Systems, methods and devices for resource allocation adjustments for wireless transmissions
Increasing a number of orthogonal time-domain transmission opportunities in a Proximity Services (ProSe) traffic generation period can reduce over-air congestion and collision in long term evolution (LTE) communications. Resource configurations can be adjusted, including providing a new physical layer numerology, reducing transmission time (TTI) interval duration, providing a smaller sidelink control information period, configuring logical sidelink control periods and/or multiplexing of control and data transmissions.
1. A system for sidelink resource configuration comprising:
an enhanced node B (eNB) wireless interface, the interface configured with a first resource allocation mode having a first transmission time interval (TTI) and a resource block configuration;
a sidelink wireless interface, the interface configured with a second resource allocation mode, wherein a second TTI of the second resource allocation mode is less than a TTI of the first resource allocation mode, wherein the second resource allocation mode uses the second TTI to reduce buffering to achieve a 100 milliseconds latency, and wherein fewer symbols of a resource block are used in the TTI of the second resource allocation mode than the first resource allocation mode;
a processor coupled to the eNB wireless interface and sidelink wireless interface, the processor configured to:
switch to the second resource allocation mode from the first resource allocation mode; and
transmit a message to a sidelink capable device using the second resource allocation mode and the second TTI.
2. The system of claim 1 , wherein a sidelink control information (SCI) period of the second resource allocation mode is less than 40 milliseconds, allowing a reduced latency compared with the first resource allocation mode having a control information period of 40 milliseconds or greater.
3. The system of claim 2 , wherein the SCI period is 5 milliseconds, 10 milliseconds, or 20 milliseconds.
4. The system of claim 1 , wherein a subcarrier spacing of the second resource allocation mode is larger than the first resource allocation mode.
5. The system of claim 4 , wherein a symbol duration of the second resource allocation mode is shorter than the first resource allocation mode.
6. The system of claim 1 , wherein the second resource allocation mode is an autonomous resource allocation mode.
7. The system of claim 1 , wherein the second resource allocation mode is an eNB-controlled resource allocation mode.
8. The system of claim 1 , wherein the first TTI is a per subframe interval and the second TTI is a per-slot interval.