Control information transmitting method, transmitter, and transmitting and receiving apparatus

• US 6,587,510 B1
• Filed: 12/03/1998
• Issued: 07/01/2003
• Est. Priority Date: 12/10/1997
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Minami, Hideki, Sakoda, Kazuyuki, Suzuki, Mitsuhiro, Yamaura, Tomoya
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Kim, Kevin
• Application Number:
  US09/204,295
• Time in Patent Office: 1,671 Days
• Field of Search: 370/318, 370/252, 370/320, 370/284, 370/285, 370/296, 370/299, 375/347, 375/227, 375/130
• US Class Current: 375/285
• CPC Class Codes: H04W 52/56 Detection of errors of TPC bits
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

A control information transmitting method for controlling transmission power, wherein a control symbol obtained by assigning control information for controlling transmission power to symbols of phase modulation is transmitted to a communication partner so as to control the transmission power of the communication partner, the control information which represents raising the transmission power of communication partner and the control information which represents lowering the transmission power of the communication partner are assigned to a pair of symbols having the longest Euclidian distance among the symbols of phase modulation. Whereby, even if receiving noise or interference are present during transmission, the control information can be prevented from being misjudged because the distance on the signal constellation is farthest apart from each other, so that the control information can be transmitted exactly.

Claims

1. A control information transmitting method for transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control the transmission power of said communication partner, said control information transmitting method comprising the steps of:

assigning said control information which indicates raising said transmission power of said communication partner and said control information which indicates lowering said transmission power of said communication partner to a pair of symbols having the longest Euclidian distance between the symbols from among said symbols of phase modulation;

selecting said phase modulation to be multiple value amplitude phase modulation, in which symbols having the maximum and minimum amplitudes are excluded from all symbols;

selecting four symbols, the respective phases of which are π

/2 away from each other, from among the remaining symbols;

assigning control information which indicates raising said transmission power and control information which indicates lowering said transmission power, respectively, to a pair of symbols the respective phases of which are π

away from each other, from among the four symbols; and

assigning control information which indicates holding said transmission power of said communication partner respectively to the remaining two symbols.

2. The control information transmitting method according to claim 1, further comprising the steps of:

selecting phase modulation to be Quadrature phase shift keying; and

assigning said control information which indicates holding said transmission power of said communication partner to remaining two symbols of said Quadrature phase shift keying chase modulation.

3. The control information transmitting method according to claim 1, further comprising the steps of:

selecting said phase modulation to be 8-phase shift keying,

selecting therefrom four symbols the respective phases of which are π

/2 away from each other from among eight symbols,

assigning said control information which indicates raising said transmission power and control information which indicates lowering said transmission power are respectively assigned to a pair of symbols the phase of which are π

away from each other from among the remaining four symbols, and

assigning control information which indicates holding said transmission power of said communication partner to the remaining two symbols.

4. The control information transmitting method according to claim 1, further comprising the steps of:

selecting said phase modulation to be multiple value amplitude phase modulation, in which four symbols having a maximum amplitude are selected from among all symbols thereof, and

assigning said control information which indicates raising said transmission power and control information which indicates lowering said transmission power respectively to a pair of symbols the phase of which are π

away from each other from among the four symbols, and

assigning control information which indicates holding said transmission power of said communication partner to the remaining two symbols.

5. A control information transmitting method of transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control a transmission power of said communication partner, comprising the steps of:

selecting as said control information for controlling transmission power, one of control information which indicates raising said transmission power of said communication partner, control information which indicates lowering said transmission power of said communication partner, and control information which includes contents of one control information previously sent to said communication partner and which indicates holding said transmission power of said communication partner, and

transmitting to said communication partner said control symbols assigned to said control information selected in said step of selecting.

6. The control information transmitting method according to claim 5, further comprising the steps of:

selecting said phase modulation to be Quadrature phase shift keying, assigning said control information which indicates raising said transmission power and said control information which indicates lowering said transmission power respectively to a pair of symbols the respective phases of which are π

away from each other from among the four symbols, and

assigning control information which indicates holding said transmission power of said communication partner and which includes previous control information indicating lowering or holding said transmission power and control information which indicates holding said transmission power of said communication partner and which includes the previous control information indicating raising or holding said transmission power respectively to the remaining two symbols.

7. The control information transmitting method according to claim 5, further comprising the steps of:

determining at a receiving side that has received said control information whether said control information previously received is inconsistent with said control information currently received, and

performing error correction based on a carrier to interference power ratio at a time when the control information is received.

8. A control information transmitting method for transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control the transmission power of said communication partner, said control information transmitting method comprising the steps of:

using “

n”

band slots having a plurality of rectangular subcarriers for communication with said communication partner, providing “

k”

subcarriers for transmitting control symbols respectively in the band slots (wherein, n≧

k} from among the “

n”

band slots, and assigning said control symbols one by one to said subcarriers for transmitting the control symbols.

9. The control information transmitting method according to claim 8, further comprising the steps of:

respectively assigning said control symbols indicating the same control information to said subcarriers for transmitting the control symbols, and at a receiving side where said control symbols are received, composing the control symbols in accordance with a carrier to interference power ratio of each band slot to decode said control information from said composed control symbols.

10. The control information transmitting method according to claim 8, further comprising the steps of:

respectively assigning said control symbols indicating the same control information to said subcarriers for transmitting the control symbols, and at receiving side where said control symbols are received, picking up said control symbols from the band slot having a predetermined carrier to interference power ratio to decode said control information.

11. The control information transmitting method according to claim 8, wherein

said control information is multiple value data, and a plurality of said subcarriers for transmitting control symbols are used to transmit the control information comprising said multiple value data.

12. The control information transmitting method according to claim 8, wherein

said control information is multiple value data having error detection and/or correction bits, and a plurality of said subcarriers for transmitting control symbols are used to transmit the control information comprising said multiple value data.

13. A transmitter for transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control the transmission power of said communication partner, said transmitter comprising:

symbol producing means for producing said control symbols by assigning said control information which indicates raising said transmission power of said communication partner and said control information which indicates lowering said transmission power of said communication partner to a pair of symbols having a longest Euclidian distance between the symbols from among said symbols of phase modulation; and

transmitting means for transmitting said control symbols to said communication partner;

wherein

said symbol producing means include means for setting said phase modulation to multiple value amplitude phase modulation, and excluding symbols having maximum and minimum amplitudes from all symbols, for selecting four symbols, the phase of which are π

/2 away from each other from among the remaining symbols, and for assigning control information which indicates raising said transmission power and control information which indicates lowering said transmission power respectively to a pair of symbol, the phase of which are π

away from each other, from among the four symbols, and then for assigning control information which indicates holding said transmission power of said communication partner, respectively, to the remaining two symbols.

14. The transmitter according to claim 13, wherein

said symbol producing means includes means for setting said phase modulation to Quadrature phase shift keying, and for assigning said control information which indicates holding said transmission power of said communication partner respectively to the remaining two symbols.

15. The transmitter according to claim 13, wherein

said symbol producing means includes means for setting said phase modulation to 8-phase shift keying, for selecting four symbols the phase of which are π

/2 away from each other among from eight symbols, and for assigning control information which indicates raising said transmission power and control information which indicates lowering said transmission power respectively to a pair of symbols the phase of which are π

away from each other from among the four symbols, and then for assigning control information which indicates holding said transmission power of said communication partner respectively to the remaining two symbols.

16. The transmitter according to claim 13, wherein

said symbol producing means includes means for setting said phase modulation to multiple value amplitude phase modulation, for selecting four symbols having a maximum amplitude among from all symbols, and for assigning control information which indicates raising said transmission power and control information which indicates lowering said transmission power respectively to a pair of symbols the phase of which are π

away from each other from among the four symbols, and then for assigning control information which indicates holding said transmission power of said communication partner respectively to the remaining two symbols.

17. A transmitter for transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control the transmission power of said communication partner, said transmitter comprising:

symbol producing means for producing said control symbols by using, as said control information, control information which indicates raising said transmission power of said communication partner, control information which indicates lowering said transmission power of said communication partner, and control information which includes contents of the control information previously sent to said communication partner and which indicates holding said transmission power of said communication partner, and for assigning one of said control information to said symbols; and

transmitting means for transmitting said control symbols to said communication partner.

18. The transmitter according to claim 17, wherein

said symbol producing means includes means for setting said phase modulation to Quadrature phase shift keying, and for assigning control information which indicates raising said transmission power and control information which indicates lowering said transmission power respectively to a pair of symbols the phase of which are π away from each other among from four symbols, and then for assigning control information which includes the previous control information indicating lowering or holding said transmission power and which indicates holding said transmission power of said communication partner and control information which includes the previous control information indicating raising or holding said transmission power and which indicates holding said transmission power of said communication partner respectively to the remaining two symbols.

19. A transmitting and receiving apparatus for receiving, from a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control transmission power of the apparatus based on the control symbols, said transmitting and receiving apparatus comprising:

transmitting means for transmitting a predetermined signal to said communication partner;

receiving means for using, as said control information, control information which indicates raising transmission power, control information which indicates lowering transmission power, and control information which includes the contents of the control information previously sent and which indicates holding transmission power, and for receiving said symbols to which one of said control information is assigned; and

control means for performing error correction on said received control information based on a carrier to interference power ratio when the control information is received, if said control information previously received is inconsistent with said control information currently received.

20. A transmitter for transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of the phase modulation, so as to control the transmission power of said communication partner, said transmitter comprising:

means for providing a plurality of rectangular subcarriers used to communicate with said communication partner, means for assigning said control symbols to the subcarriers, excluding both ends and a center of a transmission band, from among a plurality of said subcarriers, and means for transmitting subcarriers.

21. A transmitter for transmitting, to a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control the transmission power of said communication partner, said transmitter comprising:

means for using “

n”

band slots having a plurality of rectangular subcarriers for communication with said communication partner, means for respectively providing “

k”

subcarriers for transmitting control symbols in the band slots (wherein, n≧

k) from among the “

n”

band slots, and means for assigning said control symbols one by one to said subcarriers and for transmitting the control symbols.

22. The transmitter according to claim 21, wherein

said control information is multiple value data, and a plurality of said subcarriers for transmitting control symbols are used to transmit the control information comprising said multiple value data.

23. The transmitter according to claim 21, wherein

said control information is multiple value data having error detection and/or correction bits, and a plurality of said subcarriers for transmitting control symbols are used to transmit the control information comprising said multiple value data.

24. A transmitting and receiving apparatus for receiving, from a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control a transmission power of the apparatus based on the control symbols, said transmitting and receiving apparatus comprising:

means for using “

n”

band slots having a plurality of rectangular subcarriers for communication, when “

k”

subcarriers for transmitting control symbols are respectively provided in the band slots (where, n≧

k) from among the “

n”

band slots, and means for assigning the same control symbols one by one to said subcarriers for transmitting the control symbols, wherein said control symbols are composed in accordance with a carrier to interference power ratio of each band slot to decode said control information from the composed control symbols, and then the transmission power of the apparatus is controlled based on the decoded control information.

25. A transmitting and receiving apparatus for receiving, from a communication partner, control symbols obtained by assigning control information for controlling transmission power to symbols of phase modulation, so as to control a transmission power of the apparatus based on the control information, said transmitting and receiving apparatus comprising:

means for using “

n”

band slots having a plurality of rectangular subcarriers for communication, when “

k”

subcarriers for transmitting control symbols are respectively provided in the band slots (where, n≧

k) from among the “

n”

band slots, and means for assigning the same control symbols one by one to said subcarriers for transmitting the control symbols, wherein said control symbols are picked up from the band slot having a most preferable carrier to interference power ratio to decode said control information, and then the transmission power of the apparatus is controlled based on the decoded control information.