SYSTEMS AND METHODS FOR SEMI-PERSISTENT SCHEDULING OF WIRELESS COMMUNICATIONS

• US 20140092829A1
• Filed: 06/27/2013
• Published: 04/03/2014
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Alexei Davydov, Han Seunghee, Jong-Kae Fwu, Xiaogang Chen, Yuan Zhu
• Inventors: HAN, SEUNGHEE, ZHU, YUAN, CHEN, XIAOGANG, DAVYDOV, ALEXEI, FWU, JONG-KAE
• Granted Patent: US 9,973,315 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods, systems, and devices for transmission and reception of SPS communications are disclosed herein. User equipment (UE) is configured to receive, in a first subframe, a physical downlink control channel or enhanced physical downlink control channel (PDCCH/EPDCCH) corresponding to semi-persistent scheduling (SPS) activation. The PDCCH/EPDCCH conveys a value of nSCID. The UE configures, based on the SPS activation, a downlink (DL) assignment in a second subframe for receiving an SPS physical downlink shared channel (PDSCH) without a corresponding PDCCH/EPDCCH. The UE determines a reference signal sequence corresponding to the SPS PDSCH using n_SCID derived from the PDCCH/EPDCCH corresponding to the associated SPS activation. The UE receives the SPS PDSCH in a second subframe. The UE processes the SPS PDSCH based on the reference signal sequence for the SPS PDSCH in the second subframe using the n_SCID derived from the PDCCH/EPDCCH corresponding to the associated SPS activation. The UE is configured for transmission mode 10 (TM10).

Claims

1. User equipment (UE) configured to:

receive, in a subframe, a physical downlink control channel or enhanced physical downlink control channel (PDCCH/EPDCCH) corresponding to semi-persistent scheduling (SPS) activation, wherein the PDCCH/EPDCCH conveys a value of n_SCID;

configure, based on the SPS activation, a downlink (DL) assignment in another subframe;

receive, in the other subframe, a physical downlink shared channel (PDSCH) without a corresponding PDCCH/EPDCCH;

determine a reference signal sequence corresponding to the PDSCH using the value of n_SCID derived from the PDCCH/EPDCCH corresponding to the associated SPS activation; and

process the PDSCH based on the reference signal sequence determined using the value of n_SCID derived from the PDCCH/EPDCCH corresponding to the associated SPS activation.

2. The UE of claim 1, wherein the UE is configured for transmission mode 10 (TM10) for coordinated multipoint (CoMP) transmission or reception, and wherein one or more of the PDSCH and the PDCCH/EPDCCH corresponding to the associated SPS activation comprise CoMP transmissions.

3. The UE of claim 1, wherein the UE is further configured to monitor a downlink control information (DCI) format and wherein the value of n_SCID is conveyed according to DCI format 2D.

4. The UE of claim 1, wherein to determine the reference signal sequence, the UE is configured to generate the reference signal sequence based on a virtual cell identity of n_ID^(nSCID) selected based on the value for n_SCID, the virtual cell identity corresponding to the SPS activation.

5. The UE of claim 4, wherein the n_ID^(nSCID) is configured by signaling on a layer above the physical layer.

6. The UE of claim 1, wherein the PDCCH/EPDCCH corresponding to the associated SPS activation further conveys a value for a PDSCH resource element (RE) mapping quasi co-location indicator (PQI), and wherein the UE is further configured to process the PDSCH based on a transmission parameter set indicated by the value for the PQI.

7. The UE of claim 1, wherein the UE is further configured to process the PDSCH based on a transmission parameter set indicated by a value for a PDSCH resource element (RE) mapping quasi co-location indicator (PQI), wherein the value for the PQI is configured based on RRC layer signaling.

8. User equipment (UE) comprising:

a transceiver component configured to receive a physical downlink control channel or enhanced physical downlink control channel (PDCCH/EPDCCH) transmission associated with a semi-persistent scheduling (SPS) activation, wherein the PDCCH/EPDCCH transmission conveys a value for a physical downlink shared channel (PDSCH) resource element (RE) mapping and quasi co-location indicator (PQI);

a scheduling component configured to schedule reception of an SPS a PDSCH transmission without a corresponding PDCCH/EPDCCH transmission; and

a signal processing component configured to process the PDSCH transmission based on the value for the PQI corresponding to the SPS activation, wherein the PDSCH is received by the transceiver component, and wherein the UE is configured for transmission mode 10 (TM10).

9. The UE of claim 8, wherein TM10 is configured for coordinated multipoint (CoMP) transmission or reception and wherein one or more of the PDSCH and the PDCCH/EPDCCH comprise CoMP transmissions.

10. The UE of claim 8, wherein the UE is configured to monitor a downlink control information (DCI) format and wherein the value for the PQI is conveyed according to DCI format 2D.

11. The UE of claim 8, wherein the PDCCH/EPDCCH further conveys a value for a scrambling identity and wherein the signal processing component processes the PDSCH based on a reference signal sequence initiated using the value for the scrambling identity.

12. The UE of claim 8, further comprising a reference signal component that determines a reference signal sequence based on a scrambling identity and a virtual cell identity, and further comprising a radio resource configuration (RRC) component configured to configure one or more of the scrambling identity and the virtual cell identity using RRC layer signaling.

13. An evolved universal terrestrial radio access network (E-UTRAN) node B (eNB) configured to:

configure user equipment (UE) for coordinated multi-point (CoMP) transmission;

transmit, in a subframe, a semi-persistent scheduling (SPS) activation control channel signal, wherein the SPS activation control channel signal conveys downlink control information (DCI) for the UE to receive signals in the first subframe; and

transmit a shared data channel signal without a corresponding control channel signal based on the DCI corresponding to the SPS activation control channel signal, wherein the shared data channel signal is transmitted in a different subframe.

14. The UE of claim 13, wherein the DCI conveys one or more of a scrambling identity (n_SCID) and a physical downlink shared channel (PDSCH) resource element (RE) mapping and quasi co-location indicator (PQI) based on format 2D and wherein the shared data channel signal is transmitted based on one or more of the n_SCID and the PQI.

15. A mobile wireless device comprising:

a transceiver component configured to receive a scheduled communication on a shared channel without a corresponding control communication on a control channel, wherein the scheduled communication comprises a coordinated multipoint transmission;

an initialization component configured to initialize a pseudo-random sequence based on a scrambling identity, the scrambling identity comprising a predetermined fixed value;

a reference signal component configured to determine a reference signal sequence based on the pseudo-random sequence; and

a signal processing component configured to process a demodulation reference signal corresponding to the scheduled communication based on the determined reference signal sequence.

16. The mobile wireless device of claim 15, wherein initializing the pseudo-random sequence is further based on a cell identifier of a serving cell.

17. The mobile wireless device of claim 15, wherein initializing the pseudo-random sequence is further based on a virtual cell identifier, the virtual cell identifier comprising a predetermined fixed value for scheduled communications.

18. The mobile wireless device of claim 15, wherein the pseudo-random sequence is initialized based on a predetermined virtual cell identifier.

19. The mobile wireless device of claim 15, wherein receiving the scheduled communication comprises receiving based on a parameter set indicator that indicates a transmission parameter set for receiving a signal from a serving transmission point, wherein the parameter set indicator comprises a predetermined fixed value for scheduled communications.

20. The mobile wireless device of claim 15, wherein processing the demodulation reference signal comprises estimating a channel (channel estimation) for the demodulation reference signal and wherein the signal processing component further processes the scheduled communication based on the channel estimation.