriers. A shorter symbol duration may be associated with an increased spacing between adjacent subcarriers. A device utilizing an eCC (e.g., a UE 115 or a base station 105) may transmit a wideband signal (e.g., based on a frequency channel or carrier bandwidth of 20, 40, 60, 80 MHz, etc.) at a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may contain one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0097] The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, etc. The flexibility of eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectrums. In some examples, NR shared spectrum may improve spectrum utilization and spectrum efficiency, particularly through dynamic vertical (e.g., in the frequency domain) and horizontal (e.g., in the time domain) resource sharing.

[0098] According to one or more aspects of the present disclosure, UE 115 may monitor a first set of decoding candidates within a first search space for receiving a physical downlink control channel message. Base station 105 may identify downlink data for UE 115 and may send a signal to UE 115 within the first search space. UE 115 may then receive a signal from base station 105 within the first search space, the signal including a command for activating a second search space. Based on receiving the signal, UE 115 may monitor a second set of decoding candidates within the second search space, and communicate with the base station based on monitoring the first set of decoding candidates in the first search space and / or the second set of decoding candidates in the second search space.

[0099] Figure 2An example of a wireless communication system 200 that supports search space activation for channel monitoring according to various aspects of the present disclosure is shown. The wireless communication system 200 may include a base station 105-a and a UE 115-a, which may be examples of a base station 105 and a UE 115, and may be described above with reference to Figure 1 As described. The base station 105-a can provide network coverage for the geographic coverage area 110-a. The base station 105-a can communicate with the UE 115-a on the downlink 205. For example, the base station 105-a can send DCI 220 to the UE 115-a in a first search space set 210 of a control channel (e.g., a physical downlink control channel), a second search space set 215 of the control channel, or both. In some cases, the first search space set can be referred to as search space A, and the second search space set can be referred to as search space B. In some cases, the base station 105-a can implement multiple first search space sets 210, second search space sets 215, or a combination thereof. The UE 115-a can communicate with the base station 105-a based on the received DCI 220.

[0100] In some wireless communication systems 200 (e.g., NR systems), a base station 105-a may configure a search space set for sending control information (e.g., DCI 220) to a UE 115-a. As discussed herein, a search space set may refer to a plurality of decoding candidates across one or more aggregation levels, which are configured for the transmission of control information. The search space set may be contained within a group of resources called a CORESET (e.g., each bandwidth part), which may be identified based on a CORESET identifier. Additionally or alternatively, a CORESET may refer to any resource used for control information transmission within a given TTI (e.g., a time slot). A CORESET may span multiple resource blocks in the frequency domain and may span multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain. A CORESET may be divided into multiple CCEs, which in some cases may be the smallest resource unit for transmitting control information. In some cases, a first search space set and a second search space set may be associated with different numbers of DCI formats and / or sizes.

[0101] Each CCE may have multiple resource elements and may be mapped to physical resources occupying other physical channels or reference signals transmitted in a CORESET. Each aggregation level may correspond to the number of CCEs allocated for a single DCI 220 candidate in that aggregation level. For example, aggregation level four may indicate that control information for that aggregation level is transmitted in multiples of four CCEs of a CORESET. This control information included within four CCE length segments may be referred to as decoding candidates, search space candidates, or simply candidates. In some cases, a decoding candidate or a CCE containing a decoding candidate for a given aggregation level may be referred to as a search space, and a combination of search spaces (e.g., a combination of decoding candidates or CCEs across aggregation levels) may be referred to as a search space set.

[0102] According to one or more aspects of the present disclosure, UE 115-a may be configured with up to three CORESETs per bandwidth part (BWP). Each CORESET may be configured with up to three symbols. In the wireless communication system 200, each CORESET may be associated with multiple search space sets. According to one example, UE 115-a may be configured with up to ten search space sets in a BWP. In some cases, each search space set (such as a first search space set 210 and a second search space set 215) may be configured with a radio network temporary identifier (RNTI), a DCI format, an aggregation level, an aggregation length, a search space type, a period and a slot offset in the period, and a 14-bit sequence for monitoring. According to one example, if a CORSET includes two symbols, the search space set may be configured to be monitored on symbols 2-3 and 5-6 and 9-10. That is, each monitoring opportunity of the search space set may include two symbols. In some cases, the same opportunity may be configured to monitor a search space set for every Z time slots, where Z is the search space set period.

[0103] Base stations 105-a and UEs 115-a supporting ultra-reliable low-latency communication services may additionally or alternatively support low-latency and high-reliability data transmission. In such a communication system, the base station 105-a may identify downlink data packets for the UE 115-a and may schedule downlink transmission of the data packets during the next transmission. In such a system, the base station 105-a may be configured to schedule data packets with low latency to accommodate multiple retransmission opportunities. Scheduling downlink transmission of data packets in an ultra-reliable low-latency communication system ensures that reliability requirements are met while keeping system efficiency unchanged.

[0104] In order to schedule data transmission in ultra-reliable low-latency communication, the base station 105-a can configure high-density monitoring opportunities for the UE 115-a. Additionally or alternatively, the UE 115-a can be configured with low-density monitoring opportunities during power saving mode, and with high-density monitoring opportunities during data transmission with a higher data rate. In some cases, if the UE 115-a is not configured with an uplink transmission authorization, the uplink transmission can be based on a scheduling request. In this case, when there is data for uplink transmission at the UE 115-a and the UE 115-a has no available uplink resources, the UE 115-a can send a scheduling request for resources. For example, when there is no uplink data or no undecided confirmation process, the UE 115-a may not monitor the uplink DCI.

[0105] In a downlink scenario, UE 115-a may not know that downlink data has arrived, and therefore may monitor a downlink channel with a large number of candidates. In some cases, UE 115-a may continuously monitor the downlink channel during discontinuous reception (DRX) on the cycle of UE 115-a. In conventional systems, the ability to monitor high-density monitoring opportunities with a large number of candidates may increase the complexity and power consumption of the UE. However, ultra-reliable low-latency communication services may be associated with bursty traffic. In some examples, ultra-reliable low-latency communication services may be associated with high-priority channels. In a communication system that supports reliable low-latency communication services and high-priority channels, according to one or more aspects of the present disclosure, UE115-a may be configured to monitor a search space set with high density and a large number of candidates when there is data for UE 115-a. That is, in order to reduce the workload, base station 105-a may send an indication to UE 115-a when data arrives at base station 105-a. As an example, the base station 105-a may instruct or command the UE 115-a to switch the search space set to monitor more opportunities or more candidates.

[0106] In some cases, the base station 105-a may implement one or more search space sets 215 on a channel to support more decoding candidates than the multiple decoding candidates in one or more search space sets 210. For example, a second search space set 215 (such as search space B) may include more decoding candidates in a monitoring opportunity than a first search space set 210 (such as search space A), where the first search space set 210 and the second search space set 215 have an equal number of monitoring opportunities in each time slot. Additionally or alternatively, the second search space set 215 and the first search space set 210 may include an equal number of decoding candidates in each monitoring opportunity, where the second search space set 215 has more monitoring opportunities in each time slot than the first search space set 210. In some cases, the second search space set 215 and the first search space set 210 may be associated with the same CORESET. In some cases, the second search space set 215 and the first search space set 210 may be associated with different CORESETs.

[0107] In some cases, the base station 105-a may send DCI 220 (such as a signal including the DCI) on a control channel within decoding candidates for different aggregation levels. The UE 115-a may monitor the search space set of the control channel for the decoding candidates and may detect and decode any DCI 220 sent in these decoding candidates. In some cases, the base station 105-a may send an indication of the search space set configuration to the UE 115-a, and the UE 115-a may determine how to monitor the channel based on the search space set configuration.

[0108] In other cases, UE 115-a may determine the search space set configuration based on received information, implicit signaling, or UE configuration. UE 115-a may receive and decode DCI 220 by monitoring according to the search space set configuration. In some examples, UE 115-a may determine UE-specific control information from DCI 220 based on RNTI and parity check. For example, UE 115-a may attempt to decode a decoding candidate using a UE-specific RNTI for UE 115-a, and may perform a parity check on the decoded bits. If the decoded bits pass a parity check (e.g., CRC), UE 115-a may determine that the decoded bits correspond to control information of UE 115-a.

[0109] In some cases, based on decoding DCI 220, UE 115-a may begin monitoring a first set of decoding candidates within a first search space set 210 (such as search space A) for receiving a physical downlink control channel message. Base station 105-a may identify that the downlink data of UE 115-a is high priority data, such as ultra-reliable low-latency communication data, and may send a command to activate a second search space set 215. In some cases, UE 115-a may receive an activation message in a media access layer control. For example, UE 115-a may receive DCI 220 on a first search space set 210, and may then receive a media access layer control element for a downlink channel. The media access layer control element may indicate activation of the second search space set 215. In some cases, the first search space set 210 (such as search space A) may include fewer decoding candidates than the second search space set 215 (such as search space B). UE 115-a may receive a signal, such as DCI 220, within first search space set 210 and may determine that the signal includes a command to activate a second search space. Based on decoding DCI 220, UE 115-a may begin monitoring a second set of decoding candidates within the second search space.

[0110] In some cases, UE 115-a may stop monitoring decoding candidates of first search space set 210 (e.g., deactivate first search space set 210) and may monitor decoding candidates of second search space set 215 (e.g., monitor decoding candidates 215 of second search space set). In one example, base station 105-a may send an activation command, but UE 115-a may not receive the command. To address this issue, in some cases, UE 115-a may send a message confirming a signal received within first search space set 210.

[0111] For example, the message may include an acknowledgment of successful decoding of DCI 220 received in a first search space set 210 (such as search space A). In some cases, the message may include a HARQ-acknowledgment associated with a physical downlink shared channel scheduled by DCI 220. After sending the message, UE 115-a may stop monitoring the first search space set 210 and may start monitoring the second search space set 215 (such as search space B). In some cases, base station 105-a may not receive the message of the acknowledgment signal and may continue to transmit on the first search space set 210. In such a case, UE 115-a may monitor the first search space set 210 (such as search space A) and the second search space set 215 (such as search space B) at the same time. In some cases, base station 105-a may send a release command to UE 115-a. In some cases, the UE may receive the release command in a media access layer control element. For example, the UE may receive DCI 220 on the second search space set 215 and may then receive the release command in a media access layer control element of the downlink channel. Based on receiving the release command, UE 115-a may stop monitoring the first set of search spaces 210 (such as search space A) and monitor the second set of search spaces 215 (such as search space B). That is, UE 115-a may deactivate the first set of search spaces 210 and activate the second set of search spaces 215.

[0112] In some cases, the UE 115-a may identify an index value for the location of the DCI 220. The UE 115-a may determine one or more monitoring opportunities for the second search space set 215 based on the index value for the location. For example, the one or more monitoring opportunities may be a function of the index value for the location at which the DCI 220 is received. The UE 115-a may then monitor the second search space set 215 based on the determined monitoring opportunities. In some cases, the UE 115-a may identify a bitmap included in the DCI 220 and may determine one or more monitoring opportunities for the second search space set 215 based on the bitmap. In some cases, the bitmap may include 14 bits.

[0113] According to one or more aspects of the present disclosure, UE 115-a may initialize a timer associated with the second search space set 215. That is, when UE 115-a receives an activation command, UE 115-a may initialize the timer. In some cases, when UE 115-a receives a second DCI 220 on the second search space set 215, the timer may be set (e.g., reset). In some cases, UE 115-a may receive a release command while monitoring the second search space set 215. Based on receiving the release command, UE 115-a may stop monitoring the second search space set 215 and start or continue monitoring the first search space set 210. In some cases, while monitoring the second search space set 215, UE 115-a may receive an indication of a second signal associated with the reception of downlink data within the first search space set 210. Based on receiving the second signal, UE 115-a may stop monitoring the second search space set 215 and continue monitoring the first search space set 210.

[0114] In some cases, UE 115-a may send a schedule for an upcoming uplink transmission and may switch from monitoring the first search space set 210 to monitoring the second search space set 215. However, if base station 105-a fails to receive the scheduling request, base station 105-a may continue to transmit on the first search space set 210, and UE 115-a may be mis-aligned with base station 105-a. To address this situation, UE 115-a may be configured to continue monitoring the first search space set 210 and the second search space set 215 based on sending the scheduling request. If UE 115-a receives downlink data on the second search space set 215, UE 115-a may avoid monitoring the first search space set 210 based on the data.

[0115] In some cases, base station 105-a may configure multiple types of second search space sets 215 (such as search space B) for UE 115-a. For example, base station 105-a may configure a first type of second search space set (such as search space B1) and a second type of second search space set (such as search space B2) for UE 115-a. In some cases, the second type of second search space set (such as search space B2) may have more decoding candidates than the first type of second search space set (such as search space B1). If base station 105-a determines that there is data in one direction, base station 105-a may activate the first type of second search space set (such as search space B1).

[0116] For example, base station 105-a may send DCI 220 on a first search space set 210 (such as search space A) to activate a second search space set of a first type (such as search space B1). In the event that base station 105-a determines that data is present in both directions, base station 105-a may activate a second search space set of a second type (such as search space B2). For example, base station 105-a may send DCI 220 on a first search space set 210 (such as search space A) or a second search space set of a first type (such as search space B1) to activate a second search space set of a second type (such as search space B2).

[0117] A release indication of a first search space set 210 (such as search space A) or a second search space set 215 of a different type (such as search space B1 and search space B2) may be based on a timer or a DCI. According to one example, if the UE monitors a second search space set of a second type (such as search space B2), the UE 115-a may receive a release command from the base station 105-a. The release command may include an option to revert to monitoring a second search space set of a first type (such as search space B1) or the first search space set 210 (such as search space A). In the absence of a release command, if the UE 115-a monitors a second search space set of a second type (such as search space B2) and does not receive a DCI in the second search space set of a second type (such as search space B2) within a predefined amount of time, the UE 115-a may revert to monitoring a second search space set of a first type (such as search space B1) or the first search space set 210 (such as search space A).

[0118] In one example, if UE 115-a stops monitoring (such as deactivating) a second search space set of a second type (such as search space B2) and reverts to monitoring a second search space set of a first type (such as search space B1), UE 115-a may initialize a timer. Based on the expiration of the timer, UE 115-a may stop monitoring (such as deactivating) a second search space set of a first type (such as search space B1) and may revert to monitoring a first search space set 210 (such as search space A). In some examples, the UE may revert to monitoring a second search space set of a first type (such as search space B1) upon expiration of a first timer and may revert to monitoring a first search space set 210 (such as search space A) upon expiration of a second timer. In such an example, the first timer may be different from the second timer.

[0119] Figure 3An example of a search space 300 supporting search space activation for channel monitoring in accordance with various aspects of the present disclosure is shown. In some examples, the search space 300 can implement aspects of the wireless communication system 100 and the wireless communication system 200. In the depicted example, the search space 300 can correspond to time and frequency resources and can be divided into monitoring opportunities for two search spaces, such as monitoring opportunities for search space A 310 and monitoring opportunities for search space B 315. Although depicted as having two search spaces (such as search space A and search space B), in some cases the search space 300 can include more search spaces (e.g., three or more).

[0120] Search spaces such as search space A 310 and search space B 315 may include a set of decoding candidates that may be configured for a UE (or shared by multiple UEs). Across different UEs, the search spaces may overlap at least partially in some cases (e.g., share some CCEs). A base station (such as base station 105) may notify a UE (such as UE 115) of the arrangement of the decoding candidates (e.g., which CCEs correspond to which decoding candidates), and send a control message using one or more selected CCEs. The UE may attempt to decode the CCEs corresponding to the decoding candidates to receive the control message.

[0121] In some cases, the base station may send information (e.g., in a master information block, a system information block, etc.) to inform the UE of the decoding candidate arrangement it uses. In some cases, the decoding candidate structure may indicate which CCEs within a CORESET correspond to specific aggregation level decoding candidates. Each decoding candidate may correspond to a specific CCE or a group of CCEs within a CORESET. The UE may use the decoding candidate structure to identify where within the search space of its CORESET and at which aggregation levels to perform decoding. In the depicted example, a UE (such as UE 115) may be configured to monitor a first set of decoding candidates for a first search space (such as search space A310).

[0122] For example, the UE may be configured to monitor one or more monitoring opportunities of a first search space, such as search space A. The base station may identify that downlink data 305 for the UE has arrived. In some cases, the downlink data 305 may be high priority data, such as data associated with ultra-reliable low-latency communications. Based on identifying the downlink data 305, the base station may send an indication 320 to the UE, which may include a command to switch the search space set to monitor more opportunities or more candidates. Figure 3 In the example of , the indication 320 is included in the DCI. When the UE monitors the first search space 310, the base station may send a DCI including a command to switch the search space during the monitoring occasion.

[0123] like Figure 3 As shown, the second search space 315 (such as search space B) includes more monitoring opportunities than the first search space 310 (such as search space A). In some cases, the second search space 315 (such as search space B) can include more decoding candidates in the monitoring opportunities than the first search space 310 (such as search space A), where the first search space 310 and the second search space 315 have an equal number of monitoring opportunities in each time slot. In some cases, the second search space 315 and the first search space 310 can be associated with the same CORESET. In some cases, the second search space 315 and the first search space 310 can be associated with different CORESETs. In some cases, the second search space 315 and the first search space 310 can include an equal number of decoding candidates in each monitoring opportunity, and the second search space 315 has more monitoring opportunities in each time slot than the first search space 310.

[0124] The UE may receive the DCI and an indication to switch the search space set and may activate 325 a second search space 315, such as search space B. In some cases, based on decoding the DCI, the UE may begin monitoring a second set of decoding candidates within the second search space 315. In some cases, the UE 115-a may stop monitoring the first search space 310 for decoding candidates and may monitor during monitoring opportunities associated with the second search space 315.

[0125] Figure 4 An example of a search space 400 supporting search space activation for channel monitoring in accordance with various aspects of the present disclosure is shown. In some examples, the search space 400 can implement aspects of the wireless communication system 100 and the wireless communication system 200. In the depicted example, the search space 400 can correspond to time and frequency resources and can be divided into monitoring opportunities for multiple search spaces, such as monitoring opportunities for search space A 410 and monitoring opportunities for search space B 415. Although depicted as having two search spaces (such as search space A and search space B), the search space 400 can include more search spaces.

[0126] As previously referenced Figure 3As described, the base station may identify downlink data 405 as available for the UE. In some cases, the downlink data 405 may be high priority data. In some cases, the downlink data 405 may be associated with ultra-reliable low-latency communications. Based on identifying the downlink data 405, the base station may send an indication 420 to the UE, and the indication may be or include a command to switch the search space set. In some cases, the base station may include the indication 420 in a DCI. The DCI including the command to switch the search space set may be sent during a monitoring opportunity when the UE monitors the first search space.

[0127] like Figure 4 As depicted, the second search space 415 (such as search space B) and the first search space 410 (such as search space A) include an equal number of monitoring opportunities. In some cases, in a monitoring opportunity, the second search space 415 (such as search space B) can include more decoding candidates than the first search space 410 (such as search space A), wherein the first search space 410 and the second search space 415 can have an equal number of monitoring opportunities in each time slot.

[0128] Based on receiving the DCI and the indication to switch the search space set 420, the UE may activate 425 a second search space 415, such as search space B. In some cases, based on decoding the DCI, the UE may begin monitoring a second set of decoding candidates within the second search space 415. In some cases, the UE may continue to monitor the first search space 410 for a threshold duration after receiving the signal.

[0129] For example, the UE may monitor the first search space 410 and the second search space 415 simultaneously for a threshold duration. The UE may then stop monitoring the first search space 410. In one example, the UE may send a message confirming the indication 420 received in the first search space 410. For example, the message may include a confirmation of successful decoding of the DCI and the indication 420 received in the first search space 410 (such as search space A). After sending the message, the UE may stop monitoring the first search space 410 and may start monitoring the second search space 415 (such as search space B). In some cases, the base station may send a release command (not shown) to the UE. Based on receiving the release command, the UE may stop monitoring the first search space 410 (such as search space A) and may monitor the second search space 415 (such as search space B).

[0130] Figure 5An example of a process flow 500 for supporting search space activation for channel monitoring according to various aspects of the present disclosure is shown. In some examples, the process flow 500 can implement aspects of the wireless communication system 100 and the wireless communication system 200. The base station 105-b and the UE 115-b can be reference Figure 1 and Figure 2 In some examples, process flow 500 may be implemented with reference to Figure 3 and Figure 4 Aspects or features of search space 300 and search space 400 are described.

[0131] In the following description of process flow 500, operations between UE 115-b and base station 105-b may be sent in an order different from the exemplary order shown. Operations performed by UE 115-b or base station 105-b may be performed in an order different from the exemplary order shown or at a different time. Some operations may also be omitted from process flow 500, or other operations may be added to process flow 500. In addition, base station 105-b and UE 115-b are not limiting, as the features described may be associated with any number of different devices.

[0132] At 505, UE 115-b may monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message. For example, UE 115-b may monitor decoding candidates of search space A. In some cases, the physical downlink control channel message may be associated with ultra-reliable low-latency communications.

[0133] At 510, base station 105-b may send a signal in the first search space. According to some examples, the signal may include a command to activate the second search space. In some cases, the signal may be included in a DCI. In some cases, the signal may include 2 bits.

[0134] At 515, UE 115-b may optionally send a message acknowledging a signal received within the first search space. For example, UE 115-b may decode the signal and may send an acknowledgment acknowledging successful decoding. In some cases, the message may include a HARQ-acknowledgment associated with a physical downlink shared channel scheduled by the signal.

[0135] At 520, UE 115-b may monitor a second set of decoding candidates within the second search space based on the received signal. In some cases, the monitoring may be based on the sent message. In some cases, a first periodicity associated with the first set of decoding candidates within the first search space may be greater than a second periodicity associated with the second set of decoding candidates within the second search space.

[0136] In some cases, the second search space may include more decoding candidates in the monitoring opportunity than the first search space, wherein the first search space and the second search space may have an equal number of monitoring opportunities in each time slot. Alternatively, the second search space and the first search space may include an equal number of decoding candidates in the monitoring opportunity, wherein the second search space has more monitoring opportunities in each time slot than the first search space.

[0137] At 525, base station 105-b may optionally send a second signal within the first search space. In some cases, the second signal may include a command to release the first search space. At 530, UE 115-b may stop monitoring the first set of decoding candidates within the first search space. In some cases, stopping monitoring the first set of decoding candidates within the first search space may be based on receiving the signal. In some cases, before stopping monitoring the first set of decoding candidates within the first search space, UE 115-b may simultaneously monitor the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0138] At 535 , UE 115 - b may communicate with base station 105 - b and / or other devices based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0139] The operations performed by the base station 105-b and the UE 115-b as part of, but not limited to, the process flow 500 may provide improvements to a communication link in a wireless communication system. In addition, the operations performed by the base station 105-b and the UE 115-b as part of, but not limited to, the process flow 500 may provide benefits and improvements to the operation of the UE 115-b while performing communications with high reliability and low latency. For example, the method described in the process flow 500 may support advantages such as search space activation for channel monitoring.

[0140] Figure 6 A block diagram 600 of a device 605 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0141] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to search space activation for channel monitoring, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Fig. 9 Examples of various aspects of the described transceiver 920. The receiver 610 may utilize a single antenna or a group of antennas.

[0142] The communication manager 615 may monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message, and may monitor a second set of decoding candidates within a second search space based on the received signal. The communication manager 615 may receive a signal from a base station within the first search space, the signal including a command for activating the second search space, and communicate with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0143] The communication manager 615 or its subcomponents may be implemented by hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0144] The communication manager 615 or its subcomponents can be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components disclosed herein, or combinations thereof.

[0145] The transmitter 620 can transmit signals generated by other components of the device 605. In some examples, the transmitter 620 can be collocated with the receiver 610 in a transceiver module. For example, the transmitter 620 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a group of antennas.

[0146] Figure 7 A block diagram 700 of a device 705 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 735. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0147] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to search space activation for channel monitoring, etc.). The information may be passed to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of various aspects of the described transceiver 920. The receiver 710 may utilize a single antenna or a group of antennas.

[0148] The communications manager 715 can be an example of aspects of the communications manager 615 as described herein. The communications manager 715 can include a monitoring component 720, a signal receiving component 725, and a communications component 730. The communications manager 715 can be an example of aspects of the communications manager 910 as described herein.

[0149] The monitoring component 720 can monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message, and monitor a second set of decoding candidates within a second search space based on the received signal. The signal receiving component 725 can receive a signal from a base station within the first search space, the signal including a command for activating the second search space. The communication component 730 can communicate with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0150] The transmitter 735 can transmit signals generated by other components of the device 705. In some examples, the transmitter 735 can be collocated with the receiver 710 in a transceiver module. For example, the transmitter 735 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 735 can utilize a single antenna or a group of antennas.

[0151] The actions performed by the communication manager 715 as described herein may be implemented to achieve one or more potential advantages. For example, in some examples, the communication manager 715 may reduce communication delays and improve channel throughput for high reliability communications. Improvements to the communication link (e.g., reducing communication delays and increasing reliability) may further save power and increase battery life at the UE 115 (e.g., by reducing complexity and retransmissions).

[0152] Figure 8 A block diagram 800 of a communication manager 805 supporting search space activation for channel monitoring in accordance with aspects of the present disclosure is shown. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a monitoring component 810, a signal receiving component 815, a communication component 820, an acknowledgment component 825, an index value component 830, a monitoring opportunity component 835, a bitmap component 840, a timer component 845, and a scheduling request component 850. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0153] The monitoring component 810 can monitor a first group of decoding candidates in the first search space to receive a physical downlink control channel message. In some examples, the monitoring component 810 can monitor a second group of decoding candidates in the second search space based on a received signal. In some cases, the physical downlink control channel message is associated with ultra-reliable low-latency communication. In some cases, a first periodicity associated with the first group of decoding candidates in the first search space is greater than a second periodicity associated with the second group of decoding candidates in the second search space.

[0154] In some examples, monitoring component 810 can simultaneously monitor a first set of decoding candidates within the first search space and a second set of decoding candidates within the second search space. In some examples, monitoring component 810 can monitor the first set of decoding candidates within the first search space for a threshold duration after receiving the signal, wherein monitoring the second set of decoding candidates within the second search space occurs after the threshold duration expires.

[0155] In some examples, the monitoring component 810 may stop monitoring the first set of decoding candidates within the first search space based on receiving a signal. In some examples, the monitoring component 810 may stop monitoring the second set of decoding candidates within the second search space based on expiration of a timer. In some examples, the monitoring component 810 may stop monitoring the second set of decoding candidates within the second search space based on receiving a second signal.

[0156] In some examples, the monitoring component 810 may monitor a third set of decoding candidates within a third search space based on receiving a second signal. In some examples, the monitoring component 810 may monitor a second set of decoding candidates within a second search space based on receiving a third signal. In some examples, the monitoring component 810 may monitor a first set of decoding candidates within a first search space based on receiving a third signal.

[0157] In some examples, the monitoring component 810 may monitor the second set of decoding candidates within the second search space based on the expiration of the first timer. In some examples, the monitoring component 810 may monitor the first set of decoding candidates within the first search space based on the expiration of the second timer. In some cases, the third set of decoding candidates within the third search space is greater than the second set of decoding candidates within the second search space. In some cases, one or more monitoring opportunities of the third search space are greater than one or more monitoring opportunities of the second search space. In some cases, the third set of decoding candidates within the third search space is associated with bidirectional data transmission.

[0158] In some cases, the second search space includes more decoding candidates in the monitoring opportunities than the first search space, the first search space and the second search space have an equal number of monitoring opportunities per time slot, or the second search space and the first search space include an equal number of decoding candidates in the monitoring opportunities, the second search space has more monitoring opportunities per time slot than the first search space, or a combination thereof.

[0159] The signal receiving component 815 can receive a signal in the first search space from the base station, the signal including a command for activating the second search space. In some cases, the signal includes a downlink control indicator. In some examples, the signal receiving component 815 can receive a second signal in the first search space from the base station, the second signal including a command for releasing the first search space, wherein monitoring the second group of decoding candidates in the second search space is based on receiving the second signal. In some cases, the second signal is included in the downlink control indicator. In some cases, the command for activating the second search space includes 2 bits.

[0160] In some examples, the signal receiving component 815 may receive a second signal associated with reception of downlink data within the second search space from the base station. In some examples, the signal receiving component 815 may receive a second signal from the base station within the second search space, the second signal comprising a command to release the second search space. In some examples, the signal receiving component 815 may receive a second signal associated with reception of downlink data within the first search space from the base station.

[0161] In some examples, the signal receiving component 815 may receive a second signal from the base station in the second search space, the second signal including a command for activating the third search space. In some examples, the signal receiving component 815 may receive a third signal from the base station in the third search space, the third signal including a command for releasing the third search space and reverting to the second search space. In some examples, the signal receiving component 815 may receive a third signal from the base station in the third search space, the third signal including a command for releasing the third search space and reverting to the first search space.

[0162] The communication component 820 can communicate with the base station based on monitoring the first set of decoding candidates in the first search space and the second set of decoding candidates in the second search space. The confirmation component 825 can send a message confirming the signal received in the first search space, wherein monitoring the second set of decoding candidates in the second search space is based on sending the message.

[0163] The index value component 830 may identify an index value of a location of a downlink control indicator.The monitoring opportunity component 835 may determine one or more monitoring opportunities of a second search space based on the index value of the location, wherein monitoring of a second set of decoding candidates is based on the one or more monitoring opportunities.

[0164] The bitmap component 840 can identify a bitmap included in the downlink control indicator. In some examples, the monitoring opportunity component 835 can determine one or more monitoring opportunities of the second search space based on the bitmap, wherein the monitoring of the second set of decoding candidates is based on one or more monitoring opportunities. In some cases, the bitmap includes 14 bits.

[0165] The timer component 845 may initialize a timer associated with the second search space based on receiving the signal, wherein monitoring a second set of decoding candidates within the second search space is based on the timer. In some examples, the timer component 845 may initialize a timer associated with the second search space based on receiving the signal. In some examples, the timer component 845 may reinitialize a timer associated with the second search space based on receiving the second signal, wherein monitoring a second set of decoding candidates within the second search space is based on the timer.

[0166] In some examples, the timer component 845 can initialize a first timer associated with the second search space based on receiving the second signal. In some examples, the timer component 845 can initialize a second timer associated with the second search space based on monitoring a second set of decoding candidates within the second search space.

[0167] The scheduling request component 850 can send a scheduling request for an upcoming uplink transmission to a base station, wherein monitoring the second set of decoding candidates within the second search space is based on sending the scheduling request.

[0168] Fig. 9 A diagram of a system 900 including a device 905 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The device 905 may be an example of, or include components of, the device 605, device 705, or UE 115 described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945).

[0169] The communication manager 910 may monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message, and may monitor a second set of decoding candidates within a second search space based on a received signal. The communication manager 910 may receive a signal from a base station within the first search space, the signal including a command for activating the second search space, and communicate with the base station based on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

[0170] The I / O controller 915 can manage the input and output signals of the device 905. The I / O controller 915 can also manage peripheral devices that are not integrated into the device 905. In some cases, the I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 915 can utilize an operating system, such as Or another well-known operating system. In other cases, the I / O controller 915 can represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 915 can be implemented as a part of a processor. In some cases, a user can interact with the device 905 via the I / O controller 915 or via hardware components controlled by the I / O controller 915.

[0171] As described herein, the transceiver 920 can communicate bidirectionally via one or more antennas, wired links, or wireless links. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from the antenna. In some cases, the wireless device may include a single antenna 925. However, in some cases, the device may have more than one antenna 925 that can simultaneously send or receive multiple wireless transmissions.

[0172] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may contain a basic input-output system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0173] The processor 940 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting search space activation for channel monitoring).

[0174] The code 935 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 935 may not be directly executed by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0175] Fig.10A block diagram 1000 of a device 1005 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The device 1005 can be an example of aspects of the base station 105 described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0176] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to search space activation for channel monitoring, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.13 Examples of various aspects of the described transceiver 1320. The receiver 1010 may utilize a single antenna or a group of antennas.

[0177] The communication manager 1015 can identify downlink data for a UE configured to monitor a first set of decoding candidates within a first search space, send a signal to the UE within the first search space based on the downlink data, the signal including a command for activating a second search space associated with a second set of decoding candidates, and communicate with the UE based on sending the signal within the first search space. The communication manager 1015 can be an example of aspects of the communication manager 1310 described herein.

[0178] The communication manager 1015 or its subcomponents may be implemented by hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0179] The communication manager 1015 or its subcomponents can be physically located in various locations, including being distributed so that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents can be combined with one or more other hardware components, including but not limited to I / O components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0180] The transmitter 1020 can transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 can be collocated with the receiver 1010 in a transceiver module. For example, the transmitter 1020 can be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1020 can utilize a single antenna or a group of antennas.

[0181] Fig.11 A block diagram 1100 of a device 1105 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The device 1105 can be an example of aspects of the device 1005 or base station 105 described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1135. The device 1105 may also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0182] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to search space activation for channel monitoring, etc.). The information may be passed to other components of the device 1105. The receiver 1110 may be a reference Fig.13 Examples of various aspects of the described transceiver 1320. The receiver 1110 may utilize a single antenna or a group of antennas.

[0183] The communication manager 1115 can be an example of aspects of the communication manager 1015 as described herein. The communication manager 1115 can include a data identification component 1120, a signaling component 1125, and a communication component 1130. The communication manager 1115 can be an example of aspects of the communication manager 1310 described herein.

[0184] The data identification component 1120 can identify downlink data for a UE configured to monitor a first set of decoding candidates in a first search space. The signal transmission component 1125 can send a signal to the UE in the first search space based on the downlink data, the signal including a command for activating a second search space associated with a second set of decoding candidates. The communication component 1130 can communicate with the UE based on sending the signal in the first search space.

[0185] The transmitter 1135 can transmit signals generated by other components of the device 1105. In some examples, the transmitter 1135 can be collocated with the receiver 1110 in a transceiver module. For example, the transmitter 1135 can be a reference Fig.13Examples of various aspects of the transceiver 1320 are described. The transmitter 1135 can utilize a single antenna or a group of antennas.

[0186] Fig.12 A block diagram 1200 of a communication manager 1205 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The communication manager 1205 can be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 can include a data identification component 1210, a signal transmission component 1215, a communication component 1220, a configuration component 1225, an acknowledgement reception component 1230, a timer component 1235, and a scheduling request component 1240. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0187] The data identification component 1210 can identify downlink data for a UE configured to monitor a first set of decoding candidates in a first search space. In some cases, the downlink data is associated with ultra-reliable low-latency communication. The signal transmission component 1215 can send a signal to the UE in the first search space based on the downlink data, the signal including a command for activating a second search space associated with a second set of decoding candidates.

[0188] In some examples, the signal sending component 1215 may send a second signal to the UE within the first search space, the second signal including a command for releasing the first search space. In some examples, the signal sending component 1215 may send a second signal associated with the transmission of downlink data within the second search space to the UE. In some cases, the signal includes a downlink control indicator. In some cases, the second signal is included in the downlink control indicator. In some cases, the command for activating the second search space includes 2 bits.

[0189] In some examples, the signal transmission component 1215 may transmit a second signal to the UE within the second search space, the second signal including a command for releasing the second search space. In some examples, the signal transmission component 1215 may transmit a second signal to the UE associated with the transmission of downlink data within the first search space. In some examples, the signal transmission component 1215 may transmit a second signal to the UE within the second search space, the second signal including a command for activating a third search space associated with a third group of decoding candidates.

[0190] In some examples, the signal sending component 1215 may send a third signal to the UE within the third search space, the third signal including a command for releasing the third search space and reverting to the second search space. In some examples, the signal sending component 1215 may send a third signal to the UE within the third search space, the third signal including a command for releasing the third search space and reverting to the first search space. In some cases, the third group of decoding candidates within the third search space is greater than the second group of decoding candidates within the second search space. In some cases, one or more monitoring opportunities of the third search space are greater than one or more monitoring opportunities of the second search space. In some cases, the third group of decoding candidates within the third search space is associated with bidirectional data transmission.

[0191] The communication component 1220 may communicate with the UE based on sending a signal in the first search space. The configuration component 1225 may configure the UE to monitor a second set of decoding candidates in the second search space based on the sent signal. In some examples, the configuration component 1225 may configure the UE to simultaneously monitor the first set of decoding candidates in the first search space and the second set of decoding candidates in the second search space. In some examples, the configuration component 1225 may configure the UE to monitor the first set of decoding candidates in the first search space within a threshold duration after sending the signal.

[0192] In some examples, the configuration component 1225 may configure the UE to monitor the second set of decoding candidates within the second search space after the threshold duration expires. In some examples, the configuration component 1225 may configure the UE to monitor the second set of decoding candidates within the second search space based on sending the second signal. In some examples, the configuration component 1225 may configure the UE to stop monitoring the first set of decoding candidates within the first search space based on sending the signal.

[0193] In some examples, the configuration component 1225 may configure the UE to monitor the second set of decoding candidates within the second search space based on a timer. In some examples, the configuration component 1225 may configure the UE to monitor the second set of decoding candidates within the second search space based on a timer. In some examples, the configuration component 1225 may configure the UE to stop monitoring the second set of decoding candidates within the second search space based on expiration of the timer.

[0194] In some examples, the configuration component 1225 may configure the UE to stop monitoring the second set of decoding candidates within the second search space based on sending the second signal. In some examples, the configuration component 1225 may configure the UE to monitor the second set of decoding candidates within the second search space based on receiving a scheduling request. In some examples, the configuration component 1225 may configure the UE to monitor the second set of decoding candidates within the second search space based on expiration of the first timer.

[0195] In some examples, the configuration component 1225 can configure the UE to monitor the first set of decoding candidates within the first search space based on the expiration of the second timer. In some cases, the first periodicity associated with the first set of decoding candidates within the first search space is greater than the second periodicity associated with the second set of decoding candidates within the second search space. In some cases, the second search space includes more decoding candidates in the monitoring opportunity than the first search space, the first search space and the second search space have an equal number of monitoring opportunities per time slot, or the second search space and the first search space include an equal number of decoding candidates in the monitoring opportunity, the second search space has more monitoring opportunities per time slot than the first search space, or a combination thereof.

[0196] The confirmation receiving component 1230 may receive a message from the UE confirming a signal sent in the first search space. The timer component 1235 may configure the UE to initialize a timer associated with the second search space based on the transmitted signal. In some examples, the timer component 1235 may configure the UE to initialize a timer associated with the second search space based on the transmitted signal. In some examples, the timer component 1235 may configure the UE to reinitialize a timer associated with the second search space based on sending a second signal.

[0197] In some examples, the timer component 1235 can configure the UE to initialize a first timer associated with the third search space based on sending a second signal. In some examples, the timer component 1235 can configure the UE to initialize a second timer associated with the second search space based on monitoring a second set of decoding candidates within the second search space. The scheduling request component 1240 can receive a scheduling request for uplink transmission from the UE.

[0198] Fig.13A diagram of a system 1300 including a device 1305 supporting search space activation for channel monitoring according to aspects of the present disclosure is shown. The device 1305 may be an example of or include components of the device 1005, device 1105, or base station 105 described herein. The device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may be in electronic communication via one or more buses (e.g., bus 1350).

[0199] The communication manager 1310 can identify downlink data for a UE configured to monitor a first group of decoding candidates within a first search space, send a signal within the first search space to the UE based on the downlink data, the signal including a command for activating a second search space associated with a second group of decoding candidates, and communicate with the UE based on sending the signal within the first search space.

[0200] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the delivery of data communications for client devices (eg, one or more UEs 115).

[0201] As described herein, the transceiver 1320 can communicate bidirectionally via one or more antennas, wired links, or wireless links. For example, the transceiver 1320 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1320 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from the antenna. In some cases, the wireless device can include a single antenna 1325. However, in some cases, the device can have more than one antenna 1325 that can simultaneously send or receive multiple wireless transmissions.

[0202] The memory 1330 may include RAM, ROM, or a combination thereof. The memory 1330 may store computer readable code 1335, which includes instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, the memory 1330 may include a BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0203] The processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into the processor 1340. The processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause the device 1305 to perform various functions (e.g., functions or tasks supporting search space activation for channel monitoring).

[0204] The inter-station communication manager 1345 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with UE 115 in collaboration with other base stations 105. For example, the inter-station communication manager 1345 can coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communication manager 1345 can provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0205] The code 1335 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1335 may not be directly executed by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0206] Fig.14 1400 is a flowchart of a method 1400 for supporting search space activation for channel monitoring according to various aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by reference to Figures 6 to 9 The communication manager described herein performs. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0207] At 1405, the UE may monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message. The operations of 1405 may be performed according to the methods described herein. In some examples, such as reference Figures 6 to 9 As described, various aspects of the operation of 1405 may be performed by the monitoring component.

[0208] At 1410, the UE may receive a signal from a base station in the first search space, the signal including a command to activate the second search space. In some cases, the UE may receive the activation message in a media access layer control element. For example, the UE may receive DCI on the first search space and then may receive a media access layer control element for a downlink channel. The media access layer control element may indicate activation of the second search space. The operations of 1410 may be performed according to the methods described herein. In some examples, as described in reference Figures 6 to 9 As described, aspects of the operation of 1410 may be performed by the signal receiving component.

[0209] At 1415, the UE may monitor a second set of decoding candidates within the second search space based on the received signal. The operation of 1415 may be performed according to the method described herein. In some examples, such as reference Figures 6 to 9 As described, various aspects of the operation of 1415 may be performed by the monitoring component.

[0210] At 1420, the UE may communicate with the base station based on monitoring the first set of decoding candidates in the first search space and the second set of decoding candidates in the second search space. The operation of 1420 may be performed according to the methods described herein. In some examples, such as reference Figures 6 to 9 As described, aspects of the operation of 1420 may be performed by the communication component.

[0211] Fig.15 1 is a flowchart of a method 1500 for supporting search space activation for channel monitoring according to aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by reference to Figures 6 to 9 The communication manager described herein performs. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0212] At 1505, the UE may monitor a first set of decoding candidates within a first search space to receive a physical downlink control channel message. The operations of 1505 may be performed according to the methods described herein. In some examples, such as reference Figures 6 to 9 As described, various aspects of the operation of 1505 may be performed by the monitoring component.

[0213] At 1510, the UE may receive a signal from a base station in a first search space, the signal including a command for activating a second search space. The operations of 1510 may be performed according to the methods described herein. In some examples, such as reference Figures 6 to 9 As described, aspects of the operation of 1510 may be performed by the signal receiving component.

[0214] At 1515, the UE may monitor a second set of decoding candidates within the second search space based on the received signal. The operation of 1515 may be performed according to the method described herein. In some examples, such as reference Figures 6 to 9 As described, various aspects of the operation of 1515 may be performed by the monitoring component.

[0215] At 1520, the UE may initialize a timer associated with the second search space based on the received signal. The operation of 1520 may be performed according to the method described herein. In some examples, such as reference Figures 6 to 9 As described, aspects of the operation of 1520 may be performed by a timer component.

[0216] At 1525, the UE may receive a second signal associated with reception of downlink data within the second search space from the base station. The operations of 1525 may be performed according to the methods described herein. In some examples, such as reference Figures 6 to 9 As described, aspects of the operation of 1525 may be performed by the signal receiving component.

[0217] At 1530, the UE may reinitialize a timer associated with the second search space based on receiving the second signal. In some cases, monitoring the second set of decoding candidates within the second search space is based on the timer. The operations of 1530 may be performed according to the methods described herein. In some examples, such as reference Figures 6 to 9 As described, aspects of the operation of 1530 may be performed by a timer component.

[0218] At 1535, the UE may communicate with the base station based on monitoring the first set of decoding candidates in the first search space and the second set of decoding candidates in the second search space. The operation of 1535 may be performed according to the method described herein. In some examples, such as reference Figures 6 to 9 As described, various aspects of the operation of 1535 may be performed by the communications component.

[0219] Fig.16 1 shows a flow chart of a method 1600 for supporting search space activation for channel monitoring according to aspects of the present disclosure. The operations of the method 1600 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by reference to Figures 10 to 13 The communication manager described herein is executed. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0220] At 1605, the base station may identify downlink data for a UE configured to monitor a first set of decoding candidates within a first search space. The operations of 1605 may be performed according to the methods described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1605 may be performed by the data identification component.

[0221] At 1610, the base station may send a signal to the UE in the first search space based on the downlink data, the signal including a command for activating a second search space associated with the second set of decoding candidates. The operation of 1610 may be performed according to the method described herein. In some examples, such as reference Figures 10 to 13 As described, aspects of the operation of 1610 may be performed by a signal sending component.

[0222] At 1615, the base station may communicate with the UE based on sending a signal within the first search space. The operation of 1615 may be performed according to the method described herein. In some examples, such as reference Figures 10 to 13 As described, aspects of the operation of 1615 may be performed by the communication component.

[0223] Fig.17 1 is a flowchart of a method 1700 for supporting search space activation for channel monitoring according to aspects of the present disclosure. The operations of the method 1700 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by reference to Figures 10 to 13 The communication manager described herein is executed. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0224] At 1705, the base station may identify downlink data for a UE configured to monitor a first set of decoding candidates within a first search space. The operations of 1705 may be performed according to the methods described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1705 may be performed by the data identification component.

[0225] At 1710, the base station may send a signal to the UE in the first search space based on the downlink data, the signal including a command for activating a second search space associated with the second set of decoding candidates. The operation of 1710 may be performed according to the method described herein. In some examples, such as reference Figures 10 to 13 As described, aspects of the operation of 1710 may be performed by a signal sending component.

[0226] At 1715, the base station may send a second signal to the UE within the second search space, the second signal including a command for activating a third search space associated with a third set of decoding candidates. The operation of 1715 may be performed according to the methods described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1715 may be performed by the signal sending component.

[0227] At 1720, the base station may configure the UE to initialize a first timer associated with the third search space based on sending the second signal. The operation of 1720 may be performed according to the method described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1720 may be performed by a timer component.

[0228] At 1725, the base station may configure the UE to monitor a second set of decoding candidates within the second search space based on the expiration of the first timer. The operation of 1725 may be performed according to the method described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1725 may be performed by the configuration component.

[0229] At 1730, the base station may configure the UE to initialize a second timer associated with the second search space based on monitoring of a second set of decoding candidates within the second search space. The operations of 1730 may be performed according to the methods described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1730 may be performed by a timer component.

[0230] At 1735, the base station may configure the UE to monitor the first set of decoding candidates within the first search space based on the expiration of the second timer. The operation of 1735 may be performed according to the method described herein. In some examples, such as reference Figures 10 to 13 As described, various aspects of the operation of 1735 may be performed by the configuration component.

[0231] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0232] The techniques described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems. A CDMA system can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000Releases are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other CDMA variants. A TDMA system can implement radio technologies such as Global System for Mobile Communications (GSM).

[0233] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are UMTS versions that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-APro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The technology described herein can be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although various aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in many of the descriptions, the techniques described herein may be applicable beyond LTE, LTE-A, LTE-A Pro, or NR applications.

[0234] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs with service subscriptions to a network provider. Small cells may be associated with lower-power base stations than macro cells, and small cells may operate in the same or different frequency bands (e.g., licensed, unlicensed, etc.) as macro cells. According to various examples, small cells may include pico cells, femto cells, and micro cells. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access to UEs with service subscriptions to a network provider. A femto cell may also cover a smaller geographic area (e.g., a home) and may provide restricted access to UEs associated with a femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0235] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be roughly aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0236] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0237] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0238] The functions described herein may be implemented by hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or sent via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0239] Computer-readable media include non-transitory computer storage media and communication media, and communication media include any media that helps to transfer a computer program from one place to another. Non-transitory storage media can be any available media that can be accessed by a general or special computer. As an example and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other non-transitory media that can be used to carry or store the required program code in the form of instructions or data structures and can be accessed by a general or special computer or a general or special processor. Moreover, any connection is appropriately referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) is used to send software from a website, server or other remote source, the definition of the medium includes coaxial cable, fiber optic cable, twisted pair, digital subscriber line or wireless technology such as infrared, radio and microwave. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0240] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items beginning with a phrase such as "at least one" or "one or more") means an inclusive list. Thus, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Moreover, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0241] In the drawings, similar parts or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that is used to distinguish between other similar components. If only the first reference label is used in the description, the description applies to any similar components having the same first reference label, regardless of the second or other subsequent reference labels.

[0242] The description described herein, in conjunction with the accompanying drawings, describes examples and does not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." In order to provide an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid making the concepts of the described examples unclear.

[0243] The descriptions described herein are provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: monitoring a first set of decoding candidates within a first search space to receive a physical downlink control channel message; receiving a signal from a base station in the first search space, the signal comprising a command for activating a second search space; monitoring a second set of decoding candidates within the second search space based at least in part on receiving the signal; as well as Communicating with the base station is performed based at least in part on monitoring the first set of decoding candidates within the first search space and the second set of decoding candidates within the second search space.

2. The method according to claim 1, further comprising: A message is sent acknowledging the signal received within the first search space, wherein monitoring the second set of decoding candidates within the second search space is based at least in part on sending the message.

3. The method according to claim 1, wherein: Monitoring the first set of decoding candidates within the first search space and monitoring the second set of decoding candidates within the second search space occur simultaneously.

4. The method according to claim 1, further comprising: The first set of decoding candidates within the first search space is monitored for a threshold duration after receiving the signal, wherein the second set of decoding candidates within the second search space is monitored after expiration of the threshold duration.

5. The method according to claim 1, further comprising: A second signal is received from the base station within the first search space, the second signal comprising a command to release the first search space, wherein monitoring the second set of decoding candidates within the second search space is based at least in part on receiving the second signal.

6. The method according to claim 1, further comprising: Monitoring the first set of decoding candidates within the first search space is stopped based at least in part on receiving the signal, wherein the signal includes a downlink control indicator.

7. The method according to claim 6, further comprising: an index value identifying a position of the downlink control indicator; as well as One or more monitoring occasions for the second search space are determined based at least in part on the index value of the position, wherein monitoring the second set of decoding candidates is based at least in part on the one or more monitoring occasions.

8. The method according to claim 6, further comprising: identifying a bitmap included in the downlink control indicator; as well as One or more monitoring opportunities for the second search space are determined based at least in part on the bitmap, wherein monitoring the second set of decoding candidates is based at least in part on the one or more monitoring opportunities.

9. The method according to claim 1, further comprising: A timer associated with the second search space is initialized based at least in part on receiving the signal, wherein monitoring the second set of decoding candidates within the second search space is based at least in part on the timer.

10. The method according to claim 1, further comprising: initializing a timer associated with the second search space based at least in part on receiving the signal; receiving, from the base station, a second signal associated with reception of downlink data within the second search space; as well as The timer associated with the second search space is reinitialized based at least in part on receiving the second signal, wherein monitoring the second set of decoding candidates within the second search space is based at least in part on the timer.

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