# US 12,010,057 B2 · Method and apparatus for allocating a pilot signal adapted to the channel characteristics

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- Number: US 12,010,057 B2
- Document ID: US12010057B2
- Status: Granted
- Kind: B2
- Application number: 17/679,778
- Filed: 2022-02-24
- Published: 2022-06-09
- Granted: 2024-06-11
- Earliest claimed: 2010-11-23
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (PUBL)
- Inventors: Johan Nyström; Pàl Frenger; Erik Dahlman; Svante Signell; Göran Klang
- Web page: https://patentgrep.com/patent/US12010057B2

## CPC

- 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 5/006: {Quality of the received signal, e.g. BER, SNR, water filling}
- H04L 25/0226: {sounding signals per se}
- H04W 16/02: Resource partitioning among network components, e.g. reuse partitioning
- H04W 16/12: Fixed resource partitioning
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 16/10: Dynamic resource partitioning
- H04W 52/325: {Power control of control or pilot channels}
- H04W 72/54: based on quality criteria
- 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

A set of different pilot structures are designed for use in different environments and/or different user behaviours that are expected to occur in a cell. The radio conditions for a user are estimated. Each user is then assigned an area (108A-E) in resource space for its communication, which has a suitable pilot configuration. In one embodiment, the entire resource space is provided with different pilot structures in different parts (110A-D) In advance and allocation of resources to the users are then performed in order to match estimated radio conditions to the provided pilot structure. In another embodiment, allocation is performed first, and then the actual pilot structure is adapted within the allocated resource space area to suit the environmental conditions.

## Claims

### Claim 1

A base station being arranged to handle connection in an Orthogonal Frequency Division Multiplexing (OFDM) system, the base station comprising:
a transmitter configured for transmitting downlink communication to a user equipment utilising a resource sub-space of an entire multi-carrier resource space of the OFDM system,
wherein the resource sub-space comprises a pilot resource configuration within a set of at least two different pilot resource configurations,
wherein the resource sub-space comprises a carrier having both pilot resources and data resources within said resource sub-space; and
wherein the transmitter is further configured for transmitting information about a power level used in a transmission of at least one pilot symbol in the pilot resources.

### Claim 2 (depends on 1)

The base station according to claim 1, wherein the transmitter is configured to transmit data characterising the at least two different pilot resource configurations to the user equipment.

### Claim 3

A method in a base station being arranged to handle connection in an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising:
transmitting downlink communication to a user equipment utilising a resource sub-space of an entire multi-carrier resource space of the OFDM system, wherein the resource sub-space comprises a pilot resource configuration within a set of at least two different pilot resource configurations, wherein the resource sub-space comprises a carrier having both pilot resources and data resources within said resource sub-space; and
transmitting information about a power level used in a transmission of at least one pilot symbol in the pilot resources.

### Claim 4 (depends on 3)

The method according to claim 3, further comprising transmitting data characterising the at least two different pilot resource configurations to the user equipment.