Semi-persistent scheduling for low latency communications

Abstract

To provide methods, systems, and devices for wireless communication.SOLUTION: A wireless communication device (base station 105-a) may establish a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for transmission of priority traffic, and determine that a level of priority traffic to transmit during a first TTI of the plurality of TTIs is below a priority traffic threshold. The wireless communication device may transmit a per-TTI release signal to indicate that the block of SPS resources in the first TTI is released from being reserved for priority traffic.SELECTED DRAWING: Figure 3

Description

cross reference

[0001]

[0001] This application claims priority to U.S. patent application Ser. No. 15 / 388,242 by Li et al., entitled "Semi-Persistent Scheduling for Low-Latency Communications," filed Dec. 22, 2016, and assigned to the present assignee. [Background technology]

[0002] The following relates generally to wireless communications, and more specifically to semi-persistent scheduling for low latency communications.

[0003]

[0003] Wireless communication systems have been widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasts, and the like. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems, (e.g., Long Term Evolution (LTE) systems, or New Radio (NR) systems). A wireless multiple-access communication system may include several base stations or access network nodes, each simultaneously supporting communication for multiple communication devices, which may also be known as user equipment (UE).

[0004]

[0004] Multiple types of traffic may be communicated in a wireless communication system. In some cases, different performance metrics of different types of traffic may cause some types of traffic to have higher priority than others. An example of a type of traffic in a wireless communication system may include ultra-reliability low-latency communications (URLLC), sometimes referred to as mission-critical communications, which may specify that packets are communicated with low latency and high reliability. URLLC or mission-critical communications may be an example of communications having high priority, or priority above a threshold. Low priority communications include communications having priority below a threshold. An example of communications having a lower priority level than that of URLLC or mission-critical communications includes enhanced mobile broadband (eMBB) communications. A wireless communication system may specify resources to be used for various types of communications, such as high priority or low priority traffic. Summary of the Invention

[0005]

[0005] The described techniques relate to improved methods, systems, devices, or apparatuses supporting semi-persistent scheduling (SPS) for low latency communications. In general, the described techniques provide for a per-transmission-time-interval (TTI) release of a block of SPS resources. Beneficially, communications automatically resume at the block of SPS resources in the next TTI unless another per-TTI release signal is received. Advantageously, these examples may meet the low latency and ultra-high reliability requirements for ultra-reliable low-latency communications (URLLC).

[0006] A method of wireless communications is described that may include establishing a block of SPS resources in each of a plurality of TTIs for transmission of prioritized traffic, determining that a level of the prioritized traffic to be transmitted during a first TTI of the plurality of TTIs falls below a priority traffic threshold, and transmitting a per-TTI release signal to indicate that the block of SPS resources in the first TTI is to be released from being reserved for the prioritized traffic.

[0007] An apparatus for wireless communications is described that may include means for establishing a block of SPS resources in each of a plurality of TTIs for transmission of prioritized traffic, means for determining that a level of prioritized traffic to be transmitted during a first TTI of the plurality of TTIs falls below a priority traffic threshold, and means for transmitting a per-TTI release signal to indicate that the block of SPS resources in the first TTI is to be released from being reserved for the prioritized traffic.

[0008] Another apparatus for wireless communications 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 operable to cause the processor to establish a block of SPS resources in each of a plurality of TTIs for transmission of prioritized traffic, determine that a level of prioritized traffic to be transmitted during a first TTI of the plurality of TTIs falls below a priority traffic threshold, and transmit a per-TTI release signal to indicate that the block of SPS resources in the first TTI is to be released from being reserved for the prioritized traffic.

[0009] A non-transitory computer-readable medium for wireless communications is described. The non-transitory computer-readable medium may include instructions operable to cause a processor to establish a block of SPS resources in each of a plurality of TTIs for transmission of prioritized traffic, determine that a level of prioritized traffic to be transmitted during a first TTI of the plurality of TTIs falls below a priority traffic threshold, and transmit a per-TTI release signal to indicate that the block of SPS resources in the first TTI is to be released from being reserved for the prioritized traffic.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instructions for refraining from transmitting priority traffic during the first TTI. Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instructions for transmitting lower priority traffic on the block of SPS resources in the first TTI.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instructions for determining that prioritized traffic may be available for transmission in a subsequent TTI of the multiple TTIs, the subsequent TTI occurring immediately after the first TTI. Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instructions for transmitting prioritized traffic in a block of SPS resources in the subsequent TTI.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described above, transmitting the per-TTI release signal comprises transmitting the per-TTI release signal in a first TTI, where the wireless node may be a base station and the prioritized traffic may be downlink prioritized traffic. In some examples of the methods, apparatus, and non-transitory computer-readable media described above, transmitting the per-TTI release signal comprises transmitting the per-TTI release signal in a second TTI of the plurality of TTIs, where the second TTI precedes the first TTI, where the wireless node may be a user equipment (UE), and the prioritized traffic may be uplink prioritized traffic.

[0013]

[0013] Some examples of the methods, devices, and non-transitory computer-readable media described above may further include a process, feature, means, or instruction for instructing the transmitter to enter a low power state during at least a portion of the first TTI. In some examples of the methods, devices, and non-transitory computer-readable media described above, each of the multiple TTIs includes a control channel that precedes the data channel in time. In some examples of the methods, devices, and non-transitory computer-readable media described above, transmitting a per-TTI release signal comprises transmitting a per-TTI release signal in the control channel of the first TTI.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable medium described above, transmitting the per-TTI release signal comprises transmitting the per-TTI release signal in a data channel of a preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI. In some examples of the methods, apparatus, and non-transitory computer-readable medium described above, the per-TTI release signal may be a single bit.

[0015] A method of wireless communication is described that may include establishing a block of SPS resources in each of a plurality of TTIs for reception of prioritized traffic, and receiving a per-TTI release signal indicating that the block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for the prioritized traffic.

[0016] An apparatus for wireless communication is described that may include means for establishing a block of SPS resources in each of a plurality of TTIs for reception of prioritized traffic, and means for receiving a per-TTI release signal indicating that a block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for the prioritized traffic.

[0017] Another apparatus for wireless communications 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 operable to cause the processor to establish a block of SPS resources in each of a plurality of TTIs for reception of prioritized traffic and to receive a per-TTI release signal indicating that the block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for the prioritized traffic.

[0018] A non-transitory computer-readable medium for wireless communications is described, which may include instructions operable to cause a processor to establish a block of SPS resources in each of a plurality of TTIs for reception of prioritized traffic, and to receive a per-TTI release signal indicating that a block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for the prioritized traffic.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instructions for releasing a block of SPS resources in the first TTI from being reserved for the priority traffic based at least in part on the per-TTI release signal. Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instructions for receiving lower priority traffic on the block of SPS resources in the first TTI.

[0020]

[0020] Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include a process, feature, means, or instruction for monitoring a subsequent TTI release signal to determine whether a block of SPS resources in a subsequent TTI of the multiple TTIs may be released from exclusive prioritized traffic use. In some examples of the method, apparatus, and non-transitory computer-readable medium described above, receiving a per-TTI release signal comprises receiving a per-TTI release signal in a first TTI, where the wireless node may be a user equipment (UE) and the prioritized traffic may be downlink prioritized traffic. In some examples of the method, apparatus, and non-transitory computer-readable medium described above, receiving a per-TTI release signal comprises receiving a per-TTI release signal in a second TTI of the multiple TTIs, where the second TTI precedes the first TTI, where the wireless node may be a base station and the prioritized traffic may be uplink prioritized traffic.

[0021]

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described above may further include a process, feature, means, or instruction for instructing the decoder to enter a low power state during at least a portion of the first TTI based at least in part on the per-TTI release signal. In some examples of the methods, apparatus, and non-transitory computer-readable media described above, each of the multiple TTIs includes a control channel that precedes the data channel in time.

[0022] In some examples of the methods, devices, and non-transitory computer-readable media described above, receiving the per-TTI release signal comprises receiving the per-TTI release signal in a control channel of the first TTI. In some examples of the methods, devices, and non-transitory computer-readable media described above, receiving the per-TTI release signal comprises receiving the per-TTI release signal in a data channel of a preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI. In some examples of the methods, devices, and non-transitory computer-readable media described above, the per-TTI release signal may be a single bit. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 illustrates an example of a system for wireless communication supporting semi-persistent scheduling (SPS) for low latency communication in accordance with an aspect of the present disclosure. [Diagram 2]

[0024] FIG. 2 illustrates an example of a wireless communication system supporting SPS for low latency communications in accordance with an aspect of the disclosure. [Diagram 3]

[0025] FIG. 3 illustrates an example process flow chart for supporting SPS for low latency communications according to an embodiment of the disclosure. [Figure 4]

[0026] FIG. 4 illustrates an example resource structure supporting SPS for low latency communications in accordance with an aspect of the disclosure. [Diagram 5]

[0027] FIG. 5 illustrates an example process flow chart for supporting SPS for low latency communications according to an embodiment of the disclosure. [Figure 6]

[0028] FIG. 6 illustrates an example of a resource structure supporting SPS for low latency communications, according to an aspect of the disclosure. [Figure 7]

[0029] FIG. 7 illustrates a block diagram of a device supporting SPS for low latency communication in accordance with an embodiment of the disclosure. [Figure 8] FIG. 8 illustrates a block diagram of a device supporting SPS for low latency communications in accordance with an aspect of the present disclosure. [Figure 9] FIG. 9 illustrates a block diagram of a device supporting SPS for low latency communications in accordance with an aspect of the present disclosure. [Figure 10]

[0030] FIG. 10 illustrates a block diagram of a system including a user equipment (UE) supporting SPS for low latency communication in accordance with an aspect of the disclosure. [Figure 11]

[0031] FIG. 11 illustrates a block diagram of a system including a base station supporting SPS for low latency communications in accordance with an aspect of the disclosure. [Figure 12]

[0032] FIG. 12 illustrates a method for SPS for low latency communications according to an aspect of the disclosure. [Figure 13] FIG. 13 illustrates a method for SPS for low latency communications according to an aspect of the present disclosure. [Figure 14] FIG. 14 illustrates a method for SPS for low latency communications according to an aspect of the present disclosure. [Figure 15] FIG. 15 illustrates a method for SPS for low latency communication according to an aspect of the present disclosure. Detailed Description

[0024]

[0033] Techniques for semi-persistent scheduling (SPS) for low latency communication are disclosed. A wireless communication system may communicate prioritized traffic using ultra-reliable low latency communication (URLLC) SPS. SPS resources may be assigned to user equipment (UE) supporting URLLC (referred to herein as URLLC UE or UE) using radio resource control (RRC) signaling. The RRC signaling may indicate the duration of a transmission time interval (TTI) during which SPS resources and other attributes (e.g., modulation and coding scheme (MCS)) are explicitly assigned to the URLLC UE. A base station may use URLLC SPS resources to transmit downlink prioritized traffic. A UE may use URLLC SPS resources to transmit uplink prioritized traffic.

[0025]

[0034] Although the control channel is used to signal control data between the UE and the base station, it was not designed to meet the low latency and ultra-high reliability constraints of URLLC. These two constraints make it difficult to design a reliable control channel for resource block scheduling. In a typical transmission scenario, wireless communication devices may communicate on a shared communication medium using a TTI that includes uplink and downlink channels. The uplink and downlink channels may be further divided into resource blocks, and each resource block may be allocated to a wireless communication device for uplink and downlink communications. A scheduling assignment may be communicated to inform a particular wireless communication device which one or more resource blocks have been assigned to it for uplink and / or downlink communications.

[0026]

[0035] Two commonly used scheduling techniques are dynamic scheduling and SPS. However, these conventional scheduling techniques do not meet the low latency and ultra-reliability constraints of URLLC. Dynamic scheduling may not be feasible for URLLC. To meet the low latency requirement for URLLC, resource blocks occurring within a TTI will be scheduled within that same TTI. To meet the ultra-reliability requirement, the receiver should receive and properly decode the scheduling assignment sent within that TTI. Failure to properly decode the scheduling assignment within that TTI would violate the low latency requirement, since it would take too long to request a retransmission and receive the retransmitted scheduling assignment. Thus, dynamic scheduling would require the receiver to properly decode the transmitted scheduling assignment (without requesting a retransmission) to meet the ultra-reliability requirement, and would require a one-time transmission of the scheduling assignment to meet the low latency requirement. These assumptions are not realistic for most wireless communication systems, and therefore dynamic scheduling is not practical to use for URLLC.

[0027]

[0036] Conventional SPS techniques are also inadequate. In SPS, a transmitter and a receiver pre-schedule one or more resource blocks in one or more TTIs to be used for incoming uplink and / or downlink communications. However, channel utilization is an issue for conventional SPS techniques, since sometimes the transmitter, the receiver, or both, do not have data to communicate in one or more blocks of SPS resources. The inability to communicate in even one block of SPS resources adversely affects channel utilization.

[0028]

[0037] To maintain channel utilization at an acceptable level, conventional SPS techniques allow a transmitter to dynamically release a block of SPS resources to allow transport of other traffic when the transmitter does not have data available to communicate. When data becomes available, the transmitter may send a dynamic activation message and resume use of the block of SPS resources. Conventional dynamic release and / or dynamic activation techniques have the same problems as the conventional dynamic scheduling techniques described above. Specifically, conventional dynamic release and / or dynamic activation techniques cannot be used for URLLC because they violate either or both of the low latency requirement or the ultra-high reliability requirement. For example, after dynamic release of a block of SPS resources, conventional dynamic activation techniques require reliable, one-time transmission of scheduling assignments, which cannot be guaranteed in practical scenarios.

[0029]

[0038] The examples described herein overcome problems with conventional SPS techniques by using per-TTI release of blocks of SPS resources, where the blocks of SPS resources are released for a single TTI. Communication over the blocks of SPS resources automatically resumes at the next TTI unless another per-TTI release signal is received. Beneficially, these examples eliminate the need to send activation messages to activate blocks of SPS resources, meeting the low latency and ultra-high reliability requirements for URLLC.

[0030]

[0039] Aspects of the present disclosure are first described in the context of a wireless communication system that may utilize a per-TTI release of blocks of SPS resources. Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts relating to semi-persistent scheduling for low latency communications.

[0031]

[0040] FIG. 1 illustrates an example of a wireless communication system 100 in accordance with various aspects of the disclosure. 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 may be an LTE (or LTE-Advanced) network, or a New Radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (i.e., mission-critical) communications, low latency communications, and communications with low-cost and low-complexity devices. The base station 105, the UE 115, or both may configure blocks of SPS resources in multiple TTIs and utilize per-TTI release to release blocks of SPS resources on a TTI-by-TTI basis when there is insufficient prioritized data for communication in a particular TTI.

[0032]

[0041] The base stations 105 may communicate wirelessly with the UEs 115 via one or more base station antennas. Each base station 105 may provide communication coverage to a respective geographic coverage area 110. The communication links 125 shown in the wireless communication system 100 may include uplink (UL) transmissions from the UEs 115 to the base stations 105, or downlink (DL) transmissions from the base stations 105 to the UEs 115. Control information and data may be multiplexed on the uplink channels or downlink according to various techniques. The control information and data may be multiplexed on the downlink channels using, for example, time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, control information transmitted during a TTI of a downlink channel may be distributed among different control regions (e.g., between a common control region and one or more UE-specific control regions) in a cascaded manner.

[0033]

[0042] The UEs 115 may be distributed throughout the wireless communication system 100, and each UE 115 may be fixed or mobile. The UEs 115 may also be referred to as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The UEs 115 may also be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless node, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a personal electronic device, a handheld device, a personal computer, a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, a machine type communications (MTC) device, an appliance, an automobile, or the like.

[0034]

[0043] In some cases, the UE 115 may also be able to communicate directly with other UEs (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more of the groups of UEs 115 utilizing D2D communication may be within the coverage area 110 of the cell. Other UEs 115 in such groups may be outside the coverage area 110 of the cell or may not be able to receive transmissions from the base station 105 or otherwise. In some cases, multiple groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to every other UE 115 in the group. In some cases, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, the D2D communication occurs independently of the base station 105.

[0035]

[0044] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines, i.e., machine-to-machine (M2M) communication. M2M or MTC may refer to data communication technologies that allow devices to communicate with each other or with a base station without human intervention. For example, M2M or MTC may refer to communication from a device that integrates a sensor or meter to measure or capture information and presents that information to a human interacting with the program or application, or relays that information to an application program or central server that may utilize the information. Some UEs 115 may be designed to collect information or enable automated behavior of machines. 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 business charging.

[0036]

[0045] In some cases, MTC devices may operate using half-duplex (one-way) communications at reduced peak rates. MTC devices may also be configured to enter a power-saving "deep sleep" mode when not engaged in active communications. In some cases, MTC or IoT devices may be designed to support mission-critical functions, and the wireless communications system may be configured to provide ultra-reliable communications for these functions.

[0037]

[0046] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., S1, etc.). The base stations 105 may communicate with each other via backhaul links 134 (e.g., X2, etc.), either indirectly (e.g., through the core network 130) or directly. The base stations 105 may perform radio configuration and scheduling for communication with the UEs 115 or may operate under the control of a base station controller (not shown). In some examples, the base stations 105 may be macro cells, small cells, hot spots, or the like. The base stations 105 may also be referred to as eNodeBs (eNBs) 105.

[0038]

[0047] The base station 105 may be connected to the core network 130 by an S1 interface. The core network 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 gateway (P-GW). The MME may be a control node that handles signaling between the UE 115 and the EPC. All user Internet Protocol (IP) packets may be forwarded through the S-GW, which may itself be connected to the P-GW. The P-GW may provide IP address allocation as well as other functions. The P-GW may be connected to network operator IP services. The operator IP services may include the Internet, intranet, IP multimedia subsystem (IMS), and packet switched (PS) streaming services (PSS).

[0039]

[0048] The core network 130 may provide user authentication, access authorization, tracking, IP connectivity, and other access, routing, or mobility functions. At least some of the network devices, such as the base stations 105-a, may include subcomponents, such as an access network entity 105-b, which may be an example of an access node controller (ANC). Each access network entity 105-b may communicate with several UEs 115 through several other access network transmission entities 105-c, each of which may be an example of a smart radio head or a transmit / receive point (TRP). In some configurations, 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 integrated into a single network device (e.g., the base station 105).

[0040]

[0049] In some cases, wireless local area networks (WLANs) may use frequencies as high as 4 GHz, while the wireless communication system 100 may operate in the ultra high frequency (UHF) frequency range, using a frequency band from 700 MHz to 2600 MHz (2.6 GHz). This range may also be known as the decimeter band, since wavelengths range in length from approximately 1 decimeter to 1 meter. UHF waves may propagate primarily by line of sight and may be blocked by buildings and environmental features. However, the waves may penetrate walls well enough to provide service to UEs 115 located indoors. Transmissions of UHF waves are characterized by smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmissions using smaller frequencies (and longer waves) in the short wave (HF) or very high frequency (VHF) portions of the spectrum. In some cases, the wireless communication system 100 may also utilize the extremely high frequency (EHF) portion of the spectrum (e.g., 30 GHz to 300 GHz). This region may also be known as the millimeter wave band, since the wavelengths are in the range of approximately 1 millimeter to 1 centimeter in length. Thus, EHF antennas may be smaller and more closely spaced than UHF antennas. In some cases, this may facilitate the use of antenna arrays in the UE 115 (e.g., for directional beamforming). However, EHF transmissions may experience greater atmospheric attenuation than UHF transmissions, and may be of shorter range.

[0041]

[0050] Thus, the wireless communication system 100 may support millimeter wave (mmW) communication between the UE 115 and the base station 105. Devices operating in the mmW or EHF bands may have multiple antennas to enable beamforming. That is, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. Beamforming (which may also be referred to as spatial filtering or directional transmission) is a signal processing technique that may be used in a transmitter (e.g., base station 105) to steer and / or shape an entire antenna beam in the direction of a target receiver (e.g., UE 115). This may be achieved by combining elements in an antenna array such that transmitted signals at certain angles experience constructive interference while others experience destructive interference.

[0042]

[0051] The time interval in LTE or NR is the basic time unit (which is T s The time resource may be expressed as a multiple of 10 ms (T f =307200T s ) length of radio frames, which may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may contain ten 1 ms subframes numbered from 0 to 9. A subframe may be further divided into two 0.5 ms slots, each of which contains six or seven modulation symbol periods (depending on the length of the cyclic prefix prepended to each symbol). Excluding the cyclic prefix, each symbol contains 2048 sample periods. In some cases, a subframe may be the smallest scheduling unit, also known as a TTI. In other cases, the TTI may be shorter than a subframe or may be dynamically selected (e.g., in a short TTI burst or in selected component carriers using a short TTI).

[0043]

[0052] A resource element may consist of one symbol period and one subcarrier (e.g., 15 KHz frequency range). A resource block may include 12 consecutive subcarriers in the frequency domain and 7 consecutive OFDM symbols in the time domain (1 slot) in each OFDM symbol for a normal cyclic prefix, i.e., 84 resource elements. In other examples, a resource element may include a portion of a symbol period or more than one symbol period and may include one or more subcarriers. In some examples, a resource block may include more or less than 12 subcarriers, and in some examples, the subcarriers may be contiguous or not. The number of bits carried by each resource element may depend on the modulation scheme (the configuration of symbols that may be selected during each symbol period). Thus, the more resource blocks a UE receives and the more advanced the modulation scheme, the higher the data rate may be.

[0044]

[0053] The wireless communication system 100 may support operation on multiple cells or carriers, which may be referred to as carrier aggregation (CA) or multi-carrier operation. A carrier may also be referred to as a component carrier (CC), layer, channel, etc. The terms "carrier," "component carrier," "cell," and "channel" may be used interchangeably herein. A UE 115 may be configured with multiple downlink CCs and one or more uplink CCs for carrier aggregation. Carrier aggregation may be used with both FDD and TDD component carriers.

[0045]

[0054] In some cases, the wireless communication system 100 may utilize an enhanced component carrier (eCC). An eCC may be characterized by one or more features including a wider bandwidth, a shorter symbol duration, a shorter transmission time interval (TTI), and a modified control channel configuration. In some cases, an eCC may be associated with a dual connectivity configuration or a carrier aggregation configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in a shared spectrum or an unlicensed spectrum (where more than one operator is permitted to use the spectrum). An eCC characterized by a wide bandwidth may include one or more segments that may be utilized by a UE 115 that prefers to use a limited bandwidth (e.g., to conserve power) or is not capable of monitoring the entire bandwidth.

[0046]

[0055] In some cases, an eCC may utilize a different symbol duration than other CCs, which may include the use of a reduced symbol duration compared to the symbol duration of other CCs. The shorter symbol duration may be associated with an increased subcarrier spacing. A TTI in an eCC may consist of one or more symbols. In some cases, the TTI duration (i.e., the number of symbols in a TTI) may be variable. In some cases, an eCC may utilize a different symbol duration than other CCs, which may include the use of a reduced symbol duration compared to the symbol duration of other CCs. The shorter symbol duration is associated with an increased subcarrier spacing. A device, such as a UE 115 or a base station 105, that utilizes an eCC may transmit a wideband signal (e.g., 20, 40, 60, 80 Mhz, etc.) in a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may consist of one or more symbols. In some cases, the TTI duration (i.e., the number of symbols in a TTI) may be variable.

[0047]

[0056] In some cases, the wireless system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless system 100 may use LTE Licensed Assisted Access (LTE-LAA) or LTE Unlicensed (LTE U) radio access technology or NR technology in an unlicensed band, such as the 5 GHz Industrial Scientific and Medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, wireless devices, such as the base station 105 and the UE 115, may use a listen-before-talk (LBT) procedure to ensure that the channel is clear before transmitting data. In some cases, operation in the unlicensed band may be based on a carrier aggregation (CA) configuration in conjunction with a component carrier (CC) operating in the licensed band. Operation in the unlicensed spectrum may include downlink transmission, uplink transmission, or both. Duplexing in the unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0048]

[0057] Conventional SPS techniques may take too long to schedule and / or may not meet stringent packet error rate requirements, such as those of URLLC. In conventional SPS techniques, a transmitter and a receiver may allocate and release uplink, downlink, or both blocks of SPS resources for communication, and the release may be implicit or explicit. In an implicit release, if there is no data to be transmitted, the transmitter may transmit a message (e.g., a medium access control packet data unit (MAC PDU)) containing a value zero (e.g., a zero medium access control service data unit (MAC SDU)) on a block of SPS resources. The receiver may clear the configured uplink grant after receiving a message containing several consecutive new MAC PDUs each containing a zero MAC SDU on a block of SPS resources. In an explicit release, the transmitter may send a release message (e.g., a downlink control information (DCI) format 0, an uplink control information (UCI) message, or the like) to indicate the release of the block of SPS resources. Upon receiving the release message, the receiver may clear the configured uplink grant.

[0049]

[0058] Conventional SPS techniques may also allow activation of released uplink and downlink blocks of SPS resources. After configuring in advance (e.g., by Radio Resource Control (RRC) messaging) a block of SPS resources in the UL direction that are to be released subsequently, the transmitter may send an SPS activation message (e.g., DCI format 0, UCI, or similar for the SPS Cell Radio Network Temporary Identifier (C-RNTI)) to activate the block of SPS resources in the UL direction. The receiver may use the grant provided in the SPS activation message to start transmitting on the block of SPS resources. In the downlink direction, after configuring (e.g., by RRC messaging) a block of SPS resources in the DL direction that are to be released subsequently, the transmitter may send an SPS activation message (e.g., DCI format 1 / 1A / 2 / 2A / 2B / 2C, UCI, or similar for the SPS C-RNTI) to activate the block of SPS resources in the DL direction. The receiver may receive the SPS activation message and begin decoding blocks of SPS resources.

[0050]

[0059] The examples described herein disclose techniques for SPS for low latency communication that overcome problems with conventional techniques. Conventional techniques may take too long to schedule and / or may not meet stringent packet error rate requirements, such as those of URLLC. The examples described herein overcome problems with conventional SPS techniques by using per-TTI release of blocks of SPS resources. Beneficially, communication over the blocks of SPS resources automatically resumes in the next TTI unless another per-TTI release signal is received. A further advantage is that there is no need to send an activation message to resume communication over the blocks of SPS resources in the next TTI, and thus the examples may meet the low latency and ultra-high reliability requirements for URLLC.

[0051]

[0060] 2 illustrates an example of a wireless communication system 200 for SPS for low latency communication. The wireless communication system 200 may include a base station 105-a having a coverage area 110-a, and a first UE 115-a and a second UE 115-b in the coverage area 110-a. The UE 115-a may communicate with the base station 105-a via a communication link 125-a, and the UE 115-b may communicate with the base station 105-a via a communication link 125-b. The base station 105-a is an example of a base station 105, and the UEs 115-a, 115-b are examples of the UEs 115 of FIG. 1. A wireless communication device, such as the base station 105-a, the first UE 115-a, or the second UE 115-a, may configure one or more blocks of SPS resources in one or more TTIs for communication with another wireless communication device. Once configured, any of the wireless communication devices may utilize per-TTI release to release a block of SPS resources in a single TTI, and communication may immediately resume using the block of SPS resources in the next TTI unless another per-TTI release signal is received, as described in further detail below.

[0052]

[0061] 3 illustrates an example of a process flow diagram 300 for SPS for low latency communications. In this example, the base station 105-a and UE 115-a of FIG. 2 may configure a downlink block of SPS resources for communication of prioritized traffic. The prioritized traffic may be, for example, mission-critical data, URLLC data, or the like.

[0053]

[0062] In operation 305, the base station 105-a may coordinate with the UE 115-a to establish a block of SPS resources in multiple TTIs. In one example, radio resource control (RRC) signaling may be exchanged to configure a block of SPS resources in multiple TTIs that may be used by the UE 115-a, the base station 105-a, or both for downlink transmission of prioritized traffic. For example, the base station 105-a may allocate a block of SPS resources in a downlink data channel in one or more TTIs to communicate prioritized traffic to the UE 115-a. During establishment of the block of SPS resources, the base station 105-a may identify in which TTI the block of SPS resources is allocated, including a starting TTI and an ending TTI. A block of SPS resources may be assigned to every TTI for a period of time (e.g., the next 100 TTIs), periodically within a TTI for a period of time (e.g., every 4 TTIs of the next 100 TTIs), or in a selected group of TTIs (e.g., TTI_1, TTI_3, TTI_32, TTI_36, TTI_59 in a number of TTIs ranging from TTI_1 to TTI_100). A block of SPS resources may be one or more resource blocks and may include a portion of a resource block. The base station 105-a may also allocate multiple blocks of SPS resources to the UE 115-a in each TTI or may vary how many blocks of SPS resources are allocated per TTI.

[0054]

[0063] Examples of resource structures including downlink blocks of SPS resources are described below. FIG. 4 illustrates an example of a resource structure 400 for SPS for low latency communication. A number of TTIs 450-a, 450-b, 450-c, and 450-d are shown. Each TTI 450 may include a control channel (CCH) 405 and a data channel (DCH) 410. Examples of the control channel 405 include a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), or the like. Examples of the data channel 410 include a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or the like. In this example, the base station 105-a may coordinate with the UE 115-a to establish a block 415 of SPS resources in the multiple TTIs 450. The block 415 may utilize the same time and frequency resources in each TTI or may vary in time and / or frequency from TTI to TTI. As shown, blocks 415-a, 415-b, 415-c, and 415-d within data channels 410-a, 410-b, 410-c, and 410-d, respectively, are allocated for transmission of prioritized traffic from the base station 105-a to the UE 115-a.

[0055]

[0064] Even when blocks 415 are allocated, there may be TTIs 450 where the base station 105-a has no priority traffic to send or an insufficient amount of priority traffic to send. For efficient utilization of the data channel 410, the base station 105-a may send a release signal every TTI to release a block of SPS resources for a single TTI. The base station 105-a may use the released block to transport other traffic, such as lower priority traffic. An example of lower priority traffic is enhanced mobile broadband (eMBB) data. In some examples, a traffic flow may have a traffic profile that includes a traffic ranking. The base station 105-a may retrieve a traffic profile for each available traffic flow that has data available for transmission and transmit data from the traffic flow with the highest traffic ranking in the released resource block. FIG. 4 merely illustrates a single example of a resource structure 400 and is described from the perspective of the base station 105-a. However, other allocations and set-ups of the resource structure 400 may be used. Additionally, the UE 115-a may also perform the techniques described herein with respect to the base station 105-a.

[0056]

[0065] 3, in operation 310, the base station 105-a may determine the level of prioritized traffic available to send and determine that it has no, or an insufficient level of, prioritized traffic to send in the downlink block 415 of SPS resources of the next TTI. For example, the base station 105-a may compare the amount of prioritized traffic available to send to a threshold and determine that the amount does not meet the threshold (e.g., is less than the threshold).

[0057]

[0066] In operation 315, the base station 105-a may generate and send a per-TTI release signal to indicate that a downlink block 415 of a particular TTI is being released. The base station 105-a may determine that it has no prioritized traffic to send in the block 415 in a particular TTI, or that there is insufficient prioritized traffic, and may communicate a per-TTI release signal to release the block 415 from exclusive prioritized traffic use. For example, with reference to FIG. 4, the base station 105-a may determine that it has no sufficient prioritized traffic to send in TTI 450-c. Based at least in part on this determination, the base station 105-a may communicate a per-TTI release signal R420 in the control channel 405-c of the TTI 450-c to release the block 415-c from being reserved for prioritized traffic. In one example, the per-TTI release signal R420 may be a single bit included in the control channel 405-c to indicate that the block 415-c is being released from transporting prioritized traffic. The per-TTI release signal R420 is sent in the control channel 405-c immediately preceding the data channel 410-c that contains the block 415-c to be released. The base station 105-a may refrain from transmitting priority traffic in the block 415-c.

[0058]

[0067] Rather than allowing the downlink block 415-c to go unused, the base station 105-a may send lower priority (LP) traffic in the block 415-c. The base station 105-a may include control data in the control channel 405-c to indicate which UE should decode the block 415-c, so that the LP traffic may be sent to the UE 115-a or a different UE (e.g., 115-b). Referring again to FIG. 3, operations 320, 325-a, and 330 of FIG. 3 correspond to the control data in the control channel 405-c indicating that the UE 115-b should decode the block 415-c, and operations 325-b and 335 correspond to the control data in the control channel 405-c indicating that the UE 115-a should decode the block 415-c. Operations 320, 325-a, 325-b, 330, and 335 are shown with dashed lines because it is optional for the UE 115-a to perform the corresponding operations. Operations 320, 325-a, and 330 are shown with a first type of dashed line indicating that they may be performed together. Operations 325-b and 335 are shown with a second type of dashed line indicating that they may be performed together.

[0059]

[0068] Beginning at operation 315, the UE 115-a may receive a per-TTI release signal R 420 and control data in the control channel 405-c, and at operation 320 may process the received control data to determine that block 415-c carries LP traffic destined for a different UE. At this time, the UE 115-a may optionally enter a low power state. In the low power state, the UE 115-a may partially or completely power down a decoder, receiver, hardware, circuitry, any combination thereof, or the like, during at least a portion of the downlink data channel 410-c of the TTI 450-c. At operation 325-a, the base station 105-a may send lower priority (LP) traffic, such as, for example, eMBB traffic. In this example, the LP traffic may be destined for the UE 115-b, which receives and decodes the LP traffic. At operation 330, the UE 115-a may exit the low power state. The dropping may occur at the end of the duration of the TTI 450-c, at the end of the duration of the downlink data channel 410-c, or at any other suitable time.

[0060]

[0069] In other examples, the UE 115-a may skip entering and exiting the low power state. In one instance, the UE 115-a may fail to receive the per-TTI release signal R420 and decode the block 415 even if the block 415 did not contain priority traffic for the UE 115-a. Doing so is acceptable because it does not violate the low latency and ultra-high reliability constraints of URLLC. After decoding, the UE 115-a may determine that the block 415 contains lower priority traffic that it can simply discard.

[0061]

[0070] 3, the UE 115-a may process the control data in the control channel 405-c and determine that block 415-c carries LP traffic destined for the UE 115-a. At operation 335, the UE 115-a may receive and decode the LP traffic sent in block 415-c.

[0062]

[0071] In operation 340, the base station 105-a may determine that the level of prioritized traffic available for sending meets a threshold for the next TTI (e.g., TTI 450-d). In operation 345, the base station 105-a may transmit the prioritized traffic to the UE 115-a in block 415. For example, referring to FIG. 4, the base station 105-a may transmit the prioritized traffic to the UE 115-a in block 415-d. Because the per-TTI release signal R420 releases block 415 only for a single TTI (e.g., only for TTI 450-c), the base station 105-a beneficially does not need to send any activation message or other control data to instruct the UE 115-a to decode block 415 in the next TTI 450 (e.g., block 415-d of TTI 450-d). Rather, the default instruction when establishing a block 415 of SPS resources in multiple TTIs is that the UE 115-a should decode the block 415 in each TTI 450 unless a per-TTI release signal R420 is received on the control channel 405 for that TTI 450.

[0063]

[0072] At operation 350, the UE 115-a may monitor for a per-TTI release signal, determine that the control channel 405-d does not include a per-TTI release signal, and proceed to receive and decode a block of SPS resources 415-d within the TTI 450-d.

[0064]

[0073] The operations illustrated in FIG. 3 may be repeated one or more times in the same or different order. For a TTI in which the base station 105-a determines that the amount of prioritized traffic does not meet the threshold, the base station 105-a and the UE 115-a may perform operations 310, 315, and optionally operations 320, 325-a, 325-b, 330, and 335. Thus, the base station 105-a may repeatedly notify the UE 115-a to release the block of SPS resources 415 by sending a release signal per TTI in the control channel 410 of each TTI 450 until new or a sufficient amount of prioritized data arrives for transmission to the UE 115-a. For a TTI in which the base station 105-a determines that the amount of prioritized traffic meets the threshold, the base station 105-a and the UE 115-a may perform operations 340, 345, and 350.

[0065]

[0074] As further described in Figures 5-6, the UE 115-a may similarly use a release signal per TTI to release an uplink block of SPS resources. Figure 5 illustrates an example process flowchart 500 for SPS for low latency communications. In operation 505, the UE 115-a may coordinate with the base station 105-a to establish an uplink block of SPS resources in multiple TTIs, similar to operation 305 described above for establishing a downlink block of SPS resources.

[0066]

[0075] An example of a resource structure including uplink blocks of SPS resources is described below. FIG. 6 illustrates an example of a resource structure 600 for SPS for low latency communication. A number of TTIs 650-a, 650-b, 650-c, and 650-d are shown. Each TTI 650 may include a control channel (CCH) 605 and a data channel (DCH) 610. The control channel 605 is an example of the control channel 405 of FIG. 4, and the data channel 610 is an example of the data channel 410 of FIG. 4. As shown, blocks 615-a, 615-b, 615-c, 615-d, and 615-e in the data channels 610-a, 610-b, 610-c, 610-d, and 610-e, respectively, are allocated for transmission of prioritized traffic from the UE 115-a to the base station 105-a.

[0067]

[0076] Even if an uplink block 605 of SPS resources has been allocated, there may be a TTI 650 in which the UE 115-a has no prioritized traffic to send. For efficient utilization of the data channel 610, the UE 115-a may send a per-TTI release signal in the data channel of the current TTI to release the uplink block in the next TTI. FIG. 6 merely illustrates a single example of the resource structure 600 and is described from the perspective of the UE 115-a. However, other allocations and setups of the resource structure 600 may be used. Additionally, the base station 105-a may perform the techniques described herein with respect to the UE 115-a.

[0068]

[0077] 5, in operation 510 of FIG. 3, the UE 115-a may determine the level of prioritized traffic available to send and determine that it has no or an insufficient level of prioritized traffic to send in the uplink block 615 of SPS resources in the next TTI. For example, the UE 115-a may compare the amount of prioritized traffic available to send to a threshold and determine that the amount does not meet the threshold (e.g., is less than the threshold). The threshold may be the same or different as that used by the base station 105-a in operations 310 and 340.

[0069]

[0078] In operation 515, the UE 115-a may generate and send a per-TTI release signal in the data channel 610 of the current TTI to release the block 615 of the next TTI. The per-TTI release signal may release the block 615 from exclusive prioritized traffic use. The UE 115-a may communicate a per-TTI release signal 620 in the data channel 610 of the TTI 650 immediately preceding the next TTI 650 that includes the block 615 being released from being reserved for prioritized traffic. In one example, with reference to FIG. 6, the UE 115-a may send a per-TTI release signal 620-a (shown as a shaded vertical line) in the data channel 610-b of TTI 650-b to indicate that the block 615-c in the data channel 610-c of TTI 650-c is being released. As mentioned above, the per-TTI release signal 620-a may be a single bit (e.g., a "1" indicating release). The UE 115-a may refrain from transmitting the prioritized traffic in block 615-c.

[0070]

[0079] Rather than allowing block 615-c to go unused, base station 105-a may send lower priority (LP) traffic in block 615-c. Base station 105-a may include control data in control channel 605-c to indicate which UE should decode block 615-c, so that LP traffic may be sent to UE 115-a or a different UE (e.g., 115-b). Referring again to FIG. 5, operations 520, 525-a, and 530 correspond to control data in control channel 605-c indicating that UE 115-b should decode block 615-c, and operations 525-b and 535 correspond to control data in control channel 605-c indicating that UE 115-a should decode block 515-c. Operations 520, 525-a, 525-b, 630, and 535 are shown with dashed lines because it is optional for the UE 115-a to perform the corresponding operations. Operations 520, 525-a, and 530 are shown with a first type of dashed line indicating that they may be performed together. Operations 525-b and 535 are shown with a second type of dashed line indicating that they may be performed together.

[0071]

[0080] Starting at operation 515, the UE 115-a may send a per-TTI release signal 620 and process control data in the control channel 605-c. The UE 115-a may determine that block 615-c carries LP traffic destined for a different UE and may optionally enter a low power state at operation 520. In the low power state, the UE 115-a may partially or completely power down a decoder, receiver, hardware, circuitry, any combination of these, or the like, during at least a portion of the uplink data channel 610-c of the TTI 650-c.

[0072]

[0081] At operation 525-a, the base station 105-a may transmit lower priority traffic to the UE 115-b during the uplink block of released SPS resources. In this example, the LP traffic may be destined for the UE 115-b, which receives and decodes the LP traffic. At operation 530, the UE 115-a may exit the low power state. In other examples, the UE 115-a may skip entering and exiting the low power state in a manner similar to that described above.

[0073]

[0082] In another example, the UE 115-a may process the control data in the control channel 605-c and determine that the block 615-c carries LP traffic destined for the UE 115-a. At operation 535, the UE 115-a may receive and decode the LP traffic sent in the block 615-c.

[0074]

[0083] At operation 540, the UE 115-a may determine that a level of prioritized traffic available to send in the next TTI meets a threshold. At operation 545, the UE 115-a may transmit prioritized traffic to the base station 105-a in the next TTI 650. For example, referring to FIG. 6, the UE 115-a may refrain from sending a per-TTI release message in the data channel 610-d due to the threshold being met and transmit prioritized traffic in an uplink block 615-e of SPS resources in the next TTI. At operation 550, the base station 105 may monitor for a per-TTI release signal, determine that a per-TTI release signal was not received, and receive and decode the prioritized traffic.

[0075]

[0084] The operations illustrated in FIG. 5 may be repeated one or more times in the same or different order. For a TTI in which the UE 115-a determines that the amount of prioritized traffic does not meet the threshold, the UE 115-a and the base station 105-a may perform operations 510, 515, and optionally operations 520, 525-a, 525-b, 530, and 535. In some instances, the UE 115-a may repeatedly notify the base station 105-a to release a block of SPS resources 615 by sending a release signal every TTI 650 in the uplink data channel 610 until new prioritized data arrives for transmission to the base station 105-a. For a TTI in which the UE 115-a determines that the amount of prioritized traffic meets the threshold, the UE 115-a and the base station 105-a may perform operations 540, 545, and 550.

[0076]

[0085] Beneficially, per-TTI release of downlink and / or uplink blocks of SPS resources may be used to meet stringent latency and reliability requirements for URLLC, etc. A further advantage is that communication resumes immediately at the next TTI after release, thus eliminating the need to send activation messages to resume communication of prioritized traffic over SPS assigned resource blocks.

[0077]

[0086] 7 illustrates a block diagram 700 of a wireless device 705 supporting SPS for low latency communications in accordance with various aspects of the disclosure. The wireless device 705 may be an example of an aspect of a user equipment (UE) 115 or a base station 105 as described with reference to FIG. 1. The wireless device 705 may include a receiver 710, a communications manager 715, and a transmitter 720. The wireless device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0078]

[0087] The receiver 710 may receive information, such as control information, user data, or packets associated with various information channels (e.g., information related to SPS for low latency communications, data channels, and control channels, etc.). The information may be passed to other components of the device. The receiver 710 may be an example of an aspect of the transceiver 1035 described with reference to FIG.

[0079]

[0088] The communications manager 715 may be an example of an aspect of the communications manager 1015 described with reference to FIG. 10. The communications manager 715 and / or at least some of its various subcomponents may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions of the communications manager 715 and / or at least some of its various 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 this disclosure. The communications manager 715 and / or at least some of its various subcomponents may be physically located in various locations, including being distributed such that portions of the functions are implemented in different physical locations by one or more physical devices. In some examples, the communications manager 715 and / or at least some of its various subcomponents may be separate and distinct components according to various aspects of the disclosure. In other examples, the communications manager 715 and / or at least some of its various subcomponents may be combined with one or more other hardware components, including, but not limited to, a receiver, a transmitter, a transceiver, one or more other components described in this disclosure, or combinations thereof, in accordance with various aspects of the disclosure.

[0080]

[0089] The communications manager 715 may establish a block of SPS resources in each of a set of TTIs for transmission of prioritized traffic and determine that the level of prioritized traffic to be transmitted during a first TTI of the set of TTIs is below a priority traffic threshold.

[0081]

[0090] The transmitter 720 may transmit signals generated by other components of the device. In some examples, the transmitter 720 may be collocated with the receiver 710 in a transceiver module. For example, the transmitter 720 may be an example of an aspect of the transceiver 1035 described with reference to FIG. 10. The transmitter 720 may include a single antenna or it may include a set of antennas.

[0082]

[0091] The transmitter 720 may transmit a per-TTI release signal to indicate that a block of SPS resources in a first TTI is released from being reserved for prioritized traffic, refrain from transmitting prioritized traffic during the first TTI, and transmit lower priority traffic on the block of SPS resources in the first TTI. In some cases, the prioritized traffic is uplink prioritized traffic. The transmitter 720 may transmit prioritized traffic on the block of SPS resources in a subsequent TTI. In some cases, transmitting the per-TTI release signal includes transmitting a per-TTI release signal in the first TTI, where the wireless node is a base station and the prioritized traffic is downlink prioritized traffic. In some cases, the per-TTI release signal is a single bit. In some cases, transmitting the per-TTI release signal includes transmitting a per-TTI release signal in a second TTI of the set of TTIs preceding the first TTI. In some cases, transmitting the per-TTI release signal includes transmitting a per-TTI release signal in a control channel of the first TTI. In some cases, transmitting the every TTI release signal includes transmitting the every TTI release signal in a data channel of a preceding TTI of the set of TTIs, where the preceding TTI occurs immediately before the first TTI.

[0083]

[0092] 8 illustrates a block diagram 800 of a wireless device 805 supporting SPS for low latency communications in accordance with various aspects of the disclosure. The wireless device 805 may be an example of an aspect of a wireless device 705 or a UE 115 or a base station 105 as described with reference to FIGS. 1 and 7. The wireless device 805 may include a receiver 810, a communications manager 815, and a transmitter 820. The wireless device 805 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0084]

[0093] The receiver 810 may receive information, such as control information, user data, or packets associated with various information channels (e.g., information related to SPS for low latency communication, data channels, and control channels, etc.). The information may be passed to other components of the device. The receiver 810 may be an example of an aspect of the transceiver 1035 described with reference to FIG. 10.

[0085]

[0094] The communications manager 815 may be an example of an aspect of the communications manager 1015 described with reference to Figure 10. The communications manager 815 may also include an SPS block establisher 825 and a traffic level determiner 830.

[0086]

[0095] The SPS block establisher 825 may establish a block of SPS resources in each TTI of the set of TTIs for transmission of prioritized traffic.

[0087]

[0096] The traffic level determiner 830 may determine that the level of prioritized traffic to be transmitted during a first TTI of the set of TTIs is below a priority traffic threshold and determine that the priority traffic is available for transmission in a subsequent TTI of the set of TTIs, the subsequent TTI occurring immediately after the first TTI.

[0088]

[0097] The transmitter 820 may transmit signals generated by other components of the device. In some examples, the transmitter 820 may be co-located with the receiver 810 in a transceiver module. For example, the transmitter 820 may be an example of an aspect of the transceiver 1035 described with reference to FIG. 10. The transmitter 820 may include a single antenna or it may include a set of antennas.

[0089]

[0098] 9 illustrates a block diagram 900 of a communications manager 915 supporting SPS for low latency communications according to various aspects of the disclosure. The communications manager 915 may be an example of an aspect of the communications manager 715, the communications manager 815, or the communications manager 1015 described with reference to FIGS. 7, 8, and 10. The communications manager 915 may include an SPS block establisher 920, a traffic level determiner 925, and a releaser component 930. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0090]

[0099] The SPS block establisher 920 may establish a block of SPS resources in each TTI of the set of TTIs for transmission of prioritized traffic. In some cases, each TTI of the set of TTIs includes a control channel that precedes a data channel in time.

[0091]

[0100] The traffic level determiner 925 may determine that the level of prioritized traffic to be transmitted during a first TTI of the set of TTIs is below a priority traffic threshold and determine that the priority traffic is available for transmission in a subsequent TTI of the set of TTIs, the subsequent TTI occurring immediately after the first TTI.

[0092]

[0101] The releaser component 930 may instruct the transmitter to enter a low power state during at least a portion of the first TTI.

[0093]

[0102] FIG. 10 illustrates a diagram of a system 1000 including a device 1005 supporting SPS for low latency communications according to various aspects of the disclosure. The device 1005 may include or be an example of a wireless device 705, a wireless device 805, or a UE 115, as described above, for example, with reference to FIGS. 1, 7, and 8. The device 1005 may include components for two-way voice and data communications including components for transmitting and receiving communications, including a UE communications manager 1015, a processor 1020, a memory 1025, software 1030, a transceiver 1035, an antenna 1040, and an I / O controller 1045. These components may be in electronic communication via one or more buses (e.g., bus 1010). The device 1005 may communicate wirelessly with one or more base stations 105.

[0094]

[0103] The processor 1020 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a central processing unit (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 1020 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 1020. The processor 1020 may be configured to execute computer-readable instructions stored in memory to perform various functions (e.g., functions or tasks supporting SPS for low latency communications).

[0095]

[0104] The memory 1025 may include random access memory (RAM) and read only memory (ROM). The memory 1025 may store computer-readable, computer-executable software 1030 that includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 1025 may include a basic input / output system (BIOS), which may control basic hardware and / or software operations, such as interaction with peripheral components or devices, among other things.

[0096]

[0105] The software 1030 may include code for implementing aspects of the disclosure, including code for supporting SPS for low latency communications. The software 1030 may be stored in a non-transitory computer-readable medium, such as a system memory or other memory. In some cases, the software 1030 may not be directly executable by a processor, but may cause a computer to perform functions described herein (e.g., when compiled and executed).

[0097]

[0106] The transceiver 1035 may communicate bidirectionally via one or more antennas, wired links, or wireless links, as described above. For example, the transceiver 1035 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1035 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission and for demodulating packets received from the antenna.

[0098]

[0107] In some cases, a wireless device may include a single antenna 1040. However, in some cases, a device may have more than one antenna 1040 and they may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0099]

[0108] The I / O controller 1045 may manage input and output signals for the device 1005. The I / O controller 1045 may also manage peripheral devices that are not integrated into the device 1005. In some cases, the I / O controller 1045 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 1045 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system.

[0100]

[0109] FIG. 11 illustrates a diagram of a system 1100 including a device 1105 supporting SPS for low latency communications according to various aspects of the disclosure. The device 1105 may include or be an example of a wireless device 805, a wireless device 905, or a base station 105, as described above, for example, with reference to FIG. 1, FIG. 8, and FIG. 9. The device 1105 may include components for two-way voice and data communications including components for transmitting and receiving communications, including a base station communications manager 1115, a processor 1120, a memory 1125, software 1130, a transceiver 1135, an antenna 1140, a network communications manager 1145, and a base station coordination manager 1150. These components may be in electronic communication via one or more buses (e.g., bus 1110). The device 1105 may wirelessly communicate with one or more UEs 115.

[0101]

[0110] The base station communications manager 1115 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with the UE 115 in coordination with the other base stations 105. For example, the base station communications manager 1115 may coordinate scheduling of transmissions to the UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the base station communications manager 1115 may provide an X2 interface within a Long Term Evolution (LTE) / LTE-A wireless communications network technology to provide communications between base stations 105.

[0102]

[0111] The processor 1120 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 1120 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 1120. The processor 1120 may be configured to execute computer-readable instructions stored in memory to perform various functions (e.g., functions or tasks supporting SPS for low latency communications).

[0103]

[0112] The memory 1125 may include RAM and ROM. The memory 1125 may store computer-readable, computer-executable software 1130 that includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 1125 may include a BIOS that may, among other things, control basic hardware and / or software operations such as interaction with peripheral components or devices.

[0104]

[0113] The software 1130 may include code for implementing aspects of the disclosure, including code for supporting SPS for low latency communications. The software 1130 may be stored in a non-transitory computer-readable medium, such as a system memory or other memory. In some cases, the software 1130 may not be directly executable by a processor, but may cause a computer to perform functions described herein (e.g., when compiled and executed).

[0105]

[0114] The transceiver 1135 may communicate bidirectionally via one or more antennas, wired links, or wireless links, as described above. For example, the transceiver 1135 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1135 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission and for demodulating packets received from the antenna.

[0106]

[0115] In some cases, a wireless device may include a single antenna 1140. However, in some cases, a device may have more than one antenna 1140 and may be capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0107]

[0116] The network communications manager 1145 may manage communications with a core network (e.g., via one or more wired backhaul links). For example, the network communications manager 1145 may manage the transfer of data communications for client devices, such as one or more UEs 115.

[0108]

[0117] The base station coordination manager 1150 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with the UE 115 in coordination with the other base stations 105. For example, the base station coordination manager 1150 may coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the base station coordination manager 1150 may provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communications between the base stations 105.

[0109]

[0118] FIG. 12 shows a flowchart illustrating a method 1200 for SPS for low latency communications according to various aspects of the disclosure. The operations of the method 1200 may be implemented by the UE 115 or base station 105 or components thereof as described herein. For example, the operations of the method 1200 may be performed by a communications manager as described with reference to FIGS. 7-9. In some examples, the UE 115 or base station 105 may execute a set of code to control functional elements of the device to perform functions described below. Additionally or alternatively, the UE 115 or base station 105 may perform aspects of the functions described below using dedicated hardware.

[0110]

[0119] In block 1205, the UE 115 or the base station 105 may establish a block of SPS resources in each of a plurality of transmission time intervals (TTIs) for transmission of prioritized traffic. The operations of block 1205 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1205 may be performed by an SPS block establisher as described with reference to Figures 7-9.

[0111]

[0120] In block 1210, the UE 115 or the base station 105 may determine that a level of priority traffic to transmit during a first TTI of the plurality of TTIs falls below a priority traffic threshold. The operations of block 1210 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1210 may be performed by a traffic level determiner, as described with reference to Figures 7-9.

[0112]

[0121] In block 1215, the UE 115 or the base station 105 may transmit a per-TTI release signal to indicate that a block of SPS resources in the first TTI is to be released from being reserved for prioritized traffic. The operations of block 1215 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1215 may be performed by a transmitter as described with reference to Figures 7-9.

[0113]

[0122] FIG. 13 shows a flowchart illustrating a method 1300 for SPS for low latency communications according to various aspects of the disclosure. The operations of the method 1300 may be implemented by the UE 115 or base station 105 or components thereof as described herein. For example, the operations of the method 1300 may be performed by a communications manager as described with reference to FIGS. 7-9. In some examples, the UE 115 or base station 105 may execute a set of code to control functional elements of the device to perform functions described below. Additionally or alternatively, the UE 115 or base station 105 may perform aspects of the functions described below using dedicated hardware.

[0114]

[0123] In block 1305, the UE 115 or the base station 105 may establish a block of SPS resources in each of a plurality of transmission time intervals (TTIs) for transmission of prioritized traffic. The operations of block 1305 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1305 may be performed by an SPS block establisher as described with reference to Figures 7-9.

[0115]

[0124] In block 1310, the UE 115 or the base station 105 may determine that a level of priority traffic to transmit during a first TTI of the plurality of TTIs falls below a priority traffic threshold. The operations of block 1310 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1310 may be performed by a traffic level determiner, as described with reference to Figures 7-9.

[0116]

[0125] In block 1315, the UE 115 or the base station 105 may transmit a per-TTI release signal to indicate that a block of SPS resources in the first TTI is to be released from being reserved for prioritized traffic. The operations of block 1315 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1315 may be performed by a transmitter as described with reference to Figures 7-9.

[0117]

[0126] In block 1320, the UE 115 or the base station 105 may determine that prioritized traffic is available for transmission in a subsequent TTI of the plurality of TTIs, the subsequent TTI occurring immediately after the first TTI. The operations of block 1320 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1320 may be performed by a traffic level determiner, as described with reference to Figures 7-9.

[0118]

[0127] In block 1325, the UE 115 or the base station 105 may transmit prioritized traffic in a block of SPS resources in a subsequent TTI. The operations of block 1325 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1325 may be performed by a transmitter as described with reference to Figures 7-9.

[0119]

[0128] FIG. 14 shows a flowchart illustrating a method 1400 for SPS for low latency communications in accordance with various aspects of the disclosure. The operations of the method 1400 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1400 may be performed by a UE communications manager as described with reference to FIG. 10. In some examples, the UE 115 may execute a set of code for controlling functional elements of the device to perform functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below using dedicated hardware.

[0120]

[0129] At block 1405, the UE 115 may establish a block of SPS resources in each of a plurality of transmission time intervals (TTIs) for reception of prioritized traffic. The operations of block 1405 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1405 may be performed by an SPS block establisher as described with reference to Figure 10.

[0121]

[0130] At block 1410, the UE 115 may receive a per-TTI release signal indicating that a block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for prioritized traffic. The operations of block 1410 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1410 may be performed by a receiver as described with reference to Figure 10.

[0122]

[0131] FIG. 15 shows a flowchart illustrating a method 1500 for SPS for low latency communications in accordance with various aspects of the disclosure. The operations of the method 1500 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be performed by a UE communications manager as described with reference to FIG. 10. In some examples, the UE 115 may execute a set of code for controlling functional elements of the device to perform functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below using dedicated hardware.

[0123]

[0132] In block 1505, the UE 115 may establish a block of SPS resources in each of a plurality of transmission time intervals (TTIs) for reception of prioritized traffic. The operations of block 1505 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1505 may be performed by an SPS block establisher as described with reference to Figure 10.

[0124]

[0133] In block 1510, the UE 115 may receive a per-TTI release signal indicating that a block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for prioritized traffic. The operations of block 1510 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1510 may be performed by a receiver as described with reference to Figure 10.

[0125]

[0134] In block 1515, the UE 115 may instruct the decoder to enter a low power state during at least a portion of the first TTI based at least in part on the per-TTI release signal. The operations of block 1515 may be performed according to the methods described with reference to Figures 1-6. In one particular example, aspects of the operations of block 1515 may be performed by a releaser component as described with reference to Figure 10.

[0126]

[0135] It should be noted that the methods described above describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Additionally, aspects from two or more of these methods may be combined.

[0127]

[0136] The techniques described herein may be used for 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. The terms "system" and "network" are often used interchangeably. A Code Division Multiple Access (CDMA) system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and the like. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 releases are commonly referred to as CDMA2000 1X, 1X, and the like. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), and the like. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A Time Division Multiple Access (TDMA) system may implement a radio technology such as Global System for Mobile Communications (GSM).

[0128]

[0137] Orthogonal Frequency Division Multiple Access (OFDMA) systems may 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, and so on. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). 3GPP® Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of the Universal Mobile Telecommunications System (UMTS) that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR, and Global System for Mobile Communications (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 techniques described herein may be used for the systems and radio technologies mentioned above, as well as other systems and radio technologies. While aspects of an LTE or NR system may be described for purposes of example, and LTE or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE or NR applications.

[0129]

[0138] In an LTE / LTE-A network, including such networks described herein, the term evolved Node B (eNB) may be used generally to describe a base station. A system or systems of wireless communications described herein may include heterogeneous LTE / LTE-A or NR networks in which different types of evolved Node Bs (eNBs) provide coverage for various geographic regions. For example, each eNB, gNB or base station may provide communication coverage for a macro cell, a small cell, or other type of cell. The term "cell" may be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on the context.

[0130]

[0139] A base station may be referred to by one skilled in the art as or may include a base transceiver station, radio base station, access point, radio transceiver, Node B, eNode B (eNB), next generation Node B (gNB), Home Node B, Home eNode B, or some other suitable terminology. A geographic coverage area for a base station may be divided into sectors making up only a portion of the coverage area. A system or systems of wireless communications described herein may include different types of base stations (e.g., macro or small cell base stations). A UE described herein may be capable of communicating with various types of base stations and network equipment, including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like. There may be overlapping geographic coverage areas for different technologies.

[0131]

[0140] A macro cell generally covers a relatively large geographic area (e.g., a few kilometers in radius) and may allow unrestricted access by UEs with a service subscription with the network provider. A small cell is a lower power base station compared to a macro cell that may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as the macro cell. Small cells may include pico cells, femto cells, and micro cells, according to various examples. A pico cell, for example, may cover a small geographic area and allow unrestricted access by UEs with a service subscription with the network provider. A femto cell may also cover a small geographic area (e.g., a home) and provide restricted access by UEs with association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like). 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 multiple (eg, two, three, four, etc.) cells (eg, component carriers).

[0132]

[0141] The wireless communications system or 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 approximately 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 either synchronous or asynchronous operation.

[0133]

[0142] A downlink transmission described herein may also be referred to as a forward link transmission, while an uplink transmission may also be referred to as a reverse link transmission. Each communication link described herein, including, for example, the wireless communication systems 100 and 200 of FIGs. 1 and 2, may include one or more carriers, where each carrier may be a signal comprised of multiple subcarriers (e.g., waveform signals of different frequencies).

[0134]

[0143] The description set forth herein with reference to the accompanying drawings describes example configurations and does not represent every example that may be implemented or is within the scope of the claims. As used herein, the term "exemplary" means "providing an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0135]

[0144] In the accompanying drawings, similar components or features may have the same reference label. Furthermore, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes between the similar components. If only a first reference label is used herein, the description is applicable to any one of the similar components having the same first reference label, regardless of the second reference label.

[0136]

[0145] The information and signals described herein may be represented using any of a variety of different techniques and techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0137]

[0146] The various example blocks and modules described in connection with the disclosure herein may be implemented or performed 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. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0138]

[0147] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of the appended claims and this disclosure. For example, depending on the nature of the software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that parts of the functions are implemented in different physical locations. Also, 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 of" or "one or more of") indicates an inclusive list, such as, 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). Additionally, as used herein, the phrase "based on" is not to be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" is to be construed similarly to the phrase "based at least in part on."

[0139]

[0148] Computer-readable media includes both communication media and non-transitory computer storage media, including any medium that facilitates transfer of a computer program from one place to another. Non-transitory storage media may be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may comprise RAM, ROM, Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general purpose or special purpose computer, or a general purpose or special purpose processor. Also, any connection is strictly referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave are included within the definition of media. As used herein, disk and disc include CDs, laser discs, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically while discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0140]

[0149] The description herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily 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. Thus, the present disclosure should not be limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. The invention as described in the claims of the original application is set forth below. [Document name] Claims [C1] 1. A method for wireless communication by a wireless node, comprising: establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for transmission of prioritized traffic; determining that a level of prioritized traffic to be transmitted during a first TTI of the plurality of TTIs is below a prioritized traffic threshold; transmitting a release signal every TTI to indicate that the block of SPS resources in the first TTI is to be released from being reserved for prioritized traffic; A method for providing the above. [C2] refraining from transmitting priority traffic during said first TTI. The method of claim C1, further comprising: [C3] Transmitting lower priority traffic on the block of SPS resources in the first TTI. The method of claim C1, further comprising: [C4] determining that the prioritized traffic is available for transmission in a subsequent TTI of the plurality of TTIs, the subsequent TTI occurring immediately after the first TTI; transmitting prioritized traffic in the block of SPS resources in the subsequent TTI; The method of claim C1, further comprising: [C5] Transmitting the every TTI release signal transmitting the every TTI release signal in the first TTI, where the wireless node is a base station and the prioritized traffic is downlink prioritized traffic. The method of claim C1, comprising: [C6] Transmitting the every TTI release signal transmitting the per-TTI release signal in a second TTI of the plurality of TTIs, where the second TTI precedes the first TTI, where the wireless node is a user equipment (UE) and where the prioritized traffic is uplink prioritized traffic. The method of claim C1, comprising: [C7] instructing a transmitter to enter a low power state during at least a portion of the first TTI. The method of claim C1, further comprising: [C8] The method of claim 1, wherein each of the plurality of TTIs includes a control channel that precedes a data channel in time. [C9] Transmitting the every TTI release signal transmitting the per-TTI release signal in a control channel of the first TTI. [C10] Transmitting the every TTI release signal transmitting the per-TTI release signal in a data channel of a preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The method of C8, comprising: [C11] The method of claim 1, wherein the per-TTI release signal is a single bit. [C12] 1. A method for wireless communication by a wireless node, comprising: Establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for reception of prioritized traffic; receiving a per-TTI release signal indicating that the block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for prioritized traffic; A method for providing the above. [C13] Releasing the block of SPS resources in the first TTI from being reserved for prioritized traffic based at least in part on the per-TTI release signal. The method of C12, further comprising: [C14] receiving lower priority traffic on the block of SPS resources in the first TTI; The method of C12, further comprising: [C15] monitoring a release signal for each subsequent TTI to determine whether the block of SPS resources in a subsequent TTI of the plurality of TTIs is released from exclusive prioritized traffic use. The method of C12, further comprising: [C16] Receiving the every TTI release signal includes: receiving the per-TTI release signal in the first TTI, where the wireless node is a user equipment (UE) and the prioritized traffic is downlink prioritized traffic; The method of claim 12, comprising: [C17] Receiving the every TTI release signal includes: receiving the per-TTI release signal in a second TTI of the plurality of TTIs, where the second TTI precedes the first TTI, where the wireless node is a base station and where the prioritized traffic is uplink prioritized traffic. The method of claim 12, comprising: [C18] instructing a decoder to enter a low power state during at least a portion of the first TTI based at least in part on the per-TTI release signal. The method of C12, further comprising: [C19] The method of C12, wherein each of the plurality of TTIs includes a control channel that precedes a data channel in time. [C20] Receiving the every TTI release signal includes: receiving the per-TTI release signal in a control channel of the first TTI. [C21] Receiving the every TTI release signal includes: receiving the per-TTI release signal in a data channel of a preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The method of claim 19, comprising: [C22] The method of claim 12, wherein the per-TTI release signal is a single bit. [C23] An apparatus for wireless communication in a system, comprising: A processor; memory in electronic communication with the processor; When stored in the memory and executed by the processor, the apparatus establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for transmission of prioritized traffic; determining that a level of prioritized traffic to be transmitted during a first TTI of the plurality of TTIs is below a prioritized traffic threshold; transmitting a release signal every TTI to indicate that the block of SPS resources in the first TTI is to be released from being reserved for prioritized traffic; and instructions operable to cause An apparatus comprising: [C24] An apparatus for wireless communication in a system, comprising: A processor; memory in electronic communication with the processor; When stored in the memory and executed by the processor, the apparatus Establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for reception of prioritized traffic; receiving a per-TTI release signal indicating that the block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for prioritized traffic; and instructions operable to cause An apparatus comprising: [C25] 1. An apparatus for wireless communication, comprising: means for establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for transmission of prioritized traffic; means for determining that a level of priority traffic to be transmitted during a first TTI of the plurality of TTIs falls below a priority traffic threshold; means for transmitting a release signal every TTI to indicate that the block of SPS resources in the first TTI is to be released from being reserved for prioritized traffic; An apparatus comprising: [C26] means for refraining from transmitting priority traffic during said first TTI; The apparatus of C25, further comprising: [C27] means for transmitting lower priority traffic on the block of SPS resources in the first TTI; The apparatus of C25, further comprising: [C28] means for determining that the prioritized traffic is available for transmission in a subsequent TTI of the plurality of TTIs, the subsequent TTI occurring immediately after the first TTI; means for transmitting prioritized traffic in the block of SPS resources in the subsequent TTI; The apparatus of C25, further comprising: [C29] The means for transmitting the every TTI release signal comprises: means for transmitting the per-TTI release signal in the first TTI, wherein the apparatus is a base station and the prioritized traffic is downlink prioritized traffic; The apparatus of C25, comprising: [C30] The means for transmitting the every TTI release signal comprises: means for transmitting the per-TTI release signal in a second TTI of the plurality of TTIs, wherein the second TTI precedes the first TTI, and wherein the device is a user equipment (UE) and the prioritized traffic is uplink prioritized traffic. The apparatus of C25, comprising: [C31] means for instructing a transmitter to enter a low power state during at least a portion of the first TTI. The apparatus of C25, further comprising: [C32] The apparatus of C25, wherein each of the plurality of TTIs includes a control channel that precedes a data channel in time. [C33] The means for transmitting the every TTI release signal comprises: means for transmitting the per-TTI release signal in a control channel of the first TTI; The apparatus of C32, comprising: [C34] The means for transmitting the every TTI release signal comprises: means for transmitting the per-TTI release signal in a data channel of a preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The apparatus of C32, comprising: [C35] The apparatus of C25, wherein the per-TTI release signal is a single bit. [C36] 1. An apparatus for wireless communication, comprising: means for establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for reception of prioritized traffic; means for receiving a per-TTI release signal indicating that the block of SPS resources in a first TTI of the plurality of TTIs is to be released from being reserved for prioritized traffic; An apparatus comprising: [C37] means for releasing the block of SPS resources in the first TTI from being reserved for prioritized traffic based at least in part on the per TTI release signal. The apparatus of C36, further comprising: [C38] means for receiving lower priority traffic on the block of SPS resources in the first TTI; The apparatus of C36, further comprising: [C39] means for monitoring a release signal every subsequent TTI to determine whether the block of SPS resources in a subsequent TTI of the plurality of TTIs is released from exclusive prioritized traffic use. The apparatus of C36, further comprising: [C40] The means for receiving the per TTI release signal comprises: means for receiving the per-TTI release signal in the first TTI, where the apparatus is a user equipment (UE) and the prioritized traffic is downlink prioritized traffic; The apparatus of C36, comprising: [C41] The means for receiving the per TTI release signal comprises: means for receiving the per-TTI release signal at a second TTI of the plurality of TTIs, where the second TTI precedes the first TTI, where the apparatus is a base station and where the prioritized traffic is uplink prioritized traffic. The apparatus of C36, comprising: [C42] means for instructing a decoder to enter a low power state during at least a portion of the first TTI based at least in part on the per-TTI release signal. The apparatus of C36, further comprising: [C43] The apparatus of C36, wherein each of the plurality of TTIs includes a control channel that precedes in time a data channel. [C44] The means for receiving the per TTI release signal comprises: means for receiving the per-TTI release signal in a control channel of the first TTI; The apparatus described in C43, comprising: [C45] The means for receiving the per TTI release signal comprises: means for receiving the per-TTI release signal in a data channel of a preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The apparatus described in C43, comprising: [C46] The apparatus of C36, wherein the per-TTI release signal is a single bit.

Claims

1. 1. A method for wireless communication by a wireless node, comprising: establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for transmission of traffic, wherein the block of SPS resources is established in a data channel of each TTI, and the traffic is prioritized traffic; transmitting a per-TTI release signal on the data channel in a preceding TTI of the plurality of TTIs that occurs immediately before the first TTI to indicate that the block of SPS resources is released from being reserved for the traffic only in the first TTI of the plurality of TTIs; Equipped with A method according to claim 1, wherein traffic of lower priority than the traffic is carried in the block of SPS resources in the first TTI that is released from being reserved for the traffic.

2. 2. The method of claim 1, wherein the wireless node is a user equipment (UE) and the prioritized traffic is uplink prioritized traffic.

3. instructing a transmitter of the wireless node to enter a low power state during at least a portion of the first TTI; The method of claim 1 further comprising:

4. Transmitting the every TTI release signal comprises: transmitting the per-TTI release signal on a data channel of the preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI. The method of claim 1 , comprising:

5. 1. A method for wireless communication by a wireless node, comprising: establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for reception of traffic, wherein the block of SPS resources is established in a data channel of each TTI, and the traffic is prioritized traffic; receiving a per TTI release signal on the data channel in a preceding TTI of the plurality of TTIs occurring immediately prior to the first TTI, the per TTI release signal indicating that the block of SPS resources is to be released from being reserved for the traffic only in a first TTI of the plurality of TTIs; Equipped with A method according to claim 1, wherein traffic of lower priority than the traffic is carried in the block of SPS resources in the first TTI that is released from being reserved for the traffic.

6. The method of claim 5 , wherein the wireless node is a base station and the prioritized traffic is uplink prioritized traffic.

7. instructing a decoder to enter a low power state during at least a portion of the first TTI based at least in part on the per TTI release signal. The method of claim 5 further comprising:

8. Receiving the per TTI release signal includes: receiving the per-TTI release signal on a data channel of the preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The method of claim 5 comprising:

9. 1. An apparatus for wireless communication, comprising: means for establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for transmission of traffic, wherein the block of SPS resources is established in a data channel of each TTI, and the traffic is prioritized traffic; means for transmitting a per TTI release signal on the data channel in a preceding TTI of the plurality of TTIs occurring immediately before the first TTI to indicate that the block of SPS resources is to be released from being reserved for the traffic only in the first TTI of the plurality of TTIs; Equipped with An apparatus, wherein traffic of lower priority than the traffic is carried in the block of SPS resources in the first TTI that is released from being reserved for the traffic.

10. The apparatus of claim 9 , wherein the apparatus is a user equipment (UE) and the prioritized traffic is uplink prioritized traffic.

11. means for instructing a transmitter of the device to enter a low power state during at least a portion of the first TTI. The apparatus of claim 9 further comprising:

12. The means for transmitting the per TTI release signal comprises: means for transmitting the per-TTI release signal in a data channel of the preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The apparatus of claim 9 , comprising:

13. 1. An apparatus for wireless communication, comprising: means for establishing a block of semi-persistent scheduling (SPS) resources in each of a plurality of transmission time intervals (TTIs) for reception of traffic, wherein the block of SPS resources is established in a data channel of each TTI, and the traffic is prioritized traffic; means for receiving, on the data channel in a preceding TTI of the plurality of TTIs occurring immediately before the first TTI, a per TTI release signal indicating that the block of SPS resources is to be released from being reserved for the traffic only in a first TTI of the plurality of TTIs; Equipped with An apparatus, wherein traffic of lower priority than the traffic is carried in the block of SPS resources in the first TTI that is released from being reserved for the traffic.

14. The apparatus of claim 13 , wherein the apparatus is a base station and the prioritized traffic is uplink prioritized traffic.

15. The means for receiving the per TTI release signal comprises: means for receiving the per-TTI release signal on a data channel of the preceding TTI of the plurality of TTIs, where the preceding TTI occurs immediately before the first TTI; The apparatus of claim 13 , comprising:

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