WIRELESS COMMUNICATION METHOD, BASE STATION AND SYSTEM

• US 20140050487A1
• Filed: 10/25/2013
• Published: 02/20/2014
• Est. Priority Date: 04/26/2011
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: LIU, Sheng, WANG, Rui
• Granted Patent: US 9,461,739 B2
• Time in Patent Office: Days
• US Class Current: 398/127
• CPC Class Codes: H04B 10/00 Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
• CPC Class Codes: H04B 10/1125 using a single common optical path
• CPC Class Codes: H04B 10/114 Indoor or close-range type systems
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Embodiments of the present invention provide a wireless communication method, base station and system. The base station includes several LED lights and/or several VLC/IR receivers. The several LED lights are configured to send downlink signals in an OFDMA standard to a user terminal, and the several VLC/IR receivers are configured to receive uplink signals that are of an SC-FDMA standard and sent by the user terminal. The base station further includes a baseband signal processing unit configured to equate the several LED lights and/or the several VLC/IR receivers with radio remote units of an LTE mode to perform processing and resource management. The embodiments of the present invention are capable of reusing baseband signal processing and resource management manners in an existing LTE system, thereby simplifying resource management and baseband signal processing operations performed by the base station, and saving the base station resources.

Claims

1-27. -27. (canceled)

28. A base station, comprising:

a plurality of light emitting diode (LED) lights, configured to send downlink signals of an orthogonal frequency division multiple access (OFDMA) standard to a user terminal; and

a baseband signal processing unit, configured to designate the plurality of LED lights as radio remote units of a long term evolution (LTE) mode, and to perform processing and resource management on the downlink signals sent by the plurality of LED lights.

29. The base station of claim 28, wherein the plurality of LED lights are grouped into multiple LED light groups according to a space distance, and each of the LED light groups is configured to send, to the user terminal, a downlink signal that is of the OFDMA standard and has an independent frame structure.

30. The base station of claim 29, wherein each of the LED light groups comprises multiple LED light subgroups, wherein each LED light subgroup is configured to send a downlink signal that is of the OFDMA standard and of a different layer in a same frame structure to the user terminal.

31. The base station of claim 29, wherein each of the LED light groups corresponds to a visible light communication (VLC)/infrared ray (IR) (VLC/IR) receiver, and the VLC/IR receivers are configured to receive uplink signals of a single carrier frequency division multiple access (SC-FDMA) standard that have independent frame structures and are sent by the user terminal.

32. The base station according to claim 31, wherein the baseband signal processing unit is further configured to associate each of the LED light groups and corresponding VLC/IR receiver with a base station sector of the LTE mode, and perform processing and resource management on the downlink signals sent by the LED light groups and the uplink signals received by the VLC/IR receivers.

33. The base station according to claim 29, further comprising:

one radio frequency (RF) receiver corresponding to the multiple LED light groups, wherein the RF receiver is configured to receive uplink signals that are of a single carrier frequency division multiple access (SC-FDMA) standard, have a unified frame structure, and are sent by the user terminal;

wherein the baseband signal processing unit is further configured to associate each of the LED light groups with one base station sector of the LTE mode, and perform processing and resource management on the downlink signals sent by the LED light groups and the uplink signals received by the RF receiver.

34. The base station according to claim 33, wherein multiple base station sectors receive uplink signals sent by the user terminal on different time frequency resources of the uplink signals that are of the SC-FDMA standard and that have the unified frame structure, and wherein the user terminal has a unified user identifier with respect to the base multiple station sectors.

35. The base station according to claim 34, wherein user terminals in the multiple base station sectors send the same random access sequences in different positions of the uplink signals, or the user terminals in the multiple base station sectors send different random access sequences in the uplink signals.

36. The base station according to claim 29, further comprising a radiofrequency (RF) transmitter and an RF receiver, wherein:

the RF transmitter is configured to send a downlink signal of the OFDMA standard to the user terminal by using an independent RF carrier;

the RF receiver is configured to receive an uplink signal of a single carrier frequency division multiple access (SC-FDMA) standard sent on the independent RF carrier by the user terminal; and

the baseband signal processing unit is further configured to associate each of the LED light groups with an independent carrier of the LTE mode, and to perform carrier aggregation processing and resource management on downlink signals sent by the LED light groups and the RF transmitter and the uplink signal received by the RF receiver.

37. The base station according to claim 36, wherein the RF transmitter is further configured to broadcast, in a downlink channel of the RF carrier, the number of equivalent independent carriers supported by the base station and their corresponding LED light group identifiers.

38. The base station according to claim 36, wherein each of the LED light groups is further configured to broadcast, in a downlink channel of an independent carrier, a LED light group identifier corresponding to the equivalent independent carrier.

39. The base station according to claim 29, wherein each of the LED light groups is further configured to broadcast, in a downlink signal, uplink spectrum information of a corresponding base station sector.

40. The base station according to claim 28, wherein the base station is a target base station, and the baseband signal processing unit further comprises:

a receiving module, configured to receive downlink channel quality of the target base station and the user terminal, and uplink and downlink channel quality of a serving base station and the user terminal, wherein the downlink channel quality of the target base station and the user terminal, and the uplink and downlink channel quality of the serving base station and the user terminal are sent by a current serving base station of the user terminal;

an obtaining module, configured to obtain uplink channel quality of the target base station and the user terminal from a random access signal sent by the user terminal, wherein downlink signals transmitted on a downlink channel of the target base station and the user terminal are sent by the plurality of LED lights; and

a handover control module, configured to determine whether to hand over the user terminal from the serving base station to the target base station, according to uplink and downlink channel quality of the target base station and the user terminal, and the uplink and downlink channel quality of the serving base station and the user terminal.

41. The base station of claim 28, further comprising:

a plurality of visible light communication (VLC)/infrared ray (IR) (VLC/IR) receivers, configured to receive uplink signals of a single carrier frequency division multiple access (SC-FDMA) standard from the user terminal;

wherein the baseband signal processing unit is further configured to equate the several VLC/IR receivers with radio remote units of a long term evolution (LTE) mode, and to perform processing and resource management on the uplink signals received by the several VLC/IR receivers.

42. A wireless communication method, comprising:

designating, by a baseband signal processing unit of a base station, a plurality of light emitting diode (LED) lights as radio remote units (RRUs) of a long term evolution (LTE) mode and sending downlink signals of an orthogonal frequency division multiple access (OFDMA) standard to a user terminal; and

performing, by the baseband signal processing unit, processing and resource management on the downlink signals sent by the plurality of LED lights.

43. The method according to claim 42, wherein the plurality of LED lights are grouped into multiple LED light groups according to a space distance, and wherein the sending comprises:

sending, by each of the multiple LED light groups, a downlink signal to the user terminal that is of the OFDMA standard and has an independent frame structure.

44. The method according to claim 43, further comprising:

receiving, by visible light communication (VLC)/infrared ray (IR) (VLC/IR) receivers, uplink signals that are of a single carrier frequency division multiple access (SC-FDMA) standard and that have independent frame structures sent by the user terminal;

wherein each of the VLC/IR receivers corresponds to an LED light group of the multiple LED light groups.

45. The method according to claim 44, wherein each of the multiple LED light groups and its corresponding VLC/IR receiver are associated with a base station sector of the LTE mode by the baseband signal processing unit, and wherein processing and resource management are performed by the baseband signal processing unit on the downlink signals sent by the LED light groups and the uplink signals received by the VLC/IR receivers.

46. The method according to claim 43, further comprising:

receiving, by a radio frequency (RF) receiver, uplink signals that are of a single carrier frequency division multiple access (SC-FDMA) standard, that have a unified frame structure, and that are sent by the user terminal;

wherein each of the multiple LED light groups is associated with a base station sector of the LTE mode by the baseband signal processing unit, and wherein processing and resource management are performed by the baseband signal processing unit on the downlink signals sent by the multiple LED light groups and the uplink signals received by the RF receiver.

47. The method according to claim 46, wherein the receiving comprises:

receiving, by the RF receiver, uplink signals that are sent by the user terminal for different base station sectors on different time frequency resources of the uplink signals that are of the SC-FDMA standard and have unified frame structure;

wherein user terminals have a unified user identifier with respect to the different base station sectors.

48. The method according to claim 47, further comprising:

receiving, by the RF receiver, the same random access sequences that are in different positions of the uplink signals and are sent by the user terminal in different base station sectors.

49. The method according to claim 47, further comprising:

receiving, by the RF receiver, different random access sequences that are in the uplink signals and are sent by the user terminal in different base station sectors.

50. The method according to claim 42, wherein the plurality of LED lights are grouped into multiple LED light groups according to a space distance, and wherein the method further comprises:

receiving, by a radiofrequency (RF) receiver, an uplink signal that is of a single carrier frequency division multiple access (SC-FDMA) standard and sent by the user terminal on an independent RF carrier; and

wherein the sending the downlink signals comprises;

sending, by an RF transmitter and each of the multiple LED light groups,

downlink signals of the OFDMA standard to the user terminal;

wherein each of the multiple LED light groups is associated with one independent carrier of the LTE mode by the baseband signal processing unit; and

wherein carrier aggregation processing and resource management are performed by the baseband signal processing unit on downlink signals sent by the multiple LED light groups and the RF transmitter and the uplink signals received by the RF receiver.

51. The method according to claim 50, further comprising:

broadcasting, by the RF transmitter and in a downlink channel of the RF carrier, the number of separate carriers supported by the base station and corresponding LED light group identifiers.

52. The method according to claim 50, further comprising:

broadcasting, by each of the multiple LED light groups and in a downlink channel of an equivalent independent carrier, a LED light group identifier corresponding to the independent carrier.

53. The method according to claim 43, further comprising:

broadcasting, by each of the multiple LED light groups and in a downlink signal, uplink spectrum information of a corresponding independent carrier.

54. The method according to claim 43, further comprising:

receiving downlink channel quality of a target base station and the user terminal, and uplink and downlink channel quality of a serving base station and the user terminal, wherein the downlink channel quality of the target base station and the user terminal, and the uplink and downlink channel quality of the serving base station and the user terminal are sent by a current serving base station of the user terminal;

obtaining uplink channel quality of the target base station and the user terminal from a random access signal sent by the user terminal, wherein the downlink signals transmitted on the downlink channel of the target base station and the user terminal are sent by the plurality of LED lights; and

determining whether to hand over the user terminal from the serving base station to the target base station, according to uplink and downlink channel quality of the target base station and the user terminal, and the uplink and downlink channel quality of the serving base station and the user terminal.