Contention free physical uplink shared control channel (PUSCH) transmission using listen before talk
AssigneeApple Inc.
InventorsAbhijeet Bhorkar, Christian Ibars Casas, Seunghee Han
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Abstract
Technology for contention free physical uplink shared control channel (PUSCH) transmission using listen before talk procedure is disclosed. In an example, an apparatus of a user equipment (UE) having circuitry configured to achieves low latency synchronization with an anchor enhanced Node (eNB) by sensing for a predetermined time period if any physical uplink shared channels (PUSCH) are idle with the anchor eNB for uplink (UL) synchronization; providing a unique UE identification in a PUSCH transmission; and communicating the PUSCH transmission in one of the idle PUSCH channels for contention free communication with the anchor eNB for uplink synchronization.
Claims35
An apparatus of a user equipment (UE) operable for low latency synchronization with an enhanced Node B (eNB), the apparatus comprising:
- memory and one or more processors configured to:
- sense for a predetermined time period if any physical uplink shared channels (PUSCH) are idle;
- provide a unique UE identification in a PUSCH transmission;
- communicate the PUSCH transmission in one of the idle PUSCH channels for contention-free communication with the eNB for uplink synchronization without uplink synchronization scheduling;
- use a preamble signal for sensing the PUSCH channels are idle, wherein the preamble signal includes a radio network temporary identifier (RNTI) or a DMRS signal for demodulation;
- sense if a current transmission attempt is unsuccessful, wherein the UE performs a listen before talk procedure consisting of a clear channel assessment (CCA) and an extended clear channel assessment (ECCA) by regenerating a new backoff counter in a next transmission attempt;
- and
- perform the listen before talk procedure starting at symbol 0 for a specified number of symbols M, wherein the PUSCH transmission starts from symbol M+1 and ends at a predetermined symbol within a subframe, wherein M is a positive integer, wherein a sounding reference signal (SRS) is transmitted on the predetermined symbol, and wherein puncturing of the predetermined symbol is eliminated.
An apparatus of an anchored enhanced Node B (eNB) operable to achieve contention free uplink (UL) synchronization with a user equipment (UE), the apparatus comprising:
- one or more processors configured to:
- process a physical uplink shared channel (PUSCH) transmission, received from the UE, following the idle PUSCH channel sensing for a predetermined time period, wherein the PUSCH transmission is received from the UE without UL synchronization scheduling;
- process a unique UE identification in the PUSCH transmission received by the eNB;
- determine an identify of the UE by the unique UE identification in the PUSCH transmission for the contention free UL synchronization;
- and
- process a preamble signal, received from the UE for sensing the PUSCH channels are idle, wherein the preamble signal includes a radio network temporary identifier (RNTI) or a DMRS signal for demodulation;
- wherein the PUSCH transmission starts from symbol M+1 and ends at a predetermined symbol within a subframe, wherein M is a positive integer corresponding to a number of symbols used by the UE for a listen before talk procedure, wherein a sounding reference signal (SRS) is transmitted on the predetermined symbol, wherein puncturing of the predetermined symbol is eliminated.
An apparatus of an anchored enhanced Node B (eNB) operable to perform contention free uplink (UL) synchronization with a user equipment (UE), the apparatus comprising:
- one or more processors configured to:
- process a physical uplink shared channel (PUSCH) transmission, received from the UE, following the idle PUSCH channel sensing for a predetermined time period, wherein the PUSCH transmission is received from the UE without UL synchronization scheduling;
- process a unique UE identification in the PUSCH transmission received by the eNB;
- determine an identify of the UE by the unique UE identification in the PUSCH transmission for the contention free UL synchronization;
- perform a blind UE detection based on a demodulation reference signal;
- and
- process a preamble signal, received from the UE for sensing the PUSCH channels are idle, wherein the preamble signal includes a radio network temporary identifier (RNTI) or a DMRS signal for demodulation;
- wherein the PUSCH transmission starts from symbol M+1 and ends at a predetermined symbol within a subframe, wherein M is a positive integer corresponding to a number of symbols used by the UE for a listen before talk procedure, wherein a sounding reference signal (SRS) is transmitted on the predetermined symbol, wherein puncturing of the predetermined symbol is eliminated.
Dependencies are inferred from the claim text.