Qualcomm Incorporated

Saket Bathwal

Gang Xiao

Shailesh Maheshwari

Rudhir Varna Upretee

Leena Zacharias

Dominique Francois Bressanelli

Deepak Sah

Peng Wu

Vishal Dalmiya

Xing Chen

Xiaojian Long

Haiqin Liu

Arnaud Meylan

Arvind Vardarajan Santhanam

Sitaramanjaneyulu Kanamarlapudi

Liangchi Hsu

Vaishakh Rao

Arun Prasanth Balasubramanian

Raghuveer Ramakrishna Srinivas Tarimala

Sivashankar Sekar

Venukant Sahu

Ozcan Ozturk

Kuo-Chun Lee

Aziz Gholmieh

Prasad Reddy Kadiri

Bao Vinh Nguyen

Scott Hoover

Feilu Liu

Navid Ehsan

Vinay Paradkar

Subashini Krishnamurthy

Thomas James Christol

Ashwin Raman

Nagamanikandan Sivakumar

Vinay Rajkumar Patil

Yuyi Li

Ambuj Agrawal

Mohammed Al Khairy

Ching Ho Weng

Sapna Chittoor Brahmanandam

Srikanth Sallabathula

A receiving device re-establishing a packet data convergence protocol (PDCP) entity. The receiving device resets a robust header compression (ROHC) context. The receiving device receives packet retransmissions having header compression based on the ROHC. The receiving device performs decompression of the packet retransmissions. The receiving device discards duplicate packets after performing the decompression of the packet retransmissions.

Robust header compression handling during packet data convergence protocol re-establishment

A second wireless device may transmit, to a first wireless device, a feedback message indicative of a transition from a first compression state to a second compression state. The first wireless device may transition, based on a state change indication corresponding to the feedback message, from the first compression state to the second compression state. The first wireless device may transmit, to the second wireless device based on the transition from the first compression state to the second compression state, one or more first data packets that are previously compressed based on the first compression state or one or more second data packets that are uncompressed or recompressed based on the second compression state. The one or more second data packets being associated with the one or more first data packets.

Transmission of previously compressed packets to avoid throughput drop

Methods, systems, and devices for wireless communications are described. A communication device, otherwise known as a user equipment (UE) may transmit a data transmission to a receiver. In some examples, the data transmission may be a radio link control (RLC) protocol data unit (PDU) transmission. The UE may store the data transmission in a retransmission buffer, and transmit a feedback request to the receiver in a subsequent data transmission based on a system memory utilization threshold for the retransmission buffer being satisfied due to storage of the data transmission.

System memory flow management

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, a control message indicating a resource configuration for uplink and downlink transmissions. The UE may determine an uplink buffer threshold for a modem buffer of the UE based on the resource configuration. The UE may transmit, to the base station, a feedback request message requesting that the base station provide feedback for at least one previously transmitted uplink packet based on a comparison of an amount of previously transmitted uplink data and scheduled uplink data stored in the modem buffer relative to the uplink buffer threshold. The UE may receive, based on transmitting the feedback request message, a feedback response message corresponding to a first previously transmitted uplink packet of the at least one previously transmitted uplink packet.

Controlling modem memory used by uplink data

A wireless device with dual connectivity may transmit split bearer traffic including a plurality of compressed data packets respectively to a first RLC entity of a first base station and a second RLC entity of a second base station and measure BLERs of the transmitted split bearer traffic. Based on the measured BLERs of the transmitted split bearer traffic, the wireless device may transmit uncompressed data packets to one or more of the first RLC entity or the second RLC entity. The wireless device may also reset a context memory and transmit the uncompressed data packets to the first RLC entity and the second RLC entity. A base station with dual connectivity may configure an LTE RLC entity with an RLC out-of-order delivery to deliver the received compressed data packets to an NR-PDCP entity without reordering the compressed data packets at the LTE RLC entity.

Method and apparatus for decompression failure of transmission of split compressed data packet

In one aspect, a method of wireless communication includes determining a number of bytes in a compressed queue and a number of bytes in an uncompressed queue. The method also includes transmitting a buffer status report (BSR) indicating at least the number of bytes in the compressed queue. The method includes receiving an uplink grant indicating one or more uplink grant resources and a number of bytes allocated for the one or more uplink grant resources. The method also includes generating a transport block (TB) based on the uplink grant and the BSR and from data of at least the compressed queue, wherein the TB includes one or more compressed packets and one or more uncompressed packets. The method further includes transmitting a PUSCH transmission including the TB during an uplink grant resource of the one or more uplink grant resources. Other aspects and features are also claimed and described.

Packet compression enhancements

A method and apparatus for prioritizing data packets when stateful compression is enabled for wireless communications is disclosed. For example, the aspects include receiving a plurality of data packets scheduled in a first order for transmission. The described aspects further include prioritizing one or more data packets of the plurality of data packets as one or more prioritized data packets, each prioritized data packet being scheduled in an order for transmission different from the first order for transmission. The described aspects further include compressing one or more unprioritized data packets of the plurality of data packets into one or more compressed unprioritized data packets. The described aspects further include scheduling the one or more prioritized data packets and the one or more compressed unprioritized data packets in a second order for transmission, the second order differing from the first order.

Prioritizing data packets when stateful compression is enabled

Methods, systems, and devices for wireless communications are described. In a wireless communications system, a user equipment (UE) may receive a set of packets having a sequential order. The UE may initiate a first packet data convergence protocol (PDCP) reordering timer based on a first time stamp corresponding to unsuccessful decoding of a first packet in the sequential order. The UE may then initiate, prior to the expiration of the first PDCP reordering timer, a second PDCP reordering timer. The second PDCP reordering timer may be based on a second time stamp corresponding to unsuccessful decoding of a second packet in the sequential order. In some cases, the UE may initiate the second PDCP reordering timer after expiration of the first PDCP reordering timer, but may decrease the duration of the second PDCP reordering timer.

Multiple timers for effective reordering

In wireless communication, uplink communication by a wireless communication system user equipment may include providing data packets by a data source in the user equipment, detecting a pattern relating to uplink transmission of the plurality of data packets, and scheduling transmission of the plurality of data packets by the user equipment. One or more aspects of scheduling transmission of the plurality of data packets may be based on the detected pattern.

Systems and methods for uplink data scheduling in wireless communication systems

Various aspects of the disclosure relate to techniques for handling out-of-order grants. For example, upon detection of an out-of-order grant, the best scheduling policy for handling the out-of-order grants may be selected based on at least one traffic condition. In some aspects, a scheduling policy may involve canceling and regenerating out-of-order grants. In some aspects, a scheduling policy may involve reordering data units. In some aspects, a scheduling policy may involve designating a reorder time window.

Scheduling policies for out-of-order grants

Certain aspects of the present disclosure generally relate to wireless communications. In some aspects, a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, transmitter device, and wireless communication device are presented for unidirectional robust header compression (RoHC). The transmitter device may identify a system resource condition of at least one of the transmitter device or a receiver device of one or more data units, configure robust header compression in a single direction for wireless communication of the one or more data units between the transmitter device and the receiver device, and/or process the data units based at least in part on configuring the robust header compression. Numerous other aspects are provided.

Techniques and apparatuses for unidirectional robust header compression

Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter device may determine a completion of a handover or a radio link failure after transmitting a set of physical data units (PDUs). The transmitter device may retransmit a PDU, of the set of PDUs, after completion of the handover or the radio link failure to enable decompression of the set of PDUs. A receiver device may receive the retransmitted PDU. The receiver device may decompress the set of PDUs based at least in part on receiving the retransmitted PDU. Numerous other aspects are provided.

Techniques and apparatuses for compression enabled bearer management

Methods, systems, and devices for wireless communication are described. Different robust header compression (RoHC) schemes may be used when a change in a header extension flag between packets of a communication session is determined. For example, a transmitting device may determine a value of a header extension flag in a packet has changed with respect to header extension flags in preceding packets. Upon detecting the change in the header extension flag, the device may compress the header using different RoHC schemes. For instance, the device may compress the header by reverting to an initialization and refresh (IR) state. Additionally or alternatively, the device may compress the header using a compression profile that refrains from compressing a certain portion of the header. In some cases, the RoHC scheme used for compressing the header may be based on how frequently the value of the extension flag changes between packets.

Robust header compression (RoHC) techniques for a dynamically changing extension bit

A recovery mechanism for robust header compression (ROHC) is disclosed for wireless communication systems. The ROHC recovery mechanism may allow a receiver and/or transmitter in the wireless systems to establish or reestablish a context of a packet transmission session when an initialization and refresh message is lost. In the ROHC recovery mechanism, upon receiving a compressed packet that is not associated with a context, a receiver sends a message to a transmitter suggesting the transmitter to transition to another mode. Upon receiving a subsequent packet transmission that is not associated with a context, the receiver sends another message indicating that a context has not been established or has been lost. The transmitter may then send the receiver necessary information to establish a context for the packet transmission session.

Recovery mechanism for ROHC with lost initialization and refresh messages

Methods, systems, and devices may implement a header repair mechanism to deal with a loss of successive compressed headers (e.g., due to radio interface). The present methods and apparatus exploit the fact that once a correct timestamp (TS) from a previous decompression success (called 'last successfully decomp_TS') is known, another (e.g., a subsequent) TS should be in the form: last successfully decomp_TS+n*min_TS_STRIDE, where n is a positive integer if the estimated sequence number (SN) is higher than the last successfully decompressed SN, and a negative integer if the estimated SN is lower than the last successfully decompressed SN, and min_TS_STRIDE is the expected minimum TS increment, which is known and directly related to the medium sample rate and frame rate, for example.

Growing community of inventors

Hyderabad Telangana, India

Saket Bathwal