# US 2013/0155956 A1 · Enabling coordinated multi-point reception

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- Number: US 2013/0155956 A1
- Document ID: US20130155956A1
- Status: Published application
- Kind: A1
- Application number: 13/767,040
- Filed: 2013-02-14
- Published: 2013-06-20
- Earliest claimed: 2009-11-03
- Assignees: Texas Instruments Incorporated
- Inventors: Tarik Muharemovic; Zukang Shen; Anthony Edet Ekpenyong
- Web page: https://patentgrep.com/patent/US20130155956A1

## CPC

- H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
- H04L 43/0852: Delays
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04W 56/0065: {using measurement of signal travel time}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

This invention measures the propagation delay τ1 between the user equipment and a first cooperating unit and the propagation delay τ2 between the user equipment and a second cooperating unit. These propagation delays are used to compute a timing advance amount to the user equipment to enable coordinated multi-point reception. In a first embodiment one cooperating unit receives a function of the propagation delay, computes the timing advance amount and transmits a timing advance command to the user equipment. In a second embodiment a central unit performs these operations.

## Claims

### Claim at position 1

1-9. (canceled)

### Claim 10

A method of operating a base station, comprising:
measuring a propagation delay τ1 between a user equipment and the base station;
computing a function g(f(τ2), τ1) using a function f(τ2) of another delay τ2 and the propagation delay τ1;
computing a timing advance amount for the user equipment from the computed function g(f(τ2), τ1); and
transmitting a timing advance command having the computed timing advance amount to the user equipment.

### Claim 11 (depends on 10)

The method of claim 10, wherein another delay τ2 is a propagation delay.

### Claim 12 (depends on 11)

The method of claim 11, wherein: said function f(τ2) is a quantization of the propagation delay τ2.

### Claim 13 (depends on 11)

The method of claim 11, wherein: said function f(τ2) is a suggested timing advance amount corresponding to the propagation delay τ2.

### Claim 14 (depends on 10)

The method of claim 10, wherein said another delay τ2 is measured by another base station.

### Claim 15 (depends on 10)

The method of claim 10, wherein said another delay τ2 is the delay between the user equipment and another base station.

### Claim 15 (depends on 10)

The method of claim 10, wherein said function f(τ2) is calculated in another base station.

### Claim 16 (depends on 15)

The method of claim 15, said function f(τ2) is wirelessly transmitted to said base station.

### Claim 17 (depends on 10)

The method of claim 10, wherein the computed function g(f(τ2), τ1) is used in coordinated multi-point reception.

### Claim 18 (depends on 10)

The method of claim 10, wherein said propagation delay τ1 is measured at the base station.

### Claim 19 (depends on 10)

The method of claim 10, wherein said function g(f(τ2), τ1) is computed at the base station.

### Claim 20 (depends on 10)

The method of claim 10, wherein the base station transmits said timing advance command having the computed timing advance amount to the user equipment.

### Claim 21

A method of operating a transceiver, comprising:
measuring a propagation delay τ1 between a first transceiver and a second transceiver;
computing a function g(f(τ2), τ1) using a function f(τ2) of another delay τ2 and the propagation delay;
computing a timing advance amount for the first transceiver from the computed function g(f(τ2), τ1); and
transmitting a timing advance command having the computed timing advance amount to the first transceiver.

### Claim 22 (depends on 21)

The method of claim 21, wherein another delay τ2 is a propagation delay.

### Claim 23 (depends on 22)

The method of claim 22, wherein: said function f(τ2) is a quantization of the propagation delay τ2.

### Claim 24 (depends on 22)

The method of claim 22, wherein: said function f(τ2) is a suggested timing advance amount corresponding to the propagation delay τ2.

### Claim 25 (depends on 21)

The method of claim 21, wherein said another delay τ2 is measured by a third transceiver.

### Claim 26 (depends on 21)

The method of claim 21, wherein said another delay τ2 is the delay between the first transceiver a the third transceiver.

### Claim 27 (depends on 21)

The method of claim 21, wherein said function f(τ2) is calculated in a third transceiver.

### Claim 28 (depends on 27)

The method of claim 27, said function f(τ2) is wirelessly transmitted to said second transceiver.

### Claim 29 (depends on 21)

The method of claim 21, wherein the computed function g(f(τ2), τ1) is used in coordinated multi-point reception.

### Claim 30 (depends on 21)

The method of claim 21, wherein said propagation delay τ1 is measured at the second transceiver.

### Claim 31 (depends on 21)

The method of claim 21, wherein said function g(f(τ2), τ1) is computed at the second transceiver.

### Claim 32 (depends on 21)

The method of claim 21, wherein the second transceiver transmits said timing advance command having the computed timing advance amount to the first transceiver.

### Claim 33

A method of operating a transceiver, comprising:
receiving a timing advance command having a computed timing advance amount, the computed timing advance amount computed from a function g(f(τ2), τ1) computed using a function f(τ2) of a delay τ2 and a delay τ1; and
operating the transceiver according to the timing advance command.