WO2021258381A1

WO2021258381A1 - Dynamic cdrx configuration in a 5g network

Info

Publication number: WO2021258381A1
Application number: PCT/CN2020/098299
Authority: WO
Inventors: Zhuoqi XU; Yuankun ZHU; Pan JIANG; Fojian ZHANG; Chaofeng HUI
Original assignee: Qualcomm Incorporated
Priority date: 2020-06-25
Filing date: 2020-06-25
Publication date: 2021-12-30

Abstract

A user equipment (UE) and base station may be configured to implement dynamic connected mode discontinuous reception (CDRX) in a 5G New Radio (NR) network. In some aspects, the UE may send an uplink communication to a base station, the uplink communication to be evaluated by the base station to determine a channel condition, and receive a configuration communication from the base station, the configuration communication including CDRX parameters based on the channel condition. Further, the UE may perform a CDRX cycle including an awake period for monitoring for a scheduling communication and a sleep period having a duration based on the CDRX parameters.

Description

DYNAMIC CDRX CONFIGURATION IN A 5G NETWORK

BACKGROUND

Technical Field

The present disclosure relates generally to communication systems, and more particularly, to wireless devices configured to implement dynamic connected mode discontinuous reception (CDRX) in a 5G New Radio (NR) network.

Introduction

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR) . 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra reliable low latency communications (URLLC) . Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In an aspect, the disclosure provides a method for implementing dynamic CDRX. The method may include sending an uplink communication to a base station, the uplink communication to be evaluated by the base station to determine a channel condition, receiving a configuration communication from the base station, the configuration communication including connected mode discontinuous reception (CDRX) parameters based on the channel condition; and performing a CDRX cycle including an awake period (i.e., on duration) for monitoring for a scheduling communication and a sleep period (i.e., off duration) having a duration based on the CDRX parameters.

The disclosure also provides an apparatus (e.g., a user equipment (UE) ) including a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform the above method, an apparatus including means for performing the above method, and a non-transitory computer-readable medium storing computer-executable instructions for performing the above method.

In an aspect, the disclosure provides another method for implementing dynamic CDRX. The method may include receiving an uplink communication from a UE, determining a channel condition based on the uplink communication, determining CDRX parameters based on the channel condition, the CDRX parameters configuring a sleep period of a CDRX cycle, and sending, to the UE, a configuration communication, the configuration communication including the CDRX parameters.

The disclosure also provides an apparatus (e.g., a base station) including a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform the above method, an apparatus including means for performing the above method, and a non- transitory computer-readable medium storing computer-executable instructions for performing the above method.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.

FIG. 2A is a diagram illustrating an example of a first 5G/NR frame.

FIG. 2B is a diagram illustrating an example of DL channels within a 5G/NR subframe.

FIG. 2C is a diagram illustrating an example of a second 5G/NR frame.

FIG. 2D is a diagram illustrating an example of UL channels within a 5G/NR subframe.

FIG. 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

FIG. 4 is a diagram illustrating an example of dynamic CDRX technique in an access network in accordance with some aspects of the present disclosure.

FIG. 5A is a diagram illustrating an example of a short CDRX cycle in accordance with some aspects of the present disclosure.

FIG. 5B is a diagram illustrating an example of a long CDRX cycle in accordance with some aspects of the present disclosure.

FIG. 6 is a flowchart illustrating an example of dynamic CDRX in an access network in accordance with some aspects of the present disclosure

FIG. 7 is a diagram illustrating an example of a hardware implementation for a UE employing a processing system.

FIG. 8 is a diagram illustrating an example of a hardware implementation for a base station employing a processing system.

FIG. 9 is a flowchart illustrating an example method performed by a UE that supports dynamic CDRX in accordance with some aspects of the present disclosure.

FIG. 10 is a flowchart illustrating an example method performed by a base station that supports dynamic CDRX in accordance with some aspects of the present disclosure.

An attached Appendix included additional description and figures that form a part of this disclosure.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media, which may be referred to as non-transitory computer-readable media. Non-transitory computer-readable media may exclude transitory signals. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) . The base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) . The macrocells include base stations. The small cells include femtocells, picocells, and microcells. In an aspect, a base station 102 may include a CDRX management component 198 configured to manage CDRX cycles implemented at UEs 104 wirelessly communicatively coupled with the base station 102. The CDRX management component 198 may be configured to determine channel condition information for individual communication channels between the base station 102 and UE 104s, determine configuration parameters for a CDRX cycle implemented by the UE 104 based on the channel condition information, and/or send the configuration parameters to the UEs 104. Further, the UE 104 may include a CDRX component 140 configured to perform dynamic CDRX to conserve battery consumption by the UE 104. As described herein, CDRX may refer to a technique for powering down components of the internal circuitry of the UE when the UE 104 is in a connected mode. When performing CDRX, the UE 104 may alternate between a sleep period (i.e., an “off duration” ) where the UE 104 may power down internal circuitry and suspend reception activities, and an awake period (i.e., an “on duration” ) where the UE 104 may engage in data transfer activities. The CDRX component 140 may include a dynamic configuration component 141 configured to receive configuration parameters from the base station 102, and dynamically implement a CDRX cycle based on the configuration parameters.

The base stations 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) ) may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface) . The base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN) ) may interface with core network 190 through second backhaul links 184. In addition to other functions, the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages. The base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface) . The third backhaul links 134 may be wired or wireless.

The base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) . The communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) . The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .

Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) . D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum. When communicating in an unlicensed frequency spectrum, the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

The small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.

A base station 102, whether a small cell 102a or a large cell (for example, macro base station) , may include or be referred to as an eNB, gNodeB (gNB) , or another type of base station. Some base stations, such as gNB 180 may operate in one or more frequency bands within the electromagnetic spectrum. The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz –7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) . The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” (mmW) band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band. Communications using the mmW radio frequency band have extremely high path loss and a short range. The mmW base station 180 may utilize beamforming 182 with the UE 110 to compensate for the path loss and short range. The base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, or antenna arrays to facilitate the beamforming.

The base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182'. The UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182". The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104. The transmit and receive directions for the base station 180 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176. The IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.

The core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195. The UPF 195 provides UE IP address allocation as well as other functions. The UPF 195 is connected to the IP Services 197. The IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.

The base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) . The UE 104 may also be referred to as a station, 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 communications 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.

FIGS. 2A-2D illustrate example diagrams 200, 230, 250, and 280 illustrating examples structures that may be used for wireless communication by the base station 102 and the UE 104, e.g., for 5G NR communication. FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure. FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe. FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure. FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe. The 5G/NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by FIGS. 2A, 2C, the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) . While

subframes

3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) . Note that the description infra applies also to a 5G/NR frame structure that is TDD.

Other wireless communication technologies may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms) . Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) . The number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies μ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols/slot and 2μ slots/subframe. The subcarrier spacing and symbol length/duration are a function of the numerology. The subcarrier spacing may be equal to 2 ^μ*15 kHz, where μ is the numerology 0 to 5. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=5 has a subcarrier spacing of 480 kHz. The symbol length/duration is inversely related to the subcarrier spacing. FIGS. 2A-2D provide an example of slot configuration 0 with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.

A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as Rx for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .

FIG. 2B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS. The physical broadcast channel (PBCH) , which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) . The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) . The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS) . The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

FIG. 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller/processor 375. The controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) . The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.

At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) . The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.

The controller/processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DL transmission by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160. The controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

With respect to the base station 310, at least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with the CDRX management component 198 of FIG. 1.

With respect to the UE 350, at least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the CDRX component 140 of FIG. 1.

As described herein, a UE may be connected to a base station in a 5G NR network. Further, the UE may perform CDRX to avoid power consumption. Each CDRX cycle may include a sleep period and an awake period. Further, the duration of the sleep period may vary based upon whether the CDRX is configured to perform a short CDRX cycle or long CDRX cycle. In particular, the sleep period for the short CDRX cycle may have a duration that is shorter than the sleep period of the long CDRX cycle. Further, the UE may synchronize with the base station via a synchronization signal block (SSB) in the sleep period. Once the UE synchronizes with the base station, the UE may monitor a PDCCH for the DCI during the awake period. However, when the condition of the channel between the UE and the base station is poor, the UE may struggle to synchronize with the base station. Consequently, the UE may not receive the DCI, which includes scheduling information needed to receive wireless service from the base station.

The present disclosure provides techniques for ensuring efficient and reliable implementation of CDRX by UEs within a communication network. For example, a base station may determine a channel condition associated with a channel between the base station and a UE. In some aspects, the base station may determine the channel condition based on the signal-to-noise ratio (SNR) of a communication received from the UE (e.g., a sounding reference signal (SRS) ) . Further, the base station may determine CDRX parameters for the UE based on the channel condition. In particular, when the channel condition is above a threshold, the base station may generate CDRX parameters that configure the UE to perform a long CDRX cycle. Otherwise, the base station may generate CDRX parameters that configure the UE to perform a short CDRX cycle with a sleep period having a duration less than the sleep period of the long CDRX cycle. Once the base station has generated the CDRX parameters, the base station may send the CDRX parameters to the UE. Upon receipt of the CDRX parameters, the UE may perform CDRX using the CDRX parameters. For instance, when the base station has determined the channel condition is poor (e.g., below a predetermined threshold) , the UE may perform a short CDRX cycle based on the CDRX parameters, and when the base station has determined that the channel condition is satisfactory (e.g., above a predetermined threshold) the UE may perform a long CDRX cycle based on the CDRX parameters. As such, the UE will dynamically modify the CDRX mode in view of the channel condition to ensure that the UE has ample opportunity to synchronize via the SSB while minimizing power consumption.

Referring to FIGS. 4-10, in one non limiting aspect, a system 400 is configured to provide dynamic CDRX configuration in a 5G NR network, according to some aspects.

FIG. 4 is a diagram illustrating an example of dynamic CDRX technique in an access network in accordance with some aspects of the present disclosure. As illustrated in FIG. 4, the system 400 may include a UE 402 connected to a gNB 404. Further, the UE 402 and the gNB 404 may establish a channel 406 for uplink and downlink communications between the UE 402 and the gNB 404. Additionally, in some aspects, the UE 402 may be an example of a UE 104, and the gNB 404 may be an example of a base station 102.

As described above with respect to FIG. 1, the UE 402 may include the CDRX component 140 configured to perform a long CDRX cycle or a short CDRX cycle. The CDRX component 140 may include a dynamic configuration component 141. In addition, the UE 402 may include the reception component 408 and the transmitter component 410. The reception component 408 may include, for example, a radio frequency (RF) receiver for receiving the signals described herein. The transmitter component 410 may include, for example, an RF transmitter for transmitting the signals described herein. In an aspect, the reception component 408 and the transmitter component 410 may be co-located in a transceiver.

As described above with respect to FIG. 1, the gNB 404 may include the CDRX management component 198 configured to manage CDRX cycles performed at UEs (e.g., the UE 402) . The CDRX management component 198 may include the measurement component 412 and the parameter generator component 414. In addition, the gNB 404 may include the reception component 416 and the transmitter component 418. The reception component 416 may include, for example, a radio frequency (RF) receiver for receiving the signals described herein. The transmitter component 418 may include, for example, an RF transmitter for transmitting the signals described herein. In an aspect, the reception component 416 and the transmitter component 418 may be co-located in a transceiver.

As described herein, the UE 402 may operate in a CDRX mode to reduce power consumption, i.e., conserve the battery power of a battery of the UE 402. When performing CDRX, the UE 402 may discontinuously monitor the channel 406 with the gNB 404. In other words, the UE 402 may alternate between a sleep period where one or more components are powered down, and an awake period where data transfers may occur via the channel 406. In particular, a CDRX cycle may include the awake period where the UE 402 employs the reception component 408 for a period of time to monitor the PDCCH. The same CDRX cycle may further include the sleep period where the UE 402 powers down the reception component 408 and does not engage in reception activities for a period of time to conserve power. Further, in response to the UE 402 receiving any downlink data indicated by the PDCCH from the gNB 404 in the awake period, the UE 402 may abandon the CDRX mode and continuously monitor the PDCCH for downlink data. In some aspects, CDRX may provide significant power savings at the UE 402 since at least the reception component 408 can be turned off.

Initially, the UE 402 may be connected to the gNB 404, which may be considered a serving cell. Further, the UE 402 may send an uplink communication 420 to the gNB 404. For example, the transmitter component 410 may send a SRS to the base station 404. Upon receipt of the uplink communication 420, the CDRX management component 198 may determine a channel condition of the channel 406 using the uplink communication 420, and generate CDRX parameters 422 based at least in part on the channel condition. For example, the CDRX management component 198 may determine the SNR of the uplink communication 420, compare the SNR to a threshold indicating whether the channel condition is poor or satisfactory, and generate CDRX parameters 422 for the UE 402 based upon the comparison. If the CDRX management component 198 determines that the channel condition is poor (e.g., below the threshold for a monitoring period) , the CDRX management component 198 may generate CDRX parameters 422 that cause the UE 402 to perform a short CDRX cycle, and if the CDRX management component 198 determines that the channel condition is satisfactory (e.g., above the threshold for a monitoring period) , the CDRX management component 198 may generate CDRX parameters 422 that cause the UE 402 to perform a long CDRX cycle. Further, the CDRX management component 198 may send the CDRX parameters 422 to the UE 402 within a configuration communication 423. In some aspects, the CDRX parameters 422 may include values for a drx-onDurationTimer attribute and a drx-LongCycleStartOffset attribute, respectively. The drx-onDurationTimer attribute may correspond to the duration at the beginning of the CDRX cycle, and the drx-LongCycleStartOffset attribute may correspond to the cycle of the long CDRX cycle.

Upon receipt of the CDRX parameters 422, the UE 402 may be reconfigured to perform one or more CDRX cycles based on the CDRX parameters 422. For instance, the CDRX component 140 may perform one or more long CDRX cycles in response to implementing the CDRX parameters 422. In some aspects, the long CDRX cycle may include performance of a sleep period having a duration of 512 ms, 1024 ms, etc. Alternatively, the CDRX component 140 may perform one or more short CDRX cycle in response to implementing the CDRX parameters 422. In some aspects, the short CDRX cycle may include performance of a sleep period having a duration of 40 ms, 64 ms, etc.

FIG. 5A is a diagram 500 illustrating an example of a short CDRX cycle in accordance with some aspects of the present disclosure. As illustrated in FIG. 5A, a short CDRX cycle 502 may include a sleep period 504 and an awake period 506. Further, a UE performing the short CDRX cycle 502 may receive an SSB 508 from a base station during a sync period 510.

FIG. 5B is a diagram 512 illustrating an example of a long CDRX cycle in accordance with some aspects of the present disclosure. As illustrated in FIG. 5B, a long CDRX cycle 514 may include a sleep period 516 and an awake period 518. Further, a UE performing the long CDRX cycle 514 may receive an SSB 520 from a base station during a sync period 522. As illustrated in FIGS. 5A-5B, the sleep period 504 of the short CDRX cycle 502 is shorter in duration than the sleep period 516 of the long CDRX cycle 514.

FIG. 6 is a flowchart of a method 600 of implementing dynamic CDRX in a 5G NR network. The method may be performed by the base station 404 including the CDRX management component 198.

At block 610, the base station 404 may determine the SNR of the uplink communication 420. For example, the base station 404 may be a serving cell to the UE 402, and receive the uplink communication 420 from the UE 402. At block 620, the base station 404 may determine whether the SNR is greater than a threshold amount (i.e., SNR_Threshold) for a period of time (i.e., T_mon) . For example, the base station 404 may determine whether the SNR is greater than 10 decibels for 5 seconds. If the SNR is greater than the threshold amount for the period of time, the base station 404 may proceed to 630. At block 630, the base station 404 may reconfigure the UE 402 to perform a long CDRX cycle. For example, the base station 404 may send the CDRX parameters 422 to the UE 402, and the CDRX parameters 422 may be configured to cause the UE to perform a long CDRX cycle. If the SNR is lesser than the threshold amount for the period of time, the base station 404 may proceed to 640. At block 640, the base station 404 may reconfigure the UE 402 to perform a short CDRX cycle. For example, the base station 404 may send the CDRX parameters 422 to the UE 402, and the CDRX parameters 422 may be configured to cause the UE 402 to perform a short CDRX cycle.

FIG. 7 is a diagram 700 illustrating an example of a hardware implementation for a UE 702 (e.g., the UE 104 of FIG. 1 or the UE 402 of FIG. 4) employing a processing system 714. The processing system 714 may be implemented with a bus architecture, represented generally by the bus 724. The bus 724 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 714 and the overall design constraints. The bus 724 links together various circuits including one or more processors and/or hardware components, represented by the processor 704, the CDRX component 140, the dynamic configuration component 141, and the computer-readable medium /memory 706. The bus 724 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system 714 may be coupled with a transceiver 710. The transceiver 710 is coupled with one or more antennas 720. The transceiver 710 provides a means for communicating with various other apparatus over a transmission medium. The transceiver 710 receives a signal from the one or more antennas 720, extracts information from the received signal, and provides the extracted information to the processing system 714, specifically the reception component 408. In addition, the transceiver 710 receives information (e.g., the uplink communication 420) from the processing system 714, specifically the transmitter component 410, and based on the received information, generates a signal to be applied to the one or more antennas 720. The processing system 714 includes a processor 704 coupled with a computer-readable medium /memory 706. The processor 704 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 706. The software, when executed by the processor 704, causes the processing system 714 to perform the various functions described supra for any particular apparatus. The computer-readable medium /memory 706 may also be used for storing data that is manipulated by the processor 704 when executing software. The processing system 714 further includes at least one of the CDRX component 140, or the dynamic configuration component 141. The components may be software components running in the processor 704, resident/stored in the computer readable medium /memory 706, one or more hardware components couple to the processor 704, or some combination thereof. The processing system 714 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359. Alternatively, the processing system 714 may be the entire UE (e.g., see 350 of FIG. 3) .

The CDRX component 140 may cause the UE 702 to perform CDRX to conserve battery power. In particular, the CDRX component 140 may manage the UE 702 alternating between the sleep period and awake period. Further, the CDRX component 140 may manage suspension of CDRX in response to activity during the awake period. The dynamic configuration component 141 may configure the performance of CDRX by the UE 702. In particular, the dynamic configuration component 141 may receive the CDRX parameters 422 from the base station 404, and configure the CDRX component 140 to perform a short CDRX cycle or a long CDRX cycle based upon the CDRX parameters 422.

In one configuration, the UE 702 for wireless communication includes means for sending an uplink communication to a base station, the uplink communication to be evaluated by the base station to determine a channel condition, receiving a configuration communication from the base station, the configuration communication including CDRX parameters based on the channel condition, performing a CDRX cycle including an awake period for monitoring for a scheduling communication and a sleep period having a duration based on the CDRX parameters. The aforementioned means may be one or more of the aforementioned components of the UE 702 and/or the processing system 714 of the UE 702 configured to perform the functions recited by the aforementioned means. As described supra, the processing system 714 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359. As such, in one configuration, the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.

FIG. 8 is a diagram 800 illustrating an example of a hardware implementation for a base station 802 (e.g., the base station 102 /180 of FIG. 1 or the base station 404 of FIG. 4) employing a processing system 814. The processing system 814 may be implemented with a bus architecture, represented generally by the bus 824. The bus 824 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 814 and the overall design constraints. The bus 824 links together various circuits including one or more processors and/or hardware components, represented by the processor 804, the CDRX management component 198, the measurement component 412, and the parameter generator component 414, and the computer-readable medium /memory 806. The bus 824 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system 814 may be coupled with a transceiver 810. The transceiver 810 may be coupled with one or more antennas 820. The transceiver 810 provides a means for communicating with various other apparatus over a transmission medium. The transceiver 810 receives a signal from the one or more antennas 820, extracts information from the received signal, and provides the extracted information to the processing system 814, specifically the reception component 416. In addition, the transceiver 810 receives information (e.g., the configuration communication 423) from the processing system 814, specifically the transmitter component 418, and based on the received information, generates a signal to be applied to the one or more antennas 820. The processing system 814 includes a processor 804 coupled with a computer-readable medium /memory 806. The processor 804 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 806. The software, when executed by the processor 804, causes the processing system 814 to perform the various functions described supra for any particular apparatus. The computer-readable medium /memory 806 may also be used for storing data that is manipulated by the processor 804 when executing software. The processing system 814 further includes at least one of the CDRX management component 198, the measurement component 412, and the parameter generator component 414. The components may be software components running in the processor 804, resident/stored in the computer readable medium /memory 806, one or more hardware components coupled with the processor 804, or some combination thereof. The processing system 814 may be a component of the base station 310 and may include the memory 376 and/or at least one of the TX processor 316, the RX processor 370, and the controller/processor 375. Alternatively, the processing system 814 may be the entire base station (e.g., see 310 of FIG. 3) .

The CDRX management component 198 may manage the performance of CDRX by UEs, e.g., the UE 402. For example, the CDRX management component 198 may determine whether the UE 402 should perform CDRX and send the UE 402 the configuration communication 423 with CDRX parameters 422 for performing CDRX.

The measurement component 412 may determine a channel condition of a communication channel, e.g., the channel 406. For example, in some aspects, the measurement component 412 may determine the SNR of a communication received from a UE 104. In some other aspects, the measurement component 412 may determine the channel condition from alternative means. For example, the measurement component 412 may determine the channel condition based on a value (e.g., reference signal received power, reference signal received quality, etc. ) determined by the UE 104 and sent to the base station 802.

The parameter generator component 414 may determine the CDRX parameters 422 to be implemented by CDRX performed by a UE, e.g., the UE 104. In particular, the parameter generator component 414 may generate CDRX parameters 422 that cause a UE to perform a short CDRX cycle when the measurement component 412 determines that the channel condition is poor, and generate CDRX parameters 422 that cause a UE to perform a long CDRX cycle when the measurement component 412 determines that the channel condition is satisfactory.

In one configuration, the base station 802 for wireless communication includes means for receiving an uplink communication from a UE, determining a channel condition based on the uplink communication, determining CDRX parameters based on the channel condition, the CDRX parameters configuring a sleep period of a CDRX cycle and sending, to the UE, a configuration communication, the configuration communication including the CDRX parameters. The aforementioned means may be one or more of the aforementioned components of the base station 802 and/or the processing system 814 of the base station 802 configured to perform the functions recited by the aforementioned means. As described supra, the processing system 814 may include the TX Processor 316, the RX Processor 370, and the controller/processor 375. As such, in one configuration, the aforementioned means may be the TX Processor 316, the RX Processor 370, and the controller/processor 375 configured to perform the functions recited by the aforementioned means.

FIG. 9 is a flowchart illustrating an example method 900 performed by a UE that supports dynamic CDRX in accordance with some aspects of the present disclosure. The method may be performed by a UE (e.g., the UE 104, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as the CDRX component 140, the TX processor 368, the RX processor 356, and/or the controller/processor 359; the UE 402; the UE 702) .

At block 910, the method 900 may include sending an uplink communication to a base station, the uplink communication to be evaluated by the base station to determine a channel condition. For example, the UE 402 may send the uplink communication 420 to the base station 404.

At sub-block 912, the block 910 may optionally include sending a sounding reference signal (SRS) to the base station. For example, the uplink communication 420 may be a SRS that the base station 404 may employ to determine a channel condition of the channel 406 between the UE 402 and the base station 404.

Accordingly, the UE 104, the UE 402, the UE 702, the TX processor 368, the RX processor 356, and/or the controller/processor 359 may provide means for sending an uplink communication to a base station, the uplink communication to be evaluated by the base station to determine a channel condition.

At block 920, the method 900 may include receiving a configuration communication from the base station, the configuration communication including CDRX parameters based on the channel condition. For example, the UE 402 may receive the configuration communication 423 including the CDRX parameters 422 from the base station 404.

At sub-block 922, the block 920 may optionally include receiving a radio resource control (RRC) reconfiguration message indicating a type of CDRX cycle to perform at the UE. For example, the UE 402 may receive a RRC reconfiguration message including the CDRX parameters 422.

Accordingly, the UE 104, the UE 402, the UE 702, the TX processor 368, the RX processor 356, and/or the controller/processor 359 may provide means for receiving a configuration communication from the base station, the configuration communication including CDRX parameters based on the channel condition.

At block 930, the method 900 may include performing a CDRX cycle including an awake period for monitoring for a scheduling communication and a sleep period having a duration based on the CDRX parameters. For example, the dynamic configuration component 141 may configure the CDRX component 140 to perform CDRX in accordance with the CDRX parameters 422, and the CDRX component 140 may perform CDRX based on the CDRX parameters 422. As described in detail herein, performing CDRX may include implementing an awake period for monitoring for a scheduling communication 424 (e.g., a DCI message) and a sleep period where the reception component 408 is powered down to conserve battery power.

At sub-block 932, the block 930 may optionally include performing a short CDRX cycle based upon the CDRX parameters. For example, the dynamic configuration component 141 may configure the CDRX component 140 to perform a short CDRX cycle based on the CDRX parameters 422, and the CDRX component 140 may perform the short CDRX cycle.

At sub-block 934, the block 930 may optionally include performing a long CDRX cycle based upon the CDRX parameters. For example, the dynamic configuration component 141 may configure the CDRX component 140 to perform a long CDRX cycle based on the CDRX parameters 422, and the CDRX component 140 may perform the long CDRX cycle.

As described herein, the sleep period of the short CDRX cycle may be shorter in duration than the sleep period of the long CDRX cycle.

Accordingly, the UE 104, the UE 402, the UE 702, the TX processor 368, the RX processor 356, and/or the controller/processor 359 executing the dynamic configuration component 141 may provide means for performing a CDRX cycle including an awake period for monitoring for a scheduling communication and a sleep period having a duration based on the CDRX parameters.

At block 940, the method 900 may optionally include receiving downlink control information (DCI) during the awake period. For example, the UE 402 may synchronize with the base station via the SSB 508 and receive the scheduling communication 424 during the awake period of a short CDRX cycle or a long CDRX cycle. In some aspects, the scheduling communication 424 may be a DCI.

Accordingly, the UE 104, the UE 402, the UE 702, the TX processor 368, the RX processor 356, and/or the controller/processor 359 may provide means for receiving downlink control information (DCI) during the awake period.

FIG. 10 is a flowchart illustrating an example method 1000 performed by a base station that supports dynamic CDRX in accordance with some aspects of the present disclosure. The method may be performed by a base station (e.g., the base station 102, which may include the memory 360 and which may be the entire base station or a component of the base station, such as the CDRX management component 198, the TX processor 368, the RX processor 356, and/or the controller/processor 359; the base station 404; the base station 802) .

At block 1010, the method 1000 may include receiving an uplink communication from a user equipment. For example, the base station 404 may receive the uplink communication 420 from the UE 402.

At sub-block 1012, the block 1010 may optionally include receiving a sounding reference signal from the UE. For example, in some aspects, the uplink communication 420 may be a SRS sent by the UE 402 to the base station 404.

Accordingly, the base station 102, the base station 404, the base station 802, the TX processor 316, the RX processor 370, and/or the controller/processor 375 may provide means for receiving an uplink communication from a user equipment.

At block 1020, the method 1000 may include determining a channel condition based on the uplink communication. For example, the measurement component 412 may determine a channel condition of the channel 406 between the UE 402 and the base station 406 based on the uplink communication 420.

At sub-block 1022, the block 1020 may optionally include determining a SNR of the uplink communication and comparing the SNR to a threshold. For example, in some aspects, the measurement component 412 may determine the SNR of the uplink communication 420 and compare the SNR to a threshold value. If the SNR is greater than the threshold value for a period of time, the base station 404 may determine that the channel condition of the channel 406 is satisfactory. Otherwise, the base station 404 may determine that the channel condition of the channel 406 is poor. In some aspects, the threshold may be 10 decibels and the monitoring period may be 5 seconds.

Accordingly, the base station 102, the base station 404, the base station 802, the TX processor 316, the RX processor 370, and/or the controller/processor 375 executing the measurement component 412 may provide means for determining a channel condition based on the uplink communication.

At block 1030, the method 1000 may include determining CDRX parameters based on the channel condition, the CDRX parameters configuring a sleep period of a CDRX cycle. For example, the parameter generator component 414 may determine the CDRX parameters 422 based on the channel condition.

At sub-block 1032, the block 1030 may optionally include setting the CDRX cycle to a long CDRX cycle. For example, the parameter generator component 414 may generate the CDRX parameters 422 so that the CDRX parameters 422 cause the UE 402 to perform a long CDRX cycle.

At sub-block 1034, the block 1030 may optionally include setting the CDRX cycle to a short CDRX cycle. For example, the parameter generator component 414 may generate the CDRX parameters 422 so that the CDRX parameters 422 cause the UE 402 to perform a short CDRX cycle.

Accordingly, the base station 102, the base station 404, the base station 802, the TX processor 316, the RX processor 370, and/or the controller/processor 375 executing the parameter generator component 414 may provide means for determining CDRX parameters based on the channel condition, the CDRX parameters configuring a sleep period of a CDRX cycle.

At block 1040, the method 1000 may include sending, to the UE, a configuration communication, the configuration communication including the CDRX parameters. For example, the CDRX management component 198 may send the configuration communication 423 including the CDRX parameters 422 to the UE 402.

At sub-block 1042, the block 1040 may include sending a RRC reconfiguration message indicating a type of CDRX cycle to perform at the UE. For example, the base station 404 may send a RRC reconfiguration message (i.e., the configuration communication 423) including the CDRX parameters 422. Further, the CDRX parameters 422 may indicate whether the UE 402 should perform a short CDRX cycle or a long CDRX cycle.

Accordingly, the base station 102, the base station 404, the base station 802, the TX processor 316, the RX processor 370, and/or the controller/processor 375 may provide means for sending, to the UE, a configuration communication, the configuration communication including the CDRX parameters.

It is understood that the specific order or hierarchy of blocks in the processes /flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes /flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” The word “exemplary” is used herein to mean “serving as an example, instance, or illustration. ” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ”

Technology for Dynamic CDRX Configuration in 5G Network

PROBLEM DESCRIPTION:

In 5G network (NW) , CDRX is a vital function as it can help save the power of UE. The configuration is always like this:

1. drx-onDurationTimer is the duration at the beginning of a DRX Cycle

2. drx-LongCycleStartOffset is the Cycle of Long DRX

UE need to wake up in advance to sync with SSB for TTL/FTL calibration, then it can monitor PDCCH when it enters drx-onDurationTimer in CDRX Cycle.

However, inappropriate CDRX configuration will lead UE to experience a terrible result such as: missing DCI.

It is wise for NW to do dynamic CDRX configuration which can not only help UE save power but also decrease the risk of missing DCI.

ANALYSIS:

NW can reconfigure CDRX configuration based on SRS sent by UE to evaluate the Channel condition.

When UE at good channel condition, NW can configure CDRX cycle with long as it is easy for UE to synchronize with SSB.

When UE at bad channel condition, NW can configure CDRX cycle with short as it is a litter hard for UE to synchronize with SSB. UE need to be waked up frequently to keep synchronization with NW.

DESCRIPTION:

NW can monitor the SRS of UE to calculate the SNR

1. When SNR is larger than SNR_THRESHOLD in T_mon, NW can reconfigure long CDRX cycle like (ms 512 ms1024 and so on)

2. When SNR is less than SNR_THRESHOLD in T_mon, NW can reconfigure long CDRX cycle like (ms 40 ms64 and so on)

SNR_THRESHOLD: expressed in db

Default value=10 db

T_mon: express in s

Default value: 5s

Both parameters are configurable to adjust the condition.

Detectability

Can be detected in lab testing and can be observed in network configuration OTA message.

Claims

A method of wireless communication at a base station, comprising:

receiving an uplink communication from a user equipment (UE) ;

determining a channel condition based on the uplink communication;

determining a CDRX parameter based on the channel condition, the CDRX parameter configuring a sleep period of a CDRX cycle; and

sending, to the UE, a configuration communication, the configuration communication including the CDRX parameters.
The method of claim 1, wherein determining the channel condition based on the uplink communication comprises:

determining a signal-to-noise ratio (SNR) of the uplink communication; and

comparing the SNR to a threshold.
The method of claim 2, wherein the SNR is greater than the threshold, and determining the CDRX parameter comprises setting the CDRX cycle to a long CDRX cycle.
The method of claim 2, wherein the SNR is less than the threshold, and determining the CDRX parameter comprises setting the CDRX cycle to a short CDRX cycle.
The method of claim 1, wherein receiving the uplink communication from the UE comprises receiving a sounding reference signal from the UE.
The method of claim 1, wherein sending the configuration communication comprises sending a radio resource control (RRC) reconfiguration message indicating a type of CDRX cycle to perform at the UE.
The method of claim 1, further comprising sending a synchronization signal block (SSB) and downlink control information (DCI) , the DCI configured to be receive during an awake period of the CDRX cycle.
A base station for wireless communication, comprising means for performing the method of any of claims 1-8.
A base station for wireless communication, comprising:

a memory; and

at least one processor coupled with the memory and configured to execute the computer-executable instructions to perform the method of any of claims 1-8.
A non-transitory computer-readable medium storing computer executable code, the code when executed by a processor cause the processor to perform the method of any of claims 1-8.
A method of wireless communication at a user equipment (UE) , comprising:

sending an uplink communication to a base station, the uplink communication to be evaluated by the base station to determine a channel condition;

receiving a configuration communication from the base station, the configuration communication including connected mode discontinuous reception (CDRX) parameter based on the channel condition; and

performing a CDRX cycle based on the CDRX parameter, wherein the CDRX cycle includes an awake period for monitoring for a scheduling communication and a sleep period.
The method of claim 11, wherein performing the CDRX cycle comprises:

performing a short CDRX cycle based upon a first value of the CDRX parameter; or

performing a long CDRX cycle based upon a second value of the CDRX parameter, wherein a duration of the long CDRX cycle is greater than a duration of the short CDRX cycle.
The method of claim 12, wherein the channel condition comprises a signal-to-noise ratio (SNR) of the uplink communication, wherein the first value of the CDRX parameter is based on the base station determining the SNR of the uplink communication achieves a threshold, and wherein the second value of the CDRX parameter is based on the base station determining the SNR of the uplink communication does not achieve the threshold.
The method of claim 11, further comprising receiving downlink control information (DCI) during the awake period.
The method of claim 11, wherein sending the uplink communication to the base station comprises sending a sounding reference signal (SRS) to the base station.
The method of claim 11, wherein receiving the configuration communication comprises receiving a radio resource control (RRC) reconfiguration message indicating a type of CDRX cycle to perform at the UE.
The method of claim 11, wherein the scheduling communication is downlink control information (DCI) , and further comprising:

synchronizing with the base station via a synchronization signal block (SSB) ; and

monitoring, based on the synchronizing during the awake period, a physical downlink control channel (PDCCH) for the DCI.
The method of claim 11, wherein the base station is a 5G NR gNodeB.
A user equipment for wireless communication, comprising means for performing the method of any of claims 11-18.
A user equipment for wireless communication, comprising:

a memory; and

at least one processor coupled with the memory and configured to execute the computer-executable instructions to perform the method of any of claims 11-18.
A computer-readable medium storing computer executable code, the code when executed by a processor cause the processor to perform the method of any of claims 11-18.