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US 2023/0421289 A1Published application
Pbch timing and aspects of polar code design
AssigneeIpla Holdings Inc.
InventorsLakshmi R. IYER, Allan Y. TSAI, Qing LI, Joseph M. MURRAY
Life of this patent
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Abstract
PBCH design may affect timing indication in a wireless network and polar code interleaver design, among other things. Mechanisms may indicate half frame timing though de-modulation reference signal sequence initialization, de-modulation reference signal mapping order, or de-modulation reference signal resource element location.
Claims17
An apparatus for wireless communication, the apparatus comprising circuitry configured to:
- obtain a physical broadcast channel, PBCH, payload, wherein the PBCH payload is generated by inserting 3 bits of a synchronization signal (SS) block index next to a half frame indication bit for a first frequency higher than a second frequency, the 3 bits of the SS block index being not inserted in the PBCH payload for the second frequency;
- scramble the PBCH payload based on a first scrambler, the scrambled PBCH payload creating a first vector, wherein the first scrambler indicates some least significant bits of a system frame number (SFN);
- polar encode the first vector to generate a second vector;
- rate match the second vector to generate a third vector;
- scramble the third vector based on a second scrambler, the scrambled third vector creating a fourth vector;
- generate the PBCH signal based on the fourth vector;
- obtain a demodulation reference signal (DMRS) sequence, wherein the DMRS sequence is generated by using a sequence generator initialized with a cell identifier and 2 or 3 least significant bits of the SS block index, wherein the DMRS sequence is generated by using the sequence generator initialized with 2 least significant bits of the SS block timing index for a first subcarrier spacing (SCS) and the DMRS sequence is generated by using the sequence generator initialized with 3 least significant bits of the SS block timing index for a second SCS being higher than the first SCS;
- generate a DMRS based on the DMRS sequence;
- and
- transmit a SS block comprising the PBCH signal and the DMRS based at least in part on the SS block index.
7 more elements
A method for wireless communication, the method comprising:
- obtaining a physical broadcast channel, PBCH, payload, wherein the PBCH payload is generated by inserting 3 bits of a synchronization signal (SS) block index next to a half frame indication bit for a first frequency higher than a second frequency, the 3 bits of the SS block index being not inserted in the PBCH payload for the second frequency;
- scrambling the PBCH payload based on a first scrambler, the scrambled PBCH payload creating a first vector, wherein the first scrambler indicates some least significant bits of a system frame number (SFN);
- polar encoding the first vector to generate a second vector;
- rate matching the second vector to generate a third vector;
- scrambling the third vector based on a second scrambler, the scrambled third vector creating a fourth vector;
- generating the PBCH signal based on the fourth vector;
- obtaining a demodulation reference signal (DMRS) sequence, wherein the DMRS sequence is generated by using a sequence generator initialized with a cell identifier and 2 or 3 least significant bits of the SS block index, wherein the DMRS sequence is generated by using the sequence generator initialized with 2 least significant bits of the SS block timing index for a first subcarrier spacing (SCS) and the DMRS sequence is generated by using the sequence generator initialized with 3 least significant bits of the SS block timing index for a second SCS being higher than the first SCS;
- generating a DMRS based on the DMRS sequence;
- and
- transmitting a SS block comprising the PBCH signal and the DMRS based at least in part on the SS block index.
7 more elements
An apparatus for wireless communication, the apparatus comprising circuitry configured to:
- receive, from a network node, a synchronization signal (SS) block comprising a physical broadcast channel (PBCH) signal and a demodulation reference signal (DMRS),
- wherein the PBCH signal is generated based on a fourth vector created by scrambling a third vector based on a second scrambler,
- wherein the third vector is generated by rate matching the second vector, the second vector being generated by polar encoding a first vector created by scrambling a PBCH payload based on a first scrambler, the PBCH payload being generated by inserting 3 bits of the SS block timing index next to a half frame indication bit for a first frequency higher than a second frequency, the 3 bits of the SS block index being not inserted in the PBCH payload for the second frequency, wherein the first scrambler indicates some least significant bits of a system frame number (SFN), and
- wherein the DMRS is generated based on a DMRS sequence, wherein the DMRS sequence is generated by using a sequence generator initialized with a cell identifier and 2 or 3 least significant bits of the SS block timing index, wherein the DMRS sequence is generated by using the sequence generator initialized with 2 least significant bits of the SS block timing index for a first subcarrier spacing (SCS) and the DMRS sequence is generated by using the sequence generator initialized with 3 least significant bits of the SS block timing index for a second SCS being higher than the first SCS;
- and
- perform a synchronization process with the network node based at least in part on the SS block timing index.
3 more elements
Dependencies are inferred from the claim text.