Communication systems

• US 9,491,737 B2
• Filed: 02/28/2011
• Issued: 11/08/2016
• Est. Priority Date: 08/18/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hart, Michael John Beems, Zhou, Yuefeng
• Primary Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US13/036,640
• Publication Number:
  US 20110165834A1
• Time in Patent Office: 2,080 Days
• Field of Search: 370/254, 370/345, 370/315, 370/310, 370/252, 370/280, 370/329, 455/7, 455/423, 455/11.1, 375/145, 375/149
• US Class Current: 1/1
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04J 3/0632 Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES] queuing arrangements in packet switching elements H04L49/90; synchronising systems for the synchronous transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/56
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 84/22 with access to wired networks

Abstract

A transmission method for use in a multi-hop wireless communication system is provided. The system includes a source apparatus, a destination apparatus and one or more intermediate apparatuses. The system has access to at least one predetermined transmission introduction sequence and also having access to a time-frequency format for use in assigning available transmission frequency bandwidth during a discrete transmission interval, said format defining a plurality of transmission windows within such an interval. The method for use in this system includes, when transmitting a message with a preamble in a particular transmission interval, transmitting the preamble in a first transmission window of that transmission interval. The method further includes transmitting the transmission introduction sequence in a second transmission window of that transmission interval other than the first transmission window as control information for use by at least one said intermediate apparatus.

Claims

1. A base station comprising:

a processor; and

a transmitter;

the processor arranged to configure the transmitter to transmit a known preamble to a subscriber station or a mobile station in a down-link subframe at the same time that another known preamble is transmitted by relay station to another subscriber station or another mobile station and to transmit a relay amble to the relay station in a downlink subframe, wherein a transmission timing of the preambles and a transmission timing of the relay amble are not the same, and wherein the relay amble is transmitted at an end of the downlink subframe.

2. The base station according to claim 1, wherein the preambles are transmitted at a beginning of the downlink subframe.

3. The base station according to claim 1, wherein the preamble and the relay amble have different sequences.

4. The base station according to claim 1, wherein the relay amble is received by the relay station for synchronization or channel estimation.

5. A relay station comprising:

a transmitter configured to transmit a known preamble to a subscriber station or a mobile station in a downlink subframe at the same time that another known preamble is transmitted by a base station;

a receiving unit configured to receive a relay amble transmitted from the base station in a downlink subframe; and

a synchronizing unit configured to synchronize with the received relay amble, wherein the relay amble is transmitted at an end of the downlink subframe.

6. The relay station according to claim 5, wherein the relay amble has a certain sequence which is different from a sequence of the known preamble transmitted from the base station.

7. A method of transmission in a base station comprising:

the base station transmitting a known preamble to a subscriber station or a mobile station in a down-link subframe at the same time that another known preamble is transmitted from a relay station to another subscriber station or another mobile station; and

the base station transmitting a relay amble to the relay station in a downlink subframe, wherein a transmission timing of the preamble and a transmission timing of the relay amble are not the same, and wherein the relay amble is transmitted at an end of the downlink subframe.

8. The method according to claim 7, further comprising transmitting the preambles at a beginning of the downlink subframe.

9. The method according to claim 7, wherein the preambles and the relay amble have different sequences.

10. The method according to claim 7, wherein the relay amble is received by the relay station for synchronization or channel estimation.

11. A method in a relay station comprising:

transmitting a known preamble to a subscriber station or a mobile station in a downlink subframe at the same time that another known preamble is transmitted from a base station to another subscriber station or another mobile station;

receiving a relay amble transmitted from the base station in a downlink subframe; and

synchronizing with the received relay amble, wherein the relay amble is transmitted at an end of the downlink subframe.

12. The method according to claim 11, wherein the relay amble has a certain sequence which is different from a sequence of the known preamble transmitted from the base station.