# US 10,873,927 B2 · Decoupled mode for a common uplink burst transmission in a time division duplex subframe structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,927 B2 - Document ID: US10873927B2 - Status: Granted - Kind: B2 - Application number: 16/207,050 - Filed: 2018-11-30 - Published: 2019-04-04 - Granted: 2020-12-22 - Earliest claimed: 2015-12-09 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Wei Zeng; Joseph Binamira Soriaga; Tingfang Ji - Web page: https://patentgrep.com/patent/US10873927B2 ## CPC - H04L 5/1469: {using time-sharing} - H04B 1/707: using direct sequence modulation - H04B 7/0413: MIMO systems - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04L 1/0018: {based on latency requirement} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04L 27/2613: {Structure of the reference signals} - H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0023: {Time-frequency-space} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Various aspects of the present disclosure provide for methods, apparatus, and computer software for transmitting a common uplink burst in time division duplex (TDD) carriers. The common uplink burst includes a sounding reference signal (SRS) transmitted separate from (e.g., decoupled from) a demodulation reference signal (DM-RS). At least one symbol in the common uplink burst includes a control region for carrying control information and a data region for carrying data information. The SRS may be precoded separately from precoding of the control and data regions, so that the control and/or data information may be transmitted utilizing multiple input multiple output (MIMO). ## Claims ### Claim 1 A method operable at a subordinate entity for wireless communication over a time division duplex (TDD) carrier, the method comprising: transmitting an uplink burst within a downlink-centric subframe on the TDD carrier, wherein the uplink burst comprises: a first symbol comprising a sounding reference signal (SRS) configured to enable sounding of the TDD carrier; and a second symbol comprising information bits and a demodulation reference signal (DM-RS), wherein the DM-RS is configured to enable demodulation of the information bits carried within the second symbol. ### Claim 2 (depends on 1) The method of claim 1, wherein the second symbol comprises control information, the control information comprising one or more of channel quality information, a packet acknowledgment, a scheduling request, or combinations thereof. ### Claim 3 (depends on 2) The method of claim 2, wherein the TDD carrier comprises a plurality of resource blocks, each resource block comprising time-frequency resources including a set of subcarriers; wherein the second symbol of the uplink burst is configured with an orthogonal frequency division multiple access (OFDMA) waveform; and wherein the control information is located in a control region spanning a first portion of the subcarriers within a resource block on the TDD carrier, the first portion of the subcarriers being less than all of the subcarriers of the resource block. ### Claim 4 (depends on 3) The method of claim 3, wherein the second symbol of the uplink burst further comprises a data region spanning a second portion of the subcarriers within the resource block of the TDD carrier, the first portion and the second portion together being less than or equal to all of the subcarriers. ### Claim 5 (depends on 1) The method of claim 1, wherein the first symbol of the uplink burst is configured with a single carrier waveform; and wherein the second symbol of the uplink burst is configured with an orthogonal frequency division multiple access (OFDMA) waveform comprising a plurality of subcarriers. ### Claim 6 (depends on 1) The method of claim 1, wherein the SRS in the first symbol of the uplink burst spans all subcarriers within a resource block on the TDD carrier. ### Claim 7 (depends on 1) The method of claim 1, further comprising: applying a first precoding matrix to the SRS; and applying a second precoding matrix, different from the first precoding matrix, to the DM-RS. ### Claim 8 (depends on 1) The method of claim 1, further comprising: applying a scrambling code to the SRS, the scrambling code configured to enable code division multiple access (CDMA) among a plurality of subordinate entities. ### Claim 9 (depends on 1) The method of claim 1, further comprising: transmitting a second uplink burst within an uplink-centric subframe on the TDD carrier, wherein the second uplink burst comprises a third symbol comprising a sounding reference signal (SRS) configured to enable sounding of the TDD carrier; and a fourth symbol comprising information bits and a demodulation reference signal (DM-RS), wherein the DM-RS is configured to enable demodulation of the information bits carried within the fourth symbol. ### Claim 10 (depends on 9) The method of claim 9, wherein: the third symbol is adjacent in time to the fourth symbol and further comprising transmitting the fourth symbol in the last symbol period of the uplink-centric subframe. ### Claim 11 (depends on 9) The method of claim 9, wherein: the uplink burst is a first uplink burst and further comprising: formatting the first uplink burst according to a common uplink burst format; and formatting the second uplink burst according to the common uplink burst format. ### Claim 12 (depends on 1) The method of claim 1, wherein: the transmitting of the uplink burst within the downlink-centric subframe comprises transmitting the uplink burst in the last two symbols periods of the downlink-centric subframe. ### Claim 13 A subordinate entity configured for wireless communication over a time division duplex (TDD) carrier, the subordinate entity comprising: a transceiver; a memory; and a processor communicatively coupled to the transceiver and the memory, the processor being configured for: transmitting an uplink burst within a downlink-centric subframe on the TDD carrier, wherein the uplink burst comprises: a first symbol comprising a sounding reference signal (SRS) configured to enable sounding of the TDD carrier; and a second symbol comprising information bits and a demodulation reference signal (DM-RS), wherein the DM-RS is configured to enable demodulation of the information bits carried within the second symbol. ### Claim 14 (depends on 13) The subordinate entity of claim 13, wherein the second symbol comprises control information, the control information comprising one or more of channel quality information, a packet acknowledgment, a scheduling request, or combinations thereof. ### Claim 15 (depends on 14) The subordinate entity of claim 14, wherein the TDD carrier comprises a plurality of resource blocks, each resource block comprising time-frequency resources including a set of subcarriers; wherein the second symbol of the uplink burst is configured with an orthogonal frequency division multiple access (OFDMA) waveform; and wherein the control information is located in a control region spanning a first portion of the subcarriers within a resource block on the TDD carrier, the first portion of the subcarriers being less than all of the subcarriers of the resource block. ### Claim 16 (depends on 15) The subordinate entity of claim 15, wherein the second symbol of the uplink burst further comprises a data region spanning a second portion of the subcarriers within the resource block of the TDD carrier, the first portion and the second portion together being less than or equal to all of the subcarriers. ### Claim 17 (depends on 13) The subordinate entity of claim 13, wherein the first symbol of the uplink burst is configured with a single carrier waveform; and wherein the second symbol of the uplink burst is configured with an orthogonal frequency division multiple access (OFDMA) waveform comprising a plurality of subcarriers. ### Claim 18 (depends on 13) The subordinate entity of claim 13, wherein the SRS in the first symbol of the uplink burst spans all subcarriers within a resource block on the TDD carrier. ### Claim 19 (depends on 13) The subordinate entity of claim 13, wherein the processor is further configured for: applying a first precoding matrix to the SRS; and applying a second precoding matrix, different from the first precoding matrix, to the DM-RS. ### Claim 20 (depends on 13) The subordinate entity of claim 13, wherein the processor is further configured for: applying a scrambling code to the SRS, the scrambling code configured to enable code division multiple access (CDMA) among a plurality of subordinate entities. ### Claim 21 (depends on 13) The subordinate entity of claim 13, wherein the processor is further configured for: transmitting a second uplink burst within an uplink-centric subframe on the TDD carrier, wherein the second uplink burst comprises: a third symbol comprising a sounding reference signal (SRS) configured to enable sounding of the TDD carrier; and a fourth symbol comprising information bits and a demodulation reference signal (DM-RS), wherein the DM-RS is configured to enable demodulation of the information bits carried within the fourth symbol. ### Claim 22 (depends on 21) The subordinate entity of claim 21, wherein: the third symbol is adjacent in time to the fourth symbol and the processor is further configured for: transmitting the fourth symbol in the last symbol period of the uplink-centric subframe. ### Claim 23 (depends on 21) The subordinate entity of claim 21, wherein: the uplink burst is a first uplink burst and the processor is further configured for: formatting the first uplink burst according to a common uplink burst format; and formatting the second uplink burst according to the common uplink burst format. ### Claim 24 (depends on 13) The subordinate entity of claim 13, wherein the processor is further configured for: transmitting the uplink burst in the last two symbols periods of the downlink-centric subframe. ### Claim 25 A subordinate entity configured for wireless communication over a time division duplex (TDD) carrier, the method comprising: means for receiving downlink transmissions; and means for transmitting an uplink burst within a downlink-centric subframe on the TDD carrier, wherein the uplink burst comprises: a first symbol comprising a sounding reference signal (SRS) configured to enable sounding of the TDD carrier; and a second symbol comprising information bits and a demodulation reference signal (DM-RS), wherein the DM-RS is configured to enable demodulation of the information bits carried within the second symbol. ### Claim 26 (depends on 25) The subordinate entity of claim 25, wherein the second symbol comprises control information, the control information comprising one or more of channel quality information, a packet acknowledgment, a scheduling request, or combinations thereof. ### Claim 27 (depends on 26) The subordinate entity of claim 26, wherein the TDD carrier comprises a plurality of resource blocks, each resource block comprising time-frequency resources including a set of subcarriers; wherein the second symbol of the uplink burst is configured with an orthogonal frequency division multiple access (OFDMA) waveform; and wherein the control information is located in a control region spanning a first portion of the subcarriers within a resource block on the TDD carrier, the first portion of the subcarriers being less than all of the subcarriers of the resource block. ### Claim 28 (depends on 27) The subordinate entity of claim 27, wherein the second symbol of the uplink burst further comprises a data region spanning a second portion of the subcarriers within the resource block of the TDD carrier, the first portion and the second portion together being less than or equal to all of the subcarriers. ### Claim 29 (depends on 25) The subordinate entity of claim 25, wherein the first symbol of the uplink burst is configured with a single carrier waveform; and wherein the second symbol of the uplink burst is configured with an orthogonal frequency division multiple access (OFDMA) waveform comprising a plurality of subcarriers. ### Claim 30 (depends on 25) The subordinate entity of claim 25, wherein the SRS in the first symbol of the uplink burst spans all subcarriers within a resource block on the TDD carrier. ### Claim 31 (depends on 25) The subordinate entity of claim 25, further comprising: means for applying a first precoding matrix to the SRS; and means for applying a second precoding matrix, different from the first precoding matrix, to the DM-RS. ### Claim 32 (depends on 25) The subordinate entity of claim 25, further comprising: means for applying a scrambling code to the SRS, the scrambling code configured to enable code division multiple access (CDMA) among a plurality of subordinate entities.