# US 2010/0169751 A1 · Control channel detection for multiple implicit identifiers

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- Number: US 2010/0169751 A1
- Document ID: US20100169751A1
- Status: Published application
- Kind: A1
- Application number: 12/649,082
- Filed: 2009-12-29
- Published: 2010-07-01
- Earliest claimed: 2008-12-29
- Assignees: LG Electronics Inc.
- Inventors: Li-Hsiang Sun; Dongwook Roh
- Web page: https://patentgrep.com/patent/US20100169751A1

## CPC

- H04L 1/0072: {Error control for data other than payload data, e.g. control data}
- H04L 2001/0093: {Point-to-multipoint}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for identifying matched mobile stations includes receiving by a first mobile station signals from a plurality of mobile stations located within a threshold distance of the first mobile station, identifying a first group of mobile stations of the plurality of mobile stations, and receiving uni-cast control information from a network entity. For each mobile station of a first group, the method includes identifying a matched mobile station based upon first data of a mobile station of the first group effectively matching second data of a mobile station of a second group. One operation includes generating a descrambled information element for each matched mobile station of the first group by using the first scrambling sequence that is associated with the matched mobile station to descramble the scrambled information element of the mobile terminal of the second group that is matched to the mobile terminal of the first group.

## Claims

### Claim 1

A method for identifying matched mobile stations, the method comprising:
receiving by a first mobile station signals from a plurality of mobile stations located within a threshold distance of the first mobile station;
identifying a first group of mobile stations of the plurality of mobile stations, the first group being those mobile stations that meet a threshold requirement;
receiving uni-cast control information from a network entity, wherein the uni-cast control information comprises scheduling information for a second group of mobile stations, wherein the scheduling information for each mobile station of the second group comprises a scrambled information element and a scrambled cyclic redundancy check (CRC), wherein each mobile station of the second group is a candidate for matching to a mobile station of the first group;
for each mobile station of the first group, identifying a first scrambling sequence to be applied to an information element of an associated mobile station and a second scrambling sequence to be applied to a CRC of the associated mobile station;
for each mobile station of the first group, obtaining first data by performing a CRC on the first scrambling sequence, which is then effectively logically XOR-ed to the second scrambling sequence;
for each mobile station of the second group, obtaining second data by performing a CRC on the scrambled information element, which is then effectively logically XOR-ed to the scrambled CRC;
for each mobile station of the first group, identifying a matched mobile station based upon the first data of a mobile station of the first group effectively matching the second data of a mobile station of the second group; and
generating a descrambled information element, for each matched mobile station of the first group by using the first scrambling sequence that is associated with the matched mobile station, to descramble the scrambled information element of the mobile terminal of the second group that is matched to the mobile terminal of the first group.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the threshold distance of the first mobile station relates to a distance at which the first mobile station is able to receive the signals from the plurality of mobile stations.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the threshold requirement is at least a defined signal strength, a defined signal quality or a successful decoding of an uplink packet.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the network entity comprises a relay station or a base station.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the second group of mobile stations comprises a single mobile station.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the second group of mobile stations comprises a plurality of mobile stations.

### Claim 7

A mobile station, comprising:
a receiver configured to receive signals from a plurality of mobile stations located within a threshold distance of the mobile station and to receive uni-cast control information from a network entity; and
a controller configured to:
identify a first group of mobile stations of the plurality of mobile stations, the first group being those mobile stations that meet a threshold requirement, wherein the uni-cast control information comprises scheduling information for a second group of mobile stations, wherein the scheduling information for each mobile station of the second group comprises a scrambled information element and a scrambled cyclic redundancy check (CRC), wherein each mobile station of the second group is a candidate for matching to a mobile station of the first group;
identify for each mobile station of the first group a first scrambling sequence to be applied to an information element of an associated mobile station and a second scrambling sequence to be applied to a CRC of the associated mobile station;
obtain for each mobile station of the first group first data by performing a CRC on the first scrambling sequence, which is then effectively logically XOR-ed to the second scrambling sequence;
obtain for each mobile station of the second group second data by performing a CRC on the scrambled information element, which is then effectively logically XOR-ed to the scrambled CRC;
identify for each mobile station of the first group, a matched mobile station based upon the first data of a mobile station of the first group effectively matching the second data of a mobile station of the second group; and
generate a descrambled information element for each matched mobile station of the first group by using the first scrambling sequence that is associated with the matched mobile station to descramble the scrambled information element of the mobile terminal of the second group that is matched to the mobile terminal of the first group.

### Claim 8 (depends on 7)

The mobile station according to claim 7, wherein the threshold distance of the first mobile station relates to a distance at which the mobile station is able to receive the signals of the plurality of mobile stations.

### Claim 9 (depends on 7)

The mobile station according to claim 7, wherein the threshold requirement is at least a defined signal strength, a defined signal quality or a successful decoding of an uplink packet.

### Claim 10 (depends on 7)

The mobile station according to claim 7, wherein the network entity comprises a relay station or a base station.

### Claim 11 (depends on 7)

The mobile station according to claim 7, wherein the second group of mobile stations comprises a single mobile station.

### Claim 12 (depends on 7)

The mobile station according to claim 7, wherein the second group of mobile stations comprises a plurality of mobile stations.