CA-3062429-C - SYNCHRONIZATION SIGNAL FOR A BROADCAST CHANNEL

Abstract

An apparatus are provided for wireless communication at a base station with improved PBCH construction and decoding. The base station apparatus constructs a PBCH payload, wherein a bit location is selected for encoding a plurality of bits of the PBCH based on an estimated reliability for the corresponding bits location wherein the plurality of bits comprises frozen bits, unknown bits that are unknown to a user equipment, and potentially known bits that are potentially known by the user equipment. The apparatus transmits the PBCH payload in at least one of a plurality of SS blocks. A UE receiving the PBCH decodes the PBCH based on a successive decoding order. The successive decoding order may be based on an estimated reliability for the corresponding bits, e.g., in which potentially known bits are decoded prior to unknown bits.

Inventors

• Bilal Sadiq
• Juergen Cezanne
• Shrinivas KUDEKAR
• Navid Abedini
• Muhammad Nazmul Islam

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260505

Application Date

20180427

Priority Date

20180320

Claims (20)

1. 85721745 CLAIMS: 1. A method of wireless communication at a user equipment (UE) served by a first cell, compnsmg: receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information; receiving, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality; detecting the cell ID of the second cell from a received SS block; and decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
2. 2. The method of claim 1, wherein the successive decoding order is based on an estimated reliability for corresponding bits.
3. 3. The method of claim 1, wherein the potentially known bits further comprise system information provided to the UE by the first cell.
4. 4. The method of claim 1, wherein the PBCH payload comprises a polar coded PBCH.
5. 5. A method of wireless communication at a user equipment (UE) served by a first cell, compnsmg: receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information; detecting a cell identifier (ID) of the second cell from a received SS block; Date Re9ue/Date Received 2024-02-23 85721745 reporting the cell ID of the second cell to the first cell; receiving, from the first cell, a plurality of potentially known bits corresponding to the cell ID for the second cell in response to the reporting the cell ID; and decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
6. 6. The method of claim 5, wherein the successive decoding order is based on an estimated reliability for corresponding bits.
7. 7. The method of claim 5, wherein the potentially known bits further comprise system information provided to the UE by the first cell.
8. 8. The method of claim 5, wherein the PBCH payload comprises a polar coded PBCH.
9. 9. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising: means for receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH pay load comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information; means for receiving, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality; means for detecting a cell ID of the second cell from a received SS block; and means for decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
10. 10. The apparatus of claim 9, wherein the successive decoding order is based on an estimated reliability for corresponding bits. 31 Date Re9ue/Date Received 2024-02-23 85721745
11. 11. The apparatus of claim 9, wherein the potentially known bits further comprise system information provided to the UE by the first cell.
12. 12. The apparatus of claim 9, wherein the PBCH payload comprises a polar coded PBCH.
13. 13. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising: means for receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information; means for detecting a cell identifier (ID) of the second cell from a received SS block; means for reporting the cell ID of the second cell to the first cell; means for receiving, from the first cell, a plurality of potentially known bits corresponding to the cell ID for the second cell in response to the reporting the cell ID; and means for decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
14. 14. The apparatus of claim 13, wherein the successive decoding order is based on an estimated reliability for corresponding bits.
15. 15. The apparatus of claim 13, wherein the potentially known bits further comprise system information provided to the UE by the first cell.
16. 16. The apparatus of claim 13, wherein the PBCH payload comprises a polar coded PBCH.
17. 17. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising: a memory; and at least one processor coupled to the memory and configured to: 32 Date Re9ue/Date Received 2024-02-23 85721745 receive a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information; receive, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality; detect a cell ID of the second cell from a received SS block; and decode the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
18. 18. The apparatus of claim 17, wherein the successive decoding order is based on an estimated reliability for corresponding bits.
19. 19. The apparatus of claim 17, wherein the potentially known bits further comprise system information provided to the UE by the first cell.
20. 20. The apparatus of claim 17, wherein the PBCH payload comprises a polar coded PBCH.

Description

85721745 [0001] [0002] [0003] [0004] SYNCHRONIZATION SIGNAL FOR A BROADCAST CHANNEL BACKGROUND Field The present disclosure relates generally to communication systems, and more particularly, to synchronization signals and broadcast channels. Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (fDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCOMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (lo T) ), and other requirements. Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists 1 Date Rer;ue/Date Received 2024-02-23 WO 2018/231348 PCT/0S2018/029910 [0005] [0006] [0007] [0008] a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. In NR, multiple burst-sets, e.g., beam sweeps of L Synchronization Signal (SS) blocks, may be transmitted by a base station within a broadcast channel (BCH) transmission time interval (TTI). A burst-set may be a set of SS blocks comprising one complete beam sweep. SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. A physical broadcast channel (PBCH) payload may include encoded bits that are already known to a User Equipment (UE), such as frozen bits. The PBCH payload may include encoded bits that are potentially known to the UE, and the UE may need to decode the PBCH for only a remaining set of unknown information. Aspects presented herein improve PBCH construction at the base station and PBCH decoding performance by a UE. A base station may construct the PBCH by selecting a bit location for information based on whether the information comprises frozen bits, potentially known information, and unknown information. For example, the base station may give at least some of the potentially known bits a less reliable bit location than the unknown bits and may give the frozen bits a less reliable bit location than the potentially known bits. A UE may decode the PBCH using a successive decoding order in which potentially known bits are decoded first and at least part of the unknown bits are decoded subsequently. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at a base station. The apparatus constructs a PBCH payload, wherein a bit location is selected for encoding a plurality of bits of the PBCH based on an estimated reliability for the corresponding bits 2 WO 2018/231348 PCT/0S2018/029910 [0009] [0010] [0011] [0013] [0014] location wherein the plurality of bits comprises frozen bits, unknown bits that are unknown to a user equipment, and potentially known bits that are potentially known by the user equipment. The apparatus transmits the PBCH payload in at least one of a plurality of SS blocks. In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at a UE served by a first base station. The apparatus receives a PBCH payload of a second cell in at least one of a plurality of SS blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the user equipment, and potentially known bits that are potentially known by the user equipment. The potentially known bits may comprise system information provided to the UE by the first cell. Th