# US 2019/0174554 A1 · Distributed control in wireless systems

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- Number: US 2019/0174554 A1
- Document ID: US20190174554A1
- Status: Published application
- Kind: A1
- Application number: 16/099,390
- Filed: 2017-05-11
- Published: 2019-06-06
- Earliest claimed: 2016-05-11
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Yugeswar DEENOO; Ghyslain PELLETIER; Ping Hsuan TAN; Martino M FREDA
- Web page: https://patentgrep.com/patent/US20190174554A1

## CPC

- H04W 74/0841: {with collision treatment}
- H04B 7/0408: using two or more beams, i.e. beam diversity
- H04B 7/0617: {for beam forming}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands}
- H04W 8/22: Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 48/14: using user query {or user detection}
- H04W 56/001: {Synchronization between nodes}
- H04W 68/005: {Transmission of information for alerting of incoming communication}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 76/11: Allocation or use of connection identifiers
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 80/02: Data link layer protocols
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Systems, procedures, and instrumentalities are disclosed for distributed control in wireless systems, such as 5G flexible radio access technology (RAT) (5gFLEX). Example procedures are provided for WTRU and network operation associated with a distributed control plane architecture, connectionless data transfer and dedicated system information acquisition. Distributed control may be provided, for example, by replicating a plurality of access control functions (ACFs) using a plurality of instances in a plurality of different transmission/reception points (TRPs) with multi-connectivity. The plurality of TRPs may concurrently provide control services to a WTRU. Centralized control functions may manage core network connectivity and/or a plurality of user plane instances for the WTRU and/or may facilitate coordination between the plurality of ACF instances for the WTRU in the plurality of different TRPs of the WTRU's configuration.

## Claims

### Claim 1

A wireless transmit/receive unit (WTRU) in communication with a communication network, the WTRU comprising:
a memory;
a processor, the processor configured at least to:
determine to request one or more system information (SI) messages from the communication network; and
determine if a transmission of the one or more SI message from the communication network will utilize at least one beamformed communication based on one or more communication parameters; and
a transceiver, the transceiver configured at least to:
receive at least one of the one or more SI messages from the communication network via the at least one beamformed communication.

### Claim 2 (depends on 1)

The WTRU of claim 1, wherein the one or more communication parameters include a frequency band of the transmission, the processor being further configured to:
compare the frequency band of the transmission to a predetermined threshold; and
determine that the transmission of the one or more SI messages from the communication network utilizes at least one beamformed communication based on the frequency band of the transmission exceeding the predetermined threshold.

### Claim 3 (depends on 1)

The WTRU of claim 1, wherein the one or more communication parameters include a characteristic of a downlink signal, the transceiver being further configured to:
receive the downlink signal, the processor being further configured to:
identify the characteristic of the downlink signal; and
determine that the transmission of the one or more SI messages from the communication network utilizes at least one beamformed communication based on the identified characteristic of the downlink signal.

### Claim 4 (depends on 3)

The WTRU of claim 3, wherein the downlink signal includes a reference signal.

### Claim 5 (depends on 4)

The WTRU of claim 4, wherein the characteristic of the downlink signal includes one or more of: a type of the reference signal, a system signature, a root signature, a basis sequence, or one or more predefined sequence numbers.

### Claim 6 (depends on 5)

The WTRU of claim 5, wherein the type of the reference signal is a synchronization signal.

### Claim 7 (depends on 1)

The WTRU of claim 1, wherein the one or more communication parameters include information provided in a broadcast message, the transceiver being further configured to:
receive the broadcast message, the processor being further configured to:
identify the information in the broadcast message; and
determine that the transmission of the one or more SI messages from the communication network utilizes at least one beamformed communication based on the information in the broadcast message.

### Claim 8 (depends on 7)

The WTRU of claim 7, wherein the information provided in the broadcast message is included in at least one of: a master system information block (MIB), or a system information block (SIB), or a system information message.

### Claim 9 (depends on 1)

The WTRU of claim 1, wherein the one or more communication parameters include a quality of a downlink signal, the transceiver being further configured to:
receive the downlink signal, the processor being further configured to:
measure a quality of the downlink signal; and
determine that the transmission of the one or more SI messages from the communication network utilizes at least one beamformed communication based on the quality of the downlink signal being below a predetermined threshold.

### Claim 10 (depends on 9)

The WTRU of claim 9, wherein the downlink signal includes a reference signal, and the quality of the downlink signal includes a received power of a reference signal.

### Claim 11 (depends on 1)

The WTRU of claim 1, wherein the processor is further configured to initiate an uplink (UL) request to the communication network for the one or more SI messages.

### Claim 12

A wireless transmit/receive unit (WTRU) in communication with a communication network, the WTRU comprising:
a memory;
a processor, the processor configured at least to:
determine to request one or more system information (SI) messages from the communication network;
conduct a beam sweep operation of one or more downlink (DL) beams transmitted from the communication network;
identify at least one DL beam of the one or more DL beams via which to receive the one or more on-demand SI messages based at least in part on the beam sweep operation;
determine one or more uplink (UL) resources with which to communicate information for a WTRU reception of the one or more on-demand SI messages, the information for the WTRU reception including the at least one DL beam; and
initiate the request for the one or more on-demand SI messages from the communication network; and
a transceiver, the transceiver configured at least to:
send the request for the one or more on-demand SI messages to the communication network using the one or more UL resources, the request including the information for the WTRU reception of the one or more on-demand SI messages; and
receive at least one of the one or more on-demand SI messages from the communication network via the at least one DL beam.

### Claim 13 (depends on 12)

The WTRU of claim 12, wherein the one or more UL resources are mapped to the at least one DL beam.

### Claim 14 (depends on 12)

The WTRU of claim 12, wherein the processor is further configured such that the one or more UL resources are determined based on at least one of: the at least one DL beam of the one or more DL beams, a mapping between the one or more UL resources and the at least one DL beam of the one or more DL beams, or the requested one or more on-demand SI messages

### Claim 15 (depends on 12)

The WTRU of claim 12, wherein the processor is further configured such that the request for the one or more on-demand SI messages is sent as part of a Random Access Channel (RACH) transmission.

### Claim 16 (depends on 12)

The WTRU of claim 12, wherein the processor is further configured such that the at least one DL beam of the one or more DL beams is identified based on which of the one or more DL beams at least one of: a synchronization signal, a master system information block (MIB), or essential system information is received in the beam sweep operation.

### Claim 17

A wireless transmit/receive unit (WTRU) in communication with a communication network, the WTRU comprising:
a memory;
a transceiver, the transceiver configured at least to:
receive system information (SI) from the communication network at a first-time instance; and
a processor, the processor configured at least to:
determine a first-reference identifier (ID) that corresponds to at least some of the SI of the first-time instance;
determine a first-value identifier (ID) that corresponds to the at least some of the SI of the first-time instance;
associate at least one of: the first-reference ID, or the first-value ID with the at least some of the SI of the first-time instance;
utilize the at least some of the SI of the first-time instance in communication with the communication network;
search the memory for stored SI of a previous-time instance that is associated with the same first-reference ID of the at least some of the SI of the first-time instance;
store the at least some of the SI of the first-time instance upon no stored SI of the previous-time instance associated with the same first-reference ID being found; and
replace stored SI of the previous-time instance associated with the same first-reference ID with the at least some of the SI of the first-time instance upon a value ID associated with the stored SI of the previous-time instance associated with the same first-reference ID being different from the first-value ID.

### Claim 18 (depends on 17)

The WTRU of claim 17, wherein the processor is further configured to interpret that the value ID associated with the stored SI of the previous-time instance associated with the same first-reference ID being different from the first-value ID corresponds the at least some of the SI of the first-time instance being more current than the stored SI of the previous-time instance.

### Claim 19 (depends on 17)

The WTRU of claim 17, wherein the processor is further configured to recognize that the first-reference ID corresponds to at least one of: a first-spatial area, or a first-temporal interval.

### Claim 20 (depends on 17)

The WTRU of claim 17, wherein the processor is further configured to determine the first-reference ID by identifying the first-reference ID as communicated from the communication network via at least one of: a broadcast message, or dedicated signaling.

### Claim 21 (depends on 20)

The WTRU of claim 20, wherein the processor is further configured to determine the first-value ID by identifying a part of the first-reference ID that represents the first-value ID.

### Claim 22 (depends on 20)

The WTRU of claim 20, wherein the processor is further configured to determine the first-value ID by identifying the first-value ID as communicated from the communication network via at least one of: a broadcast message, or dedicated signaling.

### Claim 23 (depends on 17)

The WTRU of claim 17, wherein the processor is further configured to determine the first-reference ID by deriving the first-reference ID based on one or more characteristics associated with one or more downlink (DL) transmissions.

### Claim 24 (depends on 23)

The WTRU of claim 23, wherein the processor is further configured to determine the first-value ID by identifying the first-value ID as expressly communicated from the communication network via at least one of: a broadcast message, or dedicated signaling.

### Claim 25 (depends on 17)

The WTRU of claim 17, wherein the at least some of the SI of the first-time instance is at least one of: essential SI, minimum SI message, or on-demand SI.

### Claim 26 (depends on 17)

The WTRU of claim 17, wherein the processor is further configured such that to replace the stored SI of the previous-time instance associated with the same first-reference ID with the at least some of the SI of the first-time instance includes the processor being configured to:
delete from the memory the stored SI of the previous-time instance associated with the same first-reference ID; and
store in the memory the at least some of the SI of the first-time instance.

### Claim 27 (depends on 17)

The WTRU of claim 17, wherein the processor is further configured such that to replace the stored SI of the previous-time instance associated with the same first-reference ID with the at least some of the SI of the first-time instance includes the processor being configured to:
overwrite in the memory the stored SI of the previous-time instance associated with the same first-reference ID with the at least some of the SI of the first-time instance.

### Claim 28 (depends on 20)

The WTRU of claim 20, wherein the processor is further configured to:
detect that a second-reference ID is being communicated by the communication network in lieu of the first-reference ID;
search the memory for stored SI of a previous-time instance that is associated with the second-reference ID;
utilize the SI of the previous-time instance that is associated with the second-reference ID upon the SI of the previous-time instance that is associated with the second-reference ID being found; and
obtain updated SI from the communication network upon the SI of the previous-time instance that is associated with the second-reference ID not being found.

### Claim 29 (depends on 22)

The WTRU of claim 22, wherein the processor is further configured to:
detect that a second-reference ID is being communicated by the communication network in lieu of the first-reference ID;
detect that a second-value ID is being communicated by the communication network in lieu of the first-value ID;
search the memory for stored SI of a previous-time instance that is associated with the second-reference ID and the second-value ID;
utilize the SI of the previous-time instance that is associated with the second-reference ID and the second-value ID upon the SI of the previous-time instance that is associated with the second-reference ID and second-value ID being found; and
obtain updated SI from the communication network upon the SI of the previous-time instance that is associated with the second-reference ID and the second-value ID not being found.

### Claim 30

A wireless transmit/receive unit (WTRU) in communication with a communication network, the WTRU comprising:
a memory;
a processor, the processor configured at least to:
determine to request other system information (other-SI) from the communication network;
initiate the request for the other-SI from the communication network as part of a Random Access Channel (RACH) procedure; and
a transceiver, the transceiver configured at least to:
transmit a RACH signal, the RACH signal including the request for the other-SI in a random access preamble of the RACH signal, the processor being further configured to:
monitor for a message that includes a minimum SI from the communication network for a predetermined period of time following the transmission of the RACH signal;
determine if the requested other-SI is included in the message that includes the minimum SI upon a detection of the message that includes the minimum SI; and
initiate one or more retransmissions of the RACH signal upon at least one of: the message that includes the minimum SI not being detected, or the other-SI is determined to not be included in a detected message that includes the minimum SI.

### Claim 31 (depends on 30)

The WTRU of claim 30, wherein the processor is further configured such that the predetermined period of time occurs within a random access response time window.

### Claim 32 (depends on 31)

The WTRU of claim 31, wherein the processor is further configured to monitor for a predefined identifier in a control channel within the random access response time window.

### Claim 33 (depends on 32)

The WTRU of claim 32, wherein the processor is further configured such that the predefined identifier is specific to the request of the other-SI.

### Claim 34 (depends on 32)

The WTRU of claim 32, wherein the processor is further configured such that the predefined identifier is a Radio Network Temporary Identifier (RNTI).

### Claim 35 (depends on 31)

The WTRU of claim 31, wherein the processor is further configured such that the message that includes the minimum SI is at least one of: one or more random access response messages, the processor being further configured to process the at least one of the one or more random access response messages within the random access response time window.

### Claim 36 (depends on 35)

The WTRU of claim 35, wherein a format of the at least one of the one or more random access response messages is specific to the request for the other-SI.

### Claim 37 (depends on 30)

The WTRU of claim 30, wherein the processor is further configured to initiate a power ramping of the random access preamble in the one or more retransmissions.

### Claim 38 (depends on 30)

The WTRU of claim 30, wherein the processor is further configured to initiate the one or more retransmissions of the RACH signal upon at least one of: no response to the RACH signal being detected in the predetermined period of time; or a limit of a preamble counter associated with the RACH signal not being reached.

### Claim 39 (depends on 30)

The WTRU of claim 30, wherein the processor is further configured such that the message that includes the minimum SI is at least one of: a random access response message that corresponds to the random access preamble of the RACH signal, or a random access response message that does not correspond to the random access preamble of the RACH signal.

### Claim 40 (depends on 30)

The WTRU of claim 30, wherein at least one of the one or more retransmissions have been initiated by the processor, the processor being further configured to:
cease an initiation of any further retransmissions of the one or more retransmissions upon:
a detection of the message that includes the minimum SI; and
a determination that the requested other-SI is included in the detected message that includes the minimum SI.