# US 12,004,143 B2 · Resource reservation techniques for wireless communications

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- Number: US 12,004,143 B2
- Document ID: US12004143B2
- Status: Granted
- Kind: B2
- Application number: 16/739,975
- Filed: 2020-01-10
- Published: 2020-07-16
- Granted: 2024-06-04
- Earliest claimed: 2019-01-11
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Arjun Bharadwaj; Tien Viet Nguyen; Sudhir Kumar Baghel; Kapil Gulati; Shuanshuan Wu
- Web page: https://patentgrep.com/patent/US12004143B2

## CPC

- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/12: Wireless traffic scheduling
- 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}
- H04W 72/04: Wireless resource allocation
- H04W 72/20: Control channels or signalling for resource management
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods, systems, and devices for wireless communications are described in which a transmitting user equipment (UE) may determine a data packet to transmit to another UE and determine a set of candidate resources for transmission of the data packet based on a set of time-frequency resources that are allocated for UE-to-UE communications. A resource reservation signal (RRS) may be transmitted to indicate to other UEs that the set of candidate resources have been reserved by a UE. The RRS may be transmitted such that the RRS may be differentiated from other regular transmissions based at least in part on information provided by a control channel associated with the RRS or a payload of a transmission that includes the RRS. The RRS may indicate one or more of a size of an allocation of the resources and multiple locations of the resources within a time-frequency resource pool.

## Claims

### Claim 1

A method for wireless communication at a first user equipment (UE) in a sidelink communication system, comprising:
determining a time-frequency resource pool that provides wireless resources available for sidelink communications;
receiving a first transmission from a second UE in the sidelink communication system via a subset of resources of the time-frequency resource pool, the first transmission comprising a control channel;
decoding a first portion of the control channel, wherein the first portion comprises an indicator of whether a subsequent portion of the first transmission comprises a resource reservation signal (RRS) that indicates resources of the time-frequency resource pool selected for an upcoming transmission of the second UE or a data transmission and not the RRS; and
updating the time-frequency resource pool in accordance with the RRS or decoding the data transmission based at least in part on the indicator.

### Claim 2 (depends on 1)

The method of claim 1, wherein a second portion of the control channel contains information specific to data transmissions.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first portion of the control channel includes one or more of:
a bit that indicates whether the first transmission contains RRS or data;
an RRS size indication;
a size of a resource allocation of future resources of the time-frequency resource pool that are reserved;
a demodulation reference signal (DMRS) scheme of a payload of the first transmission;
a UE identification of the second UE;
a time period associated with future resources of the time-frequency resource pool that are reserved;
a priority of an upcoming data transmission to be transmitted in the future resources of the time-frequency resource pool that are reserved; or;
any combinations thereof.

### Claim 4 (depends on 2)

The method of claim 2, wherein the second portion of the control channel includes one or more of:
a rank indication (RI) of the first transmission;
a modulation and coding scheme (MCS) of the first transmission;
a transmission mode (TM) of the first transmission;
a retransmission number of a data payload of the first transmission;
a schedule for one or more retransmissions of the data payload of the first transmission; or;
any combinations thereof.

### Claim 5 (depends on 2)

The method of claim 2, wherein the first UE decodes the second portion of the control channel only when the first portion of the control channel indicates that the first transmission is a data transmission.

### Claim 6 (depends on 1)

The method of claim 1, wherein the sidelink communication system is vehicle-to-vehicle (V2V) communication system.

### Claim 7

A method for wireless communication at a first user equipment (UE) in a sidelink communication system, comprising:
determining a time-frequency resource pool that provides wireless resources available for sidelink communications;
determining that an upcoming transmission to one or more second UEs in the sidelink communication system is to be transmitted;
selecting resources of the time-frequency resource pool for transmitting the upcoming transmission to the one or more second UEs;
formatting a resource reservation signal (RRS) into a first transmission, the RRS indicating a reservation of the resources of the time-frequency resource pool for the upcoming transmission to the one or more second UEs;
formatting the RRS into a first portion of a control channel of the first transmission, wherein the first portion comprises an indicator of whether a subsequent portion of the first transmission comprises a resource reservation signal (RRS) or a data transmission and not the RRS; and
transmitting the first transmission to the one or more second UEs.

### Claim 8 (depends on 7)

The method of claim 7,
wherein a second portion of the control channel is configured to include information specific to data transmissions.

### Claim 9 (depends on 8)

The method of claim 8, wherein the first portion of the control channel includes one or more of:
a bit that indicates whether the first transmission contains RRS or data;
an RRS size indication;
a size of a resource allocation of the resources of the time-frequency resource pool that are reserved;
a demodulation reference signal (DMRS) scheme of a payload of the first transmission;
a UE identification of the first UE;
a time period associated with the resources of the time-frequency resource pool that are reserved;
a priority of a data transmission to be transmitted in the resources of the time-frequency resource pool that are reserved; or;
any combinations thereof.

### Claim 10 (depends on 8)

The method of claim 8, wherein the second portion of the control channel includes one or more of:
a rank indication (RI) of the first transmission;
a modulation and coding scheme (MCS) of the first transmission;
a transmission mode (TM) of the first transmission;
a retransmission number of a data payload of the first transmission;
a schedule for one or more retransmissions of the data payload of the first transmission; or;
any combinations thereof.

### Claim 11

An apparatus for wireless communications at a user equipment (UE) in a sidelink communication system, comprising:
a transceiver;
one or more processors; and
memory coupled to the one or more processors, the memory comprising instructions executable by the one or more processors to cause the apparatus to:
determine a time-frequency resource pool that provides wireless resources available for sidelink communications;
receive a first transmission from a second UE in the sidelink communication system via a subset of resources of the time-frequency resource pool, the first transmission comprising a control channel;
decode a first portion of the control channel, wherein the first portion comprises an indicator of whether a subsequent portion of the first transmission comprises a resource reservation signal (RRS) that indicates resources of the time-frequency resource pool selected for an upcoming transmission of the second UE or a data transmission and not the RRS; and
updating the time-frequency resource pool in accordance with the RRS or decoding the data transmission based at least in part on the indicator.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein a second portion of the control channel contains information specific to data transmissions.

### Claim 13 (depends on 12)

The apparatus of claim 12, wherein the first portion of the control channel includes one or more of:
a bit that indicates whether the first transmission contains RRS or data;
an RRS size indication;
a size of a resource allocation of future resources of the time-frequency resource pool that are reserved;
a demodulation reference signal (DMRS) scheme of a payload of the first transmission;
a UE identification of the second UE;
a time period associated with future resources of the time-frequency resource pool that are reserved;
a priority of an upcoming data transmission to be transmitted in the future resources of the time-frequency resource pool that are reserved; or;
any combinations thereof.

### Claim 14 (depends on 12)

The apparatus of claim 12, wherein the second portion of the control channel includes one or more of:
a rank indication (RI) of the first transmission;
a modulation and coding scheme (MCS) of the first transmission;
a transmission mode (TM) of the first transmission;
a retransmission number of a data payload of the first transmission;
a schedule for one or more retransmissions of the data payload of the first transmission; or;
any combinations thereof.

### Claim 15 (depends on 12)

The apparatus of claim 12, wherein the first UE decodes the second portion of the control channel only when the first portion of the control channel indicates that the first transmission is a data transmission.

### Claim 16

An apparatus for wireless communications at a user equipment (UE) in a sidelink communication system, comprising:
a transceiver;
one or more processors; and
memory coupled to the one or more processors, the memory comprising instructions executable by the one or more processors to cause the apparatus to:
determine a time-frequency resource pool that provides wireless resources available for sidelink communications;
determine that an upcoming transmission to one or more second UEs in the sidelink communication system is to be transmitted;
select resources of the time-frequency resource pool for transmitting the upcoming transmission to the one or more second UEs;
format a resource reservation signal (RRS) into a first transmission, the RRS indicating a reservation of the resources of the time-frequency resource pool for the upcoming transmission to the one or more second UEs;
format the RRS into a first portion of a control channel of the first transmission, wherein the first portion comprises an indicator of whether a subsequent portion of the first transmission comprises a resource reservation signal (RRS) or a data transmission and not both; and
transmit the first transmission to the one or more second UEs.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein a second portion of the control channel is configured to include information specific to data transmissions.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein the first portion of the control channel includes one or more of:
a bit that indicates whether the first transmission contains RRS or data;
an RRS size indication;
a size of a resource allocation of the resources of the time-frequency resource pool that are reserved;
a demodulation reference signal (DMRS) scheme of a payload of the first transmission;
a UE identification of the first UE;
a time period associated with the resources of the time-frequency resource pool that are reserved;
a priority of a data transmission to be transmitted in the resources of the time-frequency resource pool that are reserved; or;
any combinations thereof.

### Claim 19 (depends on 17)

The apparatus of claim 17, wherein the second portion of the control channel includes one or more of:
a rank indication (RI) of the first transmission;
a modulation and coding scheme (MCS) of the first transmission;
a transmission mode (TM) of the first transmission;
a retransmission number of a data payload of the first transmission;
a schedule for one or more retransmissions of the data payload of the first transmission; or;
any combinations thereof.