US 8,798,528 B2Granted

Multi-hop wireless communication system and relay method and relay station therein

AssigneeSiemens Aktiengesellschaft

InventorsXinglin Wang, Yi Sheng Xue

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Abstract

A relay station, which is originally deployed in the multi-hop wireless communication system and used for relaying the communication between a base station and a mobile station, is referred to as an ordinary relay station, and a relay station is referred to as an aid relay station. The aid relay station can decide whether to provide aid to the ordinary relay station, and can be invisible to the base station and the mobile station, namely, the aid relay station will not generate signaling between itself and the base station or the mobile station, and therefore the aid relay station, when being implemented, will not generate extra signaling overheads in the multi-hop wireless communication system; and at the same time, when the relay quality of an aided relay station is poor, it can be improved by the aid relay station, thereby improving the system performance of the multi-hop wireless communication system.

Claims18

Dependent claims

A relay method in a wireless communication system including a base station, a mobile station, a first relay station, and a second relay station, the method comprising:

(a) said second relay station acquiring a downlink wireless resource allocation information between said base station and said first relay station and between said first relay station and said mobile station;
said second relay station determining to aid the downlink relay of said first relay station in response to determining at least one of:
a downlink transmission rate configuration of said mobile station is currently lower than a first threshold transmission rate value specified by said downlink wireless resource allocation information between said first relay station and said mobile station;
and
a number of downlink automatic retransmission requests between said first relay station and said mobile station exceeds a first retransmission threshold value;
and
in response to determining to aid the downlink relay of said first relay station, said second relay station using said acquired downlink wireless resource allocation information to (i) receive relay data sent from said base station to said first relay station, and (ii) forward said relay data to said mobile station;
and
(b) said second relay station acquiring an uplink wireless resource allocation information between said mobile station and said first relay station and between said relay station and said base station;
said second relay station determining to aid the uplink relay of said first relay station in response to determining at least one of:
an uplink transmission rate configuration of said mobile station is currently lower than a second threshold transmission rate value specified by said uplink wireless resource allocation information between said mobile station and said first relay station;
and
a number of uplink automatic retransmission requests between said mobile station and said first relay station exceeds a second retransmission threshold value;
and
in response to determining to aid the uplink relay of said first relay station, said second relay station using said acquired uplink wireless resource allocation information to (i) receive relay data sent from said mobile station to said first relay station, and (ii) forward said relay data to said base station.

12 more elements

A relay method in a wireless communication system including a base station, a mobile station, a first relay station, and a second relay station, the method comprising:

at least one of:
(a) said second relay station acquiring a downlink wireless resource allocation information between said base station and said first relay station and between said first relay station and said mobile station;
said second relay station using said acquired downlink wireless resource allocation information to receive relay data sent by said base station to said first relay station;
said second relay station determining whether it has correctly received the relay data sent by said base station;
and
said second relay station forwarding said relay data to said mobile station only if said second relay station determines that it has correctly received the relay data sent by said base station;
and
(b) said second relay station acquiring an uplink wireless resource allocation information between said mobile station and said first relay station and between said first relay station and said base station;
said second relay station using said acquired uplink wireless resource allocation information to receive relay data sent by said mobile station to said first relay station;
said second relay station determining whether it has correctly received the relay data sent by said mobile station;
and
said second relay station forwarding said relay data to said base station only if said second relay station determines that it has correctly received the relay data sent by said mobile station.

9 more elements

A communication system, comprising:

a base station,
a mobile station;
and
a first relay station;
and
a second relay station;
wherein said base station is configured to communicate with said mobile station via said first relay station;
and
wherein said second relay station is programmed to:
(a) acquire a downlink wireless resource allocation information between said base station and said first relay station and between said first relay station and said mobile station;
determine to aid the downlink relay of said first relay station in response to determining at least one of:
a downlink transmission rate configuration of said mobile station is currently lower than a first threshold transmission rate value specified by said downlink wireless resource allocation information between said first relay station and said mobile station;
and
a number of downlink automatic retransmission requests between said first relay station and said mobile station exceeds a first retransmission threshold value;
and
in response to determining to aid the downlink relay of said first relay station, use said acquired downlink wireless resource allocation information to (i) receive relay data sent from said base station to said first relay station, and (ii) forward said relay data to said mobile station;
and
(b) acquire an uplink wireless resource allocation information between said mobile station and said first relay station and between said relay station and said base station;
determine to aid the uplink relay of said first relay station in response to determining at least one of:
an uplink transmission rate configuration of said mobile station is currently lower than a second threshold transmission rate value specified by said uplink wireless resource allocation information between said mobile station and said first relay station;
and
a number of uplink automatic retransmission requests between said mobile station and said first relay station exceeds a second retransmission threshold value;
and
in response to determining to aid the uplink relay of said first relay station, use said acquired uplink wireless resource allocation information to (i) receive relay data sent from said mobile station to said first relay station, and (ii) forward said relay data to said base station.

21 more elements

A communication system, comprising:

a base station,
a mobile station;
and
a first relay station;
and
a second relay station;
wherein said base station is configured to communicate with said mobile station via said first relay station;
and
wherein said second relay station is programmed to at least one of:
(a) acquire a downlink wireless resource allocation information between said base station and said first relay station and between said first relay station and said mobile station;
use said acquired downlink wireless resource allocation information to receive relay data sent by said base station to said first relay station;
determine whether it has correctly received the relay data sent by said base station;
and
forward said relay data to said mobile station only if said second relay station determines that it has correctly received the relay data sent by said base station;
and
(b) acquire an uplink wireless resource allocation information between said mobile station and said first relay station and between said first relay station and said base station;
use said acquired uplink wireless resource allocation information to receive relay data sent by said mobile station to said first relay station;
determine whether it has correctly received the relay data sent by said mobile station;
and
forward said relay data to said base station only if said second relay station determines that it has correctly received the relay data sent by said mobile station.

17 more elements

An aid relay station in a wireless communication system comprising a base station, a mobile station;

and an ordinary relay station,
wherein said aid relay station is programmed to:
(a) acquire a downlink wireless resource allocation information between said base station and said ordinary relay station and between said ordinary relay station and said mobile station;
determine to aid the downlink relay of said ordinary relay station in response to determining at least one of:
a downlink transmission rate configuration of said mobile station is currently lower than a first threshold transmission rate value specified by said downlink wireless resource allocation information between said ordinary relay station and said mobile station;
and
a number of downlink automatic retransmission requests between said ordinary relay station and said mobile station exceeds a first retransmission threshold value;
and
in response to determining to aid the downlink relay of said ordinary relay station, use said acquired downlink wireless resource allocation information to (i) receive relay data sent from said base station to said ordinary relay station, and (ii) forward said relay data to said mobile station;
and
(b) acquire an uplink wireless resource allocation information between said mobile station and said ordinary relay station and between said relay station and said base station;
determine to aid the uplink relay of said ordinary relay station in response to determining at least one of:
an uplink transmission rate configuration of said mobile station is currently lower than a second threshold transmission rate value specified by said uplink wireless resource allocation information between said mobile station and said ordinary relay station;
and
a number of uplink automatic retransmission requests between said mobile station and said ordinary relay station exceeds a second retransmission threshold value;
and
in response to determining to aid the uplink relay of said ordinary relay station, use said acquired uplink wireless resource allocation information to (i) receive relay data sent from said mobile station to said ordinary relay station, and (ii) forward said relay data to said base station.

14 more elements

An aid relay station in a wireless communication system comprising a base station, a mobile station;

and an ordinary relay station,
wherein said aid relay station is programmed to at least one of:
(a) acquire a downlink wireless resource allocation information between said base station and said ordinary relay station and between said ordinary relay station and said mobile station;
use said acquired downlink wireless resource allocation information to receive relay data sent by said base station to said ordinary relay station;
determine whether it has correctly received the relay data sent by said base station;
and
forward said relay data to said mobile station only if said aid relay station determines that it has correctly received the relay data sent by said base station;
and
(b) acquire an uplink wireless resource allocation information between said mobile station and said ordinary relay station and between said ordinary relay station and said base station;
use said acquired uplink wireless resource allocation information to receive relay data sent by said mobile station to said ordinary relay station;
determine whether it has correctly received the relay data sent by said mobile station;
and
forward said relay data to said base station only if said aid relay station determines that it has correctly received the relay data sent by said mobile station.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/120,016Filed 15 Sep 2009
Priority: CN 2008 1 016691426 Sep 2008
Published: US 2011/0189944 A14 Aug 2011
Granted: 5 Aug 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04W 72/04
Local resource management: wireless resource allocation
H04B 7/155
Active relay systems: ground-based stations
H04B 7/2606
Arrangements for wireless physical layer control: arrangements for base station coverage control, e.g. by using relays in tunnels
H04W 16/26
Cell structures: cell enhancers or enhancement, e.g. for tunnels, building shadow