Communication Systems

• US 20110165834A1
• Filed: 02/28/2011
• Published: 07/07/2011
• Est. Priority Date: 08/18/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hart, Michael John Beems, Zhou, Yuefeng
• Granted Patent: US 9,491,737 B2
• Time in Patent Office: Days
• US Class Current: 455/7
• 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 transmitting unit configured to transmit a preamble to a subscriber station or a mobile station in a down link subframe and transmit a relay amble to a 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.

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

3. The base station according to claim 1, wherein the relay amble is transmitted at an end of the downlink subframe.

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

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

6. A relay station comprising:

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

a synchronizing unit configured to synchronize with the received relay amble.

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

8. A base station comprising:

a transmitting unit configured to transmit a message to a relay station, wherein the message includes zone allocation information of a relay amble to be transmitted from the relay station to another relay station.

9. A relay station comprising:

a receiving unit configured to receive a message from a base station or a superordinate relay station, wherein the message includes zone allocation information of a relay amble to be transmitted from the relay station to a subordinate relay station.