Wireless communication system and method

• US 10,368,380 B2
• Filed: 01/15/2015
• Issued: 07/30/2019
• Est. Priority Date: 03/31/2014
• Status: Active Grant

• Current Assignee: Intellectual Discovery Co., Ltd.
• Original Assignee: Intellectual Discovery Co., Ltd.
• Inventors: Choi, Su Han
• Primary Examiner(s): Roudani, Oussama
• Application Number:
  US15/300,646
• Publication Number:
  US 20170111952A1
• Time in Patent Office: 1,657 Days
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 36/00695 using split of the control plane or user plane
• CPC Class Codes: H04W 36/185 using make before break
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

User equipment included in a wireless communication system wirelessly connects to a donor base-station to establish a macro link, wirelessly connects to a mobile relay to establish an access link, and simultaneously maintains connections with the donor base-station and the mobile relay coexisting in the same coverage area, wherein a first pre-established frequency band can be used for the access link and a second pre-established frequency band can be used for the macro link. Furthermore, the user equipment can wirelessly connect to the mobile relay to establish an access link, be assigned, from the mobile relay, a wireless resource for device-to-device communication with at least one other user equipment within the same mobile relay cell, and perform device-to-device communication with the at least one other user equipment using the assigned wireless resource.

Claims

1. A user equipment included in a wireless communication system, wherein the user equipment wirelessly accesses a mobile relay to establish an access link, wirelessly accesses a donor base-station to establish a macro link, simultaneously maintains connections with the donor base-station and the mobile relay coexisting in the same coverage area, and conducts wireless communication with the mobile relay through the access link using a pre-established first frequency band and conducts wireless communication with the donor base-station through the macro link using a pre-established second frequency band,

wherein a data transmission mode used for the access link is a time division duplex mode,

the data transmission mode used for the macro link is a frequency division duplex mode, and

the user equipment dynamically changes a resource assignment ratio for each of uplink and downlink through the access link according to predetermined conditions of change and transmits change information of the resource assignment ratio to the mobile relay, and

the change information of the resource assignment ratio is used in changing a resource assignment ratio of another user equipment within a coverage of the mobile relay as the conditions of change.

2. The user equipment of claim 1,

wherein the user equipment includes a multi-band wireless communication module that conducts wireless communication using multiple frequency bands,

conducts the wireless communication through the access link and the macro link using the multi-band wireless communication module, and

the first frequency band is higher than the second frequency band.

3. The user equipment of claim 1,

wherein the user equipment wirelessly communicates user-plane data including traffic data and data according to a protocol applied to an application layer through the access link, and

the user equipment wirelessly communicates control-plane data including control signaling data for controlling the wireless communication of the user-plane data through the macro link.

4. The user equipment of claim 1,

wherein the user equipment conducts wireless communication through the access link using a pre-established first carrier frequency band,

conducts wireless communication through the macro link using a second carrier frequency band different from the first carrier frequency band,

sets any one of the first and second carrier frequency bands as a primary carrier frequency band and the other one as a secondary carrier frequency band, and

if a capacity of traffic data is equal to or lower than a predetermined reference data capacity, the user equipment wirelessly communicates the traffic data using the primary carrier frequency band, and

if the capacity of the traffic data is higher than the reference data capacity, the user equipment wirelessly communicates the traffic data using the primary and secondary carrier frequency bands together.

5. The user equipment of claim 4,

wherein in case of using the primary and secondary carrier frequency bands together, the user equipment wirelessly communicates a part of the traffic data through the access link using the first carrier frequency band, and

wirelessly communicates the remaining traffic data through the macro link using the second carrier frequency band.

6. The user equipment of claim 4,

wherein the user equipment wirelessly communicates control signaling information for each of the primary carrier frequency band and the secondary carrier frequency band using each of the primary carrier frequency band and the secondary carrier frequency band or using the primary carrier frequency band only, and

the control signaling information includes information for controlling the primary and secondary carrier frequency bands to be used together.

7. The user equipment of claim 1,

wherein the mobile relay is assigned a wireless resource from a donor base-station wirelessly connected with the mobile relay to establish a backhaul link to the donor base-station,

wirelessly accesses at least one user equipment within a predetermined coverage to establish an access link,

conducts wireless communication with the user equipment through the access link using the first frequency band, and

conducts wireless communication through the macro link using the second frequency band.

8. The user equipment of claim 1,

wherein the donor base-station assigns a wireless resource to at least one mobile relay which is located within a predetermined coverage and wirelessly connected with the donor base-station to establish a backhaul link,

wirelessly accesses at least one user equipment within the coverage to establish a macro link, and

conducts wireless communication through the macro link and the backhaul link using the second frequency band.

9. The user equipment of claim 1,

wherein a data transmission mode used for a backhaul link established between the donor base-station and the mobile relay is the frequency division duplex mode.

10. The user equipment of claim 1,

wherein the donor base-station receives the change information of the resource assignment ratio for each of the user equipments for each of multiple mobile relays within a coverage, and

transfers the received change information of the resource assignment ratio for each mobile relay to each of at least one adjacent mobile relay.

11. A wireless communication method of a user equipment included in a wireless communication system, comprising:

establishing a macro link by wireless access to a donor base-station;

establishing an access link by wireless access to a mobile relay; and

simultaneously maintaining connections with the donor base-station and the mobile relay coexisting in the same coverage area,

wherein the access link uses a pre-established first frequency band and the macro link uses a pre-established second frequency band,

wherein the step of simultaneously maintaining of connections includes;

conducting wireless communication through the access link using a time division duplex mode;

conducting wireless communication through the macro link using a frequency division duplex mode;

dynamically changing a resource assignment ratio for each of uplink and downlink through the access link according to predetermined conditions of change; and

transmitting change information of the resource assignment ratio to the mobile relay,

wherein the change information of the resource assignment ratio is used in changing a resource assignment ratio of another user equipment within a coverage of the mobile relay as the conditions of change.

12. The wireless communication method of a user equipment of claim 11, wherein the first frequency band is higher than the second frequency band.

13. The wireless communication method of a user equipment of claim 11,

wherein the step of simultaneously maintaining of connections includes:

wirelessly communicating user-plane data through the access link; and

wirelessly communicating control-plane data through the macro link, and

the user-plane data include traffic data and data according to a protocol applied to an application layer, and

the control-plane data include control signaling data for controlling the wireless communication of the user-plane data.

14. The wireless communication method of a user equipment of claim 11,

wherein the step of simultaneously maintaining of connections includes:

conducting wireless communication through the access link using a pre-established first carrier frequency band; and

conducting wireless communication through the macro link using a second carrier frequency band different from the first carrier frequency band.

15. The wireless communication method of a user equipment of claim 11, wherein the step of simultaneously maintaining of connections includes:

conducting wireless communication through a backhaul link established between the donor base-station and the mobile relay using the frequency division duplex mode.