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EP-3633894-B1 - TRANSPORT BLOCK SEGMENTATION AND SIGNALING

EP3633894B1EP 3633894 B1EP3633894 B1EP 3633894B1EP-3633894-B1

Inventors

  • LUO, TAO
  • MANOLAKOS, Alexandros
  • SORIAGA, Joseph, Binamira
  • MUKKAVILLI, KRISHNA, KIRAN

Dates

Publication Date
20260506
Application Date
20160826

Claims (14)

  1. A method for wireless communications, comprising: receiving, via a control channel, a reference number of tones for an overhead channel based at least in part on a communication link direction associated with the overhead channel, wherein the communication link direction comprises uplink, downlink or sidelink, and wherein the tones for the overhead channel are in a data region which is used for transmitting the transport block; determining a number of resources available for data transmission based at least in part on the reference number of tones for the overhead channel; determining a number of code blocks, CB, based at least on a CB size and on the number of resources available, determining a size of a transport block based at least in part on the number of CBs and the CB size; segmenting the transport block into at least one code block based at least in part on the size of the transport block; and communicating the at least one code block over a communication link.
  2. The method of claim 1, wherein the determining the size of the transport block is further based on a modulation order and coding scheme, MCS, indicator.
  3. The method of claim 1, wherein the reference number of tones for the overhead channel is associated with a channel state information reference signal, CSI-RS.
  4. The method of claim 1, wherein the reference number of tones for the overhead channel is associated with one or more of a control channel in a data region of the transport block, a synchronization channel, a maximum number of resources associated with the overhead channel, a minimum number of resources associated with the overhead channel, or a median number of resources associated with the overhead channel.
  5. The method of claim 1, further comprising determining a first number of information bits for the transport block based at least in part on a number of code blocks associated with the transport block and a second number of information bits for the code blocks.
  6. The method of claim 5, further comprising determining the second number of information bits for the code blocks based at least in part on a code block size and a code rate.
  7. The method of claim 5, further comprising determining the number of code blocks associated with the transport block based at least in part on a number of resource blocks allocated for the transport block and the reference number of tones for the overhead channel.
  8. The method of claim 1, further comprising determining a number of pad bits for the transport block based at least in part on an actual number of tones associated with the overhead channel.
  9. The method of claim 1, further comprising determining a number of punctured bits for the at least one code block based at least in part on an actual number of tones associated with the overhead channel.
  10. The method of claim 9, further comprising: identifying a plurality of tone bundles associated with the at least one code block; determining an interleaver matrix based at least in part on the number of punctured bits for the at least one code block; and interleaving the plurality of tone bundles according to the interleaver matrix.
  11. The method of claim 1, further comprising: determining an interleaver matrix based at least in part on the reference number of tones for the overhead channel; and interleaving a plurality of resources of the at least one code block according to the interleaver matrix.
  12. The method of claim 11, wherein interleaving the plurality of resources comprises: writing the plurality of resources to elements of the interleaver matrix according to a first order; and reading the elements of the interleaver matrix according to a second order.
  13. An apparatus for wireless communications, comprising: a processor; and memory coupled to the processor, wherein the processor is configured to: receive, via a control channel, a reference number of tones for an overhead channel based at least in part on a communication link direction associated with the overhead channel, wherein the communication link direction comprises uplink, downlink or sidelink, and wherein the tones for the overhead channel are in a data region which is used for transmitting the transport block; determine a number of resources available for data transmission based at least in part on the reference number of tones for the overhead channel; determine a number of code blocks, CB, based at least on a CB size and on the number of resources available, determine a size of a transport block based at least in part on the number of CBs and the CB size; segment the transport block into at least one code block based at least in part on the size of the transport block; and communicate the at least one code block over the communication link.
  14. The apparatus of claim 13, wherein the processor is further configured to carry out the method of any one of claims 2 to 12.

Description

CROSS REFERENCES The present Application for Patent claims priority to U.S. Patent Application No. 15/178,957 by Luo et al., entitled, "Transport Block Segmentation and Signaling," filed June 10, 2016; and U.S. Provisional Patent Application No. 62/250,420 by Luo et al., entitled "Transport Block Segmentation and Signaling," filed November 3, 2015; and U.S. Provisional Patent Application No. 62/261,820 by Luo et al., entitled "Transport Block Segmentation and Signaling," filed December 1, 2015; each of which is assigned to the assignee hereof. BACKGROUND The following relates generally to wireless communication, and more specifically to transport block (TB) segmentation and signaling. Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, power, etc.). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, and orthogonal frequency division multiple access (OFDMA) systems. A wireless multiple-access communications system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). In some deployments, UEs and base stations may rely on retransmissions of data in TBs in order to successfully receive and decode transmitted data. For example, a UE may generate feedback, such as an acknowledgment (ACK) or a negative acknowledgment (NACK) signal, which may be transmitted to the transmitting device, such as a base station, to indicate whether a TB was successfully received and decoded, which may prompt the transmitting device to retransmit the TB (e.g., in case of a NACK feedback). In some cases, TBs may include a number of code blocks (CBs) that are transmitted by a UE or a base station. CB sizes within a TB may be determined by a number of factors, such as a size of the TB, coding rate, modulation order, or interleaver characteristics, among others. Patent US 6337642 B relates to a method for efficient interleaving of variable-length packets. In packet networks, block interleaving of variable-length packets can be inefficient when the interleaver block size is fixed and smaller than the packet size. For certain packet lengths, the remaining number of elements for the last block (i.e., bytes or symbols) can be very low. It is provided a way to calculate the optimal interleaver block sizes for a preselected packet length and a preselected interleaver width. Patent application US 2014/0204878 relates to transmitting or receiving channel quality control information through a physical uplink shared channel in a wireless access system that supports hybrid automatic retransmit request. The method may include receiving a PDCCH signal including an initial uplink grant, transmitting uplink data using two transport blocks based on the initial uplink grant, receiving a NACK information for one of the two transport blocks, and transmitting a channel quality control information along with the one ofthe two transport blocks which is retransmitted according to the NACK information or a new transport block through the PUSCH to which the HARQ is applied. The patent application WO 2014/088294 Al discloses that when CSI is multiplexed with uplink data on the same data channel, the number of available resource elements REs can be obtained by subtracting the number of REs occupied by the CSI. Based on the number of available on REs, the TB size for the data transmission is determined. SUMMARY The invention is defined by the appended independent claims 1 and 13 with further embodiments according to the dependent claims. The present disclosure, for example, relates to techniques for transport block (TB) segmentation and signaling in wireless communication systems. Various aspects of the disclosure provide segmentation of a TB into one or more code blocks (CBs). The number of CBs into which a TB is segmented may be determined based on a reference number of tones of an overhead channel. For example, if an overhead channel is allocated one or more resource blocks (RBs) in a subframe during retransmission of a TB, the TB may be segmented into one or more CBs based on the number of RBs allocated for the overhead channel. In certain examples, based at least in part on the reference number of tones of the overhead channel, the number of CBs may be determined for retransmission of the TB. In examples where a TB is segmented into one or more CBs, the one or more CBs may be transmitted from a transmitting device to a receiving device. In some examples, a CB size indicator or the reference number of tones may be optionally transmitted to the receivin