Semi-persistent scheduling method and apparatus

1. A method for Semi-Persistent Scheduling, SPS, transmission, comprising:

determining, by a User Equipment, UE, a Multimedia Broadcast multicast service Single Frequency Network, MBSFN, sub-frame; and

receiving, by the UE, an SPS transmission data packet in the MBSFN sub-frame, wherein receiving by the UE an SPS transmission data packet in the MBSFN sub-frame comprises:

receiving, by the UE, in the MBSFN sub-frame and decoding a data packet, borne over a Physical Downlink Shared Channel, PDSCH, transmitted over a configured downlink assignment by an evolved NodeB, eNB, and transmitting Non-Acknowledgement, NACK, information to the evolved NodeB, eNB, upon decoding in error;

discarding, by the UE, the data packet transmitted by the eNB; or judging, by the UE, whether to discard the data packet, and if so, then discarding the data packet; otherwise, reserving the data packet; and

receiving, by the UE, a retransmitted data packet for the data packet transmitted from the eNB and decoding it in combination with the data packet decoded in error to obtain PDSCH transmitted unicast service data.

2. The method according to claim 1 , wherein discarding by the UE the data packet comprises:

determining, by the UE, that MBMS service data is currently being received and that the MBMS service data needs to be transmitted in a sub-frame where the configured downlink assignment is located, and then discarding the data packet received over the configured downlink assignment;

and wherein judging by the UE whether to discard the data packet, and if so, then discarding the data packet; otherwise, reserving the data packet comprises:

detecting, by the UE, the signal strength of a UE-specific Demodulation Reference Signal, DM-RS, or a Cell-specific Reference Signal, CRS, or a Channel State Information Reference Signal, CSI-RS, and if the signal strength is above a preset threshold, then reserving the data packet; otherwise, discarding the data packet.

3. A method for Semi-Persistent Scheduling, SPS, transmission, comprising:

determining, by an evolved NodeB, eNB, a Multimedia Broadcast multicast service Single Frequency Network, MBSFN, sub-frame; and

transmitting, by the eNB, an SPS transmission data packet in the MBSFN sub-frame,

wherein transmitting by the eNB an SPS transmission data packet in the MBSFN sub-frame comprises:

transmitting, by the eNB, the SPS transmission data packet to a User Equipment, UE, in the MBSFN sub-frame, wherein the SPS transmission data packet comprises a unicast service data packet transmitted over a configured downlink assignment; and receiving, by the eNB, Non-Acknowledgement, NACK, information transmitted from the UE and transmitting a retransmitted data packet for the data packet to the UE according to the NACK information;

or

wherein transmitting by the eNB an SPS transmission data packet in the MBSFN sub-frame comprises:

detecting, by the eNB, whether a configured downlink assignment is in an MBMS transmission sub-frame and transmitting a PDCCH scheduling command to indicate that the configured downlink assignment in the current MBSFN sub-frame is invalid upon determining that the configured downlink assignment is in the MBMS transmission sub-frame; scheduling, by the eNB, dynamically a data packet intended to be transmitted over the configured downlink assignment; and transmitting, by the eNB, unicast service data over a subsequently configured downlink semi-persistent scheduling resource.

4. An apparatus for Semi-Persistent Scheduling, SPS, transmission, comprising one or more processors configured to:

determine a Multimedia Broadcast multicast service Single Frequency Network, MBSFN, sub-frame; and

receive an SPS transmission data packet in the MBSFN sub-frame, wherein the one or more processors are configured to receive in the MBSFN sub-frame and decodes a data packet, borne over a Physical Downlink Link Shared Channel, PDSCH, transmitted over a configured downlink assignment by an evolved NodeB, eNB, and to transmit Non-Acknowledgement, NACK, information to the evolved NodeB, eNB, upon decoding in error;

to discard the data packet transmitted by the eNB; or to judge whether to discard the data packet, and if so, to discard the data packet; otherwise, to reserve the data packet; and

to receive a retransmitted data packet for the data packet transmitted from the eNB and to decode it in combination with the data packet decoded in error to obtain PDSCH transmitted unicast service data.

5. The apparatus according to claim 4 , wherein:

the one or more processors determine that MBMS service data is currently being received and that the MBMS service data needs to be transmitted in a sub-frame where the configured downlink assignment is located, and then discard the data packet received over the configured downlink assignment;

or

the one or more processors detect-the signal strength of a UE-specific Demodulation Reference Signal, DM-RS, or a Cell-specific Reference Signal, CRS, or a Channel State Information Reference Signal, CSI-RS, and if the signal strength is above a preset threshold, then the one or more processors reserve the data packet; otherwise, the one or more processors discard the data packet.

6. An apparatus for Semi-Persistent Scheduling, SPS, transmission, comprising one or more processors configured to:

determine a Multimedia Broadcast multicast service Single Frequency Network, MBSFN, sub-frame; and

transmit an SPS transmission data packet in the MBSFN sub-frame,

wherein the one or more processors are configured to transmit the SPS transmission data packet to a User Equipment, UE, in the MBSFN sub-frame, wherein the SPS transmission data packet comprises a unicast service data packet transmitted over a configured downlink assignment; and

to receive Non-Acknowledgement, NACK, information transmitted from the UE and to transmit a retransmitted data packet for the data packet to the UE according to the NACK information;

or

wherein the one or more processors are configured to detect whether a configured downlink assignment is in an MBMS transmission sub-frame and transmit a PDCCH scheduling command to indicate that the configured downlink assignment in the current MBSFN sub-frame is invalid upon determining that the configured downlink assignment is in the MBMS transmission sub-frame; to schedule dynamically a data packet intended to be transmitted over the configured downlink assignment; and to transmit unicast service data over a subsequently configured downlink semi-persistent scheduling resource.