WLAN and LTE time division based scheduling devices and methods
A device with concurrent long-term evolution (LTE) and WLAN uplink transmission includes a WLAN transceiver coupled to an LTE transceiver via an interface. The LTE transceiver includes an LTE Layer-1 module that determines whether an LTE data downlink activity is scheduled for an LTE downlink sub-frame of an LTE time frame, based on information in a first portion of the LTE downlink sub-frame. When determination is made that the LTE data downlink activity is not scheduled for the LTE downlink sub-frame, a message may be communicated through the interface to notify the WLAN transceiver that the second portion of the LTE downlink sub-frame is available for WLAN communication. The LTE time frame includes multiple LTE downlink sub-frames each including the first portion and a second portion. The first portion provides the information that indicates whether the LTE data downlink activity is scheduled for the second portion of that LTE sub-frame.
1. A method for facilitating concurrent long-term evolution (LTE) and wireless local-area network (WLAN) uplink transmission, the method comprising:
determining whether an LTE data downlink activity is scheduled for an LTE downlink sub-frame of an LTE time frame, based on information in a first portion of the LTE downlink sub-frame, wherein the LTE time frame comprises a plurality of LTE downlink sub-frames, and each LTE downlink sub-frame includes the first portion and a second portion, and wherein the first portion provides information that indicates whether the LTE data downlink activity is scheduled for the second portion of the corresponding LTE downlink sub-frame; and
when the determination is made that the LTE data downlink activity is not scheduled for the LTE downlink sub-frame, sending an LTE-downlink occasion indication to a WLAN transceiver approximately one milli-second in advance to notify that the second portion of the LTE downlink sub-frame is available for WLAN communication.
2. The method of claim 1 , wherein the LTE transceiver and the WLAN transceiver are coexisting on a single device, wherein the single device is a mobile communication device.
3. The method of claim 1 , wherein the first portion of the LTE downlink sub-frame comprises a physical downlink control channel (PDCCH) portion, and wherein the second portion of the LTE downlink sub-frame comprises a physical downlink shared channel (PDSCH) portion.
4. The method of claim 1 , wherein the WLAN communication comprises one of WLAN uplink or WLAN downlink.
5. The method of claim 1 , further comprising sending an LTE-uplink occasion indication to the WLAN transceiver approximately two milli-second in advance, wherein sending LTE-uplink occasion indication comprises sending a wireless-coexistence interface (WCI)-2 type- 0 message.
6. The method of claim 1 , wherein sending the LTE-downlink occasion indication comprises sending a wireless-coexistence interface (WCI)-2 type- 0 message.
7. The method of claim 1 , wherein communication of the message comprises communicating a wireless-coexistence interface (WCI)-2 message, and wherein communicating the message comprises communicating a WCI-2 type- 6 message.
8. The method of claim 7 , wherein communicating WCI-2 type- 6 message causes the WLAN transceiver to override 1 WCI-2 type- 0 message received approximately one milli-second ago and to immediately start WLAN uplink transmission and use the second portion of the LTE downlink sub-frame for WLAN uplink transmission.
9. The method of claim 1 , wherein the LTE time frame comprises an LTE-frequency-division duplexing (FDD) time frame, wherein the LTE downlink sub-frame comprises an LTE-FDD sub-frame, and wherein simultaneous LTE data downlink and LTE data uplink activities are allowed in LTE-FDD standard.
10. The method of claim 1 , wherein the LTE time frame comprises a multi-frequency LTE-FDD time frame with separate LTE-FDD sub-frames allocated for simultaneous LTE data uplink and LTE data downlink activities at each frequency, and wherein determining whether the LTE data downlink is scheduled comprises determining whether simultaneous LTE-FDD data downlink is scheduled for the LTE-FDD sub-frame of all frequencies.
11. A device with concurrent long-term evolution (LTE) and wireless local-area network (WLAN) uplink transmission, the device comprising:
a WLAN transceiver; and
an LTE transceiver coupled to the WLAN transceiver via an interface, the LTE transceiver comprising an LTE Layer-1 module configured to:
determine whether an LTE data downlink activity is scheduled for an LTE downlink sub-frame of an LTE time frame, based on information in a first portion of the LTE downlink sub-frame; and
when determination is made that the LTE data downlink activity is not scheduled for the LTE downlink sub-frame, send an LTE-downlink occasion indication to the WLAN transceiver approximately one milli-second in advance to notify the WLAN transceiver that the second portion of the LTE downlink sub-frame is available for WLAN communication,
wherein the LTE time frame comprises a plurality of LTE downlink sub-frames, and each LTE downlink sub-frame includes the first portion and a second portion, and wherein the first portion provides information that indicates whether the LTE data downlink activity is scheduled for the second portion of the corresponding LTE downlink sub-frame.
12. The device of claim 11 , wherein the first portion of the LTE downlink sub-frame comprises a physical downlink control channel (PDCCH) portion, and wherein the second portion of the LTE downlink sub-frame comprises a physical downlink shared channel (PDSCH) portion.
13. The device of claim 11 , wherein the LTE Layer-1 module is configured to send an LTE-uplink occasion indication to the WLAN transceiver approximately two milli-second in advance, wherein sending LTE-uplink occasion indication comprises sending a wireless-coexistence interface (WCI)-2 type- 0 message.
14. The device of claim 11 , wherein sending the LTE-downlink occasion indication comprises sending a wireless-coexistence interface (WCI)-2 type- 0 message.
15. The device of claim 11 , wherein the LTE Layer-1 module is configured to communicate a wireless-coexistence interface (WCI)-2 message through the interface to the WLAN transceiver, and wherein communicating the WCI-2 message through the interface comprises communicating a WCI-2 type- 6 message.
16. The device of claim 15 , wherein communicating WCI-2 type- 6 message causes the WLAN transceiver to override the WCI-2 type- 0 message received approximately one milli-second ago and to immediately start WLAN uplink transmission and use the second portion of the LTE downlink sub-frame for WLAN uplink transmission.
17. The device of claim 11 , wherein the LTE time frame comprises an LTE-frequency-division duplexing (FDD) time frame, wherein the LTE downlink sub-frame comprises an LTE-FDD sub-frame, and wherein simultaneous LTE data downlink and LTE data uplink activities are allowed in LTE-FDD standard.
18. The device of claim 11 , wherein the LTE time frame comprises a multi-frequency LTE-FDD time frame with separate LTE-FDD sub-frames allocated for simultaneous LTE data uplink and LTE data downlink activities at each frequency, and wherein the LTE Layer-1 module is configured to determine whether the LTE data downlink is scheduled by determining whether simultaneous LTE-FDD data downlink is scheduled for the LTE-FDD sub-frame of all frequencies.
19. A communication system comprising:
memory;
one or more processors coupled to the memory and configured to execute one or more program modules to perform:
determining whether a long-term evolution (LTE) data downlink activity is scheduled for an LTE downlink sub-frame of an LTE time frame, based on information in a first portion of the LTE downlink sub-frame, wherein the LTE time frame comprises a plurality of LTE downlink sub-frames, and each LTE downlink sub-frame includes the first portion and a second portion, and wherein the first portion provides information that indicates whether the LTE data downlink activity is scheduled for the second portion of the corresponding LTE downlink sub-frame; and
when the determination is made that the LTE data downlink activity is not scheduled for the LTE downlink sub-frame, sending an LTE-downlink occasion indication to a WLAN transceiver approximately one milli-second in advance to notify the WLAN transceiver that the second portion of the LTE downlink sub-frame is available for WLAN communication.
20. The communication system of claim 19 , wherein the first portion of the LTE downlink sub-frame comprises a physical downlink control channel (PDCCH) portion, wherein the second portion of the LTE downlink sub-frame comprises a physical downlink shared channel (PDSCH) portion, wherein the LTE time frame comprises an LTE-frequency-division duplexing (FDD) time frame, wherein the LTE downlink sub-frame comprises an LTE-FDD sub-frame, and wherein simultaneous LTE data downlink and LTE data uplink activities are allowed in LTE-FDD standard.