# US 9,001,752 B2 · Base station, method for arranging sub burst region in base station, method for determining terminal to be communicated with, and method for allocating downlink burst region

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- Number: US 9,001,752 B2
- Document ID: US9001752B2
- Status: Granted
- Kind: B2
- Application number: 13/131,162
- Filed: 2009-11-19
- Published: 2011-12-15
- Granted: 2015-04-07
- Earliest claimed: 2008-11-26
- Assignees: KYOCERA Corporation
- Applicants: Teruhiko Miyatake; Yoshizo Sato
- Inventors: Teruhiko Miyatake; Yoshizo Sato
- Web page: https://patentgrep.com/patent/US9001752B2

## CPC

- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04W 28/26: Resource reservation
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- 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 base station including at least one circuit configured to: receive a signal from a communication terminal via an array antenna; calculate a weight to be applied to the array antenna with respect to the communication terminal, based on a known signal supplied from the communication terminal and received by the circuit; transmit a signal to the communication terminal via the array antenna; determine m (m>1) communication terminals among the plurality of communication terminals, based on a first communication quality between base stations and a plurality of communication terminals, as communication-object candidates; cause to transmit control information, which is configured to cause the communication terminal to transmit the known signal, to the m communication terminals. Thus, the circuit may determine, as communication objects, l (1≦l<m) communication terminals among the m communication terminals, based on quality of communication between the base station and the m communication terminals.

## Claims

### Claim 1

A base station that collects a plurality of communication terminals, said base station comprising:
at least one circuit that is configured to:
receive a signal from a communication terminal of the plurality of communication terminals via an array antenna;
calculate a weight to be applied to said array antenna with respect to the communication terminal, based on a known signal supplied from the communication terminal and received by the circuit;
transmit a signal to said communication terminal via said array antenna;
determine m (m>1) communication terminals among said plurality of communication terminals, based on a first communication quality between said base station and said plurality of communication terminals, as communication-object candidates;
cause to transmit control information to said m communication terminals, said control information being configured to cause the communication terminal to transmit said known signal;
determine, as communication objects, l (1≦l<m) communication terminals among said m communication terminals, based on a second communication quality between said base station and said m communication terminals, which is obtained after the m communication terminals are determined, wherein
the causing to transmit data to the l communication terminals, is based on the calculated weight, and
said first communication quality and said second communication quality are different from each other.

### Claim 2 (depends on 1)

The base station according to claim 1, wherein the at least one circuit is further configured to select: said l communication terminals from said m communication terminals based on a value obtained by dividing a CINR (Carrier-to-Interference-plus-Noise Ratio) corresponding to one frame by an average value of CINRs corresponding to a plurality of previous frames, and determines said selected communication terminals as communication objects, said one frame being received by the circuit after said m communication terminals are determined.

### Claim 3

A method for determining a communication object terminal, said method being performed in a base station that collects a plurality of communication terminals, said method comprising the steps of:
(a) receiving, by a circuit, a signal from a communication terminal of the plurality of communication terminals via an array antenna;
(b) calculating a weight to be applied to said array antenna with respect to said communication terminal, based on a known signal supplied from the communication terminal and received by said circuit;
(c) determining m (m>1) communication terminals among said plurality of communication terminals, based on a first communication quality between said base station and said plurality of communication terminals, as communication-object candidates;
(d) transmitting, by the circuit, control information to said m communication terminals via said array antenna, said control information being configured to cause the communication terminal to transmit said known signal;
(e) determining, as communication objects, l (1≦l<m) communication terminals from said m communication terminals, based on a second communication quality between said base station and said m communication terminals, after said step (c); and
(f) transmitting data to said l communication terminals via said array antenna, based on the weight calculated in said step (b), wherein the first communication quality and the second communication quality are different from each other.

### Claim 4 (depends on 3)

The method for determining a communication object terminal according to claim 3, wherein in said step (e), said l communication terminals are selected from said m communication terminals based on a value obtained by dividing a CINR (Carrier-to-Interference-plus-Noise Ratio) corresponding to one frame by an average value of CINRs corresponding to a plurality of previous frames, and said selected communication terminals are determined as communication objects, said one frame being received by said reception section after said step (c).