Communication systems

• US 7,970,347 B2
• Filed: 08/17/2007
• Issued: 06/28/2011
• Est. Priority Date: 08/18/2006
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Zhou, Yuefeng, Hart, Michael John Beems
• Primary Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US11/840,546
• Publication Number:
  US 20080043815A1
• Time in Patent Office: 1,411 Days
• Field of Search: 370/310.2, 370/314, 370/315, 370/320, 370/321, 370/328, 370/329, 370/330, 370/332, 370/341, 370/343, 370/338, 370/344, 370/347, 370/348, 370/203, 370/325, 455/414.1, 455/11.1, 455/450.1, 455/452.1, 455/552.1, 455/550.1
• US Class Current: 455/13.1
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A transmission method for use in a multi-hop wireless communication system is provided. Furthermore, the system has access to a time-frequency format for use in assigning available transmission frequency bandwidth during a discrete transmission interval. The format defines a plurality of transmission windows within such an interval, where each window occupies a different part of that interval and has a frequency bandwidth profile within the available transmission frequency bandwidth over its part of that interval. Furthermore, each window being assignable for such a transmission interval to one of said apparatuses for use in transmission. The transmission method for use in this system includes employing said format for one or more such transmission intervals to transmit data and control information together along at least two consecutive said links as a set of successive transmission signals, link by link. Each said signal is transmitted in an available transmission window of said interval(s) and at least two of said signals are transmitted during the same said transmission interval such that said information is transmitted along said consecutive links in fewer transmission intervals than said number of consecutive links.

Claims

1. A transmission method for use in a multi-hop wireless communication system, the system comprising a source apparatus, a destination apparatus and one or more intermediate apparatuses, the transmission method comprising:

in a first transmission window, transmitting data and/or control information for the destination apparatus from the source apparatus to a subsequent intermediate apparatus on a transmission path between the source apparatus and the destination apparatus;

receiving the data and/or control information for the destination apparatus from a previous apparatus in the first transmission window, where the previous apparatus is the source apparatus or a previous intermediate apparatus on the transmission path;

transmitting the received data and/or the received control information for the destination apparatus to a subsequent apparatus in a second transmission window, where the subsequent apparatus is the destination apparatus or a subsequent intermediate apparatus on the transmission path; and

in the second transmission window, receiving the data and/or control information for the destination apparatus from a previous intermediate apparatus on the transmission path to the destination apparatus;

wherein;

a time-frequency format is used for transmission in the system, with a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission; and

the first transmission window and the second transmission window are included within a same transmission period corresponding to a downlink subframe or an uplink subframe.

2. The transmission method according to claim 1, wherein a frequency bandwidth of said transmission windows encompass a common part of available transmission frequency bandwidth.

3. The transmission method according to claim 1, wherein a frequency bandwidth of said transmission windows extend over substantially the entire transmission frequency bandwidth for respective parts.

4. The transmission method according to claim 1, further comprising:

prior to transmission of said data and/or control information, assigning a particular transmission window of a particular transmission period to a first intermediate apparatus along said consecutive links, for transmission of data and/or control information to a second intermediate apparatus along said consecutive links, said second intermediate apparatus being a subsequent apparatus along the path from the first intermediate apparatus, and assigning a subsequent transmission window of the particular transmission period to the second intermediate apparatus for transmission of data and/or control information to a third intermediate apparatus along said consecutive links, said third intermediate apparatus being a subsequent apparatus along the path from the second intermediate apparatus.

5. The transmission method according to claim 4, wherein said system comprises at least two intermediate apparatuses, and wherein said particular transmission period is a first transmission period, the method further comprising:

prior to transmission of said data and/or control information, assigning a particular transmission window of a second transmission period subsequent to said first transmission period to said third intermediate apparatus for transmission of the data and/or control information to a fourth intermediate apparatus along said consecutive links, said fourth intermediate apparatus being a subsequent apparatus along the path from the third intermediate apparatus.

6. The transmission method according to claim 4, wherein the system comprises at least three intermediate apparatuses, the method further comprising:

prior to transmission of said data and/or control information, assigning a subsequent transmission window of the second transmission period to the fourth intermediate apparatus for transmission of the data and/or control information to a fifth intermediate apparatus along said consecutive links, said fifth intermediate apparatus being a subsequent apparatus along the path from the fourth intermediate apparatus.

7. The transmission method according to claim 4, wherein said particular and subsequent transmission windows of each of said first and/or second transmission periods are either side in time of a further transmission window of the transmission period concerned.

8. The transmission method according to claim 7, further comprising:

performing processing in said second and/or fourth intermediate apparatus during the part of the particular transmission period corresponding to the further transmission window of the transmission period concerned, so as to configure the information for transmission in the subsequent transmission window of that transmission period based upon the information received in the particular transmission window of that transmission period.

9. The transmission method according to claim 4, wherein the or each particular or subsequent transmission window comprises two component transmission windows, one of those component transmission windows being for transmission of the control information and the other one of those component transmission windows being for transmission of the data information.

10. The transmission method according to claim 1, wherein said communication path is an indirect communication path, and wherein the system comprises at least a further destination apparatus, and wherein said source apparatus or any said intermediate apparatus is operable to transmit information directly to the or each further destination apparatus along a corresponding single link forming a direct communication path.

11. The transmission method according to claim 1, comprising employing a space division multiple access technique in one or more of said transmission windows of said transmission period.

12. The transmission method according to claim 1, wherein the time-frequency format is a format for a downlink or uplink sub-frame in a time-division-duplex communication system.

13. The transmission method according to claim 1, wherein said system is an OFDM or OFDMA system, and wherein the time-frequency format is a format for an OFDM or OFDMA downlink or uplink sub-frame of an OFDM or OFDMA time-division-duplex frame.

14. The transmission method according to claim 1, wherein said transmission period is a sub-frame period.

15. The transmission method according to claim 1, wherein each said transmission window comprises a region in an OFDM or OFDMA frame structure.

16. The transmission method according to claim 1, wherein each said transmission window comprises a zone in an OFDM or OFDMA frame structure.

17. The transmission method according to claim 1, wherein said source apparatus is a base station.

18. The transmission method according to claim 1, wherein said source apparatus is a user terminal.

19. The transmission method according to claim 1, wherein said destination apparatus is a base station.

20. The transmission method according to claim 1, wherein said destination apparatus is a user terminal.

21. The transmission method according to claim 1, wherein each of said one or more intermediate apparatuses is a relay station.

22. A multi-hop wireless communication system, the system comprising:

a source apparatus, a destination apparatus and one or more intermediate apparatuses, said source apparatus being operable to transmit information along a series of links forming a communication path extending from the source apparatus to the destination apparatus via the one or more intermediate apparatuses, and the one or more intermediate apparatuses being operable to receive information from a previous apparatus along the path and to transmit the received information to a subsequent apparatus along the path;

the system using a time-frequency format for transmission in the system, with a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission, wherein the plurality of transmission windows comprise a first transmission window and a second transmission window included within the same transmission period corresponding to a downlink subframe or an uplink subframe; and

comprising

first transmission means operable to transmit data and/or control information in the first transmission window for the destination apparatus from the source apparatus to a subsequent intermediate apparatus on a transmission path between the source apparatus and the destination apparatus;

first receiving means operable to receive the data and/or control information for the destination apparatus from a previous apparatus in the first transmission window, where the previous apparatus is the source apparatus or a previous intermediate apparatus on the transmission path;

second transmission means operable to transmit the received data and/or the received control information for the destination apparatus to a subsequent apparatus in a second transmission window, where the subsequent apparatus is the destination apparatus or a subsequent intermediate apparatus on the transmission path; and

second receiving means operable to receive in the second transmission window the data and/or control information for the destination apparatus from a previous intermediate apparatus on the transmission path to the destination apparatus.

23. A suite of computer programs which, when executed on computing devices of a multi-hop wireless communication system, causes the system to carry out a transmission method, the system comprising a source apparatus, a destination apparatus and one or more intermediate apparatuses, the transmission method comprising:

in a first transmission window, transmitting data and/or control information for the destination apparatus from the source apparatus to a subsequent intermediate apparatus on a transmission path between the source apparatus and the destination apparatus;

receiving the data and/or control information for the destination apparatus from a previous apparatus in the first transmission window, where the previous apparatus is the source apparatus or a previous intermediate apparatus on the transmission path;

transmitting the received data and/or the received control information for the destination apparatus to a subsequent apparatus in a second transmission window, where the subsequent apparatus is the destination apparatus or a subsequent intermediate apparatus on the transmission path; and

in the second transmission window, receiving the data and/or control information for the destination apparatus from a previous intermediate apparatus on the transmission path to the destination apparatus;

wherein;

a time-frequency format is used for transmission in the system, with a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission; and

the first transmission window and the second transmission window are included within a same transmission period corresponding to a downlink subframe or an uplink subframe.

24. An intermediate apparatus for use in a multi-hop wireless communication system, the system further comprising a source apparatus, and a destination apparatus, the intermediate apparatus comprising:

A processor;

a reception unit to receive data and/or control information for the destination apparatus from a previous apparatus in a first transmission window, the previous apparatus is the source apparatus or a previous intermediate apparatus on a transmission path; and

a transmission unit to transmit the received data and/or the received control information for the destination apparatus to a subsequent apparatus in a second transmission window, the subsequent apparatus is the destination apparatus or a subsequent intermediate apparatus on the transmission path;

wherein a time-frequency format is used for transmission in the system, with a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission; and

the first transmission window and the second transmission window are included within a same transmission period corresponding to a downlink subframe or an uplink subframe.

25. A method for use in an intermediate apparatus of a multi-hop wireless communication system, the system further comprising a source apparatus, and a destination apparatus, said source apparatus being operable to transmit information along a series of links forming a communication path extending from the source apparatus to the destination apparatus via the intermediate apparatus, and the intermediate apparatus being operable to receive information from a previous apparatus along the path, the system using a time-frequency format for transmission in the system, a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission;

and to transmit the received information to a subsequent apparatus along the path, the method comprising;

receiving data and/or control information for the destination apparatus from a previous apparatus in a first transmission window, the previous apparatus is the source apparatus or a previous intermediate apparatus on a transmission path; and

transmitting the received data and/or the received control information for the destination apparatus to a subsequent apparatus in a second transmission window, the subsequent apparatus is the destination apparatus or a subsequent intermediate apparatus on the transmission path;

wherein a time-frequency format is used for transmission in the system, with a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission; and

the first transmission window and the second transmission window are included within a same transmission period corresponding to a downlink subframe or an uplink subframe.

26. A non-transitory computer readable medium embedded in a computer program which, when executed on a computing device of an intermediate apparatus in a multi-hop wireless communication system, causes the intermediate apparatus to carry out a transmission method, the system further comprising a source apparatus, and a destination apparatus, said source apparatus being operable to transmit information along a series of links forming a communication path extending from the source apparatus to the destination apparatus via the intermediate apparatus, and the intermediate apparatus being operable to receive information from a previous apparatus along the path and to transmit the received information to a subsequent apparatus along the path, the system using a time-frequency format for transmission in the system, a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission;

the method comprising;

receiving data and/or control information for the destination apparatus from a previous apparatus in a first transmission window, the previous apparatus is the source apparatus or a previous intermediate apparatus on a transmission path; and

transmitting the received data and/or the received control information for the destination apparatus to a subsequent apparatus in a second transmission window, the subsequent apparatus is the destination apparatus or a subsequent intermediate apparatus on the transmission path;

wherein a time-frequency format is used for transmission in the system, with a plurality of transmission windows being included within a transmission period, each window occupying a different part of the transmission period, each said window being assignable for transmission; and

the first transmission window and the second transmission window are included within a same transmission period corresponding to a downlink subframe or an uplink subframe.