Radio communication system with plural paths from a primary station with plural antennas to a secondary station

• US 9,178,577 B2
• Filed: 04/23/2002
• Issued: 11/03/2015
• Est. Priority Date: 04/25/2001
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Sharp Corporation (Hon Hai Precision Industry Co., Ltd.), Koninklijke Philips N.V.
• Inventors: Moulsley, Timothy J., Baker, Matthew P. J., Hunt, Bernard
• Primary Examiner(s): SEFCHECK, GREGORY B
• Application Number:
  US10/128,636
• Publication Number:
  US 20020159431A1
• Time in Patent Office: 4,942 Days
• Field of Search: 370/349, 370/389, 370/329, 370/338, 370/341, 370/470, 370/330, 370/337, 370/332, 370/321, 370/333, 370/336, 370/347, 370/311, 370/331, 370/335, 370/339, 370/340, 370/342, 370/345, 370/441, 370/442, 370/318, 370/310, 370/320, 370/204, 370/209, 370/210, 370/328, 370/431, 370/479, 375/267, 375/148, 375/262, 375/341, 375/346, 375/144, 375/348, 375/349, 343/853, 455/101, 455/103, 455/561, 455/19, 455/562.1, 455/132, 455/562, 455/277.1, 455/272, 455/273, 455/277.2, 455/522, 455/82, 455/121, 455/279.1, 455/129, 455/422, 455/424, 455/509, 455450-453, 455/455
• US Class Current: 1/1
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 45/24 Multipath
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 40/125 using a measured number of retransmissions as a link metric
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A radio communication system comprises a communication channel for the transmission of data packets (302) from a primary station having a plurality of antennas to a secondary station having at least one antenna. The channel comprises a plurality of paths, and the primary station transmits a plurality of packets substantially simultaneously. Each of the plurality of packets is transmitted via a different subset of the plurality of paths, for example by arranging for each packet to be transmitted via a different antenna or antenna beam. The secondary station receives the plurality of data packets, determines whether each packet is received correctly and signals this determination (typically as an acknowledgement (304) or a negative acknowledgement (306)) to the primary station for each of the plurality of packets. The signaling may be by any convenient means, for example transmitting each acknowledgement or negative acknowledgement via a different subset of available uplink paths.

Claims

1. A radio communication system having a communication channel comprising:

a primary station having a plurality of antennas;

a secondary station having at least one antenna; and

a plurality of paths between the primary station and the secondary station,

the primary station further comprising;

means for transmitting, substantially simultaneously, a plurality of data packets to the secondary station, the packets being transmitted via different subsets of the plurality of paths, and

the secondary station further comprising;

means for;

receiving the plurality of data packets,

determining whether the data packets were received correctly,

signaling said determination to the primary station for the plurality of packets,

signaling to the primary station a number of simultaneous data streams that the secondary station is capable of receiving or processing, and

receiving a re-transmission of incorrectly received data packets via selected ones of the subsets of the plurality of paths, said selected ones of the subsets of the plurality of paths corresponding to the subsets of the plurality of paths utilized for an initial transmission of the incorrectly received data packets, and

wherein at least one of a modulation scheme and a coding scheme for re-transmission of said data packets on said selected ones of the subsets of the plurality of paths is different from the modulation and coding scheme utilized for said selected ones of the subsets of the plurality of paths during said initial transmission of said data packets.

2. A primary station comprising:

a plurality of antennas for use in a radio communication system having a communication channel comprising a plurality of paths between the primary station and a secondary station having at least one antenna; and

means for;

transmitting substantially simultaneously a plurality of data packets to the secondary station, the data packets being transmitted via different subsets of the plurality of paths,

receiving from the secondary station a determination of whether the data packets were received incorrectly, said determination including capacity information indicating a number of simultaneous data streams that the secondary station is capable of receiving or processing; and

re-transmitting said data packets determined to be received incorrectly via selected ones of the subsets of the plurality of paths, said selected ones of the subsets of the plurality of paths being selected based at least on a quality of conditions of said subsets of the plurality of paths, and wherein at least one of a modulation scheme and a coding scheme for re-transmission of said data packets on said selected ones of the subsets of the plurality of paths is different from the modulation and coding scheme utilized for said selected ones of the subsets of the plurality of paths during an initial transmission of said data packets.

3. The primary station as claimed in claim 2, further comprising:

means for mapping each data packet to one of the plurality of antennas.

4. The primary station as claimed in claim 2, further comprising:

means for mapping each data packet to a respective antenna beam.

5. The primary station as claimed in claim 2, further comprising:

means for varying transmission parameters relating to a data packet depending on the subset of the plurality of paths over which the packet is transmitted.

6. The primary station as claimed in claim 5, wherein the varied transmission parameters are selected from modulation scheme, coding scheme and transmit power level.

7. The primary station as claimed in claim 5, further comprising:

closed loop power control means for adjusting independently a transmit power of each subset of paths.

8. A secondary station comprising:

at least one antenna for use in a radio communication system having a communication channel comprising a plurality of paths between a primary station having a plurality of antennas and the secondary station; and

means for;

receiving a plurality of data packets transmitted substantially simultaneously by the primary station, the packets being transmitted via different subsets of the plurality of paths,

determining whether each data packet is received correctly,

signaling said determination to the primary station for the plurality of data packets,

signaling to the primary station a number of simultaneous data streams that the secondary station is capable of receiving or processing; and

receiving a re-transmission of incorrectly received data packets via selected ones of the subsets of the plurality of paths, said selected ones of the subsets of the plurality of paths corresponding to the subsets of the plurality of paths utilized for an initial transmission of the incorrectly received data packets, and

wherein at least one of a modulation scheme and a coding scheme for re-transmission of said data packets on said selected ones of the subsets of the plurality of paths is different from the modulation and coding scheme utilized for said selected ones of the subsets of the plurality of paths during said initial transmission of said data packets.

9. The secondary station as claimed in claim 8, wherein a communication channel between the secondary station and the primary station comprises a subset of the plurality of paths, and said means further comprises:

means for transmitting substantially simultaneously acknowledgements corresponding to each of the simultaneously transmitted data packets, each acknowledgement being transmitted via a different subset of the plurality of paths.

10. The secondary station as claimed in claim 8, further comprising:

means for signaling channel quality feedback information to the primary station, the information relating to each of the subsets of paths used to transmit data packets.

11. The secondary station as claimed in claim 8, wherein the number of simultaneous data streams are transmitted via subsets of the plurality of paths using same air interface resources.

12. The secondary station as claimed in claim 11, wherein the system operates according to a code division multiple access protocol and wherein air interface resources comprise channelization and spreading codes.

13. A method of operating a radio communication system having a communication channel comprising a plurality of paths between a primary station having a plurality of antennas and a secondary station having at least one antenna, the method comprising:

transmitting, by the primary station, substantially simultaneously, a plurality of data packets to the secondary station, the data packets being transmitted via different subsets of the plurality of paths;

receiving, by the secondary station, the plurality of data packets;

determining, by the secondary station, whether the plurality of data packets were received correctly;

signaling said determination to the primary station;

signaling to the primary station a number of simultaneous data streams that the secondary station is capable of receiving or processing; and

receiving a re-transmission of incorrectly received data packets via selected ones of the subsets of the plurality of paths, said selected ones of the subsets of the plurality of paths corresponding to the subsets of the plurality of paths utilized for an initial transmission of the incorrectly received data packets, and

wherein at least one of a modulation scheme and a coding scheme for re-transmission of said data packets on said selected ones of the subsets of the plurality of paths is different from the modulation and coding scheme utilized for said selected ones of the subsets of the plurality of paths during said initial transmission of said data packets.

14. A primary station comprising:

a plurality of antennas for use in a radio communication system having a communication channel comprising a plurality of paths between the primary station and a secondary station having at least one antenna; and

a transceiver configured to;

transmit, substantially simultaneously, a plurality of data packets to the secondary station, the data packets being transmitted via different subsets of the plurality of paths,

receive from the secondary station an indication of said data packets received incorrectly, said indication including capacity information indicating a number of simultaneous data streams that the secondary station is capable of receiving; and

re-transmit incorrectly received data packets via selected ones of the subsets of the plurality of paths, said selected ones of the subsets of the plurality of paths corresponding to the subsets of the plurality of paths utilized for an initial transmission of the incorrectly received data packets, and

wherein at least one of a modulation scheme and a coding scheme for re-transmission of said data packets on said selected ones of the subsets of the plurality of paths is different from the modulation and coding scheme utilized for said selected ones of the subsets of the plurality of paths during said initial transmission of said data packets.

15. The primary station as claimed in claim 14, further comprising:

a processor configured to;

map each data packet to one of the plurality of antennas;

apply weights for mapping each data packet to a respective antenna beam; and

vary one of the modulation scheme, the coding scheme and a transmit power level used for transmitting the data packet, said one of said modulation scheme, said coding scheme, and said transmit power level selected based on the subset of the plurality of paths over which the data packet is transmitted.

16. The primary station as claimed in claim 14, further comprising:

a closed loop power controller, said close loop power controller adjusting, independently, a transmit power of each subset of the plurality of paths.

17. A secondary station comprising:

at least one antenna for use in a radio communication system having a communication channel comprising a plurality of paths between a primary station having a plurality of antennas and the secondary station; and

a transceiver configured to;

receive a plurality of data packets transmitted substantially simultaneously by the primary station, the packets being transmitted via different subsets of the plurality of paths,

signal a determination of which data packets are received correctly to the primary station,

signal to the primary a number of simultaneous data streams that the secondary station is capable of receiving; and

receive a re-transmission of incorrectly received data packets via selected ones of the subsets of the plurality of paths, said selected ones of the subsets of the plurality of paths corresponding to the subsets of the plurality of paths utilized for an initial transmission of the incorrectly received data packets, and

wherein at least one of a modulation scheme and a coding scheme for re-transmission of said data packets on said selected ones of the subsets of the plurality of paths is different from the modulation and coding scheme utilized for said selected ones of the subsets of the plurality of paths during said initial transmission of said data packets.

18. The secondary station as claimed in claim 17, wherein said transceiver is configured to:

transmit, substantially simultaneously, acknowledgements corresponding to each of the simultaneously received data packets, each acknowledgement being transmitted via a different subset of the plurality of paths.

19. The secondary station as claimed in claim 17, wherein said transceiver is configured to:

signal channel quality feedback information to the primary station, the information relating to each of the subsets of paths used to transmit data packets.

20. The secondary station as claimed in claim 17, wherein the simultaneous data streams are transmitted via subsets of the plurality of paths using the same air interface resources.