# US 10,122,559 B2 · Uplink channel quality measurement using a subframe with high-intensity reference signal bursts > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,559 B2 - Document ID: US10122559B2 - Status: Granted - Kind: B2 - Application number: 15/251,904 - Filed: 2016-08-30 - Published: 2017-09-21 - Granted: 2018-11-06 - Earliest claimed: 2016-03-21 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alexandros Manolakos; Jing Jiang; June Namgoong; Tao Luo; Joseph Binamira Soriaga; Tingfang Ji - Web page: https://patentgrep.com/patent/US10122559B2 ## CPC - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 27/2613: {Structure of the reference signals} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04L 5/0082: {at predetermined intervals} - H04L 5/1469: {using time-sharing} - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Aspects of the present disclosure provide a wireless device that communicates with another wireless device utilizing self-contained subframes. The wireless device communicates with a scheduling entity utilizing a plurality of self-contained subframes that include a first subframe and a second subframe. Each of the self-contained subframes includes an uplink (UL) portion and a downlink (DL) portion. The wireless device further receives DL control information from the scheduling entity in the DL portion of the first subframe, and transmits UL data that includes a plurality of reference signal bursts to the scheduling entity in the UL portion of the first subframe. The plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the first subframe. ## Claims ### Claim 1 A method of wireless communication operable at a subordinate entity, comprising: communicating with a scheduling entity utilizing a plurality of self-contained subframes comprising a first subframe and a second subframe, each of the self-contained subframes comprising an uplink (UL) portion and a downlink (DL) portion; waking up from a discontinuous reception (DRX) off mode to receive DL control information from the scheduling entity in the DL portion of the first subframe; transmitting first UL data comprising a wake-up burst structure including a plurality of reference signal bursts to the scheduling entity in the UL portion of the first subframe, wherein the plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the first subframe; and transmitting second UL data comprising a nominal number of reference signal bursts to the scheduling entity in the UL portion of the second subframe, wherein the wake-up burst structure comprises a greater number of reference signal bursts than the nominal number of reference signal bursts. ### Claim 2 (depends on 1) The method of claim 1, wherein the nominal number of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the second subframe. ### Claim 3 (depends on 1) The method of claim 1, further comprising: precoding the plurality of reference signal bursts differently from one another such that the plurality of reference signal bursts are transmitted by different antennas of the subordinate entity. ### Claim 4 (depends on 1) The method of claim 1, further comprising: waking up from a discontinuous reception (DRX) off mode during a DL-centric subframe of the plurality of self-contained subframes, wherein the DL-centric subframe is earlier in time than the second subframe; receiving DL control information, from the scheduling entity, in the DL-centric subframe; and transmitting UL data comprising a plurality of reference signal bursts to the scheduling entity in the UL portion of the second subframe such that the plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the second subframe. ### Claim 5 (depends on 1) The method of claim 1, further comprising: utilizing continuous phase modulation or constant phase modulation to transmit the reference signal bursts. ### Claim 6 (depends on 1) The method of claim 1, further comprising: configuring the first UL data to indicate that the reference signal bursts conform with a suggested structure of the reference signal bursts that is included in the DL control information. ### Claim 7 A method of wireless communication operable at a scheduling entity, comprising: communicating with a subordinate entity utilizing a plurality of self-contained subframes comprising a first subframe and a second subframe, each of the self-contained subframes comprising an uplink (UL) portion and a downlink (DL) portion; transmitting DL control information to the subordinate entity in the DL portion of the first subframe, the subordinate entity waking up from a discontinuous reception (DRX) off mode in the first subframe; receiving first UL data comprising a wake-up burst structure including a plurality of reference signal bursts from the subordinate entity in the UL portion of the first subframe, wherein the plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the first subframe; and receiving second UL data comprising a nominal number of reference signal bursts from the scheduled entity in the UL portion of the second subframe, wherein the wake-up burst structure comprises a greater number of reference signal bursts than the nominal number of reference signal bursts. ### Claim 8 (depends on 7) The method of claim 7, wherein the nominal number of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the second subframe. ### Claim 9 (depends on 7) The method of claim 7, wherein the DL control information is configured to request the subordinate entity to precode the plurality of reference signal bursts differently from one another such that the plurality of reference signal bursts are transmitted by different antennas of the subordinate entity. ### Claim 10 (depends on 7) The method of claim 7, further comprising: receiving the plurality of reference signal bursts respectively from different antennas of the subordinate entity. ### Claim 11 (depends on 7) The method of claim 7, further comprising: configuring the DL control information to indicate a predetermined periodicity of the reference signal bursts in the UL portion. ### Claim 12 (depends on 11) The method of claim 11, further comprising determining the predetermined periodicity based on at least one of: a time duration that the subordinate entity has been in a sleep mode; a link quality between the subordinate entity and the scheduling entity in a previous wake-up period; an amount of DL data scheduled to be transmitted by the scheduling entity; a delay spread of an uplink channel between the scheduling entity and the subordinate entity; or a Doppler spread of an uplink channel between the scheduling entity and the subordinate entity. ### Claim 13 (depends on 7) The method of claim 7, wherein the DL control information comprises a suggested structure of the reference signal bursts, and wherein the first UL data is configured to indicate that the reference signal bursts conform with the suggested structure. ### Claim 14 An apparatus for wireless communication, comprising: a communication interface configured to communicate with a scheduling entity; a memory comprising executable code; and a processor operatively coupled to the communication interface and the memory, wherein the processor is configured by the executable code to: communicate with the scheduling entity utilizing a plurality of self-contained subframes comprising a first subframe and a second subframe, each of the self-contained subframes comprising an uplink (UL) portion and a downlink (DL) portion; wake up from a discontinuous reception (DRX) off mode to receive DL control information from the scheduling entity in the DL portion of the first subframe; transmit first UL data comprising a wake-up burst structure including a plurality of reference signal bursts to the scheduling entity in the UL portion of the first subframe, wherein the plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the first subframe; and transmit second UL data comprising the nominal number of reference signal bursts to the scheduling entity in the UL portion of the second subframe, wherein the wake-up burst structure comprises a greater number of reference signal bursts than the nominal number of reference signal bursts. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the nominal number of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the second subframe. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein the processor is further configured to: precode the plurality of reference signal bursts differently from one another such that the plurality of reference signal bursts are transmitted by different antennas of the subordinate entity. ### Claim 17 (depends on 14) The apparatus of claim 14, wherein the processor is further configured to: wake up from a discontinuous reception (DRX) off mode during a DL-centric subframe of the plurality of self-contained subframes, wherein the DL-centric subframe is earlier in time than the second subframe; receive DL control information, from the scheduling entity, in the DL-centric subframe; and transmit UL data comprising a plurality of reference signal bursts to the scheduling entity in the UL portion of the second subframe such that the plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the second subframe. ### Claim 18 (depends on 14) The apparatus of claim 14, wherein the processor is further configured to: utilize continuous phase modulation or constant phase modulation to transmit the reference signal bursts. ### Claim 19 (depends on 14) The apparatus of claim 14, wherein the processor is further configured to: configure the UL data to indicate that the reference signal bursts conform with a suggested structure of the reference signal bursts that is included in the DL control information. ### Claim 20 An apparatus for wireless communication, comprising: a communication interface configured to communicate with a subordinate entity; a memory comprising executable code; and a processor operatively coupled to the communication interface and the memory, wherein the processor is configured by the executable code to: communicate with the subordinate entity utilizing a plurality of self-contained subframes comprising a first subframe and a second subframe, each of the self-contained subframes comprising an uplink (UL) portion and a downlink (DL) portion; transmit DL control information to the subordinate entity in the DL portion of the first subframe, the subordinate entity waking up from a discontinuous reception (DRX) off mode in the first subframe; receive first UL data comprising a wake-up burst structure including a plurality of reference signal bursts from the subordinate entity in the UL portion of the first subframe, wherein the plurality of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the first subframe; and receive second UL data comprising a nominal number of reference signal bursts from the scheduled entity in the UL portion of the second subframe, wherein the wake-up burst structure comprises a greater number of reference signal bursts than the nominal number of reference signal bursts. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the nominal number of reference signal bursts are uniformly spaced in at least a portion of the UL portion of the second subframe. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the processor is further configured to: configure the DL control information to request the subordinate entity to precode the plurality of reference signal bursts differently from one another such that the plurality of reference signal bursts are transmitted by different antennas of the subordinate entity. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein the processor is further configured to: receive the plurality of reference signal bursts respectively from different antennas of the subordinate entity. ### Claim 24 (depends on 20) The apparatus of claim 20, wherein the processor is further configured to: configure the DL control information to indicate a predetermined periodicity of the reference signal bursts in the UL portion. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the processor is further configured to determine the predetermined periodicity based on at least one of: a time duration that the subordinate entity has been in a sleep mode; a link quality between the subordinate entity and the scheduling entity in a previous wake-up period; an amount of DL data scheduled to be transmitted by the scheduling entity; a delay spread of an uplink channel between the scheduling entity and the subordinate entity; or a Doppler spread of an uplink channel between the scheduling entity and the subordinate entity. ### Claim 26 (depends on 20) The apparatus of claim 20, wherein the DL control information comprises a suggested structure of the reference signal bursts, and wherein the first UL data is configured to indicate that the reference signal bursts conform with the suggested structure.