Apparatus and methods for exchanging data in a hybrid optical wireless communication system
In an optical wireless communication, OWC, system, an apparatus ( 200 ) is configured to operate in a first mode to enable a first functionality where the apparatus acts as a bridge device between an OWC access point ( 400 ) and a first end device out of one or more end devices ( 300 a, 300 b, 300 c, 300 d ), or in a second mode to enable a second functionality where the apparatus relays data between the first end device and a second end device out of the one or more end devices ( 300 a, 300 b, 300 c, 300 d ). The apparatus ( 200 ) communicates with the OWC access point ( 400 ) by means of a first type of optical wireless link ( 450 ) using a first modulation scheme; and communicates with the first end device by means of a second type of optical wireless link ( 350 ) using a second modulation scheme. The first type of optical wireless link ( 450 ) has a wider beam angle than the second type of optical wireless link ( 350 ).
1 . An apparatus for exchanging data in an optical wireless communication, OWC, system configured to operate:
in a first mode to enable a first functionality, where the apparatus acts as a bridge device between an OWC access point and a first end device out of one or more end devices; or
in a second mode to enable a second functionality, where the apparatus relays data between the first end device and a second end device out of the one or more end devices;
the apparatus comprising:
a first optical transceiver configured to communicate with the OWC access point by means of a first type of optical wireless link using a first modulation scheme;
a second optical transceiver configured to communicate with the first end device by means of a second type of optical wireless link using a second modulation scheme;
a third optical transceiver configured to communicate with the second end device, out of the one or more end devices, by means of the second type of optical wireless link; and
a hub component configured to:
select an operation mode out of a set comprising the first mode, the second mode, and another mode where both the first functionality and the second functionality are enabled; and
connect using at least two out of the first optical transceiver, the second optical transceiver, and the third optical transceiver depending on the operation mode selected;
wherein the first optical transceiver has a wider beam angle as compared to the second optical transceiver or the third optical transceiver.
2 . The apparatus of claim 1 , wherein the first optical transceiver supports either a higher data rate or a longer communication distance as compared to the second optical transceiver.
3 . The apparatus of claim 1 , wherein the hub component is further configured to determine the operation mode according to at least one of: a user input, a predefined configuration parameter, a packet received by the first optical transceiver or the second optical transceiver, an input from the first optical transceiver or the second optical transceiver regarding a detection of the presence of the OWC access point, or a detection of the presence of one or more end devices.
4 . The apparatus of claim 1 , wherein the first modulation scheme is according to an orthogonal frequency-division multiplexing, OFDM.
5 . The apparatus of claim 1 , wherein the second modulation scheme is according to a pulse-amplitude modulation, PAM.
6 . The apparatus of claim 1 , wherein the beam angle of the first optical transceiver is at least 30 degrees.
7 . The apparatus of claim 1 , wherein the beam angle of the second optical transceiver is at most 20 degrees.
8 . The apparatus of claim 1 , wherein the second type of optical wireless link is a point-to-point link.
9 . The apparatus of claim 1 , wherein when the first functionality is enabled, the hub component is further configured to:
split data from packets received by the first optical transceiver;
provide a first portion thereof to the second optical transceiver; and
provide a second portion thereof to the third optical transceiver.
10 . The apparatus of claim 1 , wherein the second optical transceiver and the third optical transceiver have a shared common part, and wherein the shared common part is not an optical front end.
11 . The apparatus of claim 1 , wherein the second optical transceiver and the third optical transceiver are directed to different field-of-views, FOVs, with no overlap.
12 . The apparatus of claim 1 , wherein when the second functionality is enabled, the second optical transceiver and the third optical transceiver ( 230 ) are further configured to pass through a received data packet, which is destined for another end device out of the one or more end devices, to the respective optical transceiver without demodulation or decoding the payload part of the packet.
13 . An optical wireless communication, OWC, system comprising:
an apparatus according to claim 1 ; and
an OWC access point comprising a communication interface to a further network and an optical transceiver configured to communicate with the apparatus by means of a first type of optical wireless link using a first modulation scheme.
14 . A data exchanging method of an apparatus in an optical wireless communication, OWC, system, the method comprising the apparatus operating:
in a first mode to enable a first functionality by acting as a bridge device between an OWC access point and a first end device out of one or more end devices; or in a second mode to enable a second functionality by relaying data between the first end device and a second end device out of the one or more end devices;
the method further comprising the apparatus:
communicating with the OWC access point, by a first optical transceiver, by means of a first type of optical wireless link using a first modulation scheme;
communicating with the first end device, by a second optical transceiver, by means of a second type of optical wireless link using a second modulation scheme;
communicating with the second end device, by a third optical transceiver, by means of the second type of optical wireless link;
selecting an operation mode out of a set comprising the first mode, the second mode, and another mode where both the first functionality and the second functionality are enabled; and
connecting using at least two out of the first optical transceiver, the second optical transceiver, and the third optical transceiver depending on the operation mode selected;
wherein the first optical transceiver has a wider beam angle as compared to the second optical transceiver.
15 . A non-transitory computer readable medium comprising instructions which, when the instructions are executed by an apparatus comprising a processor, cause the processor of the apparatus to perform the method of claim 14 .