# US 2018/0324676 A1 · Grant-free admission control to a shared channel

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- Number: US 2018/0324676 A1
- Document ID: US20180324676A1
- Status: Published application
- Kind: A1
- Application number: 15/895,388
- Filed: 2018-02-13
- Published: 2018-11-08
- Earliest claimed: 2017-05-04
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Yi Huang; Jing Sun; Jing Jiang
- Web page: https://patentgrep.com/patent/US20180324676A1

## CPC

- H04W 48/06: based on traffic conditions
- H04W 24/02: Arrangements for optimising operational condition
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/56: based on priority criteria
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0858: {collision detection}
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods, systems, and devices for wireless communication are described for grant-free admission control to a shared channel. A base station may select an admission control parameter from a set of admission control parameters, the selected admission control parameter setting a grant-free access threshold for determining eligibility to obtain grant-free access to resources of a shared channel. The base station may transmit the selected admission control parameter to configure a user equipment (UE) with the grant-free access threshold. A UE may receive an admission control parameter from the base station, and set a grant-free access threshold based at least in part on the admission control parameter. The UE may determine eligibility to obtain grant-free access to resources of a shared channel based at least in part on the grant-free access threshold, and communicate with the base station based at least in part on the determined eligibility.

## Claims

### Claim 1

A method for wireless communication, comprising:
selecting an admission control parameter from a plurality of admission control parameters, the selected admission control parameter setting a grant-free access threshold for determining eligibility to obtain grant-free access to resources of a shared channel; and
transmitting the selected admission control parameter to configure a user equipment (UE) with the grant-free access threshold.

### Claim 2 (depends on 1)

The method of claim 1, wherein selecting the admission control parameter comprises:
detecting a collision rate within the resources of the shared channel, wherein the selected admission control parameter is based at least in part on the detected collision rate.

### Claim 3 (depends on 2)

The method of claim 2, wherein detecting the collision rate comprises:
determining a rate at which an energy level within the resources of the shared channel exceeds an energy threshold.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
detecting a collision rate within the resources of the shared channel;
adjusting the admission control parameter based at least in part on the detected collision rate; and
transmitting the adjusted admission control parameter to configure the UE with the adjusted admission control parameter.

### Claim 5 (depends on 1)

The method of claim 1, wherein:
the selected admission control parameter increases or decreases the grant-free access threshold.

### Claim 6 (depends on 1)

The method of claim 1, wherein:
the grant-free access threshold prevents the UE from accessing at least some of the resources of the shared channel.

### Claim 7 (depends on 1)

The method of claim 1, wherein:
the grant-free access threshold permits the UE to access at least some of the resources of the shared channel.

### Claim 8 (depends on 1)

The method of claim 1, wherein transmitting the selected admission control parameter further comprises:
transmitting the selected admission control parameter on a common control channel.

### Claim 9 (depends on 8)

The method of claim 8, wherein:
the common control channel is common to a group of UEs that includes the UE.

### Claim 10 (depends on 9)

The method of claim 9, wherein:
the selected admission control parameter configures each UE within the group of UEs with the grant-free access threshold.

### Claim 11 (depends on 1)

The method of claim 1, wherein transmitting the selected admission control parameter further comprises:
transmitting the selected admission control parameter in a common control channel transporting a slot format indication or in a different common control channel.

### Claim 12 (depends on 1)

The method of claim 1, wherein transmitting the selected admission control parameter further comprises:
transmitting the selected admission control parameter in a payload of a downlink shared channel.

### Claim 13 (depends on 1)

The method of claim 1, wherein transmitting the selected admission control parameter further comprises:
transmitting the selected admission control parameter using radio resource control signaling.

### Claim 14 (depends on 1)

The method of claim 1, wherein:
the selected admission control parameter comprises at least one bit.

### Claim 15 (depends on 1)

The method of claim 1, wherein:
the plurality of admission control parameters correspond to a plurality of different grant-free access thresholds.

### Claim 16 (depends on 1)

The method of claim 1, further comprising:
selecting a priority level for the UE from a plurality of priority levels; and
transmitting the selected priority level to the UE.

### Claim 17 (depends on 1)

The method of claim 1, further comprising:
determining a service level for the UE from a plurality of service levels; and
transmitting the determined service level to the UE.

### Claim 18

A method for wireless communication, comprising:
receiving an admission control parameter from a base station;
setting a grant-free access threshold based at least in part on the admission control parameter;
determining eligibility to obtain grant-free access to resources of a shared channel based at least in part on the grant-free access threshold; and
communicating with the base station based at least in part on the determined eligibility.

### Claim 19 (depends on 18)

The method of claim 18, wherein determining eligibility to obtain grant-free access to the resources of the shared channel comprises:
receiving a priority level of a plurality of priority levels from the base station; and
comparing the priority level with the grant-free access threshold.

### Claim 20 (depends on 18)

The method of claim 18, wherein determining eligibility to obtain grant-free access to the resources of the shared channel comprises:
determining a random number; and
comparing the random number with the grant-free access threshold.

### Claim 21 (depends on 20)

The method of claim 20, wherein determining the random number comprises:
determining a service level of a plurality of service levels; and
generating the random number based at least in part on the determined service level.

### Claim 22

An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
select an admission control parameter from a plurality of admission control parameters, the selected admission control parameter setting a grant-free access threshold for determining eligibility to obtain grant-free access to resources of a shared channel; and
transmit the selected admission control parameter to configure a user equipment (UE) with the grant-free access threshold.

### Claim 23 (depends on 22)

The apparatus of claim 22, wherein selecting the admission control parameter comprises instructions further executable by the processor to:
detect a collision rate within the resources of the shared channel, wherein the selected admission control parameter is based at least in part on the detected collision rate.

### Claim 24 (depends on 22)

The apparatus of claim 22, wherein the instructions are further executable by the processor to:
detect a collision rate within the resources of the shared channel;
adjust the admission control parameter based at least in part on the detected collision rate; and
transmit the adjusted admission control parameter to configure the UE with the adjusted admission control parameter.

### Claim 25 (depends on 22)

The apparatus of claim 22, wherein:
the grant-free access threshold prevents the UE from accessing at least some of the resources of the shared channel.

### Claim 26 (depends on 22)

The apparatus of claim 22, wherein:
the grant-free access threshold permits the UE to access at least some of the resources of the shared channel.

### Claim 27 (depends on 22)

The apparatus of claim 22, wherein the instructions are further executable by the processor to:
select a priority level for the UE from a plurality of priority levels; and
transmit the selected priority level to the UE.

### Claim 28 (depends on 22)

The apparatus of claim 22, wherein the instructions are further executable by the processor to:
determine a service level for the UE from a plurality of service levels; and
transmit the determined service level to the UE.

### Claim 29

An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive an admission control parameter from a base station;
set a grant-free access threshold based at least in part on the admission control parameter;
determine eligibility to obtain grant-free access to resources of a shared channel based at least in part on the grant-free access threshold; and
communicate with the base station based at least in part on the determined eligibility.

### Claim 30 (depends on 29)

The apparatus of claim 29, wherein determining eligibility to obtain grant-free access to the resources of the shared channel comprises instructions further executable by the processor to:
receive a priority level of a plurality of priority levels from the base station; and
compare the priority level with the grant-free access threshold.