Method and apparatus for processing baseband uplink and downlink sub-frames
View Patent ↗The present disclosure provides a method and an apparatus for processing baseband uplink and downlink sub-frames. The method is for serial processing of uplink sub-frames and downlink sub-frames at a base station side of an LTE-TDD system, wherein a length of time slots for processing each sub-frame meets formulae { 3 x + 2 y + T L 2 ≤ 5.0 ms 2 x + y ≤ 4 - 2 T a - T d . By serial processing of the uplink and downlink sub-frames according to the present invention, more abundant processing time may be obtained. In other words, the baseband processor can operate at a lower speed, thus reducing an idle rate of the baseband processor and improving a resource utilization of the processor.
1. A method for processing baseband uplink and downlink sub-frames, comprising: at a base station of a Long Term Evolution-Time Division Duplex (LTE-TDD) system,
receiving, by a receiving antenna of the base station, uplink sub-frames 2, 3, 4, 7, 8, and 9;
transferring, by the receiving antenna, the received uplink sub-frames to a baseband processor of the base station;
processing, by the baseband processor, the uplink sub-frames transferred by the receiving antenna;
processing, by the baseband processor, downlink sub-frames 0, 1, 5, and 6;
transferring, by the baseband processor, the processed downlink sub-frames to a transmitting antenna; and
transmitting, by the transmitting antenna, the downlink sub-frames transferred by the baseband processor,
wherein the baseband processor processes the uplink sub-frames and the downlink sub-frames serially in an order of a sub-frame 2 of a current frame, a sub-frame 3 of the current frame, a sub-frame 6 of the current frame, a sub-frame 4 of the current frame, a sub-frame 0 of a next frame, a sub-frame 7 of the current frame, a sub-frame 8 of the current frame, a sub-frame 1 of the next frame, a sub-frame 9 of the current frame, and a sub-frame 5 of the next frame,
wherein information solved from the uplink sub-frame 2 of the current frame is to be sent back to a downlink channel at the downlink sub-frame 6 of the current frame, information solved from the uplink sub-frames 3 and 4 of the current frame is to be sent back to the downlink channel at the downlink sub-frame 0 of the next frame, information solved from the uplink sub-frame 7 of the current frame is to be sent back to the downlink channel at the downlink sub-frame 1 of the next frame, information solved from the uplink sub-frames 8 and 9 of the current frame is to be sent back to the downlink channel at the downlink sub-frame 5 of the next frame;
wherein a length of time slots for processing each sub-frame meets formulae
{
3
x
+
2
y
+
T
L
2
≤
5.0
ms
2
x
+
y
≤
4
-
2
T
a
-
T
d
,
wherein T a is a delay in transmission from the receiving antenna to the baseband processor as well as a delay in transmission from the baseband processor to the transmitting antenna, T d is a delay in initiating baseband sub-frame processing, T L2 is a time reserved for MAC layer processing, x represents an allowable length of time slots for processing an uplink sub-frame, and y represents an allowable length of time slots for processing a downlink sub-frame.
2. The method for processing baseband uplink and downlink sub-frames according to claim 1 ,
wherein a reserved time slot with a length of at least T L2 is inserted between the sub-frame 4 of the current frame and the sub-frame 0 of the next frame, and the reserved time slot with a length of at least T L2 is inserted between the sub-frame 9 of the current frame and the sub-frame 5 of the next frame.
3. The method for processing baseband uplink and downlink sub-frames according to claim 2 ,
the sub-frame 1 and the sub-frame 6 are special sub-frames.
4. A baseband processor at a base station of a Long Term Evolution-Time Division Duplex (LTE-TDD) system, comprising at least a serial processing module configured to:
receive uplink sub-frames 2, 3, 4, 7, 8, and 9 transferred by a receiving antenna of the base station;
processing the received uplink sub-frames;
processing downlink sub-frames 0, 1, 5, and 6;
transferring the processed downlink sub-frames to a transmitting antenna;
wherein the baseband processor processes the uplink sub-frames and the downlink sub-frames serially in an order of a sub-frame 2 of a current frame, a sub-frame 3 of the current frame, a sub-frame 6 of the current frame, a sub-frame 4 of the current frame, a sub-frame 0 of a next frame, a sub-frame 7 of the current frame, a sub-frame 8 of the current frame, a sub-frame 1 of the next frame, a sub-frame 9 of the current frame, and a sub-frame 5 of the next frame,
wherein information solved from the uplink sub-frame 2 of the current frame is to be sent back to a downlink channel at the downlink sub-frame 6 of the current frame, information solved from the uplink sub-frames 3 and 4 of the current frame is to be sent back to the downlink channel at the downlink sub-frame 0 of the next frame, information solved from the uplink sub-frame 7 of the current frame is to be sent back to the downlink channel at the downlink sub-frame 1 of the next frame, information solved from the uplink sub-frames 8 and 9 of the current frame is to be sent back to the downlink channel at the downlink sub-frame 5 of the next frame;
wherein a length of time slots for processing each sub-frame meets formulae
{
3
x
+
2
y
+
T
L
2
≤
5.0
ms
2
x
+
y
≤
4
-
2
T
a
-
T
d
,
wherein T a is a delay in transmission from the receiving antenna to the baseband processor as well as a delay in transmission from the baseband processor to the transmitting antenna, T d is a delay in initiating baseband sub-frame processing, T L2 is a time reserved for MAC layer processing, x represents an allowable length of time slots for processing an uplink sub-frame, and y represents an allowable length of time slots for processing a downlink sub-frame.
5. The apparatus for processing baseband uplink and downlink sub-frames according to claim 4 ,
wherein a reserved time slot with a length of at least T L2 is inserted between an uplink sub-frame 4 of the current frame and a downlink sub-frame 0 of the next frame, and the reserved time slot with a length of at least T L2 is inserted between an uplink sub-frame 9 of the current frame and a downlink sub-frame 5 of the next frame.