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KR-102962932-B1 - Coordinated Beam Selection in Cellular Mesh Networks

KR102962932B1KR 102962932 B1KR102962932 B1KR 102962932B1KR-102962932-B1

Abstract

These are methods and devices for maintaining network information. A method for operating a base station (BS) in a wireless communication network includes the steps of receiving a neighbor discovery signal block (NDSB) from a neighbor BS in the wireless communication network, generating measurement information based on the NDSB, and generating a path metric for the neighbor BS based on the generated measurement information. The method further includes the steps of determining whether the neighbor BS is an interfering neighbor BS based on a comparison of the path metric and a threshold, and updating network information maintained in the BS based on the determination of whether the neighbor BS is an interfering neighbor BS.

Inventors

  • 라트남 비슈누 바르단
  • 전정호
  • 조준영

Assignees

  • 삼성전자주식회사

Dates

Publication Date
20260508
Application Date
20200207
Priority Date
20200206

Claims (15)

  1. In a base station (BS) in a wireless communication network, Transmitter/receiver; and It includes at least one processor coupled to the above-mentioned transmitting and receiving unit, and The above-mentioned at least one processor is, Receive a neighbor discovery signal from a neighbor BS, and Measurement information is obtained by performing measurements on transmitting and receiving beam pairs between the BS and the neighbor BS based on a reference signal included in the neighbor discovery signal, and Based on the above measurement information and the information included in the neighbor discovery signal, a path metric for the transmitting and receiving beam pair is obtained, and Based on the path metric for the transmitting and receiving beam pairs, determine whether the neighbor BS is an interfering neighbor BS, and A BS that updates network information based on a determination of whether the above neighbor BS is the above interfering neighbor BS.
  2. delete
  3. In Article 1, BS, which updates network information maintained in a table comprising at least one of a BS identifier, an identifier for the transmitting and receiving beam pair, and a path metric for the transmitting and receiving beam pair.
  4. In Paragraph 3, The above-mentioned at least one processor is, Send the above table or an update to the above table to the network entity, and A BS that receives routing and scheduling information for data transmission and reception by the BS from the above network entity.
  5. In Paragraph 4, The above table includes an interference table and a candidate parent table, and The above routing and scheduling information is a BS determined to reduce BS neighbor interference based on a collision graph for a transmitting and receiving beam pair in the interference table and a transmitting and receiving beam pair in the candidate parent table.
  6. In Article 1, The above-mentioned at least one processor is, Receive a second neighbor discovery signal from the second neighbor BS, and Based on the above second neighbor discovery signal, second measurement information is obtained, and Based on the second measurement information above, a second path metric for the second neighbor BS is obtained, and Based on the second path metric above, determine whether the second neighbor BS is a candidate parent BS, and Based on the determination that the above second neighbor BS is the above candidate parent BS: Determine a transmitting and receiving beam pair for connection with the above-mentioned second neighbor BS, and Update the above network information, and Compare the second path metric for the above candidate parent BS with the path metric for the current parent BS of the above BS, and A handover to the candidate parent BS is performed based on the second path metric for the candidate parent BS that exceeds the path metric for the current parent BS of the above BS by a third threshold, and The above third threshold is fixed or adaptive, BS.
  7. In Article 1, The above network information includes a beam identifier for the beam of the interfering neighbor BS in the interference table, and The above-mentioned at least one processor is, Determining the resources to use for a beam that does not have the interfering neighbor BS in the above interference table, and By determining the resources to be used through opportunistic transmission or low code rate transmission for the beam having the interferer neighbor BS in the above interference table, A BS that identifies the resources to be used by the BS based on the beam identifier for the beam of the aforementioned interfering neighbor BS.
  8. In Article 1, The above network information includes a list of interfering neighbor BSs, and The above-mentioned at least one processor is, Determine the resources that the above BS will use, and Transmit an interference avoidance request (IAREQ) message including a first interference avoidance request for the determined resource to the interfering neighbor BS in the list, and Receive an IAREQ message including a second interference avoidance request from a neighbor BS, and Based on the information in the IAREQ message, the transmission pattern of the BS, and the beam priority level for the beam of the BS, it is determined whether the BS will comply with the second interference avoidance request, and Send an interference avoidance response (IAREP) message to the neighboring BS indicating whether the BS will comply with the second interference avoidance request, and The above-mentioned interfering neighbor BS receives an IAREP message indicating whether it will comply with the above-mentioned first interference avoidance request, and BS identifying the resources used by the BS based on the decision of whether to comply with the second interference avoidance request.
  9. In Article 8, The above-mentioned at least one processor is, BS, which determines whether to use the determined resource through opportunistic transmission or low code rate transmission in response to the reception of the IAREP message indicating non-compliance with the first interference avoidance request.
  10. In Article 8, The above-mentioned at least one processor is, In response to the receipt of the IAREP message indicating non-compliance with the first interference avoidance request, Switching the above transmitting and receiving beam pairs to alternative beam transmitting and receiving pairs having reduced interference, Switching to a different parent BS, Transmitting at a low coding rate in protection mode, BS configured to perform at least one of channel sensing prior to transmission and performing random or deterministic backoff depending on link priority or data service quality class.
  11. In a method performed by a base station (BS) in a wireless communication network, Step of receiving a neighbor discovery signal from a neighbor BS; A step of obtaining measurement information by performing measurements on a transmitting and receiving beam pair between the BS and the neighbor BS based on a reference signal included in the neighbor discovery signal; A step of obtaining a path metric for the transmitting and receiving beam pair based on the above measurement information and information included in the neighbor discovery signal; A step of determining whether the neighbor BS is an interfering neighbor BS based on the path metric for the transmitting and receiving beam pair; and A method comprising the step of updating network information based on a determination of whether the neighbor BS is the interfering neighbor BS.
  12. delete
  13. In Article 11, A step of receiving a second neighbor discovery signal from a second neighbor BS; A step of obtaining second measurement information based on the second neighbor discovery signal; A step of obtaining a second path metric for the second neighbor BS based on the second measurement information; A step of determining whether the second neighbor BS is a candidate parent BS based on the second path metric; and Based on the determination that the above second neighbor BS is the above candidate parent BS: A step of determining a transmitting and receiving beam pair for connection with the second neighbor BS; Step of updating the above network information; A step of comparing the second path metric for the candidate parent BS with the path metric for the current parent BS of the BS; and The method further includes the step of performing a handover to the candidate parent BS based on the second path metric for the candidate parent BS that exceeds the path metric for the current parent BS of the BS by a third threshold, The above third threshold is fixed or adaptive, method.
  14. In Article 11, The above network information includes a beam identifier for the beam of the interfering neighbor BS in the interference table, and The above method is, Determining the resources to use for beams that do not have an interfering neighbor BS in the above interference table, and By determining the resources to be used through opportunistic transmission or low code rate transmission for the beam having the interferer neighbor BS in the above interference table, A method further comprising the step of identifying a resource to be used by the BS based on the beam identifier for the beam of the interfering neighbor BS.
  15. In Article 11, The above network information includes a list of interfering neighbor BSs, and The above method is, A step of determining the resources to be used by the above BS; A step of transmitting an interference avoidance request (IAREQ) message, including a first interference avoidance request for the determined resource, to the interfering neighbor BS in the list; A step of receiving an IAREQ message including a second interference avoidance request from a neighbor BS; A step of determining whether the BS will comply with the second interference avoidance request based on information in the IAREQ message, the transmission pattern of the BS, and the beam priority level for the beam of the BS; A step of transmitting an interference avoidance response (IAREP) message to the neighboring BS indicating whether the BS will comply with the second interference avoidance request; The step of receiving an IAREP message indicating whether the above-mentioned interfering neighbor BS will comply with the above-mentioned first interference avoidance request; and A method further comprising the step of identifying the resources used by the BS based on the decision of whether to comply with the second interference avoidance request.

Description

Coordinated Beam Selection in Cellular Mesh Networks The present disclosure generally relates to wireless communication systems, and more specifically, to beam selection coordination in cellular mesh networks. Efforts have been made to develop improved 5th generation (5G) or pre-5G communication systems to meet the demands for increased wireless data traffic following the deployment of 4th generation (4G) communication systems. 5G or pre-5G communication systems are also referred to as 'beyond 4G networks' or 'post-LTE (post long term evolution) systems'. 5G communication systems are thought to be implemented in higher frequency (mmWave) bands, such as the 60 GHz band, to achieve higher data rates. To reduce signal loss and extend transmission distance, beamforming, massive MIMO (multiple-input multiple-output), FD-MIMO (full-dimensional MIMO), array antennas, analog beamforming, and massive antenna techniques are discussed for 5G communication systems. In addition, in 5G communication systems, development is underway to improve system networks based on next-generation small cells, cloud RANs (radio access networks), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving networks, cooperative communication, coordinated multi-point (CoMP), receiver interference cancellation, etc. In 5G systems, hybrid frequency shift keying (FSK), Feher's quadrature amplitude modulation (FQAM), and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) have been developed as advanced access technologies. The Internet, a human-centered connectivity network where humans generate and consume information, is now evolving into the Internet of Things (IoT), where distributed entities such as objects exchange and process information without human intervention. The Internet of Everything (IoE) has emerged as a combination of IoT technology connected to cloud servers and big data processing technology. As technological elements such as "sensing technology," "wired/wireless communication and network infrastructure," "service interface technology," and "security technology" are required for IoT implementation, sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) are currently being researched. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between connected objects. IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart or connected vehicles, smart grids, healthcare, smart home appliances, and next-generation medical services through the convergence and combination of existing information technology (IT) and various industrial applications. In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communication can be implemented by beamforming, MIMO, and array antennas. The application of Cloud RAN as the big data processing technology described above can also be considered as an example of convergence between 5G technology and IoT technology. As explained above, various services can be provided as wireless communication systems develop, and therefore, a method to easily provide these services is required. For a more complete understanding of the present disclosure and its merits, the following description, taken in conjunction with the accompanying drawings in which similar reference numbers indicate similar parts, will now be mentioned, among which: FIG. 1 illustrates an exemplary wireless network according to embodiments of the present disclosure; FIG. 2 illustrates an exemplary gNB according to embodiments of the present disclosure; FIG. 3 illustrates an exemplary UE according to embodiments of the present disclosure; FIG. 4 illustrates an exemplary transmitter structure using OFDM according to embodiments of the present disclosure; FIG. 5 illustrates an exemplary receiver structure using OFDM according to embodiments of the present disclosure; FIG. 6 illustrates an exemplary encoding process for a DCI format according to embodiments of the present disclosure; FIG. 7 illustrates an exemplary decoding process for a DCI format for use with a UE according to embodiments of the present disclosure; FIG. 8 illustrates an exemplary fiber and BS development according to embodiments of the present disclosure; FIG. 9 illustrates an exemplary multi-hop wireless backhaul mesh network according to embodiments of the present disclosure; FIG. 10 illustrates an example of a new mesh BS discovery in a wireless backhaul mesh network according to embodiments of the present disclosure; FIG. 11 illustrates an exemplary transmission timing structure for a dedicated measur