Inserting virtual carrier in conventional OFDM host carrier in communications system

Patent metadata

Field	Value
Publication number	US-10299274-B2
Application number	US-201715656156-A
Country	US
Kind code	B2
Filing date	Jul 21, 2017
Priority date	Feb 4, 2011
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A network element for use in a mobile communications system and a method of using a network element for communicating data to/from mobile communications devices in a mobile communications system. The network element can provide a wireless access interface for communicating data to/from the mobile communications devices, the wireless access interface including: on a downlink a host carrier, the host carrier providing plural resource elements across a first frequency range; transmit data for a first group of mobile communications devices, wherein the data is distributed within the plural resource elements across the first frequency range; a virtual carrier via the wireless access interface, the virtual carrier providing one or more resource elements within a second frequency range which is within and smaller than the first frequency range; and transmit data for a second group of mobile communications devices via the virtual carrier.

First claim

The invention claimed is:

1. An electronic device comprising:
circuitry configured to
locate, within a wireless access interface provided by a base station, a virtual carrier that includes a first plurality of resource elements across a first range of system resource blocks which is within and smaller than a second range of system resource blocks that span a system frequency bandwidth;
decode a control portion within the virtual carrier, the control portion identifying resource elements within the virtual carrier that are allocated to the electronic device;
locate the allocated resource elements within the virtual carrier based on the decoded control portion; and
receive data transmitted by the base station by decoding the allocated resource elements within the virtual carrier.

2. The electronic device of claim 1 , wherein
the control portion within the virtual carrier is included in a first sub-frame transmitted by the base station, and
the allocated resource elements are included in a second sub-frame, which is transmitted by the base station subsequent to the first sub-frame.

3. The electronic device of claim 2 , wherein the second sub-frame immediately follows the first sub-frame.

4. The electronic device of claim 2 , wherein the allocated resource elements include a subset of resource elements in the virtual carrier of the second sub-frame.

5. The electronic device of claim 2 , wherein the allocated resource elements include an entirety of resource elements of the virtual carrier in the second sub-frame.

6. The electronic device of claim 1 , wherein
the allocated resource elements include network configuration information, and
the circuitry is configured to decode the allocated resource elements to identify the network configuration information.

7. The electronic device of claim 1 , wherein the circuitry is configured to synchronize with the base station based on a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) transmitted by the base station.

8. The electronic device of claim 7 , wherein the circuitry is configured to receive and decode a primary broadcast channel (PBCH) transmitted by the base station after performing the synchronization with the base station and before locating the virtual carrier.

9. The electronic device of claim 1 , wherein the first range of system resource blocks includes fewer than one hundred resource blocks.

10. An electronic device comprising:
circuitry configured to
locate, within a wireless access interface provided by a base station, a virtual downlink carrier that includes a first plurality of resource elements across a first range of system resource blocks which is within and smaller than a second range of system resource blocks that span a system frequency bandwidth;
decode a control portion within the downlink virtual carrier, the control portion identifying a physical random access channel (PRACH) to transmit a random access request to the base station; and
transmit a random access request to the base station on the PRACH based on the decoded control portion within the downlink virtual carrier.

11. The electronic device of claim 10 , wherein the first range of system resource blocks includes fewer than one hundred resource blocks.

12. The electronic device of claim 10 , wherein
the control portion identifies that the PRACH is in a virtual uplink carrier, and
the circuitry is configured to transmit the random access request to the base station on the PRACH included in the uplink virtual carrier.

13. The electronic device of claim 12 , wherein the virtual uplink carrier includes a same number of resource elements as the downlink virtual carrier.

14. The electronic device of claim 10 , wherein
the control portion identifies that the PRACH is in a host carrier bandwidth outside of a virtual uplink carrier, and
the circuitry is configured to transmit the random access request to the base station on the PRACH included in the host carrier bandwidth.

15. The electronic device of claim 10 , wherein
the control portion identifies that the PRACH is included in a subset of a plurality of uplink sub-frames, and
the circuitry is configured to transmit the random access request to the base station on the PRACH included in subset of the plurality of uplink sub-frames.

16. An electronic device comprising:
circuitry configured to
locate, within a wireless access interface provided by a base station, a virtual carrier that includes a first plurality of resource elements across a first range of system resource blocks which is within and smaller than a second range of system resource blocks that span a system frequency bandwidth;
extract reference signals included in the virtual carrier;
estimate a channel function applied to data received on the virtual carrier based on the extracted reference signals;
decode a control portion within the virtual carrier based on the estimate channel function, the control portion identifying resource elements within the virtual carrier that are allocated to the electronic device;
locate the allocated resource elements within the virtual carrier based on the decoded control portion; and
receive data transmitted by the base station by decoding the allocated resource elements within the virtual carrier.

17. The electronic device of claim 16 , wherein the first range of system resource blocks includes fewer than one hundred resource blocks.

18. The electronic device of claim 16 , wherein density of reference signals included in the virtual carrier is greater than a density of reference signals included in the system bandwidth outside of the virtual carrier.

19. The electronic device of claim 16 , wherein the reference signals are included in edges of a frequency bandwidth of the virtual carrier.

20. The electronic device of claim 16 , wherein the circuitry is configured to use the reference signals to determine at least one of metrics for received signal power indications, automatic frequency control metrics and automatic gain control metrics.

Assignees

• Sca Ipla Holdings Inc

Inventors

• Mcnamara Darren
• Lillie Andrew
• Darwood Peter
• Beale Martin

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/52

  based on load · CPC title

• H04L5/0039 Primary

  Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W16/00

  Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures · CPC title