# US 10,772,077 B2 · Cell radio network temporary identifier C-RNTI allocation method and device

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- Number: US 10,772,077 B2
- Document ID: US10772077B2
- Status: Granted
- Kind: B2
- Application number: 15/636,868
- Filed: 2017-06-29
- Published: 2017-10-19
- Granted: 2020-09-08
- Earliest claimed: 2014-12-29
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Zhan Xu; Tao Yang; Baogang Xie
- Web page: https://patentgrep.com/patent/US10772077B2

## CPC

- H04W 72/04: Wireless resource allocation
- H04W 8/00: Network data management
- H04W 8/26: Network addressing or numbering for mobility support
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04L 5/001: {the frequencies being arranged in component carriers}
- 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

A cell radio network temporary identifier (C-RNTI) allocation method and device are disclosed. The method includes: when UE accesses a serving cell, randomly determining, by an entity at which the serving cell is located, a start position for selecting a C-RNTI, selecting a C-RNTI for the UE within a C-RNTI interval range starting from the start position, and allocating the selected C-RNTI to the UE. So the entity at which the serving cell is located randomizes the start position of allocation performed by the entity and uses the start position as a start position of an allocation interval, so that allocation of the C-RNTI is randomized.

## Claims

### Claim 1

A method, comprising:
randomly determining, by an entity at which a serving cell is located, a start position of a cell radio network temporary identifier (C-RNTI) interval range for selecting a C-RNTI when a user equipment (UE) accesses the serving cell, wherein the C-RNTI interval range is smaller than a C-RNTI value range;
randomly selecting, by the entity at which the serving cell is located, a C-RNTI for the UE from the C-RNTI interval range; and
allocating, by the entity at which the serving cell is located, the selected C-RNTI to the UE.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the C-RNTI value range comprises a first range and a second range, wherein the first range is used for UE supporting carrier aggregation (CA), and the second range is used for UE not supporting CA; and
wherein when the UE supports CA, the start position and the interval are both located within the first range; or when the UE does not support CA, the start position and the interval are both located within the second range.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the UE supports CA, the serving cell is a primary component carrier (PCC) of the UE, and the method further comprises:
when a secondary component carrier (SCC) of the UE is activated, sending, by the entity at which the PCC is located, the selected C-RNTI to an entity at which the SCC is located.

### Claim 4 (depends on 3)

The method according to claim 3, further comprising:
receiving, by the entity at which the PCC is located, C-RNTI reallocation request information sent by the entity at which the SCC is located, wherein the C-RNTI reallocation request information requests the entity at which the PCC is located to reallocate a C-RNTI to the UE when the entity at which the SCC is located determines that the C-RNTI allocated by the entity at which the PCC is located to the UE is allocated to another UE for use; and
selecting, by the entity at which the PCC is located, a plurality of C-RNTIs for the UE according to the C-RNTI reallocation request information and sending the selected plurality of C-RNTIs to the entity at which the SCC is located.

### Claim 5 (depends on 3)

The method according to claim 3, further comprising:
receiving, by an entity at which the SCC is located, the C-RNTI selected by the entity at which the PCC is located;
determining, by the entity at which the SCC is located, whether the C-RNTI is allocated to another UE for use; and
allocating, by the entity at which the SCC is located, the C-RNTI to the UE when it is determined that the C-RNTI is not allocated to another UE for use.

### Claim 6 (depends on 4)

The method according to claim 4, wherein selecting, by the entity at which the PCC is located, the plurality of C-RNTIs for the UE comprises:
randomly selecting, by the entity at which the PCC is located, the plurality of C-RNTIs for the UE from the interval range.

### Claim 7 (depends on 4)

The method according to claim 4, further comprising:
receiving, by the entity at which the PCC is located, a C-RNTI selected by the entity at which the SCC is located from the plurality of C-RNTIs;
sending, by the entity at which the PCC is located, a reconfiguration message to the UE, wherein the reconfiguration message carries the C-RNTI selected by the entity at which the SCC is located; and
releasing, by the entity at which the PCC is located, a C-RNTI, selected for the UE, other than the C-RNTI selected by the entity at which the SCC is located.

### Claim 8 (depends on 4)

The method according to claim 4, further comprising:
receiving, by the entity at which the SCC is located, the plurality of C-RNTIs selected by the entity at which the PCC is located for the UE;
selecting, by the entity at which the SCC is located, from the plurality of C-RNTIs, another C-RNTI that is not allocated to another UE for use; and
sending, by the entity at which the SCC is located, the selected another C-RNTI to the entity at which the PCC is located.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the interval range is preset or is determined by the entity at which the serving cell is located according to a quantity of UEs currently accessing the serving cell.

### Claim 10

A device, comprising:
a processor; and
a non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores a program, and the processor executes the program to:
randomly determine a start position of a cell radio network temporary identifier (C-RNTI) interval range for selecting a C-RNTI when a user equipment (UE) accesses a serving cell, wherein the C-RNTI interval range is smaller than a C-RNTI value range;
randomly select a C-RNTI for the UE from the C-RNTI interval range; and
allocate the selected C-RNTI to the UE.

### Claim 11 (depends on 10)

The device according to claim 10, wherein the C-RNTI value range comprises a first range and a second range, wherein the first range is used for UE supporting carrier aggregation (CA), and the second range is used for UE not supporting CA; and
when the UE supports CA, the start position and the interval range are both located within the first range; or
when the UE does not support CA, the start position and the interval range are both located within the second range.

### Claim 12 (depends on 10)

The device according to claim 10, wherein the UE supports CA, the serving cell is a primary component carrier (PCC) of the UE, and the processor further executes the program to:
send the selected C-RNTI to an entity at which a secondary component carrier (SCC) is located when the SCC of the UE is activated.

### Claim 13 (depends on 10)

The device according to claim 10, wherein the interval range is preset or is determined according to a quantity of UEs currently accessing the serving cell.

### Claim 14 (depends on 12)

The device according to claim 12, wherein the processor further executes the program to:
receive C-RNTI reallocation request information sent by the entity at which the SCC is located, wherein the C-RNTI reallocation request information requests the entity at which the PCC is located to reallocate a C-RNTI to the UE when the entity at which the SCC is located determines that the C-RNTI allocated by the entity at which the PCC is located to the UE is allocated to another UE for use;
select a plurality of C-RNTIs for the UE according to the C-RNTI reallocation request information; and
send the selected plurality of C-RNTIs to the entity at which the SCC is located.

### Claim 15 (depends on 14)

The device according to claim 14, wherein the plurality of C-RNTIs are randomly selected for the UE from the interval range.

### Claim 16 (depends on 14)

The device according to claim 14, wherein the processor further executes the program to:
receive a C-RNTI selected by the entity at which the SCC is located from the plurality of C-RNTIs;
send a reconfiguration message to the UE, wherein the reconfiguration message carries the C-RNTI selected by the entity at which the SCC is located; and
release a C-RNTI, selected for the UE, other than the C-RNTI selected by the entity at which the SCC is located.

### Claim 17

A system, comprising:
a first entity at which a primary component carrier (PCC) of a user equipment (UE) is located; and
a second entity at which a secondary component carrier (SCC) of the UE is located;
wherein the first entity is configured to:
select a cell radio network temporary identifier (C-RNTI) for the UE, wherein selecting the C-RNTI for the UE comprises:
randomly determine a start position of a cell radio network temporary identifier (C-RNTI) interval range for selecting the C-RNTI when the UE accesses the PCC, wherein the C-RNTI interval range is smaller than a C-RNTI value range; and
randomly select a C-RNTI for the UE from the C-RNTI interval range;
allocate the C-RNTI to the UE; and
send the selected C-RNTI to the entity at which the SCC is located;
wherein the second entity is configured to:
receive the C-RNTI selected by the first entity;
determine whether the C-RNTI is allocated to another UE for use; and
allocate the C-RNTI to the UE when it is determined that the C-RNTI is not allocated to another UE for use.

### Claim 18 (depends on 17)

The system according to claim 17, wherein the first entity is configured to randomly select the C-RNTI for the UE from the interval range.

### Claim 19 (depends on 17)

The system according to claim 17, wherein the C-RNTI value range comprises a first range and a second range, wherein the first range is used for UE supporting carrier aggregation (CA), and the second range is used for UE not supporting CA; and
wherein when the UE supports CA, the start position and the interval are both located within the first range, or when the UE does not support CA, the start position and the interval are both located within the second range.

### Claim 20 (depends on 17)

The system according to claim 17, wherein:
the second entity is further configured to send C-RNTI reallocation request information to the first entity when it is determined that the C-RNTI selected by the first entity is allocated to another UE for use, wherein the C-RNTI reallocation request information requests the first entity at which the PCC is located to reallocate a C-RNTI to the UE; and
the first entity is further configured to receive the C-RNTI reallocation request information, select a plurality of C-RNTIs for the UE according to the C-RNTI reallocation request information, and send the selected plurality of C-RNTIs to the second entity; and
the second entity is further configured to receive the plurality of C-RNTIs, select another C-RNTI that is not allocated to another UE for use from the plurality of C-RNTIs, and send the selected another C-RNTI to the first entity.

### Claim 21 (depends on 20)

The system according to claim 20, wherein the first entity is further configured to:
receive the another C-RNTI selected by the second entity from the plurality of C-RNTIs;
send a reconfiguration message to the UE, wherein the reconfiguration message carries the another C-RNTI selected by the second entity; and
release a C-RNTI comprised in the plurality of C-RNTIs, selected for the UE, other than the another C-RNTI selected by the second entity.

### Claim 22 (depends on 20)

The system according to claim 20, wherein the plurality of C-RNTIs are randomly selected by the first entity for the UE from the interval range.